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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549



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FORM 20-F



(Mark One)

| ̈ | Registration statement pursuant to Section 12(b) or 12(g) of the Securities Exchange Act of 1934
|- | ------------------------------------------------------------------------------------------------



or



|x | Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
|- | ------------------------------------------------------------------------------------

| | For the fiscal year ended December 31, 2004.
| | --------------------------------------------



or



| ̈ | Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
|- | ----------------------------------------------------------------------------------------



For the transition period from  to



Commission file number 1-15128



United Microelectronics Corporation

(Exact Name of Registrant as Specified in its Charter)



Taiwan, Republic of China

(Jurisdiction of Incorporation or Organization)



No. 3 Li-Hsin Road II, Hsinchu Science Park,

Hsinchu City, Taiwan, ROC

(Address of Principal Executive Offices)



Securities registered or to be registered pursuant to Section 12(b) of the
Act:



|                                         |  |  |  |                                          
|---------------------------------------- |  |  |  | -----------------------------------------
|Title of Each Class                      |  |  |  | Name of Each Exchange on which
Registered
|Common Shares, par value NT$10 per share |  |  |  | New York Stock Exchange                  
|                                         |  |  |  |                                          
|                                         |  |  |  |                                          



Securities registered or to be
registered pursuant to Section 12(g) of the Act:



None

---

(Title of Class)



Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act:



None

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(Title of Class)



Indicate the number of outstanding shares of each of the Issuers classes of capital or common stock as of the close of the period covered by the
annual report.



17,791,981,859 Common Shares of
Registrant issued as of December 31, 2004 (including 241,181,000 treasury shares)

---

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.



Yes x No ̈



Indicate by check mark which financial statement item the
registrant has elected to follow.



Item 17 ̈Item 18 x



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UNITED MICROELECTRONICS CORPORATION



FORM 20-F ANNUAL REPORT

FISCAL YEAR ENDED DECEMBER 31, 2004



Table of Contents



|                                                                     |  |                                                                              |  |     
|-------------------------------------------------------------------- |  | ---------------------------------------------------------------------------- |  | ----
|                                                                     |  |                                                                              |  | Page
|SUPPLEMENTAL INFORMATION                                             |  | 1                                                                           
|                                                                     | 
|FORWARD-LOOKING STATEMENTS IN THIS ANNUAL REPORT MAY NOT BE REALIZED |  | 1                                                                           
|                                                                     | 
|GLOSSARY                                                             |  | 3                                                                           
|                                                                     | 
|PART I                                                               |  | 6                                                                           
|                                                                     |  |                                                                             
|ITEM 1.                                                              |  | IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS                        |  | 6   
|                                                                     |  |                                                                             
|ITEM 2.                                                              |  | OFFER STATISTICS AND EXPECTED TIMETABLE                                      |  | 6   
|                                                                     |  |                                                                             
|ITEM 3.                                                              |  | KEY INFORMATION                                                              |  | 6   
|                                                                     |  |                                                                             
|ITEM 4.                                                              |  | INFORMATION ON THE COMPANY                                                   |  | 23  
|                                                                     |  |                                                                             
|ITEM 5.                                                              |  | OPERATING AND FINANCIAL REVIEW AND PROSPECTS                                 |  | 41  
|                                                                     |  |                                                                             
|ITEM 6.                                                              |  | DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES                                   |  | 59  
|                                                                     |  |                                                                             
|ITEM 7.                                                              |  | MAJOR SHAREHOLDERS AND RELATED PARTY TRANSACTIONS                            |  | 64  
|                                                                     |  |                                                                             
|ITEM 8.                                                              |  | FINANCIAL INFORMATION                                                        |  | 66  
|                                                                     |  |                                                                             
|ITEM 9.                                                              |  | THE OFFER AND LISTING                                                        |  | 67  
|                                                                     |  |                                                                             
|ITEM 10.                                                             |  | ADDITIONAL INFORMATION                                                       |  | 69  
|                                                                     |  |                                                                             
|ITEM 11.                                                             |  | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK                   |  | 85  
|                                                                     |  |                                                                             
|ITEM 12.                                                             |  | DESCRIPTION OF SECURITIES OTHER THAN EQUITY SECURITIES                       |  | 87  
|                                                                     | 
|PART II                                                              |  | 88                                                                          
|                                                                     |  |                                                                             
|ITEM 13.                                                             |  | DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES                              |  | 88  
|                                                                     |  |                                                                             
|ITEM 14.                                                             |  | MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS AND USE OF PROCEEDS |  | 88  
|                                                                     |  |                                                                             
|ITEM 15.                                                             |  | CONTROLS AND PROCEDURES                                                      |  | 88  
|                                                                     |  |                                                                             
|ITEM 16A.                                                            |  | AUDIT COMMITTEE FINANCIAL EXPERT                                             |  | 88  
|                                                                     |  |                                                                             
|ITEM 16B.                                                            |  | CODE OF ETHICS                                                               |  | 88  



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|          |  |                                                                       |  |   
|--------- |  | --------------------------------------------------------------------- |  | --
|ITEM 16C. |  | PRINCIPAL ACCOUNTANT FEES AND SERVICES                                |  | 88
|          |  |                                                                      
|ITEM 16D. |  | EXEMPTIONS FROM THE LISTING STANDARDS FOR AUDIT COMMITTEES            |  | 89
|          |  |                                                                      
|ITEM 16E. |  | PURCHASE OF EQUITY SECURITIES BY THE ISSUER AND AFFILIATED PURCHASERS |  | 89
|          | 
|PART III  |  | 90                                                                   
|          |  |                                                                      
|ITEM 17.  |  | FINANCIAL STATEMENTS                                                  |  | 90
|          |  |                                                                      
|ITEM 18.  |  | FINANCIAL STATEMENTS                                                  |  | 90
|          |  |                                                                      
|ITEM 19.  |  | EXHIBITS                                                              |  | 91



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SUPPLEMENTAL INFORMATION



The
references to United Microelectronics, we, us, our and our company in this annual report refer to United Microelectronics Corporation and its consolidated subsidiaries, unless the context
suggests otherwise. The references to United Semiconductor, United Silicon, United Integrated Circuits, UTEK Semiconductor, UMCJ and UMCi are to United Semiconductor
Corporation, United Silicon Incorporated, United Integrated Circuits Corporation, UTEK Semiconductor Corporation (formerly Holtek Semiconductor), UMC JAPAN (formerly Nippon Foundry Inc.) and UMCi Ltd. (formerly UMCi Pte Ltd), respectively. The
references to Taiwan and ROC refer to Taiwan, Republic of China. The references to shares and common shares refer to our common shares, par value NT$10 per share, and ADSs refers to our
American depositary shares, each representing five common shares. The ADSs are issued under the Deposit Agreement, dated as of September 21, 2000, as amended, supplemented or modified from time to time, among United Microelectronics, Citibank N.A.
and the holders and beneficial owners from time to time of American Depositary Receipts issued thereunder. ROC GAAP means the generally accepted accounting principles of the ROC and US GAAP means the generally accepted
accounting principles of the United States. Any discrepancies in any table between totals and sums of the amounts listed are due to rounding.



We publish our financial statements in New Taiwan dollars, the lawful currency of the ROC. In this annual report, NT$ and NT
dollars mean New Taiwan dollars, $, US$ and U.S. dollars mean United States dollars, ¥ means Japanese Yen, S$ means Singapore dollars and  means Euro.



FORWARD-LOOKING STATEMENTS IN THIS ANNUAL REPORT

MAY NOT BE REALIZED



Our disclosure and analysis in this annual report contain or incorporate by
reference some forward-looking statements. Our forward-looking statements contain information regarding, among other things, our financial condition, future expansion plans and business strategy. We have based these forward-looking statements on our
current expectations and projections about future events. You can identify these statements by the fact that they do not relate strictly to historical or current facts. Although we believe that these expectations and projections are reasonable, such
forward-looking statements are inherently subject to risks, uncertainties and assumptions about us, including, among other things:



| |  |  | our dependence on frequent introduction of new services and technologies based on the latest developments;
| | - |  | ----------------------------------------------------------------------------------------------------------



| |  |  | the intensely competitive semiconductor, PC and communication industries and markets;
| | - |  | -------------------------------------------------------------------------------------



| |  |  | risks associated with international global business activities;
| | - |  | ---------------------------------------------------------------



| |  |  | our dependence on key personnel;
| | - |  | --------------------------------



| |  |  | natural disasters, such as earthquakes and droughts, which are beyond our control;
| | - |  | ----------------------------------------------------------------------------------



| |  |  | general economic and political conditions, including those related to the semiconductor, PC and communication industries;
| | - |  | -------------------------------------------------------------------------------------------------------------------------



| |  |  | possible disruptions in commercial activities caused by natural and human-induced disasters, including terrorist activity, that may reduce end-user purchases relative to
expectations and orders;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | fluctuations in foreign currency exchange rates;
| | - |  | ------------------------------------------------



| |  |  | additional disclosures we make in our previous and future Form 20-F annual reports and Form 6-K periodic reports to the U.S. Securities and Exchange Commission; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | those other risks identified in Item 3. Key InformationD. Risk Factors of this annual report.
| | - |  | ------------------------------------------------------------------------------------------------



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The words anticipate, believe, estimate, expect,
intend, plan and similar expressions, as they relate to us, are intended to identify a number of these forward-looking statements. We undertake no obligation to update or revise any forward-looking statements whether as a
result of new information, future events or otherwise. In light of these risks, uncertainties and assumptions, the forward-looking events discussed in this annual report might not occur and our actual results could differ materially from those
anticipated in these forward-looking statements.



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GLOSSARY



|                         |  |                                                                                                                                                                                                                                                                                                                             
|------------------------ |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|ASIC                     |  | Application Specific Integrated Circuit. A custom-designed integrated circuit that performs specific functions which would otherwise require a number of off-the-shelf integrated circuits to
perform.                                                                                                                      
|                         | 
|BICMOS                   |  | Bipolar CMOS. An integrated circuit fabrication technology that produces both bipolar transistors and CMOS transistors and combines them on one chip.                                                                                                                                                                       
|                         | 
|Cell                     |  | Semiconductor structure in an electrical state which can store a bit of information, mainly used as the building block of memory array.                                                                                                                                                                                     
|                         | 
|CMOS                     |  | Complementary Metal Oxide Silicon, which includes both N-channel and P-channel metal oxide silicon transistors (which are NMOS and PMOS, respectively). Currently the most common used
integrated circuit component.                                                                                                        
|                         | 
|Deep Trench DRAM         |  | Capacitor of DRAM built into a trench etched in the semiconductor substrate. By using a trench configuration, the capacitor can be expanded, increasing its capacity without increasing the
portion of the wafer surface needed for the embedded capacitor.                                                                 
|                         | 
|Die                      |  | A piece of a semiconductor wafer containing the circuitry of an unpackaged single chip.                                                                                                                                                                                                                                     
|                         | 
|DRAM                     |  | Dynamic Random Access Memory. A type of volatile memory product that is used in electronic systems to store data and program instructions. It is the most common type of RAM and must be
refreshed with electricity hundreds of times per second or else it will fade away.                                                 
|                         | 
|Digital signal processor |  | A type of integrated circuit that processes and manipulates digital information after it has been converted from an analog source.                                                                                                                                                                                          
|                         | 
|Flash memory             |  | A type of non-volatile memory that is erasable and reprogrammable. It can be erased and reprogrammed in the electronic system into which the flash memory chip has been
incorporated.                                                                                                                                       
|                         | 
|FSG                      |  | Fluoridated Silicon Glass. Fluorine is added to SiO2,
reducing the dielectric constant of a glass from 3.9 to about 3.5.                                                                                                                                                                                                    
|                         | 
|Integrated circuit       |  | Entire electronic circuit built on a single piece of solid substrate and enclosed in a small package. The package is equipped with leads needed to electrically integrate the integrated
circuit with a larger electronic system. Monolithic and hybrid integrated circuits are distinguished by the type of substrate used.
|                         | 
|Interconnect             |  | The conductive path made from copper or aluminum that is required to achieve connection from one circuit element to the other circuit elements within a circuit.                                                                                                                                                            
|                         | 
|Logic device             |  | A device that contains digital integrated circuits that process, rather than store, information.                                                                                                                                                                                                                            



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|                            |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|--------------------------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Low-k dielectric insulation |  | Insulating material used to separate interconnect wiring layers. A low dielectric constant k is desired in the insulator in order to minimize parasitic capacitance,
which acts as a drag on system performance, or clock speed.                                                                                                                                                                                                                                                                                                                                        
|                            | 
|Mask                        |  | Photomask. A piece of glass on which an integrated circuit circuitry design is laid out.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|                            | 
|Memory                      |  | A group of integrated circuits that a computer uses to store data and programs, such as ROM, RAM, DRAM and SRAM.                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                            | 
|Micron                      |  | A unit of spatial measurement that is one-millionth of a meter.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                            | 
|Nanometer                   |  | A unit of spatial measurement that is one-billionth of a meter.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                            | 
|Nonvolatile memory          |  | Memory products which retain their data content without the need for constant power supply.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|                            | 
|PC                          |  | Personal computer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                            | 
|RAM                         |  | Random Access Memory. A type of volatile memory forming the main memory of a computer where applications and files are run.                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|                            | 
|ROM                         |  | Read-Only Memory. Memory that is programmed by the manufacturer and cannot be changed. Typically, ROM is used to provide start-up data when a computer is first turned on.                                                                                                                                                                                                                                                                                                                                                                                                    
|                            | 
|Scanner                     |  | A photolithography tool used in the production of semiconductor devices. This camera-like step-and-scan tool projects the image of a circuit from a master image onto a photosensitized silicon
wafer.                                                                                                                                                                                                                                                                                                                                                                        
|                            | 
|Semiconductor               |  | A material with electrical conducting properties in between those of metals and insulators. Essentially, semiconductors transmit electricity only under certain circumstances, such as when
given a positive or negative electric charge. Therefore, a semiconductors ability to conduct can be turned on or off by manipulating those charges and this allows the semiconductor to act as an electric switch. The most common semiconductor
material is silicon, used as the base of most semiconductor chips today because it is relatively inexpensive and easy to create.
|                            | 
|SiGe refill process         |  | A technique used to grow Silicon (Si) with Germanium (Ge) doping to increase the compressive strain in PMOS device channel to improve performance.                                                                                                                                                                                                                                                                                                                                                                                                                            
|                            | 
|SoC                         |  | System-on-Chip. A chip that incorporates functions currently performed by several chips on a cost effective basis.                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|                            | 
|SOI                         |  | Silicon-On-Insulator. Silicon wafer consisting of a thin layer of oxide, on top of which semiconductor devices are built.                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                            | 
|SRAM                        |  | Static Random Access Memory. A type of volatile memory product that is used in electronic systems to store data and program instructions. Unlike the more common DRAM, it does not need to be
refreshed.                                                                                                                                                                                                                                                                                                                                                                      



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|                         |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|------------------------ |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Stepper                  |  | A machine used in the photolithography process in making wafers. With a stepper, a small portion of the wafer is aligned with the mask upon which the circuitry design is laid out and is then
exposed to the light source. The machine then steps to the next area repeating the process until the entire wafer has been done.                                                                                                                                        
|                         | 
|Transistor               |  | Tri-terminal semiconductor device in which input signal (voltage or current depending on the type of transistor) controls output current. An individual circuit that can amplify or switch
electric current. This is the building block of all integrated circuits.                                                                                                                                                                                                      
|                         | 
|Volatile memory          |  | Memory products which lose their data content when the power supply is switched off.                                                                                                                                                                                                                                                                                                                                                                                     
|                         | 
|Wafer                    |  | Thin, round, flat piece of silicon that is the base of most integrated circuits.                                                                                                                                                                                                                                                                                                                                                                                         
|                         | 
|8-inch wafer equivalents |  | Standard unit describing the equivalent amount of 8-inch wafers produced after conversion, used to quantify levels of wafer production for purposes of comparison. Figures of 8-inch wafer
equivalents are derived by converting the number of wafers of all dimensions (e.g., 6-inch, 8-inch, 12-inch) into their equivalent figures for 8-inch wafers. 100 6-inch wafers are equivalent to 56.25 8-inch wafers. 100 12-inch wafers are equivalent
to 225 8-inch wafers.



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PART I



|ITEM 1. | IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS
|------- | -----------------------------------------------------



Not applicable.



|ITEM 2. | OFFER STATISTICS AND EXPECTED TIMETABLE
|------- | ---------------------------------------



Not applicable.



|ITEM 3. | KEY INFORMATION
|------- | ---------------



|A. | Selected Financial Data
|-- | -----------------------



The selected balance sheet data as of December 31, 2003 and 2004 and the selected statements of income and cash flow data for the years ended December 31,
2002, 2003 and 2004 are derived from our audited consolidated financial statements included elsewhere in this annual report. The selected balance sheet data as of December 31, 2000, 2001 and 2002 and the selected statements of income and cash flow
data for the year ended December 31, 2000 and 2001 are derived from our audited consolidated financial statements not included in this annual report.



Our financial statements have been prepared and presented in accordance with generally accepted accounting principles in the ROC, or ROC GAAP, which
differ in many material respects from generally accepted accounting principles in the United States, or US GAAP. For a discussion of these differences, see Note 33 to our audited consolidated financial statements included elsewhere in this annual
report. Some of the statements of income, cash flow and balance sheet data items have been reconciled to US GAAP and are set forth below. The summary financial data set forth below should be read in conjunction with Item 5. Operating and
Financial Review and Prospects and our financial statements and the notes to those statements included elsewhere in this annual report.



|                                                      |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|----------------------------------------------------- |  | ------------------------------------------------ | - |  | ------- | - |  | ------- | - |  | ------- | - |  | ------- | - |  | ------ | -
|                                                      |  | Year Ended December 31,                          |  
|                                                      |  | 2000                                             |   |  | 2001    |   |  | 2002    |   |  | 2003    |   |  | 2004    |  
|                                                      |  | NT$                                              |   |  | NT$     |   |  | NT$     |   |  | NT$     |   |  | NT$     |   |  | US$    |  
|                                                      |  | (in millions, except per share and per ADS data) |  
|Consolidated Statement of Income Data:                |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|ROC GAAP                                              |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Net operating revenues                                |  | 115,609                                          |   |  | 69,817  |   |  | 75,425  |   |  | 95,704  |   |  | 129,191 |   |  | 4,070  |  
|Costs of goods sold                                   |  | 57,411                                           |   |  | 60,568  |   |  | 62,887  |   |  | 73,938  |   |  | 92,393  |   |  | 2,911  |  
|                                                      |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Gross profit                                          |  | 58,198                                           |   |  | 9,249   |   |  | 12,538  |   |  | 21,766  |   |  | 36,798  |   |  | 1,159  |  
|                                                      |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Operating expenses:                                   |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Sales and marketing                                   |  | 1,153                                            |   |  | 2,276   |   |  | 1,527   |   |  | 2,171   |   |  | 2,775   |   |  | 87     |  
|General and administrative                            |  | 3,196                                            |   |  | 4,425   |   |  | 3,531   |   |  | 3,996   |   |  | 4,853   |   |  | 153    |  
|Research and development                              |  | 6,306                                            |   |  | 8,960   |   |  | 7,368   |   |  | 5,859   |   |  | 7,364   |   |  | 232    |  
|                                                      |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Total operating expenses                              |  | 10,655                                           |   |  | 15,661  |   |  | 12,426  |   |  | 12,026  |   |  | 14,992  |   |  | 472    |  
|                                                      |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Operating income (loss)                               |  | 47,543                                           |   |  | (6,412  | ) |  | 112     |   |  | 9,740   |   |  | 21,806  |   |  | 687    |  
|Net non-operating income (expenses)                   |  | 4,786                                            |   |  | (154    | ) |  | 6,904   |   |  | 4,956   |   |  | 9,938   |   |  | 313    |  
|                                                      |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Income (loss) before income tax and minority interest |  | 52,329                                           |   |  | (6,566  | ) |  | 7,016   |   |  | 14,696  |   |  | 31,744  |   |  | 1,000  |  
|Income tax (expense) benefit                          |  | 91                                               |   |  | 3,040   |   |  | (271    | ) |  | (980    | ) |  | (374    | ) |  | (12    | )
|Minority interest (income) loss                       |  | (1,640                                           | ) |  | 369     |   |  | 327     |   |  | 304     |   |  | 473     |   |  | 15     |  
|                                                      |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Net income (loss)                                     |  | 50,780                                           |   |  | (3,157  | ) |  | 7,072   |   |  | 14,020  |   |  | 31,843  |   |  | 1,003  |  
|                                                      |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Earnings (loss) per share:(1)                         |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Basic                                                 |  | 3.07                                             |   |  | (0.18   | ) |  | 0.42    |   |  | 0.84    |   |  | 1.89    |   |  | 0.06   |  
|Diluted(2)                                            |  | 3.07                                             |   |  | (0.18   | ) |  | 0.42    |   |  | 0.83    |   |  | 1.86    |   |  | 0.06   |  
|Shares used in earnings (loss) per share calculation: |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Basic                                                 |  | 16,506                                           |   |  | 16,931  |   |  | 16,741  |   |  | 16,644  |   |  | 16,828  |   |  | 16,828 |  
|Diluted(2)                                            |  | 16,506                                           |   |  | 16,931  |   |  | 16,958  |   |  | 17,025  |   |  | 17,095  |   |  | 17,095 |  
|Earnings (loss) per ADS:                              |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Basic                                                 |  | 15.35                                            |   |  | (0.90   | ) |  | 2.10    |   |  | 4.20    |   |  | 9.45    |   |  | 0.30   |  
|Diluted(2)                                            |  | 15.35                                            |   |  | (0.90   | ) |  | 2.10    |   |  | 4.15    |   |  | 9.30    |   |  | 0.29   |  
|US GAAP                                               |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Net operating revenues                                |  | 115,616                                          |   |  | 69,816  |   |  | 75,425  |   |  | 95,704  |   |  | 129,191 |   |  | 4,070  |  
|Costs of goods sold                                   |  | (64,633                                          | ) |  | (65,668 | ) |  | (69,258 | ) |  | (77,473 | ) |  | (96,735 | ) |  | (3,048 | )
|Operating income (loss)                               |  | 28,275                                           |   |  | (24,223 | ) |  | (8,306  | ) |  | 5,559   |   |  | (16,434 | ) |  | (518   | )
|Net income (loss)                                     |  | 27,134                                           |   |  | (23,247 | ) |  | 294     |   |  | 10,476  |   |  | (4,749  | ) |  | (150   | )
|Earnings (loss) per share:(1)                         |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Basic                                                 |  | 1.70                                             |   |  | (1.41   | ) |  | 0.02    |   |  | 0.63    |   |  | (0.28   | ) |  | (0.01  | )
|Diluted(2)                                            |  | 1.70                                             |   |  | (1.41   | ) |  | 0.02    |   |  | 0.62    |   |  | (0.28   | ) |  | (0.01  | )
|Shares used in earnings (loss) per share calculation: |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Basic                                                 |  | 15,928                                           |   |  | 16,481  |   |  | 16,462  |   |  | 16,505  |   |  | 16,773  |   |  | 16,773 |  
|Diluted(2)                                            |  | 15,928                                           |   |  | 16,481  |   |  | 16,545  |   |  | 16,891  |   |  | 17,053  |   |  | 17,053 |  
|Earnings (loss) per ADS:                              |  |                                                  |   |  |         |   |  |         |   |  |         |   |  |         |   |  |        |  
|Basic                                                 |  | 8.50                                             |   |  | (7.05   | ) |  | 0.10    |   |  | 3.15    |   |  | (1.40   | ) |  | (0.05  | )
|Diluted(2)                                            |  | 8.50                                             |   |  | (7.05   | ) |  | 0.10    |   |  | 3.10    |   |  | (1.40   | ) |  | (0.05  | )



6



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##### Table of Contents

|                                                     |  |                                                      |   |  |         |    |  |         |    |  |         |   |  |         |    |  |        |   
|---------------------------------------------------- |  | ---------------------------------------------------- | - |  | ------- | -- |  | ------- | -- |  | ------- | - |  | ------- | -- |  | ------ | --
|                                                     |  | As of December 31,                                   |  
|                                                     |  | 2000                                                 |   |  | 2001    |    |  | 2002    |    |  | 2003    |   |  | 2004    |   
|                                                     |  | NT$                                                  |   |  | NT$     |    |  | NT$     |    |  | NT$     |   |  | NT$     |    |  | US$    |   
|                                                     |  | (in millions)                                        |  
|Consolidated Balance Sheet Data:                     |  |                                                      |   |  |         |    |  |         |    |  |         |   |  |         |    |  |        |   
|ROC GAAP                                             |  |                                                      |   |  |         |    |  |         |    |  |         |   |  |         |    |  |        |   
|Current assets                                       |  | 96,760                                               |   |  | 100,787 |    |  | 110,922 |    |  | 154,322 |   |  | 132,936 |    |  | 4,188  |   
|Long-term investment                                 |  | 39,515                                               |   |  | 40,757  |    |  | 37,800  |    |  | 38,859  |   |  | 32,712  |    |  | 1,031  |   
|Property, plant and equipment                        |  | 163,415                                              |   |  | 169,121 |    |  | 167,077 |    |  | 149,557 |   |  | 192,024 |    |  | 6,050  |   
|Total assets                                         |  | 309,789                                              |   |  | 320,694 |    |  | 327,029 |    |  | 354,514 |   |  | 376,305 |    |  | 11,856 |   
|Current liabilities                                  |  | 42,107                                               |   |  | 34,524  |    |  | 29,147  |    |  | 44,140  |   |  | 36,598  |    |  | 1,153  |   
|Long-term debt (excluding current portion)           |  | 35,534                                               |   |  | 54,695  |    |  | 62,321  |    |  | 60,334  |   |  | 61,288  |    |  | 1,931  |   
|Total liabilities                                    |  | 80,687                                               |   |  | 91,778  |    |  | 93,581  |    |  | 107,203 |   |  | 101,202 |    |  | 3,188  |   
|Stockholders equity                                 |  | 219,948                                              |   |  | 213,322 |    |  | 217,424 |    |  | 232,233 |   |  | 266,374 |    |  | 8,392  |   
|US GAAP                                              |  |                                                      |   |  |         |    |  |         |    |  |         |   |  |         |    |  |        |   
|Cash and cash equivalents                            |  | 60,350                                               |   |  | 57,826  |    |  | 54,219  |    |  | 89,196  |   |  | 55,558  |    |  | 1,750  |   
|Working capital(3)                                   |  | 51,212                                               |   |  | 66,837  |    |  | 72,505  |    |  | 104,556 |   |  | 96,180  |    |  | 3,030  |   
|Total assets                                         |  | 421,738                                              |   |  | 456,879 |    |  | 442,645 |    |  | 486,360 |   |  | 460,322 |    |  | 14,503 |   
|Total liabilities                                    |  | 85,575                                               |   |  | 91,792  |    |  | 92,596  |    |  | 108,925 |   |  | 101,354 |    |  | 3,193  |   
|Stockholders equity                                 |  | 326,985                                              |   |  | 349,492 |    |  | 334,025 |    |  | 362,396 |   |  | 350,358 |    |  | 11,038 |   
|                                                     | 
|                                                     |  | As of December 31,                                   |  
|                                                     |  | 2000                                                 |   |  | 2001    |    |  | 2002    |    |  | 2003    |   |  | 2004    |   
|                                                     |  | NT$                                                  |   |  | NT$     |    |  | NT$     |    |  | NT$     |   |  | NT$     |    |  | US$    |   
|                                                     |  | (in millions, except percentages and per share data) |  
|Other Consolidated Data:                             |  |                                                      |   |  |         |    |  |         |    |  |         |   |  |         |    |  |        |   
|ROC GAAP                                             |  |                                                      |   |  |         |    |  |         |    |  |         |   |  |         |    |  |        |   
|Cash flow:                                           |  |                                                      |   |  |         |    |  |         |    |  |         |   |  |         |    |  |        |   
|Capital expenditure                                  |  | 83,483                                               |   |  | 43,051  |    |  | 35,978  |    |  | 24,820  |   |  | 81,110  |    |  | 2,555  |   
|Cash provided by operating activities                |  | 68,077                                               |   |  | 40,187  |    |  | 30,527  |    |  | 49,625  |   |  | 73,938  |    |  | 2,329  |   
|Cash used in investing activities                    |  | (73,683                                              | ) |  | (43,257 | )  |  | (36,439 | )  |  | (24,114 | ) |  | (83,132 | )  |  | (2,619 | ) 
|Cash provided by financing activities                |  | 41,411                                               |   |  | 18,184  |    |  | 3,162   |    |  | 17,581  |   |  | (6,832  | )  |  | (215   | ) 
|Net increase (decrease) in cash and cash equivalents |  | 35,668                                               |   |  | 14,434  |    |  | (2,002  | )  |  | 43,869  |   |  | (17,390 | )  |  | (548   | ) 
|Gross profit margin                                  |  | 50.3                                                 | % |  | 13.2    | %  |  | 16.6    | %  |  | 22.7    | % |  | 28.5    | %  |  | 28.5   | % 
|Operating profit (loss) margin                       |  | 41.1                                                 | % |  | (9.2    | )% |  | 0.1     | %  |  | 10.2    | % |  | 16.9    | %  |  | 16.9   | % 
|Net profit (loss) margin                             |  | 43.9                                                 | % |  | (4.5    | )% |  | 9.4     | %  |  | 14.6    | % |  | 24.6    | %  |  | 24.6   | % 
|Capacity utilization rate (on an actual basis)       |  | 100.0                                                | % |  | 46.6    | %  |  | 65.2    | %  |  | 84.8    | % |  | 90.8    | %  |  | 90.8   | % 
|Dividends declared per share(4)                      |  | 2.0                                                  |   |  | 1.5     |    |  | 1.5     |    |  | 0.4     |   |  | 0.8     |    |  | 0.025  |   
|US GAAP                                              |  |                                                      |   |  |         |    |  |         |    |  |         |   |  |         |    |  |        |   
|Cash flow:                                           |  |                                                      |   |  |         |    |  |         |    |  |         |   |  |         |    |  |        |   
|Capital expenditure                                  |  | 83,501                                               |   |  | 43,054  |    |  | 36,008  |    |  | 24,827  |   |  | 81,127  |    |  | 2,556  |   
|Cash provided by operating activities                |  | 67,977                                               |   |  | 39,785  |    |  | 30,506  |    |  | 49,543  |   |  | 73,760  |    |  | 2,324  |   
|Cash used in investing activities                    |  | (73,516                                              | ) |  | (60,259 | )  |  | (38,035 | )  |  | (32,923 | ) |  | (99,155 | )  |  | (3,124 | ) 
|Cash provided by financing activities                |  | 41,388                                               |   |  | 18,617  |    |  | 3,162   |    |  | 17,587  |   |  | (6,819  | )  |  | (215   | ) 
|Net increase (decrease) in cash and cash equivalents |  | 35,622                                               |   |  | (2,524  | )  |  | (3,607  | )  |  | 34,977  |   |  | (33,639 | )  |  | (1,060 | ) 
|Gross profit margin                                  |  | 44.1                                                 | % |  | 5.9     | %  |  | 8.2     | %  |  | 19.0    | % |  | 25.1    | %  |  | 25.1   | % 
|Operating (loss) profit margin                       |  | 24.5                                                 | % |  | (34.7   | )% |  | (11.0   | )% |  | 5.8     | % |  | (12.7   | )% |  | (12.7  | )%
|Net (loss) profit margin                             |  | 23.5                                                 | % |  | (33.3   | )% |  | 0.4     | %  |  | 10.9    | % |  | (3.7    | )% |  | (3.7   | )%

---

|(1) | Earnings (loss) per share is calculated by dividing net income by the weighted average number
of shares outstanding during the year.
|--- | ------------------------------------------------------------------------------------------------------------------------------------



|(2) | Diluted securities include convertible bonds and employee stock options.
|--- | ------------------------------------------------------------------------



|(3) | Working capital equals current assets minus current liabilities.
|--- | ----------------------------------------------------------------



|(4) | Dividends declared per share are in connection with earnings and accumulated capital reserve.
|--- | ---------------------------------------------------------------------------------------------



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##### Table of Contents

Currency Translations and Exchange Rates



In portions of this annual report, we have translated New Taiwan dollar amounts into U.S. dollars for the convenience of
readers. The rate we used for the translations was NT$31.74 = US$1.00, which was the noon buying rate announced by the Federal Reserve Bank of New York on December 31, 2004. The translation does not mean that New Taiwan dollars could actually be
converted into U.S. dollars at that rate. The following table shows the noon buying rates for New Taiwan dollars expressed in New Taiwan dollar per US$1.00.



|                       |  |            |  |       |  |       |  |              
|---------------------- |  | ---------- |  | ----- |  | ----- |  | -------------
|                       |  | Average(1) |  | High  |  | Low   |  | At Period-End
|2000                   |  | 31.37      |  | 33.25 |  | 30.35 |  | 33.17        
|2001                   |  | 33.91      |  | 35.13 |  | 32.23 |  | 35.00        
|2002                   |  | 34.53      |  | 35.16 |  | 32.85 |  | 34.70        
|2003                   |  | 34.40      |  | 34.98 |  | 33.72 |  | 33.99        
|2004                   |  | 33.27      |  | 34.16 |  | 31.74 |  | 31.74        
|December               |  | 32.17      |  | 32.49 |  | 31.74 |  | 31.74        
|2005                   |  |            |  |       |  |       |  |              
|January                |  | 31.85      |  | 32.22 |  | 31.65 |  | 31.71        
|February               |  | 31.50      |  | 31.79 |  | 31.06 |  | 31.06        
|March                  |  | 31.11      |  | 31.73 |  | 30.65 |  | 31.46        
|April                  |  | 31.48      |  | 31.70 |  | 31.23 |  | 31.23        
|May                    |  | 31.27      |  | 31.47 |  | 30.98 |  | 31.13        
|June (through June 15) |  | 31.31      |  | 31.48 |  | 31.15 |  | 31.37        



Source: Federal Reserve Statistical
Release, Board of Governors of the Federal Reserve System.

---

|(1) | Determined by averaging the rates on the last business day of each month during the relevant period for annual periods and the rates on each business day for monthly
periods.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|B. | Capitalization and Indebtedness
|-- | -------------------------------



Not applicable.



|C. | Reasons for the Offer and Use of Proceeds
|-- | -----------------------------------------



Not applicable.



|D. | Risk Factors
|-- | ------------



Our business and operations are subject to various risks, many of which are beyond our control. If any of the risks described below actually occurs,
our business, financial condition or results of operations could be seriously harmed.



Risks Related to Our Business and Financial Condition



The seasonality and cyclical nature of the semiconductor industry and periodic overcapacity make us particularly vulnerable to significant and sometimes prolonged economic downturns.



The semiconductor industry has historically been highly cyclical and, at
various times, has experienced significant downturns. Since most of our customers operate in semiconductor-related industries, variations in order levels from our customers can result in volatility in our revenues and earnings. Because our business
is, and will continue to be, largely dependent on the requirements of semiconductor companies for our services, downturns in the semiconductor industry will lead to reduced demand for our services. For example, the semiconductor industry experienced
a period of economic downturn beginning in the fourth quarter of 2000 until early 2003, due to a number of factors including a slowdown in the global economy, overcapacity in the semiconductor industry and a



8



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##### Table of Contents

worldwide inventory adjustment. As a result of the downturn, our net operating revenues for 2001 decreased 39.6% from
2000, our net operating revenues for 2002 increased only slightly by 8.0% from 2001. We incurred a net income of NT$7,072 million for 2002 and a net loss of NT$3,157 million for 2001 compared to a net income of NT$50,780 million for 2000. Although
the semiconductor industry is generally recovering from the downturn since early 2003 and our net operating revenues for 2003 and 2004 were NT$95,704 million and NT$129,191 million (US$4,070 million), respectively, we cannot give any assurance that
the recovery will continue or that any future downturn will not affect our results of operations.



Our net operating revenues are also typically affected by seasonal variations in market conditions that contribute to the fluctuation of the average
selling prices of semiconductor services and products. The seasonal sales trends for semiconductor services and products closely mirror those for consumer electronics and computer sales. We generally experience seasonal lows in the demand for
semiconductor services and products during the second quarter and the beginning of the third quarter of the year, primarily as a result of decreased worldwide production and sales of consumer electronics and computers during such periods, due to
decreased demand for consumer electronics and computers. On the other hand, we generally experience seasonal peaks during the latter part of the third quarter and the fourth quarter of the year, primarily as a result of increased worldwide
production and sales of consumer electronics and computers during such periods due to increased demand for computers from holiday sales. However, we cannot give any assurance that seasonal variations will meet our expectations. Any change in the
general seasonal variations which we cannot anticipate may result in materially adverse effects on our revenues, operations and businesses.



Our operating results fluctuate from quarter to quarter, which makes it difficult to predict our future performance.



Our revenues, expenses and results of operations have varied significantly
in the past and may fluctuate significantly from quarter to quarter in the future due to a number of factors, many of which are beyond our control. Our business and operations have at times in the past been negatively affected by, and are expected
to continue to be subject to the risk of, the following factors:



| |  |  | the seasonality and cyclical nature of both the semiconductor industry and the markets served by our customers;
| | - |  | ---------------------------------------------------------------------------------------------------------------



| |  |  | our customers adjustments in their inventory;
| | - |  | ----------------------------------------------



| |  |  | the loss of a key customer or the postponement of orders from a key customer;
| | - |  | -----------------------------------------------------------------------------



| |  |  | the rescheduling and cancellation of large orders;
| | - |  | --------------------------------------------------



| |  |  | our ability to obtain equipment, raw materials, electricity, water and other required utilities on a timely and economic basis;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------



| |  |  | outbreaks of contagious diseases, including severe acute respiratory syndrome;
| | - |  | ------------------------------------------------------------------------------



| |  |  | environmental events, such as fires and earthquakes, or industrial accidents; and
| | - |  | ---------------------------------------------------------------------------------



| |  |  | technological changes.
| | - |  | ----------------------



Due to the factors noted above and other risks discussed in this section, many of which are beyond our control, you should not rely on quarter-to-quarter
comparisons to predict our future performance. Unfavorable changes in any of the above factors may seriously harm our business, financial condition and results of operations. In addition, our operating results may be below the expectations of public
market analysts and investors in some future periods. In this event, the price of the shares or ADSs may underperform or fall.



9



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##### Table of Contents

A decrease in demand for or selling prices of communication devices, consumer electronics and PCs may decrease the
demand for our services and reduce our margins.



Our
customers generally use the semiconductors produced in our fabs in a wide variety of applications. We derive a significant percentage of our operating revenues from customers who use our manufacturing services to make semiconductors for
communication devices, consumer electronics and PCs. Percentages of our net operating revenues derived from our products used in communication devices, consumer electronics, PC, memory and other applications were 45.9%, 27.7%, 22.0%, 2.5% and 1.9%,
respectively, in 2004. The communications and PC markets experienced a sudden and substantial market downturn and inventory correction beginning in the fourth quarter of 2000 until early 2003. This downturn resulted in a reduced demand for our
services and hence decreased our revenues and earnings. Any significant decrease in the demand for communication devices, consumer electronics or PCs may further decrease the demand for our services. In addition, if the average selling prices of
communication devices, consumer electronics or PCs decline significantly, we will be pressured to further reduce our selling prices, which may reduce our revenues and, therefore, reduce our margins significantly. As demonstrated by the downturn in
demand for high technology products, market conditions can change rapidly, without apparent warning or advance notice. In such instances, our customers will experience inventory buildup and/or difficulties in selling their products and, in turn,
will reduce or cancel orders for wafers from us. While these downturns are to be expected in the semiconductor business, their timing, severity and recovery cannot be predicted accurately or at all. When they occur, our business, profitability and
price of the shares and ADSs are likely to suffer.



Overcapacity in the
semiconductor industry may reduce our revenues, earnings and margins.



The prices that we can charge our customers for our services are significantly related to the overall worldwide supply of integrated circuits and semiconductor products. The overall supply of semiconductor products is
based in part on the capacity of other companies, which is outside of our control. Historically, companies in the semiconductor industry have expanded aggressively during periods of increased demand such as was the case in early 2000. As a result,
periods of overcapacity in the semiconductor industry have frequently followed periods of increased demand. In a period of overcapacity, if we are unable to offset the adverse effects of overcapacity through, among other things, our technology and
product mix, we may have to lower the prices we charge our customers for our services and/or we may have to operate at significantly less than full capacity. Such actions could reduce our margin and weaken our financial condition and results of
operations. Due to the decreased demand for semiconductors in 2001 and 2002, our average capacity utilization rate decreased from 100% in 2000 to 46.6% in 2001 and to 65.2% in 2002. With a general recovery in the worldwide semiconductor industry, we
experienced continued growth in 2003 and 2004 with average capacity utilization rates of 84.8% and 90.8%, respectively. However, we cannot give any assurance that the increase in the demand for foundry services will not lead to over capacity again
in the near future, which could materially adversely affect our revenues, earnings and margins.



Any problem in the semiconductor outsourcing infrastructure can adversely affect our net operating revenues and profitability.



Many of our customers depend on third parties to provide mask tooling, assembly and test services. If these customers cannot
timely obtain these services on reasonable terms, they may not order any foundry services from us. This may significantly reduce our net operating revenues and negatively affect our profitability.



We may be unable to implement new technology as it becomes available, which may result
in our loss of customers and market share.



The
semiconductor industry is developing rapidly and the related technology is constantly evolving. If we do not anticipate the technology evolution and rapidly adopt new and innovative technology, we may not be able to produce sufficiently advanced
products at competitive prices. There is a risk that our competitors may adopt new technology before we do, resulting in our loss of market share. For example, in 2003, we were one of the first foundries to deliver working customer products using
advanced 90-nanometer copper technology. This technology has been in volume production since the second quarter of 2004. We are currently actively developing 65-nanometer and 45-nanometer process technologies to significantly increase the
competitive advantages of our customers. If we are unable on a timely basis to begin offering these products on a competitive basis, we may lose to our competitors providing similar technologies to customers, which may cause our net operating
revenues to decline unless we can replace lost customers with new customers.



10



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##### Table of Contents

If we lose the support of our technology partners, we may be unable to provide leading technology to our customers.



Enhancing our manufacturing process technologies is
critical to our ability to provide services for our customers. We intend to continue to advance our process technologies through internal research and development and alliances with other companies. Although we have an internal research and
development team focused on certain customers developing new semiconductor manufacturing process technologies, we are dependent on our technology partners to advance our portfolio of process technologies. We currently have patent cross-licensing
agreements with several companies, including Agere Systems Inc., or Agere, International Business Machines Corporation, or IBM, and Texas Instruments Incorporated, or Texas Instruments.We also depend upon mask and equipment vendors to supply
our technology development teams with the masks and equipment needed to continuously develop more advanced processing technologies. If we are unable to continue any of our joint development arrangements, patent cross-licensing agreements, research
and development alliances and other agreements, on mutually beneficial economic terms, if we re-evaluate the technological and economic benefits of such relationships, if we are unable to enter into new technology alliances with other leading
semiconductor suppliers, or if we fail to secure masks and equipment from our vendors in a timely manner sufficient to support our ongoing technology development, we may lose important customers because we are unable to continue providing our
customers with leading edge mass-producible process technologies.



If we
cannot compete successfully in our industry, our business may suffer.



The worldwide semiconductor foundry industry is highly competitive. We compete with dedicated foundry service providers such as Taiwan Semiconductor Manufacturing Company Limited, Semiconductor Manufacturing
International (Shanghai) Corporation, and Chartered Semiconductor Manufacturing Ltd., as well as the foundry operation services of some integrated device manufacturers such as IBM and Toshiba Corporation, or Toshiba. Integrated device manufacturers
principally manufacture and sell their own proprietary semiconductor products, but may also offer foundry service. Other competitors such as DongbuAnam Semiconductor, Grace Semiconductor Manufacturing Corp., Silterra Malaysia Sdn. Bhd. and 1st
Silicon (Malaysia) Sdn. Bhd. have initiated efforts to develop substantial new foundry capacity. New entrants in the foundry business are likely to initiate a trend of competitive pricing and create potential overcapacity in legacy technology. Some
of our competitors have greater access to capital and substantially greater production, research and development, marketing and other resources than we do. As a result, these companies may be able to compete more aggressively over a longer period of
time than we can.



The principal elements of competition in the
wafer foundry market include:



| |  |  | technical competence;
| | - |  | ---------------------



| |  |  | time-to-volume production and cycle time;
| | - |  | -----------------------------------------



| |  |  | time-to-market;
| | - |  | ---------------



| |  |  | research and development quality;
| | - |  | ---------------------------------



| |  |  | available capacity;
| | - |  | -------------------



| |  |  | manufacturing yields;
| | - |  | ---------------------



| |  |  | customer service;
| | - |  | -----------------



| |  |  | price;
| | - |  | ------



11



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##### Table of Contents

| |  |  | management expertise; and
| | - |  | -------------------------

| |  |  | strategic alliances.
| | - |  | --------------------



Our ability to compete successfully also depends on factors partially outside of our control, including product availability and industry and general
economic trends. If we cannot compete successfully in our industry, our business may suffer.



If we are unable to continuously improve our manufacturing yields, maintain high capacity utilization and optimize the technology mix of our silicon wafer production, our profit margin may substantially decline.



Our ability to maintain our profitability depends, in
part, on our ability to:



| |  |  | maintain our capacity utilization, that is, the wafer-out quantity of 8-inch wafer equivalents divided by estimated total 8-inch equivalent capacity in a specified period. The
estimated capacity numbers may differ depending upon equipment delivery schedules, pace of migration to more advanced process technologies and other factors affecting production ramp-ups;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | maintain or improve our manufacturing yield, that is, the percentage of usable manufactured devices on a wafer; and
| | - |  | -------------------------------------------------------------------------------------------------------------------



| |  |  | optimize the technology mix of our production, that is, the relative number of wafers manufactured utilizing different process technologies.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------



Our manufacturing yields directly affect our ability to attract and retain
customers, as well as the price of our services. Our capacity utilization affects our operating results because a large percentage of our operating costs are fixed. With the general recovery of the worldwide semiconductor industry, we experienced
continued growth in 2003 and 2004. Our technology mix affects utilization of our equipment and process technologies, which can affect our margins. If we are unable to continuously improve our manufacturing yields, maintain high capacity utilization
or optimize the technology mix of our wafer production, our profit margin may substantially decline.



If we are unable to obtain the financing necessary to fund the substantial capital expenditures we expect to incur, we may not be able to implement our planned growth.



Our business and the nature of our industry require us to make substantial
capital expenditures leading to a high level of fixed costs. We expect to incur significant capital expenditures in connection with our growth plans. These capital expenditures will be made in advance of any additional sales to be generated by new
or upgraded fabs as a result of these expenditures. Given the fixed-cost nature of our business, we have in the past incurred, and may in the future incur, operating losses if our revenues do not adequately offset our capital expenditures.
Additionally, our actual expenditures may exceed our planned expenditures for a variety of reasons, including changes in:



| |  |  | our growth plan;
| | - |  | ----------------



| |  |  | our process technology;
| | - |  | -----------------------



| |  |  | market conditions;
| | - |  | ------------------



| |  |  | interest rates;
| | - |  | ---------------



| |  |  | exchange rate fluctuations; and
| | - |  | -------------------------------



| |  |  | prices of equipment.
| | - |  | --------------------



12



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##### Table of Contents

We cannot assure you that additional financing will be available on satisfactory terms, if at all. If
adequate funds are not available on satisfactory terms, we may be forced to curtail our expansion plans or delay the deployment of our services, which could result in a loss of customers and limit the growth of our business.



We depend on a small number of customers for a significant portion of our net operating
revenues and a loss of some of these customers would result in the loss of a significant portion of our net operating revenues.



We have been largely dependent on a small number of customers for a substantial portion of our business. For 2004, our top ten end customers accounted for
55.1% of our net operating revenues. Our top two customers each accounted for 11% and 10% of our net operating revenues in 2004. We expect that we will continue to be dependent upon a relatively limited number of customers for a significant portion
of our net operating revenues. We cannot assure you that our net operating revenues generated from these customers, individually or in the aggregate, will reach or exceed historical levels in any future period. Loss or cancellation of business from
significant changes in scheduled deliveries to, or decreases in the prices of services sold to, any of these customers could significantly reduce our net operating revenues.



Our customers generally do not place purchase orders far in advance, which makes it difficult for us to predict our future revenues,
adjust production costs and allocate capacity efficiently on a timely basis.



Our customers generally do not place purchase orders far in advance (usually two months before shipment). In addition, due to the cyclical nature of the semiconductor industry, our customers purchase orders have
varied significantly from period to period. As a result, we do not typically operate with any significant backlog. The lack of significant backlog makes it difficult for us to forecast our revenues in future periods. Moreover, our expense levels are
based in part on our expectations of future revenues and we may be unable to adjust costs in a timely manner to compensate for revenue shortfalls. We expect that in the future our net operating revenues in any quarter will continue to be
substantially dependent upon purchase orders received in that quarter.



We face significant risks, and incur substantial costs, in connection with the operation of our new fab in Singapore.



In March 2001, we entered into a foundry venture agreement with EDB Investments Pte Ltd., or EDB Investments, and Infineon Technologies AG, or Infineon,
relating to the formation of UMCi to construct and operate a 12-inch wafer fab in Singapores Pasir Ris Wafer Fab Park. Under the sale and transfer agreements entered in August 2003 and March 2004, we purchased all of the shares of UMCi held by
Infineon and EDB Investments. Through subsequent purchases, UMCi became our wholly owned subsidiary in December 2004. The facilities of UMCi employ advanced process technology of 0.13-micron and 90-nanometer processes. UMCi began volume production
in the first quarter of 2004 and currently has a monthly capacity of 12,000 12-inch wafers, which is equivalent to a monthly capacity of 27,000 8-inch wafers. For operational purposes, all of UMCis operations and assets were transferred to our
Singapore branch Fab 12i on April 1, 2005.



Doing business in
Singapore involves risks related to infrastructure, changes in local laws and economic and political conditions. We have chosen Singapore as the location of the 12-inch fab described above in part to take advantage of economic incentives provided
under the laws and policies of Singapore. Any change in these or other laws or policies or in the political or economic conditions in Singapore or the surrounding region may have an adverse effect on Fab 12is business. In addition, due to the
high cost of raw materials, labor and equipment in operating this new fab, we expect that our operations in Singapore could incur significant cash outflows over the next few years. Once a fab is in operation at acceptable capacity and yield rates,
it can provide significant cash inflows. However, prior to such time, it may incur significant losses due largely to significant depreciation and amortization expenses, which are not expected to be offset by a significant amount of revenues. If Fab
12i fails to achieve sufficient volumes of production at or above acceptable yield rates, or if the cost of production exceeds expectation, Fab 12i could result in substantial loss which may negatively affect our income or loss.



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Our inability to obtain, preserve and defend intellectual property rights could harm our competitive position.



Our ability to compete successfully and achieve
future growth will depend, in part, on our ability to protect our proprietary technology and to secure critical processing technology that we do not own at commercially reasonable terms. We cannot assure you that in the future we will be able to
independently develop, or secure from any third party, the technology required for upgrading our production facilities. Our failure to successfully obtain such technology may seriously harm our competitive position.



Our ability to compete successfully also depends on our ability to operate
without infringing on the proprietary rights of others. We have no means of knowing what patent applications have been filed in the United States until they are granted. The semiconductor industry, because of the complexity of the technology used
and the multitude of patents, copyrights and other overlapping intellectual property rights, is characterized by frequent litigation regarding patent, trade secret and other intellectual property rights. It is common for patent owners to assert
their patents against semiconductor manufacturers. We have received from time to time communications from third parties asserting patents that cover certain of our technologies and alleging infringement of intellectual property rights of others, and
we expect to continue to receive such communications in the future. We do not believe that we are currently infringing on any patent rights. In the event any third party were to make a valid claim against us or our customers, we could be required
to:



| |  |  | seek to acquire licenses to the infringed technology which may not be available on commercially reasonable terms, if at all;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------



| |  |  | discontinue using certain process technologies, which could cause us to stop manufacturing certain semiconductors;
| | - |  | ------------------------------------------------------------------------------------------------------------------



| |  |  | pay substantial monetary damages; or
| | - |  | ------------------------------------



| |  |  | seek to develop non-infringing technologies, which may not be feasible.
| | - |  | -----------------------------------------------------------------------



Any one of these developments could place substantial financial and administrative burdens on us and hinder our business. Litigation, which could result
in substantial costs to us and diversion of our resources, may also be necessary to enforce our patents or other intellectual property rights or to defend us or our customers against claimed infringement of the rights of others. If we fail to obtain
necessary licenses or if litigation relating to patent infringement or other intellectual property matters occurs, it could hurt our reputation as a technology leader in our industry and prevent us from manufacturing particular products or applying
particular technologies, which could reduce opportunities to generate revenues.



Our management is being investigated for violations of ROC securities laws and a breach of fiduciary duty in connection with our alleged involvement in the operation of Hejian Technology (Suzhou) Co., Ltd., a semiconductor
manufacturer in China.



Hejian Technology (Suzhou)
Co., Ltd., Hejian, a semiconductor manufacturer in Suzhou, China, was set up in December 2001. Soon after the establishment of Hejian, there were various rumors that Hejian was set up by us, which we denied immediately because we did not inject any
capital into nor did we transfer any technology to Hejian. Our denials were widely reported in the local press. In addition, in April 2002, the Investment Commission of the Ministry of Economic Affairs of the Republic of China, which is the
government authority in charge of approving investments and technology transfers by Taiwan companies to entities located in China, made inquiries on us regarding Hejian but did not find any violations of laws or regulations by us to that effect.



On February 15, 2005, the Hsinchu District Prosecutors
Office conducted a search of our facilities. We were informed verbally by the prosecutors office at the time of the search (but without any written notice) that such search was necessary for the prosecutors offices investigation
regarding certain allegations of criminal offenses. The materials taken away by the prosecutor from the search revealed that the prosecutor was focusing on the alleged relationship between Hejian and us. We later learned that the major defendants
named by the prosecutor include our Vice Chairman, and the person responsible for the management of Hejian, who is a former employee of our



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company. The prosecutor alleged that the defendants breached their fiduciary duty owed to us and violated ROC securities
laws. Because this incident was widely reported by local news media, several of our shareholders filed a complaint against our Chairman with the Hsinchu District Prosecutors Office.



We were only able to confirm that at least 25 defendants in total, including our Chairman and Vice Chairman, were
investigated by the prosecutor after the prosecutor commenced interrogation in March 2005. The allegation made by the prosecutor is that these defendants collectively moved our companys funds, technology, equipment, customers orders and
labor resources to Hejian without regulatory approval. Although we believe that no such acts were committed by any person, our Chairman and Vice Chairman had been informed in an interrogation in June 2005 by the prosecutor that they were being
investigated for alleged violations of ROC securities laws and a breach of fiduciary duty, asserting that our management has acted against our shareholders interests by offering technical assistance to Hejian.



As of the date of this annual report, no charge had been filed by the
prosecutor against any member of our management, including our Chairman or Vice Chairman. If our Chairman or Vice Chairman were to be found guilty as charged by the court, he will be required by ROC law to resign from our board, which would have a
material adverse effect on our business and operations.



After
the prosecutor instituted his investigation, the ROC Financial Supervisory Commission, or FSC, a regulatory authority that supervises securities, banking, futures, and insurance activities in Taiwan, began their investigation into any violation of
ROC securities laws by us. In April 2005, our Chairman was fined with (1) in the amount of NT$2.4 million by the FSC for our delay in making public disclosure timely (within two days) regarding the information relating to Hejian which was resolved
in our board meeting on March 4, 2005, and (2) in the amount of NT$0.6 million for our failure to disclose the information regarding Hejians verbal promise of a fair return to us in connection with our assistance we had provided to Hejian. As
a result of the imposition of the fines by the FSC, our company was also fined in the amount of NT$30,000 by the Taiwan Stock Exchange for a delay in making public disclosure relating to the same information relating to Hejian that was resolved in
our board meeting on March 4, 2005. Although our Chairman and we have respectively appealed, we cannot assure you that either our Chairman or we would prevail on appeal.



We have been offered a 15% interest in a holding company that owns Hejian, but such investment may not materialize.



ROC law prohibits investment in China by Taiwanese
makers of semiconductors without government approval. In March 2005, upon our request for a fair return in connection with our assistance to Hejian in the past, the Chairman of the holding company of Hejian offered us a 15% interest in the holding
company of Hejian. Immediately after we received the offer, we filed an application with the Investment Commission for their executive guidance and disclosed our receipt of such offer to investors and the public. As of the date of this annual
report, we have not entered into any agreement to formalize the terms and conditions in connection with the transfer of the 15% interest. Pending ROC regulatory approval, we will endeavor to include this 15% interest in our assets, which will then
be reflected on our financial statements. We cannot assure you at present that the ROC government will approve our acceptance of this 15% interest, or if such acceptance is approved by the ROC government, the agreement that formalizes the terms and
conditions will be on the terms that are favorable to us.



If we
lose one or more of our key personnel without adequate replacements, our operations and business will suffer.



Our future success to a large extent depends on the continued service of our Chairman and key executive officers. We do not carry key person insurance on
any of our personnel. If we lose the services of any of our Chairman or key executive officers, it could be difficult to find and integrate replacement personnel in a short period of time, which could harm our operations and the growth of our
business.



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We may have difficulty attracting and retaining skilled employees, who are critical to our future success.



The success of our business depends upon attracting
and retaining experienced executives, engineers and other employees to implement our strategy. The competition for skilled employees is intense. We expect demand for personnel in Taiwan to increase in the future as new wafer fabrication facilities
and other businesses are established in Taiwan. We do not have long-term employment contracts with any of our employees. If we were unable to retain our existing personnel or attract, assimilate and recruit new experienced personnel in the future,
it could seriously disrupt our operations and delay or restrict the growth of our business.



Our transactions with affiliates and shareholders may hurt our profitability and competitive position.



We have provided foundry services to several of our affiliates and shareholders. These transactions were conducted on an arms-length basis. Other
than capacity commitments to our former foundry venture partners, we currently do not provide any preferential treatment to any of these affiliates and shareholders. However, we may in the future reserve or allocate our production capacity to these
companies if there is a shortage of foundry services in the market to enable these companies to maintain their operations and/or to protect our investments in them. This reservation or allocation may reduce our capacity available for our other
customers, which may damage our relationships with other customers and discourage them from using our services. This may hurt our profitability and competitive position.



Investor confidence in us may be adversely impacted if we or our independent registered public accountants are unable to attest to the
effectiveness of our internal control over financial reporting as of December 31, 2006 as required by Section 404 of the Sarbanes-Oxley Act of 2002.



We are subject to the reporting requirements of the Securities and Exchange Commission. The Securities and Exchange Commission, as directed by Section 404
of the U.S. Sarbanes-Oxley Act of 2002, adopted rules requiring U.S. public companies to include a report of management on the companys internal control over financial reporting in its annual report on Form 10-K or Form 20-F, as the case may
be, that contains an assessment by management of the effectiveness of the companys internal control over financial reporting. In addition, the companys independent registered public accountants must attest to and report on
managements assessment of the effectiveness of the companys internal control over financial reporting. These requirements will first apply to our annual report on Form 20-F for the fiscal year ending on December 31, 2006. Our management
may not conclude that our internal controls over financial reporting are effective. Moreover, even if our management does conclude that our internal controls over financial reporting are effective, if the independent accountants are not satisfied
with our internal controls, the level at which our controls are documented, designed, operated or reviewed, or if the independent accountants interpret the requirements, rules or regulations differently from us, they may decline to attest to our
managements assessment or may issue a report that is qualified. Any of these possible outcomes could result in a loss of investor confidence in the reliability of our financial statements, which could negatively impact the market price of our
ADSs.



The differences between ROC and U.S. accounting standards affect
the amount of our net income.



Our financial
statements are prepared under ROC GAAP, which differ in certain significant respects from US GAAP. For example, ROC GAAP does not require the recognition of the market value of our shares distributed as bonuses to our employees in the calculation of
net income. In addition, we have performed impairment test under US GAAP, which was not required to apply to financial statements prior to 2005 under ROC GAAP. As a result, our net income (loss) in 2002, 2003 and 2004 under US GAAP was NT$294
million, NT$10,476 million and NT$(4,749) million (US$(150) million), respectively, as compared to net income under ROC GAAP of NT$7,072 million, NT$14,020 million and NT$31,843 million (US$1,003 million) in 2002, 2003 and 2004, respectively. For a
discussion of these differences, see Note 33 to our audited consolidated financial statements included elsewhere in this annual report.



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Any future outbreak of contagious diseases may materially and adversely affect our business and operations, as well
as our financial condition and results of operations.



Any future outbreak of contagious diseases, such as severe acute respiratory syndrome or avian influenza, may disrupt our ability to adequately staff our business and may generally disrupt our operations. If any of our employees is
suspected of having contracted any contagious disease, we may under certain circumstances be required to quarantine such employees and the affected areas of our premises. As a result, we may have to temporarily suspend part of or all of our
operations. Furthermore, any future outbreak may restrict the level of economic activity in affected regions, including Taiwan, which may also adversely affect our business and prospects. As a result, we cannot assure you that any future outbreak of
contagious diseases would not have a material adverse effect on our financial condition and results of operations.



Risks Relating to Manufacturing



Our manufacturing processes are highly complex, costly and potentially vulnerable to impurities and other disruptions that can significantly increase our costs and
delay product shipments to our customers.



Our
manufacturing processes are highly complex, require advanced and costly equipment and are continuously being modified to improve manufacturing yields and product performance. Impurities or other difficulties in the manufacturing process or defects
with respect to equipment or supporting facilities can lower manufacturing yields, interrupt production or result in losses of products in process. As system complexity has increased and process technology has become more advanced, manufacturing
tolerances have been reduced and requirements for precision have become even more demanding. Although we have been enhancing our manufacturing capabilities and efficiency, from time to time we have experienced production difficulties that have
caused delivery delays and quality control problems, as is common in the semiconductor industry. In the past we have encountered the following problems:



| |  |  | capacity constraints due to changes in product mix or the delayed delivery of equipment critical to our production, including scanners, steppers and chemical stations;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | construction delays during expansions of our clean rooms and other facilities;
| | - |  | ------------------------------------------------------------------------------



| |  |  | difficulties in increasing production at new and existing facilities;
| | - |  | ---------------------------------------------------------------------



| |  |  | difficulties in upgrading or expanding existing facilities;
| | - |  | -----------------------------------------------------------



| |  |  | manufacturing execution system or automatic transportation system failure;
| | - |  | --------------------------------------------------------------------------



| |  |  | changing or upgrading our process technologies; and
| | - |  | ---------------------------------------------------



| |  |  | raw materials shortages and impurities.
| | - |  | ---------------------------------------



We cannot guarantee that we will be able to increase our manufacturing capacity and efficiency in the future to the same extent as in the past.



In addition, the Taiwan government is currently building a
high-speed railway system, which would pass near the Tainan Science Park where our new 12-inch fab, Fab 12A, is located. Trains on this system are expected to begin running as early as late 2005. Once these trains begin running, they would emit
microvibrations that some experts predict could interfere with the operation of lithography equipment used for wafer production in Fab 12A, which is close to the affected area. Although we do not believe that such microvibrations may cause serious
direct harm to our operations, they could cause our yield rates at this fab to decline and our costs of producing 12-inch wafers to increase, which could negatively affect our results of operations.



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We may have difficulty in ramping up production in accordance with our schedule, which could cause delays in
product deliveries and decreases in manufacturing yields.



As is common in the semiconductor industry, we have from time to time experienced difficulties in ramping up production at new or existing facilities or effecting transitions to new manufacturing processes. As a result, we have suffered
delays in product deliveries or reduced manufacturing yields. We may encounter similar difficulties in connection with:



| |  |  | the migration to more advanced process technologies, such as 65- and 45-nanometer process technology;
| | - |  | -----------------------------------------------------------------------------------------------------



| |  |  | the joint development with vendors for more powerful tools (both in production and inspection) needed in the future to meet advanced process technology requirements; and
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the adoption of new materials in our manufacturing processes.
| | - |  | -------------------------------------------------------------



Because we are one of the earliest semiconductor manufacturers in the world to construct 12-inch fabs, we may be subject to risks relating to the
construction, ramping up and operation of these facilities. In addition, we cannot assure you that Pasir Ris Wafer Fab Park, the site of Fab 12i (formerly UMCi), will be able to provide infrastructure, engineering and other supporting staff and raw
material supply comparable to that of the Hsinchu Science Park, where most of our existing fabs are located. In the future, we might face construction delays, interruptions, infrastructure failure and delays in upgrading or expanding existing
facilities, or changing our process technologies, any of which might adversely affect our production schedule. Our failure to follow our production schedule could delay the time required to recover our investments and seriously affect our
profitability.



If we are unable to obtain raw materials and equipment in
a timely manner, our production schedules could be delayed and we may lose customers.



We depend on our suppliers for raw materials. To maintain competitive manufacturing operations, we must obtain from our suppliers, in a timely manner, sufficient quantities of quality materials at acceptable prices.
Although we source our raw materials from several suppliers, a small number of these suppliers account for a substantial amount of our supply of raw materials because of the consistent quality of these suppliers wafers. For example, in 2004,
we purchased a majority of our silicon wafers from three suppliers, Shin-Etsu Handotai Corporation, or Shin-Etsu, MEMC Electronic Materials, Inc. and Formosa Komatsu Silicon Corporation. We do not have long-term contracts with most of our suppliers.
From time to time, our suppliers have extended lead time or limited the supply of required materials to us because of capacity constraints. Consequently, from time to time, we have experienced difficulty in obtaining the quantities of raw materials
we need on a timely basis.



In addition, from time to time we
may reject materials that do not meet our specifications, resulting in declines in output or manufacturing yields. We cannot assure you that we will be able to obtain sufficient quantities of raw materials and other supplies in a timely manner. If
the supply of materials is substantially diminished or if there are significant increases in the costs of raw materials, we may be forced to incur additional costs to acquire sufficient quantities of raw materials to sustain our operations, which
may increase our marginal costs and reduce profitability.



We
also depend on a limited number of manufacturers and vendors that make and maintain the complex equipment we use in our manufacturing processes. We also rely on these manufacturers and vendors to improve our technology to meet our customers
demands as technology improves. In periods of unpredictable and highly diversified market demand, the lead time from order to delivery of this equipment can be as long as six to twelve months. If there are delays in the delivery of equipment or if
there are increases in the cost of equipment, it could cause us to delay our introduction of new manufacturing capacity or technologies and delay product deliveries, which may result in the loss of customers and revenues.



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We may be subject to the risk of loss due to fire because the materials we use in our manufacturing processes are
highly flammable.



We use highly flammable materials
such as silane and hydrogen in our manufacturing processes and may therefore be subject to the risk of loss arising from fires. The risk of fire associated with these materials cannot be completely eliminated. We maintain insurance policies to
reduce losses caused by fire, including business interruption insurance. While we believe that our insurance coverage for damage to our property and business interruption due to fire is consistent with semiconductor industry practice, our insurance
coverage is subject to deductibles and self-insured retention and may not be sufficient to cover all of our potential losses. If any of our fabs were to be damaged or cease operations as a result of a fire, it would temporarily reduce manufacturing
capacity and reduce revenues.



We and many of our customers and suppliers
are vulnerable to natural disasters and other events outside of our control, which may seriously disrupt our operations.



Most of our assets and many of our customers and suppliers are located in the Hsinchu Science Park. We and these customers and suppliers are dependent on
the infrastructure supporting the Park. Our operations and the operations of our customers and suppliers are vulnerable to earthquakes, floods, droughts, power losses and similar events that affect the Hsinchu Science Park. The occurrence of any of
these events could interrupt our services and cause severe damages to wafers in process. For instance, our operations stopped completely for five days in September 1999 largely because of a power outage caused by a severe earthquake. After the
stoppage, we spent several days to ramp up to full operations. Most recently, in November 2004, Taiwan experienced significant earthquakes registering up to 6.7 on the Richter scale. We did not experience any significant damage as a result of these
earthquakes. We cannot guarantee that future earthquakes will not cause material damage to our facilities or property, including work in progress, or cause significant business interruptions. Although we maintain property and business interruption
insurance for such risks, there is no guarantee that future damages or business loss from earthquakes will be covered by such insurance, that we will be able to collect from our insurance carriers, should we choose to claim under our insurance
policies, or that such coverage will be sufficient. In addition, shortages or suspension of power supplies to the Hsinchu Science Park have occasionally occurred, and have disrupted our operations. In addition, the Hsinchu area experienced a severe
drought in 2001 and is likely to experience other droughts in the future. While the semiconductor manufacturing process uses large amounts of water, if a drought does occur and the authorities are unable to source water from alternative sources in
sufficient quantity, we may be required to temporarily shut down or substantially reduce the operations of our fabs located in the Hsinchu Science Park, which would seriously affect our operations.



If we violate environmental regulations, our operations may be delayed or interrupted
and our business could suffer.



We are always subject
to environmental regulations and a failure or a claim that we have failed to comply with these environmental regulations could cause delays in our production and capacity expansion and affect our public image, either of which could harm our
business. In addition, as environmental regulations are becoming more comprehensive and stringent, we may incur a greater amount of capital expenditures in technology innovation and materials substitution in order to comply with such regulations,
which may adversely affect our results of operations.



Political, Economic
and Regulatory Risks



We face substantial political risks associated
with doing business in Taiwan, particularly due to the tense relationship between the ROC and the PRC that could negatively affect the value of your investment.



Our principal executive offices and most of our assets and operations are located in Taiwan. Accordingly, our business,
financial condition and results of operations and the market price of our common shares and the ADSs may be affected by changes in ROC governmental policies, taxation, inflation or interest rates and by social instability and diplomatic and social
developments in or affecting Taiwan which are outside of our control. Taiwan has a unique international political status. Since 1949, Taiwan and the Chinese mainland have been separately governed. The PRC claims that it is the sole government in
China and that Taiwan is part of China. Although significant economic and cultural relations have been established during recent years between the ROC and the



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PRC, relations have often been strained. The PRC government has refused to renounce the use of military force to gain control over Taiwan. Furthermore, the
PRC government passed an Anti-Secession Law in March 2005, which authorizes non-peaceful means and other necessary measures should Taiwan move to gain independence from the PRC. Past developments in relations between the ROC and the PRC have on
occasion depressed the market prices of the securities of companies in the ROC. Relations between the ROC and the PRC and other factors affecting military, political or economic conditions in Taiwan could materially and adversely affect our
financial condition and results of operations, as well as the market price and the liquidity of our securities.



Our business depends on the support of the ROC government, and a decrease in this support may increase our labor costs and decrease our net income after tax.



The ROC government has been very supportive of
technology companies such as us. For instance, the ROCs labor laws and regulations do not require employees of semiconductor companies, including our company, to be unionized, and permit these employees to work shifts of 10 hours each day on a
two-days-on, two-days-off basis. We cannot assure you, however, that these labor laws and regulations will not change in the future. In the event that the ROC government requires our employees to be unionized or decreases the number of hours our
employees may work in a given day, our labor costs may increase significantly which could result in lower margins.



We, like many ROC technology companies, have benefited from substantial tax incentives provided by the ROC government. In 2004, such incentives resulted
in a tax credit in the amount of NT$4,388 million (US$138 million). If these incentives are curtailed or eliminated, our net income after tax may decrease substantially.



The trading price of the shares and ADSs may be adversely affected by the general activities of the Taiwan Stock Exchange and U.S.
stock exchanges, the trading price of our shares, increases in interest rates and the economic performance of Taiwan.



Our shares are listed on the Taiwan Stock Exchange. The trading price of our ADSs may be affected by the trading price of our shares on the Taiwan Stock
Exchange and the economic performance of Taiwan. The Taiwan Stock Exchange is smaller and, as a market, more volatile than the securities markets in the United States and a number of European countries. The Taiwan Stock Exchange has experienced
substantial fluctuations in the prices and volumes of sales of listed securities, and there are currently limits on the range of daily price movements on the Taiwan Stock Exchange. In the past 15 years, the Taiwan Stock Exchange Index peaked at
10,393.59 in February 2000 and subsequently fell to a low of 3,411.68 in September 2001. During 2004, the Taiwan Stock Exchange Index peaked at 7,034.10 on March 4, 2004 and reached a low of 5,316.87 on August 4, 2004. On May 31, 2005, the Taiwan
Stock Exchange Index closed at 6,011.56, and the daily closing value of our shares was NT$21.20 per share. The Taiwan Stock Exchange is particularly volatile during times of political instability, such as when relations between Taiwan and the PRC
are strained. Moreover, the Taiwan Stock Exchange has experienced problems such as market manipulation, insider trading and payment defaults, and the government of Taiwan has from time to time intervened in the stock market by purchasing stocks
listed on the Taiwan Stock Exchange. The recurrence of these or similar problems could decrease the market price and liquidity of the shares and ADSs.



From September 19, 2000, the commencement date of the listing of our ADSs on the New York Stock Exchange, or NYSE, to May 31, 2005, daily reported closing
prices of our ADSs ranged from US$10.07 per ADS to US$2.65 per ADS. The market price of the ADSs may also be affected by general trading activities on the U.S. stock exchanges, which recently have experienced significant price volatility with
respect to shares of technology companies. Fluctuation in interest rates and other general economic conditions may also have an effect on the market price of the ADSs.



Currency fluctuations could increase our costs relative to our revenues, which could adversely affect our profitability.



More than half of our net operating revenues are
denominated in currencies other than New Taiwan dollars, primarily U.S. dollars and Japanese Yen. On the other hand, more than half of our costs of direct labor, raw materials and overhead are incurred in New Taiwan dollars. Although we hedge a
portion of the resulting net foreign exchange position through the use of forward exchange contracts, we are still affected by fluctuations in exchange rates among the U.S. dollar, the Japanese Yen, the New Taiwan dollar and other currencies. Any
significant



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fluctuation in exchange rates may be harmful to our financial condition. In addition, fluctuations in the exchange rate between the U.S. dollar and the New
Taiwan dollar will affect the U.S. dollar value of the ADSs and the U.S. dollar value of any cash dividends we pay, which could have a corresponding effect on the market price of the ADSs.



Risks Related to the Shares and ADSs and Our Trading Markets



Restrictions on the ability to deposit shares into our ADS program may adversely
affect the liquidity and price of the ADSs.



The
ability to deposit shares into our ADS program is restricted by ROC law. Under current ROC law, no person or entity, including you and us, may deposit shares into our ADS program without specific approval of the ROC Securities and Futures Bureau, or
ROC SFB, except for the deposit of the shares into our ADS program and for the issuance of additional ADSs in connection with:



| |  |  | distribution of share dividends or free distribution of our shares;
| | - |  | -------------------------------------------------------------------



| |  |  | exercise of the preemptive rights of ADS holders applicable to the shares evidenced by ADSs in the event of capital increases for cash; or
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | if permitted under the deposit agreement and the custody agreement, purchases of our shares in the domestic market in Taiwan by the investor directly or through the depositary or
the surrender of shares under the possession of investors and then delivery of such shares to the custodian for deposit into our ADS program, subject to the following conditions: (a) the depositary may accept deposit of those shares and issue the
corresponding number of ADSs with regard to such deposit only if the total number of ADSs outstanding after the deposit does not exceed the number of ADSs previously approved by ROC SFB, plus any ADSs issued pursuant to the events described above;
and (b) this deposit may only be made to the extent previously issued ADSs have been withdrawn.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



As a result of the limited ability to deposit shares into our ADS program, the prevailing market price of our ADSs on the NYSE may differ from the
prevailing market price of the equivalent number of our shares on the Taiwan Stock Exchange.



Holders of our ADSs will not have the same voting rights as the holders of our shares, which may affect the value of your investment.



Due to the amendment to the Company Act and the amendment made to our articles of incorporation accordingly, except for
treasury shares, each common share is generally entitled to one vote and no voting discount will be applied. However, except as described in this annual report and in the deposit agreement, holders of our ADSs will not be able to exercise voting
rights attaching to the shares evidenced by our ADSs on an individual basis. Holders of our ADSs will appoint the depositary or its nominee as their representative to exercise the voting rights attaching to the shares represented by the ADSs. The
voting rights attaching to the shares evidenced by our ADSs must be exercised as to all matters brought to a vote of shareholders collectively in the same manner.



If holders of at least 51% of the ADSs outstanding at the relevant record date instruct the depositary to vote in the same
manner regarding a resolution, including election of directors and/or supervisors, the depositary will appoint our Chairman, or his designee, to represent the ADS holders at the shareholders meetings and to vote the shares represented by the
ADSs outstanding in the manner so instructed. If by the relevant record date the depositary has not received instructions from holders of ADSs holding at least 51% of the ADSs to vote in the same manner for any resolution, then the holders will be
deemed to have instructed the depositary to authorize and appoint our Chairman, or his designee, to vote all the shares represented by ADSs at his sole discretion, which may not be in your interest.



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The rights of holders of our ADSs to participate in our rights offerings may be limited, which may cause dilution
to their holdings.



We may from time to time
distribute rights to our shareholders, including rights to acquire our securities. Under the deposit agreement, the depositary will not offer those rights to ADS holders unless both the rights and the underlying securities to be distributed to ADS
holders are either registered under the Securities Act or exempt from registration under the Securities Act. We are under no obligation to file a registration statement with respect to any such rights or underlying securities or to endeavor to cause
such a registration statement to be declared effective. Accordingly, holders of our ADSs may be unable to participate in our rights offerings and may experience dilution in their holdings.



Our public shareholders may have more difficulty protecting their interests than they
would as shareholders of a U.S. corporation.



Our
corporate affairs are governed by our articles of incorporation and by laws governing ROC corporations. The rights of our shareholders to bring shareholders suits against us or our board of directors under ROC law are much more limited than
those of the shareholders of U.S. corporations. Therefore, our public shareholders may have more difficulty protecting their interests in connection with actions taken by our management, members of our board of directors or controlling shareholders
than they would as shareholders of a U.S. corporation. Please refer to Item 10. Additional InformationB. Memorandum and Articles of AssociationRights to Bring Shareholders Suits included elsewhere in this annual report
for a detailed discussion of the rights of our shareholders to bring legal actions against us or our directors under ROC law.



Holders of our ADSs will be required to appoint several local agents in Taiwan if they withdraw shares from our ADS program and become our shareholders, which may
make ownership burdensome.



Non-ROC persons wishing to
withdraw shares represented by their ADSs from our ADS program and hold our shares represented by those ADSs are required to, among other things, appoint a local agent or representative with qualifications set forth by the ROC SFB to open a
securities trading account with a local brokerage firm, pay ROC taxes, remit funds and exercise shareholders rights. In addition, the withdrawing holders are also required to appoint a custodian bank with qualifications set forth by the
Ministry of Finance to hold the securities in safekeeping, make confirmations, settle trades and report all relevant information. Without making this appointment and opening of the accounts, the withdrawing holders would not be able to subsequently
sell our shares withdrawn from a depositary receipt facility on the Taiwan Stock Exchange. Under ROC law and regulations, citizens of the PRC are not permitted to hold our shares or withdraw shares represented by ADSs from our ADS program unless
they obtain the approval from the competent authority. Due to the absence of relevant rules or guidelines, PRC persons are currently not able to conduct investments in the ROC.



You may not be able to enforce a judgment of a foreign court in the ROC



We are a company limited by shares incorporated under the ROC Company Act.
Most of our assets and most of our directors, supervisors and executive officers and experts named in the registration statement are located in Taiwan. As a result, it may be difficult for you to enforce judgments obtained outside Taiwan upon us or
such persons in Taiwan. We have been advised by our ROC counsel that any judgment obtained against us in any court outside the ROC arising out of or relating to the ADSs will not be enforced by ROC courts if any of the following situations shall
apply to such final judgment:



| |  |  | the court rendering the judgment does not have jurisdiction over the subject matter according to ROC law;
| | - |  | ---------------------------------------------------------------------------------------------------------



| |  |  | the judgment is contrary to the public order or good morals of the ROC;
| | - |  | -----------------------------------------------------------------------



| |  |  | the judgment was rendered by default, except where the summons or order necessary for the commencement of the action was legally served on us within the jurisdiction of the court
rendering the judgment within a reasonable period of time or with judicial assistance of the ROC; or
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | judgments of ROC courts are not recognized and enforceable in the jurisdiction of the court rendering the judgment on a reciprocal basis.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------



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|ITEM 4. | INFORMATION ON THE COMPANY
|------- | --------------------------



|A. | History and Development of the Company
|-- | --------------------------------------



Our legal and commercial name is United Microelectronics Corporation, commonly known as UMC. We were incorporated under the ROC Company Law as
a company limited by shares in May 1980 and our shares were listed on the Taiwan Stock Exchange in 1985. Our principal executive office is located at No. 3 Li-Hsin Road II, Hsinchu Science Park, Hsinchu, Taiwan, Republic of China, and our telephone
number is 886-3-578-2258. Our Internet website address is www.umc.com. The information on our website does not form part of this annual report. Our ADSs have been listed on the NYSE under the symbol UMC since September 19, 2000.



We are one of the worlds largest independent
semiconductor foundries and a leader in semiconductor manufacturing process technologies. Our primary business is the manufacture, or fabrication, of semiconductors, sometimes called chips or integrated circuits,
for others. Using our own proprietary processes and techniques, we make chips to the design specifications of our many customers. Our company maintains a diversified customer base across industries, including communication devices, consumer
electronics, computer and memory, while continuing to focus on manufacturing for high growth, large volume applications, including networking, telecommunications, Internet, multimedia, PCs and graphics. We sell and market mainly wafers which in turn
are used in a number of different applications by our customers. Percentages of our net operating revenues derived from our products used in communication devices, consumer electronics, PC, memory and other applications were 45.9%, 27.7%, 22.0%,
2.5% and 1.9%, respectively, in 2004.



We focus on the
development of leading mass-producible manufacturing process technologies. We were among the first in the foundry industry to go into commercial operation with such advanced capabilities as producing integrated circuits with line widths of 0.25,
0.18, 0.15 and 0.13 micron. Moreover, we have developed our own 90-nanometer copper technology with both FSG and low-k dielectric insulation as well as copper metal wiring layers. In 2003, we were one of the first foundries to deliver working
customer products using advanced 90-nanometer copper technology. This technology has been in volume production since the second quarter of 2004 after passing several full-product certifications, including various reliability, burn-in and packaging
criteria. Our 0.18 micron and more advanced technologies have contributed to approximately 54.2% of our total net operating revenues in 2004, compared to 41.1% in 2003. We believe such technologies will better serve the needs of advanced customer
chip designs with high performance and low power consumption. Our research and development team currently focuses on the development of 65-nanometer process technology and has dedicated resources to the research of 45-nanometer process technology.
Areas of research topics include strained silicon devices, 3-dimensional transistors, SOI, advanced modules such as high-k dielectric insulation and metal gate, raised source and drain, SiGe refill process, nickel silicide, advanced metal
interconnect schemes and advanced optical proximity correction. We believe our superior process technologies will enable us to continue to offer our customers significant performance benefits for their products, faster time-to-market production,
reasonable cost and other competitive advantages.



We provide
high quality service based on our performance. We address our customers needs using our advanced technology and proven methodology to achieve fast cycle time, high yield, production flexibility and close customer communication. For example, we
select and configure our clean rooms and equipment, and develop our processes, to maximize flexibility in meeting and adapting to rapidly changing customer and industry needs. As a result, our cycle time, or the period from customer order to wafer
delivery, and our responsiveness to customer request changes are among the fastest in the dedicated foundry industry. Our design service team actively cooperates with the customers and vendors of cell libraries and intellectual property offerings to
identify early in the product cycle the offerings needed by our customers and to ensure that these coordinated offerings are available to our customers in silicon verified form in a streamlined and easy to utilize manner. This enables a timely
delivery of service offerings from the earliest time in the customer design cycle, resulting in shorter time-to-volume production. We also provide high quality service and engineering infrastructure. We provide our customers with real-time Internet
access to their confidential production data, resulting in superior communication and efficiency.



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Our production capacity is comparable to that of the largest companies in the semiconductor industry, and
we believe our leading edge and high volume capability is a major competitive advantage. We have expanded our operations in Taiwan over the past several years. In 2002, we began volume production of 12-inch wafers at Fab 12A, our new 12-inch fab in
Taiwan. As of March 31, 2005, Fab 12A had a monthly capacity of 22,000 12-inch wafers, equivalent to a monthly capacity of 49,500 8-inch wafers. We also have a controlling interest in UMCJ, formerly known as Nippon Foundry Inc., the first dedicated
foundry in Japan, which owns one 8-inch fab in Japan. Our interest in UMCJ gives our company proximity to some of the largest integrated device manufacturers in the world, such as Sony Corporation, or Sony, and allows our company to offer them local
outsourcing of semiconductor production. In December 2004, UMCi, which operates a 12-inch fab in Singapores Pasir Ris Wafer Fab Park, became our wholly-owned subsidiary. The facilities of UMCi employ advanced process technologies including
0.13-micron and 90-nanometer processes. UMCi began volume production in the first quarter of 2004 and currently has a monthly capacity of 12,000 12-inch wafers, which is equivalent to a monthly capacity of 27,000 8-inch wafers. For operational
purposes, all of UMCis operations and assets were transferred to our Singapore branch Fab 12i on April 1, 2005.



Our technology and service have attracted three dominant types of foundry industry customers: fabless design companies, integrated device manufacturers
and system companies. Fabless design companies design, develop and distribute proprietary semiconductor products, but do not maintain internal manufacturing capacity. Instead, these companies depend on outside manufacturing sources. Integrated
device manufacturers, in contrast, traditionally integrated all functions  manufacturing as well as design, development, sales and distribution. System companies design and develop integrated circuits to be components within their end or
intermediate products and generally do not maintain internal manufacturing capacity. For example, system companies market and sell cellular telephones and/or Internet appliances into which they incorporate semiconductor products.



Our primary end customers, in terms of our sales revenues, include premier
integrated device manufacturers, such as Advanced Micro Devices, Inc., or AMD, Infineon, LSI Logic Corp., Philips Semiconductors, or Philips, Sony, STMicroelectronics Inc., or STMicroelectronics, and Texas Instruments, and leading fabless design
companies, such as ATI Technologies Inc., or ATI, Conexant Systems Inc., or Conexant Systems, MediaTek Corp., or MediaTek, Novatek Microelectronics Corp. Ltd., or Novatek, Qualcomm Incorporated, or Qualcomm, Realtek Semiconductor Corp., or Realtek,
and Xilinx. For 2004, our companys top ten end-customers accounted for 55.1% of our net operating revenues. We believe our success in attracting these end customers is a direct result of our commitment to high quality service and our intense
focus on customer needs and performance.



Please refer to
Item 5. Operating and Financial Review and Prospectus B. Liquidity and Capital Resources for a discussion of our capital expenditures in the past three years and the plan for the current year.



Our Strategy



To maintain and enhance our position as a market leader, we have adopted a business strategy with a focus on a partnership
business model designed to accommodate our customers business objectives and needs and to promote their interests as our partners. We believe that our success and profitability are inseparable from the success of our customers. The goal in
this business model is to create a network of partnerships or alliances among system and integrated device manufacturers, intellectual property and design houses, as well as foundry companies. We believe that our partners and we will benefit from
the synergy generated through such long-term partnerships or alliances and the added value to be shared among the partners. The key elements of our strategy are:



Build up Customer-focused Partnership Business Model. We focus on building partnership relationships with our
customers, and we strive to help our customers achieve their objectives through intimate cooperation. Unlike the traditional buy-and-sell relationship between a foundry and its customer, we believe our partnership business model will help us
understand our customers requirements and, accordingly, better accommodate our customers needs in a number of ways, such as customized processing and services that optimize the entire value chain (not just the foundry portion) and
intellectual property-related support. We believe that this business model will enable us to deliver our products to our customers at the earliest time our customers require for their design cycle, resulting in shorter time-to-market and
time-to-volume production. Furthermore, we believe we will render more cost-effective services by focusing our research and development expenditures on the specific requirements of our customers. We believe our partnership business model will help
us not only survive a market downturn, but also achieve a better competitive position.



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Continue to Focus on High Growth Applications and Customers.We believe one measure of a
successful foundry company is the quality of its customers. We focus our sales and marketing on customers who are established or emerging leaders in industries with high growth potential. Our customers include industry leaders such as AMD, ATI,
Infineon, MediaTek, Oki, Qualcomm, Realtek, SanDisk Corporation, or SanDisk, Sharp Microelectronics of the Americans, or Sharp, Sony, STMicroelectronics, Texas Instruments and Xilinx. We seek to maintain and expand our relationships with
these companies. We strive to demonstrate to these customers the superiority and flexibility of our manufacturing, technology and service capabilities and to provide them with production and design assistance. We are also making efforts to further
diversify our customer portfolio by actively pursuing customers in the PC-related area in order to maintain a balanced exposure to different applications. We believe these efforts strengthen our relationships with our customers and enhance our
reputation in the semiconductor industry as a leading foundry service provider.



Maintain Our Leading Position in Mass-Producible Semiconductor Technology and Selectively Pursue Strategic Investments in New Technologies. We believe that maintaining and enhancing our leadership in
mass-producible semiconductor manufacturing technologies is critical to attract and retain customers. Our reputation for technological excellence has attracted both established and emerging leaders in the semiconductor industries who work closely
with us on technology development. In addition, we believe our superior processing expertise has enabled us to provide flexible production schedules to meet our customers particular needs. We plan to continue building internal research and
development expertise, to focus on process development and to establish alliances with leading semiconductor companies to accelerate access to next-generation technologies. We pioneered the use of copper interconnect metallurgies for the dedicated
foundry industry. These copper interconnect metallurgies allow higher conductivity and lower power consumption than traditional aluminum interconnects. In 2002, we began volume production using our advanced 0.13-micron technology. Our extensive
experience in the 0.13-micron process technology has helped smooth our transition to 90-nanometer production. Many of the materials and techniques, including copper interconnects and low-k dielectric materials, that were first used in connection
with the 0.13-micron process technology also apply to the 90-nanometer copper technology. Our 90-nanometer copper technology marks further advance in our technology achievements, incorporating up to nine copper metal layers, triple gate oxide and
other advanced features. In 2003, we were one of the first foundries to deliver working customer products using advanced 90-nanometer copper technology. This technology has been in volume production since the second quarter of 2004. We believe our
progress in the development of 90-nanometer copper technology will benefit our customers in the fields of computers, communications, consumer electronics and others with special preferences in certain aspects of the products, such as the ultimate
performance, density and power consumption.



We also recognize
every company has limited resources and that the foundry industry is ever-evolving. Accordingly, we believe we should invest in new research and development technology intelligently and in a cost-effective manner to achieve the ultimate output of
the resulting technology. In doing so, we balance the rate of return of our research and development with the importance of developing a technology at the right time to enhance our competitive edge without unduly diluting our profitability. We
intend to avoid investments in technologies that do not present a commercial potential for volume production. We believe that to develop the earliest and most advanced semiconductor technology without regard to its potential for near term volume
production may prove costly to our operations and would not strengthen our competitive position. We perceive a benefit to defer investment in the premature equipment needed to claim the earliest advanced technology and instead to purchase a more
advanced and less expensive version of equipment from vendors who design such equipment based on pre-production lessons learned from the earliest technology.



Maintain Scale and Capacity Capabilities to Meet Customer Requirements, with a Focus on 12-inch Wafer Facilities for Future Expansion. We
believe that maintaining our foundry capacity with advanced technology and facilities is critical to the maintenance of our industry leadership. Our production capacity is currently among the largest of all semiconductor foundries in the world. We
intend to increase our 12-inch wafer production capacity to meet the needs of our customers and to fully capitalize on the expected growth of our industry. Our future capacity expansion plans will focus on 12-inch wafer facilities in order to
maintain our technology leadership. 12-inch wafers offer manufacturing advantages over 8-inch wafers because of the greater number of chips on each wafer. In



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addition, 12-inch wafer facilities present a more cost-effective solution in achieving an economic scale of production. We intend to carefully monitor
current market conditions in order to optimize the timing of our capital spending. In 2002, we began volume production at Fab 12A, in Tainan, Taiwan. In addition, UMCi, which operates a 12-inch fab in Singapores Pasir Ris Wafer Fab Park, began
its volume production in the first quarter of 2004, employing advanced process technologies including 0.13-micron and 90-nanometer processes. We are currently evaluating opportunities to expand our wafer fabrication business into the PRC. Our
initial budget for purchases of semiconductor manufacturing equipment for 2005 is approximately US$1 to 1.5 billion. Our efforts in increasing our production capacity raised our total production capacity from approximately 257,000 8-inch wafer
equivalents per month in December 2002 to approximately 355,000 8-inch wafer equivalents per month in December 2004. Our annual total production capacity reached 3,528,000 8-inch wafer equivalents in 2004.



Operate as a SoC Solution Foundry. We plan to operate as a SoC
solution foundry. This plan involves collaborating closely with customers as well as partners throughout the entire SoC technology supply chain, including equipment, Electronic Design Automation tool and IP vendors, to work synergistically towards
SoC solutions for each customer. Our implementation of the plan has resulted in a broad range of options available to SoC designers, including silicon-validated reference flows, in-depth IP portfolio and know-how and extensive libraries of IPs, to
better provide value to their customers. Capitalizing on our advanced process technology, extensive package and test capabilities and state-of-art 300mm manufacturing facilities, we believe we are in a better position to deliver integrated SoC
solutions for customers than most of our competitors.



|B. | Business Overview
|-- | -----------------



Manufacturing Facilities



To maintain a leading position in the foundry business, we have placed great emphasis on achieving and maintaining a high standard of manufacturing quality. As a result, we seek to design and implement manufacturing processes that produce
consistent, high manufacturing yields to enable our customers to estimate, with reasonable certainty, how many wafers they need to order from us. In addition, we continuously seek to enhance our production capacity and process technology, two
important factors that characterize a foundrys manufacturing capability. Our large production capacity and advanced process technologies enable us to provide our customers with volume production and flexible and quick-to-market manufacturing
services. All of our fabs operate 24 hours per day, seven days per week. Substantially all maintenance at each of the fabs is performed concurrently with production.



The following table sets forth operational data of each of our manufacturing facilities as of December 31, 2004.



|                                  |  |                            |  |                                                                             |  |                             |  |                                      |  |                                      |  |                                       |  |                                       |  |                                       |  |                             |  |                                      
|--------------------------------- |  | -------------------------- |  | --------------------------------------------------------------------------- |  | --------------------------- |  | ------------------------------------ |  | ------------------------------------ |  | ------------------------------------- |  | ------------------------------------- |  | ------------------------------------- |  | --------------------------- |  | -------------------------------------
|                                  |  | Fab 6A                     |  | Fab 8AB                                                                     |  | Fab 8C                      |  | Fab 8D                               |  | Fab 8E                               |  | Fab 8F                                |  | Fab 8S(5)                             |  | Fab 12A                               |  | UMCJ                        |  | UMCi(6)                              
|Commencement of volume production |  | 1989                       |  | 1995 for themoduleformerlynamed Fab8A; 1996for themoduleformerlynamed Fab8B |  | 1998                        |  | 2000                                 |  | 1998                                 |  | 2000                                  |  | 2000                                  |  | 2002                                  |  | 1996                        |  | 2004                                 
|                                  |  |                            |  |                                                                             |  |                             |  |                                      |  |                                     
|Estimated full capacity(1)(2)     |  | 29,000waferspermonth       |  | 70,000wafersper month                                                       |  | 35,000waferspermonth        |  | 25,000wafersper month                |  | 34,000wafersper month                |  | 32,000wafersper month                 |  | 24,000wafers permonth                 |  | 47,000wafersper month                 |  | 32,000waferspermonth        |  | 27,000wafersper month                
|                                  |  |                            |  |                                                                             |  |                             |  |                                      |  |                                     
|Wafer size                        |  | 6-inch(150mm)              |  | 8-inch(200mm)                                                               |  | 8-inch(200mm)               |  | 8-inch(200mm)                        |  | 8-inch(200mm)                        |  | 8-inch(200mm)                         |  | 8-inch(200mm)                         |  | 12-inch(300mm)                        |  | 8-inch(200mm)               |  | 12-inch(300mm)                       
|                                  |  |                            |  |                                                                             |  |                             |  |                                      |  |                                     
|Clean room area(3)                |  | 4,986sq. meters            |  | 25,029sq. meters                                                            |  | 19,764sq. meters            |  | 16,589sq. meters                     |  | 21,576sq. meters                     |  | 13,812sq. meters                      |  | 8,400sq. meters                       |  | 20,377sq. meters                      |  | 8,800sq. meters             |  | 17,892sq. meters                     
|                                  |  |                            |  |                                                                             |  |                             |  |                                      |  |                                     
|Type of clean rooms (4)           |  | Class-10@0.1um,cleantunnel |  | Class-0.1@0.1um,clean tunnel                                                |  | Class-0.1@0.1um,cleantunnel |  | Class100@0.3um,SMIF/mini-environment |  | Class100@0.3um,SMIF/mini-environment |  | Class 100@0.3um,SMIF/mini-environment |  | Class 100@0.3um,SMIF/mini-environment |  | Class 100@0.3um,SMIF/mini-environment |  | Class-0.1@0.1um,cleantunnel |  | Class 100@0.3um,SMIF/mini-environment

---

|(1) | Measured in 8-inch wafer equivalents.
|--- | -------------------------------------



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|(2) | The capacity of a fab is determined based on the capacity ratings given by manufacturers of the equipment used in the fab, adjusted for, among other factors, actual output during
uninterrupted trial runs, expected down time due to set up for production runs and maintenance and expected product mix.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(3) | Area represents the total area of clean rooms within a fab.
|--- | -------------------------------------------------------------



|(4) | Class represents the cleanliness of clean rooms in the fab. Class-10@0.1um means a standard of air purity under which the amount of dust is limited to fewer than 10
particles of contaminants of 0.1 micron or greater per one cubic foot per minute of air flow. Class-0.1@0.1um means a standard of air purity under which the amount of dust is limited to fewer than one particle of contaminant of 0.1 micron or greater
per 10 cubic feet per minute of air flow. Class-100@0.3um means a standard of air purity under which the amount of dust is limited to fewer than 100 particles of contaminants of 0.3 micron or greater per one cubic foot per minute of air flow. The
general production environment may be organized into clean tunnels or mini environments. In a clean tunnel environment, the clean room is divided into many tunnels with partitions. A higher level of cleanliness is kept inside
the tunnel for production. Mini-environments within a clean room use Standard Mechanical Interface technology, or SMIF, which employs input/output devices designed to protect products from contamination while providing a standard mechanical
interface to wafer production tools. Mini-environment is generally a preferred approach because it reduces building structural costs and operating costs, allows flexibility in equipment layout and facilitates the ramping-up process during capacity
expansion.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(5) | Formerly SiS Microelectronics Corporation, or SiSMC, which we acquired in July 2004.
|--- | ------------------------------------------------------------------------------------



|(6) | All of UMCis operations and assets were transferred to our Singapore branch Fab 12i on April 1, 2005.
|--- | ------------------------------------------------------------------------------------------------------



The following table sets forth the size and primary use of our facilities and
whether such facilities, including land and buildings, are owned or leased. Our land in the Hsinchu and Tainan Science Parks is leased from the ROC government.



|                                                                                   |  |                      |  |                             |  |                                           
|---------------------------------------------------------------------------------- |  | -------------------- |  | --------------------------- |  | ------------------------------------------
|Location                                                                           |  | Size (Land/Building) |  | Primary Use                 |  | Owned or Leased (Land/Building)           
|                                                                                   |  | (in square meters)   |  |                             |  |                                           
|Fab 6A, 10 Innovation 1st Rd., Hsinchu Science Park, Hsinchu, Taiwan 308, ROC      |  | 27,898/34,981        |  | 6-inch wafer production     |  | Leased (expires in February 2007)/Owned   
|                                                                                   |  |                      | 
|Fab 8AB, 3 Li-Hsin 2nd Rd., Hsinchu Science Park, Hsinchu, Taiwan 300, ROC.        |  | 62,114/81,751        |  | 8-inch wafer production     |  | Leased (expires in March 2014)/Owned      
|                                                                                   |  |                      | 
|Fab 8C, 6 Li-Hsin 3rd Rd., Hsinchu Science Park, Hsinchu, Taiwan 300, ROC          |  | 9,007/28,984         |  | 8-inch wafer production     |  | Leased (expires in March 2016)/Owned      
|                                                                                   |  |                      | 
|Fab 8D, 8 Li-Hsin 3rd Rd., Hsinchu Science Park, Hsinchu, Taiwan 300, ROC          |  | 9,089/29,181         |  | 8-inch wafer production     |  | Leased (expires in March 2016)/Owned      
|                                                                                   |  |                      | 
|Fab 8E, 17 Li-Hsin Rd., Hsinchu Science Park, Hsinchu,
Taiwan 300, ROC             |  | 35,000/74,067        |  | 8-inch wafer production     |  | Leased (expires in February 2016)/Owned   
|                                                                                   |  |                      | 
|Fab 8F, 3 Li-Hsin 6th Rd., Hsinchu Science Park, Hsinchu, Taiwan 300, ROC.         |  | 24,180/65,744        |  | 8-inch wafer production     |  | Leased (expires in February 2018)/Owned   
|                                                                                   |  |                      | 
|Fab 8S(1), 16 Creation 1st Rd., Hsinchu Science Park, Hsinchu, Taiwan 308, ROC.    |  | 20,404,/65,614       |  | 8-inch wafer production     |  | Leased (expires in December 2023)/Owned   
|                                                                                   |  |                      | 
|Fab 12A, 18 Nan-Ke 2nd Rd., Tainan Science Park, Sinshih, Tainan, Taiwan 744, ROC. |  | 56,000/165,607       |  | 12-inch wafer production    |  | Leased (expires in October 2017)/Owned    
|                                                                                   |  |                      | 
|UMCJ, 1580, Yamamoto, Tateyama-City, Chiba, Japan                                  |  | 388,402/21,420       |  | 8-inch wafer production     |  | Mostly leased (expires in June 2049)/Owned
|                                                                                   |  |                      | 
|UMCi(2), 3 Pasir Ris Drive 12 Singapore 519528                                     |  | 84,372/141,787       |  | 12-inch wafer production    |  | Leased (expires in March 2031)/Owned      
|                                                                                   |  |                      | 
|United Tower, 3 Li-Hsin 2nd Rd., Hsinchu Science Park, Hsinchu, Taiwan 300, ROC.   |  | 5,737/85,224         |  | Administration office       |  | Leased (expires in March 2014)/Owned      
|                                                                                   |  |                      | 
|Tunhwa South Rd. Office, 3F, 76, Sec. 2, Tunhwa S. Rd., Taipei, Taiwan 106, ROC    |  | 166/2,221            |  | Administration office       |  | Owned/Owned                               
|                                                                                   |  |                      | 
|Testing Building, 1, Chin-Shan, St. 7, Hsinchu, Taiwan
300, ROC.                   |  | 10,762/41,318        |  | Leased to several companies |  | Owned/Owned                               

---

|(1) | Formerly SiSMC, which we acquired in July 2004.
|--- | -----------------------------------------------



|(2) | All of UMCis operations and assets were transferred to our Singapore branch Fab 12i on April 1, 2005.
|--- | ------------------------------------------------------------------------------------------------------



Process Technology



Process technology is a set of specifications and parameters that we
implement for manufacturing the critical dimensions of the patterned features of the circuitry of semiconductors. Our process technologies are currently among the most advanced in the foundry industry. These advanced technologies have enabled us to
provide flexible production schedules to meet our customers particular needs.



The continued enhancement of our process technologies has enabled us to manufacture semiconductor devices with smaller geometries, allowing us to produce more dice on a given wafer. For example, in 1997 we became one
of the first foundries to produce semiconductor products using 0.25-micron process technology, and in 1999 we were among the first foundries to offer 0.18-micron process services. In addition, we pioneered the use of copper interconnect metallurgies
for the dedicated foundry industry. These copper interconnect metallurgies allow better



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reliability and higher conductivity than traditional aluminum interconnects. We began volume production using 0.13-micron process technology in 2002. Our
extensive experience in the 0.13-micron process technology has helped smooth our transition to 90-nanometer pilot production. Many of the materials and techniques, including copper interconnects and low-k dielectric materials, that were first used
in connection with the 0.13-micron process technology also apply to the 90-nanometer copper technology. Our 90-nanometer process marks further advance in our technology achievements, incorporating up to nine copper metal layers, triple gate oxide
and other advanced features and using chrom-less phase-shift masks. In 2003, we were one of the first foundries to deliver working customer products using advanced 90-nanometer copper technology. This technology has been in volume production since
the second quarter of 2004 after passing several product certifications. We believe our progress in the development of 90-nanometer copper technology continues to benefit our customers in the fields of computers, communications, consumer
electronics, and others with special preferences in certain aspects of the products, such as the ultimate performance, density and power consumption.



The table below sets forth our actual process technology range, categorized by line widths, or the minimum physical dimensions of the transistor gate of
integrated circuits in production by each fab, for 2004, and the estimated annual full capacity of each fab, actual total annual output and capacity utilization rates for 2002, 2003 and 2004:



|                         |  |                                                            |      |                                                                |   |      |       |   |      |       |  
|------------------------ |  | ---------------------------------------------------------- | ---- | -------------------------------------------------------------- | - | ---- | ----- | - | ---- | ----- | -
|                         |  | Year Ended December 31, 2004 Range of Process Technologies |      | Year Ended December 31,                                        |  
|                         |  |                                                            | 2002 |                                                                |   | 2003 |       |   | 2004 |      
|                         |  | (in microns)                                               |      | (in thousands of 8-inch wafer equivalents, except percentages) |  
|Fab                      |  |                                                            |      |                                                                |   |      |       |   |      |       |  
|6A                       |  | 0.5                                                        |      | 349                                                            |   |      | 352   |   |      | 346   |  
|8AB                      |  | 0.5 to 0.25                                                |      | 853                                                            |   |      | 801   |   |      | 796   |  
|8C                       |  | 0.35 to 0.15                                               |      | 355                                                            |   |      | 325   |   |      | 386   |  
|8D                       |  | 0.25 to 0.09                                               |      | 214                                                            |   |      | 238   |   |      | 256   |  
|8E                       |  | 0.5 to 0.18                                                |      | 376                                                            |   |      | 354   |   |      | 401   |  
|8F                       |  | 0.25 to 0.15                                               |      | 312                                                            |   |      | 341   |   |      | 349   |  
|8S(1)                    |  | 0.35 to 0.15                                               |      |                                                               |   |      |      |   |      | 131   |  
|12A                      |  | 0.18 to 0.065                                              |      | 119                                                            |   |      | 234   |   |      | 392   |  
|UMCJ                     |  | 0.35 to 0.15                                               |      | 400                                                            |   |      | 360   |   |      | 370   |  
|UMCi(2)                  |  | 0.13 to 0.09                                               |      |                                                               |   |      |      |   |      | 101   |  
|Total estimated capacity |  |                                                            |      | 2,978                                                          |   |      | 3,005 |   |      | 3,528 |  
|Total output (actual)    |  |                                                            |      | 1,941                                                          |   |      | 2,549 |   |      | 3,205 |  
|Capacity utilization     |  |                                                            |      | 65.2                                                           | % |      | 84.8  | % |      | 90.8  | %

---

|(1) | Formerly SiSMC, which we acquired in July 2004.
|--- | -----------------------------------------------



|(2) | Began volume production in the first quarter of 2004. All of UMCis operations and assets were transferred to our Singapore branch Fab 12i on April 1, 2005.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------



The table below sets forth a breakdown of number
and percentage of wafer output by process technologies for 2002, 2003 and 2004. We began commercial operation of our 0.13-micron and 90-nanometer process technologies in the first quarter of 2002 and the second quarter of 2003, respectively.



|                      |  |                                                                |  |       |      |  |       |      |       |   |  |       |  |       |  
|--------------------- |  | -------------------------------------------------------------- |  | ----- | ---- |  | ----- | ---- | ----- | - |  | ----- |  | ----- | -
|                      |  | Year Ended December 31,                                        | 
|                      |  | 2002                                                           |  |       | 2003 |  |       | 2004 |      
|                      |  | (in thousands of 8-inch wafer equivalents, except percentages) | 
|Technology            |  |                                                                |  |       |      |  |       |      |       |   |  |       |  |       |  
|90 nanometers         |  |                                                               |  |      |      |  | 1     |      | 0.0   | % |  | 39    |  | 1.2   | %
|0.13 micron           |  | 27                                                             |  | 1.4   | %    |  | 130   |      | 5.1   |   |  | 313   |  | 9.8   |  
|0.15 micron           |  | 75                                                             |  | 3.9   |      |  | 124   |      | 4.9   |   |  | 327   |  | 10.2  |  
|0.18 micron           |  | 247                                                            |  | 12.7  |      |  | 489   |      | 19.2  |   |  | 627   |  | 19.6  |  
|0.25 micron           |  | 429                                                            |  | 22.1  |      |  | 547   |      | 21.5  |   |  | 508   |  | 15.9  |  
|0.35 micron           |  | 735                                                            |  | 37.9  |      |  | 855   |      | 33.5  |   |  | 944   |  | 29.4  |  
|0.50 micron or higher |  | 428                                                            |  | 22.0  |      |  | 403   |      | 15.8  |   |  | 447   |  | 13.9  |  
|                      |  |                                                                |  |       |      |  |       |      |       |   |  |       |  |       |  
|Total                 |  | 1,941                                                          |  | 100.0 | %    |  | 2,549 |      | 100.0 | % |  | 3,205 |  | 100.0 | %
|                      |  |                                                                |  |       |      |  |       |      |       |   |  |       |  |       |  



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We primarily manufacture semiconductors using CMOS process. CMOS is the most widely used process
technology because it requires lower power than other technologies and allows dense placement of components onto a single semiconductor. The low power consumption and high density characteristics of the CMOS process allow the continued development
of high performance semiconductors that are smaller and faster. We also manufacture semiconductors using BICMOS technology, which combines bipolars attribute of high speed with the high density and lower power consumption of CMOS.



In response to the growing trend in the market for SoC products, we have
also developed system integration technologies such as embedded memory macro, radio frequency and mixed-signal processes, in order to accommodate the need of SoC designers. We have also developed high yield 0.13-micron Deep Trench DRAM, 1T-SRAM,
6T-SRAM and embedded flash memories. We are the only foundry company that can provide low-, medium- and high-density embedded memory solutions for leading-edge SoC designs.



Capacity and Utilization



The fabs in Taiwan we own directly are named Fab 6A, Fab 8AB, Fab 8C, Fab 8D, Fab 8E, Fab 8F and Fab 8S, all of which are
located in the Hsinchu Science Park in Taiwan, and Fab 12A, which is located in the Tainan Science Park in Taiwan. Fab 8AB consists of two modules. Fab 6A commenced production in 1989, and Fab 8A (currently part of Fab 8AB) commenced production in
1995. In 1995, we established three foundry ventures with 11 leading fabless design companies, including Xilinx, Trident and Alliance Semiconductor Corp. to establish state-of-the-art 8-inch fabs. We owned an approximately 40% equity interest in
each of these foundry ventures. Assisted by capital contributions made by our partners, we were able to expand our capacity quickly while reducing our capital risk. Three of our fabs, a fab formerly named Fab 8B (currently part of Fab 8AB), Fab 8C
and Fab 8D, were established under these foundry ventures and began commercial production in 1996, 1998 and 2000, respectively. The commencement of commercial operations of Fab 8D was delayed because of a fire in 1997 that substantially damaged the
fab. In 1998, we obtained management control over UTEK Semiconductor, a publicly listed company in Taiwan, which operated an 8-inch fab that was later renamed Fab 8E, to further increase our capacity. Our capacity increased further in the first
quarter of 1999 when we acquired an approximate 52.3% in equity interest and management control of UMCJ, which owns an 8-inch fab in Japan. In the fourth quarter of 2000, we completed construction of Fab 12A, a 12-inch fab in Tainan, Taiwan. We
began volume production of 12-inch wafers at Fab 12A in 2002. Fab 12A currently has a capacity of 22,000 12-inch wafers per month, equivalent to 49,500 8-inch wafers per month. In addition, in March 2001, we entered into a foundry venture agreement
with EDB Investments and Infineon to form UMCi to construct and operate a 12-inch fab in Singapores Pasir Ris Wafer Fab Park. Pursuant to the sale and transfer agreements entered in August 2003 and March 2004, we purchased all of the UMCi
shares held by Infineon and EDB Investments. Through subsequent purchases, UMCi became our wholly owned subsidiary in December 2004. The facilities of UMCi, including its 12-inch fab, employ advanced process technologies including 0.13-micron and
90-nanometer processes. UMCi began volume production in the first quarter of 2004 and currently has a monthly capacity of 12,000 12-inch wafers, which is equivalent to a monthly capacity of 27,000 8-inch wafers. For operational purposes, all of
UMCis operations and assets were transferred to our Singapore branch Fab 12i on April 1, 2005.



Furthermore, at the end of 2003, our capacity utilization rate reached 100%, making it impossible for us to meet the demand of our global customers. In
view of the timing and resources required in building a new fab, we believed that an acquisition of SiS Microelectronics Corporation, or SiSMC, an 8-inch wafer fab, was the most effective method to quickly relieve the production bottleneck and
maximize growth in response to the strong recovery in the semiconductor industry. Consequently, we acquired SiSMC through a share swap in July 2004 and renamed it as Fab 8S. Fab 8S operates an 8-inch wafer fab with a current capacity by
24,000 wafers per month.



Historically, the downturn we
experienced from the beginning of the fourth quarter of 2000 until early 2003 had a material adverse effect on industry-wide utilization rates including ours. Due to the decreased demand for semiconductors in 2001 and 2002, our average capacity
utilization rate decreased from 100% in 2000 to 46.6% in 2001 and to 65.2% in 2002. With a general recovery in the worldwide semiconductor industry, our average capacity utilization rate increased to 84.8% in 2003 and 90.8% in 2004.



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Equipment



Because the effectiveness and efficiency of our manufacturing processes greatly depend on the quality and technology of our
equipment, we generally purchase equipment that complements our existing process technology and anticipated advanced process technology. The principal equipment we use to manufacture semiconductor devices are scanners/steppers, cleaners and track
equipment, inspection equipment, etchers, furnaces, wet stations, strippers, implanters, sputters, CVD equipment, probers and testers. Other than an immaterial amount of equipment we lease for the use of our fabs in Taiwan, we own all of our
equipment.



Our policy on equipment purchases is to purchase
from a small number of qualified vendors to ensure consistency. Due to this policy, our equipment is mostly of consistent quality and capable of delivering similar performance.



In implementing our capacity expansion and technology advancement plans, we expect to make significant purchases of
equipment required for our foundry services. Some of the equipment is available from a limited number of vendors and/or is manufactured in relatively limited quantities, and some equipment has only recently been developed. We believe that our
relationships with equipment suppliers are good and that we can leverage our position as a major purchaser of semiconductor manufacturing equipment to purchase equipment on better terms, including shorter lead time, than the terms received by
several other foundries.



Although we have not in the past
experienced any material problems in procuring the latest generation equipment on a timely basis, the expansion of our fabrication facilities and facilities of other semiconductor companies may put additional pressure on the supply of advanced
equipment and maintenance services for such equipment. In periods of unpredictably high market demand, the lead time from order to delivery of such equipment can be as long as six to 12 months. We seek to manage this process through early
reservation of appropriate delivery slots and constant communications with our suppliers as well as by utilizing our good relationships with the vendors.



Raw Materials



Our manufacturing processes use many raw materials, primarily silicon wafers, chemicals, gases and various types of precious sputtering targets. These raw
materials, with the exception of wafers, are generally available from several suppliers. Our policy with respect to raw material purchases, similar to that for equipment purchases, is to select only a small number of qualified vendors who have
demonstrated quality and reliability on delivery time of the raw materials. We generally do not have any long-term supply contracts with our vendors.



Our general inventory policy is to maintain sufficient stock of each principal raw material for production and rolling forecasts of near-term requirements
received from customers. In addition, we have agreements with several key material suppliers under which they hold similar levels of inventory in their warehouses for our use. However, we are not under any obligation to purchase raw material
inventory that is held by our vendors for our benefit until we actually order it. We typically work with our vendors to plan our raw material requirements on a quarterly basis, with indicative pricing generally set on a quarterly basis. The actual
purchase price is generally determined based on the prevailing market conditions. In the past, prices of our principal raw materials have not been volatile to a significant degree. Although we have not experienced any shortage of raw materials that
had a material effect on our operations, and supplies of raw materials we use currently are adequate, shortages could occur in various critical materials due to interruption of supply or an increase in industry demand.



The most important raw material used in our production processes is silicon
wafer, which is the basic raw material from which integrated circuits are made. The principal suppliers for our wafers are Shin-Etsu, MEMC Electronic Materials, Inc. and Formosa Komatsu Silicon Corporation. We have in the past obtained and believe
that we will continue to be able to obtain a sufficient supply of silicon wafers. We believe that we have close working relationships with our wafer suppliers. Based on such long-term relationships, we believe that these major suppliers will use
their best efforts to accommodate our demand.



We use a large
amount of water in our manufacturing process. We obtain water supplies from government-owned entities and recycle approximately 85% of the water that we use during the manufacturing process. We also



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use substantial amounts of dual loop electricity supplied by Taiwan Power Company in the manufacturing process. We maintain back-up generators that are
capable of providing adequate amounts of electricity to maintain the required air pressure in our clean rooms in case of power interruptions. We believe our back-up devices are adequate in preventing business interruptions caused by power outages
and emergency situations.



Quality Control



We believe that our advanced process technologies and
reputation for high quality and reliable services and products have been important factors in attracting and retaining leading international and domestic semiconductor companies as customers.



Our process technologies and fabrication facilities have been
qualified by our customers after satisfying certain stringent quality inspections. Generally our customers, in addition to conducting their own product qualifications, will perform on-site fab audits. These audits normally address
quality management, documentation control, procurement and material incoming inspection, product final inspection, calibration and certification training systems. These audits include both data/record review and physical fabrication area tours for
verification of conformity to specifications and procedures. If the audit findings are satisfactory, then the fab facility is termed qualified for proceeding with further product qualification and later volume production. Most of our
established customers, including AMD, ATI, Conexant Systems, Infineon, Kawasaki Microelectronics, Inc., LSI, MediaTek, Motorola, Novatek, Philips, Qualcomm, Sharp, Sony, STMicroelectronics, Texas Instruments, Trident, Xilinx and 3Com, have audited
our fabrication facilities and our fabs have successfully passed their qualification requirements.



Our policy is to implement quality control measures to ensure the delivery of consistent high yield production with reliable performance for our
customers. We test and monitor the quality of raw materials, process and products at various stages in the manufacturing process before shipment to customers. Reliability assurance also includes in-process wafer level reliability monitoring as well
as packaged level reliability compliance. Our quality control is also continually enhanced through our top down annual Policy Management and bottom up Total Quality Management (TQM) activities, involving various independent quality
control teams from our various foundries: Quality Control Circle, Quality Improvement and Innovation Team, Employee Suggestion System and Project Management Team. We also have a Quality and Reliability Assurance Division, which consists of more than
367 engineers, technicians and other staff as of March 31, 2005. This Division is responsible for incoming materials quality inspection, in process quality audit, outgoing product quality inspection, quality system and standards maintenance,
reliability assurance, reliability engineering and customer queries. In addition, our efforts to observe benchmark and best practices among fabs in the industry have also contributed to the improvement of our overall quality control procedures.



All our Taiwan-based fabs are ISO/TS 16949:2002 certified and
also registered under the Year 2000 version of ISO9001. ISO/TS 16949:2002 sets the criteria for developing a fundamental quality management system. It focuses on continual improvement, defect prevention and the reduction of variation and waste. The
Year 2000 version of ISO9001 emphasizes customer satisfaction and resource management.



Services and Products



We
primarily engage in wafer fabrication for foundry customers. To optimize fabrication services for our customers, we work closely with them as they finalize circuit design and contract for the preparation of masks to be used in the manufacturing
process. We also offer our customers turnkey services by providing them with subcontracted assembly and test services. We believe that this ability to deliver a variety of foundry services in addition to wafer fabrication enables us to accommodate
the needs of a full array of integrated device manufacturers, system companies and fabless design customers with different in-house capabilities.



Wafer manufacturing requires many distinct and intricate steps. Each step in the manufacturing process must be completed with precision in order for
finished semiconductor devices to work as intended. The processes require taking raw wafers and turning them into finished semiconductor devices generally through five steps: circuit design, mask tooling, wafer fabrication, assembly and test. The
services we offer to our customers in each of these five steps are described below.



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Circuit Design. At this initial design stage, our engineers generally work with our
customers to ensure that their designs can be successfully and cost-effectively manufactured in our facilities. We have assisted an increasing number of our customers in the design process by providing them with access to our partners
electronic design analysis tools, intellectual property and design services as well as by providing them with custom embedded memory macro-cells. In our Silicon Shuttle program, we offer customers and intellectual property providers early access to
actual silicon samples with their desired intellectual property and content in order to enable early and rapid use of our advanced technologies. The Silicon Shuttle program is a multi-chip test wafer program that allows silicon verification of
intellectual property elements. In the Silicon Shuttle program, several different vendors can test their intellectual property using a single mask set, greatly reducing the cost of silicon verification for us and the participating vendors. The high
cost of masks for advanced processes makes this program attractive to intellectual property vendors. ARM Limited, Artisan Components (which merged with ARM Limited in December 2004), Faraday Technology Corp., or Faraday Technology, MIPS Technologies
International, Virage Logic Corporation and Virtual Silicon Technology have utilized our Silicon Shuttle program. In our ASIC Plus program, we coordinate with leading suppliers of intellectual property, design and ASIC services to ensure their
offerings are available to our customers in an integrated, easy to use manner which matches customers need to our technologies.



Mask Tooling.Our engineers generally assist our customers to design and/or obtain masks that are optimized for our advanced process
technologies and equipment. Actual mask production is usually provided by independent third parties specializing in mask tooling.



Wafer Fabrication. As described above, our manufacturing service provides all aspects of the wafer fabrication process by utilizing a full
range of advanced process technologies, including 0.15-micron and 0.13-micron processes and copper interconnection technology. We have also made significant progress in developing the advanced 90-nanometer copper technology and the SoC process
technology. We have been shipping products based on our 90-nanometer copper technology to our customers since late March 2003. During the wafer fabrication process, we perform procedures in which a photosensitive material is deposited on the wafer
and exposed to light through the mask to form transistors and other circuit elements comprising a semiconductor. The unwanted material is then etched away, leaving only the desired circuit pattern on the wafer. As part of our wafer fabrication
services, we also offer wafer probing services, which test, or probe, individual die on the processed wafers and identify dice that fail to meet required standards. We prefer to conduct wafer probing internally to obtain speedier and
more accurate data on manufacturing yield rates.



Assembly and Testing. We offer our customers turnkey services by providing the option to purchase finished semiconductor products that have been assembled and tested. We outsource assembly and test services to leading local
assembly and test service providers, including Siliconware Precision Industries Co., Ltd., or Siliconware, and Advanced Semiconductor Engineering Inc. in Taiwan. After final testing, the semiconductors are shipped to our customers designated
locations.



Customers and Markets



Our primary end customers consist of fabless design companies, integrated
device manufacturers and system companies. Fabless design companies, including leading firms such as ATI, Conexant Systems, MediaTek, Novatek, Qualcomm, Realtek, and Xilinx, have historically accounted for a majority of our revenues. We also provide
our services to integrated device manufacturers, such as AMD, Infineon, LSI, Philips, Sony, STMicroelectronics and Texas Instruments. The following table presents the percentages of our net operating revenues by types of customers during the last
three years:



|                                |  |                         |   |  |       |   |  |       |  
|------------------------------- |  | ----------------------- | - |  | ----- | - |  | ----- | -
|                                |  | Year Ended December 31, |  
|                                |  | 2002                    |   |  | 2003  |   |  | 2004  |  
|Customer Type                   |  |                         |   |  |       |   |  |       |  
|Fabless design companies        |  | 74.0                    | % |  | 66.5  | % |  | 64.8  | %
|Integrated device manufacturers |  | 25.6                    |   |  | 33.5  |   |  | 35.2  |  
|System companies                |  | 0.4                     |   |  | 0.0   |   |  | 0.0   |  
|                                |  |                         |   |  |       |   |  |       |  
|Total                           |  | 100.0                   | % |  | 100.0 | % |  | 100.0 | %
|                                |  |                         |   |  |       |   |  |       |  



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We categorize sales geographically based on the country or region in which the end customer is
headquartered, which may differ from our revenues from the countries to which we actually sell or ship our products. The following table presents a geographic breakdown of our net operating revenues during the last three years:



|                       |  |                         |   |  |       |   |  |       |  
|---------------------- |  | ----------------------- | - |  | ----- | - |  | ----- | -
|                       |  | Year Ended December 31, |  
|                       |  | 2002                    |   |  | 2003  |   |  | 2004  |  
|Region                 |  |                         |   |  |       |   |  |       |  
|North America          |  | 35.1                    | % |  | 36.1  | % |  | 41.5  | %
|Asia (excluding Japan) |  | 43.2                    |   |  | 36.4  |   |  | 32.5  |  
|Europe                 |  | 14.1                    |   |  | 14.9  |   |  | 15.9  |  
|Japan                  |  | 7.6                     |   |  | 12.6  |   |  | 10.1  |  
|                       |  |                         |   |  |       |   |  |       |  
|Total                  |  | 100.0                   | % |  | 100.0 | % |  | 100.0 | %
|                       |  |                         |   |  |       |   |  |       |  



Although we are not
dependent on any single customer, a significant portion of our net operating revenues have been generated from sales to a few customers. Our top 10 end-customers accounted for approximately 55.1% of our net operating revenues in 2004. Our top two
customers each accounted for 11% and 10% of our net operating revenues in 2004. We believe our success in attracting these end customers is a direct result of our commitment to high quality service and our intense focus on customer needs and
performance.



We sell and market mainly wafers which in turn
are used in a number of different applications by our customers. Percentages of our net operating revenues derived from our products used in communication devices, consumer electronics, PC, memory and other applications were 45.9%, 27.7%, 22.0%,
2.5% and 1.9%, respectively, in 2004.



We focus on providing a
high level of customer service in order to attract customers and maintain their ongoing loyalty. Our culture emphasizes responsiveness to customer needs with a focus on flexibility, speed and accuracy throughout our manufacturing and delivery
processes. Our customer-oriented approach is especially evident in two types of services: customer design development services and manufacturing services. We believe that our large production capacity and advanced process technology enable us to
provide better customer service than many other foundries through shorter turn-around time, greater manufacturing flexibility and higher manufacturing yields.



We work closely with our customers throughout the design development and prototyping processes. Our design support team closely interacts with
customers and intellectual property vendors to facilitate the design process and to identify their specific requirements for intellectual property offerings. We are responsive to our customers requirements in terms of overall turn-around time
and production time-to-market by, for example, helping our customers streamline their IP offering processes and delivering prototypes in a timely and easy-to-use fashion. We also maintain flexibility and efficiency in our technical capability and
respond quickly to our customers design changes.



For IP
offerings, we work with several leading IP vendors from digital, memory and analog fields in the semiconductor industry, such as ARM Limited, Artisan Components (which merged with ARM Limited in December 2004), Faraday Technology, Virage Logic
Corporation, Rambus and Virtual Silicon Technology to deliver quality IP blocks that have been silicon validated using our advanced processes for our customers. Our alliance programs with major electronic design automation vendors, such as Cadence,
Magma, Mentor and Synopsys, provide our customers with seamless digital/analog reference design procedures and easy-to-use design solutions. For design services, partners such as Faraday Technology are able to provide turnkey solutions from design
to production. By continuously enhancing our IP offerings, reference design procedures and design services through collaboration with major vendors, we aim to provide complete, accurate and user-friendly SoC solutions to our customers.



As a design moves into manufacturing production, we continue to provide
ongoing customer support through all phases of the manufacturing process. The local account manager works with our customer service representative to ensure the quality of our services, drawing upon our marketing and customer engineering support
teams as required.



In 1996, we introduced our original on line
service, through which we provided our customers secure access via the Internet to critical manufacturing data, including process step location, start date, estimated ship-out date and



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quantity as their products move through our fabs. In October 2000, we officially launched our web-based customer information service system, known as
My UMC, which gives our customers easy access to our foundry services by providing a total online supply chain solution. My UMC offers 24-hour access to detailed account information such as manufacturing, engineering and design
information through each customers own customized start page. Some of the features available to customers through My UMC include:



| |  |  | viewing the status of orders from the start of production to the final shipping stages;
| | - |  | ---------------------------------------------------------------------------------------



| |  |  | viewing design layouts to shorten customers tape out time;
| | - |  | -----------------------------------------------------------



| |  |  | collecting customer engineering requests;
| | - |  | -----------------------------------------



| |  |  | gathering and downloading data for design purposes; and
| | - |  | -------------------------------------------------------



| |  |  | accessing online and in real time the same manufacturing data used by our fab engineers.
| | - |  | ----------------------------------------------------------------------------------------



My UMC provides our customers with a level of information previously enjoyed only by integrated device manufacturers that
conducted each step of the manufacturing and material procurement processes internally.



To enhance our ability to provide online services to our customers, we are currently in various stages of implementing a business project that provides customers with design support through our help desk and
IP/Library information and responses to their mask tooling requests. Moreover, we continuously enrich the content of UMC customers services website and provide customers direct-to-system links over the Internet (B2B) with proprietary
technology to efficiently meet our customers requests.



We price our products on a per die or per wafer basis, taking into account the complexity of the technology, the prevailing market conditions, the order size, the cycle time, the strength and history of our relationship with the customer
and our capacity utilization. Our main sales office is located in Taiwan, which is in charge of our sales activities in Asia. Our sales in Europe are currently made through United Microelectronics (Europe) BV, our wholly-owned subsidiary based in
Amsterdam. Our sales in North America are made through UMC Group (USA), our subsidiary located in Sunnyvale, California.



We designate a portion of our wafer manufacturing capacity to some of our customers primarily under two types of agreements: reciprocal commitment
agreements and deposit agreements. Under a reciprocal commitment agreement, the customer agrees to pay for, and we agree to supply, a specified capacity at a specified time in the future. Under a deposit agreement, the customer makes in advance a
cash deposit for an option on a specified capacity at our fabs for a similar period of time. Option deposits are credited to wafer purchase prices as shipments are made. If this customer does not use the specified capacity, it will forfeit the
deposit but, in certain circumstances and with our permission, the customer may arrange for a substitute customer to utilize such capacity. We are also obligated in some cases to make available capacity to customers under other types of agreements,
such as our capacity commitment arrangement with our venture partners.



We advertise in trade journals, organize technology seminars, hold a variety of regional and international sales conferences and attend a number of industry trade fairs to promote our products and services. We also publish a bi-monthly
corporate newsletter for our customers.



Competition



The worldwide semiconductor foundry industry is highly competitive,
particularly during periods of overcapacity and inventory correction. We compete internationally and domestically with dedicated foundry service providers as well as with integrated device manufacturers and final-product manufacturers which have
in-house manufacturing capacity or foundry operations. Some of our competitors have substantially greater production, financial, research and development and marketing resources than we have. As a result, these companies may be able to compete more
aggressively over a longer period of time than we can. In addition, several new dedicated foundries have commenced operations and compete directly with us. Any significant increase in competition may erode our profit margins and weaken our earnings.



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We believe that our primary competitors in the foundry services market are Taiwan Semiconductor
Manufacturing Company Limited, Semiconductor Manufacturing International (Shanghai) Corporation and Chartered Semiconductor Manufacturing Ltd., as well as the foundry operation services of some integrated device manufacturers such as IBM and
Toshiba. Other competitors such as DongbuAnam Semiconductor, Grace Semiconductor Manufacturing Corp., Silterra Malaysia Sdn. Bhd. and 1st Silicon (Malaysia) Sdn. Bhd. have initiated efforts to develop substantial new foundry capacity, although much
of such capacity involves less cost-effective production than the 12-inch fabs for which we possess technical know-how. New entrants in the foundry business are likely to initiate a trend of competitive pricing and create potential overcapacity in
legacy technology. The principal elements of competition in the semiconductor foundry industry include technical competence, production speed and cycle time, time-to-market, research and development quality, available capacity, manufacturing yields,
customer service and price. We believe that we compete favorably with other foundries on each of these elements, particularly our technical competence and research and development capabilities.



Intellectual Property



Our success depends in part on our ability to obtain patents, licenses and other intellectual property rights covering our
production processes and activities. To that end, we have acquired certain patents and patent licenses and intend to continue to seek patents on our production processes. As of March 31, 2005, we held 2,827 U.S. patents and 4,901 patents issued
outside of the United States.



Our ability to compete also
depends on our ability to operate without infringing on the proprietary rights of others. The semiconductor industry is generally characterized by frequent litigation regarding patent and other intellectual property rights. As is the case with many
companies in the semiconductor industry, we have from time to time received communications from third parties asserting patents that cover certain of our technologies and alleging infringement of certain intellectual property rights of others. We
expect that we will receive similar communications in the future. Irrespective of the validity or the successful assertion of such claims, we could incur significant costs and devote significant management resources to the defense of these claims,
which could seriously harm our company.



In order to minimize
our risks from claims based on our manufacture of semiconductor devices or end-use products whose designs infringe on others intellectual property rights, we in general accept orders only from companies that we believe enjoy satisfactory
reputation and for products that are not identified as risky for potential infringement claims. Furthermore, we obtain indemnification rights from customers. We also generally obtain indemnification rights from equipment vendors to hold us harmless
from any losses resulting from any suit or proceedings brought against our company involving allegation of infringement of intellectual property rights on account of our use of the equipment supplied by them.



We have entered into various patent cross-licenses with major technology
companies, including a number of leading international semiconductor companies such as Agere, IBM and Texas Instruments. We may choose to renew our present licenses or to obtain additional technology licenses in the future.



Research Development



We spent NT$7,368 million, NT$5,859 million and NT$7,364 million (US$232 million) in 2002, 2003 and 2004, respectively, on
research and development, which represented 9.8%, 6.1% and 5.7%, respectively, of our net operating revenues for these periods. We plan to continue to invest significant amounts on research and development in 2005 with the goal of maintaining a
leading position in the development of advanced process technologies. Our research and development efforts have recently allowed us to provide our customers access to certain advanced process technology, such as 90-nanometer copper technology for
volume production and 65- and 45-nanometer process technology for early engineering prototypes, prior to the implementation of those advanced process technologies by most integrated device manufacturers and our competitors. We intend to sustain our
commitment to these efforts.



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Our research and development efforts have focused primarily on improving the efficiency and production
yields of our manufacturing services. From time to time, we jointly develop new technology with universities and research institutions. The primary target of our research and development efforts in the next few years will be focused on the volume
production of 65-nanometer, 45-nanometer and new and improved SoC foundry processes. As of March 31, 2005, we employed 565 professionals in our research and development activities. In addition, other management and operational personnel are also
involved in research and development activities but are not separately identified as research and development professionals. We also have created in-house inventions and know-how. We were issued a substantial number of patents in 2002, 2003 and
2004, most of which are semiconductor-related.



Our Investments



Pursuant to our investment guidelines, we plan to
maintain our shareholdings in Unimicron Technology Corp. or Unimicron Technology, Faraday Technology and Silicon Integrated Systems Corporation, or SiS, because of these companies strategic importance to our future operations and expansion.



Unimicron Technology, formerly known as World Wiser
Electronics Incorporated, a Taiwan-based manufacturer of printed circuit boards and high density interconnections, was established in January 1980. We held a 37.95% stake in Unimicron Technology as of September 30, 2001. Unimicron Technology,
Bestmult Industry Co. and UniMicron Technology Co. completed the merger of the three companies on October 31, 2001. Unimicron Technology was the surviving corporate entity and is expected to be one of the top three printed circuit board
manufacturing companies in Taiwan. We were a founding investor in Faraday Technology, a company that offers advanced intellectual property and libraries to our foundry customers. As of March 31, 2005, we held 32.44% and 23.88% in Unimicron
Technology and Faraday Technology, respectively.



In connection
with the settlement of our litigations with SiS, we and SiS agreed in late 2002 to enter into a broad scope of cooperation, including, among other things, exchange of process patents, production support and our board representation in SiS. Under the
settlement, SiS also agreed to engage us as its sole external provider of foundry services for its integrated circuits designed with 0.18 micron or smaller processors. To further strengthen our relationship with SiS, we decided to invest in SiS. As
of March 31, 2005, we held 16.16% of SiSs outstanding share capital. In addition, our representatives currently hold four out of seven board seats of SiS, and John Hsuan, our vice chairman, is the chairman of SiS. In July 2004, we acquired
SiSMC, a wafer foundry company spun off from SiS in 2003.



Depending on the market conditions, we intend to gradually reduce our other investments through secondary equity offerings, exchangeable bond offerings and other measures available to our company. We sold 105 million, 49 million and 84
million common shares of AU Optronics Corp., or AU Optronics, in 2002, 2003 and 2004. We issued US$235 million Exchangeable Bonds due 2007 in May 2002 and US$206 million Exchangeable Bonds due 2008 in July 2003, which are exchangeable, at the option
of the bondholders, into common shares or American depositary shares, or ADSs, and common shares of AU Optronics, respectively. As of December 31, 2004, all bondholders of the Exchangeable Bonds due 2008 have exercised their rights to exchange their
bonds into shares of AU Optronics. As of March 31, 2005, we held 1.44% in AU Optronics.



In addition, on April 2, 2002, we transferred to Hitachi Ltd., or Hitachi, all of our interest in Trecenti Technologies, Inc., or Trecenti, a joint venture with Hitachi to build and operate a 12-inch fab in Japan. In
October 2003, we sold 17 million common shares of Novatek for NT$1,626 million. In November 2003, we sold all of our interest in Teco Electric & Machinery Co., Ltd., or Teco, consisting of 77 million common shares, for NT$886 million. In 2003,
we sold 9 million common shares of MediaTek for NT$3,243 million. In 2004, we sold 6 million common shares of Novatek for NT$513 million (US$16 million) and 7 million common shares of MediaTek for NT$1,612 million (US$51 million). As of March 31,
2005, we held 16.56% and 8.76% in Novatek and MediaTek, respectively.



Environmental Matters



The semiconductor
production process generates gaseous wastes, liquid wastes, waste water and other industrial wastes in various stages of the manufacturing process. We have installed various types of anti-pollution equipment in our fabrication facilities to reduce,
treat and, where feasible, recycle the wastes generated in our manufacturing



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process. We receive assistance with disposal of industrial waste from the Science Park Administration and Southern Taiwan Science Park Administration. Our
operations are subject to regulation and periodic monitoring by Taiwans Environmental Protection Administration and local environmental protection authorities.



We believe that we have adopted anti-pollution measures for the effective maintenance of environmental protection standards
consistent with the practice of the semiconductor industry in Taiwan. In 2004, we spent approximately NT$350 million (US$11 million) for pollution control equipment. Our monthly waste disposal fees were approximately NT$4 million (US$0.1 million),
and our annual cost for environmental monitoring was approximately NT$3 million (US$0.1 million). We also believe that we are in compliance in all material respects with applicable environmental laws and regulations.



Environmental, Safety and Health Management Systems



We have implemented extensive environmental, safety and health management
systems. These systems enable our operations to identify applicable environmental, safety and health regulations, assist in evaluating compliance status and timely establish loss preventive and control measures. The systems we implemented in all our
fabs in Taiwan have been certified as meeting the ISO 14001 and OHSAS 18001 standards. ISO 14001 consists of a set of standards that provide guidance to the management of organizations to achieve an effective environmental management system.
Programs are established at manufacturing locations to ensure that all accidental spills and discharges are properly addressed. OHSAS 18001 is a recognizable occupational health and safety management system standard, which may be applied to assess
and certify our management systems. Our goal in implementing ISO 14001 and OHSAS 18001 systems is to continually improve our environmental, health and safety management.



Litigation



As is the case with many companies in the semiconductor industry, we have from time to time received notices alleging infringement of intellectual
property rights of others and breach of warranties. We investigate and evaluate each of these notices. Except as described below, we are not currently involved in material litigation or other proceedings.



Hejian, a semiconductor manufacturer in Suzhou, China, was set up in December
2001. Soon after the establishment of Hejian, there were various rumors that Hejian was set up by us, which we denied immediately because we did not inject any capital into nor did we transfer any technology to Hejian. Our denials were widely
reported in the local press. In addition, in April 2002, the Investment Commission of the Ministry of Economic Affairs of the Republic of China, which is the government authority in charge of approving investments and technology transfers by Taiwan
companies to entities located in China, made inquiries on us regarding Hejian but did not find any violations of laws or regulations by us to that effect.



On February 15, 2005, the Hsinchu District Prosecutors Office conducted a search of our facilities. We were informed verbally by the
prosecutors office at the time of the search (but without any written notice) that such search was necessary for the prosecutors offices investigation regarding certain allegations of criminal offenses. The materials taken away by
the prosecutor from the search revealed that the prosecutor was focusing on the alleged relationship between Hejian and us. We later learned that the major defendants named by the prosecutor include our Vice Chairman, and the person responsible for
the management of Hejian, who is a former employee of our company. The prosecutor alleged that the defendants breached their fiduciary duty owed to us and violated ROC securities laws. Because this incident was widely reported by local news media,
several of our shareholders filed a complaint against our Chairman with the Hsinchu District Prosecutors Office.



We were only able to confirm that at least 25 defendants in total, including our Chairman and Vice Chairman, were investigated by the prosecutor after the
prosecutor commenced interrogation in March 2005. The allegation made by the prosecutor is that these defendants collectively moved our companys funds, technology, equipment, customers orders and labor resources to Hejian without
regulatory approval. Although we believe that no such acts were committed by any person, our Chairman and Vice Chairman had been informed in an interrogation in June 2005 by the prosecutor that they were being investigated for alleged violations of
ROC securities laws and a breach of fiduciary duty, asserting that our management has acted against our shareholders interests by offering technical assistance to Hejian.



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As of the date of this annual report, no charge had been filed by the prosecutor against any member of
our management, including our Chairman or Vice Chairman. If our Chairman or Vice Chairman were to be found guilty as charged by the court, he will be required by ROC law to resign from our board, which would have a material adverse effect on our
business and operations.



After the prosecutor instituted his
investigation, the ROC FSC, a regulatory authority that supervises securities, banking, futures, and insurance activities in Taiwan, began their investigation into any violation of ROC securities laws by us. In April 2005, our Chairman was fined
with (1) in the amount of NT$2.4 million by the FSC for our delay in making public disclosure timely (within two days) regarding the information relating to Hejian which was resolved in our board meeting on March 4, 2005, and (2) in the amount of
NT$0.6 million for our failure to disclose the information regarding Hejians verbal promise of a fair return to us in connection with our assistance we had provided to Hejian. As a result of the imposition of the fines by the FSC, our company
was also fined in the amount of NT$30,000 by the Taiwan Stock Exchange for a delay in making public disclosure relating to the same information relating to Hejian that was resolved in our board meeting on March 4, 2005. Although our Chairman and we
have respectively appealed, we cannot assure you that either our Chairman or we would prevail on appeal.



In 1997, Oak Technology Inc., or Oak Technology, filed a lawsuit against us in the U.S. District Court for the Northern District of California, and
initiated a companion administrative law proceeding before the International Trade Commission, or ITC. Both actions claim patent infringement regarding certain types of CD-ROM controllers, and the District Court case also claims that we breached a
settlement we entered into with Oak Technology in connection with the same technology. The District Court case was stayed pending an outcome in the ITC case. The ITC Administrative Law Judge found there was no infringement by us, and in September
1999, the ITC affirmed this finding. Oak Technology appealed the ITCs order on non-infringement to the Court of Appeals for the Federal Circuit, which then unanimously affirmed the ITCs order in May 2001. Based on the Federal
Circuits opinion and on a covenant not to sue filed by Oak, the declaratory judgment patent counterclaims were dismissed from the district court case. However, in connection with its breach of contract and other claims, Oak Technology seeks
damages in excess of US$750 million. The District Court has set dates for dispositive motions in the second quarter of 2005 and the trial date to begin after December 5, 2005. We believe that Oaks claims are without merit and intend to
vigorously defend the suit and to pursue our counterclaims. As with all litigations, we cannot predict the outcome with certainty.



In November 2002, Library Technologies, Inc., or LTI, filed suit against Virtual Silicon Technology, Silicon Metrics Corporation, our subsidiary UMC Group
(USA) and us in U.S. District Court in San Francisco, California. LTI alleges in this case that we infringed on LTIs copyrights, committed unfair competition, trade secret misappropriation, and tortious interference with contract in connection
with the allegedly unauthorized copying and use of LTIs software related to library characterization tools. On January 21, 2004, the District Court entered a dismissal on all claims against us. As a result, these matters are resolved.



Risk Management



As our management believes that management of risks involved in our
manufacturing processes is an integral part of our management process and essential to our smooth and safe operation and production, we have endeavored to implement risk management strategies that are pioneering in the semiconductor industry. In
1998, we established our risk management division to comprehensively plan for and respond to emergencies and disasters. This division is now managed by a team of experienced risk management personnel.



We have been working closely with internationally renowned risk consultants
in various fields to identify, analyze, and evaluate the risks commonly found in the semiconductor industry. These consultants include EQE International Inc. and VEC International Corp. in the area of seismic protection, Environmental and
Occupational Risk Management, Inc. in the area of equipment safety management, and American International Underwriters, Ltd. or Marsh Risk Consulting in the area of loss control audit. We believe our risk evaluation process will enable us to avoid
or mitigate potential losses and accordingly protect our company values. In 2001, based on the recommendation of EQE International Inc. and Vibration Engineering Consultants, we completed our seismic protection improvement projects.



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In 2004, we achieved a number of risk management goals, aiming to improve our emergency response,
communication and business recovery during times of crisis. We developed a Risk Identification & Quantification Program for identification and evaluation of risks associated with our equipment and facilities in accordance with international and
local standards. We perform such evaluations twice a year. We established a Power Supply Reliability Study & Improvement Project to examine and improve the adequacy and reliability of the power supply to all our facilities. We upgraded our
emergency response capabilities and increased the number of our internal fire fighters from 53 to 73 in 2004, of which 10 are full-time professionals. We also established an Emergency Response Auditing Program to implement training exercises to
improve the responsiveness of our workforce during emergency situations. Under this program, all fab personnel must go through a test to evaluate their responsiveness and performance during an emergency such as fire, chemical leaks or chemical
spills. Finally, we implemented the SARS and Bird Flu Business Continuity Plan to evaluate the potential impact of the diseases.



Insurance



We maintain industrial all risk insurance for our buildings, facilities, equipment and inventories. The insurance for fabs and their equipment covers
physical damage and business interruption losses up to their respective policy limits except for exclusions as defined in the policy. We also maintain public liability insurance for losses to third parties arising from our business operations. We
believe that our insurance coverage is adequate to cover all major types of losses relevant to the semiconductor industry practice. However, significant damage to any of our production facilities, whether as a result of fire or other causes, could
seriously harm our business.



|C. | Organizational Structure
|-- | ------------------------



In January 2000, we completed a merger in which United Integrated Circuits, a subsidiary, and UTEK Semiconductor, United Silicon and United Semiconductor,
our affiliates, were merged into United Microelectronics. Immediately prior to the merger, United Microelectronics and its consolidated subsidiaries owned approximately 61.6%, 12.5%, 38.8% and 42.5% of these entities, respectively, and had
management control over each of them. As a result of the merger, United Microelectronics has been consolidating the business and operations of these companies for financial reporting purposes since January 3, 2000, except for United Integrated
Circuits, which has been consolidated since January 1, 1999.



In March 2001, we entered into a foundry venture agreement with EDB Investments and Infineon relating to the formation of UMCi to construct and operate a 12-inch wafer fab in Singapore Pasir Ris Wafer Fab Park. Pursuant to the sale and
transfer agreements entered in August 2003 and March 2004, we purchased all of the shares of UMCi held by Infineon and EDB Investments. Through subsequent purchases, UMCi became our wholly-owned subsidiary in December 2004. For operational purposes,
all of UMCis operations and assets were transferred to our Singapore branch Fab 12i on April 1, 2005.



We acquired SiSMC through a share swap in July 2004 and renamed it as Fab 8S. Fab 8S operates an 8-inch wafer fab with a current capacity by
24,000 wafers per month.



On April 1, 2005, United Foundry
Service, Inc. transferred all of its operations and assets to UMC Group (USA). Following the transfer, we have obtained the shareholders approval to liquidate United Foundry Service, Inc.



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The following diagram shows our corporate structure immediately prior to our consolidation:



LOGO



The following diagram shows our
corporate structure as of March 31, 2005:



LOGO





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|D. | Property, Plants and Equipment
|-- | ------------------------------



Please refer to B. Business OverviewManufacturing Facilities for a discussion of our property, plants and equipment.



|ITEM 5. | OPERATING AND FINANCIAL REVIEW AND PROSPECTS
|------- | --------------------------------------------



Unless stated otherwise, the discussion and analysis of our financial condition and results of operations in this section apply to our financial
information as prepared in accordance with ROC GAAP. You should read the following discussion of our financial condition and results of operations together with the consolidated financial statements and the notes to such statements included in this
annual report. ROC GAAP varies in certain significant respects from US GAAP. These differences and their effects on our financial statements are described in Note 33 to our audited consolidated financial statements included in this annual report.



For the convenience of readers, NT dollar amounts used
in this section for, and as of, the year ended December 31, 2004 have been translated into U.S. dollar amounts using US$1.00 = NT$31.74, the noon buying rate of the Federal Reserve Bank of New York on December 31, 2004. The U.S. dollar translation
appears in parentheses next to the relevant NT dollar amount.



Overview



We are one of the worlds leading independent
semiconductor foundries, providing comprehensive wafer fabrication services and technologies to our customers based on their designs. We manage our business and measure our results of operations based on a single industry segment.



We have expanded our production capacity over the past several years,
increasing our monthly capacity from 175,000 8-inch wafer equivalents in December 1999 on a combined basis to approximately 355,000 8-inch wafer equivalents in December 2004 on an actual basis. Our annual total production capacity reached 3,528,000
8-inch wafer equivalents in 2004. As a result of this increase in capacity, we have benefited from larger economies of scale. The larger economies of scale when capacity utilization rate is high have better enabled us to reduce our per unit
production cost, which improves margins. However, when capacity utilization rate is low, this increased capacity has led to higher per unit production cost and decreased margins.



On January 3, 2000, United Microelectronics completed a merger in which each of UTEK Semiconductor, United Semiconductor,
United Silicon and United Integrated Circuits was merged into United Microelectronics. The total purchase price of the merger was valued at approximately NT$42,543 million. In this section, we refer to these transactions as the merger and, unless
otherwise specified, the historical financial data discussed herein refer to United Microelectronics consolidated financial data.



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We acquired SiSMC through a share swap in July 2004 and renamed it as Fab 8S. Fab 8S operates
an 8-inch wafer fab with a current capacity of 24,000 wafers per month. Under the sale and transfer agreement entered in August 2003 and March 2004, we purchased all of UMCi shares held by Infineon and EDB Investments. Through subsequent purchases,
UMCi became our wholly-owned subsidiary in December 2004.



Cyclicality of
the Semiconductor Industry



As the semiconductor industry
is highly cyclical, revenues varied significantly over this period. It can take several years to plan and construct a fab and bring it to operations. Therefore, during periods of favorable market conditions, semiconductor manufacturers often begin
building new fabs or acquiring existing fabs in response to anticipated demand growth for semiconductors. In addition, after commencement of commercial operations, fabs can increase production volumes rapidly. As a result, large amounts of
semiconductor manufacturing capacity typically become available during the same time period. Absent a proportional growth in demand, this increase in supply often results in semiconductor manufacturing overcapacity, which has led to a sharp decline
in semiconductor prices and significant capacity underutilization.



Between 1999 and 2000, as global semiconductor demand experienced substantial growth, our average selling price of semiconductor wafers and devices during that period increased. In connection with this increase in demand and selling price,
several semiconductor manufacturers, including our company, announced plans to significantly expand production capacities. However, the semiconductor industry experienced a downturn beginning in the fourth quarter of 2000 until early 2003, which
resulted in overcapacity, excess inventory and reduced demand. Such industry downturn had substantially slowed down those expansion plans. Due to the decreased demand for semiconductors in 2001 and 2002, our average capacity utilization rate
decreased from 100% in 2000 to 46.6% in 2001 and to 65.2% in 2002. With a general recovery in the worldwide semiconductor industry, our average capacity utilization rate increased to 84.8% in 2003 and 90.8% in 2004. We believe that our results in
2002, 2003 and 2004 reflect the ongoing uncertainty in the global economy, conservative corporate information technology spending and low visibility with respect to end market demand.



Pricing



We price our products on either a per die or a per wafer basis, taking into account the complexity of the technology, the prevailing market conditions,
the order size, the cycle time, the strength and history of our relationship with the customer and our capacity utilization. Because semiconductor wafer prices tend to fluctuate frequently, we in general review our pricing on a quarterly basis. As a
majority of our costs and expenses are fixed or semi-fixed, fluctuations in our products average selling prices historically have had a substantial impact on our margins. Our average selling price increased approximately 12.2% from 2003 to
2004, mainly due to our shift towards higher-priced product mix using more advanced technology.



We believe that our current level of pricing is comparable to that of other leading foundries in each respective geometry. We believe that our ability to
provide a wide range of advanced foundry services and process technologies as well as large manufacturing capacity will enable us to compete effectively with other leading foundries at a comparable price level.



Capacity Utilization Rates



Our operating results are characterized by relatively high fixed costs. In
2002, 2003 and 2004, approximately 74.3%, 71.7% and 70.1%, respectively, of our manufacturing costs consisted of depreciation, a portion of indirect material costs, amortization of license fees and indirect labor costs. Starting in 2003, a portion
of our indirect material costs, such as material costs of chemicals, spare parts and quartz, that was included in our fixed costs prior to 2003, has been accounted for in our variable costs. For comparison purposes, the percentages of fixed costs
discussed above are calculated based on the new definition of manufacturing costs. Our fixed costs decreased while our variable costs increased in 2004 due to (i) the increase of direct material costs from NT$5,349 million in 2003 to



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NT$6,922 million (US$218 million) in 2004 due to the addition of Fab 8S (formerly SiSMC) and UMCi and the ramp up of
capacity and output of Fab 12A, and (ii) the increase of costs of spare parts in Fab 12A from NT$630 million in 2003 to NT$1,238 million (US$39 million) in 2004.



If our utilization rates increase, our costs would be allocated over a larger number of units, which generally leads to
lower unit costs. As a result, our capacity utilization rates can significantly affect our margins. Our utilization rates have varied from period to period to reflect our production capacity and market demand. Due to the decreased demand for
semiconductors in 2001 and 2002, our average capacity utilization rate decreased from 100% in 2000 to 46.6% in 2001 and to 65.2% in 2002. With a general recovery in the worldwide semiconductor industry, our average capacity utilization rate
increased to 84.8% in 2003 and 90.8% in 2004. Utilization rates can also be affected by efficiency in production facility and product flow management. Other factors affecting utilization rates are the complexity and mix of the wafers produced,
overall industry conditions, the level of customer orders, mechanical failure, disruption of operations due to expansion of operations, relocation of equipment or disruption of power supply and fire or natural disaster.



Our production capacity is determined by us based on the capacity ratings
given by manufacturers of the equipment used in the fab, adjusted for, among other factors, actual output during uninterrupted trial runs, expected down time due to set up for production runs and maintenance and expected product mix. Because these
factors include subjective elements, our measurement of capacity utilization rates may not be comparable to those of our competitors.



Change in Product Mix and Technology Migration



Because the price of wafers processed with different technologies varies significantly, the mix of wafers that we produce is among the primary factors
that affect our revenues and profitability. The value of a wafer is determined principally by the complexity of the processing technology used to produce the wafer. Production of devices with higher levels of functionality and greater system-level
integration requires more manufacturing steps and generally commands higher wafer prices. The increase in price generally has more than offset associated increases in production cost once an appropriate economy of scale is reached.



Prices for wafers of a given level of technology generally decline over the
processing technology life cycle. As a result, we have continuously been migrating to increasingly sophisticated technologies to maintain the same level of profitability. For instance, we are among the first foundries to produce chips using
0.13-micron technology. In 2003, we were one of the first foundries to deliver working customer products using advanced 90-nanometer copper technology. This technology has been in volume production since the second quarter of 2004. These types of
technology migration require continuous capital and research and development investment. Because developing and acquiring advanced technologies involve substantial capital investment, we expect to continue to spend a substantial amount of capital on
upgrading our technologies.



Manufacturing Yields



Manufacturing yield per wafer is measured by the number of functional dice
on that wafer over the maximum number of dice that can be produced on that wafer. A small portion of our products is priced on a per die basis, and our high manufacturing yields have assisted us in achieving higher margins. In addition, with respect
to products that are priced on a per wafer basis, we believe that our ability to deliver high manufacturing yields generally has allowed us to either charge higher prices per wafer or attract higher order volumes, resulting in higher margins.



We continually upgrade our process technologies. At the
beginning of each technological upgrade, the manufacturing yield utilizing the new technology is generally lower, sometimes substantially lower, than the yield under the current technology. The yield is generally improved through the expertise and
cooperation of our research and development personnel and process engineers, as well as equipment and at times raw material suppliers. Our policy is to offer customers new process technologies as soon as the new technologies have passed our internal
reliability tests.



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Investments



In addition to making investments to enhance our capacity, technology and service, we have also made a significant number of strategic investments in
other entities. See Item 4. Information on this Company  Our Investments. Most of these investments were made to improve our market position and for strategy considerations. A significant portion of these investments is currently
held by Hsun Chieh, an investment company that was 99.97% owned by United Microelectronics as of March 31, 2005.



Substantially all of our investments are long-term investments, a significant portion of which are in foundry-related companies including fabless design
customers, raw material suppliers and intellectual property vendors. In addition, we also invest in non-foundry-related businesses, such as Mega Financial Holding Co. Ltd., or Mega Financial. In recent years, we have from time to time disposed of
our long-term investments for financial, strategic or other purposes. However, we plan to maintain our shareholdings in Unimicron Technology, Faraday Technology and SiS because of strategic considerations.



See Item 4. Information on the Company  B. Business Overview
 Our Investments for a description of our investments.



Treasury
Share Programs



Prior to 2004, we announced several plans,
none of which was binding on us, to buy back up to an aggregate of 1,551 million of our shares on the Taiwan Stock Exchange at the price range set forth in the plans. As of December 31, 2003, we purchased an aggregate of 335 million of our shares
under these plans. On March 23, 2004, we announced a plan which was not binding on us, to buy back up to 360 million of our shares on the Taiwan Stock Exchange at a price range of NT$19.6 to NT$47.5 per share between March 24, 2004 and May 23, 2004.
Under the plan, we purchased 192 million of our shares at an average purchase price of NT$27.06 per share. Of the repurchased shares, 137 million shares were transferred to our employees and 199 million shares were cancelled as of May 31, 2005. In
addition, on May 13, 2005, we announced a plan, which was not binding on us, to buy back up to 500 million of our shares on the Taiwan Stock Exchange at a price range of NT$13.75 to NT$28.45 per share between May 16, 2005 and July 15, 2005.



Critical Accounting Policies



General



Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements
included in the annual report, which have been prepared in accordance with ROC GAAP. ROC GAAP varies in certain respects from US GAAP. These differences and their effects on our financial statements are described in Note 33 to our audited
consolidated financial statements included in this annual report. The preparation of our audited consolidated financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and
expenses, and related disclosure of contingent assets and liabilities. We evaluate our estimates on an ongoing basis and base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the
circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions
or conditions.



We believe the following critical accounting
policies involve significant judgments and estimates used in the preparation of our audited consolidated financial statements.



Revenue Recognition



Revenue is recognized when title and liability for risk of loss or damage to the products have been transferred to customers, usually upon shipment, as
most of our sales are made in terms of Free on Board (FOB) or Free Carrier (FCA) shipment, for which the title and liability for risk of loss or damage pass to the customer upon our tender of delivery to a carrier approved by the customer. Sales
returns and discounts taking into consideration customer complaints and past experiences are accrued in the same year as such sales are made.



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Accounts Receivable and Allowance for Doubtful Accounts



The allowance for doubtful accounts is provided based on the evaluation of
collectibility and aging analysis of accounts and on managements judgment. In circumstances where the ability of a specific customer to meet its financial obligations is in doubt, a specific allowance will be provided. Considerable judgment is
required in assessing the ultimate realization of these receivables including the current credit worthiness and the past collection history of each customer. If the financial conditions of our customers were to worsen, additional allowances would be
required. A deterioration of economic conditions either in the ROC or in other major overseas markets may contribute to the deterioration of financial conditions of our customers, resulting in an impairment of their ability to make payments.



The allowances for doubtful accounts accounted for 1.0% and
0.7% of our accounts receivables as of December 31, 2003 and 2004, respectively. If we were to change our estimated rate on allowance for doubtful receivables either upward or downward by 10%, our income from operations would have been increased or
decreased by NT$8 million for 2004.



Inventory



Inventories are recorded at cost when acquired and stated at the lower of
aggregate cost, based on the weighted average method, or market value at the balance sheet date. The market values of raw materials and supplies are determined on the basis of replacement cost while net realizable values determined by the average
selling price of the most recent periods are used as market values of work-in-process and finished goods. In addition, allowances for obsolete and slow-moving inventories are determined by analyzing the age of inventories and estimated future sales,
among other things.



Under ROC GAAP, as of December 31, 2004,
if the market prices of our products had been 10% lower, there would have been an adjustment to inventory valuation allowances of approximately NT$245 million.



Deferred Taxes



Most of our existing tax benefits arise from investment tax credits, and others from net operating loss carry-forward and temporary differences. We
recognize these tax benefits as deferred tax assets. Income tax expense or benefit is recognized when there is a net change in deferred tax assets and liabilities. A valuation allowance is recorded to reduce our deferred tax assets to the amount
that we believe will more likely than not be realized. The assessment of the valuation allowance involves subjective assumptions and estimates as it principally depends on the estimation of future taxable income and ongoing prudent and feasible tax
planning strategies. If future taxable income is lower than expected due to future market conditions or other reasons or in the event we determine that we will not be able to realize all or part of our net deferred tax assets in the future, an
adjustment to our deferred tax assets valuation allowance may be required with the adjusting amount charged to income in this period. Likewise, should future taxable income be higher than expected due to future market conditions or other reasons or
in the event we determine that we would be able to realize our deferred tax assets in the future in excess of our net recorded amount, an adjustment to our deferred tax assets valuation allowance would increase income in this period.



Goodwill Impairment



Under US GAAP, we have performed the required goodwill impairment test during the year as required by Statement of Financial
Accounting Standard (SFAS) No. 142, Goodwill and Other Intangible Assets. In assessing the recoverability of our goodwill, we have to make assumptions regarding estimated market capitalization and other factors to determine the fair
value of the respective assets. If these estimates and the related assumptions change the fair value of these assets in the future, we may need to record impairment charges accordingly. We will make regular impairment tests on an annual basis in the
future. If events occur or circumstances change between annual tests that would more likely than not affect the recoverability of the goodwill, such as a significant adverse change in the business climate, an unanticipated competition, or a
significant decline in our market capitalization in relation to net book value, we will perform additional interim tests and impairment loss will be recorded when required.



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Impairment of Long-lived Assets



Under US GAAP, as required by SFAS No.144, Accounting for the Impairment or Disposal of Long-Lived Assets, we
review our long-lived assets that are held and used for impairment whenever events or changes in circumstances indicate that the carrying amount of the long-lived assets might not be recoverable. In other words, we will assess the need for any
impairment write-down only if information indicates that an impairment might exist. Such information may include a significant decrease in market value of long-lived assets or a significant deterioration of market conditions such that the carrying
value of long-lived assets may not be recovered through future cash flows. No impairment indicators were noted for the year. However, if future information indicates a potential impairment and we determine that the estimated future undiscounted cash
flows are less than the carrying value of the assets, an impairment loss will be recognized. The estimates of future cash flows will be based on the estimated useful life, cash flow generating capacity, physical output capacity and other assumptions
of the use of our long-lived assets.



Pensions



We have significant pension benefit costs and liabilities that are developed
from actuarial valuations. Inherent in these valuations are key assumptions including discount rates and expected return on plan assets. We consider current market conditions, including changes in interest rates, in selecting these assumptions.
Changes in the related pension costs or liabilities may occur in the future in addition to changes resulting from fluctuations in our related headcount due to changes in assumptions.



Valuation of Marketable Securities and Long-term Investments



Under ROC GAAP, we classify marketable securities as trading or long-term investments depending on managements intent
to hold the security for long-term purposes. Trading securities comprise securities of public entities or mutual funds with readily determinable market value and are stated at the lower of aggregate cost or market value. Long-term investments
comprise investments in public and non-public entities. We periodically evaluate long-term investments based on market prices, if available, operational performance, financial condition, cash flows, other impairment indicators, sales price of stock
to third parties, and other specific factors relating to the business underlying the investment. When the investment has experienced consistent adverse changes in these factors, impairment would be recorded and could result in a negative impact on
our net income. Actual results from valuation may vary due to the uncertainties regarding the projected financial performance of investments, the expected duration of declines in value and the available liquidity in the capital market to support the
continuing operations.



Under US GAAP, marketable securities
are classified as trading securities or available-for-sale securities. The changes in market value thereof are recorded in earnings or other comprehensive income, respectively. We periodically evaluate the carrying value of available-for-sale
securities and record a charge against earnings to the extent that any decline in the value of a security below cost is determined to be other than temporary.



Derivative Instruments



Under US GAAP, exchange and conversion options embedded in our exchangeable bonds and convertible bonds, respectively, are bifurcated and separately
accounted for under SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities. The bifurcated exchange and conversion options were accounted for as freestanding instruments with the changes in fair value included in
earnings. The fair value of such options is measured using the Black-Scholes option pricing model, which requires us to make subjective assumptions such as expected volatility of the stock over the options life and expected life of the option,
among other things. In determining the input assumptions, we consider historical trends and data together with professional judgment and objective expectation of management. Because the model is sensitive to change in the input assumptions,
different assessment of the required inputs may result in different fair value estimates of the options.



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Employee Stock Options



Under ROC GAAP, we apply the intrinsic value method to recognize the difference between the market share price and the exercise price of our employee
stock options as compensation cost. From January 1, 2004, we also disclose pro forma net income and earnings per share under the fair value method only for the options granted after January 1, 2004.



We have issued employee stock options since 2002, and pro forma information
regarding net income and earnings per share is required by SFAS No. 123, Accounting for Stock-Based Compensation under US GAAP, to account for the employee stock options. The pro forma net income is determined as if the fair value of our
employee stock options was included as compensation expense for the year. In estimating the fair value of the stock options, the Black-Scholes option pricing model is used. As discussed in the preceding paragraph, the use of the valuation model
requires the input of subjective assumptions. In assessing the required inputs, we use historical records wherever available, such as past dividend yields and historical volatility. Because we cannot anticipate when our employees will exercise their
options, we use the mid-point between the vesting date and the expiration date for estimation of the expected life of options. As discussed above, different assessments of the input assumptions may lead to different fair value estimates, which in
turn may affect our pro forma net income disclosed as compensation expense.



|A. | Operating Results
|-- | -----------------



Consolidation



Unlike US GAAP, ROC GAAP does not require us to consolidate subsidiaries whose assets and operating revenues are less than 10% of our non-consolidated assets and operating revenues, respectively. See Note 2 to our audited consolidated
financial statements. As a result, our consolidated financial statements prepared under ROC GAAP do not include the financial results of Fortune Venture Capital Corporation, United Foundry Services Inc., UMC Capital Corporation (including its
subsidiary, UMC Capital (USA)) and United Microelectronics Corp. (Samoa) for 2002 and 2003, and Fortune Venture Capital Corporation, Unitruth Investment Corp., UMC Capital Corporation (including its subsidiary, UMC Capital (USA)), United
Microelectronics Corp. (Samoa), and United Foundry Service Inc. for 2004, each of which is a consolidated subsidiary under US GAAP. In the aggregate, these subsidiaries had net operating revenues equal to approximately nil of our consolidated
revenues for each of the years ended December 31, 2002, 2003 and 2004.



Net Operating Revenues



We generate our
net operating revenues primarily from fabricating semiconductor devices. We also derive a small portion of our net operating revenues from wafer probe services that we perform internally as well as mask tooling services and assembly and test
services that we subcontract out.



Costs of Goods Sold



Our costs of goods sold consist principally of:



| |  |  | overhead, including depreciation and maintenance of production equipment, indirect labor costs, indirect material costs, supplies, utilities and royalties;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | wafer costs;
| | - |  | ------------



| |  |  | direct labor costs; and
| | - |  | -----------------------



| |  |  | service charges paid to subcontractors for mask tooling, assembly and test services.
| | - |  | ------------------------------------------------------------------------------------



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Due to the increasing expenditures related to the purchase of equipment and the construction of new fabs,
our total depreciation expenses have increased from NT$36,568 million in 2002 to NT$39,233 million in 2003 and to NT$45,590 million (US$1,436 million) in 2004.



Operating Expenses



Our operating expenses consist of the following:



| |  |  | Sales and marketing expenses. Sales and marketing expenses consist primarily of salaries and related personnel expenses, wafer sample expenses, intellectual property
development expenses and related marketing expenses. Wafer samples are actual silicon samples of our customers early design ideas made with our most advanced processes and provided to those customers.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | General and administrative expenses. General and administrative expenses consist primarily of salaries for our administrative, finance and human resource personnel, fees for
professional services, and cost of computer and communication systems to support our operations.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Research and development expenses. Research and development expenses consist primarily of salaries and related costs for process and technology research and development and
depreciation on the equipment used related to our research and development.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Non-operating Income and Expenses



Our non-operating income principally consists of:



| |  |  | interest income, which has been primarily derived from time deposits;
| | - |  | ---------------------------------------------------------------------



| |  |  | dividend income, which has been primarily derived from marketable securities and long term investments;
| | - |  | -------------------------------------------------------------------------------------------------------



| |  |  | gain on disposal of investments, which has been primarily derived from our disposal of long-term investments; and
| | - |  | -----------------------------------------------------------------------------------------------------------------



| |  |  | exchange gain, net.
| | - |  | -------------------



Our non-operating expenses principally consist of:



| |  |  | interest expenses, which have been primarily derived from long-term debt;
| | - |  | -------------------------------------------------------------------------



| |  |  | exchange loss, net;
| | - |  | -------------------



| |  |  | loss on decline in market value and obsolescence of inventories, which has been primarily derived from the loss due to the decline in market value and write-off of our inventories;
and
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | other loss, which has been primarily derived from impairment of idle assets.
| | - |  | ----------------------------------------------------------------------------



Taxation



Based on our status as a company engaged in the semiconductor business in Taiwan, we have been granted exemptions from income taxes in Taiwan with respect
to income attributable to capital increases for the purpose of purchasing equipment related to the semiconductor business for a period of four years following each such capital increase. This tax exemption resulted in tax savings of approximately
nil, NT$886 million and NT$3,306 million (US$104 million) in 2002, 2003 and 2004, respectively. As of January 30, 2001, the administrative regulations of the Hsinchu Science Park revoked the preferential tax rate of 20%. Our current tax rate is 25%,
the same rate applicable to companies outside the Hsinchu Science Park.



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We also benefit from other tax incentives generally available to technology companies in Taiwan,
including tax credits applicable against corporate income tax that range from 25% to 50% of the amount of certain research and development and employee training expenses and 5% to 20% of the amount of investment in certain qualified equipment and
technology. These tax incentives resulted in tax savings of approximately nil, NT$1,719 million and NT$4,383 million (US$138 million) in 2002, 2003 and 2004, respectively.



After taking into account the tax exemptions and tax incentives discussed above, we recorded NT$271 million, NT$979 million
and NT$374 million (US$12 million) of tax expense in 2002, 2003 and 2004, respectively. Our effective income tax rate in 2004 was 1.18%.



In 1997, the ROC Income Tax Law was amended to integrate corporate income tax and shareholder dividend tax to eliminate the double taxation effect for
resident shareholders of Taiwan companies. Under the amendment, all retained earnings generated from January 1, 1998 and not distributed to shareholders as dividends in the following year will be assessed a 10% retained earnings tax. See Item
10. Additional InformationE. TaxationROC Tax ConsiderationsDividends. As a result, if we do not distribute all of our annual retained earnings generated beginning January 1, 1998 as either cash and/or stock dividends in the
following year, these earnings will be subject to the 10% retained earnings tax.



Comparisons of Results of Operations



The following table sets forth some of our results of operations data as a percentage of our net operating revenues for the periods indicated.



|                                                      |  |                         |   |  |       |   |  |       |  
|----------------------------------------------------- |  | ----------------------- | - |  | ----- | - |  | ----- | -
|                                                      |  | Year Ended December 31, |  
|                                                      |  | 2002                    |   |  | 2003  |   |  | 2004  |  
|Net operating revenues                                |  | 100.0                   | % |  | 100.0 | % |  | 100.0 | %
|Costs of goods sold                                   |  | 83.4                    |   |  | 77.3  |   |  | 71.5  |  
|                                                      |  |                         |   |  |       |   |  |       |  
|Gross profit                                          |  | 16.6                    |   |  | 22.7  |   |  | 28.5  |  
|Operating expenses:                                   |  |                         |   |  |       |   |  |       |  
|Sales and marketing                                   |  | 2.0                     |   |  | 2.3   |   |  | 2.1   |  
|General and administrative                            |  | 4.7                     |   |  | 4.1   |   |  | 3.8   |  
|Research and development                              |  | 9.8                     |   |  | 6.1   |   |  | 5.7   |  
|                                                      |  |                         |   |  |       |   |  |       |  
|Operating income (loss)                               |  | 0.1                     |   |  | 10.2  |   |  | 16.9  |  
|Net non-operating income (expense)                    |  | 9.2                     |   |  | 5.1   |   |  | 7.7   |  
|                                                      |  |                         |   |  |       |   |  |       |  
|Income (loss) before income tax and minority interest |  | 9.3                     |   |  | 15.3  |   |  | 24.6  |  
|Income tax (expense) benefit                          |  | (0.3                    | ) |  | (1.0  | ) |  | (0.3  | )
|Minority interest (income) loss                       |  | 0.4                     |   |  | 0.3   |   |  | 0.3   |  
|                                                      |  |                         |   |  |       |   |  |       |  
|Net income (loss)                                     |  | 9.4                     |   |  | 14.6  |   |  | 24.6  |  
|                                                      |  |                         |   |  |       |   |  |       |  



2003 Compared with 2004



Net operating revenues. Net operating
revenues increased by 35.0% from NT$95,704 million for 2003 to NT$129,191 million (US$4,070 million) for 2004, largely attributable to an increase in customer demand, which resulted in a 19.1% increase in wafers sold in 2004. In addition, our
average selling price in 2004 increased by 12.2% as compared to 2003 as a direct result of increased customer demand and a shift towards higher-priced product mix using more advanced technology.



Cost of goods sold.Cost of goods sold increased by
25.0% from NT$73,938 million for 2003 to NT$92,393 million (US$2,911 million) for 2004. The rate of increase in cost of goods sold, compared to the magnitude of the increase in net operating revenues, was attributable to the improvement of the
utilization rate from 84.8% in 2003 to 90.8% in 2004 as a result of increased customer demand.



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Gross profit and gross margin.Gross profit increased significantly by 69.1% from
NT$21,766 million for 2003 to NT$36,798 million (US$1,159 million) for 2004. Gross margin increased from 22.7% for 2003 to 28.5% for 2004. The substantial growth in gross profit and gross margin was mainly due to the increase in revenue as a result
of the growth in the average selling price of wafers and sales volume and lower unit cost resulting from increased utilization rate.



Operating income and operating margin. Operating income increased substantially from NT$9,740 million for 2003 to NT$21,806
million (US$687 million) for 2004. Our operating margin increased from 10.2% for 2003 to 16.9% for 2004. The increase in operating margin is largely due to an increase in gross margin. Operating expenses increased by 24.7% from NT$12,026 million for
2003 to NT$14,992 million (US$472 million) for 2004.



Sales and marketing expenses.Our sales and marketing expenses increased by 27.8% from NT$2,171 million for 2003 to NT$2,775 million (US$87 million) for 2004. The increase in sales and marketing expenses was
mainly due to an increase in purchasing intellectual properties from third parties to help our customers to develop SoC. Our sales and marketing expenses as a percentage of our net operating revenues decreased slightly from 2.3% for 2003 to 2.1% for
2004.



General and administrative expenses.Our
general and administrative expenses increased by 21.4% from NT$3,996 million for 2003 to NT$4,853 million (US$153 million) for 2004 largely due to increases in amortization of consolidated debt and personnel expenses. Our general and administrative
expenses as a percentage of our net operating revenues decreased slightly from 4.1% for 2003 to 3.8% for 2004.



Research and development expenses.Our research and development expenses increased by 25.7% from NT$5,859 million for 2003 to NT$7,364
million (US$232 million) for 2004. The increase in research and development expenses resulted primarily from our continued development of 90-nanometer and 65-nanometer process technologies. Our research and development expenses as a percentage of
our net operating revenues decreased slightly from 6.1% for 2003 to 5.7% for 2004.



Net non-operating income. Net non-operating income substantially increased by 100% from NT$4,956 million for 2003 to NT$9,938 million (US$313 million) for 2004 mainly due to gain on disposal of
investments, offset by net exchange and other losses. Gain on disposal of investments increased substantially from NT$6,885 million for 2003 to NT$12,869 million (US$405 million) for 2004 mainly due to the conversion of our exchangeable bonds into
shares of AU Optronics and the sale of our investments in AU Optronics. The gain on the conversion of our exchangeable bonds into shares of AU Optronics and sale of shares of AU Optronics was NT$7,806 million (US$246 million) and NT$2,483 million
(US$78 million), respectively. Due to the appreciation of exchange rate of New Taiwan dollars to US dollars from NT$33.99 on December 31, 2003 to NT$31.74 on December 31, 2004, we had a net exchange loss of NT$929 million (US$29 million) in 2004.
Other losses increased from NT$263 million in 2003 to NT$1,112 million (US$35 million) in 2004 mainly due to impairment of idle assets.



Net income. Due to the factors described above, we incurred a net income of NT$31,843 million (US$1,003 million) for 2004, compared to a net
income of NT$14,020 million for 2003.



2002 Compared with 2003



Net operating revenues. Net operating
revenues increased by 26.9% from NT$75,425 million for 2002 to NT$95,704 million for 2003, primarily as a result of the rise in sales quantities. This was attributable to an increase in customer demand, which resulted in a 39.9% increase in wafers
sold in 2003.



Cost of goods sold.Cost of
goods sold increased by 17.6% from NT$62,887 million for 2002 to NT$73,938 million for 2003. The rate of increase in cost of goods sold, compared to the magnitude of the increase in net operating revenues, was attributable to the improvement in
utilization rate from 65.2% in 2002 to 84.8% in 2003 as a result of increased customer demand.



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Gross profit and gross margin.Gross profit increased by 73.6% from NT$12,538
million for 2002 to NT$21,766 million for 2003. Gross margin increased from 16.6% for 2002 to 22.7 % for 2003. The increase in gross margin was due to lower cost per unit, as a result of larger production and sales volumes, and higher utilization
rate.



Operating income and operating margin.
Operating income increased substantially from NT$112 million for 2002 to NT$9,740 million for 2003. Our operating margin increased from 0.1% for 2002 to 10.2% for 2003. Operating expenses decreased by 3.2% from NT$12,426 million for 2002 to
NT$12,026 million for 2003.



Sales and marketing
expenses.Our sales and marketing expenses increased by 42.2% from NT$1,527 million for 2002 to NT$2,171 million for 2003. The increase in sales and marketing expenses was mainly due to an increase in purchasing intellectual properties from
third parties to help our customers to develop SoC and wafer sample expenses. Our sales and marketing expenses as a percentage of our net operating revenues increased from 2.0% for 2002 to 2.3% for 2003.



General and administrative expenses.Our general and
administrative expenses increased by 13.2% from NT$3,531 million for 2002 to NT$3,996 million for 2003 largely due to the increase of UMCi start-up costs in 2003. UMCi start-up cost was classified as general and administrative expense before it
began volume production in the first quarter of 2004. Our general and administrative expenses as a percentage of our net operating revenues decreased from 4.7% for 2002 to 4.1% for 2003.



Research and development expenses. Our research and development expenses decreased by 20.5% from NT$7,368 million for
2002 to NT$5,859 million For 2003. The decrease in research and development expenses resulted primarily from the completion of a joint development program with IBM and Infineon. Our research and development expenses as a percentage of our net
operating revenues decreased from 9.8% for 2002 to 6.1% for 2003.



The increase in operating margin is largely due to an increase in gross margin, and a decrease in operation expenses.



Net non-operating income. Net non-operating income decreased from NT$6,904 million for 2002 to NT$4,956 million for 2003 mainly due to a
decrease in interest income, a decrease in gain on disposal of investments and an increase in other investment loss. Interest income decreased from NT$1,644 million for 2002 to NT$1,141million for 2003, mainly due to a decrease in interest income
from our time deposits, which resulted from general market interest rate decline. Gain on disposal of investments decreased from NT$8,473 million for 2002 to NT$6,885 million for 2003 mainly due to a decrease in the gain on disposal of investments
in AU Optronics. Moreover, we disposed of all shares of Trecenti and recognized a gain on disposal of investments in Trecenti in 2002. Other investment loss increased from NT$1,419 million for 2002 to NT$1,866 million for 2003 mainly due to
write-offs of our investments in Vialta and LightCross.



Net income. Due to the factors described above, we incurred a net income of NT$14,020 million for 2003, compared to a net income of NT$7,072 million for 2002.



|B. | Liquidity and Capital Resources
|-- | -------------------------------



The foundry business is highly capital intensive. Our development over the past three years has required significant investments. Additional expansion for
the future generally will continue to require significant cash for acquisition of plant and equipment to support increased capacities, particularly for the production of 12-inch wafers, although our expansion program will be adjusted from time to
time to reflect market conditions. In addition, the semiconductor industry has historically experienced rapid changes in technology. To maintain competitiveness at the same capacity, we are required to make adequate investments in plant and
equipment. In addition to our need for liquidity to support the large fixed costs of capacity expansion and the upgrading of our existing plants and equipment for new technologies, as we ramp up production of new plant capacity, we require
significant working capital to support purchases of raw materials for our production and to cover variable operating costs such as salaries until production yields provide sufficiently positive margins for a fabrication facility to produce operating
cash flows.



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We have financed our capital expenditure requirements with cash flows from operations as well as from
bank borrowings, the issuance of bonds and equity-linked securities denominated in NT dollars and U.S. dollars and the proceeds from our ADS offering in September 2000. We incurred capital expenditures of NT$35,978 million, NT$24,820 million and
NT$81,110 million (US$2,555 million) in 2002, 2003 and 2004, respectively, requiring a significant amount of funding from financing activities. Once a fab is in operation at acceptable capacity and yield rates, it can provide significant cash flows.
Cash flows significantly exceed operating income, reflecting the significant non-cash depreciation expense. We generated cash flows from operations of NT$30,527 million, NT$49,625 million and NT$73,938 million (US$2,329 million) in 2002, 2003 and
2004, respectively.



As of December 31, 2004, we had NT$101,382
million (US$3,194 million) of cash and cash equivalents and NT$3,144 million (US$99 million) of marketable securities.



Operating Activities



Our operating activities generated cash of NT$73,938 million (US$2,329 million) for 2004. Cash generated from our operating activities for 2004 was
primarily attributable to add-back of non-cash items, such as depreciation and amortization in the amount of NT$47,172 million (US$1,486 million).



Investment Activities



Net cash used in our investment activities was NT$83,132 million (US$2,619 million) for 2004. In 2004, we used cash of NT$81,110 million (US$2,555
million) to purchase equipment primarily used at our fabs.



We
held several credit-linked deposits and repackage bonds with a total amount of approximately NT$2,942 million (US$93 million) as of December 31, 2004. The repayment in full, including any accrued interest, of these deposits is subject to the
non-occurrence of one or more credit events, which are referenced to the entities fulfillment of their own obligations as well as repayment of their corporate bonds. Upon the occurrence of one or more of such credit events, we may receive nil
or less than the full amount of these deposits and any payment received may be delayed due to the occurrence of certain events. The underlying reference entities are summarized as follows:



|                                                                                 |  |                                      |  |                   
|-------------------------------------------------------------------------------- |  | ------------------------------------ |  | ------------------
|Reference Entities                                                               |  | Principal Amount inOriginal Currency |  | Due Date          
|Siliconwave Precision Industries Co., Ltd., European Convertible Bonds and Loans |  | NT$400 million                       |  | February 5, 2007  
|Siliconwave Precision Industries Co., Ltd., European Convertible Bonds and Loans |  | NT$200 million                       |  | February 5, 2007  
|Chi Feng Blinds Industry Co., Ltd., European Convertible Bonds                   |  | US$2 million                         |  | December 19, 2005 
|HannStar Display Corporation, European Convertible Bonds                         |  | US$5 million                         |  | October 19, 2005  
|UMC Japan, European Convertible Bonds                                            |  | ¥640 million                         |  | March 28, 2007    
|UMC Japan, European Convertible Bonds                                            |  | ¥600 million                         |  | November 29, 2007 
|UMC Japan, European Convertible Bonds                                            |  | ¥400 million                         |  | November 29, 2007 
|Cathay Financial Holding Co., Ltd., European Convertible Bonds                   |  | US$3 million                         |  | May 23, 2005      
|Cathay Financial Holding Co., Ltd., European Convertible Bonds                   |  | US$2 million                         |  | May 23, 2005      
|Advanced Semiconductor Engineering Inc., European Convertible Bonds and Loans    |  | NT$200 million                       |  | September 25, 2007
|UMC Japan, European Convertible Bonds                                            |  | ¥1,000 million                       |  | March 29, 2007    
|UMC Japan, European Convertible Bonds                                            |  | ¥2,000 million                       |  | November 28, 2007 
|UMC Japan, European Convertible Bonds                                            |  | ¥1,100 million                       |  | March 29, 2007    



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Financing Activities



Net cash used in our financing activities was NT$6,832 million (US$215 million) for 2004. For financing activities for 2004, we received cash of NT$23,076
million (US$727 million) mainly from long-term loans. We also repaid long-term loans and bonds of NT$9,366 million (US$295 million) and NT$16,337 million (US$515 million), respectively, in cash in 2004.



Our outstanding short-term loans were NT$2,987 million (US$94 million) as of
December 31, 2004. We had total availability under existing short-term lines of credit, which can be drawn in NT dollars, U.S. dollars, Japanese Yen, Singapore dollars and/or Euros at our discretion, of NT$8,129 million (US$256 million) as of
December 31, 2004. All of our short-term loans are revolving facilities with terms of six months or one year, which may be extended for terms of six months or one year each with lender consent. The weighted average annual effective interest rate
under these facilities ranged between 0.86% and 2.89% as of December 31, 2004. Our obligations under our short-term loans are unsecured.



We had long-term loans of NT$23,711 million (US$747 million) in the aggregate as of December 31, 2004. The interest rates of these long-term borrowings
are variable rates and ranged between 0.81% and 3.55% per year as of December 31, 2004.



We had bonds payable of NT$45,839 million (US$1,444 million) in the aggregate as of December 31, 2004.



We have pledged a substantial portion of our assets with a carrying value of NT$30,059 million (US$947 million) as of December 31, 2004 to secure our
obligations under the long-term loans and bonds.



As of
December 31, 2004, our outstanding long-term liabilities primarily consisted of:



| |  |  | US$600 million secured long-term loan due March 25, 2008;
| | - |  | ---------------------------------------------------------



| |  |  | JPY¥15,000 million unsecured long-term loan;
| | - |  | --------------------------------------------



| |  |  | NT$570 million 5.6% secured domestic bonds due April 27, 2005; these bonds are repayable in seven equal semi-annual installments from April 27, 2002;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | NT$12.75 billion unsecured domestic bonds consisting of two tranches: NT$5.25 billion 5.185% unsecured bonds due April 2006 and NT$7.5 billion 5.285% unsecured bonds due April 2008;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | NT$5 billion 3.520% unsecured domestic bonds due October 2006;
| | - |  | --------------------------------------------------------------



| |  |  | NT$15 billion unsecured domestic bonds, consisting of two tranches: NT$7.5 billion five-year unsecured bonds with interest rates of 4.0% minus 12-month U.S. dollar LIBOR but at the
minimum of 0%, and NT$7.5 billion seven-year unsecured bonds with interest rates of 4.3% minus 12-month U.S. dollar LIBOR but at the minimum of 0%;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | US$98 million Zero Coupon Exchangeable Bonds due 2007;
| | - |  | ------------------------------------------------------



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In May 2002, we issued US$235 million Zero Coupon Exchangeable Bonds due 2007. The proceeds of this
offering have been used to purchase equipment for Fab 8D. These bonds, which are scheduled to mature on May 10, 2007, are exchangeable, at the option of the bondholders, into common shares or ADSs of AU Optronics at an initial exchange price of
NT$59.34 per common share of AU Optronics at any time on or after June 19, 2002, and are redeemable by us under certain circumstances on or any time after August 10, 2002 and prior to May 10, 2007. As of May 31, 2005, US$137 million of Zero Coupon
Exchangeable Bonds due 2007 were exchanged into 87 million common shares of AU Optronics. The current exchange price is NT$51.3 per common share of AU Optronics.



| |  |  | ¥8,630 million Zero Coupon Convertible Bonds due 2007; and
| | - |  | ----------------------------------------------------------



In March 2002, UMCJ issued ¥17,000 million Zero Coupon Convertible Bonds due 2007 at an issue price of 101.75% of the principal amount. The proceeds
of this offering have been used to finance capital expenditures and repay certain loans. The initial conversion price was set at ¥400,000 per share, subject to adjustments upon the occurrence of certain events set forth in the indenture. The
current conversion price is ¥400,000 per share. The bonds are redeemable by UMCJ under certain circumstances at any time on or after March 25, 2005 and prior to March 26, 2007. As of December 31, 2004, UMCJ repurchased ¥8,370 million of the
bonds from the open market of which ¥7,650 million were cancelled.



| |  |  | ¥21,500 million Zero Coupon Convertible Bonds due 2013.
| | - |  | -------------------------------------------------------



In November 2003, UMCJ issued ¥21,500 million Zero Coupon Convertible Bonds due 2013 at an issue price of 101.25% of the principal amount. The
proceeds of this offering have been used to finance capital investments and our investments in UMCi. The conversion price was set at ¥187,500 per share, subject to adjustments upon the occurrence of certain events set forth in the indenture. The
bonds are redeemable by UMCJ under certain circumstances at any time on or after November 27, 2006 and prior to November 25, 2013.



The current portion of long-term loans and bonds due within one year were NT$5,441 million (US$171 million) and NT$2,820 million (US$89 million),
respectively.



Capital Expenditures



We have entered into several construction contracts for the expansion of our
factory space. As of December 31, 2004, these construction contracts amounted to NT$550 million (US$17 million) with an unaccrued portion of the contracts of NT$420 million (US$13 million).



In 2004, we spent approximately NT$81,110 million (US$2,555 million)
primarily to purchase 8-inch and 12-inch wafer-processing equipment and other equipment for research and development and production purposes. Our initial budget for purchases of semiconductor manufacturing equipment for 2005 is approximately US$1 to
1.5 billion. We may adjust the amount of our capital expenditures upward or downward based on the progress of our capital projects, market conditions and our anticipation of future business outlook.



We believe that our existing cash and cash equivalents and short-term
investments will be sufficient to meet our working capital and capital expenditure requirements at least through the end of 2005. We also expect to fund a portion of our capital requirements in 2005 through the cash provided by operating activities.
Due to rapid changes in technology in the semiconductor industry, however, we have frequent demand for investment in new manufacturing technologies. We cannot assure you that we will be able to raise additional capital, should that become necessary,
on terms acceptable to us, or at all. If financing is not available on terms acceptable to us, management intends to reduce expenditures so as to delay the need for additional financing. To the extent that we do not generate sufficient cash flows
from our operations to meet our cash requirements, we may rely on external borrowings and securities offerings to finance our working capital needs or our future expansion plans. The sale of additional equity or equity-linked securities may result
in additional dilution to our shareholders. Our ability to meet our working capital needs from cash flow from operations will be affected by the demand for our products and change in our product mix, which in turn may be adversely affected by
several factors. Many of these factors are outside of our control, such as economic downturns and declines in the average selling prices of our products. The average selling prices of our products have been subjected to downward pressure in the past
and are reasonably likely to be subject to further downward pressure in the future. We have not historically relied, and we do not plan to rely in the foreseeable future, on off-balance sheet financing arrangements to finance our operations or
expansion.



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Transactions with Related Parties



Our transactions with related parties have been conducted on arms-length terms. See Item 7. Major Shareholders
and Related Party TransactionsB. Related Party Transactions and Note 25 to our audited consolidated financial statements included in this annual report.



Inflation/Deflation



We do not believe that inflation in the ROC has had a material impact on our results of operations.



US GAAP Reconciliation



Our consolidated financial statements are prepared in accordance with ROC GAAP, which differs in certain material respects
from US GAAP. Such differences include methods of consolidation and methods for measuring the amounts shown in the financial statements, as well as additional disclosures required by US GAAP. Note 33 to our audited financial statements, included in
this annual report, provides a discussion and quantification of the material differences between ROC GAAP and US GAAP as they related to us. We provide a discussion of some of the material differences included therein below.



The following table sets forth a comparison of our net income and
stockholders equity in accordance with ROC GAAP and US GAAP for the periods indicated.



|                                                            |  |                         |   |  |               |   |  |         |   |  |        |  
|----------------------------------------------------------- |  | ----------------------- | - |  | ------------- | - |  | ------- | - |  | ------ | -
|                                                            |  | Year Ended December 31, |  
|                                                            |  | 2002                    |   |  | 2003          |   |  | 2004    |  
|                                                            |  | NT$                     |   |  | NT$           |   |  | NT$     |   |  | US$    |  
|                                                            |  |                         |   |  | (in millions) |   |  |         |  
|Net income (loss)                                           |  |                         |   |  |               |   |  |         |   |  |        |  
|Net income (loss), ROC GAAP                                 |  | 7,072                   |   |  | 14,020        |   |  | 31,843  |   |  | 1,003  |  
|US GAAP adjustments:                                        |  |                         |   |  |               |   |  |         |   |  |        |  
|Compensation                                                |  | (7,349                  | ) |  | (2,915        | ) |  | (3,540  | ) |  | (112   | )
|Investment in marketable securities                         |  | (319                    | ) |  | 2,447         |   |  | (2,672  | ) |  | (84    | )
|Equity investments:                                         |  |                         |   |  |               |   |  |         |   |  |        |  
|Compensation                                                |  | (471                    | ) |  | (421          | ) |  | (371    | ) |  | (12    | )
|Net income variance between US GAAP and ROC GAAP            |  | (126                    | ) |  | (111          | ) |  | (400    | ) |  | (13    | )
|Adjustments due to change in interest of investee companies |  | 449                     |   |  | (279          | ) |  | (38     | ) |  | (1     | )
|Derivative instruments                                      |  | 1,752                   |   |  | (1,888        | ) |  | 807     |   |  | 25     |  
|Convertible/Exchangeable bonds                              |  | (691                    | ) |  | (619          | ) |  | 827     |   |  | 26     |  
|Impairment loss on goodwill                                 |  |                        |   |  |              |   |  | (31,720 | ) |  | (999   | )
|Income tax effect                                           |  | (23                     | ) |  | 242           |   |  | 494     |   |  | 16     |  
|Consolidated goodwill amortization                          |  |                        |   |  |              |   |  | 21      |   |  | 1      |  
|                                                            |  |                         |   |  |               |   |  |         |   |  |        |  
|Net income (loss), US GAAP                                  |  | 294                     |   |  | 10,476        |   |  | (4,749  | ) |  | (150   | )
|                                                            |  |                         |   |  |               |   |  |         |   |  |        |  
|                                                            | 
|                                                            |  | As of December 31,      |  
|                                                            |  | 2002                    |   |  | 2003          |   |  | 2004    |  
|                                                            |  | NT$                     |   |  | NT$           |   |  | NT$     |   |  | US$    |  
|                                                            |  |                         |   |  | (in millions) |   |  |         |  
|Stockholders equity                                        |  |                         |   |  |               |   |  |         |   |  |        |  
|Total stockholders equity, ROC GAAP                        |  | 217,424                 |   |  | 232,233       |   |  | 266,374 |   |  | 8,392  |  
|Compensation                                                |  | 67                      |   |  | 129           |   |  | 154     |   |  | 5      |  
|Equity investments                                          |  |                         |   |  |               |   |  |         |   |  |        |  
|Net income variance between US GAAP and ROC GAAP            |  | (592                    | ) |  | (477          | ) |  | 394     |   |  | 12     |  
|Stockholders equity variance between US GAAP and ROC GAAP  |  | 1,560                   |   |  | 951           |   |  | 1,068   |   |  | 34     |  
|Investment in marketable securities                         |  | 14,963                  |   |  | 31,189        |   |  | 14,950  |   |  | 471    |  
|Treasury stock                                              |  | (8                      | ) |  | (3            | ) |  | (2      | ) |  | (0     | )
|Unamortized goodwill due to acquisition                     |  | 98,268                  |   |  | 98,268        |   |  | 98,268  |   |  | 3,096  |  
|Adjustments due to change in interest of investee companies |  | 1,605                   |   |  | 1,653         |   |  | 1,527   |   |  | 48     |  
|Derivatives instruments                                     |  | 1,752                   |   |  | (156          | ) |  | 255     |   |  | 8      |  
|Convertible/Exchangeable bonds                              |  | (691                    | ) |  | (1,310        | ) |  | (483    | ) |  | (15    | )
|Impairment loss on goodwill                                 |  |                        |   |  |              |   |  | (31,720 | ) |  | (999   | )
|Difference arising from merger                              |  |                        |   |  |              |   |  | (840    | ) |  | (27    | )
|Income tax effect                                           |  | (323                    | ) |  | (81           | ) |  | 413     |   |  | 13     |  
|                                                            |  |                         |   |  |               |   |  |         |   |  |        |  
|Stockholders equity, US GAAP                               |  | 334,025                 |   |  | 362,396       |   |  | 350,358 |   |  | 11,038 |  
|                                                            |  |                         |   |  |               |   |  |         |   |  |        |  



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Differences between ROC GAAP and US GAAP that have a material effect on our net income as reported under
ROC GAAP include compensation expenses pertaining to stock bonuses to employees, derivative instruments, marketable securities and impairment of goodwill.



Compensation Expenses



Under our articles of incorporation, we are required, under certain circumstances, to allocate a certain portion of prior years unappropriated
earnings to employee bonuses. See Item 10. Additional InformationB. Memorandum and Articles of AssociationDividends and Distributions elsewhere in this annual report. We paid employee bonuses in 2001, 2002 and 2003 in the
form of shares and expect to pay employee bonuses in future periods in the form of cash or shares. The number of shares distributed as part of employee bonuses is obtained by dividing the total nominal, NT dollar amount of the bonus to be paid in
the form of shares by the par value of the shares, or NT$10 per share, rather than their market value, which has generally been substantially higher than par value. Under ROC GAAP, the distribution of employee bonus shares is treated as an
allocation from retained earnings, and we are not required to, and do not, charge the value of the employee bonus shares to income. Under US GAAP, however, we are required to charge the market value of the employee bonus shares to compensation
expense in the period to which they relate, correspondingly reducing our net income and earnings per share calculated in accordance with US GAAP. Under US GAAP, the compensation expense is initially accrued when services are rendered and both the
number of shares to be issued and the price per share are known. Since the actual amount of the compensation is subject to shareholders approval and only determinable at the annual shareholders meeting, which is generally held after the
issuance of our financial statements, we will make the accrual in accordance with the number of shares to be issued under our articles of incorporation, valuing by the closing price at the balance sheet date. When bonuses are approved by the
shareholders in the subsequent year, which normally occurs during the second fiscal quarter, an additional compensation expense is recorded for the difference between the amount initially accrued and the fair market value of the shares actually
granted to employees.



The amounts charged to employee
compensation expense, including certain distributions to directors and supervisors, under US GAAP in respect of the bonus distribution in 2002, 2003 and 2004 were NT$7,349 million, NT$2,915 million and NT$3,540 million (US$112 million),
respectively, representing an aggregate of 426 million shares. Compensation expense accrued, before allocation to inventories, under US GAAP in 2002, 2003 and 2004, for the anticipated 2002, 2003 and 2004 bonus distribution, respectively, was NT$830
million, NT$2,550 million and NT$2,556 million (US$81 million), respectively. The amounts chargeable to income under US GAAP in 2004 in respect of the portion of the 2003 bonus distribution paid in the form of our shares, were NT$1,024 million
(US$32 million), and that in future periods such amounts will continue to be substantial. Net income and earnings per share amounts calculated in accordance with ROC GAAP and US GAAP will differ accordingly. See Note 33 to our consolidated financial
statements.



Derivative Instruments



Under US GAAP, as prescribed by SFAS No.133, Accounting for Derivative
Instruments and Hedging Activities, the derivative instruments embedded in our exchangeable bonds and convertible bonds are bifurcated and separately accounted for, since the economic characteristics and risks of the embedded derivative
instruments and the host contracts are not clearly and closely related, and the contracts that embody both the embedded derivative instruments and the host contracts are not remeasured at fair value with changes in fair value reported in earnings.
As a result, the exchange and conversion options embedded were bifurcated and accounted for as freestanding derivative instruments and the changes in fair value were included in earnings of the year accordingly. See Note 33 to our consolidated
financial statements.



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In addition to some of the factors that affect results of operations as discussed above, the principal
differences between ROC GAAP and US GAAP as they relate to our stockholders equity are the treatment of: (1) marketable securities and (2) consolidated goodwill as discussed below.



Marketable Securities



Under ROC GAAP, marketable securities are carried at the lower of aggregate cost or market value. The unrealized loss resulting from the decline in market
value of investments that are held for short-term investment purposes is charged to the current years earnings while unrealized loss resulting from the decline in market value of investments that are held for long-term purposes is deducted
from the stockholders equity. Under US GAAP, debt securities that we have the positive intent and ability to hold to maturity are classified as held-to-maturity securities and reported at amortized cost. Debt and equity securities that are
bought and traded for short-term profit are classified as trading securities and reported at fair value, with unrealized gains and losses included in earnings. Debt and equity securities not classified as either held-to-maturity or trading
securities are classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of stockholders equity. See Note 33 to our consolidated
financial statements.



Consolidated Goodwill



Under ROC GAAP, the fair value of the net assets received is deemed to be
the value of the consideration for the acquisition of the remaining interests in United Semiconductor, United Silicon, UTEK Semiconductor and United Integrated Circuits in January 2000. Under ROC GAAP, the acquisition cost of merger with SiSMC was
determined using the average market price of the shares exchanged over one month before the effective date, which represented the reasonable market price of the net assets merged from SiSMC. Under US GAAP, EITF No. 99-12 requires that the securities
exchanged should be valued based on the market prices a few days before and after the date when the terms of the acquisition are agreed to and announced. Under US GAAP, the acquisition was accounted for using the purchase method of accounting and
the purchase price was determined using the market value of the shares exchanged. The difference between the fair value of the shares exchanged and the fair value of the net assets acquired created goodwill. Upon the adoption of SFAS No.141 &
142 on January 1, 2002 by us, goodwill ceased to be amortized and is subject to an annual impairment test when events and circumstances indicate a possible impairment may exist. We have one reporting unit to which the assessment of goodwill is
assigned and tested for impairment pursuant to SFAS No. 142. Goodwill impairment was tested in the fourth quarter and the fair value of the reporting unit is determined using the companys quoted stock price. Due to a decline in stock price, we
recognized a goodwill impairment charge of NT$31,720 million as of December 31, 2004 (2003  NT$nil; 2002  NT$nil).



Recent Accounting Pronouncements



In December 2004, the FASB issued SFAS Statement No. 123 (revised 2004), Share-Based Payment, which is a revision of FASB Statement No. 123
Accounting for Stock-Based Compensation. The revised Statement requires all share-based payments to employees, including grants of employee stock options, to be recognized in the financial statements based on their fair values. It is
effective for public companies at the beginning of the annual period beginning after June 15, 2005. We do not expect a material impact on our financial statements resulting from the adoption of SFAS Statement No. 123(R).



In November 2004, SFAS Statement No. 151 amended the guidance in ARB No. 43,
Chapter 4, Inventory Pricing, to clarify the accounting for abnormal amounts of idle facility expense, freight, handling costs and waste material (spoilage) should be recognized as current-period charges and requires the allocation of
fixed production overhead to inventory based on the normal capacity of the production facilities. The guidance is effective for inventory costs incurred during fiscal years beginning after June 15, 2005. The adoption of SFAS No. 151 is not expected
to have a material effect on our earnings or financial position.



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##### Table of Contents

|C. | Research, Development, Patents and Licenses, Etc.
|-- | -------------------------------------------------



The semiconductor industry is characterized by rapid changes in technology, frequently resulting in obsolescence of process technologies and products. As
a result, effective research and development is essential to our success. We invested approximately NT$7,368 million, NT$5,859 million and NT$7,364 million (US$232 million) in 2002, 2003 and 2004, respectively, in research and development, which
represented 9.8%, 6.1% and 5.7%, respectively, of net operating revenues for such periods. We believe that our continuous spending on research and development will help us maintain our position as a technological leader in the foundry industry. As
of March 31, 2005, we employed 565 professionals in our research and development division, 14% of whom hold Ph.D. degrees.



Our current research and development activities seek to upgrade and integrate manufacturing technologies and processes, as well as to develop embedded
memory technologies, including DRAM, SRAM, 1T-SRAM, 6T-SRAM and nonvolatile memories, and advanced device technologies, including SOI and strained silicon. Although we emphasize firm-wide participation in the research and development process, we
maintain a central research and development team primarily responsible for developing cost-effective technologies that can serve the manufacturing needs of our customers. Monetary incentives are provided to our employees if projects result in
successful patents. A substantial portion of our research and development activities are undertaken in cooperation with our customers and equipment vendors.



|D. | Trend Information
|-- | -----------------



Please refer to Overview for a discussion of the most significant recent trends in our production, sales, costs and selling prices. In
addition, please refer to discussions included in this Item for a discussion of known trends, uncertainties, demands, commitments and events that we believe are reasonably likely to have a material effect on our net operating revenues, income from
continuing operations, profitability, liquidity or capital resources, or that would cause reported financial information not necessarily to be indicative of future operating results or financial condition.



|E. | Off-balance Sheet Arrangements
|-- | ------------------------------



We do not generally provide letters of credit to, or guarantees for, or engage in any repurchase financing transactions with any entity other than our
consolidated subsidiaries. We have, from time to time, entered into interest rate swaps to manage our interest rate risks on our floating rate debt instruments and foreign currency forward contracts to hedge our existing assets and liabilities
denominated in foreign currencies and identifiable foreign currency purchase commitments. We do not engage in any trading activities. See Item 11. Quantitative and Qualitative Disclosure about Market Risk.



|F. | Tabular Disclosure of Contractual Obligations
|-- | ---------------------------------------------



The following table sets forth our contractual obligations and commitments with definitive payment terms on a consolidated basis which will require
significant cash outlays in the future as of December 31, 2004.



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|                                   |  |                                  |  |                  |  |           |  |           |  |              
|---------------------------------- |  | -------------------------------- |  | ---------------- |  | --------- |  | --------- |  | -------------
|                                   |  | Payments Due by Period          
|Contractual
Obligations            |  | Total                            |  | Less Than 1 Year |  | 1-3 Years |  | 4-5 Years |  | After 5 Years
|                                   |  | (consolidated) (in NT$ millions)
|Long-term debt(1)                  |  |                                  |  |                  |  |           |  |           |  |              
|Secured long-term loans            |  | 19,044                           |  | 5,441            |  | 10,882    |  | 2,721     |  |             
|Unsecured long-term loans          |  | 4,667                            |  |                 |  | 4,667     |  |          |  |             
|Secured bonds                      |  | 570                              |  | 570              |  |          |  |          |  |             
|Unsecured bonds                    |  | 45,248                           |  | 2,250            |  | 18,309    |  | 10,500    |  | 14,189       
|Capital lease obligations(2)       |  |                                 |  |                 |  |          |  |          |  |             
|Operating leases(3)                |  | 3,187                            |  | 211              |  | 395       |  | 374       |  | 2,207        
|Other long-term obligations(4)     |  | 6,631                            |  | 3,267            |  | 2,943     |  | 421       |  |             
|                                   |  |                                  |  |                  |  |           |  |           |  |              
|Total contractual cash obligations |  | 79,347                           |  | 11,739           |  | 37,196    |  | 14,016    |  | 16,396       
|                                   |  |                                  |  |                  |  |           |  |           |  |              

---

|(1) | Assuming the convertible bonds and exchangeable bonds are both paid off upon maturity.
|--- | --------------------------------------------------------------------------------------



|(2) | Represents our obligations to make lease payments for equipment.
|--- | ----------------------------------------------------------------



|(3) | Represents our obligations to make lease payments to use the land on which our fabs are
located, primarily in the Hsinchu Science Park and the Tainan Science Park in Taiwan and Pasir Ris Wafer Fab Park in Singapore.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(4) | Represents intellectual properties and royalties payable under our technology license agreements. The amounts of payments due under these agreements are determined
based on fixed contract amounts.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|ITEM 6. | DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES
|------- | ------------------------------------------



|A. | Directors and Senior Management
|-- | -------------------------------



The following table sets forth the name, age, position and tenure of each of our directors, supervisors and executive officers as of March 31, 2005. The
biography of each of our directors, supervisors and executive offers is as of December 31, 2004. There is no family relationship among any of these persons. The business address of our directors, supervisors and executive officers is the same as our
registered address.



Tzong-Yeong Lin, who served in the
capacity of the representative of Chiao Tung Bank, resigned as one of our supervisors on May 25, 2005. In the shareholders meeting held on June 13, 2005, Hong-Jen Wu, who served in the capacity of the representative of Chuin Tsie Investment
Co., resigned from our board of directors and SiS was elected as a new director on our board.



|                  |  |     |  |                                                                                   |  |              
|----------------- |  | --- |  | --------------------------------------------------------------------------------- |  | -------------
|Name              |  | Age |  | Position                                                                          |  | Years with Us
|Robert H.C. Tsao  |  | 58  |  | Chairman and managing director                                                    |  | 24           
|                  |  |     | 
|John Hsuan        |  | 53  |  | Vice Chairman and managing director                                               |  | 23           
|                  |  |     | 
|Peter Chang       |  | 59  |  | Vice Chairman and managing director (Representative of Hsun Chieh Investment Co.) |  | 13           
|                  |  |     | 
|Jackson Hu        |  | 56  |  | Director (Representative of Chuin Li Investment Co.) and Chief Executive Officer  |  | 2            
|                  |  |     | 
|Hong-Jen Wu(1)    |  | 53  |  | Director (Representative of Chuin Tsie Investment Co.) and President              |  | 25           
|                  |  |     | 
|Ching-Chang Wen   |  | 55  |  | Director (Representative of Shieh Li Investment Co.) and Business Group President |  | 7            
|                  |  |     | 
|Jack K.C. Wang(2) |  | 58  |  | Director                                                                          |  | 10           
|                  |  |     | 
|Mao-Chung Lin(2)  |  | 73  |  | Director                                                                          |  | 16           
|                  |  |     | 
|Paul S.C. Hsu(2)  |  | 69  |  | Director                                                                          |  | 1            



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|                   |  |     |  |                                                                |  |              
|------------------ |  | --- |  | -------------------------------------------------------------- |  | -------------
|Name               |  | Age |  | Position                                                       |  | Years with Us
|Tzong-Yeong Lin(3) |  | 54  |  | Supervisor (Representative of Chiao Tung Bank
Co., Ltd.)       |  | 1            
|                   |  |     | 
|Tzyy-Jang Tseng    |  | 55  |  | Supervisor (Representative of Hsun Chieh Investment Co., Ltd.) |  | 4            
|                   |  |     | 
|Tsing-Yuan Hwang   |  | 56  |  | Supervisor (Representative of Chuin Tsie Investment Co.)       |  | 10           
|                   |  |     | 
|Chris Chi          |  | 54  |  | Business Group President                                       |  | 8            
|                   |  |     | 
|Fu-Tai Liou        |  | 52  |  | Business Group President                                       |  | 8            
|                   |  |     | 
|Shih-Wei Sun       |  | 48  |  | Senior Vice President                                          |  | 10           
|                   |  |     | 
|Stan Hung          |  | 45  |  | Chief Financial Officer                                        |  | 14           

---

|(1) | Resigned on June 13, 2005.
|--- | --------------------------



|(2) | Member of the Audit Committee.
|--- | ------------------------------



|(3) | Resigned on May 25, 2005.
|--- | -------------------------



Robert H.C. Tsao is the Chairman and a managing director of our company. Mr. Tsao was also our Chairman from 1991 to April 2000. Mr. Tsao received
a Masters degree in Management Science from the National Chiao-Tung University in 1972. Before joining United Microelectronics in 1981, Mr. Tsao was the Vice Chairman of Electronics Research & Service Organization from 1979 to 1981. Mr.
Tsao is also a director of Mega Financial, Unimicron Technology Corp., and United Microdisplay Optronics Corporation and the Chairman of Faraday Technology Corp., UMC Japan, Fortune Venture Capital Corporation, UMCi and Hsun Chieh Investment Co.,
Ltd.



John Hsuanis a Vice Chairman and a managing
director of our company. Mr. Hsuan was our Chairman from April 2000 to May 2001. Mr. Hsuan received a Bachelors degree in Electronics Engineering from the National Chiao-Tung University in 1973. Before joining us in 1982, Mr. Hsuan was a
manager of Electronics Research & Service Organization from 1977 to 1982. Mr. Hsuan is a director of Unimicron Technology Corp., Faraday Technology Corp., Fortune Venture Capital Corporation, UMC Japan, and Hsun Chieh Investment Co., Ltd. and
the Chairman of SiS and United Microdisplay Optronics Corporation.



Peter Changis a Vice Chairman and a managing director of our company. Mr. Chang is a representative of Hsun Chieh Investment Co. Mr. Chang holds a Masters degree in Electrical Engineering from the University of Texas at Austin
in 1971. Prior to becoming a director and the CEO of our company in 1999, Mr. Chang served as the president of United Semiconductor from 1996 to 1999. Mr. Chang is also a director of UMCi.



Jackson Huis a director and the Chief Executive Officer of our
company. Mr. Hu is a representative of Chuin Li Investment Co. Dr. Hu earned his Bachelors degree in electrical engineering from National Taiwan University in 1971 and Masters and Ph.D. degrees in Computer Science from the University of
Illinois at Urbana-Champaign. He also obtained an MBA from Santa Clara University. Dr. Hu joined us at the beginning of 2003 as the president of our New Business Development Group and head of the Design Support Division. Prior to joining us, Dr. Hu
served as the president and chief executive officer of SiRF Technology Inc. from 1996 to 2002 and the senior vice president and general manager of S3 from 1994 to 1996. Mr. Hu is also a director of UMCi and Compal Communications, Inc.



Hong-Jen Wu was a director of our company and, serving in the capacity
of the representative of Chuin Tsie Investment Co., resigned from our board on June 13, 2005. Mr. Wu is the president of our company. Mr. Wu holds both Bachelors and Masters degrees in Chemical Engineering from the National Taiwan
University in 1976. Prior to joining United Microelectronics in 1980, Mr. Wu was a senior engineer at Taiwan General Equipment Corp. Mr. Wu is also a director and the president of UMCJ, and the Chairman of DuPont Photomasks Taiwan Ltd.



Ching-Chang Wen is a director and a business group president of our
company. Dr. Wen is a representative of Shieh Li Investment Co. He received a Ph.D. degree in Electrical Engineering from the University of Pennsylvania in 1979. Prior to joining United Microelectronics in 1996, Dr. Wen served as a vice president of
Winbond Electronics Corp. Mr. Wen is also a director of DuPont Photomasks Taiwan Ltd.



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Jack K. C. Wang is a director of our company. Mr. Wang was a supervisor of our company from May
2001 to May 2004. Mr. Wang received a Bachelors degree in Chinese Literature from the Culture University in Taiwan in 1955. Mr. Wang is also the Chairman of Sen Dah Investment Co., Ltd.



Mao-Chung Lin is a director of our company. Mr. Lin was a supervisor
of our company from May 2001 to May 2004. Mr. Lin received a Bachelors degree in Business Administration from the National Taiwan University in 1955. Mr. Lin is also the president of Sunrox International, Inc.



Paul S.C. Hsu is a director of our company. Professor Hsu received a
Ph.D. degree in Business Administration from The University of Michigan in 1974. Professor Hsu is Far East Group Chair Professor of Management, Yuan-Ze University, Taiwan, and the Chairman of Chinese Management Association. Mr. Hsu is a director of
Faraday Technology Corporation, Firich Enterprise Co., Ltd. and Taiwan Chi Cheng Enterprise Co. and a supervisor of Far Eastern International Bank.



Tzong-Yeong Lin was a supervisor of our company and, serving in the capacity of the representative of Chiao Tung Bank, resigned on May 25, 2005.
Mr. Lin holds a Masters degree in Law from National Taiwan University. Mr. Lin is the president of Mega Financial, the Chairman of The International Commercial Bank of China, Parawin Venture Capital Corp., Risklink Venture Capital Corp. and
International Investment Trust Co., Ltd. and a supervisor of Taian Technologies Corporation and National Credit Card Center of the ROC.



Tzyy Jang Tseng is a supervisor of our company. Mr. Tseng is a representative of Hsun Chieh Investment Co. Mr. Tseng received a Masters
degree in Physics from the National Tsing Hua University of Taiwan. Mr. Tseng is also the Chairman of Unimicron Technology and Subtron Technology Co., Ltd., and a supervisor of Fortune Venture Capital Corporation and a director of Premier Image
Technology Corporation.



Tsing-Yuan Hwang is a
supervisor of our company and a representative of Chuin Tsie Investment Co. Mr. Hwang was a director of our company from May 1998 to June 2004. Mr. Hwang received an MBA from the Nihon University in 1982. Mr. Hwang is also an executive officer of
Daiwa Securities SMBC Co., Ltd. and a director of President Chain Store Corp. and Hon Hai Precision Industry Co., Ltd.



Chris Chiis the business group president of our company. Mr. Chi was a director of our company from May 2001 to May 2004. Mr. Chi received a
Masters degree in Material Engineering from the University of California at Los Angeles. Prior to joining United Microelectronics in 1997, Mr. Chi was a senior vice president of Chartered Semiconductor Manufacturing Ltd. Mr. Chi is also a
director and the president of UMCi and a director of UMCJ.



Fu-Tai Liouis a business group president of our company. Dr. Liou was a director of our company from May 2001 to May 2004. Dr. Liou received a Ph.D. degree in Material Science and Engineering from the State University of New York at
Stony Brook in 1979. Prior to joining United Microelectronics in 1997, Dr. Liou was a vice president of SGS-Thompson.



Shih-Wei Sun is a senior vice president of our company and is in charge of our Research and Development Department. Mr. Sun holds a Ph.D. degree in
Electronics Materials from Northwestern University.



Stan
Hungis the Chief Financial Officer of our company. Mr. Hung was a director of our company from May 2001 to May 2004. Mr. Hung received a Bachelors degree in Accounting from TamKang University in 1982. Prior to joining United
Microelectronics in 1991, Mr. Hung was a manager at Unipac Optoelectronics Corporation. Mr. Hung is also a supervisor of SpringSoft Co., Ltd. and Novatek Microelectronics Corp., and a director of UMCJ, Hsun Chieh Investment Co., Ltd., Harvatek
Corp., Mega Financial Holding Company, United Microdisplay Optronics Corporation and Fortune Venture Capital Corporation.



|B. | Compensation
|-- | ------------



The aggregate compensation paid and benefits in kind granted to our directors and supervisors in 2004 were approximately NT$27 million (US$0.85 million).
Some of the remuneration were paid to the legal entities for which such directors or supervisors represent. The aggregate compensation paid and benefits in kind granted to our



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executive officers in 2004 were approximately NT$120 million, which include 2,800,000 shares as employee bonus and NT$15 million for housing and
transportation expenses. The number of shares distributed to our executive officers as employee bonus was calculated at the market value of NT$29.3 per share, which is the average market price in the last month of 2003, in accordance with ROC
SFBs disclosure requirement for annual report.



The
following table sets forth total compensation paid to each of our directors and supervisors in their respective capacities in 2004.



|                 |  |                                                                                   |  |                   
|---------------- |  | --------------------------------------------------------------------------------- |  | ------------------
|Name             |  | Capacity                                                                          |  | Total
Compensation
|                 |  |                                                                                   |  | (in NT$ thousands)
|                 |  |                                                                                  
|Robert H.C. Tsao |  | Chairman and managing director                                                    |  | 2,250             
|                 |  |                                                                                  
|John Hsuan       |  | Vice Chairman and managing director                                               |  | 2,250             
|                 |  |                                                                                  
|Peter Chang      |  | Vice Chairman and managing director (Representative of Hsun Chieh Investment Co.) |  | 2,250(1)          
|                 |  |                                                                                  
|Jackson Hu       |  | Director (Representative of Chuin Li Investment Co.)                              |  | 2,250(1)          
|                 |  |                                                                                  
|Hong-Jen Wu      |  | Director (Representative of Chuin Tsie Investment Co.)                            |  | 2,250(1)          
|                 |  |                                                                                  
|Ching-Chang Wen  |  | Director (Representative of Shieh Li Investment Co.)                              |  | 2,250(1)          
|                 |  |                                                                                  
|Jack K.C. Wang   |  | Director                                                                          |  | 2,250             
|                 |  |                                                                                  
|Mao-Chung Lin    |  | Director                                                                          |  | 2,250             
|                 |  |                                                                                  
|Paul S.C. Hsu    |  | Director                                                                          |  | 2,250             
|                 |  |                                                                                  
|Tzong-Yeong Lin  |  | Supervisor (Representative of Chaio Tung Bank Co., Ltd.)                          |  | 2,250(1)          
|                 |  |                                                                                  
|Tzyy Jang Tseng  |  | Supervisor (Representative of Hsun Chieh Investment Co.)                          |  | 2,250(1)          
|                 |  |                                                                                  
|Tsing-Yuan Hwang |  | Supervisor (Representative of Chuin Tsie Investment Co.)                          |  | 2,250(1)          

---

|(1) | Paid to legal entity for which individual served as representative.
|--- | -------------------------------------------------------------------



|C. | Board Practices
|-- | ---------------



All of our directors and supervisors were elected in June 2004 for a term of three years, except for SiS which was elected on June 13, 2005 for a term of
two years. Neither we nor any of our subsidiaries has entered into a contract with any of our directors and supervisors by which our directors or supervisors are expected to receive benefits upon termination of their employment.



Our board of directors established an audit committee in March 2005. The
audit committee is appointed by the board of directors and currently consists of Jack K.C.Wang, Mao-Chung Lin, and Paul S.C. Hsu. Each audit committee member is an independent director who is financially literate with accounting or related financial
management expertise. The audit committee meets as often as it deems necessary to carry out its responsibilities. Pursuant to an audit committee charter, the audit committee has responsibility for, among other things, overseeing the qualifications,
independence and performance of the Companys internal audit function and independent auditors, and overseeing the accounting policies and financial reporting and disclosure practices of the Company. The audit committee also has the authority
to engage special legal, accounting or other consultants it deems necessary in the performance of its duties.



In November 2003, the Securities and Exchange Commission approved changes to the NYSEs listing standards related to the corporate governance
practices of listed companies. Under these rules, listed foreign private issuers, like us, must disclose any significant ways in which their corporate governance practices differ from those followed by NYSE-listed U.S. domestic companies under the
NYSEs listing standards. A copy of the significant differences between our corporate governance practices and NYSE corporate governance rules applicable to U.S. companies is available on our website
http://www.umc.com/english/investors/Corp_gov_difference.asp.



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|D. | Employees
|-- | ---------



As of March 31, 2005, we had 10,493 employees, which included 4,904 engineers, 5,073 technicians and 516 clerical workers performing administrative
functions at our plants in Taiwan. We have in the past implemented, and may in the future evaluate the need to implement, labor redundancy plans based on the work performance of our employees.



|                     |  |                    |  |       |  |       
|-------------------- |  | ------------------ |  | ----- |  | ------
|                     |  | As of December 31,
|Employees            |  | 2002               |  | 2003  |  | 2004  
|Engineers            |  | 4,113              |  | 3,918 |  | 4,892 
|Technicians          |  | 4,478              |  | 4,469 |  | 5,230 
|Administrative Staff |  | 543                |  | 510   |  | 520   
|                     |  |                    |  |       |  |       
|Total                |  | 9,134              |  | 8,897 |  | 10,642
|                     |  |                    |  |       |  |       



Employee salaries are
reviewed annually. Salaries are adjusted based on industry standards, inflation and individual performance. As an incentive, additional bonuses in cash may be paid at the discretion of management based on the performance of individuals. In addition,
except under certain circumstances, ROC law requires us to reserve from 10% to 15% of any offerings of our new shares for employees subscription.



Our employees participate in our profit distribution pursuant to our articles of incorporation. Employees are entitled to receive additional bonuses based
on a certain percentage of our allocable surplus income. The amount allocated for employees in 2004 in relation to retained earnings in 2003 totaled NT$1,111 million (US$35 million), all of which were paid in the form of shares. The number of shares
issued as employee share bonus is calculated by valuing the shares at their par value, or NT$10 per share, rather than their fair market value. Accordingly, the value of the shares received by employees is significantly more than the cash amount
employees would receive if the employee share bonus was paid in cash. See Item 5. Operating and Financial Review and ProspectsB. Liquidity and Capital ResourcesUS GAAP Reconciliation.



Our employees are not covered by any collective bargaining agreements. We
believe we have a good relationship with our employees.



|E. | Share Ownership
|-- | ---------------



Each of our directors, supervisors and executive officers holds shares and/or ADSs of United Microelectronics, either directly for their own account or
indirectly as the representative of another legal entity on our board of directors. As of March 31, 2005, none of our directors, supervisors or executive officers held, for their own account, 1% or more of our outstanding shares. As of April 15,
2005, our most recent record date, Hsun Chieh Investment Co. held approximately 544 million of our shares, representing approximately 3.05% of our issued shares.



We have an Employee Stock Options Plan, pursuant to which options may be granted to our full-time regular employees,
including those of our domestic and overseas subsidiaries. The exercise price for the options would be the closing price of our common shares on the Taiwan Stock Exchange on the day the options are granted, while the expiration date for such options
is 6 years from the date of its issuance. In September 2002, October 2003 and September 2004, we obtained approvals from relevant ROC authorities for the grant of up to 1,000 million, 150 million and 150 million stock options, respectively, to
acquire our common shares under our Employee Stock Options Plan. In October 2002, January 2003, November 2003, March 2004, July 2004 and October 2004, we granted 939 million, 61 million, 57 million, 33 million, 57 million and 20 million stock
options, respectively, to our employees.



According to our
Employee Stock Options Plan, an option holder may exercise an increasing portion of his or her options starting two years after the grant of the options. According to the vesting schedule, 50%, 75% and 100% of such option holders options shall
vest two, three and four years after the grant of the options, respectively. Upon



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a voluntary termination or termination in accordance with the ROC Labor Law, the option holder shall exercise his or her vested options within 30 days,
subject to exceptions provided therein, and after the termination otherwise such options shall terminate. If termination was due to death, the heirs of such option holder have one year starting from the date of the death to exercise his or her
vested options. If termination was due to retirement or occupational casualty, the option holder or his or her heirs may exercise all his or her options within a certain period as provided. The options are generally not transferable or pledgeable by
the option holders.



The following table sets forth the stock
options held by each of our directors, supervisors and executive officers as of March 31, 2005.



|                 |  |                                                  |  |                          |  |                                          |  |                                   
|---------------- |  | ------------------------------------------------ |  | ------------------------ |  | ---------------------------------------- |  | ----------------------------------
|Name             |  | Number of Shares Issuableupon Exercise of Option |  | Per Share Exercise Price |  | Unit Granted/Total    Outstanding Shares |  | Expiration Date                   
|Robert H.C. Tsao |  |                                                 |  |                         |  |                                         |  |                                  
|                 |  |                                                  |  |                         
|John Hsuan       |  | 10,000,000                                       |  | 17.7                     |  | 0.06%                                    |  | October 7, 2008                   
|                 |  |                                                  |  |                         
|Peter Chang      |  | 10,000,000                                       |  | 17.7                     |  | 0.06%                                    |  | October 7, 2008                   
|                 |  |                                                  |  |                         
|Jackson Hu       |  | 5,000,000/15,000,000                             |  | 19.9/27.8                |  | 0.11%                                    |  | January 3, 2009/ November 26, 2009
|                 |  |                                                  |  |                         
|Hong-Jen Wu      |  | 10,000,000                                       |  | 17.7                     |  | 0.06%                                    |  | October 7, 2008                   
|                 |  |                                                  |  |                         
|Ching-Chang Wen  |  | 10,000,000                                       |  | 17.7                     |  | 0.06%                                    |  | October 7, 2008                   
|                 |  |                                                  |  |                         
|Jack K.C. Wang   |  |                                                 |  |                         |  |                                         |  |                                  
|                 |  |                                                  |  |                         
|Mao-Chung Lin    |  |                                                 |  |                         |  |                                         |  |                                  
|                 |  |                                                  |  |                         
|Paul S.C. Hsu    |  |                                                 |  |                         |  |                                         |  |                                  
|                 |  |                                                  |  |                         
|Tzong-Yeong Lin  |  |                                                 |  |                         |  |                                         |  |                                  
|                 |  |                                                  |  |                         
|Tzyy-Jang Tseng  |  |                                                 |  |                         |  |                                         |  |                                  
|                 |  |                                                  |  |                         
|Tsing-Yuan Hwang |  |                                                 |  |                         |  |                                         |  |                                  
|                 |  |                                                  |  |                         
|Chris Chi        |  | 10,000,000                                       |  | 17.7                     |  | 0.06%                                    |  | October 7, 2008                   
|                 |  |                                                  |  |                         
|Fu-Tai Liou      |  | 10,000,000                                       |  | 17.7                     |  | 0.06%                                    |  | October 7, 2008                   
|                 |  |                                                  |  |                         
|Shih-Wei Sun     |  | 8,000,000                                        |  | 17.7                     |  | 0.04%                                    |  | October 7, 2008                   
|                 |  |                                                  |  |                         
|Stan Hung        |  | 10,000,000                                       |  | 17.7                     |  | 0.06%                                    |  | October 7, 2008                   



|ITEM 7. | MAJOR SHAREHOLDERS AND RELATED PARTY TRANSACTIONS
|------- | -------------------------------------------------



|A. | Major Shareholders
|-- | ------------------



The following table sets forth information known to us with respect to the beneficial ownership of our shares as of (i) April 15, 2005, our most recent
record date and (ii) as of certain record dates in each of the preceding three years, for (1) the shareholders known by us to beneficially own more than 2% of our shares and (2) all directors, supervisors and executive officers as a group.
Beneficial ownership is determined in accordance with Securities and Exchange Commission rules.



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|                                                         |  |                                  |  |                                      |                    |  |                                       |                     |  |                                      |                     |  |                                        |  
|-------------------------------------------------------- |  | -------------------------------- |  | ------------------------------------ | ------------------ |  | ------------------------------------- | ------------------- |  | ------------------------------------ | ------------------- |  | -------------------------------------- | -
|                                                         |  | As of April 15, 2005             |  |                                      | As of April 3,2004 |  |                                       | As of April 11,2003 |  |                                      | As of April 5, 2002 | 
|Name of Beneficial Owner                                 |  | Number ofsharesbeneficiallyowned |  | Percentageof sharesbeneficiallyowned |                    |  | Percentage ofshares beneficiallyowned |                     |  | Percentageof sharesbeneficiallyowned |                     |  | Percentage of sharesbeneficially owned |  
|Hsun Chieh Investment Co., Ltd.(1)                       |  | 543,732,129                      |  | 3.05                                 | %                  |  | 3.12                                  | %                   |  | 3.13                                 | %                   |  | 3.16                                   | %
|Xilinx, Inc.                                             |  | 396,153,283                      |  | 2.22                                 | %                  |  | 2.27                                  | %                   |  | 2.28                                 | %                   |  | 2.30                                   | %
|Directors, supervisors and executive officers as a group |  | 1,132,452,750                    |  | 6.44                                 | %                  |  | 6.02                                  | %                   |  | 6.10                                 | %                   |  | 6.11                                   | %

---

|(1) | 99.97% owned by United Microelectronics as of March 31, 2005.
|--- | -------------------------------------------------------------



None of our major shareholders have different voting rights from those of our other shareholders. To the best of our knowledge, we are not directly or
indirectly controlled by another corporation, by any foreign government or by any other natural or legal person severally or jointly.



For information regarding our shares held or beneficially owned by persons in the United States, see Item 9. The Offer and ListingA. Offer and
Listing DetailsMarket Price Information for Our American Depositary Shares in this annual report.



|B. | Related Party Transactions
|-- | --------------------------



From time to time we have engaged in a variety of transactions with our affiliates. We generally conduct transactions with our affiliates on an
arms-length basis. The sales and purchase prices with related parties are determined through negotiation, generally based on market price. The prices of acquisition or disposal of buildings and facilities with related parties are determined by
fair market value, endorsed by an independent professional appraisal company.



In connection with the settlement of our litigations with SiS, we and SiS agreed in late 2002 to enter into a broad scope of cooperation, including, among other things, exchange of process patents, production support
and our board representation in SiS. Under the settlement, SiS also agreed to engage us as its sole external provider of foundry services for its integrated circuits designed with 0.18 micron or smaller processors. To further strengthen our
relationship with SiS, we decided to invest in SiS. As of March 31, 2005, we held 16.16% of SiS outstanding share capital. In addition, our representatives currently hold four out of seven board seats of SiS, and John Hsuan, our vice chairman, is
the chairman of SiS. In July 2004, we acquired SiSMC, a wafer foundry company spun off from SiS in 2003.



In 1997, United Microelectronics made initial investments as a founding shareholder in several fabless design companies, including AMIC Technology Inc.,
AMIC Technology (Taiwan) Inc., Broadmedia Inc. (which has been merged into C-Com Corporation in August 2003), DAVICOM Semiconductor (Taiwan), Inc., Integrated Telecom Express Inc. (which was liquidated in May 2003), Integrated Technology Express
Inc., MediaTek and Novatek, and received a majority interest in AMIC Technology Inc. and minority interests in the other companies. After the establishment of these companies, United Microelectronics sold in 1997 its semiconductor design equipment
and related assets to these companies at the fair market value of these assets. In December 2000, United Microelectronics sold all of its shares of AMIC Technology Inc. to AMIC Technology (Taiwan), Inc. In October 2003, we sold 17 million shares of
our equity interest in Novatek, and in 2003, we sold 9 million shares of our equity interest in MediaTek. In 2004, we sold 6 million shares of Novatek and 7 million shares of Mediatek. As of March 31, 2005, we held 16.56% and 8.76% in Novatek and
MediaTek, respectively.



The following table shows our
aggregate ownership interest in related fabless design companies that we enter into transactions from time to time as of March 31, 2005.



|                                 |  |           
|-------------------------------- |  | ----------
|Name                             |  | Ownership%
|AMIC Technology (Taiwan), Inc.   |  | 28.93     
|ITE Tech. Inc.                   |  | 22.23     
|Davicom Semiconductor, Inc.      |  | 21.56     
|Novatek Microelectronics Corp.   |  | 16.56     
|Silicon Integrated Systems Corp. |  | 16.16     
|MediaTek Inc.                    |  | 8.76      
|Holtek Semiconductor Inc.        |  | 25.23     



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We provide foundry services to these fabless design companies on arms-length prices and terms. We
derived NT$14,650 million, NT$15,278 million and NT$16,212 million (US$511 million) of our net operating revenues in 2002, 2003 and 2004, from the provision of our foundry services to these fabless design companies.



We purchased silicon wafers on arms-length prices and terms from
Shin-Etsu in the amount of NT$2,273 million, NT$2,699 million and NT$3,952 million (US$125 million) in 2002, 2003 and 2004. Currently, Fortune Venture Capital Corporation has one seat on the board of director of Shin-Etsu.



Chiao Tung Bank became a wholly-owned subsidiary of Mega Financial in 2002.
As of March 31, 2005, we had a 1.36% aggregate equity interest in Mega Financial, including the 0.52% equity interest held through Hsun Chieh. We have appointed Robert H.C. Tsao, one of our directors, to serve on the board of directors of Mega
Financial and Stan Hung, our Chief Financial Officer, to serve as a supervisor of Mega Financial. In addition, Tzong-Yeong Lin, who served in the capacity of the representative of Chiao Tung Bank as one of our supervisors, resigned on May 25, 2005.
In 2004, we paid off all of the loans in the amount of NT$283 million extended by Chiao Tung Bank.



|C. | Interests of Experts and Counsel
|-- | --------------------------------



Not applicable.



|ITEM 8. | FINANCIAL INFORMATION
|------- | ---------------------



|A. | Consolidated Statements and Other Financial Information
|-- | -------------------------------------------------------



Please refer to Item 18 for a list of all financial statements filed as part of this annual report on Form 20-F.



Except as described in Item 4. Information on the CompanyB.
Business OverviewLitigation, we are not currently involved in material litigation or other proceedings that may have, or have had in the recent past, significant effects on our financial position or profitability.



As for our policy on dividend distributions, see Item 10. Additional
InformationB. Memorandum and Articles of AssociationDividends and Distributions. The following table sets forth the cash dividends per share and stock dividends per share as a percentage of shares outstanding paid during each of
the years indicated in respect of shares outstanding at the end of each such year, except as otherwise noted. On June 13, 2005, our shareholders approved a stock dividend of NT$1 per share for an aggregate of 1,758,736,435 shares and a cash dividend
of NT$0.1 per share for an aggregate of NT$1,758,736,435.



|     |  |                        |  |                            |  |                                               |  |                                      
|---- |  | ---------------------- |  | -------------------------- |  | --------------------------------------------- |  | -------------------------------------
|     |  | Cash Dividend perShare |  | Stock Dividendper Share(1) |  | Total Number ofShares Issued asStock Dividend |  | Number ofOutstandingShares at YearEnd
|     |  | NT$                    |  | NT$                        |  |                                               |  |                                      
|1995 |  | 0.5                    |  | 5.0                        |  | 417,459,806                                   |  | 1,343,478,004                        
|1996 |  |                       |  | 9.3                        |  | 1,237,236,274                                 |  | 2,752,551,663                        
|1997 |  |                       |  | 3.0                        |  | 868,629,276                                   |  | 4,117,758,265                        
|1998 |  |                       |  | 2.9                        |  | 1,199,052,940                                 |  | 5,480,221,725                        
|1999 |  |                       |  | 1.5                        |  | 834,140,790                                   |  | 6,638,054,462                        
|2000 |  |                       |  | 2.0                        |  | 1,809,853,716                                 |  | 11,439,016,900                       
|2001 |  |                       |  | 1.5                        |  | 1,715,104,035                                 |  | 13,169,235,416                       
|2002 |  |                       |  | 1.5                        |  | 1,968,018,212                                 |  | 15,238,578,646                       
|2003 |  |                       |  | 0.4                        |  | 607,925,145                                   |  | 15,941,901,463                       
|2004 |  |                       |  | 0.8                        |  | 1,288,558,185                                 |  | 17,550,800,859                       

---

|(1) | We declare stock dividends in a NT dollar amount per share, but we pay the dividends to our shareholders in the form of shares. The amount of shares distributed to
each shareholder is calculated by multiplying the dividend declared by the number of shares held by the given shareholder, divided by the par value of NT$10 per share. Fractional shares are not issued but are paid in cash.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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|B. | Significant Changes
|-- | -------------------



There has been no significant subsequent events following the close of the last financial year up to the date of this annual report on Form 20-F that are
known to us and require disclosure in this annual report for which disclosure was not made in this annual report.



Our unconsolidated net operating revenues for the three months ended March 31, 2005 was NT$20,286 million (US$639 million). Our unconsolidated net
operating revenues for the three months ended March 31, 2005 is not indicative of the results that may be expected for any subsequent period.



|ITEM 9. | THE OFFER AND LISTING
|------- | ---------------------



|A. | Offer and Listing Details
|-- | -------------------------



Market Price Information for Our Shares



Our shares have been listed on the Taiwan Stock Exchange since July 1985. There is no public market outside Taiwan for our shares. The table below shows,
for the periods indicated, the high and low closing prices and the average daily volume of trading activity on the Taiwan Stock Exchange for our shares. The closing price for our shares on the Taiwan Stock Exchange on May 31, 2005 was NT$21.20 per
share.



|                                 |  |                            |  |                             |  |                        
|-------------------------------- |  | -------------------------- |  | --------------------------- |  | -----------------------
|                                 |  | Closing Price Per Share(1) |  | Average DailyTrading Volume
|                                 |  | High                       |  | Low                         | 
|                                 |  | NT$                        |  | NT$                         |  | (in thousands ofshares)
|2000                             |  | 70.12                      |  | 29.48                       |  | 98,343.40              
|2001                             |  | 40.64                      |  | 18.11                       |  | 82,638.91              
|2002                             |  | 44.12                      |  | 17.80                       |  | 85,641.45              
|2003                             |  | 29.81                      |  | 17.09                       |  | 109,409.47             
|First Quarter                    |  | 21.19                      |  | 17.09                       |  | 82,213.65              
|Second Quarter                   |  | 21.99                      |  | 17.18                       |  | 101,792.10             
|Third Quarter                    |  | 28.70                      |  | 20.56                       |  | 169,120.26             
|Fourth Quarter                   |  | 29.81                      |  | 25.65                       |  | 80,511.93              
|2004                             |  | 31.57                      |  | 19.40                       |  | 91,555.80              
|First Quarter                    |  | 31.57                      |  | 25.83                       |  | 110,902.58             
|Second Quarter                   |  | 31.48                      |  | 21.20                       |  | 118,943.21             
|Third Quarter                    |  | 23.90                      |  | 20.50                       |  | 74,446.71              
|Fourth Quarter                   |  | 21.70                      |  | 19.40                       |  | 63,909.12              
|December                         |  | 20.50                      |  | 19.80                       |  | 54,039.15              
|2005 (through June 15)           |  | 23.50                      |  | 17.85                       |  | 71,170.73              
|First Quarter                    |  | 21.00                      |  | 18.60                       |  | 78,363.66              
|January                          |  | 20.40                      |  | 18.90                       |  | 58,527.14              
|February                         |  | 21.00                      |  | 19.90                       |  | 144,867.43             
|March                            |  | 20.50                      |  | 18.60                       |  | 58,886.17              
|Second Quarter (through June 15) |  | 23.50                      |  | 17.85                       |  | 75,270.42              
|April                            |  | 19.15                      |  | 17.85                       |  | 42,618.65              
|May                              |  | 21.60                      |  | 18.40                       |  | 78,839.56              
|June (through June 15)           |  | 23.50                      |  | 21.15                       |  | 127,823.46             



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Source: Bloomberg; Taiwan Stock Exchange.

---

|(1) | Information has been adjusted to give effect to 1,809,853,716 shares and 78,689,291 shares issued as stock dividend and employee bonus, respectively, in June 2000;
1,715,104,035 shares and 149,139,481 shares issued as stock dividend and employee bonus, respectively, in August 2001; 1,968,018,212 shares and 171,132,018 shares issued as stock dividend and employee bonus, respectively, in August 2002; 607,925,145
shares and 57,972,672 shares issued as stock dividend and employee bonus, respectively, in July 2003; 1,288,558,185 shares and 111,127,354 shares issued as stock dividend and employee bonus, respectively, in July 2004.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Market Price Information for Our American Depositary Shares



Our ADSs have been listed on the NYSE under the symbol UMC since September 19, 2000. The outstanding ADSs are
identified by the CUSIP number 910873 20 7. The table below shows, for the periods indicated, the high and low closing prices and the average daily volume of trading activity on the NYSE for our ADSs. The closing price for our ADSs on the New York
Stock Exchange on May 31, 2005 was US$3.74 per ADS. Each of our ADSs represents the right to receive five shares.



|                                 |  |                         |  |                                 |  |          
|-------------------------------- |  | ----------------------- |  | ------------------------------- |  | ---------
|                                 |  | Closing Priceper ADS(1) |  | Average ADSDaily Trading Volume
|                                 |  | High                    |  | Low                             | 
|                                 |  | US$                     |  | US$                             |  |          
|2000 (from September 19)         |  | 10.07                   |  | 5.04                            |  | 2,385,428
|2001                             |  | 8.34                    |  | 3.50                            |  | 3,025,946
|2002                             |  | 8.88                    |  | 2.67                            |  | 4,055,687
|2003                             |  | 5.26                    |  | 2.65                            |  | 4,207,149
|First Quarter                    |  | 3.45                    |  | 2.65                            |  | 3,393,434
|Second Quarter                   |  | 3.85                    |  | 2.78                            |  | 4,669,908
|Third Quarter                    |  | 5.11                    |  | 3.39                            |  | 4,696,963
|Fourth Quarter                   |  | 5.26                    |  | 4.33                            |  | 4,037,379
|2004                             |  | 5.70                    |  | 3.25                            |  | 3,328,227
|First Quarter                    |  | 5.51                    |  | 4.56                            |  | 3,837,980
|Second Quarter                   |  | 5.70                    |  | 3.64                            |  | 3,419,102
|Third Quarter                    |  | 4.08                    |  | 3.34                            |  | 2,893,315
|Fourth Quarter                   |  | 3.86                    |  | 3.25                            |  | 3,176,540
|December                         |  | 3.64                    |  | 3.34                            |  | 2,707,615
|2005 (through June 15)           |  | 4.15                    |  | 3.10                            |  | 3,686,583
|First Quarter                    |  | 3.78                    |  | 3.16                            |  | 4,269,221
|January                          |  | 3.53                    |  | 3.16                            |  | 5,585,085
|February                         |  | 3.78                    |  | 3.51                            |  | 3,837,763
|March                            |  | 3.73                    |  | 3.18                            |  | 3,445,605
|Second Quarter (through June 15) |  | 4.15                    |  | 3.10                            |  | 3,016,000
|April                            |  | 3.35                    |  | 3.10                            |  | 2,073,005
|May                              |  | 3.76                    |  | 3.28                            |  | 2,679,548
|June (through June 15)           |  | 4.15                    |  | 3.79                            |  | 5,458,582



Sources: Bloomberg

---

|(1) | Information has been adjusted to give effect to 1,715,104,035 shares and 149,139,481 shares issued as stock dividend and employee bonus, respectively, in August
2001;1,968,018,212 shares and 171,132,018 shares issued as stock dividend and employee bonus, respectively, in August 2002; 607,925,145 shares and 57,972,672 shares issued as stock dividend and employee bonus, respectively, in July 2003;
1,288,558,185 shares and 111,127,354 shares issued as stock dividend and employee bonus, respectively, in July 2004.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



As of March 31, 2005, a total of 250,987,238 ADSs and 17,587,364,359 of our shares were outstanding. With certain limited exceptions, holders of shares
that are not ROC persons are required to hold these shares through a brokerage or custodial account in the ROC. As of March 31, 2005, 250,987,238 shares were registered in the name of a nominee of Citibank, N.A., the depositary under the deposit
agreement. Citibank, N.A. has advised us that, as of March 31, 2005, 250,987,238 ADSs, representing these 1,254,936,190 shares, were held of record by Cede & Co. and 39,452 other U.S. persons. We have no further information as to shares held, or
beneficially owned, by U.S. persons.



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|B. | Plan of Distribution
|-- | --------------------



Not applicable.



|C. | Markets
|-- | -------



The principal trading markets for our shares are the Taiwan Stock Exchange and the New York Stock Exchange, on which our shares trade in the form of ADSs.



|D. | Selling Shareholders
|-- | --------------------



Not applicable.



|E. | Dilution
|-- | --------



Not applicable.



|F. | Expenses of the Issue
|-- | ---------------------



Not applicable.



|ITEM 10. | ADDITIONAL INFORMATION
|-------- | ----------------------



|A. | Share Capital
|-- | -------------



Not applicable.



|B. | Memorandum and Articles of Association
|-- | --------------------------------------



The following statements summarize the material elements of our capital structure and the more important rights and privileges of shareholders
conferred by ROC law and our articles of incorporation.



Objects and
Purpose



The scope of business of United Microelectronics
as set forth in Article 2 of our articles of incorporation, includes (i) integrated circuits; (ii) semiconductor parts and components; (iii) parts and components of microcomputers, microprocessors, peripheral support and system products; (iv) parts
and components of semiconductor memory system products; (v) semiconductor parts and components for digital transceiver product and system products; (vi) semiconductor parts and components for telecom system and system products; (vii) testing and
packaging of integrated circuits; (viii) mask production; (ix) research and development, design, production, sales, promotion and after-sale services related to our business; and (x) export/import trade related to our business.



Directors



The ROC Company Act and our articles of incorporation provide that our board of directors is elected by shareholders and is
responsible for the management of our business. As of March 31, 2005, our board of directors consisted of 9 directors. In the annual ordinary shareholders meeting held in June 2004, we approved the reduction of the number of managing directors
from four to three by amending our articles of incorporation. Our current three managing directors are elected by our directors, and the Chairman of our board is elected by our managing directors. The Chairman presides at all meetings of our board
of directors, and also has the authority to represent our company. The term of office for our directors is three years, and our directors are elected by our shareholders by means of



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cumulative voting. The election for all of the directors and supervisors was held in June 2004. In addition, our articles
of incorporation provide that our shareholders also elect three supervisors whose duties include, among other things, investigating our business and financial condition, inspecting our corporate records, calling our shareholders meetings under
certain circumstances, representing us in negotiations with our directors and notifying, when appropriate, our board of directors to cease acting in contravention of applicable law or regulation or in contravention of our articles of incorporation.
The supervisors cannot concurrently serve as our directors or officers or employees. Pursuant to the ROC Company Act, a person may serve as our director or supervisor in his or her personal capacity or as the representative of another legal entity.
A legal entity that owns our shares may be elected as a director or supervisor, in which case a natural person must be designated to act as the legal entitys representative. A legal entity that is our shareholder may designate its
representative to be elected as our director or supervisor on its behalf. In the event several representatives are designated by the same legal entity, any or all of them may be elected. A director or supervisor who serves as the representative of a
legal entity may be removed or replaced at any time at the discretion of such legal entity, and the replacement director or supervisor may serve the remainder of the term of office of the replaced director or supervisor. Currently, four of our
directors and three of our supervisors are representatives of other legal entities, as shown in Item 6. Directors, Senior Management and Employees  A. Directors and Senior Management.



According to the Company Act, a director who has a personal interest in a
matter to be discussed at the meeting of the board of directors, the outcome of which may conflict with his interests, shall abstain from voting on such matter. Our articles of incorporation also provide that the compensation for all directors and
supervisors shall be determined at a shareholders meeting and at a comparable rate adopted by other companies of the same industry regardless of the profit received by our company. In addition, according to our articles of incorporation, we
may distribute 0.1% of the balance of our earnings after deduction of payment of all taxes and dues, deduction of any past losses and may allocate 10% of our net income as a legal reserve as remuneration to directors and supervisors. Our articles of
incorporation do not impose a mandatory retirement age limit for our directors. Furthermore, our articles of incorporation do not impose a shareholding qualification for each director; however, our articles of incorporation require that our
directors and supervisors in the aggregate shall own no less than 5% and 0.5%, respectively, of our issued shares. According to our current internal Loan Procedures, as amended in our annual shareholders meeting held in June 2005, we shall not
extend any loan to our directors or our supervisors.



Shares



As of December 31, 2004, our authorized share capital was NT$220 billion,
divided into 22 billion shares, of which 17,791,981,859 shares were issued and 17,550,800,859 shares were outstanding. All shares presently issued are fully paid and in registered form, and existing shareholders are not subject to any capital calls.
As of March 31, 2005, we had no outstanding convertible bonds, warrants or options on our shares, except for 930 million options we granted to our employees under our Employee Stock Options Plan as discussed below.



Employee Stock Option



According to our Employee Stock Options Plan, options may be granted to our full-time regular employees, including those of
our domestic and overseas subsidiaries. In September 2002, October 2003 and September 2004, we obtained approval by relevant ROC authorities to grant up to 1 billion, 150 million and 150 million stock options, respectively, to acquire our common
shares under our Employee Stock Option Plan. According to the plan, an option holder may exercise an increasing portion of his or her options in time starting two years after the grant of the options. According to the vesting schedule, 50%, 75% and
100% of such option holders options shall vest two, three and four years after the grant of the options, respectively.



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The table below shows the number of options granted in the past three years and the month in which they
were granted:



|                                                   |  |               |  |              |  |               |  |            |  |           |  |             
|-------------------------------------------------- |  | ------------- |  | ------------ |  | ------------- |  | ---------- |  | --------- |  | ------------
|                                                   |  | October 2002  |  | January 2003 |  | November 2003 |  | March 2004 |  | July 2004 |  | October 2004
|                                                   |  | (in millions)
|Number of Options Granted                          |  | 939           |  | 61           |  | 57            |  | 33         |  | 57        |  | 20          
|Number of Options Outstanding as of March 31, 2005 |  | 734           |  | 50           |  | 50            |  | 28         |  | 50        |  | 18          



New Shares and Preemptive Rights



New shares may only be issued with the prior approval of
our board of directors. If our issuance of any new shares will result in any change in our authorized share capital, we are required under ROC law to amend our articles of incorporation and obtain approval of our shareholders in a shareholders
meeting. We must also obtain the approval of, or submit a registration with, the ROC SFB and the Science Park Administration. According to the ROC Company Act, when a company issues capital stock for cash, 10% to 15% of the issue must be offered to
its employees. In addition, if a listed company intends to offer new shares for cash, at least 10% of the issue must also be offered to the public. This percentage can be increased by a resolution passed at a shareholders meeting, which will
reduce the number of new shares in which existing shareholders may have preemptive rights. Unless the percentage of the shares offered to the public is increased by a resolution, existing shareholders of the company have a preemptive right to
acquire the remaining 75% to 80% of the issue in proportion to their existing shareholdings. According to the Corporate Merger and Acquisition Act of the ROC, as effective on February 8, 2002, if new shares issued by our company are solely for the
purpose of acquisition or spin-off, the above-mentioned restrictions, including the employee stock ownership plan, the preemptive rights of the existing shareholders and the publicity requirement of a listed company, to such issuance of new shares
may not be applied.



Shareholders



We only recognize persons registered in our register as our shareholders. We
may set a record date and close our register of shareholders for specified periods to determine which shareholders are entitled to various rights pertaining to our shares.



Transfer of Shares



Shares in registered form are transferred in book-entry form or by endorsement and delivery of the related share certificates. Transferees must have their
names and addresses registered on our register in order to assert shareholders rights against us. Our shareholders are required to file their respective specimen seals with our share registrar, SinoPac Securities Corp. Under the current ROC
Company Act, a public company, such as our company, may issue individual share certificates, one master certificate or no certificate at all, to evidence common shares. Our articles of incorporation, as amended on June 13, 2005, provide that we,
upon acceptance of the application from the Taiwan Securities Central Depository Co., Ltd., or TSCDC, may issue a large face value share certificate in exchange for every thousand shares in the custody of TSCDC, or issue one master certificate for
all newly issued shares. If our shares are issued in one master certificate, the shares will be deposited for the custody of TSCDC, and the transfer of these shares will be carried out through the book-entry system maintained by TSCDC.



Shareholders Meetings



We are required to hold an annual ordinary shareholders meeting once
every calendar year within six months from the end of each fiscal year. Our board of directors may convene an extraordinary meeting whenever the directors deem necessary, and they must do so if requested in writing by shareholders holding no less
than 3% of our paid-in share capital who have held these shares for more than a year. In addition, any of our supervisors may convene a shareholders meeting if our board of directors does not or cannot convene a shareholders meeting and
when such a meeting is necessary for the benefit of the shareholders. At least 15 days advance written notice must



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be given of every extraordinary shareholders meeting and at least 30 days advance written notice must be
given of every annual ordinary shareholders meeting. Unless otherwise required by law or by our articles of incorporation, voting for an ordinary resolution requires an affirmative vote of a simple majority of those present. A distribution of
cash dividends would be an example of an ordinary resolution. The ROC Company Act also provides that in order to approve certain major corporate actions, including any amendment of our articles of incorporation, dissolution, merger or spin-off, the
transfer of all or an essential part of the business or assets, accept all of the business or assets of any other company which would have a significant impact in our operations, removing directors or the distribution of dividend in stock form, a
special resolution may be adopted by the holders of at least two-thirds of our shares represented at a meeting of shareholders at which holders of at least a majority of our issued and outstanding shares are present. However, if we are the
controlling company and hold no less than 90% of our subordinate companys outstanding shares, our merger with the subordinate company can be approved by a board resolution adopted by majority consent at a meeting with two-thirds of our
directors present without shareholders approval. In addition, according to the Corporate Merger and Acquisition Act of the ROC, if a company intends to transfer all or an essential part of its business or assets to its wholly-owned subsidiary,
subject to the qualifications set forth in the said act, such transaction only needs to be approved by majority board resolution rather than super majority vote by the shareholders meeting as required by the ROC Company Act.



Voting Rights



Due to the amendment to the Company Act and the amendment made to our articles of incorporation accordingly, except for
treasury shares, each common share is generally entitled to one vote and no voting discount will be applied. Except as otherwise provided by law or our articles of incorporation, a resolution can be adopted by the holders of a simple majority of the
total issued and outstanding shares represented at a shareholders meeting. The quorum for a shareholders meeting to discuss the ordinary resolutions is a majority of the total issued and outstanding shares. The election of directors and
supervisors by our shareholders may be conducted by means of cumulative voting or other voting mechanisms adopted in our articles of incorporation. In all other matters, a shareholder must cast all his or her votes in the same manner when voting on
any of these matters.



Our shareholders may be represented at
an ordinary or extraordinary shareholders meeting by proxy if a valid proxy form is delivered to us five days before the commencement of the ordinary or extraordinary shareholders meeting. Voting rights attached to our shares exercised
by our shareholders proxy are subject to the proxy regulation promulgated by the ROC SFB.



Any shareholder who has a personal interest in a matter to be discussed at our shareholders meeting, the outcome of which may impair our interests,
shall not vote or exercise voting rights on behalf of another shareholder on such matter.



Holders of our ADSs generally will not be able to exercise voting rights on the shares underlying their ADSs on an individual basis.



Dividends and Distributions



We are not allowed under ROC law to pay dividends on our treasury shares. We may distribute dividends on our issued and outstanding shares if we have
earnings. Before distributing a dividend to shareholders, among other things, we must recover any past losses, pay all outstanding taxes and set aside a legal reserve equivalent to 10% of our net income until our legal reserve equals our paid-in
capital.



At an annual ordinary shareholders meeting, our
board of directors submits to the shareholders for their approval proposals for the distribution of dividends or the making of any other distribution to shareholders from our net income or reserves for the preceding fiscal year. Dividends are paid
to shareholders proportionately. Dividends may be distributed either in cash or in shares or a combination of cash and shares, as determined by the shareholders at such meeting.



Our articles of incorporation provide that we may distribute 0.1% of the balance of our earnings deducted by:



| |  |  | payment of all taxes and dues;
| | - |  | ------------------------------



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| |  |  | deduction of any past losses; and
| | - |  | ---------------------------------



| |  |  | allocation of 10% of our net income as a legal reserve
| | - |  | ------------------------------------------------------



as remuneration to directors and supervisors.



The amount of no less than 5% of the residual amount after the distribution of the items illustrated above, plus any undistributed earnings from previous
years, shall be distributed as bonus to employees in the form of new shares. In the annual ordinary shareholders meeting held in June 2005, our shareholders approved an amendment of our articles of incorporation to enable the distribution of
employee bonus in the form of cash or in shares. Employees eligible for such distribution may include certain qualified employees from our subordinate companies and the qualification of such employees is to be determined by our board of directors.
The remaining amount may be distributed according to the distribution plan proposed by our board of directors based on our dividend policy, and submitted to the shareholders meeting for approval.



In the annual ordinary shareholders meeting held in June 2005, our
shareholders approved a change of the percentage of stock dividend issued to our shareholders, if any, to no more than 80% and cash dividend, if any, to no less than 20%.



In addition to permitting dividends to be paid out of net income, we are permitted under the ROC Company Act to make
distributions to our shareholders of additional shares by capitalizing reserves, including the legal reserve and capital surplus of premiums from issuing stock and earnings from gifts received if we do not have losses. However, the capitalized
portion payable out of our legal reserve is limited to 50% of the total accumulated legal reserve, and is payable only if and to the extent the accumulated legal reserve exceeds 50% of our paid-in capital.



For information as to ROC taxes on dividends and distributions, see
 E. TaxationROC Tax Considerations.



Acquisition of
Our Shares by Us



An ROC company may not acquire its own
common shares, except under certain exceptions provided in the ROC Company Act or the ROC Securities and Exchange Law. Under the new amendments to the ROC Company Act, which took effect on November 14, 2001, a company may purchase up to 5% of its
issued common shares for transfer to employees in accordance with a resolution of its board of directors, passed by a majority vote, at a meeting with at least two-thirds of the directors present.



Under Article 28-2, an amendment to the Securities and Exchange Law, which
took effect on July 21, 2000, we may, by a board resolution adopted by majority consent at a meeting with two-thirds of our directors present, purchase up to 10% of our issued shares on the Taiwan Stock Exchange or by a tender offer, in accordance
with the procedures prescribed by the ROC SFB, for the following purposes:



| |  |  | to transfer shares to our employees;
| | - |  | ------------------------------------



| |  |  | to transfer upon conversion of bonds with warrants, preferred shares with warrants, convertible bonds, convertible preferred shares or certificates of warrants issued by us; and
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | if necessary, to maintain our credit and our shareholders equity; provided that the shares so purchased shall be cancelled thereafter.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------



Prior to 2004, we announced several plans, none of which were binding on us,
to buy back up to an aggregate of 1,551 million of our shares on the Taiwan Stock Exchange at the price range set forth in the plans. As of December 31, 2003, we purchased an aggregate of 335 million of our shares under these plans, 186 million of
which were



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repurchased for transfer to our employees as permitted by the ROC Company Act and 149 million of which were repurchased
for the conversion of the convertible bonds. On March 23, 2004, we announced a plan, which was not binding on us, to buy back up to 360 million of our shares on the Taiwan Stock Exchange at a price range of NT$19.6 to NT$47.5 per share between March
24, 2004 and May 23, 2004. As of May 23, 2004, we purchased 192 million of our shares under the 2004 plan at an average purchase price of NT$27.06 per share. Of the repurchased shares, 137 million shares were transferred to our employees and 199
million shares were cancelled as of May 31, 2005. In addition, on May 13, 2005, we announced a plan which was not binding on us, to buy back up to 500 million of our shares on the Taiwan Stock Exchange at a price range of NT$13.75 to NT$28.45 per
share between May 16, 2005 and July 15, 2005.



In
addition, we may not spend more than the aggregate amount of the retained earnings, the premium from issuing stock and the realized portion of the capital reserve to purchase our shares.



We may not pledge or hypothecate any purchased shares. In addition, we may not exercise any shareholders rights
attaching to such shares. In the event that we purchase our shares on the Taiwan Stock Exchange, our affiliates, directors, supervisors, managers and their respective spouses and minor children and/or nominees are prohibited from selling any of our
shares during the period in which we purchase our shares.



In
addition to the share purchase restriction, the Company Act provides that our subsidiaries may not acquire our shares or the shares of our majority-owned subsidiaries if the majority of the outstanding voting shares or paid-in capital of such
subsidiary is directly or indirectly held by us.



Liquidation Rights



In a liquidation, you will be entitled to participate in
any surplus assets after payment of all debts, liquidation expenses and taxes.



Rights to Bring Shareholders Suits



Under the ROC Company Act, a shareholder may bring suit against us in the following events:



| |  |  | within 30 days from the date on which a shareholders resolution is adopted, a shareholder may file a lawsuit to annul a shareholders resolution if the procedure for
convening a shareholders meeting or the method of resolution violates any law or regulation or our articles of incorporation. However, if the court is of the opinion that such violation is not material and does not affect the result of the
resolution, the court may reject the shareholders claim.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | if the substance of a resolution adopted at a shareholders meeting contradicts any applicable law or regulation or our articles of incorporation, a shareholder may bring a
suit to determine the validity of such resolution.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Shareholders may bring suit against our directors and supervisors under the following circumstances:



| |  |  | Shareholders who have continuously held 3% or more of our issued shares for a period of one year or longer may request in writing that a supervisor institute an action against a
director on our behalf. In case the supervisor fails to institute an action within 30 days after receiving such request, the shareholders may institute an action on our behalf. In the event shareholders institute an action, a court may, upon the
defendants motion, order such shareholders to furnish appropriate security.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Shareholders who hold more than 3% or more of our total issued shares may institute an action with a court to remove a director of ours who has materially violated the applicable
laws or our articles of incorporation or has materially damaged the interests of our company if a resolution for removal on such grounds has first been voted on and rejected by our shareholders and such suit is filed within 30 days of such
shareholders vote.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | In the event that any director, supervisor, manager or shareholder holding more than 10% of our shares or any respective spouses or minor children and/or nominees of any of them
sells shares within six months after acquisition of such shares, or repurchases the shares within six months after the sale, we may claim for recovery of any profits realized from the sale and purchase. If our board of directors or our supervisors
fail to claim for recovery, any shareholder may set forth a 30-day period for our board of directors or our supervisors to exercise the right. In the event our directors or our supervisors fail to exercise the right during such 30-day period, such
requesting shareholder shall have the right to claim such recovery on our behalf. Our directors and supervisors shall be jointly and severally liable for damages suffered by us as a result of their failure to exercise the right of claim.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Other Rights of Shareholders



Under the ROC Company Act and the Corporate Merger and Acquisition Act,
dissenting shareholders are entitled to appraisal rights in the event of a spin-off or a merger and various other major corporate actions. Dissenting shareholders may request us to redeem all their shares at a then fair market price to be determined
by mutual agreement. If no agreement can be reached, the valuation will be determined by a court. Subject to applicable law, dissenting shareholders may, among other things, exercise their appraisal rights by notifying us before the related
shareholders meeting or by raising and registering their dissent at the shareholders meeting and also waive their voting rights.



One or more shareholders who have held more than 3% of the issued and outstanding shares for more than one year may require our board of directors to call
an extraordinary shareholders meeting by sending a written request to our board of directors.



Financial Statements



For a period of at least 10 days before our annual ordinary shareholders meeting, we must make available our annual financial statements at our principal offices in Hsinchu, Taiwan, and our share registrar in Taipei for our
shareholders inspection.



Transfer Restrictions



Our directors, supervisors, managers and shareholders holding more than 10%
of our shares are required to report any changes in their shareholding to us on a monthly basis. In addition, the number of shares that they can sell or transfer on the Taiwan Stock Exchange on a daily basis is limited by ROC law. Further, they may
sell or transfer our shares on the Taiwan Stock Exchange only after reporting to the ROC SFB at least three days before the transfer, provided that such reporting is not required if the number of shares transferred does not exceed 10,000.



|C. | Material Contracts
|-- | ------------------



Lease Agreements



For a
summary of our material leases, see Item 4. Information on the CompanyB. Business OverviewManufacturing Facilities.



Merger Agreement, dated as of February 26, 2004, between United Microelectronics Corporation and SiS Microelectronics Corporation



On February 26, 2004, we signed a merger agreement with SiSMC in connection
with our proposed acquisition of SiSMC through a share swap. Under the terms of the merger agreement, we issued 357 million new shares in exchange for 100% of SiSMC shares, at the ratio of one of our shares to 2.24 SiSMC shares, valuing the
acquisition at NT$10.7 billion. The acquisition is subject to a number of conditions, including obtaining approvals from Taiwan regulatory authorities, and was completed in July 2004.



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Cross License Agreement, dated as of January 1, 2004, between United Microelectronics Corporation and Agere Systems
Inc.



We entered into a five-year cross license agreement
with Agere effective as of January 1, 2004, which provides for the cross license of certain processes and topography. Under this agreement, Agere has granted to UMC and UMCs subsidiaries, nonexclusive, worldwide and non-transfereable licenses
for manufacturing inventions of certain semiconductive devices under Ageres patents filed prior to January 1, 2009, and UMC has granted Agere, royalty-free, worldwide and non-transferable licenses for manufacturing inventions of certain
semiconductive devices under UMCs patents filed prior to January 1, 2009.



|D. | Exchange Controls
|-- | -----------------



Foreign Investment and Exchange Controls in Taiwan



We have extracted from publicly available documents the information presented in this section. Please note that citizens of the Peoples Republic of China and entities organized in the Peoples Republic
of China are subject to special ROC laws, rules and regulations, which are not discussed in this section.



General



Historically,
foreign investments in the securities market of Taiwan were restricted. However, commencing in 1983, the Taiwan government has from time to time enacted legislation and adopted regulations to make foreign investment in the Taiwan securities market
possible. Initially, only overseas investment trust funds of authorized securities investment trust enterprises established in Taiwan were permitted to invest in the Taiwan securities market. Since January 1, 1991, qualified foreign institutional
investors are allowed to make investments in the Taiwan public securities market. Since March 1, 1996, non-resident foreign institutional and individual investors, called general foreign investors, are permitted to make direct
investments in the Taiwan public securities market. On September 30, 2003, the Executive Yuan amended the Regulations Governing Investment in Securities by Overseas Chinese and Foreign Nationals under which the Qualified Foreign Institutional
Investors, or QFII, designations have been abolished and the restrictions on foreign portfolio investors have been revised. According to the new rules, Foreign Institutional Investor, or FINI, means an entity which is incorporated
under the laws of countries other than the ROC or the branch of a foreign entity which is established within the territory of the ROC, and Foreign Individual Investor (FIDI) means an overseas Chinese or a foreign natural
person. In addition, the new rules also lifted some restrictions and simplified procedures of investment application.



Foreign Ownership Limitations



Foreign ownership of the issued share capital in a Taiwan Stock Exchange-listed company or a GreTai Securities Market-listed company has been limited to
50% in the past. Since December 30, 2000, the 50% limit has been lifted. Foreign investors can now hold such investments without any foreign ownership percentage limitations, unless the law has imposed restrictions otherwise.



Capital remitted into Taiwan under the foreign investment guidelines may be
repatriated at any time without the approval of the ROC SFB. Capital gains and income on investments may also be repatriated at any time.



Foreign Investors



Each FINI who wishes to invest directly in the ROC securities market is required to register with the Taiwan Stock Exchange and obtain an investment
identification number if the FINI is a non-resident and has no sub-investment accounts in the ROC. Except for some restrictions imposed by specific laws and regulations, the individual and aggregate foreign ownership of the issued share capital in a
Taiwan Stock Exchange-listed company or a GreTai Securities Market-listed company is not restricted. An ROC custodian for a non-resident FINI is required to submit to the Central Bank of China, or CBC, and the Taiwan Stock Exchange a report of
trading activities, inward and outward remittance of capital and status of assets under custody and other matters every month.



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Each FIDI who wishes to invest directly in the ROC securities market is also required to register with
the Taiwan Stock Exchange and obtain an investment identification number. Any non-resident FIDI who invests in the ROC securities market is subject to the limitations on investment amount as jointly determined by the ROC SFB and CBC.



Foreign Investment Approval



Foreign investors (both institutional and individual) who wish to make
direct investments in the shares of ROC companies are required to submit a foreign investment approval application to the Investment Commission of the Ministry of Economic Affairs of the ROC or other government authority and enjoy
benefits granted under the Statute for Foreigners Investment and the Statute for Overseas Chineses Investment. The Investment Commission or other government authority reviews each foreign investment approval application and approves or
disapproves the application after consultation with other governmental agencies, if necessary. Any non-ROC person possessing a foreign investment approval may repatriate annual net profits and interests attributable to an approved investment.
Investment capital and capital gains attributable to the investment may be repatriated with approval of the Investment Commission or other government authority.



In addition to the general restrictions against direct investments by foreign investors in ROC companies, foreign investors are currently prohibited
from investing in certain prohibited industries in Taiwan under the Negative List. The prohibition of the Negative List is absolute in the absence of a specific exemption from the application of the Negative List. The prohibition on
direct foreign investment in the prohibited industries is absolute in the absence of a specific exemption from the application of the Negative List. Under the Negative List, some other industries are restricted so that foreign investors may directly
invest only up to a specified level and with the specific approval of the relevant authority responsible for enforcing the legislation which the Negative List is intended to implement. Our business is not a restricted industry under the Negative
List.



Exchange Controls



Taiwans Foreign Exchange Control Statute and regulations provide that
all foreign exchange transactions must be executed by banks designed to handle foreign exchange transactions by the Ministry of Finance and by the Central Bank of China. Current regulations favor trade-related foreign exchange transactions.
Consequently, foreign currency earned from exports of merchandise and services may now be retained and used freely by exporters. All foreign currency needed for the importation of merchandise and services may be purchased from the designated foreign
exchange banks.



Aside from trade-related foreign exchange
transactions, ROC companies and residents may remit to and from Taiwan foreign currencies of up to US$50 million (or its equivalent) and US$5 million, (or its equivalent) respectively in each calendar year. These limits apply to remittances
involving a conversion between NT dollars and U.S. dollars or other foreign currencies. A requirement is also imposed on all private enterprises to register all medium and long-term foreign debt with the CBC.



In addition, foreign currency earned from or needed to be paid for direct
investment or portfolio investments, which are approved by the competent authorities, may be retained or sold by the investors or purchased freely from the designated bank.



Aside from the transactions discussed above, a foreign person without an alien resident card or an unrecognized foreign
entity may remit to and from Taiwan foreign currencies of up to US$100,000 per remittance without obtaining prior approval or permit if required documentation is provided to Taiwan authorities. This limit applies only to remittances involving a
conversion between NT dollars and U.S. dollars or other foreign currencies.



Depositary Receipts



In April 1992, the ROC
SFB began allowing ROC companies listed on the Taiwan Stock Exchange to sponsor the issuance and sale of depositary receipts evidencing depositary shares. Approvals for these issuances are still required. In December 1994, the Ministry of Finance
began allowing companies whose shares are traded on the



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GreTai Securities Market to sponsor the issuance and sale of depositary receipts evidencing depositary shares. On October 24, 2002, the ROC SFB began
allowing public companies that are not listed on the Taiwan Stock Exchange or the GreTai Securities Market to sponsor the issuance and sale of depositary receipts by way of private placements outside the ROC.



A holder of depositary shares wishing to withdraw common shares underlying
depositary shares is required to appoint a local agent or representative with qualifications set forth by the ROC SFB to, among other things, open a securities trading account with a local brokerage firm, pay ROC taxes, remit funds, and exercise
shareholders right. In addition, the withdrawing holder is also required to appoint a custodian bank with qualifications set forth by the Ministry of Finance to hold the securities in safekeeping, make confirmations, settle trades and report
all relevant information. Without making this appointment and the opening of accounts, the withdrawing holder would be unable to subsequently sell the common shares withdrawn from a depositary receipt facility on either the Taiwan Stock Exchange or
the GreTai Securities Market.



After the issuance of a
depositary share, a holder of the depositary share may immediately, comparing to a three-month waiting period restriction which was lifted in 2003, request the depositary issuing the depositary share to cause the underlying common shares to be sold
in the ROC or to withdraw the common shares represented by the depositary receipt and deliver the common shares to the holder. Citizens of the PRC are not permitted to withdraw and hold our common shares unless they obtain the approval from the
competent authority. Due to the absence of relevant rules or guidelines, PRC persons are not currently able to conduct investments in the ROC.



No deposits of shares may be made in a depositary receipt facility and no depositary receipts may be issued against deposits without specific ROC SFB
approval, unless they are:



| | (1) | stock dividends;
| | --- | ----------------



| | (2) | free distributions of common shares;
| | --- | ------------------------------------



| | (3) | due to the exercise by a holder of his or her preemptive rights in the event of capital increases for cash; or
| | --- | --------------------------------------------------------------------------------------------------------------



| | (4) | permitted under the deposit agreement and the custody agreement, due to the direct purchase of shares or purchase through the depositary in the domestic market or the surrender of
shares withdrawn by and under the possession of investors and then delivery of such shares to the custodian for deposit in the depositary receipt facility, provided that the total number of depositary receipts outstanding after an issuance cannot
exceed the number of issued depositary shares previously approved by the ROC SFB in connection with the offering plus any depositary shares issued pursuant to the events described in (1), (2) and (3) above. These issuances may only be made to the
extent previously issued depositary shares have been withdrawn.
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



A depositary may convert New Taiwan dollars from the proceeds of the sale of common shares or cash distributions received into other currencies, including U.S. dollars. A depositary must obtain foreign exchange
approval from the Central Bank of China on a payment-by-payment basis for conversion into New Taiwan dollars of subscription payments for rights offerings or conversion into foreign currencies from the proceeds from the sale of subscription rights
for new common shares. It is expected that the Central Bank of China will grant this approval as a routine matter.



A holder of depositary shares may convert NT dollars into other currencies from proceeds from the sale of any underlying common shares. Proceeds from the
sale of the underlying common shares withdrawn from the depositary receipt facility may be used for reinvestment in securities listed on both the Taiwan Stock Exchange and the GreTai Securities Market, provided that the investor designates a local
securities firm or financial institution as agent to open an NT dollar bank account in advance.



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|E. | Taxation
|-- | --------



ROC Tax Considerations



The following summarizes the principal ROC tax consequences of owning and disposing of the ADSs and shares to a holder of ADSs or shares that is not a resident of the ROC. An individual holder will be considered as not a resident of the ROC
for the purposes of this section if he or she is not physically present in Taiwan for 183 days or more during any calendar year, except if the individual holder has both ROC and non-ROC nationalities and has a registered address in the ROC. An
entity holder will be considered as not a resident of the ROC if it is organized under the laws of a jurisdiction other than Taiwan and has no fixed place of business or other permanent establishment in the ROC. Prospective purchasers of ADSs should
consult their own tax advisors concerning the tax consequences of owning ADSs or shares in the ROC and any other relevant taxing jurisdiction to which they are subject.



Dividends



Dividends, whether in cash or shares, declared by us out of retained earnings and paid out to a holder that is not an ROC resident in respect of shares
represented by ADSs are subject to ROC withholding tax at the time of distribution. The current rate of withholding for non-residents is 30% for a non-resident individual and 25% for a non-resident entity of the amount of the distribution in the
case of cash dividends or of the par value of the shares distributed in the case of stock dividends. However, the rate of withholding is 20% if the non-resident holder obtains foreign investment approval pursuant to the Statute for Foreigners
Investment or the Statute for Overseas Chineses Investment. Under current practice adopted by tax authorities, a 20% withholding rate is applied to a non-resident ADS holder without requiring the holder to apply for or obtain foreign
investment approval. As discussed in the section Tax Reform below, certain of our retained earnings will be subject to a 10% undistributed retained earnings tax. To the extent dividends are paid out of retained earnings which have
been subject to the retained earnings tax, the amount of such tax will be used by us to offset a non-residents withholding tax liability on such dividend. Consequently, the effective rate of withholding on dividends paid out of retained
earnings previously subject to the retained earnings tax may be less than 20%. There is no withholding tax with respect to stock dividends declared out of our capital reserve.



Capital Gains



Under current ROC law, gains realized on ROC securities transactions are exempt from income tax. In addition, transfers of ADSs by non-resident holders
are not regarded as sales of ROC securities and, as a result, any gains derived therefrom are currently not subject to ROC income tax.



Securities Transaction Tax



The ROC government imposes a securities transaction tax that will apply to sales of shares, but not to sales of ADSs. The transaction tax, which is
payable by the seller, is generally levied on sales of shares at the rate of 0.3% of the sales proceeds. Withdrawals of our shares from our depositary facility are not subject to the ROC security transaction tax.



Preemptive Rights



Distribution of statutory preemptive rights for shares in compliance with
the ROC Company Act is not subject to ROC tax. Proceeds derived from sales of statutory preemptive rights evidenced by securities by a non-resident holder may be subject to the ROC securities transaction tax, currently at the rate of 0.3% of the
gross amount received. Proceeds derived from sales of statutory preemptive rights which are not evidenced by securities are subject to capital gains tax at the rate of (1) 25% of the gains realized for non-ROC entity holders and (2) 35% of the gains
realized for non-ROC individual holders. Subject to compliance with the ROC law, we have sole discretion to determine whether statutory preemptive rights are evidenced by securities or not.



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Estate Taxation and Gift Tax



ROC estate tax is payable on any property within the ROC of a deceased individual who is a non-resident individual and ROC
gift tax is payable on any property located within the ROC donated by any such person. Estate tax is currently payable at rates ranging from 2% of the first NT$600,000 to 50% of amounts over NT$100,000,000. Gift tax is payable at rates ranging from
4% of the first NT$600,000 to 50% of amounts over NT$45,000,000. Under ROC estate and gift tax laws, the shares will be deemed located in the ROC irrespective of the location of the owner. It is unclear whether a holder of ADSs will be considered to
own shares for this purpose.



Tax Treaties



At present, Taiwan has income tax treaties with Indonesia, Singapore,
Australia, New Zealand, Gambia, Swaziland, Malaysia, Vietnam, Macedonia, the Netherlands, South Africa, the United Kingdom, Senegal and Sweden. It is unclear whether a non-ROC holder will be considered to own shares for the purposes of such
treaties. Accordingly, a holder of ADSs who is otherwise entitled to the benefit of a treaty should consult its own tax advisors concerning eligibility for benefits under the treaty with respect to the ADSs.



Tax Reform



In order to increase Taiwans competitiveness, an amendment to the ROC Income Tax law was enacted on January 1, 1998,
to integrate the corporate income tax and the shareholder dividend tax with the aim of eliminating the double taxation effect for resident shareholders of Taiwanese corporations.



Under this amendment, a 10% retained earnings tax will be imposed on a company for its after-tax earnings generated after
January 1, 1998 which are not distributed in the following year. The retained earnings tax so paid will further reduce the retained earnings available for future distribution. When the company declares dividends out of those retained earnings, up to
a maximum amount of 10% of the declared dividends will be credited against the 20% withholding tax imposed on the non-resident holders of its shares.



U.S. Federal Income Tax Considerations For U.S. Persons



The following is a summary of the material U.S. federal income tax consequences for beneficial owners of our shares or ADSs, that hold the shares or ADSs
as capital assets and that are U.S. holders that are not citizens of the ROC, do not have a permanent establishment in the ROC and are not physically present in the ROC for 183 days or more within a calendar year. You are a U.S. holder if you are:



| |  |  | An individual citizen or resident of the United States;
| | - |  | -------------------------------------------------------



| |  |  | a corporation (or other entity treated as a corporation for U.S. federal income tax purposes) or partnership created or organized in or under the laws of the United States or any
political subdivision thereof;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | an estate the income of which is subject to U.S. federal income taxation regardless of its source;
| | - |  | --------------------------------------------------------------------------------------------------



| |  |  | a trust that is subject to the primary supervision of a court within the United States and one or more U.S. persons have authority to control all substantial decisions of the trust;
or
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | a trust that has a valid election in effect under applicable U.S. Treasury regulations to be treated as a U.S. person.
| | - |  | ----------------------------------------------------------------------------------------------------------------------



This summary is based on current law, which is subject to change, perhaps
retroactively. It is for general purposes only and you should not consider it to be tax advice. In addition, it is based in part on representations by the depositary and assumes that each obligation under the deposit agreement and any related
agreement will be performed in accordance with their terms. This summary does not represent a detailed description of all the U.S. federal income tax consequences to you in light of your particular circumstances. In addition, it does not represent a



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detailed description of the U.S. federal income tax consequences applicable to you if you are subject to special treatment under the U.S. federal income tax
laws, including if you are:



| |  |  | a dealer in securities or currencies;
| | - |  | -------------------------------------



| |  |  | a trader in securities if you elect to use a mark-to-market method of accounting for your securities holdings;
| | - |  | --------------------------------------------------------------------------------------------------------------



| |  |  | a financial institution or an insurance company;
| | - |  | ------------------------------------------------



| |  |  | a tax-exempt organization;
| | - |  | --------------------------



| |  |  | a regulated investment company;
| | - |  | -------------------------------



| |  |  | a real estate investment trust;
| | - |  | -------------------------------



| |  |  | a person liable for alternative minimum tax;
| | - |  | --------------------------------------------



| |  |  | a person holding shares as part of a hedging, integrated or conversion transaction, constructive sale or straddle;
| | - |  | ------------------------------------------------------------------------------------------------------------------



| |  |  | a person owning, actually or constructively, 10% or more of our voting stock; or
| | - |  | --------------------------------------------------------------------------------



| |  |  | a U.S. holder whose functional currency is not the United States dollar.
| | - |  | --------------------------------------------------------------------------



We cannot assure you that a later change in law will not alter significantly the tax considerations that we describe in this
summary.



If a partnership holds our shares or ADSs, the tax
treatment of a partner will generally depend upon the status of the partner and the activities of the partnership. If you are a partner of a partnership holding our shares or ADSs, you should consult your tax advisor.



You should consult your own tax advisor concerning the particular U.S.
federal income tax consequences to you of the ownership and disposition of the shares or ADSs, as well as the consequences to you arising under the laws of any other taxing jurisdiction.



In general, for U.S. federal income tax purposes, a U.S. person who is the
beneficial owner of an ADS will be treated as the owner of the shares underlying its ADS. Accordingly, deposits or withdrawals of shares by U.S. holders for ADSs generally will not be subject to U.S. federal income tax. However, the U.S. Treasury
has expressed concerns that parties involved in transactions in which ADSs are pre-released may be taking actions that are inconsistent with the claiming of foreign tax credits by the U.S. holders of ADSs. Such actions would also be inconsistent
with the claiming of the reduced rate of tax, described below, applicable to dividends received by certain non-corporate holders. Accordingly, the analysis of the creditability of ROC taxes described below could be affected by future actions that
may be taken by the U.S. Treasury. Deposits or withdrawals of shares by U.S. holders for ADSs generally will not be subject to U.S. federal income tax.



Taxation of Dividends



Except as discussed below with respect to the passive foreign investment company rules, the amount of distributions (including net amounts withheld in
respect of ROC withholding taxes) you receive on your shares or ADSs (other than certain pro rata distributions of shares to all shareholders) will generally be treated as dividend income to you if the distributions are made from our current and
accumulated earnings and profits as calculated according to U.S. federal income tax principles. In determining the net amounts withheld in respect of ROC taxes, any reduction in the amount withheld on account of an ROC credit in respect of the 10%
retained earnings tax imposed on us is not considered a withholding tax and will not be treated as distributed to you or creditable by you



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against your U.S. federal income tax. Such income will be includible in your gross income as ordinary income on the day you actually or constructively
receive it, which in the case of an ADS will be the date actually or constructively received by the depositary. The amount of any distribution of property other than cash will be the fair market value of such property on the date it is distributed.
You will not be entitled to claim a dividend received deduction with respect to distributions you receive from us.



With respect to non-corporate U.S. holders, certain dividends received from a qualified foreign corporation in taxable years beginning prior to January 1,
2009 may be subject to reduced rates of taxation. A foreign corporation is a qualified foreign corporation with respect to dividends paid by that corporation on shares (or ADSs backed by such shares) that are readily tradable on an established
securities market in the United States U.S. Treasury guidance indicates that our ADSs (which are listed on the NYSE) but not our shares are readily tradable on an established securities market in the United States. Thus, we do not believe that
dividends we pay on our shares that are not backed by ADSs currently meet the conditions required for these reduced tax rates. There can be no assurance that our ADSs will continue to be readily tradable on an established securities market in later
years. Non-corporate U.S. holders that do not meet a minimum holding period requirement during which they are not protected from the risk of loss or that elect to treat the dividend income as investment income pursuant to section
163(d)(4) of the Internal Revenue Code of 1986, as amended (the Code) will not be eligible for the reduced rates of taxation regardless of our status as a qualified foreign corporation. In addition, the rate reduction will not apply to
dividends if the recipient of a dividend is obligated to make related payments with respect to positions in substantially similar or related property. This disallowance applies even if the minimum holding period has been met. Holders should consult
their own tax advisors regarding the application of these rules given their particular circumstances.



The amount of any dividend paid in NT dollars will equal the U.S. dollar value of the NT dollars you receive, calculated by reference to the exchange rate
in effect on the date you actually or constructively receive the dividend, which in the case of an ADS will be the date actually or constructively received by the depositary, regardless of whether the NT dollars are actually converted into U.S.
dollars. If the NT dollars received as a dividend are not converted into U.S. dollars on the date of receipt, you will have a basis in the NT dollars equal to their U.S. dollar value on the date of receipt. Any gain or loss you realize if you
subsequently sell or otherwise dispose of the NT dollars will be ordinary income or loss from sources within the United States for foreign tax credit limitation purposes.



Subject to certain limitations under the Code, you may be entitled to a credit or deduction against your U.S. federal income
taxes for the net amount of any ROC taxes that are withheld from dividend distributions made to you. The election to receive a credit or deduction must be made annually, and applies to all foreign taxes for the applicable tax year. The limitation on
foreign taxes eligible for credit is calculated separately with respect to specific classes of income. For this purpose, dividends we pay with respect to shares or ADS will generally be considered passive income or, for certain holders,
 financial services income. You may be subject to special rules if your foreign source income during the taxable year consists entirely of qualified passive income and if you have US$300 or less, or US$600 or less if you file
a joint return, of creditable foreign taxes which you have paid or accrued during the taxable year. Furthermore, you will not be allowed a foreign tax credit for foreign taxes imposed on dividends paid on shares or ADSs if you (1) have held shares
or ADSs for less than a specified minimum period during which you are not protected from risk of loss, or (2) are obligated to make payments related to the dividends. The rules governing the foreign tax credit are complex. We therefore urge you to
consult your tax advisor regarding the availability of the foreign tax credit under your particular circumstances.



To the extent that the amount of any distribution you receive exceeds our current and accumulated earnings and profits for a taxable year, the
distribution will first be treated as a tax-free return of capital, causing a reduction in your adjusted basis in the shares or ADSs and thereby increasing the amount of gain, or decreasing the amount of loss, you will recognize on a subsequent
disposition of the shares or ADSs. The balance in excess of adjusted basis, if any, will be taxable to you as capital gain recognized on a sale or exchange.



It is possible that pro rata distributions of shares to all shareholders may be made in a manner that is not subject to U.S. federal income tax. In the
event that such distributions are tax-free, the basis of any new shares so received will be determined by allocating the U.S. holders basis in the old shares between the old shares and the new shares, based on their relative fair market values
on the date of distribution. For U.S. tax purposes, any such tax-free share distribution and any distributions in excess of current and accumulated earnings and profits and distributions of



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shares generally would not result in foreign source income to you. Consequently, you may not be able to use the foreign tax credit associated with any ROC
withholding tax imposed on such distributions unless you can use the credit against U.S. tax due on other foreign source income in the appropriate category for foreign tax credit purposes. You should consult your own tax advisors regarding all
aspects of the foreign tax credit.



Taxation of Capital Gains



Except as discussed below with respect to the passive
foreign investment company rules, when you sell or otherwise dispose of your shares or ADSs, you will recognize capital gain or loss in an amount equal to the difference between the U.S. dollar value of the amount realized for the shares or ADSs and
your basis in the shares or ADSs, determined in U.S. dollars. If you are an individual, and the shares or ADSs being sold or otherwise disposed of are capital assets that you have held for more than one year, your gain recognized will be taxed at a
maximum rate of 15%. Your ability to deduct capital losses is subject to limitations. Any gain or loss you recognize will generally be treated as U.S. source gain or loss.



If you pay any ROC securities transaction tax, such tax is not treated as an income tax for U.S. federal income tax
purposes, and therefore will not be a creditable foreign tax for U.S. federal income tax purposes. However, subject to limitations under the Code, such tax may be deductible. You are urged to consult your tax advisors regarding the U.S. federal
income tax consequences of these taxes.



Passive Foreign Investment
Company



Based on the projected composition of our
income and valuation of our assets, including goodwill, we do not believe that we are currently (or that we were in 2004) a passive foreign investment company (PFIC) and we do not expect to become one in the future, although there can be
no assurance in this regard.



In general, a company is
considered a PFIC for any taxable year if either:



| |  |  | at least 75% of its gross income is passive income, which is income derived from certain dividends, interest, royalties, rents, annuities or property transactions; or
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | at least 50% of the value of its assets is attributable to assets that produce or are held for the production of passive income.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------



The 50% of value test is based on the average of the value of our assets for
each quarter during the taxable year. If we own at least 25% by value of another companys stock, we will be treated, for purposes of the PFIC rules, as owning our proportionate share of the assets and receiving our proportionate share of the
income of that company.



In determining that we do not expect
to be a PFIC, we are relying on our projected capital expenditure plans and projected revenues for the current year and for future years. In addition, our determination is based on a current valuation of our assets, including goodwill. In
calculating goodwill, we have valued our total assets based on our total market value, which is based on the market value of our shares and is subject to change. In addition, we have made a number of assumptions regarding the allocation of goodwill
to active and passive assets. We believe our valuation approach is reasonable. However, it is possible that the Internal Revenue Service will challenge the valuation or allocation of our goodwill, which may also result in us being classified as a
PFIC.



In addition, the determination of whether we are a PFIC
is made annually. Accordingly, it is possible that we may become a PFIC in the current or any future taxable year due to changes in our asset or income composition. Because we have valued our goodwill based on the market value of our shares, a
decrease in the price of our shares may result in our becoming a PFIC.



If we are a PFIC for any taxable year during which you hold shares or ADSs, you will be subject to special tax rules with respect to any excess distribution that you receive and any gain you realize from a sale or other
disposition (including a pledge) of shares or ADSs. Distributions you receive in a taxable year that are greater than



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125% of the average annual distributions you received during the shorter of the three preceding taxable years or your holding period for shares or ADSs will
be treated as excess distributions. Under these special tax rules:



| |  |  | the excess distribution or gain will be allocated ratably over your holding period for shares or ADSs;
| | - |  | ------------------------------------------------------------------------------------------------------



| |  |  | the amount allocated to the current taxable year, and any taxable year prior to the first taxable year in which we were a PFIC, will be treated as ordinary income; and
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the amount allocated to each other year will be subject to tax at the highest tax rate in effect for that year and the interest charge generally applicable to underpayments of tax
will be imposed on the resulting tax attributable to each such year.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



If you hold shares or ADSs in any year in which we are a PFIC, you are required to file Internal Revenue Service Form 8621.



In certain circumstances, a U.S. holder, in lieu of being subject to the PFIC rules discussed above, may make an election to include gain on the stock of
a PFIC as ordinary income under a mark-to-market method provided that such stock is regularly traded on a qualified exchange. Under this method, any difference between the stocks fair market value and its adjusted basis at the end of the year
is accounted for by either an inclusion in income or a deduction from income. Under current law, the mark-to-market election may be available to holders of ADSs because the ADSs will be listed on the NYSE, which constitutes a qualified exchange as
designated in the Internal Revenue Code, although there can be no assurance that the ADSs will be regularly traded for purposes of the mark-to-market election. You should also note that it is intended that only the ADSs and not the shares will be
listed on the NYSE. Our shares are listed on the Taiwan Stock Exchange, which must meet certain trading, listing, financial disclosure and other requirements to be treated as a qualified exchange under applicable U.S. Treasury regulations for
purposes of the mark-to-market election, and no assurance can be given that the shares will be regularly traded for purposes of the mark-to-market election.



If you make an effective mark-to-market election, you will include in income each year as ordinary income the excess of the
fair market value of your PFIC shares or ADSs at the end of the year over your adjusted tax basis in the shares. You will be entitled to deduct as an ordinary loss each year the excess of your adjusted tax basis in the shares or ADSs over their fair
market value at the end of the year, but only to the extent of the net amount previously included in income as a result of the mark-to-market election.



Your adjusted tax basis in PFIC shares or ADSs will be increased by the amount of any income inclusion and decreased by the amount of any deductions under
the mark-to-market rules. If you make a mark-to-market election it will be effective for the taxable year for which the election is made and all subsequent taxable years unless the shares or ADSs cease to be PFIC stock that is regularly traded on a
qualified exchange or the Internal Revenue Service consents to the revocation of the election. You should consult your tax advisor about the availability of the mark-to-market election, and whether making the election would be advisable in your
particular circumstances.



Alternatively, a U.S. holder of
shares or ADSs in a PFIC can sometimes avoid the rules described above by electing to treat the company as a qualified electing fund under section 1295 of the Internal Revenue Code. This option is not available to you because we do not
intend to comply with the requirements necessary to permit you to make this election.



U.S. holders who are individuals will not be eligible for reduced rates of taxation on any dividends received from us in taxable years beginning prior to January 1, 2009, if we are a PFIC in the taxable year in which
such dividends are paid or in the preceding taxable year. You should consult your own tax advisors concerning the U.S. federal income tax consequences of holding shares or ADSs if we are considered a PFIC in any taxable year.



Information Reporting and Backup Withholding



In general, unless you are an exempt recipient such as a corporation,
information reporting will apply to dividends in respect of the shares or ADSs and to the proceeds from the sale of your shares or ADSs paid within the



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United States (and in some cases, outside of the United States). Additionally, if you fail to provide your taxpayer identification number, or fail either to
report in full dividend and interest income or to make the necessary certifications, you will be subject to backup withholding.



Any amounts withheld under the backup withholding rules will be allowed as a refund or a credit against your U.S. federal income tax liability, provided
you furnish the required information to the Internal Revenue Service.



Inheritance and Gift Tax



The ROC
imposes an estate tax on a decedent who owns shares, and possibly ADSs, even if the decedent was not a citizen or resident of the ROC. See ROC Tax Considerations. The amount of any inheritance tax paid to the ROC may be eligible
for credit against the amount of U.S. federal estate tax imposed on your estate or heirs. You should consult your personal tax advisors to determine whether and to what extent you may be entitled to such credit.



The ROC also imposes a gift tax on the donation of any property located
within the ROC. Under present law, a comparable U.S. tax credit for foreign gift taxes (such as those imposed by the ROC) is not available.



|F. | Dividends and Paying Agents
|-- | ---------------------------



Not applicable.



|G. | Statement by Experts
|-- | --------------------



Not applicable.



|H. | Documents on Display
|-- | --------------------



We have filed this annual report on Form 20-F, including exhibits, with the Securities and Exchange Commission. As allowed by the Securities and Exchange
Commission, in Item 19 of this annual report, we incorporate by reference certain information we filed with the Securities and Exchange Commission. This means that we can disclose important information to you by referring you to another document
filed separately with the Securities and Exchange Commission. The information incorporated by reference is considered to be part of this annual report.



You may read and copy this annual report, including the exhibits incorporated by reference in this annual report, at the Securities and Exchange
Commissions Public Reference Room at 450 Fifth Street, N.W., Washington, D.C. 20549 and at the Securities and Exchange Commissions regional offices in New York, New York and Chicago, Illinois. You can also request copies of this annual
report, including the exhibits incorporated by reference in this annual report, upon payment of a duplicating fee, by writing information on the operation of the Securities and Exchange Commissions Public Reference Room.



|I. | Subsidiary Information
|-- | ----------------------



Not applicable.



|ITEM 11. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
|-------- | ----------------------------------------------------------



Market risk is the risk of loss related to adverse changes in market prices, including interest rates and foreign exchange rates, of financial
instruments. We are exposed to various types of market risks, including changes in interest rates and foreign currency exchange rates, in the normal course of business.



We use financial instruments, including variable rate debt and swaps and forward contracts, to manage risks associated with
our interest rate and foreign currency exposures through a controlled program of risk management in accordance with established policies. These policies are reviewed and approved by our board of directors. Our treasury operations are subject to
internal audit on a regular basis. We do not hold or issue derivative financial instruments for trading purposes.



85



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Since export sales are primarily conducted in U.S. dollars, we had U.S. dollar-denominated accounts
receivables of US$385 million as of December 31, 2004. As of the same date, we also had Japanese Yen-denominated accounts receivable of ¥7,052 million attributable to our Japanese operations. We had U.S. dollar- and Japanese Yen-denominated
accounts payables of US$151 million and ¥11,090 million.



As of December 31, 2004, we had U.S. dollar-, Japanese Yen-, NT dollar-, HK dollar- and Euro-denominated savings accounts of US$29 million, ¥6,864 million, NT$305 million, HK$1 million and 1 million, respectively. We also had time
deposits denominated in U.S. dollars, Japanese Yen, NT dollars and Euros of US$48 million, ¥42,929 million, NT$71,300 million and 6 million, respectively.



Our primary market risk exposures relate to interest rate movements on borrowings and exchange rate movements on foreign
currency-denominated capital expenditures relating to equipment used in manufacturing processes (including photo etching and chemical vapor deposition) and purchased primarily from Japan and the United States. The fair value of forward exchange
contracts and interest rate swaps has been determined by obtaining the estimated amount from our bankers that would be received/(paid) to terminate the contracts.



The following table provides information as of December 31, 2004 on our derivative financial instruments.



|                                           |  |                         |  |            |  
|------------------------------------------ |  | ----------------------- |  | ---------- | -
|                                           |  | As of December 31, 2004 | 
|                                           |  | Book Value              |  | Fair Value |  
|                                           |  | (in NT$ thousands)      | 
|Credit-linked Deposits and Repackage Bonds |  | 2,942,434               |  | 2,942,434  |  
|Interest Rate Swaps                        |  | 35,532                  |  | (416,149   | )
|Forward Contracts                          |  | 38,633                  |  | 38,633     |  



Interest Rate Risk



Our major market risk exposure is changing interest
rates. Our exposure to market risk for changes in interest rates relates primarily to our long-term debt obligations. We primarily enter into debt obligations to support general corporate purposes including capital expenditures and working capital
needs. We use interest rate swaps from time to time to modify our exposure to interest rate movements and reduce borrowing costs. Interest rate swaps limit the risks of fluctuating interest rates by allowing us to convert a portion of the interest
on our borrowings from a variable rate to a fixed rate. As of December 31, 2004, we had the following interest rate swaps in effect:



|                  |  |                              |  |                               |  |                   
|----------------- |  | ---------------------------- |  | ----------------------------- |  | ------------------
|Notional Amount   |  | Contract Period              |  | Interest Rate Received        |  | Interest Rate Paid
|NT$7,500 millions |  | May 20, 2003 to May 20, 2008 |  | 4.0% minus USD 12-month LIBOR |  | 1.52%             
|NT$7,500 millions |  | May 20, 2003 to May 20, 2010 |  | 4.3% minus USD 12-month LIBOR |  | 1.48%             



The table below
provides information as of December 31, 2004 about our financial instruments that are sensitive to changes in interest rates, including debt obligations and certain assets. For debt obligations, the table presents principal cash flows and related
weighted average interest rates by expected maturity dates. The information is presented in the currencies in which the instruments are denominated.



|                      |  |                                   |   |  |      |  |      |  |      |  |                     |  |           |   |  |            |  
|--------------------- |  | --------------------------------- | - |  | ---- |  | ---- |  | ---- |  | ------------------- |  | --------- | - |  | ---------- | -
|                      |  | Expected Maturity Dates           |  
|                      |  | 2005                              |   |  | 2006 |  | 2007 |  | 2008 |  | 2009 and thereafter |  | Total     |   |  | Fair Value |  
|                      |  | (in millions, except percentages) |  
|Time Deposit:         |  |                                   |   |  |      |  |      |  |      |  |                     |  |           |   |  |            |  
|Fixed Rate (US$)      |  | 48                                |   |  |     |  |     |  |     |  |                    |  | 48        |   |  | 48         |  
|Average Interest Rate |  | 0.85-2.30                         | % |  |     |  |     |  |     |  |                    |  | 0.85-2.30 | % |  | 0.85-2.30  | %
|Fixed Rate (¥)        |  | 42,929                            |   |  |     |  |     |  |     |  |                    |  | 42,929    |   |  | 42,929     |  
|Average Interest Rate |  | 0.04-0.05                         | % |  |     |  |     |  |     |  |                    |  | 0.04-0.05 | % |  | 0.04-0.05  | %



86



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|                             |  |                                   |   |  |              |   |  |             |   |  |            |   |  |                     |   |  |              |   |  |              |  
|---------------------------- |  | --------------------------------- | - |  | ------------ | - |  | ----------- | - |  | ---------- | - |  | ------------------- | - |  | ------------ | - |  | ------------ | -
|                             |  | Expected Maturity Dates           |  
|                             |  | 2005                              |   |  | 2006         |   |  | 2007        |   |  | 2008       |   |  | 2009 and thereafter |   |  | Total        |   |  | Fair Value   |  
|                             |  | (in millions, except percentages) |  
|Fixed Rate (NT$)             |  | 71,300                            |   |  |             |   |  |            |   |  |           |   |  |                    |   |  | 71,300       |   |  | 71,300       |  
|Average Interest Rate        |  | 0.85-1.40                         | % |  |             |   |  |            |   |  |           |   |  |                    |   |  | 0.85-1.40    | % |  | 0.85-1.40    | %
|Fixed Rate ()               |  | 6                                 |   |  |             |   |  |            |   |  |           |   |  |                    |   |  | 6            |   |  | 6            |  
|Average Interest Rate        |  | 2.00                              | % |  |             |   |  |            |   |  |           |   |  |                    |   |  | 2.00         | % |  | 2.00         | %
|Unsecured Short-term Loans:  |  |                                   |   |  |              |   |  |             |   |  |            |   |  |                     |   |  |              |   |  |              |  
|Variable Rate (US$)          |  | 91                                |   |  |             |   |  |            |   |  |           |   |  |                    |   |  | 91           |   |  | 91           |  
|Average Interest Rate        |  | 2.69-2.89                         | % |  |             |   |  |            |   |  |           |   |  |                    |   |  | 2.69-2.89    | % |  | 2.69-2.89    | %
|Variable Rate (¥)            |  | 24                                |   |  |             |   |  |            |   |  |           |   |  |                    |   |  | 24           |   |  | 24           |  
|Average Interest Rate        |  | 0.86                              | % |  |             |   |  |            |   |  |           |   |  |                    |   |  | 0.86         | % |  | 0.86         | %
|Variable Rate (NT$)          |  | 70                                |   |  |             |   |  |            |   |  |           |   |  |                    |   |  | 70           |   |  | 70           |  
|Average Interest Rate        |  | 1.65-1.7                          | % |  |             |   |  |            |   |  |           |   |  |                    |   |  | 1.65-1.7     | % |  | 1.65-1.7     | %
|Bonds:                       |  |                                   |   |  |              |   |  |             |   |  |            |   |  |                     |   |  |              |   |  |              |  
|Unsecured (NT$)              |  | 2,250                             |   |  | 10,250       |   |  | 2,250       |   |  | 10,500     |   |  | 7,500               |   |  | 32,750       |   |  | 33,954       |  
|Fixed Rate                   |  | 5.1195-5.185                      | % |  | 3.4896-5.285 | % |  | 5.217-5.285 | % |  | 1.52-5.285 | % |  | 1.48                | % |  | 1.48%-1.5285 | % |  | 1.48%-0.5285 | %
|Unsecured Exchangeable (US$) |  |                                  |   |  |             |   |  | 98          |   |  |           |   |  |                    |   |  | 98           |   |  | 110          |  
|Fixed Rate                   |  |                                  |   |  |             |   |  | 0           | % |  |           |   |  |                    |   |  | 0            | % |  | 0            | %
|Unsecured (JP¥)              |  |                                  |   |  |             |   |  | 8,630       |   |  |           |   |  | 21,500              |   |  | 30,130       |   |  | 28,235       |  
|Fixed rate                   |  |                                  |   |  |             |   |  | 0           | % |  |           |   |  | 0                   | % |  | 0            | % |  | 0            | %
|Secured (NT$)                |  | 570                               |   |  |             |   |  |            |   |  |           |   |  |                    |   |  | 570          |   |  | 570          |  
|Fixed Rate                   |  | 5.6                               | % |  |             |   |  |            |   |  |           |   |  |                    |   |  | 5.6          | % |  | 5.6          | %
|Secured Long-term Loans:     |  |                                   |   |  |              |   |  |             |   |  |            |   |  |                     |   |  |              |   |  |              |  
|Variable Rate (US$)          |  | 171                               |   |  | 171          |   |  | 171         |   |  | 87         |   |  |                    |   |  | 600          |   |  | 600          |  
|Average Interest Rate        |  | 2.20-3.55                         | % |  | 2.20-3.55    | % |  | 2.20-3.55   | % |  | 2.20-3.55  | % |  |                    |   |  | 2.20-3.55    | % |  | 2.20-3.55    | %
|Unsecured Long-term Loans:   |  |                                   |   |  |              |   |  |             |   |  |            |   |  |                     |   |  |              |   |  |              |  
|Variable Rate (JP¥)          |  |                                  |   |  | 7,500        |   |  | 7,500       |   |  |           |   |  |                    |   |  | 15,000       |   |  | 15,000       |  
|Average Interest Rate        |  |                                  |   |  | 0.81-0.86    | % |  | 0.81-0.86   | % |  |           |   |  |                    |   |  | 0.81-0.86    | % |  | 0.81-0.86    | %



Foreign Currency Risk



Although the majority of our transactions are in NT
dollars, some transactions are based in other currencies. The primary currencies to which we are exposed are the U.S. dollar and the Japanese Yen. We have in the past, and may in the future, enter into short-term, forward exchange contracts to hedge
the impact of foreign currency fluctuations on certain underlying assets, liabilities, and firm commitments for operating expenses and capital expenditures denominated in U.S. dollars. The purpose of entering into these hedges is to minimize the
impact of foreign currency fluctuations on the results of operations. Gains and losses on foreign currency contracts and foreign currency-denominated liabilities are recorded in the period of the exchange rate changes. The contracts have maturity
dates that do not exceed three months.



As of December 31,
2004, we had US$87 million outstanding of foreign currency forward contracts.



|ITEM 12. | DESCRIPTION OF SECURITIES OTHER THAN EQUITY SECURITIES
|-------- | ------------------------------------------------------



Not applicable.



87



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##### Table of Contents

PART II



ITEM 13.    DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES



None of these events occurred in any of 2002, 2003 or 2004.



ITEM 14.    MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS AND USE OF PROCEEDS



None.



ITEM 15.    CONTROLS AND PROCEDURES



As of the end of the period covered by this annual report, an evaluation has been carried out under the supervision and with the participation of our management, including our chief executive officer and our chief
financial officer, of the effectiveness of the design and operation of our disclosure controls and procedures, as such term is defined under Rules 13a-14(c) and 15d-14(c) promulgated under the Securities Exchange Act of 1934, as amended, or Exchange
Act. Based on that evaluation, our chief executive officer and chief financial officer have concluded that our disclosure controls and procedures are effective in ensuring that material information required to be disclosed in this annual report is
recorded, processed, summarized and reported to them for assessment, and required disclosure is made within the time period specified in the rules and forms of the Securities and Exchange Commission. In addition, we have established a Disclosure
Committee in early 2003 to assist us in fulfilling our responsibility for oversight of the accuracy and timeliness of our periodic reports filed with the Securities and Exchange Commission.



There has been no change in our internal control over financial reporting
that occurred during the period covered by this annual report that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.



ITEM 16A.    AUDIT COMMITTEE FINANCIAL EXPERT



Our Board of Directors has determined that Jack K.C.Wang, Mao-Chung Lin, and Paul S.C. Hsu qualify as audit committee financial experts as defined in Item
16A of the instruction to Form 20-F.



ITEM 16B.    CODE OF ETHICS



In March, 2005 we adopted the Code of Ethics for Directors, Supervisors and Officers and the Employee Code of Conduct. The Employee Code of Conduct, which is applicable to all employees, replaced the code of ethics
filed with the Securities and Exchange Commission in our 2003 annual report on Form 20-F. We have also created a separate code of ethics applicable to our directors, supervisors and officers. A copy of each of the Code of Ethics for Directors,
Supervisors and Officers and the Employee Code of Conduct are displayed on our website at http://www.umc.com/english/pdf/Code_of_Ethics.pdf and http://www.umc.com/english/pdf/Code_of_Conduct.pdf, respectively.



ITEM 16C.    PRINCIPAL ACCOUNTANT FEES AND SERVICES



The following table sets forth the aggregate fees by categories specified below in connection with certain professional services rendered by Diwan, Ernst
& Young, our principal external auditors, for the years indicated.



88



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##### Table of Contents

|                      |  |                                |  |        |  |      
|--------------------- |  | ------------------------------ |  | ------ |  | -----
|                      |  | For the year endedDecember 31,
|                      |  | 2003                           |  | 2004  
|                      |  | NT$                            |  | NT$    |  | US$  
|                      |  | (in thousands)                
|Audit Fees(1)         |  | 30,311                         |  | 31,882 |  | 1,004
|Audit-related Fees(2) |  | 2,665                          |  | 820    |  | 26   
|Tax Fees(3)           |  | 4,117                          |  | 3,820  |  | 120  
|All Other Fees(4)     |  | 48                             |  |       |  |     
|                      |  |                                |  |        |  |      
|Total                 |  | 37,141                         |  | 36,522 |  | 1,150
|                      |  |                                |  |        |  |      

---

|(1) | Audit fees consist of fees associated with the annual audit, review of our quarterly
financial statements and statutory audits. They also include fees billed for those services that are normally provided by the independent accountants in connection with statutory and regulatory filings.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(2) | Audit-related fees consist of fees billed for assurance and related services that are reasonably related to the performance of the audit or review of our financial
statements but not described in footnote (1) above. These services include consultations concerning financial accounting and reporting standards and review of capitalization of retained earnings, employee stock option application, treasury share
buy-back programs and certification of UMCi to Singapore authorities.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(3) | Tax fees include fees billed for professional services rendered by Diwan, Ernst & Young, primarily in connection with our tax compliance activities.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------



|(4) | All other fees comprise fees for all other services provided by Diwan, Ernst & Young, other than those services covered in footnotes (1) to (3) above.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------



Prior to forming an audit committee, our board
of directors is responsible for the oversight of our independent accountants work. The policy of our board of directors is to pre-approve all audit and non-audit services provided by Diwan, Ernst & Young, including audit services,
audit-related services, tax services and other services, as described above. After our audit committee was established in March 2005, all audit and non-audit services provided by Diwan, Ernst & Young were pre-approved by our audit committee.



ITEM 16D.    EXEMPTIONS FROM THE LISTING STANDARDS FOR AUDIT COMMITTEES



None.



ITEM 16E.    PURCHASE OF EQUITY SECURITIES BY THE ISSUER AND AFFILIATED PURCHASERS



On March 23, 2004, we announced a plan which was not binding on us, to buy back up to 360 million of our shares on the Taiwan Stock Exchange at a price
range of NT$19.6 to NT$47.5 per share between March 24, 2004 and May 23, 2004.



|                            |  |                                         |  |                                           |  |                                                                                         |  |                                                                                      
|--------------------------- |  | --------------------------------------- |  | ----------------------------------------- |  | --------------------------------------------------------------------------------------- |  | -------------------------------------------------------------------------------------
|Period                      |  | Total Number of Common Shares Purchased |  | Average Price Paid per Common Share (NT$) |  | Total Number of Common Shares Purchased as Part of Publicly Announced Plans or
Programs |  | Maximum Number of Common Shares that May Yet be Purchased Under the Plans
or Programs
|March (from March 24, 2004) |  |                                        |  |                                          |  |                                                                                        |  | 360,000,000                                                                          
|April                       |  |                                        |  |                                          |  |                                                                                        |  | 360,000,000                                                                          
|May (to May 23, 2004)       |  | 192,067,000                             |  | 27.06                                     |  | 192,067,000                                                                             |  |                                                                                     
|                            |  |                                         |  |                                           |  |                                                                                         |  |                                                                                      
|Total                       |  | 192,067,000                             |  | 27.06                                     |  | 192,067,000                                                                             |  |                                                                                     
|                            |  |                                         |  |                                           |  |                                                                                         |  |                                                                                      



For information
relating to our recently announced share buy-back plan, see Item 5. Operating and Financial Review and ProspectsTreasury Share Programs.



89



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##### Table of Contents

PART III



|ITEM 17. | FINANCIAL STATEMENTS
|-------- | --------------------



The Registrant has elected to provide the financial statements and related information specified in Item 18.



|ITEM 18. | FINANCIAL STATEMENTS
|-------- | --------------------



The following is a list of the audited financial statements and report of independent registered public accounting firm included in this annual report
beginning on page
F-1.



|                                                                                                                              |  |     
|----------------------------------------------------------------------------------------------------------------------------- |  | ----
|                                                                                                                              |  | Page
|Consolidated Financial Statements of United Microelectronics Corporation and Subsidiaries                                     |  |     
|Report of Independent Registered Public Accounting Firm                                                                       |  | F-2 
|Consolidated Balance Sheets at December 31, 2003 and 2004                                                                     |  | F-3 
|Consolidated Statements of Operations for each of the three years ended December 31, 2002, 2003 and 2004                      |  | F-4 
|Consolidated Statements of Changes in Stockholders Equity for each of the three years ended December 31, 2002, 2003 and 2004 |  | F-5 
|Consolidated Statements of Cash Flows for each of the three years ended December 31, 2002, 2003 and 2004                      |  | F-8 
|Notes to the Consolidated Financial Statements                                                                                |  | F-10



90



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##### Table of Contents

ITEM 19. EXHIBITS



|               |  |                                                                                                                                                                                                                                                                          
|-------------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit Number |  | Description of Exhibits                                                                                                                                                                                                                                                  
|               | 
|*1.1           |  | Articles of Incorporation of the Company as last amended on June 13, 2005 (English Translation)                                                                                                                                                                          
|               | 
|2.1            |  | Form of Deposit Agreement among the Company, and Holders and Beneficial Owners of American Depositary Shares issued thereunder, including the form of American Depositary Shares
(1)                                                                                     
|               | 
|4.1            |  | Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, Ko-Kuan Section, No. 20-22, Hsinchu, Taiwan, ROC, the site of
Fab 6A (in Chinese with English summary translation) (2)                    
|               | 
|4.2            |  | Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, third section of first phase, Hsinchu, Taiwan, ROC, the site of
Fab 8AB and United Tower (in Chinese with English summary translation) (3)
|               | 
|4.3            |  | Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, third section of first phase, Hsinchu, Taiwan, ROC, the site of
Fab 8C (in Chinese with English summary translation) (4)                  
|               | 
|4.4            |  | Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, third section of first phase, Hsinchu, Taiwan, ROC, the site of
Fab 8D (in Chinese with English summary translation) (5)                  
|               | 
|4.5            |  | Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, third section of second phase, Hsinchu, Taiwan, ROC, the site of
Fab 8E (in Chinese with English summary translation) (6)                 
|               | 
|4.6            |  | Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, Gin-Shan section, Hsinchu, Taiwan, ROC, the site of Fab 8F (in
Chinese with English summary translation) (7)                              
|               | 
|4.7            |  | Lease Agreement with Southern Taiwan Science Park Administration in relation to government-owned land located at Tainan Science Park, Tainan, Taiwan, ROC, the site of Fab 12A (in Chinese with
English summary translation) (8)                                         
|               | 
|4.8            |  | Merger Agreement, entered into as of February 26, 2004, between United Microelectronics Corporation and SiS Microelectronics Corporation (English Translation) (9)                                                                                                       
|               | 
|*8.1           |  | List of Significant Subsidiaries of United Microelectronics Corporation                                                                                                                                                                                                  
|               | 
|11.1           |  | Code of Ethics for Directors, Supervisors and Officers (10)                                                                                                                                                                                                              
|               | 
|11.2           |  | Employee Code of Conduct (11)                                                                                                                                                                                                                                            
|               | 
|*12.1          |  | Certification of our Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                                                                                                                                                   
|               | 
|*12.2          |  | Certification of our Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                                                                                                                                                   
|               | 
|*13.1          |  | Certification of our Chief Executive Officer pursuant to 18 U.S.C.§ 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002                                                                                                                           
|               | 
|*13.2          |  | Certification of our Chief Financial Officer pursuant to 18 U.S.C.§ 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002                                                                                                                           
|               | 
|*15.1          |  | Consent of Independent Registered Public Accounting Firm                                                                                                                                                                                                                 

---

|* | filed herewith.
|- | ---------------

|(1) | Incorporated by reference to Exhibit (a) to the Registrants Registration Statement on Form F-6 (File No. 333-13796) filed with the Commission on August 6,
2001.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | Incorporated by reference to Exhibit 10.6 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28,
2000, as amended.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | Incorporated by reference to Exhibit 10.7 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28,
2000, as amended.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(4) | Incorporated by reference to Exhibit 10.8 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28,
2000, as amended.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(5) | Incorporated by reference to Exhibit 10.9 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28,
2000, as amended.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(6) | Incorporated by reference to Exhibit 10.10 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28,
2000, as amended.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(7) | Incorporated by reference to Exhibit 10.11 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28,
2000, as amended.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(8) | Incorporated by reference to Exhibit 10.12 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28,
2000, as amended.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(9) | Incorporated by reference to Exhibit 4.8 to the Registrants Annual Report on Form 20-F for the fiscal year ended December 31, 2003 (File No. 1-15128) filed
with the Commission on June 17, 2004.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(10) | Incorporated by reference to Exhibit 99.1 to the Form 6-K filed with the Commission on March 25, 2005.
|---- | ------------------------------------------------------------------------------------------------------

|(11) | Incorporated by reference to Exhibit 99.2 to the Form 6-K filed with the Commission on March 25, 2005.
|---- | ------------------------------------------------------------------------------------------------------



91



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SIGNATURES



The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F and that it has duly caused and authorized the
undersigned to sign this annual report on its behalf.



United Microelectronics CorporationBy:

/s/ Stan HungName: Stan HungTitle: Chief Financial Officer




Date: June 29, 2005



92



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##### Table of Contents

United Microelectronics Corporation and Subsidiaries



Consolidated Financial Statements as of December 31, 2002, 2003 and 2004



Together with Report of Independent Registered Public Accounting Firm



F-1



---

##### Table of Contents

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM



To the Board of Directors and Shareholders of

United Microelectronics Corporation



We have audited the accompanying consolidated balance sheets of United Microelectronics Corporation and subsidiaries as of December 31, 2003
and 2004, and the related consolidated statements of operations, changes in stockholders equity and cash flows for the years ended December 31, 2002, 2003 and 2004. These financial statements are the responsibility of the Companys
management. Our responsibility is to express an opinion on these financial statements based on our audits.



We conducted our audits in accordance with auditing standards generally accepted in the Republic of China and the standards of the Public Company Accounting Oversight Board (United States). Those standards require
that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement. We were not engaged to perform an audit of the Companys internal control over financial reporting. Our
audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the
Companys internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.



In our opinion, the financial statements referred to above present fairly, in all material
respects, the consolidated financial position of United Microelectronics Corporation and subsidiaries as of December 31, 2003 and 2004, and the consolidated results of their operations and their cash flows for the years ended December 31, 2002, 2003
and 2004, in conformity with the Guidelines Governing the Preparation of Financial Reports by Securities Issuers and accounting principles generally accepted in the Republic of China, which differ in certain respects from accounting
principles generally accepted in the United States of America (see note 33 to the consolidated financial statements).



DIWAN, ERNST & YOUNG

CERTIFIED PUBLIC ACCOUNTANTS



Taipei, Taiwan

Republic of China

June 10, 2005



F-2



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##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(Expressed in thousands)



|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|----------------------------------------------------------- |  | ----------------- |  | ------------------ | - |  | ------------ | - |  | ---------- | -
|                                                            |  | Notes             |  | As of December 31, |  
|                                                            |  |                   |  | 2003               |   |  | 2004         |  
|                                                            |  |                   |  | NT$                |   |  | NT$          |   |  | US$        |  
|Assets                                                      |  |                   |  |                    |   |  |              |   |  |            |  
|Current assets                                              |  |                   |  |                    |   |  |              |   |  |            |  
|Cash and cash equivalents                                   |  | 2, 4              |  | 118,771,773        |   |  | 101,381,973  |   |  | 3,194,139  |  
|Marketable securities, net                                  |  | 2, 5              |  | 1,820,328          |   |  | 3,143,697    |   |  | 99,045     |  
|Notes receivable                                            |  | 6                 |  | 8,756              |   |  | 2,040        |   |  | 64         |  
|Notes receivable - related parties                          |  | 25                |  | 101,753            |   |  | 39,034       |   |  | 1,230      |  
|Accounts receivable, net                                    |  | 2, 7              |  | 15,079,068         |   |  | 11,267,614   |   |  | 354,997    |  
|Accounts receivable - related parties, net                  |  | 2, 25             |  | 3,285,371          |   |  | 2,036,788    |   |  | 64,171     |  
|Other receivables                                           |  | 2                 |  | 708,946            |   |  | 661,623      |   |  | 20,845     |  
|Other financial assets, current                             |  | 2, 8, 31          |  | 2,446,603          |   |  | 453,845      |   |  | 14,299     |  
|Inventories, net                                            |  | 2, 9              |  | 8,370,165          |   |  | 10,012,998   |   |  | 315,470    |  
|Prepaid expenses                                            |  |                   |  | 752,697            |   |  | 327,810      |   |  | 10,328     |  
|Deferred income tax assets, current                         |  | 2, 22             |  | 2,953,378          |   |  | 3,608,968    |   |  | 113,704    |  
|Restricted bank balances                                    |  | 26                |  | 21,875             |   |  |             |   |  |           |  
|Other current assets                                        |  |                   |  | 1,089              |   |  |             |   |  |           |  
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Total current assets                                        |  |                   |  | 154,321,802        |   |  | 132,936,390  |   |  | 4,188,292  |  
|Funds and long-term investments                             |  | 2, 10             |  |                    |   |  |              |   |  |            |  
|Long-term investments accounted for under the equity method |  |                   |  | 21,905,026         |   |  | 21,395,116   |   |  | 674,074    |  
|Long-term investments accounted for under the cost method   |  |                   |  | 16,964,768         |   |  | 11,538,899   |   |  | 363,545    |  
|Prepaid long-term investments                               |  |                   |  | 52,343             |   |  | 16,630       |   |  | 524        |  
|Less: Allowance for loss on decline in market value         |  |                   |  | (62,888            | ) |  | (238,367     | ) |  | (7,510     | )
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Total funds and long-term investments                       |  |                   |  | 38,859,249         |   |  | 32,712,278   |   |  | 1,030,633  |  
|Other financial assets, noncurrent                          |  | 2, 8, 31          |  | 1,848,530          |   |  | 2,562,754    |   |  | 80,742     |  
|Property, plant and equipment                               |  | 2, 11, 25, 26, 27 |  |                    |   |  |              |   |  |            |  
|Land                                                        |  |                   |  | 1,560,237          |   |  | 1,320,095    |   |  | 41,591     |  
|Buildings                                                   |  |                   |  | 17,721,538         |   |  | 21,237,012   |   |  | 669,093    |  
|Machinery and equipment                                     |  |                   |  | 273,066,176        |   |  | 358,501,761  |   |  | 11,294,951 |  
|Furniture and fixtures                                      |  |                   |  | 2,521,756          |   |  | 2,638,541    |   |  | 83,130     |  
|Leasehold improvements                                      |  |                   |  | 40,848             |   |  | 38,620       |   |  | 1,217      |  
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Total cost                                                  |  |                   |  | 294,910,555        |   |  | 383,736,029  |   |  | 12,089,982 |  
|Less : Accumulated depreciation                             |  |                   |  | (168,200,915       | ) |  | (223,457,030 | ) |  | (7,040,234 | )
|Add : Construction in progress and prepayments              |  |                   |  | 22,846,921         |   |  | 31,745,156   |   |  | 1,000,162  |  
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Property, plant and equipment, net                          |  |                   |  | 149,556,561        |   |  | 192,024,155  |   |  | 6,049,910  |  
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Goodwill                                                    |  | 2, 24             |  | 9,978              |   |  | 4,497,726    |   |  | 141,705    |  
|Deferred charges                                            |  | 2                 |  | 3,038,689          |   |  | 2,864,368    |   |  | 90,245     |  
|Deferred income tax assets, noncurrent                      |  | 2, 22             |  | 4,485,003          |   |  | 3,790,903    |   |  | 119,436    |  
|Other assets                                                |  | 2, 12, 26         |  | 2,393,991          |   |  | 4,916,309    |   |  | 154,893    |  
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Total assets                                                |  |                   |  | 354,513,803        |   |  | 376,304,883  |   |  | 11,855,856 |  
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Liabilities and Stockholders Equity                        |  |                   |  |                    |   |  |              |   |  |            |  
|Current liabilities                                         |  |                   |  |                    |   |  |              |   |  |            |  
|Short-term loans                                            |  | 13                |  | 1,884,899          |   |  | 2,986,919    |   |  | 94,106     |  
|Notes payable                                               |  |                   |  | 153,892            |   |  | 189,497      |   |  | 5,970      |  
|Accounts payable                                            |  |                   |  | 5,787,440          |   |  | 4,724,287    |   |  | 148,843    |  
|Accounts payable - related parties                          |  | 25                |  | 812,849            |   |  | 682,048      |   |  | 21,489     |  
|Income tax payable                                          |  | 2                 |  | 224,930            |   |  | 241,449      |   |  | 7,607      |  
|Accrued expenses                                            |  |                   |  | 5,213,758          |   |  | 9,204,536    |   |  | 289,998    |  
|Payable to equipment suppliers                              |  |                   |  | 7,370,809          |   |  | 8,071,379    |   |  | 254,297    |  
|Current portion of long-term interest-bearing liabilities   |  | 14, 15, 25, 26    |  | 20,923,327         |   |  | 8,261,146    |   |  | 260,275    |  
|Current portion of capacity deposits                        |  | 27                |  | 1,767,910          |   |  | 2,237,086    |   |  | 70,482     |  
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Total current liabilities                                   |  |                   |  | 44,139,814         |   |  | 36,598,347   |   |  | 1,153,067  |  
|Long-term liabilities                                       |  |                   |  |                    |   |  |              |   |  |            |  
|Bonds payable                                               |  | 2, 10, 14         |  | 58,213,913         |   |  | 43,018,761   |   |  | 1,355,348  |  
|Long-term loans                                             |  | 15, 25, 26        |  | 2,120,533          |   |  | 18,269,357   |   |  | 575,595    |  
|Accrued pension liabilities                                 |  | 2, 16             |  | 2,309,892          |   |  | 2,713,408    |   |  | 85,489     |  
|Deposits-in                                                 |  |                   |  | 5,255              |   |  | 19,301       |   |  | 608        |  
|Other long-term liabilities                                 |  |                   |  | 413,326            |   |  | 582,956      |   |  | 18,366     |  
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Total long-term liabilities                                 |  |                   |  | 63,062,919         |   |  | 64,603,783   |   |  | 2,035,406  |  
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Total liabilities                                           |  |                   |  | 107,202,733        |   |  | 101,202,130  |   |  | 3,188,473  |  
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Minority interests                                          |  |                   |  | 15,078,024         |   |  | 8,728,877    |   |  | 275,012    |  
|Stockholders equity                                        |  |                   |  |                    |   |  |              |   |  |            |  
|Capital stock                                               |  | 2, 17, 18, 24     |  | 161,407,435        |   |  | 177,923,859  |   |  | 5,605,667  |  
|Capital reserve                                             |  | 2, 18, 24         |  | 80,074,184         |   |  | 84,933,195   |   |  | 2,675,904  |  
|Retained earnings                                           |  | 20                |  | 26,794,291         |   |  | 42,401,701   |   |  | 1,335,907  |  
|Unrealized loss on long-term investments                    |  | 2                 |  | (90,864            | ) |  | (424,713     | ) |  | (13,381    | )
|Cumulative translation adjustment                           |  | 2                 |  | 913,877            |   |  | (1,319,452   | ) |  | (41,571    | )
|Treasury stock                                              |  | 2, 19             |  | (36,865,877        | ) |  | (37,140,714  | ) |  | (1,170,155 | )
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Total stockholders equity                                  |  |                   |  | 232,233,046        |   |  | 266,373,876  |   |  | 8,392,371  |  
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  
|Total liabilities and stockholders equity                  |  |                   |  | 354,513,803        |   |  | 376,304,883  |   |  | 11,855,856 |  
|                                                            |  |                   |  |                    |   |  |              |   |  |            |  



The accompanying
notes are an integral part of these consolidated financial statements



F-3



---

##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(Expressed in thousands, except per share data)



|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|------------------------------------------------------------------------------------------------------------------------------- |  | ------ |  | ------------------------------- | - |  | ----------- | - |  | ----------- | - |  | ---------- | -
|                                                                                                                                |  | Notes  |  | For the year ended December 31, |  
|                                                                                                                                |  |        |  | 2002                            |   |  | 2003        |   |  | 2004        |  
|                                                                                                                                |  |        |  | NT$                             |   |  | NT$         |   |  | NT$         |   |  | US$        |  
|Net operating revenues                                                                                                          |  | 2, 25  |  | 75,425,356                      |   |  | 95,703,732  |   |  | 129,190,740 |   |  | 4,070,282  |  
|Cost of goods sold                                                                                                              |  | 21, 25 |  | (62,887,302                     | ) |  | (73,937,813 | ) |  | (92,392,315 | ) |  | (2,910,911 | )
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Gross profit                                                                                                                    |  |        |  | 12,538,054                      |   |  | 21,765,919  |   |  | 36,798,425  |   |  | 1,159,371  |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Operating expenses                                                                                                              |  | 21     |  |                                 |   |  |             |   |  |             |   |  |            |  
|Sales and marketing expenses                                                                                                    |  |        |  | (1,526,907                      | ) |  | (2,170,897  | ) |  | (2,775,289  | ) |  | (87,438    | )
|General and administrative expenses                                                                                             |  |        |  | (3,530,756                      | ) |  | (3,996,466  | ) |  | (4,853,119  | ) |  | (152,903   | )
|Research and development expenses                                                                                               |  |        |  | (7,368,133                      | ) |  | (5,858,629  | ) |  | (7,363,620  | ) |  | (231,998   | )
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|                                                                                                                                |  |        |  | (12,425,796                     | ) |  | (12,025,992 | ) |  | (14,992,028 | ) |  | (472,339   | )
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Operating income                                                                                                                |  |        |  | 112,258                         |   |  | 9,739,927   |   |  | 21,806,397  |   |  | 687,032    |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Non-operating income                                                                                                            |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Interest revenue                                                                                                                |  |        |  | 1,644,100                       |   |  | 1,141,264   |   |  | 1,040,652   |   |  | 32,787     |  
|Investment income accounted for under the equity method, net                                                                    |  | 2, 10  |  | 230,600                         |   |  | 300,724     |   |  | 551,779     |   |  | 17,385     |  
|Dividend income                                                                                                                 |  |        |  | 256,543                         |   |  | 837,696     |   |  | 1,163,438   |   |  | 36,655     |  
|Gain on disposal of property, plant and equipment                                                                               |  | 2      |  | 66,236                          |   |  | 216,992     |   |  | 139,951     |   |  | 4,409      |  
|Gain on disposal of investments, net                                                                                            |  | 2, 14  |  | 8,473,213                       |   |  | 6,885,374   |   |  | 12,868,569  |   |  | 405,437    |  
|Exchange gain, net                                                                                                              |  | 2      |  |                                |   |  | 256,452     |   |  |            |   |  |           |  
|Recovery on decline in market value of marketable securities                                                                    |  | 2      |  |                                |   |  | 10,806      |   |  |            |   |  |           |  
|Other income                                                                                                                    |  | 2, 14  |  | 702,287                         |   |  | 764,190     |   |  | 635,092     |   |  | 20,009     |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|                                                                                                                                |  |        |  | 11,372,979                      |   |  | 10,413,498  |   |  | 16,399,481  |   |  | 516,682    |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Non-operating expenses                                                                                                          |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Interest expense                                                                                                                |  | 11, 25 |  | (1,455,374                      | ) |  | (1,326,155  | ) |  | (1,434,823  | ) |  | (45,205    | )
|Other investment loss                                                                                                           |  | 2      |  | (1,419,371                      | ) |  | (1,866,454  | ) |  | (473,529    | ) |  | (14,919    | )
|Loss on disposal of property, plant and equipment                                                                               |  | 2      |  | (45,814                         | ) |  | (170,576    | ) |  | (230,609    | ) |  | (7,266     | )
|Exchange loss, net                                                                                                              |  | 2, 31  |  | (103,703                        | ) |  |            |   |  | (928,891    | ) |  | (29,266    | )
|Loss on decline in market value and obsolescence of inventories                                                                 |  | 2      |  | (955,074                        | ) |  | (1,443,565  | ) |  | (1,884,466  | ) |  | (59,372    | )
|Financial expenses                                                                                                              |  |        |  | (426,560                        | ) |  | (387,916    | ) |  | (396,909    | ) |  | (12,505    | )
|Other losses                                                                                                                    |  | 2, 14  |  | (63,093                         | ) |  | (263,054    | ) |  | (1,112,082  | ) |  | (35,037    | )
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|                                                                                                                                |  |        |  | (4,468,989                      | ) |  | (5,457,720  | ) |  | (6,461,309  | ) |  | (203,570   | )
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Income before income tax and minority interests                                                                                 |  |        |  | 7,016,248                       |   |  | 14,695,705  |   |  | 31,744,569  |   |  | 1,000,144  |  
|Income tax expense                                                                                                              |  | 2, 22  |  | (270,731                        | ) |  | (979,469    | ) |  | (373,800    | ) |  | (11,777    | )
|Minority interests                                                                                                              |  |        |  | 326,515                         |   |  | 304,021     |   |  | 472,612     |   |  | 14,890     |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Net income                                                                                                                      |  |        |  | 7,072,032                       |   |  | 14,020,257  |   |  | 31,843,381  |   |  | 1,003,257  |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Earnings per share - basic (in dollars)                                                                                         |  | 2, 23  |  | 0.42                            |   |  | 0.84        |   |  | 1.89        |   |  |            |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Shares used in per share calculation - basic                                                                                    |  |        |  | 16,740,780                      |   |  | 16,644,032  |   |  | 16,828,205  |   |  |            |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Earnings per share - diluted (in dollars)                                                                                       |  | 2, 23  |  | 0.42                            |   |  | 0.83        |   |  | 1.86        |   |  |            |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Shares used in per share calculation - diluted                                                                                  |  |        |  | 16,957,878                      |   |  | 17,025,359  |   |  | 17,094,848  |   |  |            |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Pro forma information on earnings as if unconsolidated subsidiaries investment in the Company is not treated as treasury
stock |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Net income                                                                                                                      |  |        |  |                                 |   |  | 14,020,257  |   |  | 31,843,381  |   |  |            |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Earnings per share - basic (in dollars)                                                                                         |  | 2, 23  |  |                                 |   |  | 0.84        |   |  | 1.89        |   |  |            |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  
|Earnings per share - diluted (in dollars)                                                                                       |  | 2, 23  |  |                                 |   |  | 0.83        |   |  | 1.86        |   |  |            |  
|                                                                                                                                |  |        |  |                                 |   |  |             |   |  |             |   |  |            |  



The accompanying
notes are an integral part of these consolidated financial statements



F-4



---

##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES



CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY



(Expressed in thousands)



|                                                                                                                             |  |               |  |            |  |                |                   |  |                |                                       |  |              |                                 |                        |   |               |            |   |       |          |   |  |             |   |  |             |  
|---------------------------------------------------------------------------------------------------------------------------- |  | ------------- |  | ---------- |  | -------------- | ----------------- |  | -------------- | ------------------------------------- |  | ------------ | ------------------------------- | ---------------------- | - | ------------- | ---------- | - | ----- | -------- | - |  | ----------- | - |  | ----------- | -
|                                                                                                                             |  | Capital Stock |  |            |  |                | Retained Earnings |  |                | UnrealizedLoss onLong-termInvestments |  |              | CumulativeTranslationAdjustment |                        |   | TreasuryStock |            |   | Total |         
|                                                                                                                             |  | CommonStock   |  | Shares     |  | CapitalReserve |                   |  | SpecialReserve |                                       |  | LegalReserve |                                 | UnappropriatedEarnings |   |               |            |   |      
|                                                                                                                             |  | NT$           |  |            |  | NT$            |                   |  | NT$            |                                       |  | NT$          |                                 | NT$                    |   |               | NT$        |   |       | NT$      |   |  | NT$         |   |  | NT$         |  
|Balance at January 1, 2002                                                                                                   |  | 133,356,954   |  | 13,335,695 |  | 82,115,682     |                   |  | 2,242,284      |                                       |  | 10,686,225   |                                 | 21,223,870             |   |               | (470,931   | ) |       | (160,470 | ) |  | (35,671,361 | ) |  | 213,322,253 |  
|Appropriation of 2001 retained earnings                                                                                      |  |               |  |            |  |                |                   |  |                |                                       |  |              |                                 |                        |   |               |            |   |       |          |   |  |             |   |  |             |  
|Special reserve                                                                                                              |  |              |  |           |  |               |                   |  | (1,610,302     | )                                     |  |             |                                 | 1,610,302              |   |               |           |   |       |         |   |  |            |   |  |            |  
|Stock dividends                                                                                                              |  | 19,680,182    |  | 1,968,018  |  |               |                   |  |               |                                       |  |             |                                 | (19,680,182            | ) |               |           |   |       |         |   |  |            |   |  |            |  
|Employees bonus                                                                                                             |  | 1,711,320     |  | 171,132    |  |               |                   |  |               |                                       |  |             |                                 | (1,711,320             | ) |               |           |   |       |         |   |  |            |   |  |            |  
|Purchase of treasury stock                                                                                                   |  |              |  |           |  |               |                   |  |               |                                       |  |             |                                 |                       |   |               |           |   |       |         |   |  | (2,739,918  | ) |  | (2,739,918  | )
|Treasury stock held by unconsolidated subsidiaries                                                                           |  |              |  |           |  |               |                   |  |               |                                       |  |             |                                 |                       |   |               |           |   |       |         |   |  | (171,840    | ) |  | (171,840    | )
|Net income in 2002                                                                                                           |  |              |  |           |  |               |                   |  |               |                                       |  |             |                                 | 7,072,032              |   |               |           |   |       |         |   |  |            |   |  | 7,072,032   |  
|Transfer of capital reserve arising from gain on disposal of property, plant and equipment to retained earnings              |  |              |  |           |  | (170,473       | )                 |  |               |                                       |  |             |                                 | 170,473                |   |               |           |   |       |         |   |  |            |   |  |            |  
|Transfer of capital reserve arising from gain on disposal of property, plant and equipment of investees to retained earnings |  |              |  |           |  | (672           | )                 |  |               |                                       |  |             |                                 | 672                    |   |               |           |   |       |         |   |  |            |   |  |            |  
|Adjustment of capital reserve accounted for under the equity method                                                          |  |              |  |           |  | (69,046        | )                 |  |               |                                       |  |             |                                 |                       |   |               |           |   |       |         |   |  |            |   |  | (69,046     | )
|Changes in unrealized loss on long-term investments of investees                                                             |  |              |  |           |  |               |                   |  |               |                                       |  |             |                                 |                       |   |               | (878,317   | ) |       |         |   |  |            |   |  | (878,317    | )
|Changes in cumulative translation adjustment                                                                                 |  |              |  |           |  |               |                   |  |               |                                       |  |             |                                 |                       |   |               |           |   |       | 889,321  |   |  |            |   |  | 889,321     |  
|                                                                                                                             |  |               |  |            |  |                |                   |  |                |                                       |  |              |                                 |                        |   |               |            |   |       |          |   |  |             |   |  |             |  
|Balance at December 31, 2002                                                                                                 |  | 154,748,456   |  | 15,474,845 |  | 81,875,491     |                   |  | 631,982        |                                       |  | 10,686,225   |                                 | 8,685,847              |   |               | (1,349,248 | ) |       | 728,851  |   |  | (38,583,119 | ) |  | 217,424,485 |  
|                                                                                                                             |  |               |  |            |  |                |                   |  |                |                                       |  |              |                                 |                        |   |               |            |   |       |          |   |  |             |   |  |             |  



The accompanying
notes are an integral part of these consolidated financial statements



F-5



---

##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES



CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY
(Continued)



(Expressed in thousands)



|                                                                                                                             |  |               |  |            |  |                |                   |  |                |                                       |              |  |                                 |   |               |            |   |       |         |  |             |   |  |             |  
|---------------------------------------------------------------------------------------------------------------------------- |  | ------------- |  | ---------- |  | -------------- | ----------------- |  | -------------- | ------------------------------------- | ------------ |  | ------------------------------- | - | ------------- | ---------- | - | ----- | ------- |  | ----------- | - |  | ----------- | -
|                                                                                                                             |  | Capital Stock |  |            |  |                | Retained Earnings |  |                | UnrealizedLoss onLong-termInvestments |              |  | CumulativeTranslationAdjustment |   | TreasuryStock |            |   | Total |        
|                                                                                                                             |  | CommonStock   |  | Shares     |  | CapitalReserve |                   |  | SpecialReserve |                                       | LegalReserve |  | UnappropriatedEarnings          |   |               |            |   |      
|                                                                                                                             |  | NT$           |  |            |  | NT$            |                   |  | NT$            |                                       | NT$          |  | NT$                             |   |               | NT$        |   |       | NT$     |  | NT$         |   |  | NT$         |  
|Balance at January 1, 2003                                                                                                   |  | 154,748,456   |  | 15,474,845 |  | 81,875,491     |                   |  | 631,982        |                                       | 10,686,225   |  | 8,685,847                       |   |               | (1,349,248 | ) |       | 728,851 |  | (38,583,119 | ) |  | 217,424,485 |  
|Appropriation of 2002 retained earnings                                                                                      |  |               |  |            |  |                |                   |  |                |                                       |              |  |                                 |   |               |            |   |       |         |  |             |   |  |             |  
|Legal reserve                                                                                                                |  |              |  |           |  |               |                   |  |               |                                       | 724,250      |  | (724,250                        | ) |               |           |   |       |        |  |            |   |  |            |  
|Special reserve                                                                                                              |  |              |  |           |  |               |                   |  | 715,012        |                                       |             |  | (715,012                        | ) |               |           |   |       |        |  |            |   |  |            |  
|Stock dividends                                                                                                              |  | 6,079,252     |  | 607,926    |  |               |                   |  |               |                                       |             |  | (6,079,252                      | ) |               |           |   |       |        |  |            |   |  |            |  
|Directors and supervisors remuneration                                                                                     |  |              |  |           |  |               |                   |  |               |                                       |             |  | (5,650                          | ) |               |           |   |       |        |  |            |   |  | (5,650      | )
|Employees bonus                                                                                                             |  | 579,727       |  | 57,973     |  |               |                   |  |               |                                       |             |  | (579,727                        | ) |               |           |   |       |        |  |            |   |  |            |  
|Purchase of treasury stock                                                                                                   |  |              |  |           |  |               |                   |  |               |                                       |             |  |                                |   |               |           |   |       |        |  | (2,056,064  | ) |  | (2,056,064  | )
|Treasury stock transferred to employees                                                                                      |  |              |  |           |  |               |                   |  |               |                                       |             |  | (565,716                        | ) |               |           |   |       |        |  | 3,773,306   |   |  | 3,207,590   |  
|Net income in 2003                                                                                                           |  |              |  |           |  |               |                   |  |               |                                       |             |  | 14,020,257                      |   |               |           |   |       |        |  |            |   |  | 14,020,257  |  
|Transfer of capital reserve arising from gain on disposal of property, plant and equipment of investees to retained earnings |  |              |  |           |  | (325           | )                 |  |               |                                       |             |  | 325                             |   |               |           |   |       |        |  |            |   |  |            |  
|Adjustment of capital reserve accounted for under the equity method                                                          |  |              |  |           |  | (1,800,982     | )                 |  |               |                                       |             |  |                                |   |               |           |   |       |        |  |            |   |  | (1,800,982  | )
|Changes in unrealized loss on long-term investments of investees                                                             |  |              |  |           |  |               |                   |  |               |                                       |             |  |                                |   |               | 1,258,384  |   |       |        |  |            |   |  | 1,258,384   |  
|Changes in cumulative translation adjustment                                                                                 |  |              |  |           |  |               |                   |  |               |                                       |             |  |                                |   |               |           |   |       | 185,026 |  |            |   |  | 185,026     |  
|                                                                                                                             |  |               |  |            |  |                |                   |  |                |                                       |              |  |                                 |   |               |            |   |       |         |  |             |   |  |             |  
|Balance at December 31, 2003                                                                                                 |  | 161,407,435   |  | 16,140,744 |  | 80,074,184     |                   |  | 1,346,994      |                                       | 11,410,475   |  | 14,036,822                      |   |               | (90,864    | ) |       | 913,877 |  | (36,865,877 | ) |  | 232,233,046 |  
|                                                                                                                             |  |               |  |            |  |                |                   |  |                |                                       |              |  |                                 |   |               |            |   |       |         |  |             |   |  |             |  



The accompanying
notes are an integral part of these consolidated financial statements



F-6



---

##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES



CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS EQUITY
(Continued)



(Expressed in thousands)



|                                                                    |  |               |   |  |            |   |                   |                            |  |                                       |   |  |                                 |   |  |               |  |                        |       |  |          |   |  |            |   |  |             |   |  |             |  
|------------------------------------------------------------------- |  | ------------- | - |  | ---------- | - | ----------------- | -------------------------- |  | ------------------------------------- | - |  | ------------------------------- | - |  | ------------- |  | ---------------------- | ----- |  | -------- | - |  | ---------- | - |  | ----------- | - |  | ----------- | -
|                                                                    |  | Capital Stock |   |  |            |   | Retained Earnings |                            |  | UnrealizedLoss onLong-termInvestments |   |  | CumulativeTranslationAdjustment |   |  | TreasuryStock |  |                        | Total | 
|                                                                    |  | CommonStock   |   |  | Shares     |   |                   | CapitalCollected inAdvance |  | CapitalReserve                        |   |  | SpecialReserve                  |   |  | LegalReserve  |  | UnappropriatedEarnings |       |  |          |   | 
|                                                                    |  | NT$           |   |  |            |   |                   | NT$                        |  | NT$                                   |   |  | NT$                             |   |  | NT$           |  | NT$                    |       |  | NT$      |   |  | NT$        |   |  | NT$         |   |  | NT$         |  
|Balance at January 1, 2004                                          |  | 161,407,435   |   |  | 16,140,744 |   |                   |                           |  | 80,074,184                            |   |  | 1,346,994                       |   |  | 11,410,475    |  | 14,036,822             |       |  | (90,864  | ) |  | 913,877    |   |  | (36,865,877 | ) |  | 232,233,046 |  
|Appropriation of 2003 retained earnings                             |  |               |   |  |            |   |                   |                            |  |                                       |   |  |                                 |   |  |               |  |                        |       |  |          |   |  |            |   |  |             |   |  |             |  
|Legal reserve                                                       |  |              |   |  |           |   |                   |                           |  |                                      |   |  |                                |   |  | 1,402,026     |  | (1,402,026             | )     |  |         |   |  |           |   |  |            |   |  |            |  
|Special reserve                                                     |  |              |   |  |           |   |                   |                           |  |                                      |   |  | (1,256,123                      | ) |  |              |  | 1,256,123              |       |  |         |   |  |           |   |  |            |   |  |            |  
|Stock dividends                                                     |  | 12,224,284    |   |  | 1,222,428  |   |                   |                           |  |                                      |   |  |                                |   |  |              |  | (12,224,284            | )     |  |         |   |  |           |   |  |            |   |  |            |  
|Directors and supervisors remuneration                            |  |              |   |  |           |   |                   |                           |  |                                      |   |  |                                |   |  |              |  | (12,618                | )     |  |         |   |  |           |   |  |            |   |  | (12,618     | )
|Employees bonus                                                    |  | 1,111,273     |   |  | 111,127    |   |                   |                           |  |                                      |   |  |                                |   |  |              |  | (1,111,273             | )     |  |         |   |  |           |   |  |            |   |  |            |  
|Transfer of capital reserve to common stock                         |  | 661,298       |   |  | 66,130     |   |                   |                           |  | (661,298                              | ) |  |                                |   |  |              |  |                       |       |  |         |   |  |           |   |  |            |   |  |            |  
|Stock issued for merger                                             |  | 3,571,429     |   |  | 357,143    |   |                   |                           |  | 6,100,571                             |   |  |                                |   |  |              |  |                       |       |  |         |   |  |           |   |  |            |   |  | 9,672,000   |  
|Purchase of treasury stock                                          |  |              |   |  |           |   |                   |                           |  |                                      |   |  |                                |   |  |              |  |                       |       |  |         |   |  |           |   |  | (5,198,020  | ) |  | (5,198,020  | )
|Cancellation of treasury stock                                      |  | (1,497,280    | ) |  | (149,728   | ) |                   |                           |  | (538,107                              | ) |  |                                |   |  |              |  | (2,887,796             | )     |  |         |   |  |           |   |  | 4,923,183   |   |  |            |  
|Exercise of emloyees stock options                                 |  | 441,380       |   |  | 44,138     |   |                   | 4,040                      |  | 342,973                               |   |  |                                |   |  |              |  |                       |       |  |         |   |  |           |   |  |            |   |  | 788,393     |  
|Net income in 2004                                                  |  |              |   |  |           |   |                   |                           |  |                                      |   |  |                                |   |  |              |  | 31,843,381             |       |  |         |   |  |           |   |  |            |   |  | 31,843,381  |  
|Adjustment of capital reserve accounted for under the equity method |  |              |   |  |           |   |                   |                           |  | (385,128                              | ) |  |                                |   |  |              |  |                       |       |  |         |   |  |           |   |  |            |   |  | (385,128    | )
|Changes in unrealized loss on long-term investments of investees    |  |              |   |  |           |   |                   |                           |  |                                      |   |  |                                |   |  |              |  |                       |       |  | (333,849 | ) |  |           |   |  |            |   |  | (333,849    | )
|Changes in cumulative translation adjustment                        |  |              |   |  |           |   |                   |                           |  |                                      |   |  |                                |   |  |              |  |                       |       |  |         |   |  | (2,233,329 | ) |  |            |   |  | (2,233,329  | )
|                                                                    |  |               |   |  |            |   |                   |                            |  |                                       |   |  |                                 |   |  |               |  |                        |       |  |          |   |  |            |   |  |             |   |  |             |  
|Balance at December 31, 2004 (in NT$)                               |  | 177,919,819   |   |  | 17,791,982 |   |                   | 4,040                      |  | 84,933,195                            |   |  | 90,871                          |   |  | 12,812,501    |  | 29,498,329             |       |  | (424,713 | ) |  | (1,319,452 | ) |  | (37,140,714 | ) |  | 266,373,876 |  
|                                                                    |  |               |   |  |            |   |                   |                            |  |                                       |   |  |                                 |   |  |               |  |                        |       |  |          |   |  |            |   |  |             |   |  |             |  
|Balance at December 31, 2004 (in US$)                               |  | 5,605,540     |   |  |            |   |                   | 127                        |  | 2,675,904                             |   |  | 2,863                           |   |  | 403,670       |  | 929,374                |       |  | (13,381  | ) |  | (41,571    | ) |  | (1,170,155  | ) |  | 8,392,371   |  
|                                                                    |  |               |   |  |            |   |                   |                            |  |                                       |   |  |                                 |   |  |               |  |                        |       |  |          |   |  |            |   |  |             |   |  |             |  



The accompanying
notes are an integral part of these consolidated financial statements



F-7



---

##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Expressed in thousands)



|                                                                                            |  |                                 |   |  |             |   |  |             |   |  |            |  
|------------------------------------------------------------------------------------------- |  | ------------------------------- | - |  | ----------- | - |  | ----------- | - |  | ---------- | -
|                                                                                            |  | For the year ended December 31, |  
|                                                                                            |  | 2002                            |   |  | 2003        |   |  | 2004        |  
|                                                                                            |  | NT$                             |   |  | NT$         |   |  | NT$         |   |  | US$        |  
|Cash flows from operating activities:                                                       |  |                                 |   |  |             |   |  |             |   |  |            |  
|Net income                                                                                  |  | 7,072,032                       |   |  | 14,020,257  |   |  | 31,843,381  |   |  | 1,003,257  |  
|Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |                                 |   |  |             |   |  |             |   |  |            |  
|Minority interests                                                                          |  | (326,515                        | ) |  | (304,021    | ) |  | (472,612    | ) |  | (14,890    | )
|Depreciation                                                                                |  | 36,567,535                      |   |  | 39,233,479  |   |  | 45,589,891  |   |  | 1,436,354  |  
|Amortization                                                                                |  | 1,699,766                       |   |  | 1,629,854   |   |  | 1,582,524   |   |  | 49,859     |  
|Loss (recovery) on decline in market value of marketable securities                         |  | 10,806                          |   |  | (10,806     | ) |  | 58,853      |   |  | 1,854      |  
|Bad debt expenses (Reversal on allowance for doubtful accounts)                             |  | (66,512                         | ) |  | 80,249      |   |  | 103,259     |   |  | 3,253      |  
|Loss on decline in market value and obsolescence of inventories                             |  | 955,074                         |   |  | 1,443,565   |   |  | 1,884,466   |   |  | 59,372     |  
|Investment income accounted for under the equity method                                     |  | (230,600                        | ) |  | (300,724    | ) |  | (551,779    | ) |  | (17,384    | )
|Cash dividends received under the equity method                                             |  | 156,820                         |   |  | 273,762     |   |  | 564,897     |   |  | 17,798     |  
|Impairment loss on long-term investments                                                    |  | 1,408,565                       |   |  | 1,866,454   |   |  | 414,676     |   |  | 13,065     |  
|Write-off of deferred charges                                                               |  |                                |   |  |            |   |  | 269,325     |   |  | 8,485      |  
|Gain on disposal of investments                                                             |  | (8,473,213                      | ) |  | (6,885,374  | ) |  | (12,868,569 | ) |  | (405,437   | )
|Loss (gain) on disposal of property, plant and equipment                                    |  | 30,532                          |   |  | (23,832     | ) |  | 97,009      |   |  | 3,056      |  
|(Gain) loss on reacquisition of bonds                                                       |  | (256,204                        | ) |  | (145,019    | ) |  | 59          |   |  | 2          |  
|Amortization of bond premiums                                                               |  |                                |   |  | (19,386     | ) |  | (10,050     | ) |  | (317       | )
|Gain on settlement of exchangeable bonds                                                    |  | (145,671                        | ) |  | (519,544    | ) |  | (356,521    | ) |  | (11,233    | )
|Changes in assets and liabilities:                                                          |  |                                 |   |  |             |   |  |             |   |  |            |  
|Notes receivable                                                                            |  | 217,922                         |   |  | (25,138     | ) |  | 69,435      |   |  | 2,188      |  
|Accounts receivable                                                                         |  | (3,380,836                      | ) |  | (6,919,470  | ) |  | 976,727     |   |  | 30,773     |  
|Other receivables                                                                           |  | (55,869                         | ) |  | 2,719,915   |   |  | 121,313     |   |  | 3,822      |  
|Inventories                                                                                 |  | (3,638,525                      | ) |  | (1,331,056  | ) |  | (2,832,846  | ) |  | (89,252    | )
|Prepaid expenses                                                                            |  | (1,605                          | ) |  | 124,294     |   |  | 836,340     |   |  | 26,350     |  
|Deferred income tax assets                                                                  |  | 125,072                         |   |  | 853,864     |   |  | 280,824     |   |  | 8,848      |  
|Other current assets                                                                        |  |                                |   |  | (139        | ) |  | 1,268,347   |   |  | 39,960     |  
|Notes payable                                                                               |  | 245                             |   |  | (245        | ) |  | 35,605      |   |  | 1,122      |  
|Accounts payable                                                                            |  | 443,884                         |   |  | 1,971,892   |   |  | 2,504,155   |   |  | 78,896     |  
|Income tax payable                                                                          |  | 283,728                         |   |  | (64,417     | ) |  | (182,728    | ) |  | (5,757     | )
|Accrued expenses                                                                            |  | (1,373,026                      | ) |  | 1,162,050   |   |  | 3,812,541   |   |  | 120,118    |  
|Other current liabilities                                                                   |  | 2,674                           |   |  | 352,182     |   |  | 316,746     |   |  | 9,979      |  
|Compensation interest payable                                                               |  | 78,977                          |   |  | 67,938      |   |  | (126,111    | ) |  | (3,973     | )
|Accrued pension liabilities                                                                 |  | 450,060                         |   |  | 299,270     |   |  | 435,909     |   |  | 13,734     |  
|Capacity deposits                                                                           |  | (1,028,162                      | ) |  | 74,820      |   |  | (1,725,822  | ) |  | (54,374    | )
|Other long-term liabilities                                                                 |  |                                |   |  | 313         |   |  | (1,314      | ) |  | (41        | )
|                                                                                            |  |                                 |   |  |             |   |  |             |   |  |            |  
|Net cash provided by operating activities                                                   |  | 30,526,954                      |   |  | 49,624,987  |   |  | 73,937,930  |   |  | 2,329,487  |  
|                                                                                            |  |                                 |   |  |             |   |  |             |   |  |            |  
|Cash flows from investing activities:                                                       |  |                                 |   |  |             |   |  |             |   |  |            |  
|(Increase) decrease in marketable securities, net                                           |  | (839,551                        | ) |  | 723,834     |   |  | (569,735    | ) |  | (17,950    | )
|(Increase) decrease in other financial assets, net                                          |  | (6,853,960                      | ) |  | 2,665,117   |   |  | 1,503,980   |   |  | 47,384     |  
|Acquisition of long-term investments                                                        |  | (3,754,478                      | ) |  | (9,849,367  | ) |  | (5,560,766  | ) |  | (175,197   | )
|Proceeds from disposal of long-term investments                                             |  | 12,385,637                      |   |  | 11,041,934  |   |  | 8,254,496   |   |  | 260,066    |  
|Withdrawal of prepayments for long-term investments                                         |  |                                |   |  |            |   |  | 70,383      |   |  | 2,217      |  
|Acquisition of minority interests                                                           |  |                                |   |  | (4,168,706  | ) |  | (6,814,323  | ) |  | (214,692   | )
|Acquisition of property, plant and equipment                                                |  | (35,977,747                     | ) |  | (24,819,683 | ) |  | (81,110,208 | ) |  | (2,555,457 | )
|Proceeds from disposal of property, plant and equipment                                     |  | 333,180                         |   |  | 840,760     |   |  | 718,470     |   |  | 22,636     |  
|Increase in deferred charges                                                                |  | (1,695,110                      | ) |  | (675,460    | ) |  | (978,741    | ) |  | (30,836    | )
|Decrease in other assets, net                                                               |  | 29,293                          |   |  | 127,139     |   |  | 1,354,137   |   |  | 42,664     |  
|Acquisition of subsidiaries                                                                 |  | (65,988                         | ) |  |            |   |  |            |   |  |           |  
|                                                                                            |  |                                 |   |  |             |   |  |             |   |  |            |  
|Net cash used in investing activities                                                       |  | (36,438,724                     | ) |  | (24,114,432 | ) |  | (83,132,307 | ) |  | (2,619,165 | )
|                                                                                            |  |                                 |   |  |             |   |  |             |   |  |            |  



The accompanying
notes are an integral part of these consolidated financial statements



F-8



---

##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)

(Expressed in thousands)



|                                                                      |  |                                 |   |  |             |   |  |             |   |  |           |  
|--------------------------------------------------------------------- |  | ------------------------------- | - |  | ----------- | - |  | ----------- | - |  | --------- | -
|                                                                      |  | For the year ended December 31, |  
|                                                                      |  | 2002                            |   |  | 2003        |   |  | 2004        |  
|                                                                      |  | NT$                             |   |  | NT$         |   |  | NT$         |   |  | US$       |  
|Cash flows from financing activities:                                 |  |                                 |   |  |             |   |  |             |   |  |           |  
|Increase in short-term loans, net                                     |  | 388,100                         |   |  | 615,040     |   |  | 655,873     |   |  | 20,664    |  
|Proceeds from long-term loans                                         |  | 4,425,000                       |   |  | 680,400     |   |  | 23,075,700  |   |  | 727,023   |  
|Repayment of long-term loans                                          |  | (10,047,079                     | ) |  | (14,269,647 | ) |  | (9,366,412  | ) |  | (295,098  | )
|Proceeds from bonds issued                                            |  | 13,097,062                      |   |  | 29,095,410  |   |  |            |   |  |          |  
|Redemption of bonds                                                   |  | (1,140,000                      | ) |  | (2,209,104  | ) |  | (16,336,953 | ) |  | (514,712  | )
|Reacquisition of bonds                                                |  | (879,100                        | ) |  | (2,156,908  | ) |  | (41,392     | ) |  | (1,304    | )
|Remuneration paid to directors and supervisors                        |  |                                |   |  | (5,650      | ) |  | (12,618     | ) |  | (398      | )
|Increase in deposits-in, net                                          |  | 1,152                           |   |  | 5,147       |   |  | 5,513       |   |  | 174       |  
|Purchase of treasury stock                                            |  | (2,877,190                      | ) |  | (2,262,897  | ) |  | (5,758,968  | ) |  | (181,442  | )
|Exercise of employee stock options                                    |  |                                |   |  | 42,934      |   |  | 788,393     |   |  | 24,839    |  
|Treasury stock transferred to employees                               |  |                                |   |  | 3,207,590   |   |  |            |   |  |          |  
|Proceeds from minority shareholders on stock issuance of subsidiaries |  | 194,341                         |   |  | 4,838,835   |   |  | 158,608     |   |  | 4,997     |  
|                                                                      |  |                                 |   |  |             |   |  |             |   |  |           |  
|Net cash provided by (used in) financing activities                   |  | 3,162,286                       |   |  | 17,581,150  |   |  | (6,832,256  | ) |  | (215,257  | )
|Effect of exchange rate changes on cash and cash equivalents          |  | 747,864                         |   |  | 777,620     |   |  | (1,363,167  | ) |  | (42,948   | )
|                                                                      |  |                                 |   |  |             |   |  |             |   |  |           |  
|Net increase (decrease) in cash and cash equivalents                  |  | (2,001,620                      | ) |  | 43,869,325  |   |  | (17,389,800 | ) |  | (547,883  | )
|Cash and cash equivalents at beginning of year                        |  | 76,904,068                      |   |  | 74,902,448  |   |  | 118,771,773 |   |  | 3,742,022 |  
|                                                                      |  |                                 |   |  |             |   |  |             |   |  |           |  
|Cash and cash equivalents at end of year                              |  | 74,902,448                      |   |  | 118,771,773 |   |  | 101,381,973 |   |  | 3,194,139 |  
|                                                                      |  |                                 |   |  |             |   |  |             |   |  |           |  
|Supplemental disclosures of cash flow information :                   |  |                                 |   |  |             |   |  |             |   |  |           |  
|Cash paid for interest                                                |  | 1,993,014                       |   |  | 1,581,736   |   |  | 1,974,367   |   |  | 62,204    |  
|                                                                      |  |                                 |   |  |             |   |  |             |   |  |           |  
|Cash paid for income tax                                              |  | 198,036                         |   |  | 94,841      |   |  | 296,820     |   |  | 9,352     |  
|                                                                      |  |                                 |   |  |             |   |  |             |   |  |           |  
|Investing activities partially paid by cash :                         |  |                                 |   |  |             |   |  |             |   |  |           |  
|Acquisition of property, plant and equipment                          |  | 32,284,302                      |   |  | 23,401,654  |   |  | 81,726,103  |   |  | 2,574,861 |  
|Add: Payable at beginning of year                                     |  | 12,482,283                      |   |  | 8,788,838   |   |  | 7,370,809   |   |  | 232,225   |  
|Add: Transferred from merger with SiSMC                               |  |                                |   |  |            |   |  | 84,675      |   |  | 2,668     |  
|Less: Payable at end of year                                          |  | (8,788,838                      | ) |  | (7,370,809  | ) |  | (8,071,379  | ) |  | (254,297  | )
|                                                                      |  |                                 |   |  |             |   |  |             |   |  |           |  
|Cash paid for acquiring property, plant and equipment                 |  | 35,977,747                      |   |  | 24,819,683  |   |  | 81,110,208  |   |  | 2,555,457 |  
|                                                                      |  |                                 |   |  |             |   |  |             |   |  |           |  
|Investing and financing activities not affecting cash flows :         |  |                                 |   |  |             |   |  |             |   |  |           |  
|Principal amount of exchangeable bonds exchanged by bondholders       |  |                                |   |  | 194,304     |   |  | 11,614,141  |   |  | 365,915   |  
|Book value of reference shares delivered for exchange                 |  |                                |   |  | (75,505     | ) |  | (3,898,638  | ) |  | (122,830  | )
|Elimination of related balance sheet accounts                         |  |                                |   |  | 4,348       |   |  | 90,983      |   |  | 2,866     |  
|                                                                      |  |                                 |   |  |             |   |  |             |   |  |           |  
|Recognition of gain on disposal of investments                        |  |                                |   |  | 123,147     |   |  | 7,806,486   |   |  | 245,951   |  
|                                                                      |  |                                 |   |  |             |   |  |             |   |  |           |  



The accompanying
notes are an integral part of these consolidated financial statements



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##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



1. General Descriptions of Reporting
Entities



United Microelectronics Corporation (the Company)
was incorporated in May 1980 and commenced operations in April 1982. The Company is a full service semiconductor wafer foundry, and provides a variety of services to fit individual customer needs. These services include intellectual property,
embedded IC design, design verification, mask tooling, wafer fabrication, and testing. The Companys common shares were publicly listed on the Taiwan Stock Exchange (TSE) in July 1985 and its American Depositary Shares (ADSs) were listed on the
New York Stock Exchange (NYSE) in September 2000.



Based on
the resolution of the board of directors meeting on February 26, 2004, the effective date of the merger with SiS Microelectronics Corp. (SiSMC) was July 1, 2004. The Company was the surviving company, and SiSMC was the dissolved company. The
merger was approved by the relevant government authorities. All the assets, liabilities, rights, and obligations of SiSMC have been fully incorporated into the Company since July 1, 2004.



The Companys consolidated financial statements include the financial
statements of the Company and the following subsidiaries (hereinafter referred to collectively as the Group):



Hsun Chieh Investment Co., Ltd. (Hsun Chieh) was incorporated in January 2000 and is engaged in the business of investments. The Company owned 99.97% of
interest in Hsun Chieh as of December 31, 2003 and 2004.



UMC
Japan (UMCJ) was incorporated in May 1984 in Japan and is engaged in the business of sales and manufacturing of integrated circuit. The Group owned 51.89% and 51.93 % of interest in UMCJ as of December 31, 2003 and 2004, respectively.



UMC Group (USA) (UMC-USA) was incorporated in August 1997 and is engaged in
the business of sales of semiconductor products and providing related foundry services. The Company owned 100% of interest in UMC-USA as of December 31, 2003 and 2004.



UMCi Ltd. (UMCi) was incorporated in January 2001 and is engaged in the business of sales and manufacturing of integrated
circuit. The Group owned 77.72% of interest in UMCi as of December 31, 2003, and the Company owned 100% of interest in UMCi as of December 31, 2004.



United Microelectronics (Europe) B.V. (UME BV) was incorporated in May 1989 and is engaged in the business of sales of semiconductor products and
providing related foundry services. The Company acquired UME BV in May 2002, and owned 100% of interest as of December 31, 2003 and 2004.



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##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



United Microdisplay Optronics Corp. (UMO) was incorporated in September 2002 and is engaged in the
business of sales and manufacturing of chips for Liquid Crystal on Silicon (LCOS). The Company owned 83.48% of interest in UMO as of December 31, 2003 and 2004.



Fortune Venture Capital Corporation (Fortune), Unitruth Investment Corp., UMC Capital Corporation, United Microelectronics
Corp. (Samoa), and United Foundry Service, Inc. were excluded from the consolidation (see Note 2Principles of Consolidation).



2. Summary of Significant Accounting Policies



The financial statements were prepared in conformity with the Guidelines Governing the Preparation of Financial Reports by Securities Issuers
and accounting principles generally accepted in the Republic of China (ROC).



Summary of significant accounting polices is as follows:



Principles of Consolidation



The consolidated financial statements include the accounts of the Company and certain majority- owned (above 50%) subsidiaries in accordance with the requirements of the Statements of Financial Accounting Standards of
the Republic of China (ROC SFAS) No. 7. All intercompany accounts and transactions have been eliminated in the consolidated financial statements.



Pursuant to ROC SFAS NO.7, if the total assets and operating revenues of a subsidiary are less than 10% of the non-consolidated total assets and operating
revenues of the Company, respectively, the subsidiarys financial statements may, at the option of the Company, not be consolidated. Irrespective of the above test, when the total combined assets or operating revenues of all such
non-consolidated subsidiaries constitute up to 30% of the Companys non-consolidated total assets or operating revenues, then each individual subsidiary with total assets or operating revenues up to 3% of the Companys non-consolidated
total assets or operating revenues has to be included in the consolidation. Such subsidiaries are included in the consolidated financial statements thereafter, unless the percentage of the combined total assets or operating revenues for all such
subsidiaries becomes less than 20% of the Companys respective non-consolidated amount.



The difference between the acquisition cost and the net equity of the subsidiary is amortized over 5 years.



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##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Foreign Currency Transactions



Transactions denominated in foreign currencies are translated into New
Taiwan Dollars at the exchange rates prevailing on the transaction dates. Receivables, other monetary assets, and liabilities denominated in foreign currencies are translated into New Taiwan Dollars at the exchange rates prevailing on the balance
sheet date. Exchange gains or losses are included in the current years results. However, exchange gains or losses from investments in foreign entities are recorded as cumulative translation adjustments in stockholders equity.



Translation of Foreign Currency Financial Statements



The financial statements of foreign subsidiaries are
translated into New Taiwan Dollars using the spot rates as of each financial statement date for asset and liability accounts, average exchange rates for profit and loss accounts, historical exchange rates for equity accounts, and exchange rates on
dividend declaration date for dividends. The cumulative translation effects from subsidiaries using functional currencies other than the New Taiwan Dollars are included in the cumulative translation adjustment in stockholders equity.



Use of Estimates



The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and assumptions that will affect the amount of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported
amount of revenues and expenses during the reported period. Actual results could differ from those estimates.



Cash Equivalents



Cash equivalents are short-term, highly liquid investments that are readily convertible to known amounts of cash and with maturity dates that do not
present significant risks on changes in value resulting from changes in interest rates, including commercial paper with original maturities of 3 months or less.



Marketable Securities



Marketable securities are recorded at cost when acquired and are stated at the lower of aggregate cost or market value on the balance sheet date. Cash
dividends are recorded as dividend income when received. Costs of money market funds and short-term notes are identified specifically while other marketable securities are determined on the weighted average method. The market values of listed debt,
equity securities, and closed-end funds are determined by the average closing price during the last month of the fiscal year. The market value for open-end funds is determined by the net asset value at the balance sheet date. The amount by which the
aggregate cost exceeds the market value is reported as a loss in the current year. In subsequent periods, recoveries of the market value are recognized as a gain to the extent that the market value does not exceed the original aggregate cost of the
investment.



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##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Allowance for Doubtful Accounts



The allowance for doubtful accounts is provided based on managements
judgment and on the evaluation of collectibility and aging analysis of accounts and other receivables.



Inventories



Inventories are accounted for on a perpetual basis. Raw materials are recorded at actual purchase costs, while the work in process and finished goods are
recorded at standard costs and adjusted to actual costs using the weighted average method at the end of each month. Inventories are stated at the lower of aggregate cost or market value at the balance sheet date. The market values of raw materials
and supplies are determined on the basis of replacement cost while the work in process and finished goods are determined by net realizable values. An allowance for loss on decline in market value and obsolescence is provided, when necessary.



Long-term Investments



Long-term investments are recorded at cost when acquired. Investments
acquired by contribution of technological know-how are credited to deferred credits among affiliates, which will be amortized to income over a period of 5 years.



Investments of less than 20% of the outstanding voting shares in listed investees, where significant influence on operating
decisions of the investees does not reside with the Group, are accounted for by the lower of aggregate cost or market value method. The unrealized loss resulting from the decline in market value of investments that are held for long-term investment
purpose is deducted from the stockholders equity. The market value is determined by the average closing price during the last month of the fiscal year. Investments of less than 20% of the outstanding voting shares in unlisted investees are
accounted for under the cost method. Impairment losses for the investees will be recognized if an other than temporary impairment is evident and the book value after recognizing the losses shall be treated as a new cost basis of such investment.



Investment income or loss from investments in both listed and
unlisted investees is accounted for under the equity method provided that the Group owns at least 20% of the outstanding voting shares of the investees and has significant influence on operational decisions of the investees. The difference of the
acquisition cost and the underlying equity in the investees net assets is amortized over 5 years.



The change in the Groups proportionate share in the net assets of its investee resulting from its subscription to additional shares of stock, issued
by such investee, at the rate not proportionate to its existing equity ownership in such investee, is charged to the capital reserve and long-term investments account.



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##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Unrealized intercompany gains and losses arising from downstream transactions with investees
accounted for under the equity method are eliminated in proportion to the Groups ownership percentage while those from transactions with majority-owned (above 50%) subsidiaries are eliminated entirely. Unrealized intercompany gains and losses
arising from upstream transactions with investees accounted for under the equity method are eliminated in proportion to the Groups ownership percentage. Unrealized intercompany gains and losses arising from transactions between investees
accounted for under the equity method are eliminated in proportion to the multiplication of the Groups ownership percentage; while those arising from transactions between majority-owned subsidiaries are eliminated in proportion to the
Groups ownership percentage in the subsidiary incurred with a gain or loss.



Property, Plant and Equipment



Property, plant and equipment are stated at cost. Interest incurred on loans used to finance the construction of property, plant and equipment is capitalized and depreciated accordingly.



Maintenance and repairs are charged to expense as incurred. Significant
renewals and improvements are treated as capital expenditure and are depreciated accordingly. When property, plant and equipment are disposed, their original cost and accumulated depreciation are written off and the related gain or loss is
classified as non-operating income or expenses. Idle assets are transferred to other assets according to the lower of net book or net realizable value, with the difference charged to non-operating expenses. The corresponding depreciation expenses
provided are also classified as non-operating expenses.



Depreciation is provided on the straight-line basis using the estimated economic life of the assets less salvage value, if any. When the estimated economic life expires, property, plant and equipment, which are still in use, are depreciated
over the newly estimated remaining useful life using the salvage value. The estimated economic life of the property, plant and equipment is as follows: buildings - 3 to 55 years; machinery and equipment - 3 to 6 years; transportation equipment - 2
to 5 years; furniture and fixtures - 2 to 20 years; leased assets and leasehold improvements - the lease period, or estimated economic life, whichever is shorter.



Intangible Assets



Patents are stated at cost and amortized over their estimated economic life using the straight-line method. Technological know-how is stated at cost and
amortized over its estimated economic life using the straight-line method. Goodwill arising from the merger is amortized using the straight-line method over 15 years. At each balance sheet date, the Group assesses whether there is any indication of
impairment other than temporary. If any such indication exists, the recoverable amount is estimated and provision for impairment loss is provided accordingly. The book value after recognizing the impairment loss is recorded as the new cost.



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##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Deferred Charges



Deferred charges are stated at cost and amortized on a straight-line basis as follows: bonds issuance costs  over the
life of the bonds, patent license fees - the term of contract or estimated economic life of the related technology, and software - 3 years.



At each balance sheet date, the Group assesses whether there is any indication of impairment other than temporary. If any such indication exists, the
recoverable amount is estimated and provision for impairment losses is provided accordingly. The book value after recognizing the impairment loss is recorded as the new cost.



Convertible and Exchangeable Bonds



The issuance costs of convertible and exchangeable bonds are classified as deferred charges and amortized over the life of
the bonds.



The excess of the stated redemption price over the
par value is accrued as compensation interest payable over the redemption period, using the effective interest method.



When convertible bondholders exercise their conversion rights, the book value of bonds is credited to common stock at an amount equal to the par value of
the common stock and the excess is credited to capital reserve; no gain or loss is recognized on bond conversion.



When exchangeable bondholders exercise their rights to exchange for the reference shares, the book value of the bond is to be offset against the book
value of the investment in reference shares and the related stockholders equity accounts, with the difference recognized as gain or loss on disposal of investments.



Pension Plan



The net pension cost is computed based on an actuarial valuation in accordance with the provision of the Statements of Financial Accounting Standards of
the Republic of China (ROC SFAS) No. 18, which requires consideration of pension cost components such as service cost, interest cost, expected return on plan assets, and the amortization of net obligation at transition, pension gain or loss, and
prior service cost.



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##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Employee Stock Option Plan



The Group applies intrinsic value method to recognize the difference between
the market price of the stock and the exercise price of its employee stock option as compensation cost. Starting January 1, 2004, the Group also discloses pro forma net income and earnings per share under the fair value method for only these options
granted since January 1, 2004.



Treasury Stock



The Group adopted the ROC SFAS No. 30, which requires that
treasury stock held by the Group itself to be accounted for under the cost method. Cost of treasury stock is shown as a deduction to stockholders equity, while gain or loss from selling treasury stock is treated as an adjustment to the capital
reserve. The Groups stock held by its subsidiaries is also treated as treasury stock in the Groups account.



Revenue Recognition



The main sales term of the Group is Free on Board (FOB) or Free Carrier (FCA). Revenue is recognized when ownership and liability for risk of loss or
damage to the products have been transferred to customers, usually upon shipment. Sales returns and discounts taking into consideration customers complaints and past experiences are accrued in the same year of sales.



Capital Expenditure versus Operating Expenditure



An expenditure is capitalized when it is probable that future economic
benefits associated with the expenditure will flow to the Company and the expenditure amount exceeds a predetermined level. Otherwise it is charged to expense when incurred.



Income Tax



The Group adopted the ROC SFAS No. 22 Accounting for Income Taxes for inter-period and intra-period income tax allocation. Provision for
income tax includes deferred income tax resulting from temporary differences, loss carry-forward and investment tax credits. Deferred income tax assets and liabilities are recognized for the expected tax consequences of temporary differences between
the tax bases of assets and liabilities and their reported amounts in the financial statements using enacted tax rates and laws that will be in effect when the difference is expected to reverse. Valuation allowance on deferred income tax assets is
provided to the extent that it is more likely than not that the tax benefits will not be realized.



According to the ROC SFAS No. 12, the Group recognized the tax benefit from the purchase of equipment and technology, research and development
expenditure, employee training, and certain equity investments.



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##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Income tax (10%) on unappropriated earnings is recorded as expense in the year when the shareholders
have resolved that the earnings shall be retained.



Earnings per Share



Earnings per share
is computed according to the ROC SFAS No. 24. Basic earnings per share is computed by dividing net income (loss) by weighted average number of shares outstanding during the year. Diluted earnings per share is computed by taking basic earnings per
share into consideration plus additional common shares that would have been outstanding if the dilutive share equivalents had been issued. The net income (loss) would also be adjusted for the interest and other income or expenses derived from any
underlying dilutive share equivalents. The weighted average outstanding shares are adjusted retroactively for stock dividends and bonus share issues.



Derivative Financial Instruments



The interest rate swap agreements entered into for hedging purposes are accounted for on a net accrual basis in accordance with the contractual interest
rate as an adjustment to the interest income or expense of the hedged items.



Foreign exchange forward contracts are held to hedge the exchange rate risk arising from net assets or liabilities denominated in foreign currency. These forward contracts are translated and recorded using the spot
rate at the inception of the contracts, and the discount or premium of the forward contracts is amortized over their lifespan. The difference between the spot rate at the inception of a forward contract and the spot rate at the balance sheet date is
reflected in the statement of income. The receivables and payables of the foreign exchange forward contracts are offset and the resulting balances are recorded as either assets or liabilities. Exchange gains or losses from the settlement of forward
contracts are included in the current periods earnings.



Merger



The Company merged with SiSMC
and recognized the sum of the difference between the acquisition costs, which are the market price of equity stocks issued and other related costs, and the fair value of the identifiable net assets acquired as goodwill in compliance with the ROC
SFAS No. 25  Enterprise Mergers - Accounting of Purchase Method. The fair value of identifiable net assets and goodwill deducted from the par value of the equity stocks issued and other related costs is recognized as capital reserve.



3. Accounting Change



None.



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##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



4. Cash and Cash Equivalents



|                                                    |  |                    |   |  |             |  
|--------------------------------------------------- |  | ------------------ | - |  | ----------- | -
|                                                    |  | As of December 31, |  
|                                                    |  | 2003               |   |  | 2004        |  
|                                                    |  | NT$000            |   |  | NT$000     |  
|Cash:                                               |  |                    |   |  |             |  
|Cash on hand                                        |  | 3,344              |   |  | 2,396       |  
|Checking and savings accounts                       |  | 3,263,716          |   |  | 5,963,814   |  
|Time deposits                                       |  | 105,578,263        |   |  | 86,889,832  |  
|                                                    |  |                    |   |  |             |  
|Subtotal                                            |  | 108,845,323        |   |  | 92,856,042  |  
|Cash equivalents:                                   |  |                    |   |  |             |  
|Commercial paper                                    |  | 9,926,450          |   |  | 8,525,931   |  
|                                                    |  |                    |   |  |             |  
|Total                                               |  | 118,771,773        |   |  | 101,381,973 |  
|                                                    |  |                    |   |  |             |  
|                                                    | 
|5. Marketable Securities, Net                       |  |                    |  
|                                                    | 
|                                                    |  | As of December 31, |  
|                                                    |  | 2003               |   |  | 2004        |  
|                                                    |  | NT$000            |   |  | NT$000     |  
|Listed equity securities                            |  | 1,443,545          |   |  | 1,446,302   |  
|Convertible bonds                                   |  | 376,783            |   |  | 1,756,248   |  
|                                                    |  |                    |   |  |             |  
|Total                                               |  | 1,820,328          |   |  | 3,202,550   |  
|Less: Allowance for loss on decline in market value |  |                   |   |  | (58,853     | )
|                                                    |  |                    |   |  |             |  
|Net                                                 |  | 1,820,328          |   |  | 3,143,697   |  
|                                                    |  |                    |   |  |             |  
|                                                    | 
|6. Notes Receivable                                 |  |                    |  
|                                                    | 
|                                                    |  | As of December 31, |  
|                                                    |  | 2003               |   |  | 2004        |  
|                                                    |  | NT$000            |   |  | NT$000     |  
|Notes receivable                                    |  | 8,756              |   |  | 2,040       |  
|                                                    |  |                    |   |  |             |  
|                                                    | 
|7. Accounts Receivable, Net                         |  |                    |  
|                                                    | 
|                                                    |  | As of December 31, |  
|                                                    |  | 2003               |   |  | 2004        |  
|                                                    |  | NT$000            |   |  | NT$000     |  
|Accounts receivable                                 |  | 15,500,554         |   |  | 11,779,505  |  
|Less: Allowance for sales returns and discounts     |  | (325,745           | ) |  | (437,549    | )
|Less: Allowance for doubtful accounts               |  | (95,741            | ) |  | (74,342     | )
|                                                    |  |                    |   |  |             |  
|Net                                                 |  | 15,079,068         |   |  | 11,267,614  |  
|                                                    |  |                    |   |  |             |  



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##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



8. Other Financial Assets, Current



|                                                                            |  |                    |   |  |            |  
|--------------------------------------------------------------------------- |  | ------------------ | - |  | ---------- | -
|                                                                            |  | As of December 31, |  
|                                                                            |  | 2003               |   |  | 2004       |  
|                                                                            |  | NT$000            |   |  | NT$000    |  
|Credit-linked deposits and repackage bonds                                  |  | 4,166,594          |   |  | 2,942,434  |  
|Interest rate swaps                                                         |  | 128,539            |   |  | 35,532     |  
|Forward contracts                                                           |  |                   |   |  | 38,633     |  
|                                                                            |  |                    |   |  |            |  
|Total                                                                       |  | 4,295,133          |   |  | 3,016,599  |  
|Less: Noncurrent portion                                                    |  | (1,848,530         | ) |  | (2,562,754 | )
|                                                                            |  |                    |   |  |            |  
|Net                                                                         |  | 2,446,603          |   |  | 453,845    |  
|                                                                            |  |                    |   |  |            |  
|                                                                            | 
|Please refer to Note 31 for disclosures on risks of other financial assets. |  |                    |  
|                                                                            | 
|9. Inventories, Net                                                         |  |                    |  
|                                                                            | 
|                                                                            |  | As of December 31, |  
|                                                                            |  | 2003               |   |  | 2004       |  
|                                                                            |  | NT$000            |   |  | NT$000    |  
|Raw materials                                                               |  | 209,616            |   |  | 252,847    |  
|Supplies and spare parts                                                    |  | 1,607,312          |   |  | 2,208,545  |  
|Work in process                                                             |  | 6,880,234          |   |  | 7,837,998  |  
|Finished goods                                                              |  | 194,651            |   |  | 1,500,101  |  
|                                                                            |  |                    |   |  |            |  
|Total                                                                       |  | 8,891,813          |   |  | 11,799,491 |  
|Less: Allowance for loss on decline in market value and obsolescence        |  | (521,648           | ) |  | (1,786,493 | )
|                                                                            |  |                    |   |  |            |  
|Net                                                                         |  | 8,370,165          |   |  | 10,012,998 |  
|                                                                            |  |                    |   |  |            |  



| | (1) | The insurance coverage for inventories amounted to NT$8,328 million and NT$11,093 million as of December 31, 2003 and 2004, respectively.
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------



| | (2) | Inventories were not pledged.
| | --- | -----------------------------





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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



10. Long-term Investments



| | (1) | Details of long-term investments are as follows:
| | --- | ------------------------------------------------



(Equity securities refer to common shares unless otherwise stated)



|                                                   |  |                    |  |                                      |  |           |  |                                     
|-------------------------------------------------- |  | ------------------ |  | ------------------------------------ |  | --------- |  | ------------------------------------
|                                                   |  | As of December 31,
|                                                   |  | 2003               |  | 2004                                
|Investee Company                                   |  | Amount             |  | PercentageofOwnershipor VotingRights |  | Amount    |  | PercentageofOwnershipor VotingRights
|                                                   |  | NT$000            |  |                                      |  | NT$000   |  |                                     
|Investments accounted for under the equity method: |  |                    |  |                                      |  |           |  |                                     
|United Foundry Service, Inc.                       |  | 95,484             |  | 100.00                               |  | 103,881   |  | 100.00                              
|UMC Capital Corporation                            |  | 1,265,822          |  | 100.00                               |  | 1,310,493 |  | 100.00                              
|United Microelectronics Corp. (Samoa)              |  | 7,463              |  | 100.00                               |  | 5,854     |  | 100.00                              
|Unitruth Investment Corp.                          |  |                   |  |                                     |  | 100,115   |  | 100.00                              
|Fortune Venture Capital Corporation                |  | 2,280,265          |  | 99.99                                |  | 2,354,878 |  | 99.99                               
|Pacific Venture Capital Co., Ltd                   |  | 313,298            |  | 49.99                                |  | 304,810   |  | 49.99                               
|Thintek Optronics Corp.                            |  | 73,421             |  | 49.99                                |  | 53,618    |  | 49.99                               
|UCA Technology, Inc.                               |  | 49,500             |  | 49.50                                |  | 43,097    |  | 49.50                               
|United Radiotek Incorporation                      |  | 91,426             |  | 49.50                                |  | 86,107    |  | 49.04                               
|Vista Point, Inc.                                  |  | 62,030             |  | 48.77                                |  | 31,263    |  | 48.77                               
|DuPont Photomasks Taiwan Ltd.                      |  | 1,069,669          |  | 45.35                                |  | 1,058,515 |  | 45.35                               
|Unitech Capital Inc.                               |  | 757,050            |  | 42.00                                |  | 730,930   |  | 42.00                               
|UC Fund II                                         |  | 164,162            |  | 35.45                                |  | 150,079   |  | 35.45                               
|Unimicron Technology Corp.                         |  | 4,875,575          |  | 33.41                                |  | 5,280,435 |  | 32.65                               
|RiRa Electronics, Inc.                             |  | 43,355             |  | 32.50                                |  | 13,106    |  | 32.50                               
|Star Semiconductor Corp.                           |  | 47,022             |  | 48.48                                |  | 37,161    |  | 28.20                               
|AFA Technology, Inc.                               |  | 70,372             |  | 48.97                                |  | 42,660    |  | 26.53                               
|Holtek Semiconductor Inc.                          |  | 715,142            |  | 27.59                                |  | 731,442   |  | 25.23                               
|Crystal Media, Inc.                                |  |                   |  |                                     |  | 21,150    |  | 24.88                               
|Faraday Technology Corp.                           |  | 1,918,758          |  | 24.82                                |  | 1,940,771 |  | 23.88                               
|ITE Tech Inc.                                      |  | 341,310            |  | 24.38                                |  | 281,313   |  | 22.23                               
|Novatek Microelectronics Corp. (Note A)            |  | 1,380,336          |  | 20.95                                |  | 1,735,661 |  | 19.12                               
|Ubit Technology, Inc. (Note A)                     |  | 19,900             |  | 39.80                                |  | 17,120    |  | 18.99                               
|Harvatek Corporation (Note A)                      |  | 278,527            |  | 18.84                                |  | 349,074   |  | 18.23                               
|Patentop, Ltd. (Note A)                            |  | 11,688             |  | 18.00                                |  | 6,599     |  | 18.00                               
|AMIC Technology Corporation (Note A)               |  | 142,154            |  | 16.96                                |  | 125,071   |  | 16.82                               



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



|                                                                                             |  |                    |  |                                      |  |            |  |                                     
|-------------------------------------------------------------------------------------------- |  | ------------------ |  | ------------------------------------ |  | ---------- |  | ------------------------------------
|                                                                                             |  | As of December 31,
|                                                                                             |  | 2003               |  | 2004                                
|Investee Company                                                                             |  | Amount             |  | PercentageofOwnershipor VotingRights |  | Amount     |  | PercentageofOwnershipor VotingRights
|                                                                                             |  | NT$000            |  |                                      |  | NT$000    |  |                                     
|Investments accounted for under the equity method: (continued)                               |  |                    |  |                                      |  |            |  |                                     
|Applied Component Technology Corp. (Note A)                                                  |  | 43,872             |  | 21.42                                |  | 19,874     |  | 16.44                               
|Silicon Integrated Systems Corp. (Note C)                                                    |  | 5,288,088          |  | 16.18                                |  | 4,226,303  |  | 16.16                               
|U-Media Technology, Inc. (Note A)                                                            |  |                   |  |                                     |  | 12,000     |  | 11.11                               
|Smedia Technology Corp. (Note A)                                                             |  |                   |  |                                     |  | 18,000     |  | 10.59                               
|SerComm Corporation (Note A)                                                                 |  | 168,827            |  | 10.46                                |  | 174,903    |  | 9.80                                
|AMOD Technology Co., Ltd. (Note A)                                                           |  |                   |  |                                     |  | 5,875      |  | 9.40                                
|Davicom Semiconductor, Inc. (Note A)                                                         |  |                   |  |                                     |  | 22,958     |  | 2.50`                               
|Bravotek Corporation                                                                         |  | 37,500             |  | 50.00                                |  |           |  |                                    
|VastView Technology, Inc.                                                                    |  | 60,567             |  | 33.81                                |  |           |  |                                    
|Chariotek Inc.                                                                               |  | 28,500             |  | 47.50                                |  |           |  |                                    
|Advance Materials Corporation                                                                |  | 166,443            |  | 15.78                                |  |           |  |                                    
|Wiseware Technology Corporation                                                              |  | 37,500             |  | 25.00                                |  |           |  |                                    
|                                                                                             |  |                    |  |                                      |  |            |  |                                     
|Subtotal                                                                                     |  | 21,905,026         |  |                                      |  | 21,395,116 |  |                                     
|                                                                                             |  |                    |  |                                      |  |            |  |                                     
|Investments accounted for under the cost method or the lower of cost or market value method: |  |                    |  |                                      |  |            |  |                                     
|VastView Technology, Inc.                                                                    |  |                   |  |                                     |  | 29,759     |  | 19.94                               
|Kits OnLine Technology Corp.                                                                 |  | 56,231             |  | 15.91                                |  | 56,231     |  | 15.91                               
|Advance Materials Corporation                                                                |  |                   |  |                                     |  | 152,321    |  | 15.78                               
|Everglory Resource Technology Co., Ltd.                                                      |  | 74,000             |  | 15.14                                |  | 74,000     |  | 15.14                               
|LighTuning Tech., Inc.                                                                       |  | 24,772             |  | 15.08                                |  | 24,772     |  | 15.08                               
|Printech International Inc.                                                                  |  | 30,000             |  | 12.00                                |  | 30,000     |  | 12.00                               
|Golden Technology Venture Capital Investment Corp.                                           |  | 80,000             |  | 10.67                                |  | 80,000     |  | 10.67                               
|MediaTek Incorporation                                                                       |  | 1,055,237          |  | 11.13                                |  | 969,048    |  | 10.06                               
|NCTU Spring I Technology Venture Capital Investment Corp.                                    |  | 43,482             |  | 10.06                                |  | 43,482     |  | 10.06                               
|Trendchip Technologies Corp.                                                                 |  | 60,406             |  | 9.25                                 |  | 60,406     |  | 9.25                                
|Incomm Technologies Co., Ltd.                                                                |  | 44,480             |  | 12.60                                |  | 36,140     |  | 8.67                                
|United Industrial Gases Co., Ltd.                                                            |  | 146,250            |  | 8.27                                 |  | 146,250    |  | 8.11                                
|Ralink Technology Corporation                                                                |  | 55,500             |  | 7.40                                 |  | 55,500     |  | 7.40                                
|Subtron Technology Co., Ltd.                                                                 |  | 244,080            |  | 8.14                                 |  | 244,080    |  | 7.29                                



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



|                                                                                                         |  |                    |  |                                      |  |           |  |                                     
|-------------------------------------------------------------------------------------------------------- |  | ------------------ |  | ------------------------------------ |  | --------- |  | ------------------------------------
|                                                                                                         |  | As of December 31,
|                                                                                                         |  | 2003               |  | 2004                                
|Investee Company                                                                                         |  | Amount             |  | PercentageofOwnershipor VotingRights |  | Amount    |  | PercentageofOwnershipor VotingRights
|                                                                                                         |  | NT$000            |  |                                      |  | NT$000   |  |                                     
|Investments accounted for under the cost method or the lower of cost or market value method (continued): |  |                    |  |                                      |  |           |  |                                     
|EE Solution, Inc.                                                                                        |  |                   |  |                                     |  | 51,900    |  | 7.28                                
|Chipsence Corp.                                                                                          |  |                   |  |                                     |  | 41,800    |  | 6.91                                
|Giga Solution Technology Co., Ltd.                                                                       |  |                   |  |                                     |  | 105,000   |  | 6.83                                
|Epitech Corporation                                                                                      |  | 94,613             |  | 6.90                                 |  | 117,823   |  | 6.75                                
|Fortune Semiconductor Corporation                                                                        |  | 71,500             |  | 8.21                                 |  | 71,500    |  | 6.64                                
|NCTU Spring Venture Capital Co., Ltd.                                                                    |  | 20,000             |  | 6.28                                 |  | 20,000    |  | 6.28                                
|Riselink Venture Capital Corp.                                                                           |  |                   |  |                                     |  | 80,000    |  | 6.20                                
|C-Com Corporation                                                                                        |  | 62,681             |  | 14.97                                |  | 9,806     |  | 5.36                                
|Cosmos Technology Venture Capital Investment Corp.                                                       |  | 40,000             |  | 5.03                                 |  | 40,000    |  | 5.03                                
|Parawin Venture Capital Corp.                                                                            |  | 50,000             |  | 5.00                                 |  | 50,000    |  | 5.00                                
|HiTop Communications Corp.                                                                               |  |                   |  |                                     |  | 17,964    |  | 4.99                                
|Industrial Bank of Taiwan Corp.                                                                          |  | 1,150,000          |  | 5.00                                 |  | 1,139,196 |  | 4.95                                
|Programmable Microelectronics (Taiwan) Corp.                                                             |  |                   |  |                                     |  | 23,760    |  | 4.95                                
|Beyond Innovation Technology Co., Ltd.                                                                   |  | 22,158             |  | 8.00                                 |  | 18,096    |  | 4.86                                
|Animation Technologies Corp.                                                                             |  |                   |  |                                     |  | 29,700    |  | 4.74                                
|Coretronic Corporation                                                                                   |  | 276,192            |  | 4.46                                 |  | 276,192   |  | 4.32                                
|Taiwan Asia Pacific Venture Fund                                                                         |  | 29,295             |  | 4.15                                 |  | 21,625    |  | 4.15                                
|IBT Venture Co.                                                                                          |  | 90,000             |  | 3.81                                 |  | 76,142    |  | 3.81                                
|ZyDAS Technology Corp.                                                                                   |  |                   |  |                                     |  | 23,000    |  | 3.33                                
|ProSys Technology Integration, Inc.                                                                      |  | 2,790              |  | 3.08                                 |  | 2,790     |  | 3.08                                
|Brodweb Corp.                                                                                            |  |                   |  |                                     |  | 8,000     |  | 2.86                                
|Billionton Systems Inc.                                                                                  |  | 30,948             |  | 3.05                                 |  | 30,948    |  | 2.77                                
|Uli Electronics Inc.                                                                                     |  |                   |  |                                     |  | 44,940    |  | 2.63                                
|Sheng-Hua Venture Capital Corp.                                                                          |  | 50,000             |  | 2.50                                 |  | 50,000    |  | 2.50                                
|Princeton Technology Corporation                                                                         |  | 97,901             |  | 2.43                                 |  | 97,901    |  | 2.36                                
|Pixart Imaging, Inc.                                                                                     |  | 16,107             |  | 1.91                                 |  | 16,107    |  | 1.84                                
|Taimide Tech., Inc.                                                                                      |  |                   |  |                                     |  | 37,500    |  | 1.83                                
|AU Optronics Corp. (Note B)                                                                              |  | 5,991,447          |  | 9.74                                 |  | 959,082   |  | 1.44                                
|Mega Financial Holding Company                                                                           |  | 4,991,630          |  | 1.36                                 |  | 4,991,630 |  | 1.36                                
|ULTRA CHIP, Inc.                                                                                         |  | 38,000             |  | 3.01                                 |  | 15,048    |  | 1.19                                
|Trident Technologies, Inc.                                                                               |  |                   |  |                                     |  | 12,025    |  | 0.97                                



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



|                                                                                                         |  |                    |   |      |                                      |  |            |   |  |                                     
|-------------------------------------------------------------------------------------------------------- |  | ------------------ | - | ---- | ------------------------------------ |  | ---------- | - |  | ------------------------------------
|                                                                                                         |  | As of December 31,
|                                                                                                         |  | 2003               |   | 2004
|Investee Company                                                                                         |  | Amount             |   |      | PercentageofOwnershipor VotingRights |  | Amount     |   |  | PercentageofOwnershipor VotingRights
|                                                                                                         |  | NT$000            |   |      |                                      |  | NT$000    |   |  |                                     
|Investments accounted for under the cost method or the lower of cost or market value method (continued): |  |                    |   |      |                                      |  |            |   |  |                                     
|Largan Optoelectronics, Co., Ltd.                                                                        |  | 39,866             |   |      | 0.71                                 |  | 39,866     |   |  | 0.69                                
|Premier Image Technology Corporation                                                                     |  | 27,964             |   |      | 0.62                                 |  | 27,964     |   |  | 0.59                                
|Averlogic Corporation                                                                                    |  | 1,391              |   |      | 0.19                                 |  | 1,159      |   |  | 0.16                                
|Taiwan High Speed Rail Corporation (Note D)                                                              |  | 300,000            |   |      |                                     |  | 300,000    |   |  |                                    
|Pacific Technology Partners, L.P. (Note E)                                                               |  | 282,086            |   |      |                                     |  | 336,099    |   |  |                                    
|ForteMedia, Inc. (Note D)                                                                                |  | 108,456            |   |      |                                     |  | 108,456    |   |  |                                    
|Pacific United Technology, L.P. ((Note E)                                                                |  | 69,260             |   |      |                                     |  | 126,560    |   |  |                                    
|Alpha and Omega Semiconductor, Inc. (Note D)                                                             |  | 46,883             |   |      |                                     |  | 46,883     |   |  |                                    
|VenGlobal Capital Fund III, L.P. (Note E)                                                                |  | 33,195             |   |      |                                     |  | 33,195     |   |  |                                    
|Formerica International Holding, Inc. (Note D)                                                           |  | 30,898             |   |      |                                     |  | 30,898     |   |  |                                    
|Aurora Systems, Inc. (Note D)                                                                            |  | 6,355              |   |      |                                     |  | 6,355      |   |  |                                    
|Silicon Data International Co., Ltd.                                                                     |  | 10,200             |   |      | 1.75                                 |  |           |   |  |                                    
|Giga Solution Technology Co., Ltd.                                                                       |  | 105,000            |   |      | 19.44                                |  |           |   |  |                                    
|Enovation Group, Inc.                                                                                    |  | 11,809             |   |      | 14.34                                |  |           |   |  |                                    
|ATP Electronics Taiwan, Inc.                                                                             |  | 50,000             |   |      | 10.00                                |  |           |   |  |                                    
|RF Integration Corporation                                                                               |  | 98,610             |   |      | 9.76                                 |  |           |   |  |                                    
|Union Technology Corp.                                                                                   |  | 18,000             |   |      | 5.14                                 |  |           |   |  |                                    
|Leadtek Research, Inc.                                                                                   |  | 99,875             |   |      | 4.74                                 |  |           |   |  |                                    
|King Yuan Electronics Co., Ltd.                                                                          |  | 366,101            |   |      | 3.33                                 |  |           |   |  |                                    
|Linden Technologies, Inc. (Note D)                                                                       |  | 92,385             |   |      |                                     |  |           |   |  |                                    
|Chip Express Corporation (Note D)                                                                        |  | 68,198             |   |      |                                     |  |           |   |  |                                    
|Primarion, Inc. (Note D)                                                                                 |  | 38,816             |   |      |                                     |  |           |   |  |                                    
|Broadcom Corporation (Note D)                                                                            |  | 7,093              |   |      |                                     |  |           |   |  |                                    
|SandCraft, Inc. (Note D)                                                                                 |  | 4,832              |   |      |                                     |  |           |   |  |                                    
|Triscend Corp. (Note D)                                                                                  |  | 4,600              |   |      |                                     |  |           |   |  |                                    
|Netlogic Microsystems, Inc. (Note D)                                                                     |  | 3,195              |   |      |                                     |  |           |   |  |                                    
|                                                                                                         |  |                    |   |      |                                      |  |            |   |  |                                     
|Subtotal                                                                                                 |  | 16,964,768         |   |      |                                      |  | 11,538,899 |   |  |                                     
|                                                                                                         |  |                    |   |      |                                      |  |            |   |  |                                     
|Prepaid long-term investments :                                                                          |  |                    |   |      |                                      |  |            |   |  |                                     
|Chip Advanced Technology                                                                                 |  |                   |   |      |                                      |  | 16,630     |   |  |                                     
|EE Solutions                                                                                             |  | 52,343             |   |      |                                      |  |           |   |  |                                     
|                                                                                                         |  |                    |   |      |                                      |  |            |   |  |                                     
|Subtotal                                                                                                 |  | 52,343             |   |      |                                      |  | 16,630     |   |  |                                     
|                                                                                                         |  |                    |   |      |                                      |  |            |   |  |                                     
|Less: Allowance for loss on decline in market value                                                      |  | (62,888            | ) |      |                                      |  | (238,367   | ) |  |                                     
|                                                                                                         |  |                    |   |      |                                      |  |            |   |  |                                     
|Total                                                                                                    |  | 38,859,249         |   |      |                                      |  | 32,712,278 |   |  |                                     
|                                                                                                         |  |                    |   |      |                                      |  |            |   |  |                                     



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



|        |  |                                                                                                                                                                                                                                                                                                                                                                     
|------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|        | 
|Note A: |  | The investments were accounted for under the equity method as the percentage of ownership directly and indirectly held was over 20% or significant influences were exercised by the
Group.                                                                                                                                                                          
|        | 
|Note B: |  | Among the shares held by the Company in AU Optronics Corp., approximately 337,455 thousand and 71,215 thousand shares with the book value of NT$4,772 million and NT$959 million as of December
31, 2003 and 2004, respectively, were utilized as reference shares for the Companys zero coupon exchangeable bonds.                                                
|        | 
|Note C: |  | During the first quarter of 2003, the Company acquired additional interests in Silicon Integrated Systems Corp., an investee previously accounted for under the lower of cost or market value
method. Percentage of voting rights held by the Company was the highest among shareholders and significant influences were exercised. Thus, equity method was applied.
|        | 
|Note D: |  | The amount represented the investments in preferred shares. As the Group did not possess voting rights and significant influences, thus cost method was applied.                                                                                                                                                                                                    
|        | 
|Note E: |  | The amounts represented investments in limited partnership without voting rights. As the Group was not able to exercise significant influences, the investments were accounted for under the cost
method.                                                                                                                                                           



| | (2) | Investment income accounted for under the equity method, which were based on the audited financial statements of the investees, were NT$231 million, NT$301 million and NT$552
million for the years ended December 31, 2002, 2003 and 2004, respectively.
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (3) | The long-term investments were not pledged.
| | --- | -------------------------------------------



11. Property, Plant and Equipment



|                                         |  |                         |  |                         |   |  |            
|---------------------------------------- |  | ----------------------- |  | ----------------------- | - |  | -----------
|                                         |  | As of December 31, 2003
|                                         |  | Cost                    |  | AccumulatedDepreciation |   |  | Book Value 
|                                         |  | NT$000                 |  | NT$000                 |   |  | NT$000    
|Land                                     |  | 1,560,237               |  |                        |   |  | 1,560,237  
|Buildings                                |  | 17,721,538              |  | (4,341,358              | ) |  | 13,380,180 
|Machinery and equipment                  |  | 272,927,438             |  | (162,407,026            | ) |  | 110,520,412
|Transportation equipment                 |  | 90,955                  |  | (46,809                 | ) |  | 44,146     
|Furniture and fixtures                   |  | 2,521,756               |  | (1,339,705              | ) |  | 1,182,051  
|Leased assets                            |  | 47,783                  |  | (31,855                 | ) |  | 15,928     
|Leasehold improvements                   |  | 40,848                  |  | (34,162                 | ) |  | 6,686      
|Construction in progress and prepayments |  | 22,846,921              |  |                        |   |  | 22,846,921 
|                                         |  |                         |  |                         |   |  |            
|Total                                    |  | 317,757,476             |  | (168,200,915            | ) |  | 149,556,561
|                                         |  |                         |  |                         |   |  |            



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



|                                         |  |                         |  |                         |   |  |            
|---------------------------------------- |  | ----------------------- |  | ----------------------- | - |  | -----------
|                                         |  | As of December 31, 2004
|                                         |  | Cost                    |  | AccumulatedDepreciation |   |  | Book Value 
|                                         |  | NT$000                 |  | NT$000                 |   |  | NT$000    
|Land                                     |  | 1,320,095               |  |                        |   |  | 1,320,095  
|Buildings                                |  | 21,237,012              |  | (5,347,449              | ) |  | 15,889,563 
|Machinery and equipment                  |  | 358,364,726             |  | (216,336,818            | ) |  | 142,027,908
|Transportation equipment                 |  | 89,252                  |  | (55,385                 | ) |  | 33,867     
|Furniture and fixtures                   |  | 2,638,541               |  | (1,631,683              | ) |  | 1,006,858  
|Leased assets                            |  | 47,783                  |  | (47,783                 | ) |  |           
|Leasehold improvements                   |  | 38,620                  |  | (37,912                 | ) |  | 708        
|Construction in progress and prepayments |  | 31,745,156              |  |                        |   |  | 31,745,156 
|                                         |  |                         |  |                         |   |  |            
|Total                                    |  | 415,481,185             |  | (223,457,030            | ) |  | 192,024,155
|                                         |  |                         |  |                         |   |  |            



| | (1) | Total interest expense before capitalization amounted to NT$2,006 million, NT$1,789 million and NT$1,788 million for the years ended December 31, 2002, 2003 and 2004, respectively.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Details of capitalized interest are as follows:



|                                    |  |                                 |   |  |            |   |  |            |  
|----------------------------------- |  | ------------------------------- | - |  | ---------- | - |  | ---------- | -
|                                    |  | For the year ended December 31, |  
|                                    |  | 2002                            |   |  | 2003       |   |  | 2004       |  
|                                    |  | NT$000                         |   |  | NT$000    |   |  | NT$000    |  
|Machinery and equipment             |  | 545,551                         |   |  | 456,871    |   |  | 348,924    |  
|Other property, plant and equipment |  | 5,162                           |   |  | 5,795      |   |  | 3,956      |  
|                                    |  |                                 |   |  |            |   |  |            |  
|Total interest capitalized          |  | 550,713                         |   |  | 462,666    |   |  | 352,880    |  
|                                    |  |                                 |   |  |            |   |  |            |  
|Interest rates applied              |  | 3.34%~3.89                      | % |  | 1.55%~3.50 | % |  | 1.55%~3.55 | %
|                                    |  |                                 |   |  |            |   |  |            |  



| | (2) | The insurance coverage for property, plant and equipment amounted to NT$308,267 million and NT$419,144 million as of December 31, 2003 and 2004, respectively.
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (3) | Please refer to Note 26 for property, plant and equipment pledged as collateral.
| | --- | --------------------------------------------------------------------------------



F-25



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



12. Other assets - Others



|                    |  |                    |  |          
|------------------- |  | ------------------ |  | ---------
|                    |  | As of December 31,
|                    |  | 2003               |  | 2004     
|                    |  | NT$000            |  | NT$000  
|Leased assets       |  | 681,742            |  | 1,382,090
|Deposits-out        |  | 1,272,321          |  | 3,317,107
|Restricted deposits |  | 156,816            |  | 5,000    
|Others              |  | 283,112            |  | 212,112  
|                    |  |                    |  |          
|Total               |  | 2,393,991          |  | 4,916,309
|                    |  |                    |  |          



Please refer to Note
26 for restricted deposits pledged as collateral.



13. Short-term Loans



|                     |  |                    |   |  |            |  
|-------------------- |  | ------------------ | - |  | ---------- | -
|                     | 
|                     |  | As of December 31, |  
|                     |  | 2003               |   |  | 2004       |  
|                     |  | NT$000            |   |  | NT$000    |  
|Unsecured bank loans |  | 1,884,899          |   |  | 2,986,919  |  
|                     |  |                    |   |  |            |  
|Interest rates       |  | 1.60%~1.74         | % |  | 0.86%~2.89 | %
|                     |  |                    |   |  |            |  



The unused short-term
lines of credits amounted to NT$16,312 million and NT$8,129 million as of December 31, 2003 and 2004, respectively.



14. Bonds Payable



|                                 |  |                    |   |  |            |  
|-------------------------------- |  | ------------------ | - |  | ---------- | -
|                                 | 
|                                 |  | As of December 31, |  
|                                 |  | 2003               |   |  | 2004       |  
|                                 |  | NT$000            |   |  | NT$000    |  
|Secured domestic bonds payable   |  | 1,710,002          |   |  | 570,003    |  
|Unsecured domestic bonds payable |  | 40,000,000         |   |  | 32,750,000 |  
|Convertible bonds payable        |  | 18,057,869         |   |  | 9,391,140  |  
|Exchangeable bonds payable       |  | 14,804,484         |   |  | 3,107,029  |  
|Premiums on exchangeable bonds   |  | 187,360            |   |  |           |  
|Premiums on convertible bonds    |  | 33,151             |   |  | 20,592     |  
|Compensation interest payable    |  | 126,763            |   |  |           |  
|                                 |  |                    |   |  |            |  
|Subtotal                         |  | 74,919,629         |   |  | 45,838,764 |  
|Less: Current portion            |  | (16,705,716        | ) |  | (2,820,003 | )
|                                 |  |                    |   |  |            |  
|Net                              |  | 58,213,913         |   |  | 43,018,761 |  
|                                 |  |                    |   |  |            |  



F-26



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (1) | On April 27, 2000, the Company issued five-year secured bonds amounting to NT$3,990 million. The interest is paid semi-annually with stated interest rate of 5.6%. The bonds are
repayable in installments every six months from April 27, 2002 to April 27, 2005.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (2) | During the period from April 16 to April 27, 2001, the Company issued five-year and seven-year unsecured bonds totaling NT$15,000 million, each with face value of NT$7,500 million.
The interest is paid annually with stated interest rates of 5.1195% through 5.1850% and 5.2170% through 5.2850%, respectively. The five-year bonds and seven-year bonds are repayable starting from April 2004 to April 2006 and April 2006 to April
2008, respectively, both in three yearly installments at the rates of 30%, 30% and 40%.
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (3) | During the period from October 2 to October 15, 2001, the Company issued three-year and five-year unsecured bonds totaling NT$10,000 million, each with a face value of NT$5,000
million. The interest is paid annually with stated interest rates of 3.3912% through 3.420% and 3.4896% through 3.520%, respectively. The three-year bonds were repaid at 100% of its principal amount during the period from October 2 to October 15,
2004. The five-year bonds will be repayable in October 2006, upon the maturity of the bonds.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (4) | On December 12, 2001, the Company issued zero coupon convertible bonds amounting to US$302.4 million on the Luxembourg Stock Exchange (LSE). The terms and conditions of the bonds
are as follows:
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | Final Redemption
| | -- | ----------------



Unless previously redeemed, repurchased, cancelled or converted, the bonds can be redeemed at 101.675% of their principal amount on March 1, 2004.



| | b. | Redemption at the Option of the Company
| | -- | ---------------------------------------



The Company may redeem all, but not some only, of the bonds, subject to giving no less than 30 nor more than 60 days advance notice, at the early
redemption amount, provided that:



| | (a) | On or at any time after June 13, 2003, the closing price of the ADSs on the NYSE or other applicable securities exchange on which the ADSs are listed on any ADS trading day for 20
out of 30 consecutive ADS trading days ending at any time within the period of 5 ADS trading days prior to the date of the redemption notice shall have been at least 130% of the conversion price or last adjusted conversion price, as the case
may be, on each such day, or
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (b) | At any time prior to maturity at least 90% in principal amount of the bonds have already been redeemed, repurchased, cancelled or converted.
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------



F-27



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | c. | Conversion Period
| | -- | -----------------



| | (a) | In respect of the common shares, on or after January 22, 2002, and on or prior to February 20, 2004, or
| | --- | -------------------------------------------------------------------------------------------------------



| | (b) | In respect of the ADSs, on or after the later of January 22, 2002 and the date on which the shelf registration statement covering resales of certain ADSs issuable upon conversion of
the bonds has been declared effective by the U.S. Securities and Exchange Commission, on or prior to February 20, 2004.
| | --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | d. | Conversion Price
| | -- | ----------------



| | (a) | In respect of the common shares, will be NT$66.67 per share, and
| | --- | ----------------------------------------------------------------



| | (b) | In respect of the ADSs, will be US$9.673 per ADS.
| | --- | -------------------------------------------------



The applicable conversion price will be subject to adjustments upon the occurrence of certain events set out in the indenture.



| | e. | Reacquisition of the Bonds
| | -- | --------------------------



As of December 31, 2003, the Company had reacquired a total amount of US$62 million of the bonds from the open market. The corresponding loss on the
reacquisition amounting to NT$5 million for the year ended December 31, 2003 was recognized as other losses. As of December 31, 2004, the Company has reacquired a total amount of US$63 million of the bonds from the open market. The corresponding
loss on the reacquisition amounting to NT$0.06 million for the year ended December 31, 2004 was recognized as other losses.



| | f. | Redemption of the Bonds
| | -- | -----------------------



On February 27, 2004, the remaining balance of bonds was redeemed.



| | (5) | On May 10, 2002, the Company issued LSE listed zero coupon exchangeable bonds exchangeable for common shares or ADSs of AU Optronics Corp. (AUO) with an aggregate principal amount
of US$235 million. The terms and conditions of the bonds are as follows:
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | Final Redemption
| | -- | ----------------



Unless previously redeemed, exchanged or purchased and cancelled, the bonds must be redeemed at their principal amounts in US Dollars on May 10, 2007.



F-28



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | b. | Redemption at the Option of the Company
| | -- | ---------------------------------------



The Company may redeem the bonds, in whole or in part, in principal amount thereof, on or after August 10, 2002 and prior to May 10, 2007 at their
principal amount, if the closing price of the AUO common shares on the TSE, translated into US Dollars at the prevailing exchange rate, for a period of 20 consecutive trading days, the last of which occurs not more than 10 days prior to the date
upon which notice of such redemption is published, is at least 120% of the exchange price then in effect translated into US Dollars at the rate of NT$34.645=US$1.00.



The Company may also redeem the bonds, in whole, but not in part, if at least 90% in principal amount of the bonds has
already been exchanged, redeemed or purchased and cancelled.



| | c. | Redemption at the Option of Bondholders
| | -- | ---------------------------------------



The Company will, at the option of the holders, redeem such bonds on February 10, 2005 at their principal amount.



| | d. | Tax Redemption
| | -- | --------------



The Company may redeem all, but not part, of the bonds, at any time in the event of certain changes in the ROCs tax rules which would require the
Company to gross up for payments of principal, or to gross up for payments of interest or premium.



| | e. | Terms of Exchange
| | -- | -----------------



Subject to prior permitted redemption and as otherwise provided in the offering, the bonds are exchangeable at any time on or after June 19, 2002 and
prior to April 10, 2007, into AUO shares or AUO ADSs at an exchange price of NT$51.30 per share, determined on the basis of a fixed exchange rate of NT$34.645=US$1.00; provided however, that if the exercise date falls within 5 business days from the
beginning of, and during, any closed period, the right of the exchanging holder of the bonds to vote with respect to the shares it receives will be subject to certain restrictions.



The exchange price will be subject to adjustments upon the occurrence of certain events set out in the indenture.



| | f. | Exchange of the Bonds
| | -- | ---------------------



As of December 31, 2004, certain bondholders have exercised their rights to exchange their bonds with the total principal amount of US$137 million into
AUO shares. The corresponding gain on the exchange amounting to NT$3,457 million for the year ended December 31, 2004 was recognized as a gain on disposal of investments.



F-29



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (6) | During the period from May 21 to June 24, 2003, the Company issued five-year and seven-year unsecured bonds totaling NT$15,000 million, each with a face value of NT$7,500 million.
The interest is paid annually with stated interest rates of 4.0% minus USD 12-Month LIBOR and 4.3% minus USD 12-Month LIBOR, respectively. Stated interest rates are reset annually based on the prevailing USD 12-Month LIBOR. The five-year bonds and
seven-year bonds are repayable in 2008 and 2010, respectively, upon the maturity of the bonds.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (7) | On July 15, 2003, the Company issued its second LSE listed zero coupon exchangeable bonds exchangeable for common shares of AUO with an aggregate principal amount of US$206 million.
The issue price was set at 103.0% of the principal amount. The terms and conditions of the bonds are as follows:
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | Final Redemption
| | -- | ----------------



Unless previously redeemed, exchanged or purchased and cancelled, the bonds must be redeemed at their principal amount in US Dollars on July 15, 2008.



| | b. | Redemption at the Option of the Company
| | -- | ---------------------------------------



The Company may redeem the bonds, in whole or in part, in principal amount thereof, on or after January 15, 2004 and on or prior to July 15, 2005, at
their principal amount, plus a certain premium (the Early Redemption Amount) and thereafter until July 15, 2008 at their principal amount, if the closing price of the AUO common shares on the TSE, translated into US Dollars at the
prevailing exchange rate, for a period of 20 consecutive trading days, the last of which occurs not more than 10 days prior to the date upon which notice of such redemption is published, is at least 125% of the exchange price then in effect
translated into US Dollars at the rate of NT$34.390=US$1.00.



The Company may also redeem the bonds, in whole, but not in part, if at least 90% in principal amount of the bonds has already been exchanged, redeemed or purchased and cancelled.



| | c. | Redemption at the Option of Bondholders
| | -- | ---------------------------------------



The Company will, at the option of any bondholders, redeem such bond starting on July 15, 2005 at its principal amount.



| | d. | Tax Redemption
| | -- | --------------



The Company may redeem all, but not part, of the bonds, at any time, in the event of certain changes in the ROCs tax rules which would require the
Company to gross up for payments of principal, or to gross up for payments of interest or premium.



F-30



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | e. | Terms of Exchange
| | -- | -----------------



Subject to prior permitted redemption and as otherwise provided in the offering, the bonds are exchangeable at any time on or after August 14, 2003 and
prior to June 30, 2008, into AUO shares at an exchange price of NT$36.387 per share, determined on the basis of a fixed exchange rate of NT$34.390=US$1.00; provided however, that if the exercise date falls within 5 business days from the beginning
of, and during, any closed period, the right of the exchanging holder of the bonds to vote with respect to the shares it receives will be subject to certain restrictions.



The exchange price will be subject to adjustment upon the occurrence of certain events set out in the indenture.



| | f. | Exchange of the Bonds
| | -- | ---------------------



As of December 31, 2003, certain bondholders have exercised their rights to exchange their bonds with the total principal amount of US$6 million into AUO
shares. The corresponding gain on the exchange amounting of NT$123 million for the year ended December 31, 2003 was recognized as a gain on disposal of investments.



As of December 31, 2004, all bondholders have exercised their rights to exchange their bonds into AUO shares. The
corresponding gain on the exchange amounting to NT$4,349 million for the year ended December 31, 2004 was recognized as a gain on disposal of investments.



| | (8) | On March 25, 2002, the Companys subsidiary, UMCJ, issued LSE listed zero coupon convertible bonds with an aggregate principal amount of JPY17,000 million and the issue price
was set at 101.75% of the principal amount. The terms and conditions of the bonds are as follows:
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | Final Redemption
| | -- | ----------------



Unless previously converted, purchased and cancelled or redeemed, the bonds must be redeemed on March 26, 2007, at their principal amount.



| | b. | Redemption at the Option of UMCJ
| | -- | --------------------------------



| | (a) | On or at any time after March 25, 2005, UMCJ may redeem all, but not part, of the bonds if the closing price of the shares on the Japan OTC Market is at least 120% of the conversion
price then in effect for at least 20 out of 30 consecutive trading days ending on the trading day immediately prior to the date of the notice of redemption; or if the principal amount that has not been redeemed, repurchased and cancelled or
converted is equal to or less than 10% of original aggregate principal amount.
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (b) | In case of a corporate split or share exchange / share transfer, UMCJ may redeem all, but not part, of the bonds on or prior to the effective date of the transaction, provided that
UMCJ is not able to ensure that the bondholders have the right to receive shares which they would have received had the conversion rights been exercised prior to the transaction.
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (c) | If a change in who controls UMCJ occurs, bondholders will be able to require UMCJ to redeem their bonds on the date that is 85 days after the change of control occurs.
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | c. | Conversion Period
| | -- | -----------------



At any time on or after May 3, 2002, to and including March 19, 2007.



| | d. | Conversion Price
| | -- | ----------------



The conversion price was set at JPY 400,000 per share, subject to adjustments upon the occurrence of certain events set out in the indenture.



| | e. | Reacquisition of the Bonds
| | -- | --------------------------



As of December 31, 2003, UMCJ has reacquired and cancelled a total amount of JPY 7,650 million of the bonds from the open market. The corresponding gain
on the reacquisition amounting to JPY 505 million for the year ended December 31, 2003 was recognized as other income. As of December 31, 2004, UMCJ has reacquired and cancelled a total amount of JPY 8,370 million and JPY 7,650 million of the bonds
from the open market.



| | (9) | On November 25, 2003, the Companys subsidiary, UMCJ, issued its second LSE listed zero coupon convertible bonds with an aggregate principal amount of JPY 21,500 million and
the issue price was set at 101.25% of the principal amount. The terms and conditions of the bonds are as follows:
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | Final Redemption
| | -- | ----------------



Unless previously converted, purchased and cancelled or redeemed, the bonds must be redeemed on November 25, 2013 at their principal amount.



| | b. | Redemption at the Option of UMCJ
| | -- | --------------------------------



| | (a) | On or at any time after November 27, 2006, UMCJ may redeem all, but not part, of the bonds if the closing price of the shares on the Japan OTC Market is at least 120% of the
conversion price then in effect for at least 20 out of 30 consecutive trading days ending on the trading day immediately prior to the date of the notice of redemption; or if the principal amount that has been redeemed, repurchased and cancelled or
converted is equal to or less than 10% of original aggregate principal amount.
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (b) | In case of a corporate split or share exchange / share transfer, UMCJ may redeem all, but not part, of the bonds on or prior to the effective date of the transaction, provided that
UMCJ is not able to ensure that the bondholders have the right to receive shares which they would have received had the conversion rights been exercised prior to the transaction.
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (c) | If a change in who controls UMCJ occurs, the bondholders will be able to require UMCJ to redeem their bonds on the date that is 70 days after the change of control occurs.
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | c. | Conversion Period
| | -- | -----------------



At any time on or after January 5, 2004, and on or prior to November 11, 2013.



| | d. | Conversion Price
| | -- | ----------------



The conversion price was set at JPY 187,500 per share, subject to adjustment upon the occurrence of certain events set out in the indenture.



| | (10) | Repayments of the above bonds in the future years are as follows:
| | ---- | -----------------------------------------------------------------



(assuming the convertible bonds and exchangeable bonds are both paid off upon maturity)



|                    |  |           
|------------------- |  | ----------
|Bonds repayable in  |  | Amount    
|                    |  | NT$000   
|2005                |  | 2,820,003 
|2006                |  | 10,250,000
|2007                |  | 8,059,519 
|2008                |  | 10,500,000
|2009 and thereafter |  | 14,188,650
|                    |  |           
|Total               |  | 45,818,172
|                    |  |           



15. Long-term Loans



|                          |  |                    |   |  |            |  
|------------------------- |  | ------------------ | - |  | ---------- | -
|                          |  | As of December 31, |  
|                          |  | 2003               |   |  | 2004       |  
|                          |  | NT$000            |   |  | NT$000    |  
|Secured long-term loans   |  | 2,739,269          |   |  | 19,044,000 |  
|Unsecured long-term loans |  | 3,598,875          |   |  | 4,666,500  |  
|                          |  |                    |   |  |            |  
|Total                     |  | 6,338,144          |   |  | 23,710,500 |  
|Less: Current portion     |  | (4,217,611         | ) |  | (5,441,143 | )
|                          |  |                    |   |  |            |  
|Net                       |  | 2,120,533          |   |  | 18,269,357 |  
|                          |  |                    |   |  |            |  
|Interest rates            |  | 0.95%~2.53         | % |  | 0.81~3.55  | %
|                          |  |                    |   |  |            |  



F-33



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (1) | The above long-term loans will be repaid by installments with the last payment on March 25, 2008. Repayments in the coming years respectively are as follows:
| | --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------



|                             |  |           
|---------------------------- |  | ----------
|Long-term loans repayable in |  | Amount    
|                             |  | NT$000   
|2005                         |  | 5,441,143 
|2006                         |  | 7,774,393 
|2007                         |  | 7,774,393 
|2008                         |  | 2,720,571 
|                             |  |           
|Total                        |  | 23,710,500
|                             |  |           



| | (2) | The long-term loans denominated in US Dollars amounted to US$48 million and US$600 million as of December 31, 2003 and 2004, respectively. The long-term loans denominated in
Japanese Yen amounted to JPY 11,250 million and JPY 15,000 million as of December 31, 2003 and 2004, respectively.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (3) | Assets pledged as collateral to secure these loans are detailed in Note 26.
| | --- | ---------------------------------------------------------------------------



16. Pension Fund



| | (1) | Change in benefit obligation during the year:
| | --- | ---------------------------------------------



|                                                  |  |                                 |   |  |            |  
|------------------------------------------------- |  | ------------------------------- | - |  | ---------- | -
|                                                  |  | For the year ended December 31, |  
|                                                  |  | 2003                            |   |  | 2004       |  
|                                                  |  | NT$000                         |   |  | NT$000    |  
|Projected benefit obligation at beginning of year |  | (3,287,327                      | ) |  | (3,725,630 | )
|Service cost                                      |  | (482,185                        | ) |  | (471,937   | )
|Interest cost                                     |  | (123,168                        | ) |  | (123,181   | )
|Benefits paid                                     |  | 15,720                          |   |  | 36,894     |  
|Gain (loss) on projected benefit obligation       |  | 151,330                         |   |  | (70,507    | )
|                                                  |  |                                 |   |  |            |  
|Projected benefit obligation at end of year       |  | (3,725,630                      | ) |  | (4,354,361 | )
|                                                  |  |                                 |   |  |            |  



| | (2) | Change in pension assets during the year:
| | --- | -----------------------------------------



|                                               |  |                                 |   |  |           |  
|---------------------------------------------- |  | ------------------------------- | - |  | --------- | -
|                                               |  | For the year ended December 31, |  
|                                               |  | 2003                            |   |  | 2004      |  
|                                               |  | NT$000                         |   |  | NT$000   |  
|Fair value of plan assets at beginning of year |  | 991,058                         |   |  | 1,196,723 |  
|Actual return on plan assets                   |  | 33,312                          |   |  | 35,728    |  
|Contributions from employer                    |  | 193,311                         |   |  | 193,711   |  
|Benefits paid                                  |  | (15,720                         | ) |  | (36,894   | )
|Transferred in from merger with SiSMC          |  |                                |   |  | 3,703     |  
|Others                                         |  | (5,238                          | ) |  | 11,159    |  
|                                               |  |                                 |   |  |           |  
|Fair value of plan assets at end of year       |  | 1,196,723                       |   |  | 1,404,130 |  
|                                               |  |                                 |   |  |           |  



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (3) | The funding status of the pension plan is as follows:
| | --- | -----------------------------------------------------



|                                                            |  |                    |   |  |            |  
|----------------------------------------------------------- |  | ------------------ | - |  | ---------- | -
|                                                            |  | As of December 31, |  
|                                                            |  | 2003               |   |  | 2004       |  
|                                                            |  | NT$000            |   |  | NT$000    |  
|Benefit obligation                                          |  |                    |   |  |            |  
|Vested benefit obligation                                   |  | (424,662           | ) |  | (455,706   | )
|Non-vested benefit obligation                               |  | (1,210,526         | ) |  | (1,378,172 | )
|                                                            |  |                    |   |  |            |  
|Accumulated benefit obligation                              |  | (1,635,188         | ) |  | (1,833,878 | )
|Effect from projected salary increase                       |  | (2,090,442         | ) |  | (2,520,483 | )
|                                                            |  |                    |   |  |            |  
|Projected benefit obligation                                |  | (3,725,630         | ) |  | (4,354,361 | )
|Fair value of plan assets                                   |  | 1,196,723          |   |  | 1,404,130  |  
|                                                            |  |                    |   |  |            |  
|Funded status                                               |  | (2,528,907         | ) |  | (2,950,231 | )
|Unrecognized net transitional benefit obligation            |  | 261,627            |   |  | 219,572    |  
|Unrecognized loss                                           |  | 16,244             |   |  | 28,956     |  
|Adjustment required to recognize minimum liabilities        |  | (41,852            | ) |  | (11,705    | )
|                                                            |  |                    |   |  |            |  
|Accrued pension liabilities per actuarial report            |  | (2,292,888         | ) |  | (2,713,408 | )
|Over accrual                                                |  | (17,004            | ) |  |           |  
|                                                            |  |                    |   |  |            |  
|Accrued pension liabilities recognized in the balance sheet |  | (2,309,892         | ) |  | (2,713,408 | )
|                                                            |  |                    |   |  |            |  



| | (4) | The components of net periodic pension cost are as follows:
| | --- | -----------------------------------------------------------



|                                                                 |  |                                 |   |  |         |   |  |         |  
|---------------------------------------------------------------- |  | ------------------------------- | - |  | ------- | - |  | ------- | -
|                                                                 |  | For the year ended December 31, |  
|                                                                 |  | 2002                            |   |  | 2003    |   |  | 2004    |  
|                                                                 |  | NT$000                         |   |  | NT$000 |   |  | NT$000 |  
|Service cost                                                     |  | 427,082                         |   |  | 482,185 |   |  | 471,937 |  
|Interest cost                                                    |  | 110,230                         |   |  | 123,168 |   |  | 123,181 |  
|Expected return on plan assets                                   |  | (30,258                         | ) |  | (26,727 | ) |  | (26,884 | )
|Amortization of unrecognized net transitional benefit obligation |  | 39,537                          |   |  | 45,927  |   |  | 45,444  |  
|Amortization of unrecognized pension loss                        |  | 6,129                           |   |  | 13,784  |   |  | 13,279  |  
|Transferred in from merger with SiSMC                            |  |                                |   |  |        |   |  | 8,844   |  
|                                                                 |  |                                 |   |  |         |   |  |         |  
|Net periodic pension cost                                        |  | 552,720                         |   |  | 638,337 |   |  | 635,801 |  
|                                                                 |  |                                 |   |  |         |   |  |         |  



The actuarial
assumptions underlying are as follows:



|                               |  |                                 |  |       |  |       |  |             |  |       |  |       |  |             |  |       |  |      
|------------------------------ |  | ------------------------------- |  | ----- |  | ----- |  | ----------- |  | ----- |  | ----- |  | ----------- |  | ----- |  | -----
|                               |  | For the year ended December 31,
|                               |  | 2002                            |  | 2003  |  | 2004 
|                               |  | The Company                     |  | UMO   |  | UMCJ  |  | The Company |  | UMO   |  | UMCJ  |  | The Company |  | UMO   |  | UMCJ 
|Discount rate                  |  | 4.00%                           |  | 4.00% |  | 2.00% |  | 3.50%       |  | 3.50% |  | 2.00% |  | 3.50%       |  | 3.75% |  | 2.00%
|Rate of salary increase        |  | 5.50%                           |  | 6.00% |  | 3.71% |  | 5.00%       |  | 5.00% |  | 3.71% |  | 5.00%       |  | 4.00% |  | 3.71%
|Expected return on plan assets |  | 3.25%                           |  | 3.25% |  | 1.00% |  | 2.75%       |  | 2.75% |  | 1.00% |  | 3.50%       |  | 2.75% |  | 1.00%



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



17. Capital Stock



| | (1) | As recommended by the board of directors and approved by the shareholders meeting on June 9, 2003, the Company issued 665,898 thousand new shares from the capitalization of
retained earnings, of which NT$6,079 million were stock dividends and NT$580 million were employees bonus.
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (2) | As of December 31, 2003, 22,000,000 thousand common shares were authorized to be issued and 16,140,744 thousand common shares were issued, each at a par value of NT$10.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (3) | Based on the resolution of the board of directors meeting on February 26, 2004, the Company merged with SiSMC on July 1, 2004, the effective date, through the issuance of
357,143 thousand new shares at a par value of NT$10 each. 2.24 shares of SiSMC were exchanged to 1 share of the Company, the surviving company.
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (4) | As recommended by the board of directors and amended by the shareholders meeting on June 1, 2004, the Company issued 1,399,685 thousand new shares from the capitalization of
retained earnings that amounted to NT$13,335 million and capital reserve that amounted to NT$661 million, of which NT$12,224 million were stock dividends and NT$1,111 million were employees bonus.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (5) | On July 22, 2004, the Company wrote off 149,728 thousand shares of treasury stock, which were bought back during the period from August 1 to September 28, 2001, and the period from
August 14 to September 25, 2002, for conversion of the convertible bonds.
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (6) | The employee stock options issued by the Company on October 7, 2002, were exercised into 44,138 thousand shares during 2004. The effective date of issuance of new shares was
December 28, 2004.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (7) | As of December 31, 2004, 22,000,000 thousand common shares were authorized to be issued and 17,791,982 thousand common shares were issued, each at a par value of NT$10.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (8) | The Company has issued a total of 231,497 thousand ADSs which were traded on the NYSE as of December 31, 2004. The total number of common shares represented by all issued ADSs is
1,157,486 thousand shares (One ADS represents five common shares).
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



18. Employee Stock Options



On September 11, 2002, October 8, 2003, and September 30, 2004, the Company was authorized by the relevant government authorities to issue Employee
Stock Options with a total number of 1 billion, 150 million, and 150 million units, respectively. Each unit entitles an optionee to subscribe to 1 share of the Companys common stock. Settlement upon the exercise of the options will be made
through the issuance of new shares by the Company. The exercise price of options was set at the closing price of the Companys common stock on the date of grant. The grant period for the options is 6 years and an optionee may exercise the
options in accordance with certain schedules as prescribed by the plan starting 2 years from the date of grant. Detailed information relevant to the Employee Stock Options is disclosed as follows:



|                  |  |                                                |  |                                                    |  |                     
|----------------- |  | ---------------------------------------------- |  | -------------------------------------------------- |  | --------------------
|Date of grant     |  | Total number of options granted (in thousands) |  | Total number of options outstanding (in thousands) |  | Exercise price (NT$)
|October 7, 2002   |  | 939,000                                        |  | 773,498                                            |  | 17.7                
|January 3, 2003   |  | 61,000                                         |  | 50,920                                             |  | 19.9                
|November 26, 2003 |  | 57,330                                         |  | 50,810                                             |  | 27.8                
|March 23, 2004    |  | 33,330                                         |  | 28,570                                             |  | 25.7                
|July 1, 2004      |  | 56,590                                         |  | 51,140                                             |  | 23.2                
|October 13, 2004  |  | 20,200                                         |  | 18,920                                             |  | 20.0                



| | (1) | A summary of the Companys stock option plans, and related information for the years ended December 31, 2003 and 2004 are as follows:
| | --- | -------------------------------------------------------------------------------------------------------------------------------------



|                                                               |  |                                 |   |      |                                 |  |                       |   |  |                                
|-------------------------------------------------------------- |  | ------------------------------- | - | ---- | ------------------------------- |  | --------------------- | - |  | -------------------------------
|                                                               |  | For the year ended December 31,
|                                                               |  | 2003                            |   | 2004
|                                                               |  | Option (in thousands)           |   |      | Weighted-average Exercise Price |  | Option (in thousands) |   |  | Weighted-average Exercise Price
|                                                               |  |                                 |   |      | NT$                             |  |                       |   |  | NT$                            
|Outstanding at beginning of year                               |  | 928,059                         |   |      | 17.7                            |  | 980,664               |   |  | 18.4                           
|Granted                                                        |  | 118,330                         |   |      | 23.7                            |  | 110,120               |   |  | 23.4                           
|Exercised                                                      |  |                                |   |      |                                |  | (44,138               | ) |  | 17.7                           
|Forfeited                                                      |  | (65,725                         | ) |      | 18.4                            |  | (72,788               | ) |  | 19.3                           
|                                                               |  |                                 |   |      |                                 |  |                       |   |  |                                
|Outstanding at end of year                                     |  | 980,664                         |   |      | 18.4                            |  | 973,858               |   |  | 18.9                           
|                                                               |  |                                 |   |      |                                 |  |                       |   |  |                                
|Exercisable at end of year                                     |  |                                |   |      |                                 |  | 368,896               |   |  |                                
|                                                               |  |                                 |   |      |                                 |  |                       |   |  |                                
|Weighted-average fair value of options granted during the year |  | NT$3.0                          |   |      |                                 |  | NT$3.8                |   |  |                                



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (2) | The information of the Companys outstanding stock options as of December 31, 2004, is as follows:
| | --- | --------------------------------------------------------------------------------------------------



|                   |  |                        |  |                           |  |                                         |  |                                |  |                       |  |                               
|------------------ |  | ---------------------- |  | ------------------------- |  | --------------------------------------- |  | ------------------------------ |  | --------------------- |  | ------------------------------
|                   |  |                        |  | Outstanding Stock Options |  | Exercisable Stock Options              
|Authorization Date |  | Range ofExercise Price |  | Option (in thousands)     |  | Weighted-averageExpectedRemaining Years |  | Weighted-averageExercise Price |  | Option (in thousands) |  | Weighted-averageExercise Price
|                   |  | NT$                    |  |                           |  |                                         |  | NT$                            |  |                       |  | NT$                           
|91.09.11           |  | 17.7~19.9              |  | 824,418                   |  | 2.1                                     |  | 17.8                           |  | 368,896               |  | 17.7                          
|92.10.08           |  | 23.2~27.8              |  | 130,520                   |  | 3.6                                     |  | 25.5                           |  |                      |  |                              
|93.09.30           |  | 20.0                   |  | 18,920                    |  | 4.2                                     |  | 20.0                           |  |                      |  |                              
|                   |  |                        |  |                           |  |                                         |  |                                |  |                       |  |                               
|                   |  |                        |  | 973,858                   |  | 2.4                                     |  | 18.9                           |  | 368,896               |  | 17.7                          
|                   |  |                        |  |                           |  |                                         |  |                                |  |                       |  |                               



| | (3) | The Company has used the intrinsic value method to recognize compensation costs for its employee stock options issued since January 1, 2004. The compensation cost for the year ended
December 31, 2004, is NT$0. Pro forma information using the fair value method on net income and earnings per share is as follows:
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|                                          |  |                                      |  |                           
|----------------------------------------- |  | ------------------------------------ |  | --------------------------
|                                          |  | For the year ended December 31, 2004
|                                          |  | Basic earnings per share             |  | Diluted earnings per share
|                                          |  | NT$000                              |  | NT$000                   
|Net Income                                |  | 31,843,381                           |  | 31,873,101                
|Earnings per share (in dollars)           |  | 1.89                                 |  | 1.86                      
|Pro forma net income                      |  | 31,761,407                           |  | 31,791,127                
|Pro forma earnings per share (in dollars) |  | 1.89                                 |  | 1.86                      



The fair value of the
options granted after January 1, 2004, was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions for the year ended December 31, 2004: expected dividend yields of 11.40%;
volatility factors of the expected market price of the Companys common stock of 0.49%, 0.49%, and 0.48%, respectively; risk-free interest rate of 2.70%, 2.85%, and 2.70%, respectively; and a weighted-average expected life of the option of 4.4
years.



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



19. Treasury Stock



| | (1) | The Company bought back its own shares from the open market during the years ended December 31, 2002, 2003 and 2004. Details of the treasury stock transactions are as follows:
| | --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



For the year ended December
31, 2002



(In thousands of shares)



|                                                    |  |                     |  |          |  |          |  |                      
|--------------------------------------------------- |  | ------------------- |  | -------- |  | -------- |  | ---------------------
|Purpose                                             |  | As ofJanuary 1,2002 |  | Increase |  | Decrease |  | As ofDecember 31,2002
|For transfer to employees                           |  | 37,425              |  | 49,114   |  |         |  | 86,539               
|For conversion of the convertible bonds into shares |  | 129,035             |  | 20,693   |  |         |  | 149,728              
|                                                    |  |                     |  |          |  |          |  |                      
|Total shares                                        |  | 166,460             |  | 69,807   |  |         |  | 236,267              
|                                                    |  |                     |  |          |  |          |  |                      



For
the year ended December 31, 2003



(In
thousands of shares)



|                                                    |  |                     |  |          |  |          |  |                      
|--------------------------------------------------- |  | ------------------- |  | -------- |  | -------- |  | ---------------------
|Purpose                                             |  | As ofJanuary 1,2003 |  | Increase |  | Decrease |  | As ofDecember 31,2003
|For transfer to employees                           |  | 86,539              |  | 99,195   |  | 136,620  |  | 49,114               
|For conversion of the convertible bonds into shares |  | 149,728             |  |         |  |         |  | 149,728              
|                                                    |  |                     |  |          |  |          |  |                      
|Total shares                                        |  | 236,267             |  | 99,195   |  | 136,620  |  | 198,842              
|                                                    |  |                     |  |          |  |          |  |                      



For
the year ended December 31, 2004



(In
thousands of shares)



|                                                    |  |                     |  |          |  |          |  |                      
|--------------------------------------------------- |  | ------------------- |  | -------- |  | -------- |  | ---------------------
|Purpose                                             |  | As ofJanuary 1,2004 |  | Increase |  | Decrease |  | As ofDecember 31,2004
|For transfer to employees                           |  | 49,114              |  | 192,067  |  |         |  | 241,181              
|For conversion of the convertible bonds into shares |  | 149,728             |  |         |  | 149,728  |  |                     
|                                                    |  |                     |  |          |  |          |  |                      
|Total shares                                        |  | 198,842             |  | 192,067  |  | 149,728  |  | 241,181              
|                                                    |  |                     |  |          |  |          |  |                      



| | (2) | On July 22, 2004, the Company wrote off 149,728 thousand shares of treasury stock, amounting to NT$4,923 million, which were bought back for conversion of the convertible bonds into
shares from August 1 to September 28, 2001, and from August 14 to September 25, 2002.
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (3) | According to the Securities and Exchange Law of the ROC, total shares of treasury stock shall not exceed 10% of the Companys stock issued. Total purchase amount shall not
exceed the sum of the retained earnings, capital reserve-premiums, and realized capital reserve. As such, the maximum number of shares of treasury stock that the Company could hold as of December 31, 2003 and 2004 was 1,614,074 thousand shares and
1,779,198 thousand shares while the ceiling of the amount was NT$67,177 million and NT$89,425 million, respectively. As of December 31, 2003 and 2004, the Company held 198,842 thousand shares and 241,181 thousand shares of treasury stock, which
amounted to NT$7,101 million and NT$7,376 million, respectively.
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (4) | Treasury stock shall not be pledged, nor does it entitle voting rights or receive dividends, in compliance with Securities and Exchange Law of the ROC.
| | --- | -------------------------------------------------------------------------------------------------------------------------------------------------------



| | (5) | As of December 31, 2003, the Companys subsidiaries, Hsun Chieh and Fortune, held 503,456 thousand shares and 18,340 thousand shares of the Companys stock, with a book
value of NT$29.32 and NT$9.37 per share, respectively. The average closing price during December 2003 was NT$29.32.
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



As of December 31, 2004, the Companys subsidiaries, Hsun Chieh and Fortune, held 543,732 thousand shares and 19,808 thousand shares of the
Companys stock, with a book value of NT$20.08 and NT$8.68 per share, respectively. The average closing price during December 2004 was NT$20.08.



20. Retained Earnings and Dividend Policies



According to the Companys Articles of Incorporation, current years earnings, if any, shall be distributed in the following order:



| | (1) | Payment of all taxes and dues;
| | --- | ------------------------------



| | (2) | Offset prior years operation losses;
| | --- | -------------------------------------



| | (3) | Set aside 10% of the remaining amount after deducting items (1) and (2) as a legal reserve;
| | --- | -------------------------------------------------------------------------------------------



| | (4) | Set aside 0.1% of the remaining amount after deducting items (1), (2) and (3) as directors and supervisors remuneration; and
| | --- | ------------------------------------------------------------------------------------------------------------------------------



| | (5) | After deducting items (1), (2) and (3) above from the current years earnings, no less than 5% of the remaining amount together with the prior years unappropriated
earnings is to be allocated as employees bonus which will be settled through issuance of new Company shares. Employees of the Companys subsidiaries, meeting certain requirements determined by the board of directors, are also eligible for
the employees bonus.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (6) | The distribution of the remaining portion, if any, will be recommended by the board of directors and approved through the shareholders meeting.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



The Company is currently in its growth stage; the policy for dividend distribution should reflect
factors such as the current and future investment environment, fund requirements, domestic and international competition and capital budgets; as well as the benefit of shareholders, share bonus equilibrium, and long-term financial planning. The
board of directors shall make the distribution proposal annually and present it at the shareholders meeting. The Companys Articles of Incorporation further provide that at least 50% of the dividends to shareholders, if any, must be paid
in the form of stock dividends. Accordingly, no more than 50% of the dividends can be paid in the form of cash.



The appropriation of 2004 retained earnings has not yet been recommended by the board of directors as of the date of the Report of Independent Auditors.
Information on the board of directors recommendations and shareholders approval can be obtained from the Market Observation Post System on the website of the TSE.



Details of the 2003 employee bonus settlement and directors and supervisors remuneration are as follows:



|                                                                                                                                                     |  |                                        |           |                                        |   |             |  |  
|---------------------------------------------------------------------------------------------------------------------------------------------------- |  | -------------------------------------- | --------- | -------------------------------------- | - | ----------- |  | -
|                                                                                                                                                     |  | For the year ended December 31, 2003  
|                                                                                                                                                     |  | As approved bythe shareholdersmeeting |           | As recommendedby the board ofdirectors |   | Differences
|1.      Settlement of employees bonus by issuance of new shares                                                                                     |  |                                        |           |                                        |   |             |  |  
|a.      Number of shares (in thousands)                                                                                                              |  |                                        | 111,127   |                                        |   | 111,127     |  | 
|b.      Amount                                                                                                                                       |  | $                                      | 1,111,273 |                                        | $ | 1,111,273   |  | 
|c.      Percentage on total number of outstanding shares at year end (%)                                                                             |  |                                        | 0.70      |                                        |   | 0.70        |  | 
|2.      Remuneration paid to directors and supervisors                                                                                               |  | $                                      | 12,618    |                                        | $ | 12,618      |  | 
|3.      Effect on earnings per share before retroactive adjustments                                                                                  |  |                                        |           |                                        |   |             |  |  
|a.      Basic and diluted earnings per share (NTD)                                                                                                   |  | $                                      | 0.92/0.90 |                                        | $ | 0.92/0.90   |  | 
|b.      Pro forma basic and diluted earnings per share taking into consideration employees bonus and
directors and supervisors remuneration (NTD) |  | $                                      | 0.84/0.83 |                                        | $ | 0.84/0.83   |  | 



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Pursuant to Article 41 of the Securities and Exchange Law of the ROC, a special reserve is set aside
from the current net income and prior unappropriated earnings for items that are accounted for as deductions to stockholders equity such as unrealized loss on long-term investments and cumulative translation adjustments. However, there are the
following exceptions for the Companys investees unrealized loss on long-term investments arising from the merger which was recognized by the Company in proportion to the Companys ownership percentage:



| | a. | According to the explanatory letter No. 101801 of the Securities and Futures Commission (SFC), if the Company recognizes the investees capital reserve - excess from the merger
in proportion to the ownership percentage-then the special reserve is exempted for the amount originated from the acquisition of the long-term investments.
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | b. | However, if the Company and its investees transfer a portion of the capital reserve to increase capital, a special reserve equal to the amount of the transfer shall be provided
according to the explanatory letter No.101801-1 of the SFC.
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | c. | In accordance with the explanatory letter No.170010 of the SFC applicable to listed companies, when the market value of the Companys stock held by its subsidiaries at year-end
is lower than the book value, a special reserve shall be provided for in the Companys accounts in proportion to its ownership percentage.
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



For the 2003 appropriations approved by the shareholders meeting on June 1, 2004, unrealized loss on long-term investments exempted from the
provision of special reserve pursuant to the above regulations amounted to NT$14,826 million.



21. Operating Costs and Expenses



The Groups personnel, depreciation, and amortization expenses are summarized as follows:



|                           |  |                                 |  |                   |  |            |  |                |  |                   |  |            |  |                |  |                   |  |           
|-------------------------- |  | ------------------------------- |  | ----------------- |  | ---------- |  | -------------- |  | ----------------- |  | ---------- |  | -------------- |  | ----------------- |  | ----------
|                           |  | For the year ended December 31,
|                           |  | 2002                            |  | 2003              |  | 2004      
|                           |  | Operatingcosts                  |  | Operatingexpenses |  | Total      |  | Operatingcosts |  | Operatingexpenses |  | Total      |  | Operatingcosts |  | Operatingexpenses |  | Total     
|                           |  | NT$000                         |  | NT$000           |  | NT$000    |  | NT$000        |  | NT$000           |  | NT$000    |  | NT$000        |  | NT$000           |  | NT$000   
|Personnel expenses         |  |                                 |  |                   |  |            |  |                |  |                   |  |            |  |                |  |                   |  |           
|Salaries                   |  | 5,083,606                       |  | 2,122,316         |  | 7,205,922  |  | 6,135,769      |  | 2,453,842         |  | 8,589,611  |  | 8,761,122      |  | 3,390,638         |  | 12,151,760
|Labor and health insurance |  | 405,291                         |  | 145,184           |  | 550,475    |  | 459,361        |  | 147,940           |  | 607,301    |  | 525,172        |  | 156,691           |  | 681,863   
|Pension                    |  | 463,178                         |  | 146,772           |  | 609,950    |  | 337,911        |  | 166,287           |  | 504,198    |  | 507,357        |  | 182,194           |  | 689,551   
|Other personnel expenses   |  | 201,463                         |  | 200,325           |  | 401,788    |  | 36,791         |  | 411,968           |  | 448,759    |  | 154,281        |  | 119,520           |  | 273,801   
|Depreciation               |  | 34,895,683                      |  | 1,671,852         |  | 36,567,535 |  | 37,390,728     |  | 1,842,751         |  | 39,233,479 |  | 43,435,482     |  | 2,142,602         |  | 45,578,084
|Amortization               |  | 326,379                         |  | 1,164,565         |  | 1,490,944  |  | 172,533        |  | 1,292,831         |  | 1,465,364  |  | 782,440        |  | 1,386,967         |  | 2,169,407 



The numbers of
employees as of December 31, 2002, 2003 and 2004 were 10,167, 10,576 and 12,531, respectively.



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



22. Income Tax



| | (1) | Reconciliation between the income tax expense and the income tax calculated on pre-tax financial statement income based on the statutory tax rate is as follows:
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------



|                                                                 |  |                                 |   |  |            |   |  |            |  
|---------------------------------------------------------------- |  | ------------------------------- | - |  | ---------- | - |  | ---------- | -
|                                                                 |  | For the year ended December 31, |  
|                                                                 |  | 2002                            |   |  | 2003       |   |  | 2004       |  
|                                                                 |  | NT$000                         |   |  | NT$000    |   |  | NT$000    |  
|Income tax on pre-tax income at statutory tax rate               |  | 1,830,019                       |   |  | 3,467,870  |   |  | 7,472,675  |  
|Permanent differences                                            |  |                                 |   |  |            |   |  |            |  
|Investment loss                                                  |  | 55,445                          |   |  | 114,282    |   |  | 635,045    |  
|Gain on disposal of investments                                  |  | (1,602,035                      | ) |  | (1,668,153 | ) |  | (3,087,700 | )
|Loss carry-forward                                               |  | (344,763                        | ) |  |           |   |  | 62,881     |  
|Other permanent differences                                      |  | 1,157,097                       |   |  | (550,046   | ) |  | (2,824,334 | )
|                                                                 |  |                                 |   |  |            |   |  |            |  
|Subtotal                                                         |  | (734,256                        | ) |  | (2,103,917 | ) |  | (5,214,108 | )
|Change in investment tax credit                                  |  | (3,999,022                      | ) |  | 545,636    |   |  | (4,382,861 | )
|Change in valuation allowance against deferred income tax assets |  |                                 |   |  |            |   |  |            |  
|Investment tax credit                                            |  | 2,957,538                       |   |  | (877,820   | ) |  | (5,442     | )
|Loss carry-forward                                               |  | 119,769                         |   |  | (157,959   | ) |  | 2,464,282  |  
|                                                                 |  |                                 |   |  |            |   |  |            |  
|Subtotal                                                         |  | 3,077,307                       |   |  | (1,035,779 | ) |  | 2,458,840  |  
|Change in tax rate                                               |  |                                |   |  | 1,063      |   |  | 14,091     |  
|Estimated 10% income tax on unappropriated earnings              |  | 46,705                          |   |  | 126,794    |   |  | 29,419     |  
|Adjustment of prior years tax expense                           |  | 37,916                          |   |  | (28,547    | ) |  | 9,484      |  
|Income tax on interest revenue separately taxed                  |  | 12,062                          |   |  | 6,349      |   |  | (13,740    | )
|                                                                 |  |                                 |   |  |            |   |  |            |  
|Income tax expense                                               |  | 270,731                         |   |  | 979,469    |   |  | 373,800    |  
|                                                                 |  |                                 |   |  |            |   |  |            |  



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (2) | Significant components of deferred income tax assets and liabilities are as follows:
| | --- | ------------------------------------------------------------------------------------



|                                                  |  |                    |   |  |             |  
|------------------------------------------------- |  | ------------------ | - |  | ----------- | -
|                                                  |  | As of December 31, |  
|                                                  |  | 2003               |   |  | 2004        |  
|                                                  |  | NT$000            |   |  | NT$000     |  
|Deferred income tax assets                        |  |                    |   |  |             |  
|Investment tax credit                             |  | 20,195,499         |   |  | 22,271,168  |  
|Loss carry-forward                                |  | 4,161,872          |   |  | 4,583,963   |  
|Pension                                           |  | 540,886            |   |  | 661,805     |  
|Allowance on sales returns and discounts          |  | 92,395             |   |  | 268,715     |  
|Allowance for loss on obsolescence of inventories |  | 130,412            |   |  | 324,625     |  
|Compensation interest payable                     |  | 30,587             |   |  |            |  
|Organization cost                                 |  | 234                |   |  | 2           |  
|Others                                            |  | 614,866            |   |  | 814,924     |  
|                                                  |  |                    |   |  |             |  
|Total deferred income tax assets                  |  | 25,766,751         |   |  | 28,925,202  |  
|Valuation allowance                               |  | (13,034,410        | ) |  | (16,786,726 | )
|                                                  |  |                    |   |  |             |  
|Net deferred income tax assets                    |  | 12,732,341         |   |  | 12,138,476  |  
|                                                  |  |                    |   |  |             |  
|Deferred income tax liabilities                   |  |                    |   |  |             |  
|Unrealized exchange gain                          |  | (374,353           | ) |  | (249,734    | )
|Depreciation                                      |  | (4,893,245         | ) |  | (4,468,159  | )
|Others                                            |  | (26,362            | ) |  | (20,712     | )
|                                                  |  |                    |   |  |             |  
|Total deferred income tax liabilities             |  | (5,293,960         | ) |  | (4,738,605  | )
|                                                  |  |                    |   |  |             |  
|Total net deferred income tax assets              |  | 7,438,381          |   |  | 7,399,871   |  
|                                                  |  |                    |   |  |             |  
|Deferred income tax assets  current              |  | 9,242,541          |   |  | 9,923,193   |  
|Deferred income tax liabilities  current         |  | (374,353           | ) |  | (249,734    | )
|Valuation allowance                               |  | (5,914,810         | ) |  | (6,064,491  | )
|                                                  |  |                    |   |  |             |  
|Net                                               |  | 2,953,378          |   |  | 3,608,968   |  
|                                                  |  |                    |   |  |             |  
|Deferred income tax assets  noncurrent           |  | 16,524,210         |   |  | 19,002,009  |  
|Deferred income tax liabilities  noncurrent      |  | (4,919,607         | ) |  | (4,488,871  | )
|Valuation allowance                               |  | (7,119,600         | ) |  | (10,722,235 | )
|                                                  |  |                    |   |  |             |  
|Net                                               |  | 4,485,003          |   |  | 3,790,903   |  
|                                                  |  |                    |   |  |             |  
|Total net deferred income tax assets              |  | 7,438,381          |   |  | 7,399,871   |  
|                                                  |  |                    |   |  |             |  



| | (3) | The Companys income tax returns for all the fiscal years through 1999 and 2002 have been assessed and approved by the Tax Authority.
| | --- | -------------------------------------------------------------------------------------------------------------------------------------



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (4) | Pursuant to the Statute for the Establishment and Administration of Science Park of ROC, the Company was granted several four-year income tax exemption periods with
respect to income derived from the expansion of operations. The starting date of the exemption period attributable to the expansion in 2000 had not yet been decided by the Company. The income tax exemption for other periods will expire on December
31, 2009.
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (5) | The Group earns investment tax credits for the amount invested in production equipment, research and development, employee training, and investments in high technology industry and
venture capital.
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



As of December
31, 2004, the Groups unused investment tax credit was as follows:



|                |  |                               |  |                                         
|--------------- |  | ----------------------------- |  | ----------------------------------------
|Expiration year |  | Investment tax credits earned |  | Balance of unused investment tax credits
|                |  | NT$000                       |  | NT$000                                 
|2004            |  | 8,097,450                     |  | 3,714,589                               
|2005            |  | 5,338,222                     |  | 5,338,222                               
|2006            |  | 4,044,620                     |  | 4,044,620                               
|2007            |  | 1,536,606                     |  | 1,536,606                               
|2008            |  | 7,637,131                     |  | 7,637,131                               
|                |  |                               |  |                                         
|Total           |  | 26,654,029                    |  | 22,271,168                              
|                |  |                               |  |                                         



| | (6) | Under the rules of the Income Tax Law of the ROC, net loss can be carried forward for 5 years. As of December 31, 2004, the unutilized accumulated loss was as follows:
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------



|                |  |                  |  |                           
|--------------- |  | ---------------- |  | --------------------------
|Expiration year |  | Accumulated loss |  | Unutilizedaccumulated loss
|                |  | NT$000          |  | NT$000                   
|2006            |  | 11,437,788       |  | 11,437,788                
|2007            |  | 4,155,271        |  | 4,155,271                 
|2008            |  | 334,917          |  | 334,917                   
|2009            |  | 2,053,616        |  | 2,053,616                 
|                |  |                  |  |                           
|Total           |  | 17,981,592       |  | 17,981,592                
|                |  |                  |  |                           



| | (7) | The balance of the Companys imputation credit accounts as of December 31, 2003 and 2004 were NT$10.4 million and NT$0.4 million, respectively. The actual creditable ratio for
2002 and 2003 was 1.24% and 0.69%, respectively.
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (8) | The ending balances of unappropriated earnings as of December 31, 2003 and 2004 were as follows:
| | --- | ------------------------------------------------------------------------------------------------



|                         |  |                    |  |           
|------------------------ |  | ------------------ |  | ----------
|                         |  | As of December 31,
|                         |  | 2003               |  | 2004      
|                         |  | NT$000            |  | NT$000   
|Prior to January 1, 1998 |  | 64,220             |  |          
|After January 1, 1998    |  | 13,972,602         |  | 29,498,329
|                         |  |                    |  |           
|Total                    |  | 14,036,822         |  | 29,498,329
|                         |  |                    |  |           



23. Earnings per Share



| | (1) | The Company held zero coupon convertible bonds and employee stock options during 2004, and thus has a complex capital structure. The calculation of basic and diluted earnings per
share, for the years ended December 31, 2002, 2003 and 2004, was disclosed as follows:
| | --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|                                                                                |  |                                 |  |            |  |           
|------------------------------------------------------------------------------- |  | ------------------------------- |  | ---------- |  | ----------
|                                                                                |  | For the year ended December 31,
|                                                                                |  | 2002                            |  | 2003       |  | 2004      
|(shares expressed in thousands)                                                 |  | NT$000                         |  | NT$000    |  | NT$000   
|Net income                                                                      |  | 7,072,032                       |  | 14,020,257 |  | 31,843,381
|Effect of dilution:                                                             |  |                                 |  |            |  |           
|Employee stock options                                                          |  |                                |  |           |  |          
|Convertible bonds                                                               |  | 59,233                          |  | 50,954     |  | 29,720    
|                                                                                |  |                                 |  |            |  |           
|Adjusted net income assuming dilution                                           |  | 7,131,265                       |  | 14,071,211 |  | 31,873,101
|                                                                                |  |                                 |  |            |  |           
|Weighted average of shares outstanding                                          |  | 16,740,780                      |  | 16,644,032 |  | 16,828,205
|Effect of dilution:                                                             |  |                                 |  |            |  |           
|Employee stock options                                                          |  | 47,193                          |  | 228,762    |  | 245,983   
|Convertible bonds                                                               |  | 169,905                         |  | 152,565    |  | 20,660    
|                                                                                |  |                                 |  |            |  |           
|Adjusted weighted average of shares outstanding assuming dilution               |  | 16,957,878                      |  | 17,025,359 |  | 17,094,848
|                                                                                |  |                                 |  |            |  |           
|Retroactively adjusted weighted average of shares outstanding                   |  | 16,740,780                      |  | 16,644,032 |  |          
|                                                                                |  |                                 |  |            |  |           
|Retroactively adjusted weighted average of shares outstanding assuming dilution |  | 16,957,878                      |  | 17,025,359 |  |          
|                                                                                |  |                                 |  |            |  |           
|Earnings per share (in dollars) - basic Net income                              |  | 0.42                            |  | 0.84       |  | 1.89      
|                                                                                |  |                                 |  |            |  |           
|Earnings per share (in dollars) - diluted Net income                            |  | 0.42                            |  | 0.83       |  | 1.86      
|                                                                                |  |                                 |  |            |  |           



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (2) | Pro forma information on earnings per share as if the Companys unconsolidated subsidiary-Fortune Venture Capital Corporations investment in the Company is not treated as
treasury stock is set out as follows:
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|                                                                                    |  |         |            |   |         |   |            |  
|----------------------------------------------------------------------------------- |  | ------- | ---------- | - | ------- | - | ---------- | -
|                                                                                    |  | 2003    |           
|(shares expressed in thousands)                                                     |  | Basic   |            |   | Diluted |  
|                                                                                    |  | NT$000 |            |   | NT$000 |  
|Net income                                                                          |  |         | 14,020,257 |   |         |   | 14,071,211 |  
|                                                                                    |  |         |            |   |         |   |            |  
|Weighted average of shares outstanding:                                             |  |         |            |   |         |   |            |  
|Beginning balance                                                                   |  |         | 14,754,533 |   |         |   | 14,754,533 |  
|Stock dividends and employees bonus at 4.4% in 2003                                |  |         | 649,200    |   |         |   | 649,200    |  
|Stock dividends and employees bonus at 8.7% in 2004                                |  |         | 1,338,574  |   |         |   | 1,338,574  |  
|Purchase of 99,195 thousand shares of treasury stock in 2003                        |  |         | (87,216    | ) |         |   | (87,216    | )
|Treasury stock transferred to employees of 136,620 thousand shares in 2003          |  |         | 8,950      |   |         |   | 8,950      |  
|Dilutive shares of employee stock options accounted for under treasury stock method |  |         |           |   |         |   | 228,762    |  
|Dilutive shares issued assuming conversion of bonds                                 |  |         |           |   |         |   | 152,565    |  
|                                                                                    |  |         |            |   |         |   |            |  
|Ending balance                                                                      |  |         | 16,664,041 |   |         |   | 17,045,368 |  
|                                                                                    |  |         |            |   |         |   |            |  
|Earnings per share                                                                  |  |         |            |   |         |   |            |  
|Net income (in dollars)                                                             |  | $       | 0.84       |   |         | $ | 0.83       |  
|                                                                                    |  |         |            |   |         |   |            |  
|                                                                                    | 
|                                                                                    |  | 2004    |           
|                                                                                    |  | Basic   |            |   | Diluted |  
|(shares expressed in thousands)                                                     |  | NT$000 |            |   | NT$000 |  
|Net income                                                                          |  |         | 31,843,381 |   |         |   | 31,873,101 |  
|                                                                                    |  |         |            |   |         |   |            |  
|Weighted average of shares outstanding:                                             |  |         |            |   |         |   |            |  
|Beginning balance                                                                   |  |         | 15,438,446 |   |         |   | 15,438,446 |  
|Stock dividends and employees bonus at 8.7% in 2004                                |  |         | 1,341,591  |   |         |   | 1,341,591  |  
|Purchase of 192,067 thousand shares of treasury stock in 2004                       |  |         | (132,214   | ) |         |   | (132,214   | )
|Issuance of 357,143 thousand shares from merger with SiSMC                          |  |         | 195,150    |   |         |   | 195,150    |  
|Exercise of 44,138 thousand units of employees stock options                       |  |         | 5,166      |   |         |   | 5,166      |  
|Dilutive shares of employee stock options accounted for under treasury stock method |  |         |           |   |         |   | 245,983    |  
|Dilutive shares issued assuming conversion of bonds                                 |  |         |           |   |         |   | 20,660     |  
|                                                                                    |  |         |            |   |         |   |            |  
|Ending balance                                                                      |  |         | 16,848,139 |   |         |   | 17,114,782 |  
|                                                                                    |  |         |            |   |         |   |            |  
|Earnings per share                                                                  |  |         |            |   |         |   |            |  
|Net income (in dollars)                                                             |  | $       | 1.89       |   |         | $ | 1.86       |  
|                                                                                    |  |         |            |   |         |   |            |  



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



24. Merger



In order to integrate resources, reduce operating costs, enlarge business scales, and improve its financial structure, profitability and global
competitiveness, based on the resolution of the board of directors meeting on February 26, 2004, the Company merged with SiSMC, the dissolved company, on July 1, 2004. The merger was approved by the relevant government authorities. All the
assets, liabilities, rights and obligations of SiSMC have been fully incorporated into the Company since July 1, 2004. The accounting treatment regarding the merger is in compliance with the ROC SFAS No. 25 Enterprise Mergers-Accounting of
Purchase Method.



Relevant information required by ROC
SFAS No. 25 is disclosed as follows:



| | (1) | Information of the dissolved company:
| | --- | -------------------------------------



SiSMC was split from Silicon Integrated Systems Corp. on December 15, 2003. It was mainly engaged in manufacturing of integrated circuits and components
of semiconductors.



| | (2) | Effective date, percentage of acquisition and accounting treatment:
| | --- | -------------------------------------------------------------------



Based on the agreement and the resolution of the board of directors meeting, the effective date of the merger was July 1, 2004. All the stocks of
the dissolved company were exchanged by the surviving companys newly issued shares, and the merger was accounted for under the purchase method.



| | (3) | The period of combining the dissolved companys operating result:
| | --- | -----------------------------------------------------------------



The operating result for the period from July 1, 2004 to December 31, 2004 of the dissolved company was integrated into the operating result of the
Company.



| | (4) | Acquisition cost and the types, quantities, and amount of securities issued for the merger:
| | --- | -------------------------------------------------------------------------------------------



According to the agreement, 357,143 thousand common shares, amounting to NT$3,571 million, were newly issued by the Company
for the merger. The newly issued shares were allocated to the dissolved companys shareholders in proportion to their ownership. 2.24 common shares were to be exchanged for 1 new share. Since SiSMC was not a public company, there is no market
value. Thus, the acquisition cost was determined based on the appraisal made by China Property Appraising Center Co., Ltd.



| | (5) | Amortization method and useful lives for goodwill or deferred credit:
| | --- | ---------------------------------------------------------------------



The difference between the acquisition cost and the fair value of identifiable net assets was recognized as goodwill, which was to be amortized under the
straight-line method for 15 years according to the Article 35 of Enterprise Mergers and Acquisitions Law of the ROC.



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (6) | Contingent price, warrants, or commitments and accounting treatments in the merger contracts:
| | --- | ---------------------------------------------------------------------------------------------



None.



| | (7) | Decisions of disposal of significant assets from the merger:
| | --- | ------------------------------------------------------------



None.



| | (8) | Pro forma information on operating results:
| | --- | -------------------------------------------



The operating result for the period from July 1, 2004 to December 31, 2004 of the dissolved company was consolidated into the financial statements of the
Company.



Since SiSMC was split from Silicon Integrated
Systems Corp. on December 15, 2003, the pro forma operating results from January 1, 2003 to December 14, 2003 of SiSMC are included in the following pro forma information. The pro forma information on the operating results stated below is based on
the assumption that the Company merged with SiSMC on January 1, 2003 and 2004.



|                                       |  |                                 |  |            
|-------------------------------------- |  | ------------------------------- |  | -----------
|                                       |  | For the year ended December 31,
|(Shares expressed in thousands)        |  | 2003                            |  | 2004       
|                                       |  | NT$000                         |  | NT$000    
|Net operating revenues                 |  | 102,508,661                     |  | 131,446,247
|Net income                             |  | 12,968,078                      |  | 30,669,982 
|Weighted average of shares outstanding |  | 17,032,221                      |  | 17,021,234 
|Earnings per share-basic (in dollars)  |  | 0.76                            |  | 1.80       



25. Related Party Transactions



|                                      |  |                
|------------------------------------- |  | ---------------
|Name of related parties               |  | Relationship   
|United Foundry Service, Inc.          |  | Equity investee
|UMC Capital Corporation               |  | Equity investee
|United Microelectronics Corp. (Samoa) |  | Equity investee
|Fortune Venture Capital Corporation   |  | Equity investee
|DuPont Photomasks Taiwan Ltd. (DPT)   |  | Equity investee
|Holtek Semiconductor Inc. (Holtek)    |  | Equity investee
|Integrated Technology Express Inc.    |  | Equity investee
|Unimicron Technology Corp.            |  | Equity investee
|Applied Component Technology Corp.    |  | Equity investee
|Novatek Microelectronics Corp.        |  | Equity investee
|Faraday Technology Corp. (Faraday)    |  | Equity investee
|Silicon Integrated Systems Corp.      |  | Equity investee



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



|                                                                                                |  |                                                                     
|----------------------------------------------------------------------------------------------- |  | --------------------------------------------------------------------
|Name of related parties                                                                         |  | Relationship with the Company                                       
|AMIC Technology Corporation                                                                     |  | Equity investee                                                     
|Pacific Venture Capital Co., Ltd.                                                               |  | Equity investee                                                     
|MediaTek Incorporation (MediaTek)                                                               |  | The Company is its supervisor                                       
|AU Optronics Corp. (Discharged on April 22, 2004)                                               |  | The Company is its director and supervisor                          
|Industrial Bank of Taiwan Corp. (IBT) (Holding shares were below 5% in the 3rd quarter of 2004) |  | The Company is its major shareholder                                
|Chiao Tung Bank Co., Ltd. (Chiao Tung)                                                          |  | The Company is its parent companys director and supervisor         
|Davicom Semiconductor, Inc.                                                                     |  | Subsidiarys equity investee                                        
|Aptos (Taiwan) Corp.                                                                            |  | Subsidiarys equity investee                                        
|United Radiotek Incorporation                                                                   |  | Subsidiarys equity investee                                        
|UCA Technology, Inc.                                                                            |  | Subsidiarys equity investee                                        
|AFA Technologies, Inc.                                                                          |  | Subsidiarys equity investee                                        
|Harvatek Corp.                                                                                  |  | Subsidiarys equity investee                                        
|Thintek Optronics Corp.                                                                         |  | Subsidiarys equity investee                                        
|Star Semiconductor Corp.                                                                        |  | Subsidiarys equity investee                                        
|AEVOE Inc.                                                                                      |  | Subsidiarys equity investee                                        
|Ubit Technology Inc.                                                                            |  | Subsidiarys equity investee                                        
|Smedia Technology Corp.                                                                         |  | Subsidiarys equity investee                                        
|U-Media Technology, Inc.                                                                        |  | Subsidiarys equity investee                                        
|Averlogic Corporation                                                                           |  | Subsidiary is its director and supervisor                           
|Epitech Corp.                                                                                   |  | Subsidiary is its director and supervisor                           
|Coretronic Corporation                                                                          |  | Subsidiary is its director and supervisor                           
|Printech International, Inc.                                                                    |  | Subsidiary is its director and supervisor                           
|Fortune Semiconductor Corporation                                                               |  | Subsidiary is its director                                          
|Princeton Technology Corporation                                                                |  | Subsidiary is its director                                          
|Silicon 7, Inc.                                                                                 |  | Subsidiary is its director                                          
|Shin-Etsu Handotai Taiwan Co., Ltd. (Shin-Etsu)                                                 |  | Subsidiary is its director                                          
|Kits Online Technology Corp.                                                                    |  | Subsidiary is its director                                          
|Giga Solution Tech. Co., Ltd.                                                                   |  | Subsidiary is its director                                          
|Pixart Imaging, Inc.                                                                            |  | Subsidiary is its director                                          
|InComm Technologies Co., Ltd.                                                                   |  | Subsidiary is its director                                          
|Trendchip Technologies Corp.                                                                    |  | Subsidiary is its director                                          
|Programmable Microelectronics (Taiwan) Corp.                                                    |  | Subsidiary is its director                                          
|LighTuning Tech., Inc. Cion Technology Corp.                                                    |  | Subsidiary is its director and supervisor Subsidiary is
its director
|VastView Technology Inc.                                                                        |  | Subsidiary is its director and supervisor                           
|XGI Technology Inc.                                                                             |  | Affiliate Company                                                   



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Significant Related Party Transactions



| | (1) | Operating revenues
| | --- | ------------------



|         |  |                                 |  |            |  |            |  |            |  |            |  |           
|-------- |  | ------------------------------- |  | ---------- |  | ---------- |  | ---------- |  | ---------- |  | ----------
|         |  | For the year ended December 31,
|         |  | 2002                            |  | 2003       |  | 2004      
|         |  | Amount                          |  | Percentage |  | Amount     |  | Percentage |  | Amount     |  | Percentage
|         |  | NT$000                         |  |            |  | NT$000    |  |            |  | NT$000    |  |           
|MediaTek |  | 9,637,752                       |  | 13         |  | 9,298,407  |  | 10         |  | 8,494,486  |  | 7         
|Others   |  | 6,682,023                       |  | 9          |  | 8,614,577  |  | 9          |  | 12,138,274 |  | 9         
|         |  |                                 |  |            |  |            |  |            |  |            |  |           
|Total    |  | 16,319,775                      |  | 22         |  | 17,912,984 |  | 19         |  | 20,632,760 |  | 16        
|         |  |                                 |  |            |  |            |  |            |  |            |  |           



The sales price to
the above related parties was determined through mutual agreement based on the market conditions. The collection period for overseas sales was net 30~60 days for the related parties and 30~60 days for third-party customers, while the terms for
domestic sales were month-end 30~60 days for the related parties and 30~60 days for the third-party customers.



| | (2) | Purchases
| | --- | ---------



|          |  |                                 |  |            |  |           |  |            |  |           |  |           
|--------- |  | ------------------------------- |  | ---------- |  | --------- |  | ---------- |  | --------- |  | ----------
|          |  | For the year ended December 31,
|          |  | 2002                            |  | 2003       |  | 2004     
|          |  | Amount                          |  | Percentage |  | Amount    |  | Percentage |  | Amount    |  | Percentage
|          |  | NT$000                         |  |            |  | NT$000   |  |            |  | NT$000   |  |           
|Shin-Etsu |  | 2,273,128                       |  | 14         |  | 2,698,980 |  | 14         |  | 3,952,085 |  | 15        
|Others    |  | 219,235                         |  | 1          |  | 288,289   |  | 2          |  | 317,206   |  | 1         
|          |  |                                 |  |            |  |           |  |            |  |           |  |           
|Total     |  | 2,492,363                       |  | 15         |  | 2,987,269 |  | 16         |  | 4,269,291 |  | 16        
|          |  |                                 |  |            |  |           |  |            |  |           |  |           



The purchases from the
above related parties were dealt with in the ordinary course of business similar to those from third-party suppliers. The payment terms for purchase from overseas were net 60 days for the related parties and net 30~90 days for the third-party
suppliers, respectively, while the terms for domestic purchases were month-end 60 days and month-end 30~90 days for the related parties and third-party suppliers.



| | (3) | Notes receivable
| | --- | ----------------



|       |  |                    |  |            |  |         |  |           
|------ |  | ------------------ |  | ---------- |  | ------- |  | ----------
|       |  | As of December 31,
|       |  | 2003               |  | 2004      
|       |  | Amount             |  | Percentage |  | Amount  |  | Percentage
|       |  | NT$000            |  |            |  | NT$000 |  |           
|Holtek |  | 101,203            |  | 92         |  | 39,034  |  | 95        
|Others |  | 550                |  |           |  |        |  |          
|       |  |                    |  |            |  |         |  |           
|Total  |  | 101,753            |  | 92         |  | 39,034  |  | 95        
|       |  |                    |  |            |  |         |  |           



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (4) | Accounts receivable, net
| | --- | ------------------------



|                                                |  |                    |   |      |            |  |           |   |  |           
|----------------------------------------------- |  | ------------------ | - | ---- | ---------- |  | --------- | - |  | ----------
|                                                |  | As of December 31,
|                                                |  | 2003               |   | 2004
|                                                |  | Amount             |   |      | Percentage |  | Amount    |   |  | Percentage
|                                                |  | NT$000            |   |      |            |  | NT$000   |   |  |           
|MediaTek                                        |  | 1,713,842          |   |      | 9          |  | 1,026,286 |   |  | 8         
|Others                                          |  | 1,955,802          |   |      | 11         |  | 1,241,651 |   |  | 9         
|                                                |  |                    |   |      |            |  |           |   |  |           
|Total                                           |  | 3,669,644          |   |      | 20         |  | 2,267,937 |   |  | 17        
|                                                |  |                    |   |      |            |  |           |   |  |           
|Less: Allowance for sales returns and discounts |  | (283,420           | ) |      |            |  | (200,143  | ) |  |           
|Less: Allowance for doubtful accounts           |  | (100,853           | ) |      |            |  | (31,006   | ) |  |           
|                                                |  |                    |   |      |            |  |           |   |  |           
|Net                                             |  | 3,285,371          |   |      |            |  | 2,036,788 |   |  |           
|                                                |  |                    |   |      |            |  |           |   |  |           
|                                                | 
|(5)    Accounts payable                         |  |                   
|                                                | 
|                                                |  | As of December 31,
|                                                |  | 2003               |   | 2004
|                                                |  | Amount             |   |      | Percentage |  | Amount    |   |  | Percentage
|                                                |  | NT$000            |   |      |            |  | NT$000   |   |  |           
|Shin-Etsu                                       |  | 754,354            |   |      | 11         |  | 628,641   |   |  | 12        
|Others                                          |  | 58,495             |   |      | 1          |  | 53,407    |   |  | 1         
|                                                |  |                    |   |      |            |  |           |   |  |           
|Total                                           |  | 812,849            |   |      | 12         |  | 682,048   |   |  | 13        
|                                                |  |                    |   |      |            |  |           |   |  |           



| | (6) | Loans
| | --- | -----



|           |  |                                      |  |                |  |               |  |                 |  |        
|---------- |  | ------------------------------------ |  | -------------- |  | ------------- |  | --------------- |  | -------
|           |  | For the year ended December 31, 2002
|           |  | Maximum balance                      |  | Ending balance |  | Interest rate |  | Interestexpense
|           |  | Amount                               |  | Month          |  |               | 
|           |  | NT$000                              |  |                |  | NT$000       |  |                 |  | NT$000
|Chiao Tung |  | 1,224,575                            |  | January        |  | 868,195       |  | 2.07%-4.00%     |  | 32,717 
|IBT        |  | 998,750                              |  | January        |  | 783,296       |  | 2.89%-3.94%     |  | 16,216 
|           |  |                                      |  |                |  |               |  |                 |  |        
|Total      |  |                                      |  |                |  | 1,651,491     |  |                 |  | 48,933 
|           |  |                                      |  |                |  |               |  |                 |  |        
|           | 
|           |  | For the year ended December 31, 2003
|           |  | Maximum balance                      |  | Ending balance |  | Interest rate |  | Interestexpense
|           |  | Amount                               |  | Month          |  |               | 
|           |  | NT$000                              |  |                |  | NT$000       |  |                 |  | NT$000
|Chiao Tung |  | 865,796                              |  | January        |  | 282,557       |  | 1.66%-2.68%     |  | 15,840 
|IBT        |  | 783,296                              |  | January        |  |              |  | 2.54%-2.89%     |  | 2,535  
|           |  |                                      |  |                |  |               |  |                 |  |        
|Total      |  |                                      |  |                |  | 282,557       |  |                 |  | 18,375 
|           |  |                                      |  |                |  |               |  |                 |  |        



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



|           |  |                                      |  |                |  |               |  |                 |  |        
|---------- |  | ------------------------------------ |  | -------------- |  | ------------- |  | --------------- |  | -------
|           |  | For the year ended December 31, 2004
|           |  | Maximum balance                      |  | Ending balance |  | Interest rate |  | Interestexpense
|           |  | Amount                               |  | Month          |  |               | 
|           |  | NT$000                              |  |                |  | NT$000       |  |                 |  | NT$000
|Chiao Tung |  | 282,547                              |  | January        |  |              |  | 1.83%-2.53%     |  | 2,453  
|           |  |                                      |  |                |  |               |  |                 |  |        



| | (7) | Disposal of property, plant and equipment
| | --- | -----------------------------------------



The Group had no significant disposal of property, plant and equipment with related parties for the years ended December 31, 2002, 2003 and 2004.



| | (8) | Other transactions
| | --- | ------------------



The Group has made several other transactions, including service charges, joint development expenses of intellectual property, subcontract expenses and
commissions etc., with related parties totaling approximately NT$363 million, NT$493 million and NT$596 million for the years ended December 31, 2002, 2003 and 2004, respectively.



As of December 31, 2003, the joint development contracts of intellectual property entered into with Faraday have amounted to
approximately NT$1,589 million, and a total amount of NT$584 million has been paid. As of December 31, 2004, the joint development contracts of intellectual property entered into with Faraday have amounted to approximately NT$2,185 million, and a
total amount of NT$1,142 million has been paid.



The Company
has purchased approximately NT$917 million, NT$524 million and NT$442 million of masks from DPT during the years ended December 31, 2002, 2003 and 2004, respectively.



As of December 31, 2003 and 2004, other receivables arising from usage of facilities and rental revenues from related
parties are NT$84 million and NT$7 million, respectively.



26. Assets Pledged
as Collateral



As of December 31, 2003 and 2004, the
following assets have been pledged as collateral against certain obligations of the Group.



|                                         |  |                    |  |                   |  |                                  
|---------------------------------------- |  | ------------------ |  | ----------------- |  | ---------------------------------
|                                         |  | As of December 31, |  | Purpose of pledge
|Assets Pledged                           |  | 2003               |  | 2004              | 
|                                         |  | NT$000            |  | NT$000           |  |                                  
|Time deposits                            |  | 178,691            |  | 5,000             |  | Long-term loans                  
|Land                                     |  | 452,916            |  |                  |  | Long-term loans                  
|Buildings                                |  | 1,201,678          |  |                  |  | Long-term loans                  
|Machinery and equipment                  |  | 11,127,841         |  | 30,054,212        |  | Long-term loans and bonds payable
|Construction in progress and prepayments |  | 1,151,543          |  |                  |  | Long-term loans                  
|                                         |  |                    |  |                   |  |                                  
|Total                                    |  | 14,112,669         |  | 30,059,212        |  |                                  
|                                         |  |                    |  |                   |  |                                  



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



27. Commitments and Contingent Liabilities



| | (1) | The Company has entered into several patent license agreements and joint development contracts of intellectual property for a total contract amount of approximately NT$19 billion.
Royalties and joint development fees for the future years are set out as follows:
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|                                |  |          
|------------------------------- |  | ---------
|For the year ended December 31, |  | Amount   
|                                |  | NT$000  
|2005                            |  | 3,267,197
|2006                            |  | 1,421,768
|2007                            |  | 1,521,573
|2008                            |  | 293,444  
|2009                            |  | 127,449  
|                                |  |          
|Total                           |  | 6,631,431
|                                |  |          



| | (2) | The Company signed several construction contracts for the expansion of its factory space. As of December 31, 2004, these construction contracts have amounted to approximately
NT$0.55 billion and the unpaid portion of the contracts was approximately NT$0.42 billion.
| | --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (3) | Oak Technology, Inc. (Oak) and the Company entered into a settlement agreement on July 31, 1997 concerning a complaint filed with the United States International Trade Commission
(ITC) by Oak against the Company and others, alleging unfair trade practices based on alleged patent infringement regarding certain CD-ROM controllers. On October 27, 1997, Oak filed a civil action in a California federal district court, alleging
claims for breach of the settlement agreement and fraudulent misrepresentation. The Company has formally denied the material allegations of the Complaint, and asserted counterclaims against Oak for breach of contract, intentional interference with
economic advantage and rescission and restitution based on fraudulent concealment and/or mistake. The Company also asserted declaratory judgment claims for invalidity and unenforceability of the relevant Oak patent. On May 2, 2001, the United States
Court of Appeals for the Federal Circuit upheld the ITCs findings of no patent infringement and no unfair trade practice arising out of a second ITC case filed by Oak against the Company and others. Based on the Federal Circuits opinion
and on a covenant not to sue filed by Oak, the declaratory judgment patent counterclaims were disclaimed from the district court case. However, in connection with its breach of contract and other claims, Oak seeks damages in excess of US$750
million. The district court has not yet set dates for dispositive motions or for trial. The Company believes that Oaks claims are meritless, and intends to vigorously defend the suit, and to pursue its counterclaims. As with all litigation,
however, the Company cannot predict the outcome with certainty.
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (4) | The Group entered into several operating lease contracts for land. These operating leases expire in various years through 2032 and are renewable. Future minimum lease payments under
those leases are as follows:
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|                                |  |          
|------------------------------- |  | ---------
|For the year ended December 31, |  | Amount   
|                                |  | NT$000  
|2005                            |  | 210,875  
|2006                            |  | 205,125  
|2007                            |  | 190,028  
|2008                            |  | 186,833  
|2009 and thereafter             |  | 2,393,672
|                                |  |          
|Total                           |  | 3,186,533
|                                |  |          



| | (5) | The Company entered into several wafer-processing contracts with its customers. According to the contracts, the Company shall guarantee processing capacity, while these customers
make deposits to the Company.
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



28. Significant Disaster Loss



None.



29. Significant Subsequent Events



On February 15, 2005, the Hsinchu District Prosecutors Office
conducted a search of the Companys facilities to investigate possible criminal offenses committed by the Companys Vice Chairman arising from an alleged relationship between Hejian Technology (Suzhou) Co., Ltd. (Hejian), a
semiconductor manufacturer in Suzhou, China, and the Company. It was alleged that the Companys Vice Chairman breached his fiduciary duty to the Company and violated ROC securities laws. In March 2005, the Hsinchu District Prosecutors
Office expanded its investigation to include approximately 25 defendants, including the Companys Chairman and Vice Chairman. It was alleged that the defendants collectively moved the Companys funds, technology, equipment, customers
orders and labor resources to Hejian without regulatory approval which constituted a violations of ROC securities laws and a breach of fiduciary duty to the Company. As of June 10, 2005, no formal charge had been filed against the Company or any of
its officials, including its Chairman and Vice Chairman. The outcome of this matter is not determinable and is uncertain at this time.



Coinciding with the investigation conducted by the Hsinchu District Prosecutors Office, the ROC Financial Supervisory Commission, or FSC, a
regulatory authority that supervises securities, banking, futures, and insurance activities in Taiwan, initiated a separate investigation into alleged violation of ROC securities laws by the Company and its officials. In April 2005, the FSC fined
the Companys Chairman NT$3.0 million for the delay or failure to make timely public disclosure concerning certain information relating to Hejian. In addition to the fines against its Chairman, the Company was fined NT$30,000 by the Taiwan
Stock Exchange for its delay in making public disclosure concerning certain information relating to Hejian. Although the Company and its Chairman have respectively appealed the fines, the outcome of these appeals is not known at this time.



30. Certain comparative amounts have been reclassified to conform to the
current years presentation.



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



31. Financial Instruments



| | (1) | Financial instruments
| | --- | ---------------------



|                                                                 |  |                    |  |             |      |  |             |  |             |  
|---------------------------------------------------------------- |  | ------------------ |  | ----------- | ---- |  | ----------- |  | ----------- | -
|                                                                 |  | As of December 31, | 
|                                                                 |  | 2003               |  |             | 2004 | 
|Non-derivative Financial Instruments                             |  | Book Value         |  | Fair Value  |      |  | Book Value  |  | Fair Value  |  
|                                                                 |  | NT$000            |  | NT$000     |      |  | NT$000     |  | NT$000     |  
|Financial assets                                                 |  |                    |  |             |      |  |             |  |             |  
|Cash and cash equivalents                                        |  | 118,771,773        |  | 118,771,773 |      |  | 101,381,973 |  | 101,381,973 |  
|Marketable securities                                            |  | 1,820,328          |  | 2,278,195   |      |  | 3,143,697   |  | 3,176,319   |  
|Notes and accounts receivables                                   |  | 19,183,894         |  | 19,183,894  |      |  | 14,007,099  |  | 14,007,099  |  
|Long-term investments                                            |  | 38,859,249         |  | 83,057,858  |      |  | 32,712,278  |  | 75,610,904  |  
|Financial liabilities                                            |  |                    |  |             |      |  |             |  |             |  
|Short-term loans                                                 |  | 1,884,899          |  | 1,884,899   |      |  | 2,986,919   |  | 2,986,919   |  
|Payables                                                         |  | 19,563,678         |  | 19,563,678  |      |  | 23,113,196  |  | 23,113,196  |  
|Bonds payable (current portion included)                         |  | 74,919,629         |  | 77,402,957  |      |  | 45,838,764  |  | 46,217,941  |  
|Long-term loans (current portion included)                       |  | 6,338,144          |  | 6,338,144   |      |  | 23,710,500  |  | 23,710,500  |  
|Derivative Financial Instruments                                 |  |                    |  |             |      |  |             |  |             |  
|Credit-linked deposits and repackage bonds - non-trading purpose |  | 4,166,594          |  | 4,166,594   |      |  | 2,942,434   |  | 2,942,434   |  
|Interest rate swaps - non-trading purpose                        |  | 128,539            |  | (18,882     | )    |  | 35,532      |  | (416,149    | )
|Forward contracts - non-trading purpose                          |  |                   |  |            |      |  | 38,633      |  | 38,633      |  



The methods and
assumptions used to measure the fair value of financial instruments are as follows:



| | a. | The book values of short-term financial instruments and other financial assets (credit-linked deposits and repackage bonds) approximate fair values due to their short maturities.
The majority of investment portfolios of the credit-linked deposits and repackage bonds are either corporate bonds of maturity within one year, or highly liquidable secondary market bonds. Short-term financial instruments include cash and cash
equivalents, notes receivable, accounts receivable, short-term loans, and payables.
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | b. | The fair values of marketable securities and long-term investments are based on the quoted market value. If the market values of marketable securities and long-term investments are
unavailable, the net assets values of the investees are used as fair values.
| | -- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | c. | The fair values of bonds payable are determined by the market value. The book values of long-term loans approximate the fair values as the loans bear floating rates.
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | d. | The fair values of derivative financial instruments are based on the amount the Company expects to receive (positive) or to pay (negative) assuming that the contracts are settled
early at the balance sheet date.
| | -- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (2) | The Company and its subsidiary, UMCJ, held credit-linked deposits and repackage bonds for the earning of interest income. Details are disclosed as follows:
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | Principal amount in original currency
| | -- | -------------------------------------



As of December 31, 2003



The Company



|                                                                                |  |        |  |               |  |           
|------------------------------------------------------------------------------- |  | ------ |  | ------------- |  | ----------
|Credit-linked deposits and repackage bonds referenced to                        |  | Amount |  | Due Date     
|Siliconwave Precision Industries Co., Ltd. European Convertible Bonds and Loans |  | USD    |  | 5 million     |  | 2004.07.30
|Siliconwave Precision Industries Co., Ltd. European Convertible Bonds and Loans |  | USD    |  | 5 million     |  | 2004.07.30
|Siliconwave Precision Industries Co., Ltd. European Convertible Bonds           |  | USD    |  | 5 million     |  | 2004.07.28
|Siliconwave Precision Industries Co., Ltd. European Convertible Bonds           |  | USD    |  | 10 million    |  | 2004.08.02
|Siliconwave Precision Industries Co., Ltd. European Convertible Bonds           |  | USD    |  | 5 million     |  | 2004.08.01
|Siliconwave Precision Industries Co., Ltd. European Convertible Bonds and Loans |  | NTD    |  | 210 million   |  | 2004.07.30
|King Yuan Electronics Co., Ltd. European Convertible Bonds                      |  | USD    |  | 4.2 million   |  | 2004.04.18
|Chi Feng Blinds Industry Co., Ltd. European Convertible Bonds                   |  | USD    |  | 2 million     |  | 2005.12.19
|Stark Technology, Inc. European convertible Bonds                               |  | USD    |  | 5 million     |  | 2004.07.10
|UMCi Ltd. Loans                                                                 |  | USD    |  | 15 million    |  | 2004.03.10
|UMC Japan European Convertible Bonds                                            |  | JPY    |  | 1,000 million |  | 2007.03.28



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



The Company



|                                                                                                                 |  |        |  |             |  |           
|---------------------------------------------------------------------------------------------------------------- |  | ------ |  | ----------- |  | ----------
|Credit-linked deposits and repackage bonds referenced to                                                         |  | Amount |  | Due Date   
|UMC Japan European Convertible Bonds                                                                             |  | JPY    |  | 600 million |  | 2007.11.29
|UMC Japan European Convertible Bonds                                                                             |  | JPY    |  | 400 million |  | 2007.11.02
|The Companys Convertible Bonds                                                                                  |  | NTD    |  | 100 million |  | 2004.03.05
|Cathay Financial Holding Co., Ltd. European Convertible Bonds                                                    |  | USD    |  | 3 million   |  | 2005.05.23
|Cathay Financial Holding Co., Ltd. European Convertible Bonds                                                    |  | USD    |  | 2 million   |  | 2005.05.23
|Fubon Holding Co., Ltd., Siliconwave Precision Industries Co., Ltd. and the Companys European Convertible Bonds |  | USD    |  | 5 million   |  | 2004.07.30



UMCJ



|                                                         |  |        |  |               |  |           
|-------------------------------------------------------- |  | ------ |  | ------------- |  | ----------
|Credit-linked deposits and repackage bonds referenced to |  | Amount |  | Due Date     
|UMC Japan European Convertible Bonds                     |  | JPY    |  | 1,000 million |  | 2007.03.29
|UMC Japan European Convertible Bonds                     |  | JPY    |  | 2,000 million |  | 2007.11.28
|UMC Japan European Convertible Bonds                     |  | JPY    |  | 1,100 million |  | 2007.03.29



As of December 31,
2004



The Company



|                                                                                |  |        |  |             |  |           
|------------------------------------------------------------------------------- |  | ------ |  | ----------- |  | ----------
|Credit-linked deposits and repackage bonds referenced to                        |  | Amount |  | Due Date   
|Siliconwave Precision Industries Co., Ltd. European Convertible Bonds and Loans |  | NTD    |  | 400 million |  | 2007.02.05
|Siliconwave Precision Industries Co., Ltd. European Convertible Bonds and Loans |  | NTD    |  | 200 million |  | 2007.02.05
|Chi Feng Blinds Industry Co., Ltd. European Convertible Bonds                   |  | USD    |  | 2 million   |  | 2005.12.19
|HannStar Display Corporation European Convertible Bonds                         |  | USD    |  | 5 million   |  | 2005.10.19
|UMC Japan European Convertible Bonds                                            |  | JPY    |  | 640 million |  | 2007.03.28
|UMC Japan European Convertible Bonds                                            |  | JPY    |  | 600 million |  | 2007.11.29
|UMC Japan European Convertible Bonds                                            |  | JPY    |  | 400 million |  | 2007.11.29
|Cathay Financial Holding Co., Ltd. European Convertible Bonds                   |  | USD    |  | 3 million   |  | 2005.05.23
|Cathay Financial Holding Co., Ltd. European Convertible Bonds                   |  | USD    |  | 2 million   |  | 2005.05.23
|Advanced Semiconductor Engineering Inc. European Convertible Bonds and Loans    |  | NTD    |  | 200 million |  | 2007.09.25



UMCJ



|                                                         |  |        |  |               |  |           
|-------------------------------------------------------- |  | ------ |  | ------------- |  | ----------
|Credit-linked deposits and repackage bonds referenced to |  | Amount |  | Due Date     
|UMC Japan European Convertible Bonds                     |  | JPY    |  | 1,000 million |  | 2007.03.29
|UMC Japan European Convertible Bonds                     |  | JPY    |  | 2,000 million |  | 2007.11.28
|UMC Japan European Convertible Bonds                     |  | JPY    |  | 1,100 million |  | 2007.03.29



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | b. | Credit risk
| | -- | -----------



The counterparties of the above investments are major international financial institutions. The repayment in full of these investments is subject to the
non-occurrence of one or more credit events, which are referenced to the entities fulfillment of their own obligations as well as repayment of their corporate bonds. Upon the occurrence of one or more of such credit events, the Company and its
subsidiary-UMCJ may receive nil or less than full amount of these investments. The Company and its subsidiary-UMCJ have selected reference entities with high credit ratings to minimize the credit risk.



| | c. | Liquidity risk
| | -- | --------------



Early withdrawal is not allowed for the above investments unless called by the issuer. However, the anticipated liquidity risk is low since most of the
investments will be matured within 1 year or are relatively liquid in the secondary market.



| | d. | Market risk
| | -- | -----------



There is no market risk for the above investments except for the fluctuations in the exchange rates of US Dollars and Japanese Yen to NT Dollars on the
balance sheet date and the settlement date.



| | (3) | The Company entered into interest rate swap and forward contracts and its subsidiaries, UMCi and UMCJ, entered into forward contracts for hedging the interest rate risks arising
from the counter-floating rate of domestic bonds and for hedging the exchange rate risks arising from the net assets or liabilities denominated in foreign currency. The hedging strategy was developed with the objective to reduce the market risk, and
not for trading purpose. The relevant information on the derivative financial instruments entered into by the Company and its subsidiaries, UMCi and UMCJ, is as follows:
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | The Company utilized interest rate swap agreements to hedge its interest rate risks on its counter-floating rate domestic bonds issued from May 21 to June 24, 2003. The periods of
the interest rate swap agreements are the same as those of the domestic bonds, which are five and seven years. The floating rate is reset annually. The details of interest rate swap agreements are summarized as follows:
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



As of December 31, 2003, and 2004, the Company had the following interest rate swap agreements in
effect:



|                 |  |                              |  |                               |  |                   
|---------------- |  | ---------------------------- |  | ----------------------------- |  | ------------------
|Notional Amount  |  | Contract Period              |  | Interest Rate Received        |  | Interest Rate Paid
|NT$7,500 million |  | May 20, 2003 to May 20, 2008 |  | 4.0% minus USD 12-month LIBOR |  | 1.52%             
|NT$7,500 million |  | May 20, 2003 to May 20, 2010 |  | 4.3% minus USD 12-month LIBOR |  | 1.48%             



| | b. | The details of forward contracts entered into by the Company and its subsidiaries, UMCi and UMCJ, are summarized as follows:
| | -- | ----------------------------------------------------------------------------------------------------------------------------



As of December 31, 2003



UMCi



|                  |  |                     |  |                                      
|----------------- |  | ------------------- |  | -------------------------------------
|Type              |  | Notional
Amount     |  | Contract Period                      
|Forward contracts |  | Buy EUR 67 million  |  | December 31, 2003 to January 26, 2004
|                  |  | Sell USD 84 million |  |                                      



As
of December 31, 2004



The Company



|                  |  |                     |  |                                      
|----------------- |  | ------------------- |  | -------------------------------------
|Type              |  | Notional
Amount     |  | Contract
Period                      
|Forward contracts |  | Sell USD 77 million |  | December 23, 2004 to January 20, 2005



UMCJ



|                  |  |                     |  |                                      
|----------------- |  | ------------------- |  | -------------------------------------
|Type              |  | Notional
Amount     |  | Contract
Period                      
|Forward contracts |  | Sell USD 10 million |  | December 30, 2004 to January 04, 2005



| | c. | Transaction risk
| | -- | ----------------



| | (a) | Credit risk
| | --- | -----------



There is no significant credit risk exposure with respect to the above transactions because the counterparties are reputable financial institutions with
good global standing.



| | (b) | Liquidity and cash flow risk
| | --- | ----------------------------



The cash flow requirements on the interest rate swap agreements are limited to the net interest payables or receivables arising from the differences in
the swap rates. The cash flow requirements on forward contracts are limited to the net difference between the forward and spot rates at the settlement date. Therefore, no significant cash flow risk is anticipated since the working capital is
sufficient to meet the cash flow requirements.



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (c) | Market risk
| | --- | -----------



Interest rate swap agreements and forward contracts are intended for hedging purposes. Gains or losses arising from the fluctuations in interest rates
and exchange rates are likely to be offset against the gains or losses from the hedged items. As a result, no significant exposure to market risk is anticipated.



| | (d) | The presentation of derivative financial instruments on financial statements
| | --- | ----------------------------------------------------------------------------



The net receivables or payables resulting from interest rate swap and forward contracts were recorded under current assets or current liabilities.



As of December 31, 2003 and 2004, the balances of current
assets arising from interest rate swap were NT$129 million and NT$36 million, respectively.



As of December 31, 2004, the balance of current assets arising from forward contracts was NT$39 million and related exchange loss in NT$310 million was recorded under non-operating expenses for the year ended December
31, 2004.



32. Segment Information



| | (1) | Operations in different industries
| | --- | ----------------------------------



The Groups major business is operating as a full service semiconductor foundry.



| | (2) | Operations in different geographic areas
| | --- | ----------------------------------------



The geographic region to which revenue is assigned is based on the location of the Group or its subsidiaries to which revenue earned from external
customers is attributable.



|                       |  |                                 |  |                   |  |                        |  |                   |  |                        |  |                  
|---------------------- |  | ------------------------------- |  | ----------------- |  | ---------------------- |  | ----------------- |  | ---------------------- |  | -----------------
|                       |  | For the year ended December 31,
|                       |  | 2002                            |  | 2003              |  | 2004                  
|                       |  | Net operatingRevenues           |  | Long-lived assets |  | Net operating Revenues |  | Long-lived assets |  | Net operating Revenues |  | Long-lived assets
|                       |  | NT$000                         |  | NT$000           |  | NT$000                |  | NT$000           |  | NT$000                |  | NT$000          
|Taiwan                 |  | 35,622,456                      |  | 148,650,597       |  | 42,870,696             |  | 119,837,725       |  | 43,369,100             |  | 142,123,090      
|Asia, excluding Taiwan |  | 7,298,697                       |  | 22,088,806        |  | 10,548,816             |  | 33,395,966        |  | 11,139,860             |  | 58,557,465       
|North America          |  | 28,612,248                      |  | 66,722            |  | 35,698,268             |  | 32,072            |  | 54,856,841             |  | 72,668           
|Europe and others      |  | 3,891,955                       |  | 27,898            |  | 6,585,952              |  | 21,207            |  | 19,824,939             |  | 15,116           
|                       |  |                                 |  |                   |  |                        |  |                   |  |                        |  |                  
|                       |  | 75,425,356                      |  | 170,834,023       |  | 95,703,732             |  | 153,286,970       |  | 129,190,740            |  | 200,768,339      
|                       |  |                                 |  |                   |  |                        |  |                   |  |                        |  |                  



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33. US GAAP Reconciliation



The accompanying consolidated financial statements have been prepared in conformity with generally accepted accounting principles in the Republic of
China (ROC GAAP), which differ in certain material respects from generally accepted accounting principles in the United States (US GAAP). Such differences include methods of consolidation and methods for measuring the amounts shown in the financial
statements, as well as additional disclosures required by US GAAP. Material GAAP differences are stated below.



Translations of amounts from NT into United States dollars for the convenience of the reader were calculated at the noon buying rate of US$1.00 to NT31.74
on December 31, 2004 in The City of New York for cable transfers of NT as certified for customs purposes by the Federal Reserve Bank of New York. No representation is made that the NT amounts could have been, or could be, converted into United
States dollars at such rate.



| | (1) | Compensation
| | --- | ------------



|                                                                                                        |  |                                 |   |  |            |   |  |            |  
|------------------------------------------------------------------------------------------------------- |  | ------------------------------- | - |  | ---------- | - |  | ---------- | -
|                                                                                                        |  | For the year ended December 31, |  
|                                                                                                        |  | 2002                            |   |  | 2003       |   |  | 2004       |  
|                                                                                                        |  | NT$000                         |   |  | NT$000    |   |  | NT$000    |  
|Net income impact of compensation adjustments                                                           |  |                                 |   |  |            |   |  |            |  
|US GAAP adjustments:                                                                                    |  |                                 |   |  |            |   |  |            |  
|Remuneration to directors and supervisors                                                               |  | (6,365                          | ) |  | (11,903    | ) |  | (28,659    | )
|Treasury stock transferred to employees                                                                 |  |                                |   |  | (699,742   | ) |  |           |  
|Employees bonus                                                                                        |  |                                 |   |  |            |   |  |            |  
|Accrual                                                                                                 |  | (823,702                        | ) |  | (1,838,363 | ) |  | (2,527,721 | )
|Adjustment to fair market value                                                                         |  | (6,592,188                      | ) |  | (433,422   | ) |  | (1,024,277 | )
|                                                                                                        |  |                                 |   |  |            |   |  |            |  
|Total employees bonus                                                                                  |  | (7,415,890                      | ) |  | (2,271,785 | ) |  | (3,551,998 | )
|Allocation to inventories, net of allocations to inventories in prior period and sold in current period |  | 73,338                          |   |  | 68,436     |   |  | 40,607     |  
|                                                                                                        |  |                                 |   |  |            |   |  |            |  
|Total net income adjustment relating to compensation                                                    |  | (7,348,917                      | ) |  | (2,914,994 | ) |  | (3,540,050 | )
|                                                                                                        |  |                                 |   |  |            |   |  |            |  



|                                                               |  |                    |   |  |         |  
|-------------------------------------------------------------- |  | ------------------ | - |  | ------- | -
|                                                               |  | As of December 31, |  
|                                                               |  | 2003               |   |  | 2004    |  
|                                                               |  | NT$000            |   |  | NT$000 |  
|Stockholders equity impact of compensation adjustments        |  |                    |   |  |         |  
|US GAAP adjustments:                                           |  |                    |   |  |         |  
|Remuneration to directors and supervisors                      |  | (12,618            | ) |  | (28,659 | )
|Employees bonus                                               |  | 141,774            |   |  | 182,381 |  
|                                                               |  |                    |   |  |         |  
|Total stockholders equity adjustment relating to compensation |  | 129,156            |   |  | 153,722 |  
|                                                               |  |                    |   |  |         |  



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Remuneration to directors and supervisors - The Companys Articles of Incorporation requires a
cash remuneration payment to its directors and supervisors. Under ROC GAAP, such payments are charged directly to retained earnings in the period shareholders approve such payment. Under US GAAP, such cash payments should be recorded as compensation
expense in the period when services are rendered.



Treasury
stock transferred to employees - In 2003, the Company transferred certain treasury stock to its employees at a predetermined transfer price. Under ROC GAAP, the difference between the cost of the treasury stock and the transfer price was charged to
retained earnings. Under US GAAP, the difference between the transfer price and the market price of the underlying stock at the date of transfer was recognized as compensation expense.



Employees bonus - Certain employees of the Company are entitled to bonuses in accordance with the provisions of the
Companys Articles of Incorporation. Employees bonus is determined as discussed in Note 19. Under ROC GAAP, such bonuses are appropriated from retained earnings in the period that the shareholders approval is obtained, the amount
charged against retained earnings is based on the par value of the common shares issued.



Under US GAAP, employees bonus expense is initially accrued when services are rendered and both the number of shares to be issued and the price per share are known. When bonuses are approved by the shareholders
in the subsequent year, an additional compensation expense is recorded for the difference between the amount initially recorded and the fair market value of shares granted to employees. The difference between US GAAP and ROC GAAP in this area would
result in adjustments to net income and shareholders equity as shown in the above schedules. In addition, there is also a reclassification from retained earnings to capital reserve of NT$34,186 million and NT$34,933 million at December 31,
2003 and 2004, respectively.



| | (2) | Equity Investments - Net income variance between US GAAP and ROC GAAP
| | --- | ---------------------------------------------------------------------



The Groups proportionate share of the income (loss) from an equity investee may differ if the equity investees net income (loss) under ROC
GAAP differs from US GAAP. The differences between ROC GAAP and US GAAP for the equity investees include accounting for compensation, technological know-how and investment in marketable securities, etc.



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| | (3) | Marketable Securities and Long-term Investments
| | --- | -----------------------------------------------



Under ROC GAAP, marketable securities are carried at the lower of aggregate cost or market value. Under the US Statements of Financial Accounting
Standards (SFAS) No. 115, Accounting for Certain Investments in Debt and Equity Securities, debt and equity securities that have readily determinable fair values are to be classified as either trading, available-for-sale or
held-to-maturity securities. Debt securities that the Group has the positive intent and ability to hold to maturity are classified as held-to-maturity securities and reported at amortized cost. Debt and equity securities that are bought and traded
for short-term profit are classified as trading securities and reported at fair value, with unrealized gains and losses included in earnings. Debt and equity securities not classified as either held-to-maturity or trading securities are classified
as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of stockholders equity except for unrealized losses that are deemed to be other than
temporary which are charged to earnings.



The Group holds
marketable securities that are mainly classified as trading securities. The portion of trading gains and losses for the years ended December 31, 2002, 2003 and 2004 on trading securities still held at each of the respective balance sheet dates were
NT$1,771,439, NT$(1,305,269) and NT$(545,472), respectively.



The Group holds long-term investments in equity securities where the Group does not have the ability to exercise significant influence that are classified as available-for-sale securities. Information on sales of available-for-sale equity
securities for the years ended December 31, 2002, 2003 and 2004 are as follows:



|                                     |  |                    |  |                     |  |                     
|------------------------------------ |  | ------------------ |  | ------------------- |  | --------------------
|                                     |  | Proceeds fromsales |  | Gross realizedgains |  | Gross realizedlosses
|                                     |  | NT$000            |  | NT$000             |  | NT$000             
|For the year ended December 31, 2002 |  | 8,530,551          |  | 6,520,197           |  | 264                 
|For the year ended December 31, 2003 |  | 7,931,116          |  | 5,465,928           |  | 92,517              
|For the year ended December 31, 2004 |  | 17,663,280         |  | 11,972,460          |  | 15,431              



Information on
available-for-sale equity securities still held at each balance sheet date is as follows:



|                        |  |            |  |                        |  |                       |  |                              
|----------------------- |  | ---------- |  | ---------------------- |  | --------------------- |  | -----------------------------
|                        |  | Fair Value |  | Total unrealized gains |  | Totalunrealizedlosses |  | Net unrealized gains (losses)
|                        |  | NT$000    |  | NT$000                |  | NT$000               |  | NT$000                      
|As of December 31, 2002 |  | 35,127,937 |  | 19,322,091             |  | 574,484               |  | 18,747,607                   
|As of December 31, 2003 |  | 49,792,187 |  | 33,979,754             |  | 792,858               |  | 33,186,896                   
|As of December 31, 2004 |  | 27,432,594 |  | 19,490,852             |  | 25,926                |  | 19,464,926                   



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The Group did not transfer any available-for-sale securities to trading securities for the years
ended December 31, 2002, 2003 and 2004. The amount of gains reclassified from accumulated other comprehensive income into earnings on available-for-sale securities were NT$5,034,105, NT$3,036,738 and NT$10,790,505 for the years ended December 31,
2002, 2003 and 2004, respectively.



Under ROC GAAP, if an
investor company invests in equity securities that uses the cost method for valuation purposes, then an investor company shall recognize losses if evidence suggests that the value of an investment has been impaired and it is unlikely that the stock
price will recover. The new cost of the long-term investment is the book value after recognizing the losses. Under US GAAP, for individual securities classified as either available-for-sale or held-to-maturity, an enterprise shall determine whether
a decline in fair value below the cost or amortized cost basis is other than temporary. If the decline in fair value is judged to be other than temporary, the cost basis of the individual security shall be written down to fair value as a new cost
basis and the amount of the write-down shall be included in earnings. The new cost basis for held to maturity securities shall not be changed for subsequent recoveries in fair value. Subsequent increases in the fair value of available-for-sale
securities shall be included in the other comprehensive income.



The Group has written down NT$1,409 million, NT$1,866 million and NT$415 million under ROC GAAP against certain available-for-sale securities for the years ended December 31, 2002, 2003 and 2004. For US GAAP purposes, the Group further
wrote down an additional NT$781 million, nil and NT$3,050 million for the years ended December 31, 2002, 2003 and 2004, respectively. Among the NT$1,409 million and NT$1,866 million recognized under ROC GAAP for the years ended December 31, 2002 and
2003, NT$432 million and NT$781 million, respectively, had already been written down under US GAAP in the previous years, which therefore has led to an increase in net income under US GAAP for the years ended December 31, 2002 and 2003.



Under ROC GAAP, equity investments where an investor company has an
ownership interest of at least 20% are generally required to be accounted for under the equity method. However, when there is evidence indicating that the investor company does not have significant influence over the equity investee, despite an
ownership interest of 20% or more, the investor company should not account for the equity investee under equity method. On the contrary, when there is an evidence indicating that the investor company has significant influence over the equity
investees operating and financial policies, despite an ownership interest of less than 20%, the investor company will account for the equity investee under the equity method. Under US GAAP, the Group is required to use the equity method to
account for an investment in common stock when the investment in voting stock gives it the ability to exercise significant influence over operating and financial policies of an investee. An investment (direct or indirect) of 20% or more of the
voting stock of an investee leads to a presumption that in the absence of evidence to the contrary an investor has the ability to exercise significant influence over an investee.



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There were no significant differences between ROC GAAP and US GAAP on statements of operations for
the year ended December 31, 2002. Under ROC GAAP, when an investor companys ownership percentage of an investees outstanding common stock is the highest among shareholders, the investor company is considered to have significant influence
over the investee and equity accounting shall be applied, despite an ownership interest of less than 20%. However, under US GAAP, this does not qualify for a relationship of significant influence and hence equity accounting shall not be applied
unless the investor holds more than 20% of the voting rights. The difference between US GAAP and ROC GAAP in this area would result in a decrease in investment loss accounted for under the equity method of NT$465 million and NT$861 million and an
increase in unrealized gain on available-for-sale securities of NT$750 million and NT$148 million, for the year ended December 31, 2003 and 2004.



| | (4) | Treasury Stock and Gain on Disposal of Treasury Stock
| | --- | -----------------------------------------------------



Under ROC GAAP, when the Groups equity investee sells the Companys stock, it recognizes the gain or loss in its statement of operations. Under
US GAAP, the Groups equity in income (loss) of an investee is adjusted to eliminate the Companys proportionate share of any such gains or losses. Further, the Companys stock owned by an investee is proportionately deducted from the
investment as treasury stock.



| | (5) | Technological Know-how
| | --- | ----------------------



The Group entered into three joint ventures from 1995 through 1996. Both the Group and the joint venture partners contributed cash to the joint ventures.
In addition, the Group contributed technological know-how to the joint ventures for shares of the joint venture companies. Both parties mutually agreed to the value of this transferred technological know-how before the transfer of shares. The
technological know-how contributed has not been recognized on the Groups balance sheet, as these were internally generated intangible assets with no carrying value.



Under ROC GAAP, the Group recognized the cash contributed as the initial cost of the investment. The difference between the
proportionate share of the net assets in the joint venture and the cash contributed is amortized to income over the estimated useful life of the technological know-how, which is the source of this difference. Further, the joint venture recognized
value for the technological know-how as an intangible asset contributed, which is the cause of the difference between the proportionate share of the net assets and the cash contributed.



Under US GAAP, the investor initially records its joint venture investment at cost, representing the amount of cash
contributed and/or net book value of non-cash assets contributed. The joint venture normally records cash investments at the amount contributed, non-cash assets at fair value, and intangible assets at the predecessor basis, which is normally zero.
The joint venture does not recognize value for the technological know-how contributed, thus causing a difference from ROC GAAP.



This practice only applies to entities that are being consolidated or accounted for under the equity method.



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| | (6) | Convertible and Exchangeable Bonds
| | --- | ----------------------------------



Convertible Bonds



When convertible securities are issued, under ROC GAAP, the issuer does not recognize or account for any beneficial conversion feature embedded in the
securities. Under US GAAP, as prescribed in the Emerging Issues Task Force (EITF) Topic D-60, as amended by EITF 98-5, Accounting for the Issuance of Convertible Preferred Stock and Debt Securities with a Non-detachable Conversion
Feature, such beneficial conversion features should be recognized and measured by allocating a portion of the proceeds equal to the intrinsic value of that feature to capital reserve. That amount should be calculated at the issuance date as
the difference between the conversion price and the fair value of the common stock, multiplied by the number of shares into which the security is convertible (intrinsic value). As a result, a bond discount is recognized by allocating a portion of
the proceeds equal to the intrinsic value of that feature to capital reserve. The Group recognized interest expense of NT$1,274 million from February 1994, the date of issuance of the bonds, to May 1994, the date of first conversion, relating to a
NT$1.5 billion bond. The Group also recognized interest expense of NT$6,086 million from June 1994, the date of issuance of the bonds, to May 1996, the date of first conversion, relating to an US$160 million bond.



The Group recognized interest expense of approximately NT$800 million from
May 10, 2000, the date of issuance of the bonds, to June 1, 2000, the date of first conversion, related to its JPY 10 billion bond.



The Group recognized interest expense (revenue) of NT$570 million, NT$240 million and NT$(82) million for the years ended December 31, 2002, 2003 and
2004, respectively, relating to the US$302.4 million zero coupon convertible bonds issued on December 12, 2001.



When a subsidiary or investee (the Issuer) issues convertible bonds to other parties, including the parent or investor, and bonds are converted into
shares of the Issuer, the parents or investors ownership in the Issuer may decrease. On the other hand, the parents or investors ownership in the Issuer may increase upon conversion. Under ROC GAAP, this decrease or increase
is treated as a one-time decrease or increase to capital reserve and / or retained earnings.



Under US GAAP, a decrease in ownership is recognized as a gain or loss in the statement of operations upon the conversion, as long as the value of the proceeds can be objectively determined and the realization of the
gain is reasonably assured at the time of conversion. Under US GAAP, for the years ended December 31, 2002, 2003 and 2004, approximately NT$9.5 million, NT$70 million and NT$9 million were reclassified from capital reserve to a gain in the income
statement relating to these transactions.



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Further under US GAAP, an increase in ownership is treated as a purchase of additional shares and the
difference between the total cost of the investment and the proportionate share of the fair value net assets is first allocated to identifiable tangible and intangible assets and the remaining unallocated amounts to goodwill, which was amortized
over their respective estimated useful lives up to January 1, 2002. Upon the first adoption of the SFAS No.141, Business Combination and SFAS No.142, Goodwill and Other Intangible Assets by the Group on January 1, 2002,
goodwill created from acquisition is no longer to be amortized. Under US GAAP, for the year ended December 31, 2000, the Group capitalized goodwill of NT$468.3 million related to the conversion of a subsidiarys convertible bond, with NT$49.4
million and NT$93.7 million being amortized in the statement of operations for the years ended December 31, 2000 and 2001, respectively, and nil for the subsequent periods. Further, upon conversion of an equity investments bond, which
increased the Groups ownership, the difference of NT$519 million between the total cost of the investment and proportionate share of the fair value of net assets was being amortized over 5 years, which accounted for NT$54.8 million and
NT$103.9 million for the years ended December 31, 2000 and 2001, respectively. Again, due to the first adoption of SFAS No.141 & 142 on January 1, 2002, no amortization was made since then.



The Group has invested in convertible bonds. Under the SFAS No. 133,
Accounting for Derivative Instruments and Hedging Activities, an embedded derivative instrument shall be separated from the host contract and accounted for as a derivative instrument pursuant to the statement if a) the economic
characteristics and risks of the embedded derivative instrument are not clearly and closely related to the economic characteristics and risks of the host contract, b) the contract that embodies both the embedded derivative instrument and the host
contract is not remeasured at fair value with changes in fair value reported in earnings as they occur and c) a separate instrument with the same terms as the embedded derivative instrument would be a derivative instrument subject to the
requirements of SFAS No. 133. For available-for-sale convertible debt securities, the conversion option embedded must be separated from the debt host contract and accounted for as a derivative instrument provided that the conversion option would, as
a freestanding instrument, be a derivative instrument subject to the requirement of SFAS No. 133 since the embedded conversion option satisfied the above three criteria. As a result, the embedded option contracts in the convertible bonds with the
initial amount of NT$22 million, at the date of purchase were separated from the debt host contracts and were accounted for as trading securities reporting at fair value for the year ended December 31, 2003. Changes in fair value of such option
contracts still held at each of the respective balance sheet dates amounted to NT$(25) million and NT$2 million, respectively, which were included in earnings for the years ended December 31, 2002 and 2003, respectively. On the other hand, the debt
host contracts with the initial amount of NT$378 million in total were classified as available-for-sale securities as of December 31, 2003, with an unrealized gain of NT$46 million and NT$7 million reported in other comprehensive income for the
years ended December 31, 2002 and 2003, respectively.



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Exchangeable Bonds



Bonds that are exchangeable into common stock of a third party is an expansion on the concept of convertible bonds.



Under ROC GAAP, when exchangeable bondholders exercise their
rights to exchange for the reference shares, the book value of bonds is to be offset with the book value of the investment in the reference shares together with the related stockholders equity, with the difference recognized as gain or loss on
disposal of investments.



Under US GAAP, as prescribed by SFAS
No.133 and discussed above, the exchangeable feature within exchangeable bonds is an embedded equity derivative within a debt instrument that satisfies the three criteria which requires it to be bifurcated and separately accounted for. The fair
value of the exchangeable option feature of the Groups exchangeable bonds issued in May 2002 and July 2003 were measured as NT$2,025 million and NT$1,338 million, respectively, as at the date of issuance, which resulted in a reclassification
from the bond value to financial instrument liabilities. The difference between the bond face value and the amount attributed to the embedded derivative is amortized to interest expenses over the term to maturity of the bond instrument. As of
December 31, 2003 and 2004, the fair value of the options not yet exercised by the bondholders were NT$3,427 million and NT$126 million, respectively, resulting in a gain (loss) of NT$1,752 million, NT$(1,852) million and NT$(198) million being
recognized for the years ended December 31, 2002, 2003 and 2004, respectively.



| | (7) | Goodwill
| | --- | --------



Under ROC GAAP, the fair value of the net assets received is deemed to be the value of the consideration for the acquisition of the remaining interests in
United Semiconductor, United Silicon, UTEK Semiconductor and United Integrated Circuits in January 2000. Under ROC GAAP, the acquisition cost of the merger with SiSMC was determined using the average market price of the shares exchanged over one
month before the effective date, which represented the reasonable market price of the net assets merged from SiSMC. Under US GAAP, EITF No. 99-12 requires that the securities exchanged should be valued based on the market prices a few days before
and after the date when the terms of the acquisition are agreed to and announced. Under US GAAP, the acquisition was accounted for using the purchase method of accounting and the purchase price was determined using the market value of the shares
exchanged. The difference between the fair value of the shares exchanged and the fair value of the net assets acquired created goodwill. Upon the adoption of SFAS No.141 & 142 on January 1, 2002 by the Group, the goodwill ceased to be amortized
and is subject to an annual impairment test or when events and circumstances indicate a possible impairment may exist. The Company has determined that it has one reporting unit to which goodwill is assigned and is tested for impairment pursuant to
SFAS No. 142. Goodwill impairment was tested in the fourth quarter and the fair value of the reporting unit is determined using the companys quoted stock price. Due to a decline in stock price, the Company recognized a goodwill impairment
charge of NT$31,720 million as of December 31, 2004 (2003  NT$nil; 2002  NT$nil).



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| | (8) | Earnings per Share
| | --- | ------------------



Under ROC GAAP, basic earnings per share are calculated by dividing net income by the weighted average number of shares outstanding during the year.
Diluted earnings per share are calculated by taking basic earnings per share into consideration plus additional common shares that would have been outstanding if the dilutive share equivalents had been issued. The net income would also be adjusted
for the interest and other income or expenses derived from any underlying dilutive share equivalents. The weighted average shares outstanding are adjusted retroactively for stock dividends issued and shares issued for employees bonus, as
described under (1) Compensation above.



Under US GAAP, basic
earnings per share are calculated by dividing net income by the weighted average number of shares outstanding during the year. Shares issued for employees bonus will affect the current years earnings per share only. Diluted earnings per
share are calculated by taking into consideration additional common shares that would have been outstanding if the dilutive share equivalents had been issued. The net income would also be adjusted for the interest and other income or expenses
derived from any underlying dilutive share equivalents.



| | (9) | Tax Effect of US GAAP Adjustments
| | --- | ---------------------------------



Undistributed earnings generated after 1997 are subject to a 10% tax in compliance with the Income Tax Law of the ROC. Under ROC GAAP, the 10% tax on
undistributed earnings is recorded as an expense at the time shareholders resolve that its earnings shall be retained. Under US GAAP, the Group would measure its income tax expense, including the tax effects of temporary differences, using the tax
rate that includes the tax on undistributed earnings.



| | (10) | Principles of Consolidation
| | ---- | ---------------------------



Under ROC GAAP, certain majority-owned (above 50%) subsidiaries are not consolidated if they meet specific exclusion rules detailed in the accounting
policies footnote. Under US GAAP, consolidation is generally required when one of the companies in a group directly or indirectly has a controlling financial interest in the other companies. The usual condition for controlling financial interest is
ownership of a majority of the voting interest and, therefore, as a general rule, ownership by one company, directly or indirectly, of over fifty percent of the outstanding voting shares of another company is a condition pointing towards
consolidation. Consolidation of majority-owned subsidiaries is required in the preparation of consolidated financial statements, unless (i) control is considered temporary or (ii) control does not rest with the majority owner. As such, under US
GAAP, the Company consolidates those subsidiaries that are excluded from consolidation under ROC GAAP due to the exclusion rules (Fortune Venture Capital Corporation, Unitruth Investment Corp., UMC Capital Corporation, United Microelectronics Corp.
(Samoa), and United Foundry Service, Inc.) The net income and stockholders equity variances between US GAAP and ROC GAAP for those entities are included in the adjustment for equity investments.



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (11) | Stock Dividends
| | ---- | ---------------



Under ROC GAAP, stock dividends are recorded at a par value with a charge to retained earnings. Under US GAAP, if the ratio of distribution is less than
25 percent of the same class of shares outstanding, the fair value of the shares issued should be charged to retained earnings. The accumulative effect of these dividends would have decreased retained earnings and increased capital reserve for the
years ended December 31, 2003, and 2004 by approximately NT$251,384 million and NT$270,651 million, respectively.



| | (12) | Other financial assets
| | ---- | ----------------------



Interest rate swap



To eliminate the variability of cash flows in the interest payments of its NT$15 billion variable-rate domestic bonds issued in May to June 2003, the
Company entered into interest rate swap agreements with notional amount of NT$15 billion that effectively convert the floating-rate domestic bonds to a fixed-rate basis over the term of the bonds. Under ROC GAAP, the periodic cash settlement under
the interest rate swap is accrued in the statement of operations as an adjustment to interest expense. The net receivable or payable under the interest rate swap is included as other financial assets. Changes in fair value of the
interest rate swap, as hedging instrument, are not required to be accounted for as of the balance sheet date.



Under US GAAP, the SFAS No. 133 requires companies to recognize all of its derivative instruments as either assets or liabilities in the statement of
financial position at fair value. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. For
those derivative instruments that are designated and qualify as hedging instruments, a company must designate the hedging instrument, based upon the exposure being hedged, as a fair value hedge, cash flow hedge or a hedge of a net investment in a
foreign operation.



The Companys interest rate swap
agreements were designated as cash flow hedges. For derivative instruments that are designated and qualify as a cash flow hedge to hedge the exposure to variability in expected future cash flows that is attributable to a particular risk, the
effective portion of the gain or loss on the derivative instrument is reported as other comprehensive income, a component of stockholders equity, and reclassified into earnings in the same period or periods during which the hedged transaction
affects earnings. Therefore, to recognize the change in fair value of the interest rate swaps, an amount of NT$(19) million and NT$(397) million was included in other comprehensive income under US GAAP for the years ended December 31, 2003 and 2004,
respectively.



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Credit-linked deposits and repackage bonds



The Group held credit-linked deposits and repackage bonds classified as
other financial assets under ROC GAAP as of December 31, 2003 and 2004. As no early withdrawal is allowed under the deposits or repackage bonds agreements, such financial instruments are included in held-to-maturity securities under US GAAP.



The repayment in full, including any accrued interest, of
these deposits and repackage bonds is subject to the non-occurrence of one or more credit events, which are referenced to the entities fulfillment of their own obligations as well as repayment of their loan or corporate bonds. Upon the
occurrence of one or more of such credit events, the Group may receive nil or less than the full amount of these deposits and any payment received may be delayed due to the occurrence of certain events.



The credit-linked deposits embody embedded derivatives which meet the
criteria for separate accounting under SFAS No. 133; therefore, these credit-linked deposits were bifurcated into their underlying instruments (deposits and repackage bonds) and the embedded derivative financial instruments whose fair value was
determined to be NT$52 million and NT$33 million as of December 31, 2003 and 2004, respectively.



| | (13) | Gross Profit and Operating Income
| | ---- | ---------------------------------



Inventory loss provision, gain and losses from disposal of property, plant and equipment, and gain and losses from foreign currency exchange were
presented below the operating income subtotal in the statement of operations as permitted under ROC GAAP. Under US GAAP, the inventory loss provision is included in the determination of gross profit. Further, the inventory loss provision, gain from
disposal of property, plant and equipment, and gain from foreign currency exchange are included in the determination of operating income.



| | (14) | Gain on Disposal of Fixed Assets
| | ---- | --------------------------------



Under ROC GAAP, gains and losses from the disposal of fixed assets were both recognized in the statement of operations, with gains reclassified from
retained earnings to capital reserve. However, according to the amendments of the Company Law of ROC, such transfer of gains to capital reserve shall no longer be required effective from January 1, 2001. The accumulated gain transferred in prior
years can be transferred back from the capital reserve and be treated as a one-time increase in retained earnings subject to the shareholders approval. Under US GAAP, the reclassification of the gain from retained earnings is not permitted. As
of December 31, 2004, the accumulated gain transferred in prior years by investees that has not been transferred back from capital reserve under ROC GAAP amounted to NT$1.7 million.



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



| | (15) | Reclassification of Time Deposits
| | ---- | ---------------------------------



Under ROC GAAP, cash and cash equivalents include time deposits. Under US GAAP, cash equivalents are short-term, highly liquid investments that are
readily convertible to cash with original maturities of 3 months or less. Thus, time deposits with original maturities of more than 3 months are classified as cash equivalents under ROC GAAP but should be included in marketable securities for
trading purpose under US GAAP.



| | (16) | Employee Stock Options
| | ---- | ----------------------



The Group has elected to follow Accounting Principles Board Opinion No. 25, Accounting for Stock Issued to Employees (APB 25) and related
interpretations in accounting for its employee stock options because, as discussed below, the alternative fair value accounting provided for under SFAS No. 123, Accounting for Stock-Based Compensation, requires use of option valuation
models that were not developed for use in valuing employee stock options. Under APB 25, because the exercise price of the Companys employee stock options equals the market price of the underlying stock on the date of grant, no compensation
expense is recognized for the Company.



On September 11, 2002,
October 8, 2003, and September 30, 2004, the Company was authorized to issue Employee Stock Options. The total number of options to be granted under these three plans is 1.3 billion units, with each unit entitling the optionee to subscribe to 1
share of the Companys common stock. The grant period for options is 6 years and an optionee may exercise his/her options starting from 2 years after the grant: employees may exercise up to 50% of the options after 2 years, up to 75% after 3
years and up to 100% after 4 years. The total number of option units outstanding as of December 31, 2004, was 973,858 thousand units.



Pro forma information regarding net income and earnings per share is required by SFAS No. 123, and has been determined as if the Group had accounted for
its employee stock options under the fair value method of that Statement. The fair value for these options was estimated at the date of grant using a Black-Scholes option pricing model with the following weighted-average assumptions for the years
ended December 31, 2002, 2003 and 2004, respectively: risk-free interest rate of 1.98%, 2.40% and 2.75%; dividend yields of 22.63%, 17.24% and 11.40%; volatility factors of the expected market price of the Companys common stock of 0.54, 0.52
and 0.49; and a weighted-average expected life of the option of 4.4 years.



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS





The Black-Scholes
option valuation model was developed for use in estimating the fair value of traded options which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions
including the expected stock price volatility. Because the Groups employee stock options have characteristics significantly different from those of traded options, and because changes in the subjective input assumptions can materially affect
the fair value estimate, in managements opinion, the existing models do not necessarily provide a reliable single measure of the fair value of its employee stock options.



For purposes of pro forma disclosures, the estimated fair value of the options is amortized to expense over the
options vesting period. The Groups pro forma information follows (in thousands except for earnings per share information):



|                                                                                                                                            |  |                                 |   |  |            |   |  |            |   |  |          |  
|------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------- | - |  | ---------- | - |  | ---------- | - |  | -------- | -
|                                                                                                                                            |  | For the year ended December 31, |  
|                                                                                                                                            |  | 2002                            |   |  | 2003       |   |  | 2004       |  
|                                                                                                                                            |  | NT$000                         |   |  | NT$000    |   |  | NT$000    |   |  | US$000  |  
|Net income, as reported under US GAAP                                                                                                       |  | 293,653                         |   |  | 10,475,911 |   |  | (4,748,690 | ) |  | (149,612 | )
|Add: Stock-based employee compensation expense included in reported net income, net of related tax effects                                  |  | 5,387                           |   |  | 87,291     |   |  | (89,753    | ) |  | (2,828   | )
|Deduct: Total stock-based employee compensation expense determined under fair value based method for all awards, net of related tax
effects |  | (398,583                        | ) |  | (250,082   | ) |  | (535,494   | ) |  | (16,871  | )
|                                                                                                                                            |  |                                 |   |  |            |   |  |            |   |  |          |  
|Pro forma net income                                                                                                                        |  | (99,543                         | ) |  | 10,313,120 |   |  | (5,373,937 | ) |  | (169,311 | )
|                                                                                                                                            |  |                                 |   |  |            |   |  |            |   |  |          |  
|                                                                                                                                            | 
|                                                                                                                                            |  | For the year ended December 31, |  
|                                                                                                                                            |  | 2002                            |   |  | 2003       |   |  | 2004       |  
|Basic earnings (loss) per share (in dollars):                                                                                               |  |                                 |   |  |            |   |  |            |   |  |          |  
|- as reported                                                                                                                               |  | 0.02                            |   |  | 0.63       |   |  | (0.28      | ) |  | (0.01    | )
|                                                                                                                                            |  |                                 |   |  |            |   |  |            |   |  |          |  
|- pro forma                                                                                                                                 |  | (0.01                           | ) |  | 0.62       |   |  | (0.32      | ) |  | (0.01    | )
|                                                                                                                                            |  |                                 |   |  |            |   |  |            |   |  |          |  
|Diluted earnings (loss) per shares (in dollars)                                                                                             |  |                                 |   |  |            |   |  |            |   |  |          |  
|- as reported                                                                                                                               |  | 0.02                            |   |  | 0.62       |   |  | (0.28      | ) |  | (0.01    | )
|                                                                                                                                            |  |                                 |   |  |            |   |  |            |   |  |          |  
|- pro forma                                                                                                                                 |  | (0.01                           | ) |  | 0.61       |   |  | (0.31      | ) |  | (0.01    | )
|                                                                                                                                            |  |                                 |   |  |            |   |  |            |   |  |          |  



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



The pro forma net income effect for the periods prior to September 2002 is mainly attributable to the
employee stock options issued by a subsidiary of the Company.



A summary of the Companys stock option activity, and related information for the years ended December 31, 2003 and 2004 are as follows:



|                                                               |  |                                 |         |      |                                 |      |                       |     |         |                                 |  |     
|-------------------------------------------------------------- |  | ------------------------------- | ------- | ---- | ------------------------------- | ---- | --------------------- | --- | ------- | ------------------------------- |  | ----
|                                                               |  | For the year ended December 31,
|                                                               |  | 2003                            |         | 2004
|                                                               |  | Options(in thousands)           |         |      | Weighted- Average ExercisePrice |      | Options(in thousands) |     |         | Weighted- Average ExercisePrice
|                                                               |  |                                 |         |      | NT$                             |      |                       |     |         | NT$                            
|Outstanding-beginning of year                                  |  |                                 | 928,059 |      |                                 | 17.7 |                       |     | 980,664 |                                 |  | 18.4
|Granted                                                        |  |                                 | 118,330 |      |                                 | 23.7 |                       |     | 110,120 |                                 |  | 23.4
|Exercised                                                      |  |                                 |        |      |                                 |     |                       |     | (44,138 | )                               |  | 17.7
|Forfeited                                                      |  |                                 | (65,725 | )    |                                 | 18.4 |                       |     | (72,788 | )                               |  | 19.3
|                                                               |  |                                 |         |      |                                 |      |                       |     |         |                                 |  |     
|Outstanding-end of year                                        |  |                                 | 980,664 |      |                                 | 18.4 |                       |     | 973,858 |                                 |  | 18.9
|                                                               |  |                                 |         |      |                                 |      |                       |     |         |                                 |  |     
|Exercisable at end of year                                     |  |                                 |        |      |                                 |      |                       |     | 368,896 |                                 |  |     
|Weighted-average fair value of options granted during the year |  | NT$                             | 3.0     |      |                                 |      |                       | NT$ | 3.8     |                                 |  |     



Exercise prices for
options outstanding as of December 31, 2004 range from NT$17.7 to NT$27.8. The weighted-average remaining contractual life of those options is 2.4 years.



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Reconciliation of Consolidated Net Income



|                                                                     |  |                                 |   |  |            |   |  |             |   |  |            |  
|-------------------------------------------------------------------- |  | ------------------------------- | - |  | ---------- | - |  | ----------- | - |  | ---------- | -
|                                                                     |  | For the year ended December 31, |  
|                                                                     |  | 2002                            |   |  | 2003       |   |  | 2004        |  
|                                                                     |  | NT$000                         |   |  | NT$000    |   |  | NT$000     |   |  | US$000    |  
|Net income, ROC GAAP                                                 |  | 7,072,032                       |   |  | 14,020,257 |   |  | 31,843,381  |   |  | 1,003,257  |  
|US GAAP adjustments:                                                 |  |                                 |   |  |            |   |  |             |   |  |            |  
|(1) Compensation                                                     |  | (7,348,917                      | ) |  | (2,914,994 | ) |  | (3,540,050  | ) |  | (111,533   | )
|(2) Equity investments:                                              |  |                                 |   |  |            |   |  |             |   |  |            |  
|(1) Compensation                                                     |  | (471,136                        | ) |  | (421,133   | ) |  | (370,881    | ) |  | (11,685    | )
|(3) Marketable securities                                            |  | (64,049                         | ) |  | 6,429      |   |  | 2,550       |   |  | 80         |  
|(5) Technological know-how                                           |  | 22,527                          |   |  | 21,664     |   |  | 10,751      |   |  | 339        |  
|Others                                                               |  | (85,114                         | ) |  | (138,745   | ) |  | (413,743    | ) |  | (13,035    | )
|(3) Investment income (losses)                                       |  | 30,206                          |   |  | 504,386    |   |  | (483,461    | ) |  | (15,232    | )
|(3) Difference in application of equity accounting                   |  |                                |   |  | 464,555    |   |  | 861,303     |   |  | 27,136     |  
|(3) Impairment loss in marketable securities                         |  | (348,906                        | ) |  | 1,477,618  |   |  | (3,050,065  | ) |  | (96,095    | )
|(6) Adjustments due to change in interest of investee companies      |  | 449,365                         |   |  | (278,721   | ) |  | (37,966     | ) |  | (1,196     | )
|(6) Embedded derivatives in exchangeable bonds                       |  | 1,752,039                       |   |  | (1,852,268 | ) |  | 817,959     |   |  | 25,771     |  
|(6) Convertible/Exchangeable bonds                                   |  | (691,394                        | ) |  | (725,225   | ) |  | 226,457     |   |  | 7,135      |  
|(6) Gain on reacquisition of bonds                                   |  |                                |   |  | 106,416    |   |  | 600,466     |   |  | 18,918     |  
|(7) Amortization of goodwill arising from merger with SiSMC          |  |                                |   |  |           |   |  | 21,206      |   |  | 668        |  
|(7) Impairment loss on goodwill                                      |  |                                |   |  |           |   |  | (31,719,607 | ) |  | (999,357   | )
|(9) Income tax effect                                                |  | (23,000                         | ) |  | 242,000    |   |  | 493,595     |   |  | 15,551     |  
|(12)Credit-linked deposits / repackage bonds                         |  |                                |   |  | (36,328    | ) |  | (10,585     | ) |  | (334       | )
|                                                                     |  |                                 |   |  |            |   |  |             |   |  |            |  
|Net income (losses), US GAAP                                         |  | 293,653                         |   |  | 10,475,911 |   |  | (4,748,690  | ) |  | (149,612   | )
|                                                                     |  |                                 |   |  |            |   |  |             |   |  |            |  
|(8) Basic earnings (losses) per share under US GAAP (in dollars)     |  | 0.02                            |   |  | 0.63       |   |  | (0.28       | ) |  | (0.01      | )
|                                                                     |  |                                 |   |  |            |   |  |             |   |  |            |  
|(8) Diluted earnings (losses) per share under US GAAP (in dollars)   |  | 0.02                            |   |  | 0.62       |   |  | (0.28       | ) |  | (0.01      | )
|                                                                     |  |                                 |   |  |            |   |  |             |   |  |            |  
|Weighted-average number of shares outstanding-basic (in thousands)   |  | 16,462,356                      |   |  | 16,504,764 |   |  | 16,773,337  |   |  | 16,773,337 |  
|                                                                     |  |                                 |   |  |            |   |  |             |   |  |            |  
|Weighted-average number of shares outstanding-diluted (in thousands) |  | 16,545,414                      |   |  | 16,890,876 |   |  | 17,052,732  |   |  | 17,052,732 |  
|                                                                     |  |                                 |   |  |            |   |  |             |   |  |            |  



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Reconciliation of Other Comprehensive Income



|                                                              |  |                                 |   |  |            |   |  |             |   |  |           |  
|------------------------------------------------------------- |  | ------------------------------- | - |  | ---------- | - |  | ----------- | - |  | --------- | -
|                                                              |  | For the year ended December 31, |  
|                                                              |  | 2002                            |   |  | 2003       |   |  | 2004        |  
|                                                              |  | NT$000                         |   |  | NT$000    |   |  | NT$000     |   |  | US$000   |  
|Other comprehensive (loss) income, ROC GAAP                   |  | (620,397                        | ) |  | 823,013    |   |  | (1,744,165  | ) |  | (54,952   | )
|(3) Marketable securities-available for sale                  |  | 20,147,099                      |   |  | 33,356,195 |   |  | 19,862,641  |   |  | 625,792   |  
|(2) Translation adjustments                                   |  | (478                            | ) |  | 1,748      |   |  | 8,125       |   |  | 256       |  
|(12) Interest rate swaps                                      |  |                                |   |  | (18,882    | ) |  | (416,149    | ) |  | (13,111   | )
|                                                              |  |                                 |   |  |            |   |  |             |   |  |           |  
|Other comprehensive income, US GAAP                           |  | 19,526,224                      |   |  | 34,162,074 |   |  | 17,710,452  |   |  | 557,985   |  
|                                                              |  |                                 |   |  |            |   |  |             |   |  |           |  
|                                                              | 
|Reconciliation of Gross Profits                               |  |                                 |  
|                                                              | 
|                                                              |  | For the year ended December 31, |  
|                                                              |  | 2002                            |   |  | 2003       |   |  | 2004        |  
|                                                              |  | NT$000                         |   |  | NT$000    |   |  | NT$000     |   |  | US$000   |  
|Gross profit, ROC GAAP                                        |  | 12,538,054                      |   |  | 21,765,919 |   |  | 36,798,425  |   |  | 1,159,371 |  
|(1) Compensation                                              |  | (5,415,162                      | ) |  | (2,194,222 | ) |  | (2,658,138  | ) |  | (83,747   | )
|(10) Consolidation of unconsolidated subsidiaries             |  |                                |   |  | 102,382    |   |  | 199,931     |   |  | 6,299     |  
|(13) Inventory loss provision                                 |  | (955,074                        | ) |  | (1,443,565 | ) |  | (1,884,466  | ) |  | (59,372   | )
|                                                              |  |                                 |   |  |            |   |  |             |   |  |           |  
|Gross profit, US GAAP                                         |  | 6,167,818                       |   |  | 18,230,514 |   |  | 32,455,752  |   |  | 1,022,551 |  
|                                                              |  |                                 |   |  |            |   |  |             |   |  |           |  
|                                                              | 
|Reconciliation of Operating (Loss) Income                     |  |                                 |  
|                                                              | 
|                                                              |  | For the year ended December 31, |  
|                                                              |  | 2002                            |   |  | 2003       |   |  | 2004        |  
|                                                              |  | NT$000                         |   |  | NT$000    |   |  | NT$000     |   |  | US$000   |  
|Operating income, ROC GAAP                                    |  | 112,258                         |   |  | 9,739,927  |   |  | 21,806,397  |   |  | 687,032   |  
|(1) Compensation                                              |  | (7,348,917                      | ) |  | (2,914,994 | ) |  | (3,540,050  | ) |  | (111,533  | )
|(7) Amortization of goodwill arising from merger with SiSMC   |  |                                |   |  |           |   |  | 21,206      |   |  | 668       |  
|(7) Impairment loss on goodwill                               |  |                                |   |  |           |   |  | (31,719,607 | ) |  | (999,358  | )
|(10)Consolidation of unconsolidated subsidiaries              |  | (24,890                         | ) |  | (40,931    | ) |  | (58,227     | ) |  | (1,834    | )
|(13) Inventory loss provision                                 |  | (955,074                        | ) |  | (1,443,565 | ) |  | (1,884,466  | ) |  | (59,372   | )
|(13) Foreign currency exchange gain (loss)                    |  | (104,243                        | ) |  | 171,973    |   |  | (968,350    | ) |  | (30,509   | )
|(14) Gain (loss) on disposal of property, plant and equipment |  | 14,403                          |   |  | 46,268     |   |  | (90,658     | ) |  | (2,856    | )
|                                                              |  |                                 |   |  |            |   |  |             |   |  |           |  
|Operating (loss) income, US GAAP                              |  | (8,306,463                      | ) |  | 5,558,678  |   |  | (16,433,755 | ) |  | (517,762  | )
|                                                              |  |                                 |   |  |            |   |  |             |   |  |           |  



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##### Table of Contents

UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Reconciliation of Consolidated Stockholders Equity



|                                                                |  |                    |   |  |             |   |  |            |  
|--------------------------------------------------------------- |  | ------------------ | - |  | ----------- | - |  | ---------- | -
|                                                                |  | As of December 31, |  
|                                                                |  | 2003               |   |  | 2004        |  
|                                                                |  | NT$000            |   |  | NT$000     |   |  | US$000    |  
|Total stockholders equity, ROC GAAP                            |  | 232,233,046        |   |  | 266,373,876 |   |  | 8,392,371  |  
|(1) Compensation                                                |  | 129,156            |   |  | 153,722     |   |  | 4,843      |  
|(2) Equity investments:                                         |  |                    |   |  |             |   |  |            |  
|(1) Compensation                                                |  | (150,524           | ) |  | (189,123    | ) |  | (5,958     | )
|(3) Marketable securities - trading                             |  | 31,563             |   |  | 32,800      |   |  | 1,033      |  
|(3) Marketable securities - available for sale                  |  | 951,500            |   |  | 1,067,865   |   |  | 33,644     |  
|(5) Technological know-how                                      |  | (14,972            | ) |  | (4,159      | ) |  | (131       | )
|Translation adjustments                                         |  | 1,042              |   |  | 154         |   |  | 5          |  
|Others                                                          |  | (344,210           | ) |  | 554,596     |   |  | 17,473     |  
|(3) Change in fair value of marketable securities               |  | 32,968,417         |   |  | 18,718,179  |   |  | 589,735    |  
|(3) Difference in application of equity accounting              |  | 396,777            |   |  | 1,458,562   |   |  | 45,953     |  
|(3) Impairment loss on marketable securities                    |  | (2,176,217         | ) |  | (5,226,282  | ) |  | (164,659   | )
|(4) Treasury stock                                              |  | (3,372             | ) |  | (2,169      | ) |  | (68        | )
|(6) Adjustments due to change in interest of investee companies |  | 1,652,828          |   |  | 1,527,584   |   |  | 48,128     |  
|(6) Convertible / Exchangeable bonds                            |  | (1,310,203         | ) |  | (483,280    | ) |  | (15,226    | )
|(6) Embedded derivatives in exchangeable bonds                  |  | (100,229           | ) |  | 717,730     |   |  | 22,613     |  
|(7) Unamortized goodwill due to acquisition                     |  | 98,268,000         |   |  | 98,268,000  |   |  | 3,096,030  |  
|(7) Impairment loss on goodwill                                 |  |                   |   |  | (31,719,607 | ) |  | (999,357   | )
|(7) Difference arising from merger with SiSMC                   |  |                   |   |  | (840,079    | ) |  | (26,468    | )
|(9) Income tax effect                                           |  | (81,000            | ) |  | 412,595     |   |  | 12,999     |  
|(12) Credit-linked deposits / repackage bonds                   |  | (36,328            | ) |  | (46,912     | ) |  | (1,478     | )
|(12) Interest rate swaps                                        |  | (18,882            | ) |  | (416,149    | ) |  | (13,111    | )
|                                                                |  |                    |   |  |             |   |  |            |  
|Stockholders equity, US GAAP                                   |  | 362,396,392        |   |  | 350,357,903 |   |  | 11,038,371 |  
|                                                                |  |                    |   |  |             |   |  |            |  



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Movements in Stockholders Equity in Accordance with US GAAP



|                                                                                              |  |                                 |   |  |             |   |  |             |   |  |            |  
|--------------------------------------------------------------------------------------------- |  | ------------------------------- | - |  | ----------- | - |  | ----------- | - |  | ---------- | -
|                                                                                              |  | For the year ended December 31, |  
|                                                                                              |  | 2002                            |   |  | 2003        |   |  | 2004        |  
|                                                                                              |  | NT$000                         |   |  | NT$000     |   |  | NT$000     |   |  | US$000    |  
|Balance at January 1,                                                                         |  | 349,492,233                     |   |  | 334,024,817 |   |  | 362,396,392 |   |  | 11,417,656 |  
|(1) Compensation                                                                              |  | 7,415,890                       |   |  | 2,971,527   |   |  | 3,551,998   |   |  | 111,909    |  
|(2) Adjustment of capital reserve and retained earnings accounted for under the equity method |  | 197,989                         |   |  | 535,183     |   |  | 1,613,750   |   |  | 50,843     |  
|(2) Cumulative translation adjustment on foreign long-term investment                         |  | 829,758                         |   |  | 187,252     |   |  | (2,226,952  | ) |  | (70,163    | )
|(3) Change in fair value of marketable securities  the Company                               |  | (20,936,211                     | ) |  | 13,846,828  |   |  | (13,766,778 | ) |  | (433,736   | )
|(3) Change in fair value of marketable securities  equity investees                          |  | (545,915                        | ) |  | 620,652     |   |  | (60,625     | ) |  | (1,910     | )
|(6) Adjustment due to change in ownership of investee companies                               |  | 20,981                          |   |  | (1,403,074  | ) |  | (406,216    | ) |  | (12,798    | )
|(4) Treasury stock                                                                            |  | (2,743,561                      | ) |  | 1,156,178   |   |  | (5,196,817  | ) |  | (163,731   | )
|Shares issued for merger with SiSMC                                                           |  |                                |   |  |            |   |  | 8,810,715   |   |  | 277,590    |  
|Exercise of employees stock options                                                          |  |                                |   |  |            |   |  | 788,393     |   |  | 24,839     |  
|(12) Interest rate swaps                                                                      |  |                                |   |  | (18,882     | ) |  | (397,267    | ) |  | (12,516    | )
|Net income (losses)                                                                           |  | 293,653                         |   |  | 10,475,911  |   |  | (4,748,690  | ) |  | (149,612   | )
|                                                                                              |  |                                 |   |  |             |   |  |             |   |  |            |  
|Balance at end of year                                                                        |  | 334,024,817                     |   |  | 362,396,392 |   |  | 350,357,903 |   |  | 11,038,371 |  
|                                                                                              |  |                                 |   |  |             |   |  |             |   |  |            |  



Summarized US GAAP balance sheet and
statement of operations information is presented below:



|                        |  |                    |  |             |  |           
|----------------------- |  | ------------------ |  | ----------- |  | ----------
|                        |  | As of December 31,
|                        |  | 2003               |  | 2004       
|                        |  | NT$000            |  | NT$000     |  | US$000   
|Current assets          |  | 152,900,376        |  | 133,210,887 |  | 4,196,940 
|Non-current assets      |  | 333,459,239        |  | 327,110,931 |  | 10,305,953
|Current liabilities     |  | 48,344,286         |  | 37,030,673  |  | 1,166,688 
|Non-current liabilities |  | 60,580,688         |  | 64,322,988  |  | 2,026,559 
|Minority interests      |  | 15,038,249         |  | 8,610,254   |  | 271,275   



|                        |  |                                 |   |  |             |   |  |             |   |  |            |  
|----------------------- |  | ------------------------------- | - |  | ----------- | - |  | ----------- | - |  | ---------- | -
|                        |  | For the year ended December 31, |  
|                        |  | 2002                            |   |  | 2003        |   |  | 2004        |  
|                        |  | NT$000                         |   |  | NT$000     |   |  | NT$000     |   |  | US$000    |  
|Net operating revenues  |  | 75,425,356                      |   |  | 95,703,732  |   |  | 129,190,740 |   |  | 4,070,281  |  
|Cost of goods sold      |  | (69,257,538                     | ) |  | (77,473,218 | ) |  | (96,734,988 | ) |  | (3,047,731 | )
|Operating (loss) income |  | (8,306,463                      | ) |  | 5,558,678   |   |  | (16,433,755 | ) |  | (517,762   | )
|Net income              |  | 293,653                         |   |  | 10,475,911  |   |  | (4,748,690  | ) |  | (149,612   | )



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



A reconciliation of the significant balance sheet accounts under ROC GAAP to the amounts determined under US GAAP is
as follows:



|                                                              |  |                    |   |  |             |   |  |            |  
|------------------------------------------------------------- |  | ------------------ | - |  | ----------- | - |  | ---------- | -
|                                                              |  | As of December 31, |  
|                                                              |  | 2003               |   |  | 2004        |  
|                                                              |  | NT$000            |   |  | NT$000     |   |  | US$000    |  
|Cash and Cash Equivalents:                                    |  |                    |   |  |             |   |  |            |  
|As reported under ROC GAAP                                    |  | 118,771,773        |   |  | 101,381,973 |   |  | 3,194,139  |  
|Consolidation of unconsolidated subsidiaries                  |  | 847,185            |   |  | 746,017     |   |  | 23,504     |  
|Reclassification to marketable securities                     |  | (30,422,651        | ) |  | (46,570,371 | ) |  | (1,467,245 | )
|                                                              |  |                    |   |  |             |   |  |            |  
|As adjusted under US GAAP                                     |  | 89,196,307         |   |  | 55,557,619  |   |  | 1,750,398  |  
|                                                              |  |                    |   |  |             |   |  |            |  
|Marketable Securities, trading:                               |  |                    |   |  |             |   |  |            |  
|Reported as marketable securities under ROC GAAP              |  | 1,820,328          |   |  | 3,143,697   |   |  | 99,045     |  
|Reclassification from cash & cash equivalents                 |  | 30,422,651         |   |  | 46,570,371  |   |  | 1,467,246  |  
|Reclassification to marketable securities, available-for-sale |  | (21,198            | ) |  |            |   |  |           |  
|Credit-linked options                                         |  | 52,435             |   |  | 32,642      |   |  | 1,028      |  
|Change in fair value of marketable securities                 |  | 550,014            |   |  | 66,554      |   |  | 2,097      |  
|                                                              |  |                    |   |  |             |   |  |            |  
|As adjusted under US GAAP                                     |  | 32,824,230         |   |  | 49,813,264  |   |  | 1,569,416  |  
|                                                              |  |                    |   |  |             |   |  |            |  
|Represented by:                                               |  |                    |   |  |             |   |  |            |  
|Trading securities - current                                  |  | 32,147,383         |   |  | 49,813,264  |   |  | 1,569,416  |  
|Trading securities - noncurrent                               |  | 676,847            |   |  |            |   |  |           |  
|                                                              |  |                    |   |  |             |   |  |            |  
|                                                              |  | 32,824,230         |   |  | 49,813,264  |   |  | 1,569,416  |  
|                                                              |  |                    |   |  |             |   |  |            |  
|                                                              | 
|                                                              |  | As of December 31, |  
|                                                              |  | 2003               |   |  | 2004        |  
|                                                              |  | NT$000            |   |  | NT$000     |   |  | US$000    |  
|Other Financial Assets, Current:                              |  |                    |   |  |             |   |  |            |  
|As reported under ROC GAAP                                    |  | 2,446,603          |   |  | 453,845     |   |  | 14,299     |  
|Reclassification to marketable securities, held-to-maturity   |  | (2,318,064         | ) |  | (379,680    | ) |  | (11,962    | )
|Interest rate swaps                                           |  | (18,882            | ) |  | (416,149    | ) |  | (13,111    | )
|                                                              |  |                    |   |  |             |   |  |            |  
|As adjusted under US GAAP                                     |  | 109,657            |   |  | (341,984    | ) |  | (10,774    | )
|                                                              |  |                    |   |  |             |   |  |            |  



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



|                                                            |  |                    |   |  |            |   |  |           |  
|----------------------------------------------------------- |  | ------------------ | - |  | ---------- | - |  | --------- | -
|                                                            |  | As of December 31, |  
|                                                            |  | 2003               |   |  | 2004       |  
|                                                            |  | NT$000            |   |  | NT$000    |   |  | US$000   |  
|Long-term Investments:                                      |  |                    |   |  |            |   |  |           |  
|As reported under ROC GAAP                                  |  | 38,919,249         |   |  | 32,712,278 |   |  | 1,030,633 |  
|Consolidation of unconsolidated subsidiaries                |  | (770,610           | ) |  | (806,245   | ) |  | (25,402   | )
|Equity investments compensation                             |  | (150,524           | ) |  | (189,123   | ) |  | (5,959    | )
|Change in fair value of marketable securities               |  | 32,418,403         |   |  | 18,651,625 |   |  | 587,638   |  
|Impairment loss in marketable securities                    |  | (2,176,217         | ) |  | (5,226,282 | ) |  | (164,659  | )
|Treasury stock                                              |  | (3,372             | ) |  | (2,169     | ) |  | (68       | )
|Reclassification from ROC GAAP marketable securities        |  | 21,198             |   |  |           |   |  |          |  
|Difference in application of equity accounting              |  | 396,777            |   |  | 1,458,562  |   |  | 45,953    |  
|Equity investments                                          |  | 1,995,468          |   |  | 3,000,434  |   |  | 94,532    |  
|                                                            |  |                    |   |  |            |   |  |           |  
|As adjusted under US GAAP                                   |  | 70,650,372         |   |  | 49,599,080 |   |  | 1,562,668 |  
|                                                            |  |                    |   |  |            |   |  |           |  
|Marketable Securities, held-to-maturity:                    |  |                    |   |  |            |   |  |           |  
|As reported under ROC GAAP                                  |  |                   |   |  |           |   |  |          |  
|Reclassification from other financial assets                |  | 4,166,594          |   |  | 2,942,434  |   |  | 92,704    |  
|                                                            |  |                    |   |  |            |   |  |           |  
|As adjusted under US GAAP                                   |  | 4,166,594          |   |  | 2,942,434  |   |  | 92,704    |  
|                                                            |  |                    |   |  |            |   |  |           |  
|Other Financial Assets, Non-current:                        |  |                    |   |  |            |   |  |           |  
|As reported under ROC GAAP                                  |  | 1,848,530          |   |  | 2,562,754  |   |  | 80,742    |  
|Reclassification to marketable securities, held-to-maturity |  | (1,848,530         | ) |  | (2,562,754 | ) |  | (80,742   | )
|                                                            |  |                    |   |  |            |   |  |           |  
|As adjusted under US GAAP                                   |  |                   |   |  |           |   |  |          |  
|                                                            |  |                    |   |  |            |   |  |           |  



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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



|                                                      |  |                    |   |  |             |   |  |           |  
|----------------------------------------------------- |  | ------------------ | - |  | ----------- | - |  | --------- | -
|                                                      |  | As of December 31, |  
|                                                      |  | 2003               |   |  | 2004        |  
|                                                      |  | NT$000            |   |  | NT$000     |   |  | US$000   |  
|Other Assets:                                         |  |                    |   |  |             |   |  |           |  
|As reported under ROC GAAP                            |  | 2,333,991          |   |  | 4,916,309   |   |  | 154,893   |  
|Consolidation of unconsolidated subsidiaries          |  | 1,649              |   |  | 1,206       |   |  | 38        |  
|                                                      |  |                    |   |  |             |   |  |           |  
|As adjusted under US GAAP                             |  | 2,335,640          |   |  | 4,917,515   |   |  | 154,931   |  
|                                                      |  |                    |   |  |             |   |  |           |  
|Goodwill:                                             |  |                    |   |  |             |   |  |           |  
|As reported under ROC GAAP                            |  |                   |   |  | 4,497,726   |   |  | 141,705   |  
|Goodwill upon conversion of convertible bonds         |  | 325,302            |   |  | 325,302     |   |  | 10,249    |  
|Goodwill arising from merger with SiSMC               |  |                   |   |  | (1,026,277  | ) |  | (32,334   | )
|Goodwill due to acquisition                           |  | 98,268,000         |   |  | 98,268,000  |   |  | 3,096,030 |  
|Impairment loss on goodwill                           |  |                   |   |  | (31,719,607 | ) |  | (999,357  | )
|                                                      |  |                    |   |  |             |   |  |           |  
|As adjusted under US GAAP                             |  | 98,593,302         |   |  | 70,345,144  |   |  | 2,216,293 |  
|                                                      |  |                    |   |  |             |   |  |           |  
|Accrued Expenses:                                     |  |                    |   |  |             |   |  |           |  
|As reported under ROC GAAP                            |  | 5,213,758          |   |  | 9,204,536   |   |  | 289,998   |  
|Consolidation of unconsolidated subsidiaries          |  | 3,438              |   |  | 7,568       |   |  | 239       |  
|Accrued interest for convertible bonds                |  | 745,261            |   |  | 989,698     |   |  | 31,181    |  
|Release from reacquisition of bonds                   |  | (106,416           | ) |  | (706,882    | ) |  | (22,271   | )
|Compensation                                          |  | 12,618             |   |  | 28,659      |   |  | 903       |  
|                                                      |  |                    |   |  |             |   |  |           |  
|As adjusted under US GAAP                             |  | 5,868,659          |   |  | 9,523,579   |   |  | 300,050   |  
|                                                      |  |                    |   |  |             |   |  |           |  
|Financial Instrument Liabilities:                     |  |                    |   |  |             |   |  |           |  
|As reported under ROC GAAP                            |  |                   |   |  |            |   |  |          |  
|Bifurcated exchangeable feature in exchangeable bonds |  | 3,426,698          |   |  | 125,899     |   |  | 3,967     |  
|                                                      |  |                    |   |  |             |   |  |           |  
|As adjusted under US GAAP                             |  | 3,426,698          |   |  | 125,899     |   |  | 3,967     |  
|                                                      |  |                    |   |  |             |   |  |           |  
|Minority Interests:                                   |  |                    |   |  |             |   |  |           |  
|As reported under ROC GAAP                            |  | 15,078,024         |   |  | 8,728,877   |   |  | 275,012   |  
|Consolidation of unconsolidated subsidiaries          |  | 50                 |   |  | 17,297      |   |  | 545       |  
|Others                                                |  | (39,887            | ) |  | (135,920    | ) |  | (4,282    | )
|                                                      |  |                    |   |  |             |   |  |           |  
|As adjusted under US GAAP                             |  | 15,038,187         |   |  | 8,610,254   |   |  | 271,275   |  
|                                                      |  |                    |   |  |             |   |  |           |  



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Cash Flows Information



|                                                                  |  |                                 |   |  |             |   |  |             |   |  |            |  
|----------------------------------------------------------------- |  | ------------------------------- | - |  | ----------- | - |  | ----------- | - |  | ---------- | -
|                                                                  |  | For the year ended December 31, |  
|                                                                  |  | 2002                            |   |  | 2003        |   |  | 2004        |  
|                                                                  |  | NT$000                         |   |  | NT$000     |   |  | NT$000     |   |  | US$000    |  
|Cash flows from operating activities, ROC GAAP                    |  | 30,526,954                      |   |  | 49,624,987  |   |  | 73,937,930  |   |  | 2,329,487  |  
|Remuneration paid to directors and supervisors                    |  |                                |   |  | (5,650      | ) |  | (12,618     | ) |  | (398       | )
|Difference due to principles in consolidation                     |  | (20,765                         | ) |  | (76,626     | ) |  | (165,141    | ) |  | (5,203     | )
|                                                                  |  |                                 |   |  |             |   |  |             |   |  |            |  
|Cash flows from operating activities, US GAAP                     |  | 30,506,189                      |   |  | 49,542,711  |   |  | 73,760,171  |   |  | 2,323,886  |  
|Cash flows from investing activities, ROC GAAP                    |  | (36,438,724                     | ) |  | (24,114,432 | ) |  | (83,132,307 | ) |  | (2,619,165 | )
|Net effect of time deposits reclassified to marketable securities |  | (1,905,493                      | ) |  | (8,874,541  | ) |  | (16,147,719 | ) |  | (508,750   | )
|Difference due to principles in consolidation                     |  | 309,704                         |   |  | 65,582      |   |  | 125,364     |   |  | 3,950      |  
|                                                                  |  |                                 |   |  |             |   |  |             |   |  |            |  
|Cash flows from investing activities, US GAAP                     |  | (38,034,513                     | ) |  | (32,923,391 | ) |  | (99,154,662 | ) |  | (3,123,965 | )
|Cash flows from financing activities, ROC GAAP                    |  | 3,162,286                       |   |  | 17,581,150  |   |  | (6,832,256  | ) |  | (215,257   | )
|Remuneration paid to directors and supervisors                    |  |                                |   |  | 5,650       |   |  | 12,618      |   |  | 398        |  
|                                                                  |  |                                 |   |  |             |   |  |             |   |  |            |  
|Cash flows from financing activities, US GAAP                     |  | 3,162,286                       |   |  | 17,586,800  |   |  | (6,819,638  | ) |  | (214,859   | )
|Foreign exchange effect, ROC GAAP                                 |  | 747,864                         |   |  | 777,620     |   |  | (1,363,167  | ) |  | (42,948    | )
|Difference due to principles in consolidation                     |  | 11,344                          |   |  | (6,504      | ) |  | (61,392     | ) |  | (1,934     | )
|                                                                  |  |                                 |   |  |             |   |  |             |   |  |            |  
|Foreign exchange effect, US GAAP                                  |  | 759,208                         |   |  | 771,116     |   |  | (1,424,559  | ) |  | (44,882    | )
|Net increase in cash and cash equivalents, ROC GAAP               |  | (2,001,620                      | ) |  | 43,869,325  |   |  | (17,389,800 | ) |  | (547,883   | )
|Net effect of time deposits reclassified to marketable securities |  | (1,905,493                      | ) |  | (8,874,541  | ) |  | (16,147,719 | ) |  | (508,750   | )
|Difference due to principles in consolidation                     |  | 300,283                         |   |  | (17,548     | ) |  | (101,169    | ) |  | (3,187     | )
|                                                                  |  |                                 |   |  |             |   |  |             |   |  |            |  
|Net (decrease) increase in cash and cash equivalents, US GAAP     |  | (3,606,830                      | ) |  | 34,977,236  |   |  | (33,638,688 | ) |  | (1,059,820 | )
|Cash and cash equivalents at beginning of year, US GAAP           |  | 57,825,901                      |   |  | 54,219,071  |   |  | 89,196,307  |   |  | 2,810,218  |  
|                                                                  |  |                                 |   |  |             |   |  |             |   |  |            |  
|Cash and cash equivalents at end of year, US GAAP                 |  | 54,219,071                      |   |  | 89,196,307  |   |  | 55,557,619  |   |  | 1,750,398  |  
|                                                                  |  |                                 |   |  |             |   |  |             |   |  |            |  



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



Concentration of credit risk



The Group designs, develops, manufactures and markets a variety of semiconductor products. Financial instruments that potentially subject
the Group to significant concentrations of credit risk consist principally of cash and cash equivalents and trade accounts and notes receivable. The Group limits its exposure to credit loss by depositing its cash and cash equivalents with high
credit quality financial institutions. The Groups revenues and trade accounts and notes receivable are derived primarily from the sale of production foundry wafers, including memory and logic products and wafers. For the years ended December
31, 2003 and 2004, the Group distributed its products on a global basis but mainly to divisions in North America (37.30% and 42.46%, respectively), Asia (55.82% and 42.19%, respectively), and Europe and others (6.88% and 15.35%, respectively). The
Groups sales are primarily denominated in currencies other than NT Dollars, primarily US Dollars. Two customers revenue represented 12% and 13%, respectively, of the consolidated revenue for the year ended December 31, 2002, one
customers revenue represented 10% of the consolidated revenue for the year ended December 31, 2003, and two customers revenue represented 11% and 10%, respectively, of the consolidated revenue for the year ended December 31, 2004. The
Group routinely assesses the financial strength of substantially all customers. The Group also requires collateral for certain sales to mitigate the credit risk.



Merger



On July 1, 2004, the Company acquired SiSMC by issuing 357,143 thousands shares with a fair value of approximately NT$8,811 million. SiSMC is principally engaged in
manufacturing of integrated circuits and components of semiconductors. Through the acquisition, the Company expected to enlarge business scales and improve global competitiveness.



The acquisition was accounted for using the purchase method and the estimated fair value of the assets acquired and liabilities assumed at
the date of acquisition are summarized as follows:



|                                       |  |                 |  |        
|-------------------------------------- |  | --------------- |  | -------
|                                       |  | At July 1, 2004
|                                       |  | NT$000         |  | US$000
|Cash and cash equivalents              |  | 70,384          |  | 2,218  
|Other current assets                   |  | 890,447         |  | 28,054 
|Property, plant and equipment          |  | 11,614,711      |  | 365,933
|Other intangible assets                |  | 291,046         |  | 9,170  
|Other assets                           |  | 478,890         |  | 15,088 
|                                       |  |                 |  |        
|Total assets acquired                  |  | 13,345,478      |  | 420,463
|                                       |  |                 |  |        
|Current liabilities                    |  | 2,349,479       |  | 74,023 
|Long-term debt                         |  | 2,545,455       |  | 80,197 
|Other liabilities                      |  | 35,396          |  | 1,115  
|                                       |  |                 |  |        
|Total liabilities assumed              |  | 4,930,330       |  | 155,335
|                                       |  |                 |  |        
|Net assets acquired                    |  | 8,415,148       |  | 265,127
|                                       |  |                 |  |        
|Fair value of share consideration paid |  | 8,810,714       |  | 277,590
|                                       |  |                 |  |        
|Goodwill - tax deductible              |  | 395,566         |  | 12,463 
|                                       |  |                 |  |        



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UNITED MICROELECTRONICS CORPORATION AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS



NewAccounting Pronouncements



In December 2004, the FASB issued SFAS Statement No. 123 (revised 2004), Share-Based Payment (SFAS 123R), which is a revision of
FASB Statement No. 123 Accounting for Stock-Based Compensation. SFAS 123R requires all share-based payments to employees, including grants of employee stock options, to be recognized in the financial statements based on their fair
values. It is effective for the Group no later than its first fiscal year beginning after June 15, 2005. The Group does not expect a material impact on its financial statements resulting from the adoption of SFAS Statement No. 123 (R).



In November 2004, SFAS Statement No. 151 amended the guidance in ARB No. 43, Chapter 4,
Inventory Pricing, to clarify the accounting for abnormal amounts of idle facility expense, freight, handling costs, and wasted material (spoilage) should be recognized as current period charges and requires the allocation of fixed
production overheads to inventory based on the normal capacity of the production facilities. The guidance is effective for inventory costs incurred during fiscal years beginning after June 15, 2005. The adoption of SFAS No. 151 is not expected to
have a material effect on earnings or financial position of the Group.



F-85



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##### Table of Contents

EXHIBIT INDEX



|               |  |                                                                                                                                                                                                                                                                          
|-------------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit Number |  | Description of Exhibits                                                                                                                                                                                                                                                  
|               | 
|*1.1           |  | Articles of Incorporation of the Company as last amended on June 13, 2005 (English Translation)                                                                                                                                                                          
|               | 
|2.1            |  | Form of Deposit Agreement among the Company, and Holders and Beneficial Owners of American Depositary Shares issued thereunder, including the form of American Depositary Shares
(1)                                                                                     
|               | 
|4.1            |  | Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, Ko-Kuan Section, No. 20-22, Hsinchu, Taiwan, ROC, the site of
Fab 6A (in Chinese with English summary translation) (2)                    
|               | 
|4.2            |  | Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, third section of first phase, Hsinchu, Taiwan, ROC, the site of
Fab 8AB and United Tower (in Chinese with English summary translation) (3)
|               | 
|4.3            |  | Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, third section of first phase, Hsinchu, Taiwan, ROC, the site of
Fab 8C (in Chinese with English summary translation) (4)                  
|               | 
|4.4            |  | Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, third section of first phase, Hsinchu, Taiwan, ROC, the site of
Fab 8D (in Chinese with English summary translation) (5)                  
|               | 
|4.5            |  | Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, third section of second phase, Hsinchu, Taiwan, ROC, the site of
Fab 8E (in Chinese with English summary translation) (6)                 
|               | 
|4.6            |  | Lease Agreement with Hsinchu Science Park Administration in relation to government-owned land located at Hsinchu Science Park, Gin-Shan section, Hsinchu, Taiwan, ROC, the site of Fab 8F (in
Chinese with English summary translation) (7)                              
|               | 
|4.7            |  | Lease Agreement with Southern Taiwan Science Park Administration in relation to government-owned land located at Tainan Science Park, Tainan, Taiwan, ROC, the site of Fab 12A (in Chinese with
English summary translation) (8)                                         
|               | 
|4.8            |  | Merger Agreement, entered into as of February 26, 2004, between United Microelectronics Corporation and SiS Microelectronics Corporation (English Translation) (9)                                                                                                       
|               | 
|*8.1           |  | List of Significant Subsidiaries of United Microelectronics Corporation                                                                                                                                                                                                  
|               | 
|11.1           |  | Code of Ethics for Directors, Supervisors and Officers (10)                                                                                                                                                                                                              
|               | 
|11.2           |  | Employee Code of Conduct (11)                                                                                                                                                                                                                                            
|               | 
|*12.1          |  | Certification of our Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                                                                                                                                                   
|               | 
|*12.2          |  | Certification of our Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                                                                                                                                                   
|               | 
|*13.1          |  | Certification of our Chief Executive Officer pursuant to 18 U.S.C.§ 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002                                                                                                                           
|               | 
|*13.2          |  | Certification of our Chief Financial Officer pursuant to 18 U.S.C.§ 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002                                                                                                                           
|               | 
|*15.1          |  | Consent of Independent Registered Public Accounting Firm                                                                                                                                                                                                                 

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|* | filed herewith.
|- | ---------------

|(1) | Incorporated by reference to Exhibit (a) to the Registrants Registration Statement on Form F-6 (File No. 333-13796) filed with the Commission on August 6, 2001.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | Incorporated by reference to Exhibit 10.6 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | Incorporated by reference to Exhibit 10.7 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(4) | Incorporated by reference to Exhibit 10.8 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(5) | Incorporated by reference to Exhibit 10.9 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(6) | Incorporated by reference to Exhibit 10.10 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(7) | Incorporated by reference to Exhibit 10.11 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(8) | Incorporated by reference to Exhibit 10.12 to the Registrants Registration Statement on Form F-1 (File No. 333-12444) filed with the Commission on August 28, 2000, as amended.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(9) | Incorporated by reference to Exhibit 4.8 to the Registrants Annual Report on Form 20-F for the fiscal year ended December 31, 2003 (File No. 1-15128) filed with the Commission
on June 17, 2004.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(10) | Incorporated by reference to Exhibit 99.1 to the Form 6-K filed with the Commission on March 25, 2005.
|---- | ------------------------------------------------------------------------------------------------------

|(11) | Incorporated by reference to Exhibit 99.2 to the Form 6-K filed with the Commission on March 25, 2005.
|---- | ------------------------------------------------------------------------------------------------------