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
June 29, 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: June 29, 2026
EXHIBIT INDEX
| Exhibit | Description | |
|---|---|---|
| 99.1 | 6K on 06/29/2026 |
EX-99.1
www.umc.com
Exhibit
Exhibit Description
99.1 Announcement on 2026/06/29: Announcement of the completion of the 22nd stock buy-back plan by the company
Exhibit 99.1
Announcement of the completion of the 22nd stock buy-back plan by the company
Originally determined ceiling on total monetary amount of the share repurchase (NTD): 212,951,478,175
Originally scheduled period for the repurchase: 2026/04/30~2026/06/29
Originally determined no. of shares to be repurchased (shares):
A maximum of 50,000,000 shares
Originally determined repurchase price range (NTD): 52.50 to 109.50 per share
Actual period of the current repurchase: 2026/05/05~2026/05/20
No. of shares currently repurchased (shares): 30,551,000
Total monetary amount of shares currently repurchased (NTD): 3,095,665,789
Current average repurchase price per share (NTD): 101.33
Cumulative no. of the company’s own shares held (shares): 30,551,000
Cumulative no. of the company's own shares as a percentage of the total no. of the company’s issued shares (%): 0.24%
Reason for non-completion of the current share repurchase:
In the consideration of the market conditions and shareholders’ interest, the Company did not complete the execution of the share repurchase program at this time.
- Any other matters that need to be specified: none