6-K
United Microelectronics Corp (UMC)
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 6-K
REPORT OF FOREIGN ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16
OF THE SECURITIES EXCHANGE ACT OF 1934
November 12, 2025
(Commission File Number: 001-15128)
United Microelectronics Corporation
(Translation of registrant’s name into English)
No. 3 Li-Hsin 2nd Road,
Hsinchu Science Park,
Hsinchu, Taiwan, R.O.C.
(Address of principal executive office)
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):
SIGNATURES
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.
| United Microelectronics Corporation | |
|---|---|
| By: | Chitung Liu |
| Name: | Chitung Liu |
| Title: | CFO |
Date: November 12, 2025
EXHIBIT INDEX
| Exhibit | Description |
|---|---|
| 99 | 6K on 11/12/2025 |
EX-99
www.umc.com
Exhibit
Exhibit Description
99.1 Announcement on 2025/11/12: To announce the registration of capital reduction due to cancellation of the RSA
99.2 Announcement on 2025/11/07: the trading and pledge of UMC common shares by directors, executive officers and 10% shareholders of UMC
Exhibit 99.1
To announce the registration of capital reduction due to cancellation of the RSA
Date of the competent authority’s approval of capital reduction: 2025/11/10
Date of completion of capitalization change registration: 2025/11/10
Effect on the financial statements (including any discrepancy between the amount of paid-in capital and the no. of shares outstanding, and the effect on net worth per share):
(1) Before the capital reduction: The paid-in capital is NT$125,563,274,190; the shares outstanding are 12,556,327,419 shares; book value per share is NT$28.76
(2) After the capital reduction: The paid-in capital is NT$125,552,783,440; the shares outstanding are 12,555,278,344 shares; book value per share is NT$28.76
(Note: Net worth per share was calculated based on the consolidated financial statements for the third quarter of 2025 reviewed by CPA.)
Plan for expected share replacement operations: NA
Estimated no. of listed common shares after capital reduction and new issue: NA
Estimated no. of listed common shares as a percentage of issued common shares after capital reduction and new issue (No. of common shares after capital reduction/No. of issued common shares): NA
Countermeasures for poor circulation of equity if the aforesaid estimated no. of listed common shares does not reach 60 million shares and the percentage does not reach 25% after capital reduction: NA
Any other matters that need to be specified: None
Exhibit 99.2
United Microelectronics Corporation
For the month of October, 2025
This is to report 1) the trading of directors, executive officers and 10% shareholders of United Microelectronics Corporation (“UMC”) (NYSE: UMC); 2) the pledge and clear of pledge of UMC common shares by directors, executive officers and 10% shareholders of UMC;
- The trading of directors, executive officers and 10% shareholders
| Title | Name | Number of shares as of September 30, 2025 | Number of shares as of October 31, 2025 | Changes |
|---|---|---|---|---|
| -- | -- | -- | -- | -- |
- The pledge and clear of pledge of UMC common shares by directors, executive officers and 10% shareholders:
| Title | Name | Number of shares as of September 30, 2025 | Number of shares as of October 31, 2025 | Changes |
|---|---|---|---|---|
| -- | -- | -- | -- | -- |