# EDGAR Filing Document

**Accession Number:** 0001033767
**File Stem:** 0000950170-25-081991
**Filing Date:** 2025-6
**Character Count:** 8184
**Document Hash:** 6f1b4793ca7da59929a027582a1429da
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000950170-25-081991.hdr.sgml**: 20250605

**ACCESSION NUMBER**: 0000950170-25-081991

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 3

**CONFORMED PERIOD OF REPORT**: 20250605

**FILED AS OF DATE**: 20250605

**DATE AS OF CHANGE**: 20250605

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** UNITED MICROELECTRONICS CORP
- **CENTRAL INDEX KEY:** 0001033767
- **STANDARD INDUSTRIAL CLASSIFICATION:** SEMICONDUCTORS & RELATED DEVICES [3674]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 000000000
- **STATE OF INCORPORATION:** F5
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-15128
- **FILM NUMBER:** 251024988

**BUSINESS ADDRESS:**
- **STREET 1:** 8F, NO.68, SEC. 1, NEIHU RD.,
- **CITY:** TAIPEI
- **STATE:** F5
- **ZIP:** 11493
- **BUSINESS PHONE:** 886-2-2658-9168

**MAIL ADDRESS:**
- **STREET 1:** 8F, NO.68, SEC. 1, NEIHU RD.,
- **CITY:** TAIPEI
- **STATE:** F5
- **ZIP:** 11493

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

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**FORM 6-K** 

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**REPORT OF FOREIGN ISSUER** 

**PURSUANT TO RULE 13a-16 OR 15d-16** 

**OF THE SECURITIES EXCHANGE ACT OF 1934** 

**June 5, 2025** 

**(Commission File Number: 001-15128)** 

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**United Microelectronics Corporation**

**(Translation of registrant's name into English)** 

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**No. 3 Li-Hsin 2nd Road, Hsinchu Science Park, Hsinchu, Taiwan, R.O.C.** 

**(Address of principal executive office)** 

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Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F  Form 40-F 

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101 (b) (1): 

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101 (b) (7): 

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**<u>SIGNATURES</u>** 

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereto duly authorized.

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| | |
|:---|:---|
| United Microelectronics Corporation | United Microelectronics Corporation |
| By: | Chitung Liu |
| Name: | Chitung Liu |
| Title: | CFO |

---

Date: June 5, 2025

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**EXHIBIT INDEX** 

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| | |
|:---|:---|
| **Exhibit**  | **Description**  |
| <br>99.1 | <br>[<u>6K on 06/05/2025</u>](umc-ex99_1.htm) |

---

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## Exhibit 99.1

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

![img208044986_0.jpg](img208044986_0.jpg)**www.umc.com**

**Exhibit**

<u>Exhibit</u> <u>Description</u> 

99.1 Announcement on 2025/06/05: May Revenue

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**Exhibit 99.1**

**United Microelectronics Corporation**

June 5, 2025

This is to report the changes or status of 1) Sales volume, 2) Funds lent to other parties, 3) Endorsements and guarantees, and 4) Financial derivative transactions for the period of May 2025.

1)Sales volume (NT$ Thousand)

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| Period | Items | 2025 | 2024 | Changes | % |
| May | Net sales | 19480057 | 19509486 | (29429) | (0.15)% |
| Year-to-Date | Net sales | 97793544 | 93882976 | 3910568 | 4.17% |

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2)Funds lent to other parties (NT$ Thousand): None

3)Endorsements and guarantees (NT$ Thousand)

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| | | | |
|:---|:---|:---|:---|
| Balance as of period end | This Month(actual amount provided) | Last Month(actual amount provided) | Limit of lending |
| *UMC* | 5907636 | 6256068 | 175772204 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Note: On February 22, 2017, March 7, 2018, October 24, 2018, July 24, 2019, December 18, 2019, July 29, 2020, October 29, 2020, December 16, 2020, July 28, 2021, October 27, 2021, December 15, 2021, April 27, 2022, October 26, 2022, December 14, 2022, April 26, 2023, July 26, 2023, December 13, 2023, February 27, 2024 ,July 31, 2024, December 18, 2024 and February 26, 2025, the board of directors resolved to provide endorsement to USC(Xiamen)'s syndicated loan from banks for the amount up to CNY¥ 1,428 million.* | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Note: On February 22, 2017, March 7, 2018, October 24, 2018, July 24, 2019, December 18, 2019, July 29, 2020, October 29, 2020, December 16, 2020, July 28, 2021, October 27, 2021, December 15, 2021, April 27, 2022, October 26, 2022, December 14, 2022, April 26, 2023, July 26, 2023, December 13, 2023, February 27, 2024 ,July 31, 2024, December 18, 2024 and February 26, 2025, the board of directors resolved to provide endorsement to USC(Xiamen)'s syndicated loan from banks for the amount up to CNY¥ 1,428 million.* | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Note: On February 22, 2017, March 7, 2018, October 24, 2018, July 24, 2019, December 18, 2019, July 29, 2020, October 29, 2020, December 16, 2020, July 28, 2021, October 27, 2021, December 15, 2021, April 27, 2022, October 26, 2022, December 14, 2022, April 26, 2023, July 26, 2023, December 13, 2023, February 27, 2024 ,July 31, 2024, December 18, 2024 and February 26, 2025, the board of directors resolved to provide endorsement to USC(Xiamen)'s syndicated loan from banks for the amount up to CNY¥ 1,428 million.* | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Note: On February 22, 2017, March 7, 2018, October 24, 2018, July 24, 2019, December 18, 2019, July 29, 2020, October 29, 2020, December 16, 2020, July 28, 2021, October 27, 2021, December 15, 2021, April 27, 2022, October 26, 2022, December 14, 2022, April 26, 2023, July 26, 2023, December 13, 2023, February 27, 2024 ,July 31, 2024, December 18, 2024 and February 26, 2025, the board of directors resolved to provide endorsement to USC(Xiamen)'s syndicated loan from banks for the amount up to CNY¥ 1,428 million.* |

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4)Financial derivatives transactions:

a Not under hedging accounting: NT$ thousand

***UMC***

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| | | | | |
|:---|:---|:---|:---|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Financial instruments* | &nbsp;&nbsp;Option | &nbsp;&nbsp;Option | &nbsp;&nbsp;Forwards | &nbsp;&nbsp;IRS |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Financial instruments* | &nbsp;&nbsp;Put | &nbsp;&nbsp;Call | &nbsp;&nbsp;Forwards | &nbsp;&nbsp;IRS |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Deposit Paid* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Royalty Income (Paid)* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Unwritten-off Trading* |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Contracts* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;238800 | &nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Fair Value* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;1651 | &nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Net profit (loss) from Fair Value* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;2688 | &nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Written-off Trading* |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Contracts* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;3153635 | &nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Realized profit (loss)* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;18687 | &nbsp;&nbsp;0 |

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