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
May 13, 2026
(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: May 13, 2026
EXHIBIT INDEX
| Exhibit | Description |
|---|---|
| 99 | 6K on 05/13/2026 |
EX-99
www.umc.com
Exhibit
Exhibit Description
99.1 Announcement on 2026/05/13: To announce the registration of capital reduction due to cancellation of the RSA
99.2 Announcement on 2026/05/13: To announce accumulative shares repurchased exceeding NTD$300 million in value
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: 2026/05/12
Date of completion of capitalization change registration: 2026/05/12
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$125,785,246,190; the shares outstanding are 12,578,524,619 shares; book value per share is NT$32.33
(2) After the capital reduction: The paid-in capital is NT$125,769,848,700; the shares outstanding are 12,576,984,870 shares; book value per share is NT$32.34
(Note: Net worth per share was calculated based on the consolidated financial statements for the first quarter of 2026 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
To announce accumulative shares repurchased exceeding NTD$300 million in value
Date the cumulative no. of shares currently repurchased accounted for 2 percent or more of the shares issued by the company, or amounted to NT$300 million or more: 2026/05/13
No. of shares currently repurchased (shares): 6,500,000 shares
Type of shares currently repurchased: Common share
Total monetary amount of shares currently repurchased (NTD): NTD$637,759,742
Current average repurchase price per share (NTD): NTD$98.12
Cumulative no. of the company's own shares held during the repurchase period (shares): 16,751,000 shares
Cumulative no. of the company’s own shares held during the repurchase period as a percentage of the total no. of the company’s issued shares: 0.13%
Any other matters that need to be specified: None