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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549



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FORM 10-K



ANNUAL REPORT

PURSUANT TO SECTIONS
13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934



(Mark One)

|x | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | -----------------------------------------------------------------------------------------------------------------------------------------



For the fiscal year ended December 31, 2005



OR



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------



For the transition period
from to 
 to



Commission file number 001-13828



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MEMC Electronic Materials, Inc.

(Exact name of registrant as specified in its charter)



|                                                               |  |                                     
|-------------------------------------------------------------- |  | ------------------------------------
|Delaware                                                       |  | 56-1505767                          
|(State or other jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification No.)
|                                                               | 
|501 Pearl Drive (City of OFallon) St. Peters, Missouri        |  | 63376                               
|(Address of principal executive offices)                       |  | (Zip Code)                          



Registrants
telephone number, including area code:

(636) 474-5000



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



|                            |  |                                           
|--------------------------- |  | ------------------------------------------
|Title of Each Class         |  | Name of Each Exchange on Which Registered:
|$.01 Par Value Common Stock |  | New York Stock Exchange                   



Securities
Registered Pursuant to Section 12(g) of the Act:

None

(Title of Class)



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Indicate by check mark if the registrant is a well-known seasoned issuer, as
defined in Rule 405 of the Securities Act.    Yes ̈No  x



Indicate by check mark if the
registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes ̈No  x



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 ̈No  x



Indicate by check mark if disclosure of delinquent filers pursuant to
Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrants knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to
this Form 10-K. ̈



Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer or a non-accelerated filer. See the definition of
accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act.    Large accelerated filer    x    Accelerated
filer ̈Non-accelerated filer ̈



Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes ̈No  x



The aggregate market value of the voting stock held by nonaffiliates of the registrant, based upon the closing price of such stock on June 30, 2005
of $15.77, as reported by the New York Stock Exchange, and 209,323,066 shares outstanding on such date, was approximately $2,096,304,097. The number of shares outstanding of the registrants Common Stock as of June 30, 2006, was
222,023,958 shares.



DOCUMENTS INCORPORATED BY REFERENCE



1. Portions of the registrants 2005 Annual Report
to Stockholders (Part I and Part II)



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PART I



|Item 1. | Business
|------- | --------



Overview



We are a leading worldwide producer of wafers for the semiconductor industry. We are one of four wafer suppliers having more than a 10% share of the
overall market. We operate manufacturing facilities in every major semiconductor manufacturing region throughout the world, including Europe, Japan, Malaysia, South Korea, Taiwan and the United States. Our customers include virtually all of the
major semiconductor device manufacturers in the world, including the major memory, microprocessor and applications specific integrated circuit, or ASIC, manufacturers, as well as the worlds largest foundries. We provide wafers in sizes ranging
from 100 millimeters (4 inch) to 300 millimeters (12 inch) and in three general categories: prime polished, epitaxial and test/monitor. A prime polished wafer is a highly refined, pure wafer with an ultra-flat and ultra-clean surface. An epitaxial
wafer consists of a thin, silicon layer grown on the polished surface of the wafer. A test/monitor wafer is substantially the same as a prime polished wafer, but with some less rigorous specifications.



We were formed in 1984 as a Delaware corporation and completed our initial
public stock offering in 1995. Our corporate structure includes, in addition to our wholly owned subsidiaries, an 80%-owned consolidated joint venture in South Korea (MEMC Korea Company or MKC). In February 2004, we acquired approximately 100%
ownership of Taisil Electronic Materials Corporation (Taisil) in Taiwan. Prior to February 2004, Taisil was a 45%-owned unconsolidated joint venture. In addition, in August 2004, we acquired 100% ownership of MEMC Southwest Inc. in Sherman, Texas.
Prior to August 2004, MEMC Southwest Inc. was an 80%-owned consolidated joint venture.



On November 13, 2001, an investor group led by Texas Pacific Group and including TPG Wafer Holdings LLC and funds managed by Leonard Green & Partners, L.P. and TCW/Crescent Mezzanine Management LLC
(collectively, TPG) acquired beneficial ownership of approximately 72% of our outstanding common stock and approximately $910 million of our debt from E.ON AG. All of the debt acquired by TPG from E.ON has been restructured or repaid. As part of the
restructuring, TPG received shares of our Series A Cumulative Convertible Preferred Stock. On July 10, 2002, TPG converted all of the outstanding shares of Series A Cumulative Convertible Preferred Stock and the related accumulated but unpaid
dividends into 125,010,556 shares of MEMC common stock. TPG sold approximately 15 million, 34 million, 66 million and 18 million shares of our common stock in public offerings in May 2003, February 2004, February 2005
and August 2005, respectively. TPG currently beneficially owns approximately 25% of our outstanding common stock.



In 2005, we were engaged in one reportable industry segmentthe design, manufacture and sale of silicon wafers. Financial information regarding this
industry segment is contained in our 2005 Annual Report, which information is incorporated herein by reference.



Industry Background



Almost all semiconductors are manufactured from wafers, and thus the performance of the wafer industry is highly correlated to the unit shipments of the
semiconductor device industry. The worldwide semiconductor device industry grew at a compound annual growth rate of 10% from 73 billion units in 1985 to 456 billion units in 2005, according to SIA & WSTS. In 2005, semiconductor device units
increased 5% from 2004, according to SIA & WSTS.



The
silicon wafer industry grew at a compound annual growth rate of 9% from 1,118 million square inches in 1985 to 6,645 million square inches in 2005, according to SIA/SEMI. In 2005, silicon wafer volumes grew 6.1%, according to SEMI.



The fabrication of semiconductor devices requires a large
number of complex and repetitive processing steps to layer different materials and imprint various features on a single wafer. Wafers are becoming



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increasingly differentiated by specific physical and electrical characteristics such as flatness, silicon purity and uniform crystal structures. As markets
for semiconductor devices continue to evolve and become more specialized, we believe device manufacturers recognize the enhanced role that wafers and other materials play in improving device performance and reducing their production costs.



Semiconductor device manufacturers continue to move towards
devices with shrinking device geometries (i.e., the distance between the electrical contacts on the device) and more stringent technical specifications. The wafers required to produce these next-generation devices are being developed in larger
diameters. Thus, semiconductor device manufacturers continue to move to larger diameter wafers, with the 200 millimeter wafer being the primary wafer used today.



Over the past decade, we believe the wafer industry has consolidated, with only four suppliers now having more than a 10%
share of the overall market. We believe this change in the competitive landscape is causing segmentation between larger and smaller producers with larger manufacturers gaining an increasing share of the overall wafer market. Semiconductor device
manufacturers seek suppliers with whom they can better align wafer technology development with their own product development efforts. We believe these manufacturers will continue to select wafer suppliers that offer advanced technological
capabilities, a broad product portfolio and superior service to satisfy their exacting device requirements.



Products



We offer
wafers with a wide variety of features satisfying numerous product specifications to meet our customers exacting requirements. Our wafers vary in diameter, surface features, composition, purity levels, crystal properties and electrical
properties. We provide our customers with a reliable supply of high quality wafers with consistent characteristics. These wafers range from 100 millimeter to 300 millimeter in diameter. Our wafers are used as a starting material for the manufacture
of various types of semiconductor devices, including microprocessor, memory, logic and power devices. In turn, these semiconductor devices are used in computers, cellular phones and other mobile electronic devices, automobiles and other consumer and
industrial products.



We continue to advance our products
capabilities. In addition to other new product offerings, we offer wafers with the Magic Denuded Zone®, or MDZ®, product feature. As compared to traditional techniques, this patented product feature can increase our customers yields in both prime polished and epitaxial wafers by drawing impurities away from the surface of
the wafer in a manner that is efficient and reliable, with results that are reproducible.



Our products include three general categories of wafers:



Prime Polished Wafers



Our prime polished wafer is a highly refined, pure wafer with an ultraflat and ultraclean surface. Our prime polished wafers are manufactured with a sophisticated chemical-mechanical polishing process that removes defects and leaves an
extremely smooth surface. As devices become more complex, wafer flatness and cleanliness requirements, along with crystal perfection, become increasingly important because these properties have a significant impact on our customers processes
and yields.



Our OPTIA wafer is a 100% defect-free crystalline structure based on our patented technologies
and processes, including MDZ®. We believe the
OPTIA wafer is the most technically advanced
polished wafer available today.



Our annealed wafer is a prime
polished wafer with near surface crystalline defects dissolved during a high-temperature thermal treatment.



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Epitaxial Wafers



Our epitaxial, or EPI, wafers consist of a thin silicon layer grown on the polished surface of the wafer. Typically, the
epitaxial layer has different electrical properties from the underlying wafer. This provides our customers with better isolation between circuit elements than a polished wafer, and the ability to tailor the wafer to the specific demands of the
device. Without sufficient isolation of the various circuit elements, the elements could communicate electrically with each other, which could render the device useless. Epitaxial wafers provide improved isolation, thereby allowing for increased
reliability of the finished semiconductor device and greater efficiencies during the semiconductor manufacturing process, which ultimately allows for more complex semiconductor devices.



Our AEGIS product is designed for certain specialized applications requiring high resistivity epitaxial wafers and our MDZ® product feature. The AEGIS wafer includes a thin epitaxial layer grown on a standard starting wafer. The
AEGIS wafers thin epitaxial layer
eliminates harmful defects on the surface of the wafer, thereby allowing device manufacturers to increase yields and improve process reliability.



Test/Monitor Wafers



We supply test/monitor wafers to our customers for their use in testing semiconductor fabrication lines and processes. Although test/monitor wafers are
substantially the same as prime polished wafers with respect to cleanliness, and in some cases flatness, other specifications are generally less rigorous. This allows us to produce some of the test/monitor wafers from the portion of the silicon
ingot that does not meet customer specifications for wafers to be used in the manufacture of semiconductors.



Sales, Marketing and Customers



We market our products primarily through a global direct sales force. We have customer service and support centers globally, including in China, France, Germany, Italy, Japan, Malaysia, South Korea, Taiwan and the United States. A key
element of our marketing strategy is establishing and maintaining close relationships with our customers. We accomplish this through multi-functional teams of technical, sales and marketing, and manufacturing personnel. These teams work closely with
our customers to continually optimize our products for their production processes in their current and future facilities. We monitor changing customer needs and target our research and development and manufacturing to produce wafers adapted to each
customers process and requirements. We complete sales principally through agreements of one year or less (such agreements often are of three months or six months duration), which agreements specify price and typically indicate only expected
volumes or market share.



We sell our products to virtually all
major semiconductor device manufacturers, including the major memory, microprocessor and ASIC manufacturers, as well as the worlds largest foundries. Samsung accounted for more than 10% of our sales in 2005. No other customer represented 10%
or more of our 2005 sales.



We sell our products to certain
customers under consignment arrangements. Generally, these consignment arrangements require us to maintain a certain quantity of product in inventory at the customers facility or at a storage facility designated by the customer. Under these
arrangements, we ship the wafers to the storage facility, but do not charge the customer or recognize revenue for those wafers until title passes to the customer. Title passes when the customer pulls the product from the assigned MEMC storage
facility or storage area or, if the customer does not pull the product within a stated period of time (generally 6090 days), at the end of that period, or when the customer otherwise agrees to take title to the product. Until that time, the
wafers are considered part of MEMCs inventory and are reflected on MEMCs books and records as inventory. As such, these consignment arrangements are essentially inventory transfer arrangements. At December 31, 2005, we had
approximately $18 million of inventory held on consignment.



Manufacturing



To meet our customers
needs worldwide, we have established a global manufacturing network consisting of nine manufacturing facilities.



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Our wafer manufacturing process begins with high purity semiconductor grade polysilicon. The polysilicon
is melted in a quartz crucible along with minute amounts of electrically active elements such as arsenic, boron, phosphorous or antimony. We then lower a silicon seed crystal into the melt and slowly extract it from the melt. The resultant body of
silicon is called an ingot. The temperature of the melt, speed of extraction and rotation of the crucible govern the diameter of the ingot, while the concentration of the electrically active element in the melt governs the electrical properties of
the wafers to be made from the ingot. This is a complex, proprietary process requiring many control features on the crystal-growing equipment.



We then grind the ingots to the specified diameter and slice the ingots into thin wafers. Next, we prepare the wafers for surface polishing with a
multi-step process using precision wafer planarization machines, edge contour machines and chemical etchers. Final polishing and cleaning processes give the wafers the clean and ultraflat mirror polished surfaces required for the fabrication of
semiconductor devices. We further process some of our products into epitaxial wafers by utilizing a chemical vapor deposition process to deposit a single crystal silicon layer on the polished surface.



In certain of our manufacturing facilities we have fully integrated
manufacturing capabilities that encompass the full range of wafer manufacturing process steps, including ingot growth, wafer slicing, wafer polishing and epitaxial deposition. We conduct certain of our processes in state-of-the-art cleanroom
environments.



Raw Materials



We obtain our requirements for several raw materials, equipment, parts and
supplies from sole suppliers. The main raw material in our production process is polysilicon. We use two types of polysilicon: granular polysilicon and chunk polysilicon. We produce all of our requirements for granular polysilicon at our facility in
Pasadena, Texas. We do not believe there are other sources of semiconductor grade granular polysilicon. We produce chunk polysilicon in our Merano, Italy facility. Chunk polysilicon can be substituted for granular polysilicon, although our
manufacturing throughput and yields could be adversely affected. We believe our ability to meet the majority of our polysilicon requirements through our in-house capabilities provides us with a key cost advantage to compete more effectively in the
wafer industry. We have previously announced our plans to expand our polysilicon production capacity over the next few years. We sell some polysilicon to third parties and we also buy some polysilicon on the open market.



Research and Development



The wafer market is characterized by continuous technological development
and product innovation. We believe that continued and timely development of new products and enhancements to existing products are necessary to maintain our competitive position. Our goal in research and development is to maintain a close working
relationship with our customers to continually develop new products and refine existing products to meet the needs of the marketplace. Our research and development model combines engineering innovation with specific commercialization strategies. Our
model closely aligns our technology efforts with our customers requirements. We accomplish this through a better understanding of our customers technology requirements and through targeted research and development projects aimed at
developing products to meet those technology requirements. Some of these projects involve formal and informal joint development efforts with our customers.



In addition, in order to strengthen our customer relationships and interaction and to better target our research and development efforts, we assign
research and development engineers to key customers worldwide. We do this through our Applications Engineering Group, in our laboratories located in the United States, Italy, Japan and South Korea, as well as field and resident engineers located at
strategic locations throughout the world. The primary purpose of the Applications Engineering Group is to establish a close, technical working relationship with our customers to obtain a better knowledge of our customers material requirements.



We devote a portion of our research and development resources
to enhance our position in the crystal technology area. We have dedicated engineers and scientists, located in our St. Peters, Missouri, Merano, Italy



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and Chonan, South Korea facilities, to further our understanding of defect control, cost reduction and the use of granular polysilicon. In conjunction with
these efforts, we are developing wafering technologies to meet advanced flatness and particle requirements of our customers. In addition, we continue to focus on the development of our advanced epitaxial wafer technology with a dedicated staff of
scientists located primarily in our St. Peters, Missouri, Novara, Italy and Utsunomiya, Japan facilities, who focus on the development of new epitaxial wafer products and cost reduction processes.



In addition to our focus on advancements in wafer material properties, we
also continue to invest in research and development associated with larger wafer diameters. We produced our first 300 millimeter diameter wafer in 1991 and continue to enhance our 300 millimeter technology program using our staff of research and
development scientists, engineers and technicians located primarily in our St. Peters, Missouri and Utsunomiya, Japan facilities. In addition, we continue to focus on process design advancements to drive cost reductions and productivity
improvements.



We have also entered into a license agreement
for certain layer-transfer wafer technology and we are in the process of establishing production capability for 200 millimeter and 300 millimeter silicon-on-insulator (SOI) wafers using a dedicated group of engineers and scientists located in our
St. Peters, Missouri facility.



Competition



The market for wafers is highly competitive. We compete in all the major
semiconductor-producing regions of the world and face intense competition from established manufacturers. We estimate there are six major competitors in our industry; however, our major competitors are Shin-Etsu Handotai, SUMCO and Siltronic. Some
of our competitors have substantial financial, technical, engineering and manufacturing resources. Our wafers compete with wafers manufactured by others on the basis of product quality, consistency, price, technical innovation, customer service and
product availability. We believe we are competitive on the basis of these factors.



Proprietary Information and Intellectual Property



We believe that the success of our business depends in part on our proprietary technology, information, processes and know how. We try to protect our intellectual property rights based on patents and trade secrets as part of our ongoing
research, development and manufacturing activities. As of December 31, 2005, we owned of record or beneficially approximately 232 U.S. patents, of which approximately 19 will expire by 2010, approximately 44 will expire between 2011 and 2015
and approximately 169 will expire after 2015. As of December 31, 2005, we owned of record or beneficially approximately 365 foreign patents, of which approximately 53 will expire by 2010, approximately 33 will expire between 2011 and 2015 and
approximately 279 will expire after 2015. These foreign patents are generally counterparts of our U.S. patents. As of December 31, 2005, we had approximately 50 pending U.S. patent applications and approximately 317 pending foreign patent
applications. The patents we beneficially own relate to polysilicon technology. We exclusively licensed these patents from Albemarle Corporation in connection with our purchase of Albemarles granular polysilicon business. We may request that
these patents be assigned to us at any time in exchange for a nominal purchase price.



We have agreed to indemnify some of our customers against claims of infringement of the intellectual property rights of others in our sales contracts with these customers. Historically, we have not paid any claims
under these indemnification obligations and we do not have any pending indemnification claims.



Employees



At
December 31, 2005, we had approximately 5,000 full time employees and 500 temporary workers worldwide. We have approximately 1,500 unionized employees in our St. Peters, Missouri, Pasadena, Texas,



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South Korea and Italy facilities. We have not experienced any material work stoppages at any of our facilities due to labor union activities during the last
several years.



Geographic Information



Information regarding our foreign and domestic operations is contained in
Note 20, Geographic Segments, of Notes to Consolidated Financial Statements included in our 2005 Annual Report, which information is incorporated herein by reference.



Available Information



We make available free of charge through our website (http://www.memc.com) reports we file with the SEC, including our annual reports on Form 10-K,
quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as soon as reasonably practical after we electronically
file such material with, or furnish it to, the SEC.



|Item 1A. | Risk Factors
|-------- | ------------



This Annual Report on Form 10-K contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of
1995, including those set forth under Item 1. Business and Item 3. Legal Proceedings and those incorporated herein by reference from our 2005 Annual Report. In addition to the business risks and uncertainties discussed
elsewhere in this Form 10-K, the following are important risk factors which could cause actual results and events to differ materially from those contained in any forward-looking statement made by us.



Our business depends on the semiconductor device industry and if that
industry experiences future downturns, our sales could decrease and we could be forced to reduce our prices while maintaining fixed costs, all of which could have significant negative effects on our operating results and financial condition.



Our business depends in large part upon the market
demand for our customers semiconductors and products utilizing semiconductors. The semiconductor device industry experiences:



| |  |  | rapid technological change;
| | - |  | ---------------------------



| |  |  | product obsolescence;
| | - |  | ---------------------



| |  |  | changes in product mix;
| | - |  | -----------------------



| |  |  | price erosion; and
| | - |  | ------------------



| |  |  | fluctuations in product supply and demand
| | - |  | -----------------------------------------



From time to time, the semiconductor device industry has experienced significant downturns. These downturns often occur in connection with declines in
general economic conditions. Some of these downturns have lasted for more than a year and have resulted in a substantial decrease in demand for our products. For example, in 2001, the semiconductor industry experienced a significant downturn as a
result of weakened demand and a broad-based inventory correction. The 2001 downturn continued into early 2003. In the second half of 2004, much of the semiconductor industry experienced a downturn related to product oversupply and a resulting
inventory correction. These industry conditions continued into 2005, before improving in the second half of 2005. If the semiconductor device industry experiences future downturns, we will face pressure to reduce prices and we may need to further
rationalize capacity and reduce fixed costs. At the same time, our ability to reduce expenditures for capital, research and development and global infrastructure during an industry downturn is limited because of the need to maintain our competitive
position. If we are unable to reduce our expenses sufficiently to offset reductions in price and volume, our operating results and financial condition could be materially adversely affected.



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Our dependence on single and limited source suppliers could require us to obtain new qualifications
from customers and adversely affect our manufacturing throughput and yield.



We obtain several raw materials, equipment, parts and supplies from sole suppliers. Likewise, we obtain all of our requirements for granular polysilicon from our facility in Pasadena, Texas. In the case of granular
polysilicon, we believe that we could substitute chunk polysilicon for granular polysilicon. In either case, however, it may take us several months to transition to a new supplier and we may be required to obtain new qualifications from our
customers in order to change or substitute materials or sources of supply. We cannot predict whether we would be successful or how long the qualification process would take. In addition, our manufacturing process could be interrupted and our
manufacturing throughput and yields could be adversely affected. A failure to obtain a new qualification or a decrease in our manufacturing throughput or yields could have a material adverse effect on our operating results.



From time to time we have experienced limited supplies of certain raw
materials, equipment, parts and supplies, particularly polysilicon. Because of the cyclical nature of our industry, we may experience shortages of our key raw materials, equipment, parts and supplies in the future. A prolonged inability to obtain
raw materials, equipment, parts or supplies, or increases in prices resulting from these shortages could have a material adverse effect on our operating results.



The success of our currently planned expansion of polysilicon capacity and penetration of the solar market presents
business risks which could materially adversely affect our results of operations.



We are investing significantly in expanding our polysilicon production capacity. We are also making progress in our plan to make and sell wafers to the solar market. Historically, our expertise has been in the
production and sale of wafers to semiconductor customers. In order to succeed at our planned expansion activities, we will need to devote capital expenditures as well as the investment of management time and related resources to penetrate this
additional market. This could disrupt our existing business, affect our operating results and distract our management team. Expansion of our polysilicon production capacity is subject to risks such as availability of capital equipment; delays in
construction of new production capacity; and availability of additional precursor raw materials. Our plan to sell wafers into the solar market is subject to similar risks and, because it involves sales into a new application, it is also subject to
additional risks, including refining and adapting our manufacturing technologies for solar applications; creating and developing demand for and market acceptance of our technologies in the solar wafer market; marketing, promoting and distributing
wafers to solar customers; competing with other, better established, wafer manufacturers; and establishing and maintaining sufficient internal research and development, marketing, sales, production and customer service infrastructures to support
these efforts. There can be no assurance that we will be able to successfully penetrate the solar market. Use of resources that otherwise would have been made available to our semiconductor wafer customers could have material adverse consequences on
our results of operations if we fail to penetrate the solar market successfully.



Our expansion of our 300 millimeter production capacity in Taiwan presents business risks which could materially adversely affect our results of operations if we fail to manage this expansion successfully.



In July 2005, we embarked upon a significant
expansion of our 300 millimeter production capacity by establishing such production capacity at our Taisil facility in Taiwan, in addition to continuing our improvements to our Japan 300 millimeter operation. The establishment of this capacity at a
new facility involves significant risks, including availability and timing of capital equipment installation, distraction of worldwide and local management; costs and spending in excess of budgeted amounts; timing of production ramp; and
qualification of a new facility at new and existing customers. We believe that establishment of 300 millimeter capacity in Taiwan is important for strategic reasons, including market share and profitability. There can be no assurance that we will be
able to successfully reach our production, timing and cost goals for this expansion or maintain them for our Japan facility as customer specifications evolve. Use of capital and management resources that otherwise would have been made available to
expand other parts of our business could have material adverse consequences on our results of operations if we fail to manage this expansion successfully or do not improve our Japan 300 millimeter operations to keep pace with market requirements.



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We experience intense competition in the wafer industry which could force us to reduce our prices
to retain market share or face losing market share and revenues.



We face intense competition in the wafer industry from established manufacturers throughout the world. If we cannot compete effectively with other wafer manufacturers, our operating results could be materially
adversely affected. Some of our competitors have substantial financial, technical, engineering and manufacturing resources to develop products that currently, and may in the future, compete favorably against our products.



We compete on the basis of product quality, consistency, price, technical
innovation, customer service and product availability. We expect that our competitors will continue to improve the design and performance of their products and to introduce new products with competitive price and performance characteristics. We may
need to reduce our prices to retain market share, which could have a material adverse effect on our operating results.



If we fail to meet changing customer demands, we may lose customers and our sales could suffer.



The wafer industry changes rapidly. Changes in our customers
requirements result in new and more demanding technology, product specifications and diameters, and manufacturing processes. Our ability to remain competitive will depend upon our ability to develop technologically advanced products and processes.
We must continue to meet the increasingly demanding requirements of our customers on a cost-effective basis. As a result, we expect to continue to make significant investments in research and development and equipment. We cannot be certain that we
will be able to successfully introduce, market and cost effectively manufacture any new products, or that we will be able to develop new or enhanced products and processes that satisfy customer needs or achieve market acceptance.



Because we cannot easily transfer production of specific products from
one of our manufacturing facilities to another, manufacturing delays at a single facility could result in a loss of product volume.



It typically takes three to six months for our customers to qualify a manufacturing facility to produce a specific product, but it can take longer
depending upon a customers requirements and market conditions. Interruption of operations at any of our primary wafer manufacturing facilities could result in delays or cancellations of shipments of wafers and a loss of product volume.
Likewise, interruption of operations at our granular polysilicon manufacturing facility could adversely affect our wafer manufacturing throughput and yields and could result in our inability to produce certain qualified wafer products, delays or
cancellations of shipments of wafers and a loss of product volume. A number of factors could cause interruptions, including labor disputes, equipment failures, or shortages of raw materials or supplies. Unions represent some of the employees at our
wafer facilities in St. Peters, Missouri, Italy and South Korea and our granular polysilicon facility in Pasadena, Texas. A strike at any of these facilities could cause interruptions in manufacturing. We cannot be certain that alternate qualified
capacity would be available on a timely basis or at all.



If we do not continue to reduce our manufacturing costs and operating expenses, we may not be able to compete effectively in our industry.



The success of our business depends, in part, on our continuous reduction of manufacturing costs and operating expenses. The
wafer industry has historically experienced price erosion and will likely continue to experience such price erosion. If we are not able to reduce our manufacturing costs and operating expenses sufficiently to offset future price erosion, our
operating results will be adversely affected. During the past few years, we have engaged in various cost-cutting and other initiatives intended to reduce costs and increase productivity. These activities have included reduction of headcount,
refinement of our processes and efforts to increase yields and reduce cycle time. We cannot assure you that we will be able to continue to reduce our manufacturing costs and operating expenses. Moreover, any future closure of facilities or reduction
of headcount may adversely affect our ability to manufacture wafers in required volumes to meet customer demand and may result in other production disruptions.



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We are subject to periodic fluctuations in foreign currency exchange rates which can cause reported
financial results to vary significantly from period to period.



Approximately 69% of our sales in 2005 were made outside North America. We expect that international sales will continue to represent a significant percentage of our total sales. In addition, a significant portion of our manufacturing
operations is located outside of the United States. Sales outside of the United States expose us to currency exchange rate fluctuations. Our risk exposure from these sales is primarily related to Euro, Japanese Yen and Korean Won. Our risk exposure
from expenses at international manufacturing facilities is concentrated in Euro, Japanese Yen, Korean Won, Malaysian Ringgit and New Taiwanese Dollar. To the extent that our sales in foreign currencies occur at foreign sites which incur expenses in
those currencies, our net exposure is reduced. We generally hedge receivables denominated in foreign currencies at the time of sale.



Our foreign subsidiaries have debt denominated in Euro, Japanese Yen, New Taiwanese Dollars and U.S. Dollars. We generally do not hedge these net
foreign currency exposures.



We recognized net currency losses
totaling approximately $1 million in 2005, net current losses totaling approximately $2 million in 2004 and net currency gains totaling approximately $14 million in 2003. We cannot predict whether these foreign currency exchange risks inherent in
doing business in foreign countries will have a material adverse effect on our operations and financial results in the future.



We may acquire other businesses, products or technologies; if we do, we may be unable to integrate them with our business effectively or at all,
which may impair our financial performance.



If we
find appropriate opportunities, we may acquire businesses, products or technologies that we believe are strategic. If we acquire a business, product or technology, the process of integration may produce unforeseen operating difficulties and
expenditures and may absorb significant attention of our management that would otherwise be available for the ongoing development of our business. If we make future acquisitions, we may issue shares of stock that dilute other stockholders, expend
cash, incur debt, assume contingent liabilities or create additional expenses related to amortizing other intangible assets with estimated useful lives, any of which might harm our business, financial condition or results of operations.



Our business may be harmed if we fail to properly protect our
intellectual property.



We believe that the success of
our business depends in part on our proprietary technology, information, processes and know how. We try to protect our intellectual property rights based on trade secrets and patents as part of our ongoing research, development and manufacturing
activities. We cannot be certain, however, that we have adequately protected or will be able to adequately protect our technology, that our competitors will not be able to utilize our existing technology or develop similar technology independently,
that the claims allowed with respect to any patents held by us will be broad enough to protect our technology or that foreign intellectual property laws will adequately protect our intellectual property rights. Moreover, we cannot be certain that
our patents do or will provide us with a competitive advantage.



The protection of our intellectual property rights and the defense of claims of infringement against us by third parties may subject us to costly patent litigation.



Any litigation in the future to enforce patents issued to us, to protect
trade secrets or know how possessed by us or to defend us or indemnify others against claimed infringement of the rights of others could have a material adverse effect on our financial condition and operating results. From time to time, we receive
notices from other companies that we may be infringing certain of their patents or other rights. If we are unable to resolve these matters satisfactorily, or to obtain licenses on acceptable terms, we may face litigation, which could have a material
adverse effect on us. In fact, we are presently involved in multiple cases involving allegations of patent infringement. Regardless of the validity or successful outcome of any such intellectual property claims, we may need to expend significant
time and expense to protect our intellectual property rights or to defend against claims



9



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of infringement by third parties, which could have a material adverse effect on us. If we lose any such litigation, we may be required to:



| |  |  | pay substantial damages;
| | - |  | ------------------------



| |  |  | seek licenses from others; or
| | - |  | -----------------------------



| |  |  | change, or stop manufacturing or selling, some of our products.
| | - |  | ---------------------------------------------------------------



Any of these outcomes could have a material adverse effect on our business, results of operations or financial condition.



We have a limited number of principal customers and a loss of one or
several of those customers would hurt our business.



Our operating results could materially suffer if we experience a significant reduction in, or loss of, purchases by one or more of our top customers. We made approximately 57% of our sales to our ten biggest customers in 2005. Only Samsung
accounted for more than 10% of our sales in 2005.



We
are subject to periodic foreign economic downturns and political instability, which may adversely affect our sales and cost of doing business in those regions of the world.



Economic downturns in the Asia Pacific region and Japan have affected our operating results in the past, and economic
downturns in those and other regions in which we operate could affect our operating results in the future. Additionally, other factors may have a material adverse effect on our operations in the future, including:



| | the imposition of governmental controls or changes in government regulation;
|- | ----------------------------------------------------------------------------



| | export license requirements;
|- | ----------------------------



| | restrictions on the export of technology;
|- | -----------------------------------------



| | geo-political instability; and
|- | ------------------------------



| | trade restrictions and changes in tariffs.
|- | ------------------------------------------



We cannot predict whether these economic risks inherent in doing business in foreign countries will have a material adverse effect on our operations and
financial results in the future.



We are required to
evaluate our internal control under Section 404 of the Sarbanes-Oxley Act of 2002 and any adverse results from such evaluation could result in a loss of investor confidence in our financial reports and could have an adverse effect on our stock
price.



Pursuant to Section 404 of the
Sarbanes-Oxley Act of 2002, we are required to furnish a report by our management on our internal control over financial reporting. Such report contains, among other matters, an assessment of the effectiveness of our internal control over financial
reporting as of the end of our fiscal year, including a statement as to whether or not our internal control over financial reporting is effective. This assessment must include disclosure of any material weaknesses in our internal control over
financial reporting identified by management. Such report must also contain a statement that our auditors have issued an attestation report on managements assessment of such internal controls. Public Company Oversight Board Auditing Standard
No. 2 provides the professional standards and related performance guidance for auditors to attest to, and report on, managements assessment of the effectiveness of internal control over financial reporting under Section 404.



Each year we must perform the system and process documentation
and evaluation needed to comply with Section 404. During this process, if our management identifies one or more material weaknesses in our internal control over financial reporting, we will be unable to assert such internal control is
effective. For both fiscal 2004 and fiscal 2005, we reported at least one material weakness in our internal control over financial reporting. Although we have taken actions to address these material weaknesses, there can be no assurance that these



10



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actions will fully address such material weaknesses, or that we will not have one or more material weaknesses in the future. If we are unable to assert that
our internal control over financial reporting is effective presently or in the future (or if our auditors are unable to attest that our managements report is fairly stated or if they are unable to express an opinion on the effectiveness of our
internal controls), we could lose investor confidence in the accuracy and completeness of our financial reports, which could have an adverse effect on our stock price.



We are subject to numerous environmental laws and regulations, which could require us to discharge environmental
liabilities, increase our manufacturing and related compliance costs or otherwise adversely affect our business.



We are subject to a variety of foreign, federal, state and local laws and regulations governing the protection of the environment. These environmental
laws and regulations include those relating to the use, storage, handling, discharge, emission, disposal and reporting of toxic, volatile or otherwise hazardous materials used in our manufacturing processes. These materials may have been or could be
released to the environment at properties currently or previously owned or operated by us, at other locations during the transport of the materials, or at properties to which we send substances for treatment or disposal. If we were to violate or
become liable under environmental laws and regulations or become non-compliant with permits required at some of our facilities, we could be held financially responsible and incur substantial costs, including cleanup costs, fines and civil or
criminal sanctions, third-party property damage or personal injury claims. Groundwater and/or soil contamination has been detected at four of our facilities. We believe we are taking all necessary remedial steps at these facilities. We do not expect
these known conditions to have a material impact on our business. However, environmental issues relating to presently known or unknown matters could require additional investigation, assessment or expenditures. In addition, new laws and regulations
or stricter enforcement of existing laws and regulations could give rise to additional compliance costs and liabilities.



The market price of our common stock has fluctuated significantly and may continue to do so.



The market price of our common stock may be affected by various factors,
including:



| |  |  | quarterly fluctuations in our operating results resulting from factors such as timing of orders from and shipments to major customers, product mix and competitive pricing pressures;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | announcements of technological innovations, new products or upgrades to existing products by us or our competitors;
| | - |  | -------------------------------------------------------------------------------------------------------------------



| |  |  | market conditions in the semiconductor device and wafer industries;
| | - |  | -------------------------------------------------------------------



| |  |  | developments in patent or other proprietary rights by us or by our competitors;
| | - |  | -------------------------------------------------------------------------------



| |  |  | changes in our relationships with our customers;
| | - |  | ------------------------------------------------



| |  |  | interruption of operations at our manufacturing facilities;
| | - |  | -----------------------------------------------------------



| |  |  | actual or perceived changes in our relationship with our largest stockholder, TPG;
| | - |  | ----------------------------------------------------------------------------------



| |  |  | the size of the public float of our common stock;
| | - |  | -------------------------------------------------



| |  |  | announcements of operating results that are not aligned with the expectations of investors; and
| | - |  | -----------------------------------------------------------------------------------------------



| |  |  | general stock market trends.
| | - |  | ----------------------------



Technology company stocks in general have experienced extreme price and trading volume fluctuations that often have been unrelated to the operating
performance of these companies. This market volatility may adversely affect the market price of our common stock.



If we fail to comply with covenants under our credit facility, the lenders could cause outstanding amounts to become immediately due and payable,
and we might not have sufficient funds and assets to pay such loans.



We are party to a $200 million revolving credit facility with National City Bank of the Midwest, US Bank National Association and other lenders named therein. This facility contains certain restrictive covenants,



11



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including covenants to maintain minimum consolidated EBITDA and interest coverage ratio, as those terms are defined in such agreement. A continuing violation
of any of these covenants, which in our industry could occur in a sudden or sustained downturn, would be deemed an event of default under the facility. In such event, upon election of the lenders, the loan commitments under the credit facility would
terminate and the loans and accrued interest then outstanding would be due and payable immediately. We may not have sufficient funds and assets to cover any such required payments and may not be able to obtain replacement financing on a timely basis
or at all. In addition, because all of the capital stock of most of our domestic subsidiaries and 65% of the capital stock of certain of our foreign subsidiaries is pledged as collateral under the facility, the lenders could foreclose on that stock
upon an event of default. These events would have a material adverse effect on us. As of December 31, 2005, we had no outstanding borrowings under this facility, although we had approximately $8 million of outstanding third party letters of
credit backed by this facility at such date.



Future
sales of shares of our common stock may depress the price of our common stock.



If we or our stockholders sell a substantial number of shares of our common stock in the public market, or investors become concerned that substantial sales might occur, the market price of our common stock could
decrease. We have granted TPG registration rights with respect to all of the shares of our common stock and warrants to purchase common stock owned by TPG. Future sales of our common stock or warrants to purchase our common stock by TPG in the
public market, or the perception that such sales might occur, could cause such a decrease in the price of our common stock.



TPG has significant voting power to influence our direction and policies, which could prevent a favorable acquisition of us and create other
conflicts of interest between us and TPG.



TPG,
through its approximate 25% beneficial ownership interest of our common stock, has significant voting power to influence our direction and policies, including any merger, consolidation or sale of all or substantially all of our assets. For example,
under our restructuring agreement with TPG, we must either obtain the consent of TPG or give TPG a right of first refusal over any issuances of our equity securities to any person or group to the extent that the equity securities would have 10% or
more of the voting power of all of our then outstanding voting securities. As a practical matter, as a result of its share ownership, TPG has the ability to influence the election and composition of our Board of Directors. Two of the seven members
of our current Board of Directors are partners of certain TPG entities.



Certain provisions of our Restated Certificate of Incorporation and Restated By-Laws could delay or make more difficult a change of control or change in management that would benefit our stockholders.



Certain provisions of our Restated Certificate of Incorporation and Restated
By-Laws may delay, defer or make more difficult:



| |  |  | a merger, tender offer or proxy contest;
| | - |  | ----------------------------------------



| |  |  | the assumption of control by a holder of a large block of our securities; and
| | - |  | -----------------------------------------------------------------------------



| |  |  | the replacement or removal of current management by our stockholders.
| | - |  | ---------------------------------------------------------------------



For example, our Restated Certificate of Incorporation divides the Board of Directors into three classes, with members of each class to be elected for
staggered three-year terms. This provision may make it more difficult for stockholders to change the majority of directors and may frustrate accumulations of large blocks of common stock by limiting the voting power of such blocks. This may further
discourage a change of control or change in current management.



These provisions may limit participation by our stockholders in any merger or other change of control transaction, whether or not the transaction is favored by current management or would be favorable to our stockholders. These provisions
may also make removal of current management by our stockholders more difficult, even if such removal would be beneficial to the stockholders generally.



12



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In addition, our Board of Directors is authorized to issue up to 50,000,000 shares of preferred stock
without the vote of our holders of common stock, subject to certain restrictions on the issuance of preferred stock contained in our restructuring agreement with TPG. The issuance of preferred stock could adversely affect the voting power or other
rights of the holders of our common stock and could have the effect of delaying, deferring or impeding a change in control of us.



Cautionary Statement Regarding Forward-Looking Statements



The following statements are or may constitute forward-looking statements:



| |  |  | statements set forth in this Form 10-K or statements incorporated by reference from documents we have filed with the Securities and Exchange Commission, including possible or
assumed future results of our operations, including but not limited to any statements contained herein or therein concerning:
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that we have the financial resources needed to meet business requirements for the next 12 months, including capital expenditures and working capital requirements;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that our tax reserves reflect the probable outcome of known contingencies;
| | - |  | -------------------------------------------------------------------------------------



| |  |  | Our expectation that the adoption of SFAS 123R will have an estimated negative $0.03 to $0.04 impact on diluted earnings per share for the year ended December 31, 2006;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that as markets for semiconductor devices continue to evolve and become more specialized, device manufacturers will recognize the enhanced role that wafers and other
materials play in improving device performance and reducing their production costs;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that wafer industry consolidation is causing segmentation between larger and smaller wafer producers, with larger manufacturers gaining an increasing share of the overall
wafer market;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that semiconductor device manufacturers seek suppliers with whom they can better align wafer technology development with their own product development efforts, and the
belief that these manufacturers will continue to select wafer suppliers that offer advanced technology capabilities, a broad product portfolio and superior service to satisfy their exacting device requirements;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that the OPTIAwafer is the
most technically advanced polished wafer available today;
| | - |  | ------------------------------------------------------------------------------------------------



| |  |  | Our belief that there are not other sources of semiconductor grade granular polysilicon;
| | - |  | ----------------------------------------------------------------------------------------



| |  |  | Our belief that our ability to meet the majority of our polysilicon requirements through our in-house capabilities provides us with a key cost advantage;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that continued and timely development of new products and enhancements to existing products is necessary to maintain our competitive position;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our expectation that our competitors will continue to improve the design and performance of their products to introduce new products with competitive price and performance
characteristics;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that our wafers are competitive with competitors on the basis of product quality, consistency, price, technical innovation, customer service and product
availability;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that the success of our business depends in part on our proprietary technology, information, processes and know how;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our expectation that international sales will continue to represent a significant percentage of our total sales;
| | - |  | ----------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that that we could substitute chunk polysilicon for granular polysilicon;
| | - |  | ------------------------------------------------------------------------------------



| |  |  | Our belief that establishment of 300 millimeter capacity in Taiwan is important for strategic reasons, including market share and profitability;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------



13



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| |  |  | Our expectation that we will continue to make significant investments in research and development and equipment;
| | - |  | ----------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that the success of our business depends in part on our proprietary technology, information, processes and know how;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that we are taking all necessary environmental remediation steps at our facilities, and our expectation that these known conditions will not have a material impact on our
business;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our belief that our existing facilities and equipment are well maintained, in good operating condition and are adequate to meet our current requirements;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | The impact of pending litigation on us;
| | - |  | ---------------------------------------



| |  |  | Our expectation that contributions to our pension plans will be approximately $16 million in 2006;
| | - |  | --------------------------------------------------------------------------------------------------



| |  |  | Our determination that the adoption of SFAS 154 will not have a material impact on our consolidated results of operations and financial condition;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Other statements contained or incorporated by reference in this Form 10-K regarding matters that are not historical facts; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------



| |  |  | Any statements preceded by, followed by or that include the words believes, expects, predicts, anticipates, intends,
estimates, should, may or similar expressions.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such
forward-looking statements. You should not place undue reliance on such statements, which speak only as of the date that they were made. Factors that could cause actual results to differ materially are set forth under this Item 1A. Risk
Factors.



These cautionary statements should be
considered in connection with any written or oral forward-looking statements that we may issue in the future. We do not undertake any obligation to release publicly any revisions to such forward-looking statements to reflect later events or
circumstances or to reflect the occurrence of unanticipated events.



|Item 1B. | Unresolved Staff Comments
|-------- | -------------------------



None.



|Item 2. | Properties
|------- | ----------



Our principal executive offices are located at 501 Pearl Drive (City of OFallon), St. Peters, Missouri 63376, and our telephone number at that
address is (636) 474-5000. Our principal manufacturing and administrative facilities comprised approximately 3.9 million square feet as of December 31, 2005 and were situated in the following locations:



|                       |  |               
|---------------------- |  | --------------
|Location               |  | Square Footage
|St. Peters, MO, USA    |  | 744,000       
|Sherman, TX, USA       |  | 693,000       
|Pasadena, TX, USA      |  | 436,000       
|Hsinchu, Taiwan        |  | 522,000       
|Chonan, South Korea    |  | 453,000       
|Utsunomiya, Japan      |  | 327,000       
|Merano, Italy          |  | 327,000       
|Novara, Italy          |  | 322,000       
|Kuala Lumpur, Malaysia |  | 86,000        



14



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In December 2005, we purchased from the City of OFallon, Missouri the portion of our St. Peters
facility that had been leased from the City of OFallon in connection with an industrial revenue bond financing. We lease the land on which our Pasadena, Texas facility is located. The term of the Pasadena lease expires in 2030 and is
extendable for four (4) additional renewal terms of five (5) years each. We lease the land on which our Hsinchu, Taiwan facility is located. This lease expires in 2014. We also lease our facility in Kuala Lumpur, Malaysia. This lease
expires in March 2009.



We believe that our existing facilities
and equipment are well maintained, in good operating condition and are adequate to meet our current requirements. The extent of utilization of these facilities varies from plant to plant and from time to time during the year.



|Item 3. | Legal Proceedings
|------- | -----------------



Albemarle Corporation et al. vs. MEMC Electronic Materials, Inc., et al.



In a case entitledDamewood vs. Ethyl Corporation, et al. (Cause No. 96-38521), filed on August 1, 1996,
three employees of the former operator of MEMC Pasadenas plant, Albemarle Corporation, filed suit against us and others in the 189th Judicial District Court, Harris County, Texas. The employees alleged that they sustained injuries during an
explosion at that plant on January 27, 1996. We settled this matter with the plaintiffs and were dismissed as a party. One of the other defendants, Ethyl Corporation, was the only defendant in this case at the time of trial in October 1998. A
jury awarded a verdict in favor of the plaintiffs that resulted in a judgment against Ethyl Corporation in the amount of $6.8 million. Ethyl Corporation appealed this judgment. Ethyl Corporation and the plaintiffs subsequently settled this matter
for $5.2 million.



On September 29, 1998, Albemarle
Corporation made a demand against us for defense and indemnity in this case on behalf of Ethyl Corporation. Albemarle Corporation assumed the obligation to defend and indemnify Ethyl Corporation under an agreement in which Ethyl Corporation
transferred ownership of the plant where the injury took place to Albemarle Corporation. In November 1998, we made a demand for indemnity in this case against Albemarle Corporation. Demands for indemnity made by Albemarle Corporation on behalf of
Ethyl Corporation and by us are both based on contractual indemnity language contained in the contract for the sale of the MEMC Pasadena plant from Albemarle Corporation to us.



In a case entitledAlbemarle Corporation et al. vs. MEMC Electronic Materials, Inc., et al. (Cause
No. 2002-59930), filed on November 20, 2002 in the 55th Judicial District Court, Harris County, Texas, Albemarle and its insurers filed suit against us and MEMC Pasadena seeking indemnification and costs of defense in the above matter.
On February 14, 2003, we filed an answer denying the allegations by Albemarle Corporation and its insurers. On March 17, 2003, we filed a counterclaim against Albemarle Corporation seeking indemnification, costs of defense and payment of
certain funds recovered by Albemarle Corporations workers compensation carrier in connection with the above matter. On October 22, 2004, the court entered an order granting Albemarles motion for summary judgment and denying
our motion for summary judgment. The court did not consider the issue of damages. We appealed the summary judgment decision on April 15, 2005. Both parties have briefed the issue with the appellate court and are awaiting a decision.



We do not believe that this matter will have a material adverse effect on
us. Due to uncertainty regarding the litigation process, however, the scope and interpretation of contractual indemnity provisions and the status of any insurance coverage, the outcome of this matter could be unfavorable, in which event we might be
required to pay damages and other expenses.



Lemelson
Medical, Education and Research Foundation, Limited Partnership vs. ESCO Electronics Corporation, et al.



In a case entitledLemelson Medical, Education and Research Partnership vs. ESCO Electronics Corporation, et al. (Civil Action No. 00-0660-PHX-ROS)
filed on April 14, 2000, the Lemelson Medical,



15



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Education and Research Foundation, Limited Partnership filed suit against us and approximately 90 other companies in the United States District Court for the
District of Arizona. The Lemelson Foundation alleges that we infringe on certain patents owned by the Lemelson Foundation related to bar coding and machine vision reading systems. The Lemelson Foundation seeks damages against us in an unstated
amount, attorneys fees and an order enjoining us from further infringement of the unexpired patents. On March 29, 2001, the court issued an order to stay this litigation pending the entry of a final non-appealable judgment in
earlier-filed actions involving the same patents. In January 2004, the court in these earlier-filed actions ruled that the patents at issue were invalid, unenforceable and not infringed by bar code scanners and machine vision reading systems very
similar to the bar code scanners and machine vision reading systems used by us. On February 1, 2006, the U.S. District Court for the District of Arizona granted plaintiff Lemelson Medical, Education and Research Foundation, Limited
Partnership motion, and dismissed with prejudice all claims against us and the other defendants and accordingly, this litigation against us has been terminated.



Sumitomo Mitsubishi Silicon Corporation et al. vs. MEMC Electronic Materials, Inc.



On December 14, 2001, MEMC filed a lawsuit against Sumitomo Mitsubishi
Silicon Corporation (SUMCO) and several of its affiliates in the Northern District of California (the First SUMCO Case) alleging infringement of one of MEMCs U.S. patents. On March 16, 2004, the court entered
summary judgment against MEMC. MEMC appealed this decision to the U.S. Federal Circuit Court of Appeals, and on August 22, 2005, the U.S. Federal Circuit Court of Appeals reversed the grant of summary judgment with respect to inducement of
infringement by SUMCO, and the case was remanded to the U.S. District Court for further proceedings. On February 24, 2006, the U.S District Court granted certain summary judgment motions of each of SUMCO and MEMC. In light of the summary
judgment rulings in favor of SUMCO, on February 27, 2006 the U.S District Court issued a final judgment against MEMC in the First SUMCO Case. On February 28, 2006, MEMC filed its Notice of Appeal of the grant of certain of the summary
judgment rulings in favor of SUMCO in the First SUMCO Case with the U.S. Federal Circuit Court of Appeals.



On July 13, 2004, SUMCO and certain of its affiliates filed a lawsuit against MEMC in the U.S. District Court for the District of Delaware (the
Second SUMCO Case) in a case captioned Sumitomo Mitsubishi Silicon Corporation, aka SUMCO, a corporation of Japan and SUMCO USA Corporation, a Delaware corporation, v. MEMC Electronic Materials, Inc., a Delaware corporation, Civil
Action No. 04-852-SLR. In May 2005, MEMC successfully had this case removed to the Northern District of California, although the Second SUMCO Case and the First SUMCO Case will not be consolidated. In the Second SUMCO Case, plaintiffs allege
that MEMC violated the antitrust laws by attempting to control sales of low defect silicon wafers in the United States, including through its patent policies and enforcement of its patents related to low defect silicon wafers. Plaintiffs also seek a
declaratory judgment that plaintiffs wafers do not infringe the claims of two MEMC patents and that these two MEMC patents are invalid and unenforceable. Finally, plaintiffs allege that these two MEMC patents are void and unenforceable because
of MEMCs alleged patent misuse. Plaintiffs seek treble damages in an unspecified amount, and attorneys fees and costs incurred by plaintiffs in the Second SUMCO Case and in the First SUMCO Case. MEMC had asserted defenses against these
claims, including a counterclaim for infringement of one of the two patents. In June 2006, in light of the pending appeal with the U.S. Federal Circuit Court of Appeals on certain matters from the First SUMCO Case, certain of the counts related to
the two MEMC patents were dismissed from the Second SUMCO Case without prejudice. MEMC believes that SUMCOs position in the Second SUMCO Case has no merit and is asserting a vigorous defense.



S.O.I.TEC Silicon on Insulator Technologies S.A. and Soitec USA, Inc. vs.
MEMC Electronic Materials, Inc.



On November 21,
2005, S.O.I.TEC Silicon on Insulator Technologies S.A. and Soitec USA, Inc. (Soitec) filed a Complaint for Declaratory Judgment against MEMC in the U.S. District Court for the District of Delaware (Civil Action No. 05-806) alleging
invalidity and/or non-infringement of seven MEMC U.S. patents. In January 2006, MEMC filed a motion to dismiss with respect to six of the seven patents in the case, and also brought a counterclaim against Soitec for infringement in the United States
by Soitec of the remaining U.S. patent. The



16



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parties subsequently agreed to the dismissal of six of the seven patents from the case. Soitec filed an amended complaint in April 2006, and MEMC filed its
amended answer and counterclaim in May 2006. Although the case is in the early stages, we believe that Soitecs declaratory judgment action against us has no merit, and we are asserting a vigorous defense against that claim, as well as pursuing
our counterclaim for infringement. Also, on December 28, 2005, MEMC filed suit against Soitec in France for infringement by Soitec of three of MEMCs foreign patents. This case remains in the early stages. We do not believe that either
Soitec case, should they be decided against MEMC, in whole or in part, will have a material adverse effect on us. Due to uncertainty regarding the litigation process, however, the outcome of both matters are unpredictable and the result of either
case could be unfavorable for MEMC.



ASi Industries GmbH vs.
MEMC Electronic Materials, Inc. and MEMC Pasadena, Inc.



On June 19, 2006, ASi Industries GmbH (ASi) filed a Complaint for Breach of Contract and Declaratory Judgment against MEMC in the U.S. District Court for the Eastern District of Missouri (Civil Action
No. 4:06-CV-00951-CDP) alleging breach of contract by MEMC, unjust enrichment, tortious interference with ASis contracts, antitrust violations and seeking a declaratory judgment of non-infringement, all related to a purchase order
agreement related to polysilicon. MEMC has not yet filed its answer and any related counterclaims. Although the case is in the very early stages, we believe our actions under the purchase order at issue were permitted, and are asserting a vigorous
defense, as well as intending to pursue our counterclaims for infringement related to certain intellectual property related to polysilicon technology.



We do not believe that the ASi case, should it be decided against MEMC, in whole or in part, will have a material adverse effect on us. Due to uncertainty
regarding the litigation process, however, the outcome of this matter is unpredictable and the result of the case could be unfavorable for MEMC.



|Item 4. | Submission of Matters to a Vote of Security Holders
|------- | ---------------------------------------------------



No matters were submitted to a vote of security holders during the fourth quarter of the fiscal year covered by this report.



17



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PART II



|Item 5. | Market for Registrants Common Equity and Related Stockholder Matters
|------- | ---------------------------------------------------------------------



The narrative and tabular information regarding the market for our common equity and related stockholder matters required by
this item is set forth under Note 21, Unaudited Quarterly Financial Information, of Notes to Consolidated Financial Statements, included in our 2005 Annual Report and under Stockholders Information in our
2005 Annual Report, which information is incorporated herein by reference. We have not paid any dividends on our common stock for the last three fiscal years. Under the terms of our $200 million National City Bank revolving credit facility, we
are prohibited from paying cash dividends on our common stock. Likewise, under the restructuring agreement between us and TPG, we cannot pay cash dividends on our common stock without the consent of TPG.



The information required under this Item concerning equity compensation plan
information is set out below under Item 12 and is incorporated herein by this reference.



|Item 6. | Selected Financial Data
|------- | -----------------------



The tabular information (including the footnotes thereto) required by this item is set forth under Five Year Selected Financial Highlights in
our 2005 Annual Report, which information is incorporated herein by reference.



|Item 7. | Managements Discussion and Analysis of Financial Condition and Results of Operations
|------- | -------------------------------------------------------------------------------------



The information required by this item is set forth under
Managements Discussion and Analysis of Financial Condition and Results of Operations in our 2005 Annual Report, which information is incorporated herein by reference.



|Item 7A. | Quantitative and Qualitative Disclosures About Market Risk
|-------- | ----------------------------------------------------------



The information required by this item is set forth under Market Risk included in Managements
Discussion and Analysis of Financial Condition and Results of Operations in our 2005 Annual Report, which information is incorporated herein by reference.



|Item 8. | Financial Statements and Supplementary Data
|------- | -------------------------------------------



The information required by this item is set forth under Consolidated Statements of Operations, Consolidated Balance Sheets,
Consolidated Statements of Cash Flows, Consolidated Statements of Stockholders Equity (Deficiency), Notes to Consolidated Financial Statements and Reports of the Independent Registered Public
Accounting Firm in our 2005 Annual Report, all of which are incorporated herein by reference.



|Item 9. | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
|------- | ------------------------------------------------------------------------------------



None.



|Item 9A. | Controls and Procedures
|-------- | -----------------------



|(a) | Evaluation of Disclosure Controls and Procedures
|--- | ------------------------------------------------



We carried out an evaluation as of December 31, 2005, under the supervision and with the participation of our management, including our Chief
Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rules 13-15(e) and 15d-15(e) under



18



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the Securities Exchange Act of 1934, as amended (the Exchange Act). Based upon that evaluation, our Chief Executive Officer and Chief Financial
Officer concluded that our disclosure controls and procedures were not effective as of December 31, 2005, based on the material weaknesses discussed in Managements Report on Internal Control Over Financial Reporting set out below.



|(b) | Managements Report on Internal Control Over Financial Reporting
|--- | ----------------------------------------------------------------



Our management is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rules 13a-15(f) and
15d-15(f) under the Securities Exchange Act of 1934. Our internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external
purposes in accordance with U.S. generally accepted accounting principles.



As of December 31, 2005, management conducted an assessment of the effectiveness of the Companys internal control over financial reporting based upon the framework issued by the Committee of Sponsoring
Organizations of the Treadway Commission (COSO) in Internal ControlIntegrated Framework. Based upon this assessment, management concluded that, as of December 31, 2005, the Company did not maintain effective internal control over
financial reporting. Management has identified the following material weaknesses:



| | 1. | Ineffective Company-Level Controls.We did not maintain effective company-level controls as defined in the Internal ControlIntegrated Framework, published
by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). These deficiencies related to four of the five components of internal control as defined by COSO (control environment, risk assessment, information and communication,
and monitoring). Specifically,
| | -- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | Our control environment did not sufficiently promote an appropriate level of control awareness throughout the organization, and this material weakness was a contributing factor in
the development of other material weaknesses described below;
| | -- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | b. | We did not maintain a sufficient number of adequately trained personnel necessary to anticipate and identify risks critical to financial reporting;
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------------------



| | c. | There was inadequate emphasis to employees regarding the importance of controls and employees duties and control responsibilities; and
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------



| | d. | We had inadequate monitoring controls to ensure that appropriate personnel regularly obtain evidence that controls are functioning effectively and that identified control
deficiencies are remediated timely.
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



These
deficiencies resulted in more than a remote likelihood that a material misstatement of our interim or annual consolidated financial statements would not be prevented or detected.



| | 2. | Inadequate Expertise in U.S. Generally Accepted Accounting Principles. We lacked adequately trained finance and accounting personnel with appropriate U.S. generally
accepted accounting principles (US GAAP) expertise. As a result, an effective internal secondary review of technical accounting matters could not be performed in certain circumstances. Specifically, this material weakness encompasses specific
deficiencies in, and resulted in errors in accounting for certain transactions related to, the following areas:
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | Accounting for income taxes. Our finance and accounting personnel did not have adequate expertise in accounting for income taxes to ensure the timely identification
of discrete events that should not have been included in the annual effective tax rate calculation used to record income taxes in our interim consolidated financial statements. This deficiency also resulted in the failure to ensure the proper
identification and recording of deferred tax assets and liabilities. This deficiency resulted in a restatement of our consolidated financial statements for the first and second quarters of 2005 and resulted in material errors in our consolidated
financial statements for
| | -- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



19



---

| | the third quarter of 2005 and as of and for the year ended December 31, 2005, that were corrected prior to issuance.
| | --------------------------------------------------------------------------------------------------------------------



| | b. | Accounting for the factoring of receivables. Our finance and accounting personnel did not have adequate expertise in accounting for factored receivables to ensure the sale criteria
in SFAS No. 140, Accounting for the Transfers and Servicing of Financial Assets and Extinguishments of Liabilities, were met for factored receivables. As a result, we failed to record certain short-term borrowings in our consolidated balance
sheet and reflect the borrowings as a financing activity in the statement of cash flows, which resulted in a restatement of the consolidated statement of cash flows for the year ended December 31, 2004, contributed to the restatement of our
consolidated financial statements for the first and second quarters of 2005; and resulted in errors in our consolidated financial statements for the third quarter of 2005 and as of and for the year ended December 31, 2005, that were corrected
prior to issuance.
| | -- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | c. | Accounting for employee benefit plans. Our finance and accounting personnel did not have adequate expertise in accounting for employee benefit plans to ensure the timely
identification of business events impacting the assumptions used to calculate benefit obligations. As a result, we incorrectly reduced the projected benefit obligation by a material amount that would have reduced expense in future periods. This
deficiency contributed to the restatement of our consolidated financial statements for the first and second quarters of 2005 and resulted in errors in our consolidated financial statements for the third quarter of 2005 and as of and for the year
ended December 31, 2005, that were corrected prior to issuance.
| | -- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | d. | Other accounting matters. Our finance and accounting personnel lacked sufficient US GAAP expertise to ensure that nonroutine transactions and other accounting matters were
properly reflected in our consolidated financial statements. As a result, we failed to properly account for business interruption insurance recoveries, the deferral of certain labor costs, the receipt of a government grant, the elimination of
intercompany profits in inventory, the classification of short-term investments, and certain stock option compensation costs. This deficiency contributed to the restatement of our consolidated financial statements for the first and second quarters
of 2005 and the consolidated statements of cash flows for the years ended December 31, 2004 and 2003, and resulted in errors in our consolidated financial statements for the third quarter of 2005 and as of and for the year ended December 31,
2005, that were corrected prior to issuance.
| | -- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | 3. | Inadequate Revenue Recognition Policies and Procedures. We did not have adequate policies and procedures in place related to revenue recognition, and we lacked
personnel with adequate expertise in revenue recognition criteria under US GAAP. Specifically, we had inadequate policies and procedures to:
| | -- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | Ensure that appropriate evidence of sales agreements with customers exists and that all aspects of sales agreements are considered in the determination of the appropriate
accounting,
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | b. | Effectively identify and analyze the terms of multiple element arrangements,
| | -- | ----------------------------------------------------------------------------



| | c. | Assess international shipping terms and identify bill and hold arrangements, and
| | -- | --------------------------------------------------------------------------------



| | d. | Identify terms in sales arrangements with customers that indicate such arrangements are consignments.
| | -- | -----------------------------------------------------------------------------------------------------



This deficiency resulted in a restatement of our consolidated financial statements for the first and second quarters of 2005
and resulted in material errors in our consolidated financial statements for the third quarter of 2005 and as of and for the year ended December 31, 2005, that were corrected prior to issuance.



KPMG LLP, an independent registered public accounting firm, has issued an
audit report on managements assessment of the companys internal control over financial reporting. Their report appears below.



20



---

|(c) | Report of Independent Registered Public Accounting Firm
|--- | -------------------------------------------------------



The Board of Directors

MEMC Electronic Materials, Inc.:



We have audited managements assessment, included in the accompanying Managements Report on Internal Control over Financial Reporting (Item 9A(b)), that MEMC Electronic Materials, Inc. (the Company or MEMC) did not maintain
effective internal control over financial reporting as of December 31, 2005 because of the effect of material weaknesses identified in managements assessment, based on criteria established in Internal Control  Integrated
Framework, issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Companys management is responsible for maintaining effective internal control over financial reporting and for its assessment of the
effectiveness of internal control over financial reporting. Our responsibility is to express an opinion on managements assessment and an opinion on the effectiveness of the Companys internal control over financial reporting based on our
audit.



We conducted our audit in accordance with the standards
of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all
material respects. Our audit included obtaining an understanding of internal control over financial reporting, evaluating managements assessment, testing and evaluating the design and operating effectiveness of internal control, and performing
such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.



A companys internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial
reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A companys internal control over financial reporting includes those policies and procedures that
(1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as
necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors
of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the companys assets that could have a material effect on the financial statements.



Because of its inherent limitations, internal control over
financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions or that the degree of
compliance with the policies or procedures may deteriorate.



A
material weakness is a control deficiency, or combination of control deficiencies, that results in more than a remote likelihood that a material misstatement of the annual or interim financial statements will not be prevented or detected. The
following material weaknesses have been identified and included in managements assessment as of December 31, 2005:



| | 1. | Ineffective Company-Level Controls.MEMC did not maintain effective company-level controls as defined in the Internal ControlIntegrated Framework,
published by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). These deficiencies related to four of the five components of internal control as defined by COSO (control environment, risk assessment, information and
communication, and monitoring). Specifically,
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | MEMCs control environment did not sufficiently promote an appropriate level of control awareness throughout the organization, and this material weakness was a contributing
factor in the development of other material weaknesses described below;
| | -- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



21



---

| | b. | MEMC did not maintain a sufficient number of adequately trained personnel necessary to anticipate and identify risks critical to financial reporting;
| | -- | -----------------------------------------------------------------------------------------------------------------------------------------------------



| | c. | There was inadequate emphasis to employees regarding the importance of controls and employees duties and control responsibilities; and
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------



| | d. | MEMC had inadequate monitoring controls to ensure that appropriate personnel regularly obtain evidence that controls are functioning effectively and that identified control
deficiencies are remediated timely.
| | -- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



These
deficiencies resulted in more than a remote likelihood that a material misstatement of MEMCs interim or annual consolidated financial statements would not be prevented or detected.



| | 2. | Inadequate Expertise in U.S. Generally Accepted Accounting Principles. MEMC lacked adequately trained finance and accounting personnel with appropriate U.S. generally
accepted accounting principles (US GAAP) expertise. As a result, an effective internal secondary review of technical accounting matters could not be performed in certain circumstances. Specifically, this material weakness encompasses specific
deficiencies in, and resulted in errors in accounting for certain transactions related to, the following areas:
| | -- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | Accounting for income taxes. MEMCs finance and accounting personnel did not have adequate expertise in accounting for income taxes to ensure the timely identification of
discrete events that should not have been included in the annual effective tax rate calculation used to record income taxes in MEMCs interim consolidated financial statements. This deficiency also resulted in the failure to ensure the proper
identification and recording of deferred tax assets and liabilities. This deficiency resulted in a restatement of MEMCs consolidated financial statements for the first and second quarters of 2005 and resulted in material errors in MEMCs
consolidated financial statements for the third quarter of 2005 and as of and for the year ended December 31, 2005.
| | -- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | b. | Accounting for the factoring of receivables. MEMCs finance and accounting personnel did not have adequate expertise in accounting for factored receivables to ensure the sale
criteria in SFAS No. 140, Accounting for the Transfers and Servicing of Financial Assets and Extinguishments of Liabilities, were met for factored receivables. As a result, MEMC failed to record certain short-term borrowings in MEMCs
consolidated balance sheet and reflect the borrowings as a financing activity in the statement of cash flows, which resulted in a restatement of the consolidated statement of cash flows for the year ended December 31, 2004, contributed to the
restatement of MEMCs consolidated financial statements for the first and second quarters of 2005; and resulted in errors in MEMCs consolidated financial statements for the third quarter of 2005 and as of and for the year ended
December 31, 2005.
| | -- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | c. | Accounting for employee benefit plans. MEMCs finance and accounting personnel did not have adequate expertise in accounting for employee benefit plans to ensure the timely
identification of business events impacting the assumptions used to calculate benefit obligations. As a result, MEMC incorrectly reduced the projected benefit obligation by a material amount that would have reduced expense in future periods. This
deficiency contributed to the restatement of MEMCs consolidated financial statements for the first and second quarters of 2005 and resulted in errors in MEMCs consolidated financial statements for the third quarter of 2005 and as of and
for the year ended December 31, 2005.
| | -- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | d. | Other accounting matters. MEMCs finance and accounting personnel lacked sufficient US GAAP expertise to ensure that nonroutine transactions and other
accounting matters were properly reflected in MEMCs consolidated financial statements. As a result, MEMC failed to properly account for business interruption insurance recoveries, the deferral of certain labor costs, the receipt of a
government grant, the elimination of intercompany profits in inventory, the classification of short-term investments, and certain stock option compensation costs. This
| | -- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



22



---

| | deficiency contributed to the restatement of MEMCs consolidated financial statements for the first and second quarters of 2005 and the consolidated
statements of cash flows for the years ended December 31, 2004 and 2003, and resulted in errors in MEMCs consolidated financial statements for the third quarter of 2005 and as of and for the year ended December 31, 2005.
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | 3. | Inadequate Revenue Recognition Policies and Procedures. MEMC did not have adequate policies and procedures in place related to revenue recognition, and MEMC lacked
personnel with adequate expertise in revenue recognition criteria under US GAAP. Specifically, MEMC had inadequate policies and procedures to:
| | -- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. | Ensure that appropriate evidence of sales agreements with customers exists and that all aspects of sales agreements are considered in the determination of the appropriate
accounting,
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | b. | Effectively identify and analyze the terms of multiple element arrangements,
| | -- | ----------------------------------------------------------------------------



| | c. | Assess international shipping terms and identify bill and hold arrangements, and
| | -- | --------------------------------------------------------------------------------



| | d. | Identify terms in sales arrangements with customers that indicate such arrangements are consignments.
| | -- | -----------------------------------------------------------------------------------------------------



This deficiency resulted in a restatement of MEMCs consolidated financial statements for the first and second quarters
of 2005 and resulted in material errors in MEMCs consolidated financial statements for the third quarter of 2005 and as of and for the year ended December 31, 2005.



We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the
consolidated balance sheets of MEMC Electronic Materials, Inc. and subsidiaries as of December 31, 2005 and 2004, and the related consolidated statements of operations, stockholders equity (deficiency), and cash flows for each of the
years in the three-year period ended December 31, 2005. The aforementioned material weaknesses were considered in determining the nature, timing, and extent of audit tests applied in our audit of the 2005 consolidated financial statements, and
this report does not affect our report dated August 10, 2006, which expressed an unqualified opinion on those consolidated financial statements.



In our opinion, managements assessment that the Company did not maintain effective internal control over financial reporting as of December 31,
2005 is fairly stated, in all material respects, based on criteria established in Internal Control  Integrated Framework, issued by COSO. Also, in our opinion, because of the effect of the material weaknesses described above on the
achievement of the objectives of the control criteria, the Company has not maintained effective internal control over financial reporting as of December 31, 2005 based on criteria established in Internal Control  Integrated
Framework, issued by COSO.



/s/ KPMG LLP



St. Louis, Missouri

August 10, 2006



23



---

|(d) | Remediation Activities
|--- | ----------------------



We have adopted and are in the process of implementing various measures in connection with our remediation of the material weaknesses noted above and our
ongoing efforts to improve our internal control processes and corporate governance. In the fall of 2005, our Audit Committee undertook a review of revenue recognition issues related to our polysilicon sales. This review is now complete and the
resolution of issues related to our accounting for revenue recognition is reflected in our interim and annual financial statements for fiscal 2005. The Audit Committees review yielded information beneficial to our efforts to improve our
internal control over financial reporting, including our control environment, as well as our disclosure controls and procedures. As a result of the Audit Committees review, we instituted improvements and some measures are planned for the third
and fourth quarter of 2006. Some of the now completed measures include:



| |  |  | Appointment of senior finance and accounting personnel with substantial accounting and public company financial expertise;
| | - |  | --------------------------------------------------------------------------------------------------------------------------



| |  |  | Enhancement of the accounting, corporate tax and internal audit functions by increasing the number of adequately trained personnel capable of anticipating and identifying risks
critical to financial reporting;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Establishment of Sales and Marketing finance roles within the accounting and finance organization for the purpose of reviewing sales arrangements; and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Adoption of policies and procedures and the implementation of controls designed to ensure that we account for revenue recognition, income taxes and other complex accounting matters
in accordance with US GAAP.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(e) | Changes in Internal Control Over Financial Reporting
|--- | ----------------------------------------------------



There were no changes in the Companys internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) during
the fiscal quarter ended December 31, 2005 that have materially affected, or are reasonably likely to materially affect, the Companys internal control over financial reporting. During 2006, the Companys management has initiated the
steps outlined above under Remediation Activities.



|Item 9B. | Other Information
|-------- | -----------------



None.



24



---

PART III



|Item 10. | Directors and Executive Officers of the Registrant
|-------- | --------------------------------------------------



Directors of the Registrant



Peter Blackmore, Director since 2006 (current term expiring 2008), Age 59



Mr. Blackmore has served as Executive Vice President of Unisys Corporation since February 2005. From 1991 through August 2004, Mr. Blackmore
served in various roles at Compaq Computer Corporation, or Compaq, and Hewlett-Packard Company, or HP, most recently as Executive Vice President of the Customer Solutions Group at HP from May 2004 through August 2004, and as Executive Vice President
of the Enterprise Systems Group at HP from 2002 through May 2004. Prior to the merger of Compaq and HP, Mr. Blackmore served as Senior Vice President of Worldwide Sales and Service of Compaq from 2000 through 2002 and Senior Vice President of
Worldwide Sales and Marketing of Compaq from 1998 through 2000.



Robert J.
Boehlke, Director since 2001 (current term expiring 2006), Age 65



Mr. Boehlke was most recently Executive Vice President and Chief Financial Officer of KLA-Tencor, a position he held from 1990 until his retirement in 2000. Between 1983 and 1990, he held a variety of management positions with that
company. KLA-Tencor is a supplier of process control and yield management solutions for the semiconductor manufacturing industry. Mr. Boehlke is a member of the Board of Directors of Tessera Technologies, Inc.



Nabeel Gareeb, Director since 2002 (current term expiring 2008), Age 41



Mr. Gareeb joined MEMC as President and Chief Executive Officer in
April 2002. Prior to joining MEMC, Mr. Gareeb was the Chief Operating Officer of International Rectifier Corporation, a leading supplier of power semiconductors, where he was responsible for worldwide operations, research and development and
marketing of the core products of the company. He joined International Rectifier in 1992 as Vice President of Manufacturing and subsequently held other senior management positions. Mr. Gareebs employment agreement with MEMC, which expired
by its terms on April 8, 2006, provided that MEMC would cause the Board of Directors to nominate him for election to our Board of Directors. The Company intends to negotiate a new employment agreement with Mr. Gareeb.



John Marren, Director since 2001 (current term expiring 2007), Age 43



Mr. Marren has been Chairman of the Board of Directors of MEMC since
November 2001. Mr. Marren has been a Partner of Texas Pacific Group, a privately held investment firm, since April 2000. Mr. Marren serves on the Board of Directors of Conexant Systems, Inc. and ON Semiconductor Corporation.



C. Douglas Marsh, Director since 2001 (current term expiring 2006), Age 61



Mr. Marsh was most recently Vice President Business
Integration & U.S. Institutional Investor Relations of ASML US, Inc., a supplier of photolithography equipment to the semiconductor industry, a position he held from 2000 until his retirement in April 2004. From 1991 to 2000, Mr. Marsh
held a variety of executive management positions with ASML. Mr. Marsh serves on the Board of Directors of ATMI, Inc.



William E. Stevens, Director since 2001 (current term expiring 2007), Age 63



Mr. Stevens has served as Chairman of BBI Group, Inc., a private equity investment firm, since November 2000.
Mr. Stevens served as Chairman and Chief Executive Officer of the Wesmark Group from 1999 to 2001. Mr. Stevens serves on the Board of Directors of McCormick & Company, Incorporated.



25



---

James B. Williams, Director since 2003 (current term expiring 2007), Age 50



Mr. Williams is a Partner of Texas Pacific Group, a privately held
investment firm. Mr. Williams joined Texas Pacific Group in February 1999. Mr. Williams also is a member of the board of directors of several private companies.



Executive Officers of the Registrant



The following is information concerning our executive officers as of June 30, 2006.



|                  |  |     |  |                                                        
|----------------- |  | --- |  | -------------------------------------------------------
|Name              |  | Age |  | All Positions and Offices Held                         
|Nabeel Gareeb     |  | 41  |  | President, Chief Executive Officer and Director        
|Kenneth H. Hannah |  | 37  |  | Senior Vice President and Chief Financial Officer      
|Sean Hunkler      |  | 44  |  | Senior Vice President, Manufacturing                   
|John A. Kauffmann |  | 50  |  | Senior Vice President, Sales and Marketing             
|Shaker Sadasivam  |  | 46  |  | Senior Vice President, Research and Development        
|Thomas J. Higgins |  | 49  |  | Senior Vice President, Human Resources                 
|Bradley D. Kohn   |  | 37  |  | Vice President, General Counsel and Corporate Secretary



Mr. Gareeb has
been our President and Chief Executive Officer since April 2002 and has been a Director since that time. Prior to joining MEMC, Mr. Gareeb was Chief Operating Officer of International Rectifier Corporation, a leading supplier of power
semiconductors. Mr. Gareeb joined International Rectifier in 1992 as Vice President of Manufacturing and subsequently held other senior management positions.



Mr. Hannah joined us as Senior Vice President and Chief Financial Officer in April 2006. Prior to joining MEMC,
Mr. Hannah was employed by The Home Depot, Inc. from 2003 to 2006. Mr. Hannah most recently served as the Senior Vice President, Operations, covering all aspects of The Home Depots operations in the United States, Mexico, and Canada.
Prior to that, he served as Senior Vice President, Finance, supporting all Home Depot stores in the United States and Mexico, as well as store operations and the global supply chain. Before Home Depot, from 2001 to 2003 Mr. Hannah worked as
Vice President for The Boeing Company where he led the audit and financial planning functions. He also held senior finance positions at several GE divisions from 1997 to 2001.



Mr. Hunkler joined us in August 2005 as Senior Vice President, Manufacturing. Prior to MEMC, from June 1984 to July
2005, Mr. Hunkler worked for Freescale Semiconductor (previously Motorola (Semiconductor Products Sector)), where he was in charge of Final Manufacturing and, before that, Worldwide Wafer Fab Operations.



Mr. Kauffmann has been our Senior Vice President, Sales and Marketing
since October 2004. Mr. Kauffmann served as Vice President, Marketing from August 2003 to October 2004 and Acting Vice President, Sales and Marketing from March 2003 to August 2003. Mr. Kauffmann served as our Director, Segment Marketing
from August 2002 to February 2003 and as the Commercial Manager for our 300 millimeter business unit from June 2000 to July 2002. From September 1994 to May 2000, Mr. Kauffmann held various positions with MEMC in Taiwan including Technical
Director from September 1994 to December 1997, Director of Operations from December 1997 to April 1999, and Director, Foundry Marketing from April 1999 to May 2000. From February 1980 to August 1994, Mr. Kauffmann held manufacturing positions
in one of our U.S. manufacturing plants.



Dr. Sadasivam
has been our Senior Vice President, Research and Development since July 2002. Dr. Sadasivam was President of MEMC Japan Ltd., our Japanese subsidiary, from April 2002 to June 2002. From July 2000 to March 2002, Dr. Sadasivam served as our
Director, Worldwide Operations Technology. Dr. Sadasivam was Director, Technology for MEMC Korea Company, our South Korean subsidiary, from July 1999 to June 2000. From September 1997 to June 1999, Dr. Sadasivam held positions in the
manufacturing technology group for our St. Peters facility.



26



---

Mr. Higgins joined MEMC in January 2006 as Senior Vice President, Human Resources. From 2000 to
2004, Mr. Higgins was Corporate Vice President, Human Resources, of Thyssen Krupp Elevator Corporation, North America. In 2005, Mr. Higgins ran his own human resources consulting company.



Mr. Kohn joined MEMC in September 2005 as Vice President, General
Counsel and Corporate Secretary. Prior to joining MEMC, from March 2000 until September 2005, Mr. Kohn was with Pillsbury Winthrop Shaw Pittman LLP (formerly Pillsbury Madison & Sutro LLP) in its Palo Alto office, most recently as a
partner in the Corporate Securities Group.



There are no family
relationships between or among any of the named officers and the directors.



Audit Committee Financial Experts



Our Board
of Directors has a standing audit committee established in accordance with Section 3(a)(58)(A) of the Securities Exchange Act of 1934. Mr. Stevens, Mr. Boehlke and Mr. Marsh, each of whom is independent, are the members of our
Audit Committee. The Board of Directors has determined that each of Mr. Boehlke and Mr. Stevens is an audit committee financial expert within the meaning of the rules and regulations adopted by the Securities and Exchange
Commission and the New York Stock Exchange.



Section 16(a) Beneficial
Ownership Reporting Compliance



Based solely on our review
of filed Forms 3, 4 and 5, all of the filings for our executive officers and directors and greater than 10% stockholders required under Section 16(a) of the Securities Exchange Act of 1934 were made on a timely basis in 2005, except that two
officers filed late, reporting one purchase transaction (but not sale transaction) each.



Code of Business Conduct



Our Board of Directors has adopted corporate governance guidelines. The Board has also adopted a code of business conduct applicable to all of our directors, officers and employees. The corporate governance guidelines and the code of
business conduct are posted on our website at www.memc.com. Copies of the corporate governance guidelines and code of business conduct are also available in print at no charge to any stockholder who requests them by writing to the Director of
Investor Relations at MEMC Electronic Materials, Inc., 501 Pearl Drive (City of OFallon), St. Peters, Missouri 63376.



27



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Item 11.Executive Compensation



SUMMARY COMPENSATION TABLE



|                                                                       |  |              |  |                       |  |                      |  |                               |        |  |                                                                 |  |                              |    
|---------------------------------------------------------------------- |  | ------------ |  | --------------------- |  | -------------------- |  | ----------------------------- | ------ |  | --------------------------------------------------------------- |  | ---------------------------- | ---
|Name and Principal Position                                            |  | Year         |  | Salary($) (1)         |  | Bonus($) (2)         |  | Other Annual Compensation ($) |        |  | Long-Term Compensation Awards Securities Underlying Options (#) |  | All Other Compensation($)(3) |    
|Nabeel Gareeb Chief Executive Officer and President                    |  | 200520042003 |  | 610,000593,337568,756 |  | 0635,000555,000      |  | 16,054                       | (4)    |  | 1,150,000150,000150,000                                         |  | 13,02012,71012,400           |    
|                                                                       |  |              |  |                       |  |                     
|Thomas E. Linnen (5) Senior Vice President and Chief Financial Officer |  | 200520042003 |  | 322,115296,53819,423  |  | 87,300156,038       |  | 30,034153,432                 | (4)(6) |  | 90,00013,400300,000                                             |  | 4,2004,100388                |    
|                                                                       |  |              |  |                       |  |                     
|Shaker Sadasivam Senior Vice President, Research and Development       |  | 200520042003 |  | 296,077237,231210,000 |  | 64,700127,16940,600  |  |                               |        |  | 65,00052,10066,000                                              |  | 13,0209,70710,248            |    
|                                                                       |  |              |  |                       |  |                     
|John A. Kauffmann (7) Senior Vice President, Sales and Marketing       |  | 200520042003 |  | 300,000248,769208,333 |  | 120,300138,36852,400 |  |                               |        |  | 30,000186,200130,000                                            |  | 12,60010,25010,000           |    
|                                                                       |  |              |  |                       |  |                     
|Sean Hunkler (8) Senior Vice President, Manufacturing                  |  | 2005         |  | 127,885               |  | 63,942               |  | 25,573                        | (4)    |  | 300,000                                                         |  | 177,558                      | (9)

---

|(1) | Amounts shown include cash compensation earned and received as well as cash compensation earned but deferred at the election of the executive officer under the MEMC Retirement
Savings Plan.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | Amounts shown consist of cash incentive bonuses under a cash incentive bonus plan.
|--- | ----------------------------------------------------------------------------------

|(3) | Amounts shown represent contributions by MEMC to the MEMC Retirement Savings Plan.
|--- | ----------------------------------------------------------------------------------

|(4) | Amounts shown represent relocation payments.
|--- | --------------------------------------------

|(5) | Mr. Linnen became Senior Vice President on December 8, 2003 and Chief Financial Officer on January 1, 2004. He stepped aside as Senior Vice President and Chief
Financial Officer on April 27, 2006.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(6) | Amounts shown represents a signing bonus.
|--- | -----------------------------------------

|(7) | Mr. Kauffmann became Vice President, Marketing, on September 1, 2003 and Senior Vice President, Sales and Marketing on October 27, 2004.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------

|(8) | Mr. Hunkler joined MEMC on August 15, 2005 as Senior Vice President, Manufacturing.
|--- | -----------------------------------------------------------------------------------

|(9) | Amount shown represents a $175,000 signing bonus and $2,558 of contributions by MEMC to the MEMC Retirement Savings Plan.
|--- | -------------------------------------------------------------------------------------------------------------------------



28



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OPTION GRANTS IN LAST FISCAL YEAR



|                  |  |                                                      |           |                                                                                                   |                                                    |  |                      |  |                                |  |                             |  |                            
|----------------- |  | ---------------------------------------------------- | --------- | ------------------------------------------------------------------------------------------------- | -------------------------------------------------- |  | -------------------- |  | ------------------------------ |  | --------------------------- |  | ---------------------------
|                  |  | Individual Grants                                    |           | Potential Realizable Value at Assumed Annual Rates of Stock Price Appreciation for Option Term(1)
|Name              |  | Number ofSecuritiesUnderlyingOptions Granted (#) (2) |           |                                                                                                   | % of TotalOptionsGranted ToEmployees inFiscal Year |  | Exercise Price(S/Sh) |  | Expiration Date                |  | 5%($)                       |  | 10%($)                     
|Nabeel Gareeb     |  | 150,000500,000500,000                                | (3)(4)(5) |                                                                                                   | 4.0813.613.6                                       |  | 11.9311.9311.93      |  | 05/02/201505/02/201505/02/2015 |  | 1,125,4073,751,3563,751,356 |  | 2,852,0029,506,6749,506,674
|                  |  |                                                      |           |                                                                                                   |                                                    | 
|Thomas E. Linnen  |  | 50,00040,000                                         | (6)(7)    |                                                                                                   | 1.361.09                                           |  | 11.6317.65           |  | 02/16/201507/26/2015           |  | 365,702444,000              |  | 926,7611,125,182           
|                  |  |                                                      |           |                                                                                                   |                                                    | 
|Shaker Sadasivam  |  | 25,00040,000                                         | (6)(7)    |                                                                                                   | 0.681.09                                           |  | 11.6317.65           |  | 02/16/201507/26/2015           |  | 182,851444,000              |  | 463,3811,125,182           
|                  |  |                                                      |           |                                                                                                   |                                                    | 
|John A. Kauffmann |  | 10,00020,000                                         | (6)(7)    |                                                                                                   | 0.270.54                                           |  | 11.6317.65           |  | 02/16/201507/26/2015           |  | 73,140222,000               |  | 185,352562,591             
|                  |  |                                                      |           |                                                                                                   |                                                    | 
|Sean Hunkler      |  | 200,000100,000                                       | (8)(9)    |                                                                                                   | 5.442.72                                           |  | 18.0518.05           |  | 08/15/201508/15/2015           |  | 2,270,3101,135,155          |  | 5,753,4102,876,705         

---

|(1) | The dollar amounts under these columns are the result of calculations at the 5% and 10% rates set by the SEC and are not intended to forecast possible future appreciation, if any,
of MEMCs common stock price. If MEMCs common stock does not increase in value, then the option grants described in the table will be valueless.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | Options expire ten years from the date of grant. Upon termination of employment due to death or permanent disability, all stock options become immediately exercisable. In addition,
upon termination of employment by MEMC without cause or by the employee for good reason within two years following a change of control, except as the Compensation Committee may otherwise determine, all stock options will vest and become immediately
exercisable.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | Options vest and become exercisable at the rate of 25% per year on May 2, 2006, May 2, 2007, May 2, 2008 and May 2, 2009, respectively.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------

|(4) | Options vest and become exercisable on May 2, 2008. This grant was made by the Compensation Committee on May 2, 2005 as a retention incentive for Mr. Gareeb beyond
the term of his 2002 employment agreement.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(5) | Options vest and become exercisable on May 2, 2010. This grant was made by the Compensation Committee on May 2, 2005 as a retention incentive for Mr. Gareeb beyond
the term of his 2002 employment agreement.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(6) | Options vest and become exercisable at the rate of 25% per year on February 16, 2006, February 16, 2007, February 16, 2008 and February 16, 2009,
respectively.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------

|(7) | Options vest and become exercisable at the rate of 25% per year on July 26, 2006, July 26, 2007, July 26, 2008 and July 26, 2009, respectively.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------

|(8) | Options vest and become exercisable at the rate of 25% per year on August 15, 2006, August 15, 2007, August 15, 2008 and August 15, 2009,
respectively.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------

|(9) | Options vest and become exercisable on August 15, 2009.
|--- | -------------------------------------------------------



29



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AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR

AND FISCAL YEAR-END OPTION VALUES



|                  |  |                             |  |                |  |                                                                  |  |                                                            |  |             |  |              
|----------------- |  | --------------------------- |  | -------------- |  | ---------------------------------------------------------------- |  | ---------------------------------------------------------- |  | ----------- |  | -------------
|                  |  | Shares Acquired On Exercise |  | Value Realized |  | Number of Securities Underlying Unexercised Options at FY-End(#) |  | Value of Unexercised In-the-Money Options At FY-End ($)(1)
|Name              |  | (#)                         |  | ($)            |  | Exercisable                                                      |  | Unexercisable                                              |  | Exercisable |  | Unexercisable
|Nabeel Gareeb     |  | 1,137,500                   |  | 18,287,894     |  | 112,500                                                          |  | 2,500,000                                                  |  | 1,258,500   |  | 34,602,375   
|Thomas E. Linnen  |  | 0                           |  | 0              |  | 103,350                                                          |  | 300,050                                                    |  | 1,244,168   |  | 3,243,304    
|Shaker Sadasivam  |  | 17,500                      |  | 387,450        |  | 137,275                                                          |  | 178,325                                                    |  | 2,344,145   |  | 2,157,704    
|John A. Kauffmann |  | 10,000                      |  | 221,400        |  | 76,550                                                           |  | 269,650                                                    |  | 954,974     |  | 2,963,022    
|Sean Hunkler      |  | 0                           |  | 0              |  | 0                                                                |  | 300,000                                                    |  | 0           |  | 1,236,000    

---

|(1) | Based on a closing price at December 30, 2005 of $22.17.
|--- | --------------------------------------------------------



Pension Plan



MEMC sponsors the MEMC Pension Plan, a defined benefit pension plan which covered most U.S. employees of MEMC and its subsidiaries through the end of
2001. Effective January 2, 2002, the plan was amended to freeze the accrued benefit for employees who did not meet certain age and service criteria. In order to receive benefit accruals after January 2, 2002, a participant must have met
one of two criteria: 1) as of December 31, 2001, the participant was at least age 50 with 5 years of service; or, 2) the participant had at least 25 years of service as of December 31, 2001. Employees who joined MEMC after
December 31, 2001 are not eligible for coverage under the MEMC Pension Plan.



The basic benefit payable under the MEMC Pension Plan is determined based on a lump sum equal to 8% of a participants average total earnings (as defined below) up to one-half of the Social Security
wage base plus 12% of the participants average total earnings over one-half of the Social Security wage base, multiplied by the participants years of benefit service, less 2% of such amount for every year by which the current age of the
participant is less than age 65 (the Basic Formula). In addition to the normal annuity options, for some participants the benefit is also available in an immediate lump-sum distribution at termination of employment. None of our named
executive officers are covered by the Basic Formula.



Employees
who were participants in our former Pension Plan for Salaried Employees (the Salaried Plan), a prior plan merged into the MEMC Pension Plan as of December 31, 1996, are entitled to a benefit calculated under the formula in effect as
of such date under the Salaried Plan, if such benefit is greater than the benefit calculated under the Basic Formula. The basic benefit payable under the Salaried Plan formula is a single life annuity equal to 1.2% of the participants average
total earnings multiplied by the participants years of benefit service. However, if the participant was hired in the U.S. by Monsanto Company (Monsanto), a prior owner of a substantial part of our business, before April 1,
1986 and was employed by us at any time during the period April 1, 1989 through May 31, 1989, or if the participant was employed by MEMC at any time during the period January 1, 1989 through March 31, 1989, the factor is 1.4% of
the participants average total earnings instead of 1.2%. If a participant with either the 1.2% or 1.4% formula retires on or after age 55 but prior to age 65, his benefit will be reduced 1/4% for each month that his retirement date
precedes his 65th birthday. However, if the participant is under age 65 but at least age 55 at the time of his retirement, and the participants age and years of vesting service add up to at least 80, then the benefit is not subject to any
reduction. The basic benefit under either the 1.2% or 1.4% formula is reduced by the amount the participant is entitled to receive under any other designated Monsanto defined benefit pension plan. For purposes of the MEMC Pension Plan, average
total earnings means twelve times the greater of (a) the monthly average earnings received in the 36 full calendar months immediately prior to the date of employment termination or (b) the monthly average of earnings received during
the highest three of the ten calendar years immediately prior to the year in which employment terminates. Earnings means amounts paid to participants that are subject to federal income tax withholding (including salary and bonus
payments), subject to certain adjustments. Generally, earnings utilized for pension formula purposes includes salary and bonus reported in the salary and bonus columns of the Summary Compensation



30



---

Table. However, since all or portions of the cash incentive bonuses are paid in the year following the year earned, all or a portion of such bonuses are
included in earnings utilized for pension formula purposes in the year following the year such bonuses are reported in the bonus column of the Summary Compensation Table.



Retirement benefits payable under qualified defined benefit plans are subject to the annual pension limitations imposed
under Section 415 of the Internal Revenue Code, for which limitations vary annually. The Section 415 limitation for 2004 is $165,000. In addition, Section 401(a)(17) of the Internal Revenue Code specifies a maximum amount of annual
compensation, also adjusted annually, that may be taken into account in computing benefits under a qualified defined benefit plan. The Section 401(a)(17) limitation for 2004 was $205,000. Our Supplemental Executive Pension Plan (the MEMC
SEPP), a non-qualified and unfunded plan, provided benefits over the applicable Internal Revenue Code limitations. Benefits under the MEMC SEPP are payable in the form of a lump-sum distribution, in the form of an annuity with monthly payments
for life beginning at the participants retirement age, or in annual installments not to exceed fifteen years. The MEMC SEPP was amended at the end of 2001 to cease future accruals. In addition, all accrued benefits under the MEMC SEPP for
employees who entered into new employment contracts with MEMC in 2001 were waived. None of our named executive officers participate in the MEMC SEPP.



The following table shows the estimated annual pension benefits under the MEMC Pension Plan in the remuneration and years of service classifications
indicated using the 1.4% Salaried Plan formula described above. As discussed above, the 1.4% formula is an alternative to the Basic Formula. The amounts shown in the table assume that a participant met the criteria for continued benefit accrual. In
addition, the amounts shown in the table are calculated on a single life annuity basis and assume retirement at age 65 (without regard to the offsets described above). No amounts are shown for more than twenty-five years of service or at
remuneration levels above $200,000 because none our named executive officers can reach these years of service categories or remuneration levels for purposes of determining benefits under the MEMC Pension Plan.



Pension Plan Table(1)



|             |  |                  |        |    |   |        |  |   |       
|------------ |  | ---------------- | ------ | -- | - | ------ |  | - | ------
|             |  | Years of Service
|Remuneration |  | 15               |        | 20 |   | 25    
|$125,000     |  | $                | 26,250 |    | $ | 35,000 |  | $ | 43,750
|150,000      |  |                  | 31,500 |    |   | 42,000 |  |   | 52,500
|175,000      |  |                  | 36,750 |    |   | 49,000 |  |   | 61,250
|200,000      |  |                  | 42,000 |    |   | 56,000 |  |   | 70,000



Mr. Kauffmann is
covered by the 1.4% formula. Mr. Kauffmann did not meet the criteria for continued benefit accrual effective December 31, 2001. As of December 31, 2001, Mr. Kauffmann had 22.0 years of benefit service and annualized average total
earnings of $108,414.



The following table shows the estimated
annual pension benefits under the MEMC Pension Plan in the remuneration and years of service classifications indicated using the 1.2% Salaried Plan formula described above. As discussed above, the 1.2% formula is an alternative to the Basic Formula.
The amounts shown in this table assume that a participant met the criteria for continued benefit accrual. In addition, the amounts shown in the table are calculated on a single life annuity basis and assume retirement at age 65 (without regard to
the offsets described above). No amounts are shown for more than fifteen years of service or at remuneration levels above $200,000 because none of our named executive officers can reach these years of service categories or remuneration levels for
purposes of determining benefits under the MEMC Pension Plan.



31



---

Pension Plan Table(2)



|             |  |                  |        |    |   |        |  |   |       
|------------ |  | ---------------- | ------ | -- | - | ------ |  | - | ------
|             |  | Years of Service
|Remuneration |  | 5                |        | 10 |   | 15    
|$125,000     |  | $                | 7,500  |    | $ | 15,000 |  | $ | 22,500
|150,000      |  |                  | 9,000  |    |   | 18,000 |  |   | 27,500
|175,000      |  |                  | 10,500 |    |   | 21,000 |  |   | 31,500
|200,000      |  |                  | 12,000 |    |   | 24,000 |  |   | 36,000



Dr. Sadasivam is
eligible for the 1.2% formula. Dr. Sadasivam did not meet the criteria for continued benefit accrual effective December 31, 2001. As of December 31, 2001, Dr. Sadasivam had 8.3 years of benefit service and annualized average
total earnings of $113,496.

Messrs. Gareeb, Linnen and Hunkler commenced employment after December 31, 2001. As a result, they do not
participate in the MEMC Pension Plan or MEMC SEPP.



REPORT OF
THE COMPENSATION COMMITTEE



The Compensation Committee of
the Board of Directors is responsible for the Companys executive compensation programs. This report is provided by the Committee to assist stockholders in understanding the philosophy and objectives underlying the compensation of MEMCs
senior executives.



Philosophy



MEMCs executive compensation programs are designed to attract and
retain the highest quality talent possible and also to provide incentives for them to enhance stockholder value. The Committee reviews the executive compensation programs at least annually to ensure that these goals and objectives are being met.



Guidelines



Compensation levels are established annually using guidelines developed by
internationally recognized compensation consultants. These guidelines are based upon survey data of comparable U.S. and international companies.



In 2005, the Committee primarily utilized the Radford U.S. Benchmark and U.S. Executive Compensation Surveys as our guideline for executive compensation,
although the Committee also utilized several other compensation survey data sources. For long-term equity incentive awards, we also considered the Towers Perrin Executive Compensation Survey Database, General Industry because Towers Perrin provides
data in some job categories that are not available from Radford. We believe the Radford surveys are commonly used by the semiconductor and high technology industries and more closely align our compensation structure with those of our competitors,
customers and suppliers with whom we compete for executive officers and employees. For purposes of determining the compensation for Mr. Gareeb, the Companys Chief Executive Officer, we also retained Fred Cook & Co., Inc. to
prepare a survey of base salaries, cash incentives and long-term equity incentives for chief executive officers of comparable companies within the semiconductor industry. We believed this survey would supplement the CEO compensation data within the
semiconductor industry that was available from Radford, Towers Perrin and the other survey data sources. To retain and attract key executives, the Committee generally utilizes a compensation guideline that targets base salaries, cash incentives and
long-term equity incentives for executive officers between the 50th and 75th percentile of the surveys.



Our 2005 executive compensation program consisted of three components: (1) base salaries, (2) cash incentive awards, and (3) long-term
equity incentive awards.



32



---

Base Salaries



The Committee reviews the base salary of each executive officer on an annual basis and more frequently when necessary to make adjustments based on changes
in individual roles and responsibilities and personal performance levels. In making base salary decisions, the Committee reviews comparable salary data from the compensation surveys. In addition, the Committee considers other factors such as
personal performance and level of contribution. For 2005, the Committee used an overall compensation guideline that targeted base salaries for executive officers between the 50th and 75th percentile of companies included in the compensation surveys.



In 2005, the Committee deferred its decision regarding any
changes to the base salary for Mr. Gareeb, the Companys Chief Executive Officer. As a result, Mr. Gareeb did not receive an increase in his annual base salary from the 2004 level.



Cash Incentive Awards



Participation in the cash incentive plan is discretionary as determined by the Committee and the plan is non-contractual.
Under current practice, the Committee awards cash incentives under the plan to executive officers to recognize and reward individual and corporate performance.



In 2005, the Committee established target and maximum bonuses (as a percentage of base salary) for each designated participant. For 2005, the Committee
used the compensation guidelines that targeted cash incentives for executive officers between the 50th to 75th percentile of the survey data. The 2005 cash incentive award for each executive officer other than Mr. Gareeb was based on a number
of individual performance and financial objectives applicable to each executive officers functional area, certain financial objectives for the Company, as well as the performance objectives established for Mr. Gareeb. These objectives
were separately weighted for each person and were determined and evaluated on a quarterly, semi-annual and annual basis, but the incentives were generally paid semi-annually and annually.



For 2005, consistent with Mr. Gareebs employment agreement, the Committee established a target bonus level for
Mr. Gareeb of 80% of Mr. Gareebs annual base salary and a maximum bonus level of 140% of Mr. Gareebs annual base salary. Mr. Gareebs target award was based on the Companys overall financial performance,
the Companys achievement of certain strategic objectives, Mr. Gareebs achievement of certain individual performance objectives, and the cumulative achievement of those executive officers and management employees reporting to
Mr. Gareeb. The Committee deferred final decisions with respect to Mr. Gareebs 2005 bonus pending finalization of the financial statements for 2005 so that the Committee could evaluate whether the performance and strategic objectives
had been achieved.



Long-Term Equity Incentive Awards



In 2005, executive officers, other than Mr. Gareeb, generally received
semi-annual grants of non-qualified stock options having an exercise price equal to 100% of the market value of the Companys stock on the date of grant, which options vest ratably over four years. These option grants to the named executive
officers are reflected in the Option Grants in Last Fiscal Year table.



In making decisions regarding long-term equity incentive awards, the Committee first reviews the comparable stock option awards from the compensation surveys listed above. In addition, we consider certain other
factors such as personal performance, level of contribution, and the need to attract and retain executive officers. For 2005, we used an overall compensation guideline that targeted long-term equity incentives for executive officers at the 50th to
75th percentile of competitor companies.



Mr. Gareebs employment agreement provides for annual grants of stock options to purchase up to 150,000 shares of stock. For 2005, consistent with Mr. Gareebs employment agreement and after review of the Companys
overall performance, and in light of the Committees desire to retain Mr. Gareeb, the Committee



33



---

awarded Mr. Gareeb stock options to purchase an aggregate of 1,150,000 shares of stock in three separate grants on May 2, 2005. All three grants
were non-qualified stock options having an exercise price equal to 100% of the market value of the Companys stock on the date of grant. The first grant, for 150,000 shares, vests ratably over four years, and consistent with the intent of
Mr. Gareebs employment agreement and consistent with Company practice, was intended to be the annual grant contemplated by Mr. Gareebs employment agreement. The second and third grants are intended to be retention and
performance grants, and have a cliff vesting feature. The second grant, for 500,000 shares, vests and becomes exercisable on May 2, 2008. The third grant, for 500,000 shares, vests and becomes exercisable on May 2, 2010. Both
the second grant and third grant were made by the Compensation Committee as a retention incentive for Mr. Gareeb beyond the term of his 2002 employment agreement, which expired by its terms on April 8, 2006. The Company intends to
negotiate a new employment agreement with Mr. Gareeb. All three of these option grants to Mr. Gareeb are reflected in the Option Grants in Last Fiscal Year table.



Members of the Compensation Committee (2005)



James B. Williams, Chairman

Robert J. Boehlke

John Marren (through May 18, 2005)

C. Douglas Marsh



Director Compensation



Under our director compensation policy, outside directors receive the following fees for their service on the Board of
Directors and its Committees:



| |  |  | $40,000 annual Board of Directors cash retainer
| | - |  | -----------------------------------------------



| |  |  | $10,000 additional cash retainer for Chairman of the Board of Directors
| | - |  | -----------------------------------------------------------------------



| |  |  | $10,000 additional cash retainer for Chairman of the Audit Committee and $5,000 additional cash retainer for each member of the Audit Committee
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | $5,000 additional cash retainer for Chairman of the Compensation Committee
| | - |  | --------------------------------------------------------------------------



| |  |  | $5,000 additional cash retainer for the Chairman of the Nominating and Corporate Governance Committee
| | - |  | -----------------------------------------------------------------------------------------------------



| |  |  | $1,000 cash for each Board of Directors meeting and each Committee meeting attended.
| | - |  | -------------------------------------------------------------------------------------



In addition, the director compensation policy provides for annual equity compensation grants as follows:



| |  |  | Upon initial election to the Board of Directors, outside directors who are not affiliated with Texas Pacific Group, Leonard Green & Partners and TCW/Crescent Mezzanine
Management III LLC receive a grant of non-qualified stock options to purchase 30,000 shares of MEMC common stock at an exercise price per share equal to the fair market value per share on the date of grant. These options vest ratably over three
years. The grant of these stock options in the initial year of service on the Board of Directors is in lieu of the award of restricted stock units (RSUs) described below.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Outside directors are awarded RSUs for shares of our common stock on an annual basis. The RSUs vest ratably over two years. Each year, RSUs are to be awarded in an amount such that
the number of underlying shares of MEMC common stock has a total value of $60,000 on the date the award is granted. On March 14, 2006, we awarded to each of Messrs. Boehlke, Marren, Marsh, Stevens and Williams 3,400 RSUs for 2005 compensation.
Fifty percent (50%) of these RSUs will vest on July 26, 2006 and the remaining fifty percent (50%) will vest on July 26, 2007.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



34



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Employment Agreements



Nabeel Gareeb



In connection with Mr. Gareebs appointment as our President and Chief Executive Officer on April 30, 2002, we entered into an employment
agreement with Mr. Gareeb effective as of March 26, 2002. The employment agreement provided that Mr. Gareeb would serve as our President and Chief Executive Officer for an initial four-year term ending April 8, 2006. The
employment agreement also provided that MEMC would cause its Board of Directors to nominate Mr. Gareeb for election to our Board of Directors. This employment agreement expired by its terms on April 8, 2006, and has not yet been renewed or
extended by the Company. The Company intends to negotiate a new employment agreement with Mr. Gareeb.



Mr. Gareebs employment agreement, which was effective for all of fiscal 2005, included the following provisions:



| |  |  | An initial annual base salary of $550,000, which was to be reviewed annually and could be adjusted by the Board, provided, however, such base salary could not be decreased unless
such decrease was part of a base salary reduction applicable to a broad class of management employees
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | An annual bonus opportunity, the terms and conditions of which were to be determined by the Board, with a target bonus of 70% of annual base salary and a maximum bonus of 123% of
base salary in 2002, which bonus was to be pro-rated for Mr. Gareebs actual months of service in 2002, and a target of 80% of annual base salary and a maximum bonus of 140% of base salary in 2003 (See REPORT OF THE COMPENSATION
COMMITTEECash Incentive Awards)
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Participation in our employee benefit plans as maintained by MEMC from time to time and generally available to senior executives
| | - |  | --------------------------------------------------------------------------------------------------------------------------------



| |  |  | A $100,000 payment to defray expenses incurred by Mr. Gareeb in relocating to the St. Peters, Missouri area
| | - |  | -----------------------------------------------------------------------------------------------------------



| |  |  | Reimbursement of reasonable moving and closing costs in accordance with MEMCs relocation policies in the event Mr. Gareeb purchased a residence in the St. Peters,
Missouri area prior to April 8, 2003
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Reimbursement of the cost of temporary accommodations incurred by Mr. Gareeb during the first six months of his employment up to a maximum of $20,000
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------



The employment agreement also provided for certain grants of stock options
to purchase MEMC common stock. After 2002, the employment agreement provided for annual grants of options to purchase shares of MEMC common stock in accordance with MEMCs annual stock option grant program, provided that it was anticipated that
Mr. Gareeb would be eligible to receive a grant of an option to purchase up to 150,000 shares of MEMC stock for each of calendar year 2003, 2004 and 2005. Mr. Gareeb received such an option grant in 2003, 2004 and 2005.



Either party could terminate Mr. Gareebs employment agreement. In
the event of Mr. Gareebs involuntary termination without cause (other than by reason of death or disability) or Mr. Gareebs voluntary termination for good reason during the employment term, he was entitled to:



| |  |  | His base salary through the date of termination
| | - |  | -----------------------------------------------



| |  |  | His annual bonus, if any, earned in the calendar year immediately preceding the calendar year in which the date of termination occurs, to the extent not yet paid
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Subject to the execution by Mr. Gareeb of a general release and waiver, the continuation of Mr. Gareebs base salary for the two-year period beginning on the date of
termination.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Other Employment Arrangements
with Executive Officers



Each of our named executive
officers, other than Mr. Gareeb, is an employee at will without a written employment agreement. The Compensation Committee adjusts their base salary compensation from time to time



35



---

as the Compensation Committee deems appropriate, generally annually. The executive officers also receive cash incentive awards as determined by the
Compensation Committee pursuant to the MEMC Cash Incentive Plan Covering Executive Officers.



Change in Control



The
Companys stock option plans and certain award agreements under such plans provide for acceleration of vesting in the event of a change in control of MEMC and/or in the event of termination of employment by MEMC without cause or by the
participant for good reason within two years following a change in control of MEMC, as defined in those plans. Our named executive officers participate in these plans.



Compensation Committee Interlocks and Insider Participation



In 2005, the Compensation Committee was comprised of Messrs. Robert J. Boehlke, John Marren, C. Douglas Marsh and James B.
Williams. Messrs. Marren and Williams are partners with Texas Pacific Group. An investor group led by Texas Pacific Group currently beneficially owns approximately 25% of the outstanding shares of MEMC common stock, including all of the 4,677,276
outstanding warrants to purchase MEMC common stock. For a description of certain transactions and arrangements between MEMC and the investor group led by Texas Pacific Group, see Certain Relationships and Related Transactions below.



None of the directors comprising the Compensation Committee
during 2005 or 2006 has been an officer or employee of MEMC or any of its subsidiaries.



36



---

STOCK PRICE PERFORMANCE GRAPH



The graph below compares cumulative total stockholder return with the cumulative total return (assuming reinvestment of
dividends) of the S&P 500 Index and the S&P 500 Semiconductors Index. The information on the graph covers the period from December 31, 2000 through December 31, 2005. The stock price performance shown on the graph below is not
necessarily indicative of future stock price performance.



COMPARISON OF CUMULATIVE FIVE YEAR TOTAL RETURN



LOGO



|                       |  |              |  |              |  |              |  |              |  |              |  |             
|---------------------- |  | ------------ |  | ------------ |  | ------------ |  | ------------ |  | ------------ |  | ------------
|                       |  | December 31, |  | December 31, |  | December 31, |  | December 31, |  | December 31, |  | December 31,
|                       |  | 2000         |  | 2001         |  | 2002         |  | 2003         |  | 2004         |  | 2005        
|MEMC                   |  | 100          |  | 36.65        |  | 78.14        |  | 99.30        |  | 136.77       |  | 228.85      
|S&P 500                |  | 100          |  | 88.11        |  | 68.64        |  | 88.33        |  | 97.94        |  | 102.75      
|S&P 500 Semiconductors |  | 100          |  | 84.17        |  | 41.05        |  | 81.08        |  | 64.14        |  | 71.94       



37



---

|Item 12. | Security Ownership of Certain Beneficial Owners and Management
|-------- | --------------------------------------------------------------



BENEFICIAL OWNERSHIP

BY DIRECTORS AND EXECUTIVE OFFICERS



The following table lists the beneficial ownership of MEMC common stock as of June 30, 2006, based on 222,023,958 shares outstanding, by each of our directors, our named executive officers for 2005 and all
current directors and executive officers as a group. Except as indicated below, each person has the sole power to vote and transfer his or her shares or interests.



|                                                             |  |                                                        |        |  |                                         
|------------------------------------------------------------ |  | ------------------------------------------------------ | ------ |  | ----------------------------------------
|Name                                                         |  | Number of Shares of MEMCCommon StockBeneficially Owned |        |  | Percentage ofMEMCOutstandingCommon Stock
|Peter Blackmore                                              |  | 0                                                      |        |  | *                                       
|Robert J. Boehlke                                            |  | 43,500                                                 | (1)    |  | *                                       
|John Marren                                                  |  | 13,500                                                 | (1)    |  | *                                       
|C. Douglas Marsh                                             |  | 43,500                                                 | (1)    |  | *                                       
|William E. Stevens                                           |  | 44,700                                                 | (1)    |  | *                                       
|James B. Williams                                            |  | 13,500                                                 | (1)    |  | *                                       
|Nabeel Gareeb                                                |  | 1,387,500                                              | (1)(2) |  | *                                       
|Sean Hunkler                                                 |  | 50,000                                                 | (1)    |  | *                                       
|John A. Kauffmann                                            |  | 137,706                                                | (3)    |  | *                                       
|Thomas E. Linnen                                             |  | 129,200                                                | (1)    |  | *                                       
|Shaker Sadasivam                                             |  | 229,121                                                | (4)    |  | *                                       
|All directors and executive officers as a group (13 persons) |  | 1,963,027                                              | (5)    |  | *                                       

---

|*Represents | less than 1% of MEMCs outstanding common stock as of June 30, 2006.
|----------- | --------------------------------------------------------------------

|(1) | All of these shares may be acquired by the holder within 60 days of June 30, 2006, including 8,400 shares underlying restricted stock unit awards that each director, other than
Mr. Blackmore and Mr. Gareeb, could receive upon his resignation as a director.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | Shares or options are all held by The Nabeel Gareeb Trust II, over which Mr. Gareeb has sole power to vote and transfer such shares or interests.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | Includes 131,380 shares that may be acquired within 60 days of June 30, 2006.
|--- | -----------------------------------------------------------------------------

|(4) | Includes 218,050 shares that may be acquired within 60 days of June 30, 2006.
|--- | -----------------------------------------------------------------------------

|(5) | Includes 1,945,630 shares that may be acquired within 60 days of June 30, 2006.
|--- | -------------------------------------------------------------------------------



38



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OWNERSHIP OF MEMC EQUITY SECURITIES

BY CERTAIN BENEFICIAL OWNERS



The following table lists the persons known by us to beneficially own 5% or more of our common stock based on 222,023,958 shares outstanding as of June 30, 2006.



|                                                                                                     |  |                                          |     |  |               |  |                 |  
|---------------------------------------------------------------------------------------------------- |  | ---------------------------------------- | --- |  | ------------- |  | --------------- | -
|Name and Address of Beneficial Owner                                                                 |  | Amount and Nature ofBeneficial Ownership |     |  | Title ofClass |  | Percentof Class |  
|TPG Wafer Holdings LLC 301 Commerce Street, Suite 3300 Fort Worth, TX 76102                          |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                     |  |                                          |    
|TPG Wafer Partners LLC 301 Commerce Street, Suite 3300 Fort Worth, TX 76102                          |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                     |  |                                          |    
|TPG Wafer Management LLC 301 Commerce Street, Suite 3300 Fort Worth, TX 76102                        |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                     |  |                                          |    
|TPG Advisors III, Inc. 301 Commerce Street, Suite 3300 Fort Worth, TX 76102                          |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                     |  |                                          |    
|T(3) Advisors, Inc. 301 Commerce Street, Suite 3300 Fort Worth, TX 76102                             |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                     |  |                                          |    
|T(3) Advisors II, Inc. 301 Commerce Street, Suite 3300 Fort Worth, TX 76102                          |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                     |  |                                          |    
|Green Equity Investors III, L.P. 11111 Santa Monica Blvd., Suite 2000 Los Angeles, CA 90025          |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                     |  |                                          |    
|Green Equity Investors Side III, L.P. 11111 Santa Monica Blvd., Suite 2000 Los Angeles, CA 90025     |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                     |  |                                          |    
|GEI Capital III, LLC 11111 Santa Monica Blvd., Suite 2000 Los Angeles, CA 90025                      |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                     |  |                                          |    
|LGP Management, Inc. 11111 Santa Monica Blvd., Suite 2000 Los Angeles, CA 90025                      |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                     |  |                                          |    
|Leonard Green & Partners, L.P. 11111 Santa Monica Blvd., Suite 2000 Los Angeles, CA 90025            |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                     |  |                                          |    
|TCW/Crescent Mezzanine Partners III, L.P. 11100 Santa Monica Blvd., Suite 2000 Los Angeles, CA 90025 |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                     |  |                                          |    
|TCW/Crescent Mezzanine Trust III 11100 Santa Monica Blvd., Suite 2000 Los Angeles, CA 90025          |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %



39



---

|                                                                                                                 |  |                                          |     |  |               |  |                 |  
|---------------------------------------------------------------------------------------------------------------- |  | ---------------------------------------- | --- |  | ------------- |  | --------------- | -
|Name and Address of Beneficial Owner                                                                             |  | Amount and Nature ofBeneficial Ownership |     |  | Title ofClass |  | Percentof Class |  
|                                                                                                                 |  |                                          |    
|TCW/Crescent Mezzanine Partners III Netherlands, L.P. 11100 Santa Monica Blvd., Suite 2000 Los Angeles, CA 90025 |  | 56,153,802                               | (1) |  | Common        |  | 24.8            | %
|                                                                                                                 |  |                                          |    
|FMR Corp. 82 Devonshire Street Boston, MA 02109                                                                  |  | 25,906,800                               | (2) |  | Common        |  | 11.7            | %

---

|(1) | Based on information provided by TPG Wafer Holdings LLC (TPG Wafer Holdings) and contained in a Schedule 13D jointly filed with the Securities and Exchange Commission by
TPG Wafer Holdings, TPG Wafer Partners LLC (TPG Wafer Partners), TPG Advisors III, Inc., T(3) Advisors, Inc., T(3) Advisors II, Inc., Green Equity Investors III, L.P., Green Equity Investors Side III, L.P., GEI Capital III, L.L.C., LGP
Management, Inc., Leonard Green & Partners, L.P., TCW/Crescent Mezzanine Partners III, L.P., TCW/Crescent Mezzanine Trust III, The TCW Group, Inc., TCW Asset Management Company, TCW/Crescent Mezzanine III, LLC (the Joint Filers)
on November 23, 2001, Amendment No. 1 to such Schedule 13D filed by the Joint Filers and TCW/Crescent Mezzanine Partners III Netherlands, L.P. (TCW Netherlands) on January 31, 2002, Amendment No. 2 to such Schedule
13D filed by the Joint Filers and TCW Netherlands on August 9, 2002, Amendment No. 3 to such Schedule 13D filed by the Joint Filers and TCW Netherlands on September 30, 2002, Amendment No. 4 to such Schedule 13D filed by the
Joint Filers and TCW Netherlands on May 22, 2003, Amendment No. 5 to such Schedule 13D filed by the Joint Filers and TCW Netherlands on June 3, 2003, Amendment No. 6 to such Schedule 13D filed by the Joint Filers and TCW
Netherlands on September 19, 2003, Amendment No. 7 to such Schedule 13D filed by the Joint Filers and TCW Netherlands on February 17, 2004, Amendment No. 8 to such Schedule 13D filed by the Joint Filers and TCW Netherlands on
January 5, 2005, Amendment No. 9 to such Schedule 13D filed by the Joint Filers and TCW Netherlands on February 25, 2005 and Amendment No. 10 to such Schedule 13D filed by the Joint Filers and TCW Netherlands on August 23,
2005. Assumes the exercise in full of the warrants to purchase 4,677,276 shares of our common stock. TPG Wafer Holdings is the record owner of 50,870,526 shares of our common stock collectively held by the Joint Filers and TCW Netherlands. TPG Wafer
Partners is the record owner of 591,000 shares of our common stock and TPG Wafer Management LLC is the record owner of 15,000 shares of our common stock.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



TPG Wafer Holdings is a Delaware limited liability company the members of which are TPG Wafer Partners, TPG Wafer Management
LLC, Green Equity Investors III, L.P., Green Equity Investors Side III, L.P., TCW/Crescent Mezzanine Partners III, L.P., TCW/Crescent Mezzanine Trust III and TCW/Crescent Mezzanine Partners III Netherlands, L.P. (collectively, the
Members).



The Members have entered into the
Amended and Restated LLC Operating Agreement of TPG Wafer Holdings, dated as of November 13, 2001, and as amended on January 25, 2002, which provides that TPG Wafer Partners shall be the managing member of TPG Wafer Holdings and conduct
the business and affairs of TPG Wafer Holdings. This includes voting of the equity securities that TPG Wafer Holdings holds except as set forth herein. The Members have also entered into a Members Agreement, dated as of November 13, 2001
and as amended on January 25, 2002, providing for, among other things, an agreement by TPG Wafer Partners not to cause TPG Wafer Holdings to vote its shares of common stock without the prior written consent of the other parties to the LLC
Operating Agreement on certain matters. The Members Agreement also provides that TCW/Crescent Mezzanine Partners III, L.P., TCW/Crescent Mezzanine Trust III and TCW/Crescent Mezzanine Partners III Netherlands, L.P. may nominate one individual
to our Board of Directors, Green Equity Investors III, L.P. and Green Equity Investors Side III, L.P. may nominate one individual to our Board of Directors, and TPG Wafer Partners agrees to cause TPG Wafer Holdings to vote its shares of common stock
in favor of the election of such individuals as our directors.



David Bonderman, James G. Coulter and William S. Price, III are directors, officers and the sole shareholders of TPG Advisors III, Inc. (TPG Advisors III), which is the general partner of TPG GenPar



40



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III, L.P., which in turn is the sole general partner of each of TPG Partners III, L.P. (Partners III), TPG Parallel III, L.P. (Parallel
III), TPG Investors III, L.P. (Investors III), FOF Partners III, L.P. (FOF) and FOF Partners III-B, L.P. (FOF B) and the sole member of TPG GenPar Dutch, L.L.C., which is the general partner of TPG Dutch
Parallel III, C.V. (Dutch Parallel III). Mr. Bonderman, Mr. Coulter and Mr. Price are also directors, officers and the sole shareholders of T(3) Advisors, Inc. (T(3) Advisors), which is the general partner of
T(3) GenPar, L.P., which in turn is the sole general partner of each of T(3) Partners, L.P. (T(3) Partners), T(3) Parallel, L.P. (T(3) Parallel) and T(3) Investors, L.P. (T(3) Investors) and the sole member of
T(3) GenPar Dutch, L.L.C., which is the general partner of T(3) Dutch Parallel, C.V. (T(3) Dutch). In addition, Mr. Bonderman, Mr. Coulter and Mr. Price are also directors, officers and the sole shareholders of T(3)
Advisors II, Inc. (T(3) Advisors II), which is the general partner of T(3) GenPar II, L.P., which in turn is the sole general partner of each of T(3) Partners II, L.P. (T(3) Partners II) and T(3) Parallel II, L.P. (T(3)
Parallel II). Partners III, Parallel III, Investors III, FOF, FOF B, Dutch Parallel III, T(3) Partners, T(3) Parallel, T(3) Investors, T(3) Dutch, T(3) Partners II and T(3) Parallel II (collectively, the TPG Funds) are members of
TPG Wafer Partners, which in turn is a member of TPG Wafer Holdings, and also the managing member of TPG Wafer Management LLC (TPG Wafer Management). TPG Wafer Holdings directly holds the 50,870,526 shares of our common stock. TPG Wafer
Partners directly holds 591,000 shares of our common stock, warrants to purchase 2,764,271 shares of our common stock and a 59.1% membership interest in TPG Wafer Holdings. TPG Wafer Management directly holds 15,000 shares of MEMC common stock and
warrants to purchase 70,159 shares of our common stock. TPG Advisors III, T(3) Advisors and T(3) Advisors II may be deemed, pursuant to Rule 13d-3 under the Securities Exchange Act of 1934, as amended (the Exchange Act), to beneficially
own all of the securities held by TPG Wafer Holdings and TPG Wafer Partners. Mr. Bonderman, Mr. Coulter and Mr. Price, by virtue of their positions with TPG Advisors III, T(3) Advisors, and T(3) Advisors II, may be deemed to have
investment power and beneficial ownership with respect to the equity securities held by TPG Wafer Holdings and TPG Wafer Partners. Each of Mr. Bonderman, Mr. Coulter and Mr. Price disclaims beneficial ownership of such securities.



LGP Management, Inc. (LGPM) is the general
partner of Leonard Green & Partners, L.P. (LGP), which is an affiliate of GEI Capital III, L.L.C. (GEI Capital and, together with LGPM and LGP, the LGP Controlling Persons), which is the general partner
of Green Equity Investors III, L.P. (GEI) and Green Equity Investors Side III, L.P. (GEI Side). GEI and GEI Side, in the aggregate, own 19.7% of the membership interests in TPG Wafer Holdings. TPG Wafer Holdings directly
holds 50,870,526 shares of our common stock. GEI directly holds warrants to purchase 914,559 shares of our common stock and GEI Side directly holds warrants to purchase 6,864 shares of our common stock. LGPM, LGP and GEI Capital may be deemed,
pursuant to Rule 13d-3 under the Exchange Act, to share beneficial ownership of the securities held by TPG Wafer Holdings, and to beneficially own the warrants held by GEI and GEI Side. Jonathan D. Sokoloff, John G. Danhakl, Peter J. Nolan, Jonathan
A. Seiffer, John M. Baumer and Timothy J. Flynn, either directly (whether through ownership interest or position) or through one or more intermediaries, may be deemed to control the LGP Controlling Persons. By virtue of their positions with the LGP
Controlling Persons, Messrs. Sokoloff, Danhakl, Nolan, Seiffer, Baumer and Flynn may be deemed to share beneficial ownership of the securities held by TPG Wafer Holdings and to have investment power and beneficial ownership with respect to the
warrants held by GEI and GEI Side. However, each such individual disclaims beneficial ownership of such securities.



TCW/Crescent Mezzanine III, LLC (MEZZANINE LLC), a Delaware limited liability company, is the General Partner of TCW/Crescent Mezzanine
Partners III, L.P. (TCW Partners) and TCW/Crescent Mezzanine Partners III Netherlands, L.P. (TCW Netherlands) and the Managing Owner of TCW/Crescent Mezzanine Trust III (TCW Trust and, collectively, the TCW
Funds). TCW/Crescent Mezzanine Management III, LLC (Mezz Mgmt III) is the Investment Advisor of the TCW Funds, and has delegated all investment and voting discretion with respect to the securities owned by the TCW Funds to TCW
Asset Management Company, a California corporation and registered investment advisor (TAMCO), as Sub-Advisor. As a result, Mezz Mgmt III disclaims beneficial ownership of these securities. TCW (Mezzanine III), L.P. (Mezz III
LP), a Delaware limited partnership, is a member of MEZZANINE LLC



41



---

who may be deemed to control MEZZANINE LLC. TAMCO is the Sub-Advisor to the TCW Funds and the General Partner of Mezz III LP. TAMCO is wholly owned by The
TCW Group, Inc., a Nevada corporation (TCWG). By virtue of their roles as Sub-Advisor to the TCW Funds, and as the controlling shareholder of such Sub-Advisor, respectively, TAMCO and TCWG may be deemed to have beneficial ownership with
respect to the securities owned by the TCW Funds. Each of TAMCO and TCWG is controlled by its respective Board of Directors. TCWG, together with its direct and indirect subsidiaries, collectively constitute The TCW Group, Inc. business unit (the
TCW Business Unit). The TCW Business Unit is primarily engaged in the provision of investment management services. The ultimate parent company of TCWG is Societe Generale, S.A., a company incorporated under the laws of France
(SG). The principal business of SG is acting as a holding company for a global financial services group, which includes certain distinct specialized business units that are independently operated, including the TCW Business Unit. SG, for
purposes of the federal securities laws, may be deemed ultimately to control TCWG and the TCW Business Unit. SG, its executive officers and directors, and its direct and indirect subsidiaries (including all of its business units except the TCW
Business Unit), may beneficially own securities and such securities are not reported in this Table. In accordance with Exchange Act Release No. 34-39538 (January 12, 1998) and due to the separate management and independent operation of its
business units, SG disclaims beneficial ownership of our securities beneficially owned by the TCW Business Unit. Each member of the TCW Business Unit disclaims beneficial ownership of our securities beneficially owned by SG and any of SGs
other business units. TCW Partners, TCW Trust and TCW Netherlands, in the aggregate, own 19.7% of the membership interests in TPG Wafer Holdings and 921,423 warrants. TPG Wafer Holdings directly holds 50,870,526 shares of MEMC common stock.



|(2) | Based solely on information contained in a Schedule 13G/A jointly filed with the Securities and Exchange Commission by FMR Corp., Edward C. Johnson 3d and Fidelity
Management and Research Company on March 10, 2006. According to the filing, Fidelity Management & Research Company (Fidelity), a wholly-owned subsidiary of FMR Corp. and an investment adviser registered under
Section 203 of the Investment Advisers Act of 1940, is the beneficial owner of 21,947,600 shares of MEMC common stock as a result of acting as investment adviser to various investment companies registered under the Investment Company Act of
1940. Edward C. Johnson 3d and FMR Corp., through its control of Fidelity, and the funds each has sole power to dispose of the 21,947,600 shares owned by the funds. Members of the family of Edward C. Johnson 3d, Chairman of FMR Corp., are the
predominant owners, directly or through trusts, of Series B shares of common stock of FMR Corp., representing 49% of the voting power of FMR Corp. The Johnson family group and all other Series B shareholders have entered into a shareholders
voting agreement under which all Series B shares will be voted in accordance with the majority vote of Series B shares. Accordingly, through their ownership of voting common stock and the execution of the shareholders voting agreement, members
of the Johnson family may be deemed, under the Investment Company Act of 1940, to form a controlling group with respect to FMR Corp. Neither FMR Corp. nor Edward C. Johnson 3d, Chairman of FMR Corp., has the sole power to vote or direct the voting
of the shares owned directly by the Fidelity Funds, which power resides with the Funds Boards of Trustees. Fidelity carries out the voting of the shares under written guidelines established by the Funds Boards of Trustees. Fidelity
Management Trust Company, a wholly-owned subsidiary of FMR Corp. and a bank as defined in Section 3(a)(6) of the Securities Exchange Act of 1934, is the beneficial owner of 1,179,700 shares of MEMC common stock as a result of its serving as
investment manager of the institutional account(s). Edward C. Johnson 3d and FMR Corp., through its control of Fidelity Management Trust Company, each has sole dispositive power over 1,179,700 shares and sole power to vote or to direct the voting of
1,179,700 shares of MEMC common stock owned by the institutional account(s) as reported above. Fidelity International Limited (FIL) and various foreign-based subsidiaries provide investment advisory and management services to a number of
non-U.S. investment companies and certain institutional investors. FIL is the beneficial owner of 2,779,500 shares of MEMC common stock. A partnership controlled predominantly by members of the family of Edward C. Johnson 3d, Chairman of FMR Corp.
and FIL, or trusts for their benefit, owns shares of FIL voting stock with the right to cast approximately 38% of the total votes which may be cast by all holders of FIL voting stock. FMR Corp. and FIL are separate and independent corporate
entities, and their Boards of
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



42



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| | Directors are generally composed of different individuals. FMR Corp. and FIL are of the view that they are not acting as a group for purposes of
Section 13(d) under the Securities Exchange Act of 1934 (the 1934 Act) and that they are not otherwise required to attribute to each other the beneficial ownership of securities beneficially owned by the
other corporation within the meaning of Rule 13d-3 promulgated under the 1934 Act. Therefore, they are of the view that the shares held by the other corporation need not be aggregated for purposes of Section 13(d). However, FMR Corp. made the
Schedule 13G/A filing on a voluntary basis as if all of the shares are beneficially owned by FMR Corp. and FIL on a joint basis.
| | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Equity Compensation Plans



The following table summarizes certain information regarding MEMC securities that have been and may be issued pursuant to our equity compensation plans as
of December 31, 2005.



|                                                              |  |                                                                                                 |  |                                                                             |  |                                                                                                                                               
|------------------------------------------------------------- |  | ----------------------------------------------------------------------------------------------- |  | --------------------------------------------------------------------------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------
|                                                              |  | (a)                                                                                             |  | (b)                                                                         |  | (c)                                                                                                                                           
|Plan Category                                                 |  | Number of securities to be issued upon exercise of outstanding options, warrants and rights (1) |  | Weighted-average exercise price of outstanding options, warrants and rights |  | Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a))(1)
|Equity compensation plans approved by security holders        |  | 8,347,911 shares of common stock                                                                |  | $10.82                                                                      |  | 7,115,452 shares ofcommon stock                                                                                                               
|Equity compensation plans not approved by security holders(2) |  | 162,500 shares of common stock                                                                  |  | $1.50                                                                       |  | 0 shares ofcommon stock                                                                                                                       
|Total                                                         |  | 8,510,411 shares of common stock                                                                |  | $10.65                                                                      |  | 7,115,452 shares ofcommon stock                                                                                                               

---

|(1) | Number of shares is subject to adjustment for changes in capitalization for stock splits, stock dividends and similar events.
|--- | -----------------------------------------------------------------------------------------------------------------------------

|(2) | Represents a stock option grant agreement for a nonqualified stock option granted in March 2002 to Nabeel Gareeb to purchase 650,000 shares of common stock at an exercise price of
$1.50 per share. Of these shares, 487,500 have been issued upon exercise and 162,500 are currently vested but unexercised. These options expire on March 26, 2012.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|Item 13. | Certain Relationships and Related Transactions
|-------- | ----------------------------------------------



On September 30, 2001, an investor group led by Texas Pacific Group, including TPG Wafer Holdings LLC and funds managed by Leonard Green &
Partners, L.P. and TCW/Crescent Mezzanine Management III LLC (collectively, TPG), entered into a purchase agreement with E.ON and its affiliates (E.ON). Pursuant to the purchase agreement, on November 13, 2001, TPG Wafer Holdings and its
assignees purchased all of E.ONs debt in MEMC of approximately $910 million and all of E.ONs equity holdings in MEMC, representing approximately 72% of the outstanding shares of MEMC common stock.



In connection with and as a condition to closing the transactions
contemplated by the purchase agreement between E.ON and TPG, on November 13, 2001, we entered into a restructuring agreement with TPG Wafer Holdings under which we restructured approximately $860 million of our debt that was acquired by TPG
from E.ON. As part of the transactions contemplated by the purchase agreement and restructuring agreement, we also entered into certain agreements with TPG, as more fully described below.



In an effort to minimize conflicts of interest by members of our Board of Directors affiliated with TPG or other related
parties, the Audit Committee, or a special committee consisting entirely of independent directors, generally approves or ratifies any material transaction with a related party. A special committee approved the transaction described under
Restructuring Agreement, below.



43



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Restructuring Agreement



In connection with and as a condition of the closing of the transactions contemplated by the purchase agreement between TPG
and E.ON, on November 13, 2001, we entered into a restructuring agreement with TPG Wafer Holdings. Pursuant to the restructuring agreement, TPG restructured the debt acquired by TPG from E.ON and TPG committed to provide us with a $150 million
revolving credit facility. The revolving credit facility was subsequently replaced with a revolving credit facility from Citibank/UBS, guaranteed by TPG. TPG exchanged previously outstanding debt of approximately $860 million for 260,000 shares of
our Series A Cumulative Convertible Preferred Stock, $50 million in principal of our senior subordinated secured notes maturing in November 2007 and warrants to purchase 16,666,667 shares of our common stock. TPG also retained a Euro 55 million
note issued by our Italian subsidiary.



Ownership of MEMC
by TPG



On July 10, 2002, TPG converted all of
the outstanding shares of Series A Cumulative Convertible Preferred Stock into 125,010,556 shares of MEMC common stock. TPG sold 15,300,000, 34,000,000, 65,550,000 and 18,250,000 shares of MEMC common stock in public offerings in May
2003, February 2004, February 2005 and August 2005 respectively. As a result, TPG now owns or has the right to acquire, through exercise of the warrants, approximately 56 million shares of our common stock, which would represent
approximately 25% of our outstanding common stock.



Board
Representation



Prior to the February 2005 secondary
offering, by virtue of its stock ownership, TPG Wafer Holdings possessed the power to elect all of our directors through its beneficial ownership of a majority of our voting stock. The operating agreement for TPG Wafer Holdings provides that certain
affiliates of Leonard Green & Partners may collectively nominate one individual to our Board of Directors and certain affiliates of TCW/Crescent Mezzanine Management III LLC may collectively nominate one individual to our Board. Prior to
the February 2005 secondary offering, Jean-Marc Chapus, John G. Danhakl, Gene J. Frantz, John Marren and James B. Williams were members of the MEMC Board of Directors. Mr. Chapus is President of TCW/Crescent Mezzanine LLC. Mr. Danhakl is a
partner at Leonard Green & Partners, L.P. Messrs. Frantz, Marren and Williams are partners of Texas Pacific Group. After the February 2005 offering, Messrs. Chapus, Danhakl and Frantz resigned from our Board. Our Board currently consists of
seven directors, with two TPG-designated members. As a practical matter, as a result of its share ownership, TPG has the ability to influence the election and composition of our Board of Directors.



Director Compensation



Under our director compensation policy, all directors, including directors
affiliated with TPG, receive compensation for their service on our Board of Directors. In 2005, we paid $119,000 to certain entities affiliated with TPG for the Board and committee fees and retainers earned by the directors affiliated with such
entities. See Board Representation above.



Notes and Warrants



Under the terms of
the restructuring agreement, in November 2001, MEMC issued to TPG $50 million in principal amount of our senior subordinated secured notes due 2007. The notes were guaranteed by our domestic subsidiaries and bore interest at a rate of 8% (payment in
kind) in the first two years following issuance, 14% (payment in kind) in the third and fourth years following issuance and 14% (payment in kind with optional payment in cash at the request of the note holders) in the fifth and sixth years following
issuance. Payment in kind means that accumulated interest on the notes is added to the principal amount of the notes, instead of being paid in cash. As collateral under the notes, we pledged substantially all of our domestic assets,
including all of the capital stock of most of our domestic subsidiaries and 65% of the capital stock of certain of our foreign



44



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subsidiaries, but excluding any assets pledged to support third party debt. The notes and the related security interest were subordinate in priority and in
right of payment to the Citibank/UBS revolving credit agreement and the reimbursement agreement, which are described under Citibank/UBS Credit Agreement below, and to the TPG revolving credit agreement, which is described under
TPG Credit Agreement below. In addition, the notes and related indenture contained substantially the same loan covenants as the Citibank/UBS revolving credit agreement and the TPG revolving credit agreement which are described
under Citibank/UBS Credit Agreement and TPG Credit Agreement below. In 2004, the interest accrued on the notes totaled approximately $3.9 million.



On December 29, 2004, we amended the terms of the indenture for the notes to allow for the early redemption of the
notes without premium. On December 30, 2004, we redeemed the notes in full for approximately $67.7 million. In connection with the issuance of the notes, MEMC issued to TPG warrants entitling the holders to purchase an aggregate of 16,666,667
shares of MEMC common stock at an exercise price of $3.00 per share, subject to certain antidilution adjustments. In connection with the August 2005 secondary offering, TPG exercised 10,000,000 warrants and surrendered 1,989,391 additional warrants
as partial payment for the exercise price of the warrants. The remaining 4,677,276 warrants may be exercised, in whole or in part, at any time and from time to time until their expiration on November 13, 2011.



Registration Rights Agreement



We have entered into a registration rights agreement with TPG providing for
registration rights with respect to the warrants, the shares of common stock issuable upon exercise of the warrants and any shares of common stock owned or acquired by TPG (including the shares acquired by TPG from E.ON pursuant to their purchase
agreement and the shares of common stock acquired by TPG upon the conversion of the preferred stock). At such time as is requested by TPG, we have agreed to file with the Securities and Exchange Commission registration statements on Form S-3
covering resales of these registrable securities by the holders of the registrable securities. TPG currently beneficially owns 56,153,802 shares of our common stock, including the 4,677,276 warrants, all of which are covered by the registration
rights agreement.



Citibank/UBS Credit Agreement



In connection with the restructuring, TPG originally
established a five-year revolving credit facility pursuant to which the TPG lender parties committed to make available to us a line of credit in an aggregate amount of $150 million.



Subsequent to the original closing of the debt restructuring transactions, we made arrangements to replace the TPG revolving
credit facility with a substantially similar five-year revolving credit facility with an affiliate of Citibank, N.A. On December 21, 2001, we entered into the new Citibank credit facility which replaced the TPG credit facility. In April 2002,
Citibank assigned 50% of its interest in this credit facility to UBS AG. MEMC paid back the Citibank facility in full in July 2005, and terminated the Citibank facility at that time.



TPG Credit Agreement



On December 5, 2002, we entered into a $35 million five-year revolving credit facility with TPG. The interest rate under this TPG credit facility
was LIBOR plus 10% or an alternative base rate plus 9%. We agreed to pay TPG a commitment fee of 0.50% per annum on the unused amount of this TPG facility. The TPG credit facility was secured by substantially the same collateral that secured
the Citibank/UBS facility. As with the Citibank/UBS facility, our domestic subsidiaries guaranteed MEMCs obligations under the TPG facility. The TPG facility contained substantially the same covenants as the Citibank/UBS facility. The
commitments under the TPG credit facility were to terminate and any outstanding loans under the facility, together with any accrued interest thereon, would become due and payable upon the closing and funding of a debt or equity financing in which
the net proceeds to MEMC equaled or exceeded $100 million.



45



---

Under the terms of the TPG facility, in 2005 we paid TPG commitment fees of approximately $143,000. We
terminated the TPG facility in July 2005, and TPG released all its security interests in our assets.



Merger Agreement



Pursuant to an agreement and plan of merger, we have agreed to permit the merger of TPG Wafer Holdings with and into us at such time as TPG Wafer Holdings
shall determine. We will continue in existence as the surviving corporation. In connection with the merger, the members of TPG Wafer Holdings will convert their limited liability company interests in TPG Wafer Holdings into equivalent equity
securities of us held by TPG Wafer Holdings, plus common stock having a market value equal to the principal amount of the debt securities of MEMC held by TPG Wafer Holdings and the accrued but unpaid interest on such debt securities. The only equity
securities of MEMC currently held by TPG Wafer Holdings are shares of our common stock. TPG Wafer Holdings currently does not directly hold any debt of MEMC and has indicated it has no current intention to acquire debt of MEMC. Accordingly, if the
merger were consummated today, the members of TPG Wafer Holdings would convert their limited liability interests in TPG Wafer Holdings into the same number of shares of our common stock as is currently held by TPG Wafer Holdings. The merger is
subject to the approval of the members of TPG Wafer Holdings. The agreement and plan of merger was approved by our stockholders at a special stockholders meeting held on July 10, 2002.



TPG requested that we enter into the merger agreement to enable it to
distribute the MEMC securities held by TPG Wafer Holdings to its members in a tax efficient manner. The merger is not intended to have any material economic consequence for us or any of our stockholders (other than TPG Wafer Holdings). It is
expected that the merger will occur only in connection with such a distribution. If the merger is not effected and TPG Wafer Holdings elects to be treated as a corporation for tax purposes, TPG Wafer Holdings and its members may be disadvantaged
from a tax perspective on any future sale of the MEMC securities held by it because such a sale would subject TPG Wafer Holdings to tax on the gain from the sale and the members of TPG Wafer Holdings to tax on distributions made by TPG Wafer
Holdings to such members.



Management Advisory Agreement



In connection with the restructuring, we entered into
a management advisory agreement with TPG GenPar III, L.P., an affiliate of TPG. Pursuant to the agreement, TPG GenPar III was to provide management and financial advisory services to us as requested by our Board of Directors in exchange for a
management advisory fee of $2 million per annum, plus related out-of-pocket expenses and additional compensation if TPG GenPar III acts as a financial advisor to us for future transactions such as a merger or debt or equity financing. This
Management Advisory Agreement was terminated on March 24, 2005, effective as of December 31, 2004. Under the terms of the Management Advisory Agreement, we paid TPG management advisory fees of $600,000 in 2005, which fees related to 2004.



Tax Consistency Agreement



In 2001, following the closing of the transactions contemplated by the
purchase agreement and restructuring agreement, we entered into a tax consistency agreement with MEMC Holdings Corporation, TPG Wafer Partners LLC and TPG Wafer Holdings. This agreement sets forth the income tax elections to be made and the
anticipated U.S. federal income tax treatment of the transactions contemplated by the purchase agreement and the restructuring agreement.



Fees and Expenses



We are responsible for the payment of certain of TPGs expenses incurred in connection with its ownership of our securities and with the Citibank/UBS
credit facility and the TPG credit facility. In 2004, we reimbursed Leonard Green approximately $10,000 of expenses incurred by Leonard Green related to its ownership of our securities. There were no such fees paid to Leonard Green in 2005.



46



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Ownership Interest in TPG Wafer Management



Certain of our current and former executive officers have purchased limited
liability company membership interests in TPG Wafer Management, an investment limited liability company that owns a 1.5% participation membership interest in TPG Wafer Holdings. These membership interests are economic interests with no voting rights
and represent a total of approximately 48.3% of the interests in TPG Wafer Management and, therefore, indirectly, approximately 0.72% of the membership interests in TPG Wafer Holdings.



Additional membership interests in TPG Wafer Management may be issued to directors, executive officers and other service
providers of MEMC. In addition to its membership interest in TPG Wafer Holdings, TPG Wafer Management directly owns 15,000 shares of MEMC common stock and 70,159 of our warrants. In addition, TPG Wafer Management received approximately $1.0 million
of the proceeds from our redemption of the outstanding senior subordinated secured notes in December 2004, and $15,416,759 of the proceeds from the two secondary offerings of our common stock by TPG in 2005. Mr. Gareebs share of such
proceeds was approximately $203,000 in 2004 and $3,083,352 in 2005.Upon consummation of the merger described above, TPG Wafer Management would receive a proportionate amount of the shares of MEMC common stock in exchange for its 1.5%
membership interest in TPG Wafer Holdings. Assuming consummation of the merger on December 31, 2005, TPG Wafer Management would have received 763,058 shares of MEMC common stock.



Ownership Interest in TPG Wafer Partners



Two of our directors, Messrs. Boehlke and Marsh, have purchased limited liability company membership interests in TPG Wafer
Partners, an investment limited liability company that owns a 59.1% membership interest in TPG Wafer Holdings. These membership interests are economic interests with no voting rights. Messrs. Boehlke and Marsh each own (through family trusts)
approximately 0.9% of the interests in TPG Wafer Partners and, therefore, indirectly, approximately 0.53% of the membership interests in TPG Wafer Holdings.



In addition to its membership interest in TPG Wafer Holdings, TPG Wafer Partners owns 591,000 shares of MEMC common stock and 2,764,271 of our warrants.
In addition, TPG Wafer Partners received approximately $40.0 million of the proceeds from our redemption of our outstanding senior subordinated notes in December 2004, and $612,845,129 of the proceeds from the two secondary offerings of our common
stock by TPG in 2005. Mr. Boehlke and Mr. Marsh each received approximately $360,000 of such proceeds in 2004, and $5,521,123 of such proceeds in 2005. Upon consummation of the merger described above, TPG Wafer Partners will receive a
proportionate amount of the shares of MEMC common stock in exchange for its 59.1% membership interest in TPG Wafer Holdings. Assuming consummation of the merger on December 31, 2005, TPG Wafer Partners would have received 30,064,481 shares of
MEMC common stock.



As partial consideration for their
membership interests in TPG Wafer Partners, family trusts controlled by Messrs. Boehlke and Marsh have each deposited $1 million into escrow, with TPG Wafer Partners serving as escrow agent for the escrowed funds. The escrowed funds will be used to
satisfy Messrs. Boehlkes and Marshs respective portions of TPGs obligations in the event that TPG is required to make a payment on its guaranty of the now-terminated Citibank/UBS credit facility or in certain other circumstances.
In such event, TPG Wafer Partners, as escrow agent, will release from escrow Messrs. Boehlkes and Marshs respective portions of the amounts becoming payable to the lenders under the terms of the guaranty or to MEMC as part of the loan
under the replacement credit facility or otherwise, as applicable, in accordance with Messrs. Boehlkes and Marshs membership interests in TPG Wafer Partners.



47



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|Item 14. | Principal Accounting Fees and Services
|-------- | --------------------------------------



PRINCIPAL ACCOUNTING FIRM SERVICES AND FEES



The following table presents fees paid to KPMG LLP for services rendered during the last two fiscal years:



|                   |  |      |           |      |   |          
|------------------ |  | ---- | --------- | ---- | - | ---------
|                   |  | 2005 |           | 2004
|Audit fees         |  | $    | 3,593,000 |      | $ | 1,249,000
|Audit-related fees |  |      | 313,000   |      |   | 57,000   
|Tax fees           |  |      | 48,000    |      |   | 62,000   
|All other fees     |  |      | 49,000    |      |   | 81,000   



Audit fees consisted
principally of the annual audits of the financial statements of MEMC and its consolidated subsidiaries, including in 2004 and 2005 audit work related to our internal controls as required by Section 404 of the Sarbanes-Oxley Act of 2002.



Audit-related fees consisted principally of audits of
financial statements of certain employee benefit plans and reviews of SEC filings.



Tax fees consisted principally of tax compliance and consultation.



All other fees consisted principally of statutory compliance requirements of our Italian subsidiary and consultation on accounting issues related to
employee benefit plans.



The Audit Committee considered and
determined that the provision of non-audit services by KPMG LLP in 2005 was compatible with maintaining KPMG LLPs independence.



MEMC has adopted pre-approval policies and procedures requiring that the Audit Committee pre-approve all audit and non-audit services performed by
MEMCs independent auditors. Under the policy, some services may be pre-approved without consideration of specific case-by-case services, while others require the specific pre-approval of the Audit Committee. Annual audit services are subject
to the specific pre-approval of the Audit Committee. Certain specific services, subject to maximum fees ranging from $5,000 to $125,000, were generally pre-approved by the Audit Committee in 2005 and management was authorized to engage our
independent auditors to perform those services by providing detailed information to the Audit Committee.



48



---

---

PART IV



|Item 15. | Exhibits, Financial Statement Schedules
|-------- | ---------------------------------------



(a)  The following documents are filed as part of this report:



1.  Financial Statements



The following consolidated financial statements of us and our subsidiaries and the Reports of the Independent Registered
Public Accounting Firm of KPMG LLP are included in our 2005 Annual Report, and are incorporated herein by reference:



Consolidated Statements of OperationsYears Ended December 31, 2005, 2004 and 2003.



Consolidated Balance SheetsDecember 31, 2005 and 2004.



Consolidated Statements of Cash
FlowsYears Ended December 31, 2005, 2004 and 2003.



Consolidated Statements of Stockholders Equity (Deficiency)Years Ended December 31, 2005, 2004 and 2003.



Notes to Consolidated Financial Statements.



Report of the Independent Registered Public Accounting Firm.



2.  Financial Statement Schedules



|                                                                                        |  |    
|--------------------------------------------------------------------------------------- |  | ---
|Report of Independent Registered Public Accounting Firm on Financial Statement Schedule |  | F-1
|Valuation and Qualifying Accounts                                                       |  | F-2



3.Exhibits



|            |  |                                                                                                                                                                                                                                                                                    
|----------- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Description                                                                                                                                                                                                                                                                        
|            | 
|2.1         |  | Restructuring Agreement between TPG Wafer Holdings LLC and the Company, dated as of November 13, 2001 (Incorporated by reference to Exhibit 2.1 of the Companys Current Report on Form
8-K dated November 28, 2001)                                                               
|            | 
|2.2         |  | Merger Agreement between TPG Wafer Holdings LLC and the Company, dated as of November 13, 2001 (Incorporated by reference to Exhibit 2.2 of the Companys Current Report on Form 8-K dated
November 28, 2001)                                                                      
|            | 
|3.1         |  | Restated Certificate of Incorporation of the Company (Incorporated by reference to Exhibit 3-a of the Companys Form 10-Q for the Quarter ended June 30, 1995)                                                                                                                     
|            | 
|3.2         |  | Certificate of Amendment of Restated Certificate of Incorporation of the Company as filed with the Secretary of State of the State of Delaware on June 2, 2000 (Incorporated by reference to
Exhibit 3-(i)(a) of the Companys Form 10-Q for the Quarter ended June 30, 2000)      
|            | 
|3.3         |  | Certificate of Amendment of Restated Certificate of Incorporation of the Company as filed with the Secretary of State of the State of Delaware on July 10, 2002 (Incorporated by reference to
Exhibit 3-(i)(b) of the Companys Form 10-Q for the Quarter ended September 30, 2002)
|            | 
|3.4         |  | Restated By-laws of the Company (Incorporated by reference to Exhibit 3(ii) of the Companys Form 10-Q for the Quarter ended March 31, 2004)                                                                                                                                       
|            | 
|4.1         |  | Form of Warrant Certificate (Incorporated by reference to Exhibit 4.6 of the Companys Current Report on Form 8-K dated November 28, 2001)                                                                                                                                         
|            | 
|10.1        |  | Share Sale and Purchase Agreement dated January 16, 2004 by and among the Company, China Steel Corporation, China Development Industrial Bank and Chiao Tung Bank (Incorporated by reference to
Exhibit 2.1 of the Companys Current Report on Form 8-K dated January 30, 2004)    



49



---

|            |  |                                                                                                                                                                                                                                                                                              
|----------- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Description                                                                                                                                                                                                                                                                                  
|10.2        |  | Letter of Exercise of Call Option by Taisil Electronic Materials Corporation to Robina Finance & Leasing Corporation, Ltd. dated February 3, 2004 (Incorporated by reference to Exhibit 2.2
of the Companys Current Report on Form 8-K dated January 30, 2004)                              
|            | 
|10.3        |  | Joint Venture Agreement dated August 28, 1990 among the Company, Pohang Iron and Steel Company, Ltd. (POSCO) and Samsung Electronics Company, Ltd. (Samsung)
(Incorporated by reference to Exhibit 10-c of Amendment No. 1 to the Companys Form S-1 Registration Statement No. 33-92412)
|            | 
|10.4        |  | First Amendment to Joint Venture Agreement dated December 9, 1993 among the Company, POSCO and Samsung (Incorporated by reference to Exhibit 10-d of Amendment No. 1 to the Companys Form
S-1 Registration Statement No. 33-92412)                                                          
|            | 
|10.5        |  | Second Amendment to Joint Venture Agreement dated December 30, 1994 among the Company, POSCO and Samsung (Incorporated by reference to Exhibit 10-e of Amendment No. 1 to the Companys
Form S-1 Registration Statement No. 33-92412)                                                        
|            | 
|10.6        |  | Share Transfer Agreement dated as of August 1, 2004 by and among Texas Instruments Incorporated, the Company, and MEMC Southwest Inc. (Incorporated by reference to Exhibit 10-g of the Company
Form 10-Q for the Quarter ended June 30, 2004)                                               
|            | 
|10.7        |  | Registration Rights Agreement by and among the Company, TPG Wafer Holdings LLC and the Guarantors specified therein, dated as of November 3, 2001 (Incorporated by reference to Exhibit 10.2 of
the Companys Current Report on Form 8-K dated November 28, 2001)                            
|            | 
|10.8        |  | Amendment to Registration Rights Agreement dated July 15, 2002, among the Company, TPG Wafer Holdings LLC and Guarantors specified therein (Incorporated by reference to Exhibit 10-i(1) of the
Companys Form 10-Q for the Quarter ended September 30, 2002)                                
|            | 
|10.9        |  | Amendment No. 2 to Registration Rights Agreement dated November 14, 2002, among the Company, TPG Wafer Holdings LLC and the Guarantors specified therein (Incorporated by reference to Exhibit
10-i(2) of the Companys Form 10-K for the Year ended December 31, 2002)                      
|            | 
|10.10       |  | Amendment No. 3 to Registration Rights Agreement dated February 17, 2003, among the Company, TPG Wafer Holdings LLC and the Guarantors specified therein (Incorporated by reference to Exhibit
10-i(3) of the Companys Form 10-Q for the Quarter ended March 31, 2003)                      
|            | 
|10.11       |  | Amendment No. 4 to Registration Rights Agreement dated August 31, 2003, among the Company, TPG Wafer Holdings LLC and the Guarantors specified therein (Incorporated by reference to Exhibit
10-i(4) of the Companys Form 10-Q for the Quarter ended September 30, 2003)                    
|            | 
|10.12       |  | Form of Master Reserve Volume Agreement (Incorporated by reference to Exhibit 10-m of the Companys Form 10-K for the Year ended December 31, 1995)                                                                                                                                          
|            | 
|10.13       |  | MEMC Technology License Agreement dated as of July 31, 1995, between Albemarle Corporation and the Company (Incorporated by reference to Exhibit 10-tt of the Companys Form 10-K for the
Year ended December 31, 1995)                                                                      
|            | 
|*10.14      |  | Seller Technology License Agreement dated as of July 31, 1995, among Albemarle Corporation, the Company, and MEMC Pasadena, Inc. (Incorporated by reference to Exhibit 10-ll of the
Companys Form 10-K/A Amendment No. 2 for the Year ended December 31, 1997)                              
|            | 
|*10.15      |  | Technology Purchase Agreement dated as of July 31, 1995, among Albemarle Corporation and the Company (Incorporated by reference to Exhibit 10-mm of the Companys Form 10-K/A Amendment
No. 2 for the Year ended December 31, 1997)                                                          
|            | 
|10.16       |  | Ground Lease Agreement dated as of July 31, 1995, between Albemarle Corporation and MEMC Pasadena, Inc. (Incorporated by reference to Exhibit 10-nn of the Companys Form 10-K/A Amendment
No. 2 for the Year ended December 31, 1997)                                                       



50



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|            |  |                                                                                                                                                                                                                                                                    
|----------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Description                                                                                                                                                                                                                                                        
|10.17       |  | Amendment to Ground Lease Agreement dated as of May 31, 1997, between the Company, MEMC Pasadena, Inc., and Albemarle Corporation (Incorporated by reference to Exhibit 10-nn(1) of the
Companys Form 10-K/A Amendment No. 2 for the Year ended December 31, 1997)
|            | 
|10.18      |  | Separation Agreement and General Release by and between the Company and Chandramohan Subramaniam (Incorporated herein by reference to Exhibit 10 of the Companys Form S-3 Registration
Statement No. 333-122520)                                                  
|            | 
|10.19      |  | MEMC Electronic Materials, Inc. 1995 Equity Incentive Plan as Amended and Restated on January 26, 2004 (Incorporated by reference to Exhibit 10-cc of the Companys Form 10-K for the
Year ended December 31, 2003)                                                
|            | 
|10.20      |  | Form of Restricted Stock Unit Award Agreement (Incorporated by reference to Exhibit 10-cc(1) of the Company Form 10-Q for the Quarter ended June 30, 2004)                                                                                                         
|            | 
|10.21      |  | Form of Stock Option and Restricted Stock Agreement (Incorporated by reference to Exhibit 10-t(1) of the Companys Form 10-K for the Year ended December 31, 1995)                                                                                                 
|            | 
|10.22      |  | Form of Stock Option and Performance Restricted Stock Agreement (Incorporated by reference to Exhibit 10-yy of the Companys Form 10-K for the Year ended December 31,
1995)                                                                                       
|            | 
|10.23      |  | Form of Stock Option Agreement (Incorporated by reference to Exhibit 10-zz of the Companys Form 10-K for the Year ended December 31, 1995)                                                                                                                        
|            | 
|10.24      |  | Form of Stock Option and Performance Restricted Stock Agreement (Incorporated by reference to Exhibit 10-nnn of the Companys Form 10-Q for the Quarter ended March 31,
1997)                                                                                      
|            | 
|10.25      |  | Form of Stock Option Agreement (Incorporated by reference to Exhibit 10-ooo of the Companys Form 10-Q for the Quarter ended March 31, 1997)                                                                                                                       
|            | 
|10.26      |  | Form of Stock Option Agreement (Non-employee Directors) (Incorporated by reference to Exhibit 10-ppp of the Companys Form 10-Q for the Quarter ended March 31, 1997)                                                                                              
|            | 
|10.27      |  | Form of Stock Option Agreement (Incorporated by reference to Exhibit 10-cc(7) of the Companys Form 10-K for the Year ended December 31, 1999)                                                                                                                     
|            | 
|10.28      |  | Form of Stock Option Agreement (4-year cliff vesting) (Incorporated by reference to Exhibit 10-cc(9) of the Companys Form 10-Q for the Quarter ended March 31, 2002)                                                                                              
|            | 
|10.29      |  | Form of Stock Option Agreement (2-year cliff vesting) (Incorporated by reference to Exhibit 10-cc(10) of the Companys Form 10-Q for the Quarter ended March 31, 2002)                                                                                             
|10.30      |  | Form of Stock Option Agreement (7-year cliff vesting) (Incorporated by reference to Exhibit 10-cc(11) of the Companys Form 10-Q for the Quarter ended March 31, 2002)                                                                                             
|            | 
|10.31      |  | Form of Stock Option Agreement (Outside Directors) (Incorporated by reference to Exhibit 10-cc(12) of the Companys Form 10-K for the Year ended December 31, 2003)                                                                                                
|            | 
|10.32      |  | MEMC Electronic Materials, Inc. 2001 Equity Incentive Plan as Restated on March 2, 2004 (Incorporated by reference to Exhibit 10-dd of the Companys Form 10-K for the Year ended December
31, 2003)                                                               
|            | 
|10.33      |  | Form of Stock Option Agreement (4 year vesting) (Incorporated by reference to Exhibit 10-dd(1) of the Companys Form 10-Q for the Quarter ended March 31, 2002)                                                                                                    
|            | 
|10.34      |  | Form of Stock Option Agreement (7 year cliff vesting) (Incorporated by reference to Exhibit 10-dd(2) of the Companys Form 10-Q for the Quarter ended March 31, 2002)                                                                                              
|            | 
|10.35      |  | Form of Stock Option Agreement (end of contract vesting) (Incorporated by reference to Exhibit 10-dd(3) of the Companys Form 10-K for the Year ended December 31, 2002)                                                                                           



51



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|            |  |                                                                                                                                                                                                                                                                                                                                                                                                      
|----------- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Description                                                                                                                                                                                                                                                                                                                                                                                          
|10.36      |  | Stock Option Grant Agreement (Incorporated herein by reference to Exhibit 99.1 to the Companys Form S-8 Registration Statement filed March 1, 2002)                                                                                                                                                                                                                                                 
|            | 
|10.37      |  | Stock Option Grant Agreement (Incorporated herein by reference to Exhibit 99.2 to the Companys Form S-8 Registration Statement filed March 1, 2002)                                                                                                                                                                                                                                                 
|            | 
|10.38      |  | Written Description of MEMC Electronic Materials, Inc. Cash Incentive Plan Covering Executive Officers (Incorporated by reference to Exhibit 10-hh of the Companys Form 10-Q for the
Quarter ended September 30, 2004)                                                                                                                                                                              
|            | 
|10.39      |  | Employment Agreement effective as of March 26, 2002 between the Company and Nabeel Gareeb (Incorporated by reference to Exhibit 10-ii of the Companys Form 10-Q for the Quarter ended
June 30, 2002)                                                                                                                                                                                                
|            | 
|10.40      |  | Stock Option Grant Agreement (2002 Service Option) (Incorporated by reference to Exhibit 10-ii(1) of the Companys Form 10-Q for the Quarter ended June 30, 2002)                                                                                                                                                                                                                                    
|            | 
|10.41      |  | Stock Option Grant Agreement (Four Year Vesting) (Incorporated by reference to Exhibit 10-ii(2) of the Companys Form 10-Q for the Quarter ended June 30, 2002)                                                                                                                                                                                                                                      
|            | 
|10.42      |  | Stock Option Grant Agreement (Seven Year Vesting) (Incorporated by reference to Exhibit 10-ii(3) of the Companys Form 10-Q for the Quarter ended June 30, 2002)                                                                                                                                                                                                                                     
|            | 
|10.43      |  | Amendment to Stock Option Grant Agreement (2002 Service Option) (Incorporated by reference to Exhibit 10-ii(4) of the Company Form 10-Q for the Quarter ended June 30, 2004)                                                                                                                                                                                                                         
|            | 
|10.44      |  | Form of Restricted Stock Unit Award Agreement under the 2001 Equity Incentive Plan                                                                                                                                                                                                                                                                                                                   
|            | 
|10.45      |  | Form of Indemnification Agreement (Incorporated by reference to Exhibit 10-jj of the Companys Form 10-Q for the Quarter ended September 30, 2002)                                                                                                                                                                                                                                                   
|            | 
|10.46      |  | Form of Indemnification Agreement (Incorporated by reference to Exhibit 10-jj(1) of the Companys Form 10-Q for the Quarter ended March 31, 2003)                                                                                                                                                                                                                                                    
|            | 
|10.47      |  | Summary of Director Compensation                                                                                                                                                                                                                                                                                                                                                                     
|            | 
|10.48      |  | Summary of Compensation Arrangements for Certain Named Executive Officers                                                                                                                                                                                                                                                                                                                            
|            | 
|10.49       |  | Reimbursement Agreement, dated as of December 21, 2001 by and among the Company, TPG Partners III, L.P., TCW/Crescent Mezzanine Partners III, L.P, TCW/Crescent Mezzanine Trust III, Green
Equity Investors III, L.P. and Green Equity Investors Side III, L.P, and Citicorp USA, Inc. (Incorporated by reference to Exhibit 10.1 of the Companys Current Report on Form 8-K dated January 14, 2002)
|            | 
|10.50       |  | Letter Agreement of March 24, 2005 with TPG GenPar III, L.P., terminating Management Advisory Agreement between the parties (Incorporated by reference to Exhibit 10 of the Companys
Form 10-Q for the Quarter ended March 31, 2005)                                                                                                                                                                
|            | 
|10.51       |  | Revolving Credit Agreement, dated as of July 21, 2005, by and among the Company, National City Bank of the Midwest, US Bank National Association and the other lender signatories thereto
(Incorporated by reference to Exhibit 10-eee(1) of the Companys Quarterly report on Form 10-Q for the Quarter ended June 30, 2005)                                                                        
|            | 
|10.52       |  | Subsidiary Guarantee, dated as of July 21, 2005, by and among the Company, National City Bank of the Midwest, as Administrative Agent, and the guarantor signatories thereto (Incorporated by
reference to Exhibit 10-eee(2) of the Companys Quarterly report on Form 10-Q for the Quarter ended June 30, 2005)                                                                                     
|            | 
|10.53       |  | Pledge Agreement, dated as of July 21, 2005, by and among the Company, National City Bank of the Midwest, as Collateral Agent, and the pledgor signatories thereto (Incorporated by reference
to Exhibit 10-eee(3) of the Companys Quarterly report on Form 10-Q for the Quarter ended June 30, 2005)                                                                                               



52



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|            |  |                                                                                                                                                   
|----------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Description                                                                                                                                       
|13          |  | Selected pages from the Companys 2005 Annual Report                                                                                              
|            | 
|21          |  | Subsidiaries of the Company                                                                                                                       
|            | 
|23          |  | Consent of KPMG LLP                                                                                                                               
|            | 
|31.1        |  | Certification by the Chief Executive Officer of the Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                             
|            | 
|31.2        |  | Certification by the Chief Financial Officer of the Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                            
|            | 
|32          |  | Certification by the Chief Executive Officer and Chief Financial Officer of the Company pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

---

|* | Confidential treatment of certain portions of these documents has been granted.
|- | -------------------------------------------------------------------------------

| | These exhibits constitute management contracts, compensatory plans and arrangements required to be filed as an exhibit to this form pursuant to Item 14(c) of this report.
|- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------





53



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SIGNATURES



Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.



MEMC ELECTRONIC MATERIALS, INC.By:

/S/    NABEEL
GAREEBNabeel Gareeb President and Chief Executive Officer




Date: August 10, 2006



Pursuant to the
requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons, on behalf of the registrant and in the capacities and on the dates indicated.



|                                            |  |                                                                                                        |  |                
|------------------------------------------- |  | ------------------------------------------------------------------------------------------------------ |  | ---------------
|Signature                                   |  | Title                                                                                                  |  | Date           
|                                            |  |                                                                                                       
|/S/    NABEEL
GAREEBNabeel
Gareeb           |  | President, Chief Executive Officer and Director (Principal executive officer)                          |  | August 10, 2006
|                                            |  |                                                                                                       
|/S/    KENNETH H.
HANNAHKenneth H.
Hannah   |  | Senior Vice President and Chief Financial Officer (Principal financial officer and accounting officer) |  | August 10, 2006
|                                            |  |                                                                                                       
|/S/    PETER
BLACKMOREPeter
Blackmore       |  | Director                                                                                               |  | August 10, 2006
|                                            |  |                                                                                                       
|/S/    ROBERT J.
BOEHLKERobert J.
Boehlke   |  | Director                                                                                               |  | August 10, 2006
|                                            |  |                                                                                                       
|/S/    JOHN
MARRENJohn Marren               |  | Chairman of the Board of Directors                                                                     |  | August 10, 2006
|                                            |  |                                                                                                       
|/S/    C. DOUGLAS
MARSHC. Douglas
Marsh     |  | Director                                                                                               |  | August 10, 2006
|                                            |  |                                                                                                       
|/S/    WILLIAM E.
STEVENSWilliam E.
Stevens |  | Director                                                                                               |  | August 10, 2006
|                                            |  |                                                                                                       
|/S/    JAMES B.
WILLIAMSJames B.
Williams   |  | Director                                                                                               |  | August 10, 2006



54



---

EXHIBIT INDEX



The following exhibits are filed as part of this report.



|      |  |                                                                                                                                                   
|----- |  | --------------------------------------------------------------------------------------------------------------------------------------------------
|10.44 |  | Form of Restricted Stock Unit Award Agreement under the 2001 Equity Incentive Plan                                                                
|      | 
|10.47 |  | Summary of Director Compensation                                                                                                                  
|      | 
|10.48 |  | Summary of Compensation Arrangements for Certain Named Executive Officers                                                                         
|      | 
|13    |  | Selected pages from the Companys 2005 Annual Report                                                                                              
|      | 
|21    |  | Subsidiaries of the Company                                                                                                                       
|      | 
|23    |  | Consent of KPMG LLP                                                                                                                               
|      | 
|31.1  |  | Certification by the Chief Executive Officer of the Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                             
|      | 
|31.2  |  | Certification by the Chief Financial Officer of the Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                            
|      | 
|32    |  | Certification by the Chief Executive Officer and Chief Financial Officer of the Company pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.



55



---

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM



The Board of Directors

MEMC Electronic Materials, Inc.:



Under date of August 10, 2006, we reported on the consolidated balance sheets of MEMC Electronic Materials, Inc. and subsidiaries (the Company) as of December 31, 2005 and 2004, and the related consolidated statements of
operations, stockholders equity (deficiency), and cash flows for each of the years in the three-year period ended December 31, 2005, as incorporated by reference in the Annual Report on Form 10-K for the year ended December 31, 2005.
In connection with our audits of the aforementioned consolidated financial statements, we also audited the related financial statement schedule as listed in Item 15 in the Annual Report on Form 10-K. This financial statement schedule is the
responsibility of the Companys management. Our responsibility is to express an opinion on this financial statement schedule based on our audits.



In our opinion, such financial statement schedule, when considered in relation to the basic consolidated financial statements taken as a whole, presents
fairly, in all material respects, the information set forth therein.



As discussed in note 2 to the consolidated financial statements, the Company has restated the consolidated statements of cash flows for the years ended December 31, 2004 and 2003.



/s/    KPMG LLP

St. Louis, Missouri

August 10, 2006



F-1



---

MEMC ELECTRONIC MATERIALS, INC. AND SUBSIDIARIES



SCHEDULE IIVALUATION AND QUALIFYING ACCOUNTS



|                                                                     |  |                                |  |                             |      |  |                                  |         |  |                     |      |  |                       
|-------------------------------------------------------------------- |  | ------------------------------ |  | --------------------------- | ---- |  | -------------------------------- | ------- |  | ------------------- | ---- |  | ----------------------
|                                                                     |  | Balance at Beginning of Period |  | Charged toCosts andExpenses |      |  | Charged toOtherAccountsDescribe |         |  | DeductionsDescribe |      |  | Balance atEnd ofPeriod
|                                                                     |  | (Dollars in thousands)        
|Allowance for doubtful accounts:                                     |  |                                |  |                             |      |  |                                  |         |  |                     |      |  |                       
|Year ended December 31, 2003                                         |  | 3,294                          |  |                            |      |  | 322                              | (a)     |  | (1,208              | )(b) |  | 2,408                 
|Year ended December 31, 2004                                         |  | 2,408                          |  |                            |      |  | 131                              | (a)     |  | (906                | )(b) |  | 1,633                 
|Year ended December 31, 2005                                         |  | 1,633                          |  | 32                          |      |  | (207                             | )(a)    |  | (47                 | )(b) |  | 1,411                 
|Allowance for slow moving/lower of cost or market/other impairments: |  |                                |  |                             |      |  |                                  |         |  |                     |      |  |                       
|Year ended December 31, 2003                                         |  | 11,161                         |  | 2,554                       | (c)  |  | 3,025                            | (a)(e)  |  | (11,354             | )(d) |  | 5,386                 
|Year ended December 31, 2004                                         |  | 5,386                          |  | (2,535                      | )(c) |  | 4,558                            | (a)(e)  |  | (2,733              | )(d) |  | 4,676                 
|Year ended December 31, 2005                                         |  | 4,676                          |  | 1,019                       | (c)  |  | (653                             | )(a)    |  | (316                | )(d) |  | 4,726                 
|Spare parts reserves:                                                |  |                                |  |                             |      |  |                                  |         |  |                     |      |  |                       
|Year ended December 31, 2003                                         |  | 10,173                         |  |                            |      |  | (2,411                           | )(a)(e) |  | (2,248              | )(f) |  | 5,514                 
|Year ended December 31, 2004                                         |  | 5,514                          |  | 10                          | (c)  |  | (5,062                           | )(a)(e) |  | (427                | )(f) |  | 35                    
|Year ended December 31, 2005                                         |  | 35                             |  |                            |      |  | (8                               | )(a)    |  |                    |      |  | 27                    

---

|(a) | Currency fluctuations
|--- | ---------------------

|(b) | Write-off of uncollectible accounts
|--- | -----------------------------------

|(c) | Charged to cost of goods sold
|--- | -----------------------------

|(d) | Write-off of inventory
|--- | ----------------------

|(e) | Includes transfers between inventory and spare parts reserve
|--- | ------------------------------------------------------------

|(f) | Write-off of spare parts
|--- | ------------------------



F-2