UMC completes 22nd share repurchase plan

United Microelectronics Corporation reported the completion of its 22nd stock buy-back plan.

Accepted by SEC EDGAR 06/29/2026 - 06:02 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

United Microelectronics Corporation reported the completion of its 22nd stock buy-back plan. The company had authorized up to 50,000,000 shares with a monetary ceiling of NTD 212,951,478,175 for repurchases scheduled between 2026/04/30 and 2026/06/29.

During the actual repurchase period from 2026/05/05 to 2026/05/20, UMC bought back 30,551,000 shares for a total of NTD 3,095,665,789 at an average price of NTD 101.33 per share. These repurchased shares represent 0.24% of the company’s issued shares. Management cited market conditions and shareholders’ interest as reasons for not using the full authorized amount.

Key Figures

Authorized buy-back ceiling: NTD 212,951,478,175 Authorized shares: 50,000,000 shares Actual shares repurchased: 30,551,000 shares +5 more

8 metrics

Authorized buy-back ceiling NTD 212,951,478,175 Ceiling on total monetary amount of 22nd share repurchase

Authorized shares 50,000,000 shares Maximum number of shares to be repurchased

Actual shares repurchased 30,551,000 shares Shares bought during 2026/05/05–2026/05/20

Total amount spent NTD 3,095,665,789 Cost of shares currently repurchased

Average repurchase price NTD 101.33 per share Average price paid in current repurchase

Cumulative treasury shares 30,551,000 shares Company’s own shares held after the 22nd plan

Treasury shares as % of issued 0.24% Cumulative own shares vs. total issued shares

Repurchase price range NTD 52.50–109.50 Originally determined repurchase price range per share

Key Terms

stock buy-back plan, share repurchase, repurchase price range, the company’s own shares

4 terms

stock buy-back plan financial

"Announcement of the completion of the 22nd stock buy-back plan by the company"

share repurchase financial

"Originally determined ceiling on total monetary amount of the share repurchase (NTD)"

A share repurchase is when a company uses cash to buy its own shares from the market, reducing the number of shares available to outside investors. Like a homeowner buying back rooms in a shared house to increase their own stake, repurchases can raise earnings per share and often signal management thinks the stock is undervalued, but they also use up cash that could have gone to dividends, investments, or debt reduction — all important considerations for investors.

repurchase price range financial

"Originally determined repurchase price range (NTD): 52.50 to 109.50 per share"

the company’s own shares financial

"Cumulative no. of the company’s own shares held (shares)"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did UMC (UMC) announce in its June 29, 2026 Form 6-K?

UMC announced the completion of its 22nd stock buy-back plan. The company executed repurchases during May 2026 and provided details on shares bought, total spending, and average repurchase price.

How many shares did UMC (UMC) repurchase under the 22nd buy-back plan?

UMC repurchased 30,551,000 shares under the 22nd stock buy-back plan. These repurchased shares represent 0.24% of the company’s total issued shares, as disclosed in the announcement.

What was the total amount UMC (UMC) spent on the 22nd share repurchase?

UMC spent NTD 3,095,665,789 on the 22nd share repurchase. This total reflects the cost of buying 30,551,000 shares during the actual repurchase period in May 2026.

What was UMC’s (UMC) average repurchase price in the 22nd buy-back plan?

UMC’s average repurchase price was NTD 101.33 per share. This figure comes from buying 30,551,000 shares for a total of NTD 3,095,665,789 during the plan’s execution window.

Why did UMC (UMC) not repurchase the full 50 million shares authorized?

UMC stated it did not complete the full share repurchase because of market conditions and shareholders’ interest. The company chose to stop after buying 30,551,000 shares rather than using the entire authorization.

What was the authorized size and price range of UMC’s (UMC) 22nd buy-back plan?

The 22nd buy-back plan authorized up to 50,000,000 shares with a monetary ceiling of NTD 212,951,478,175. The approved repurchase price range was NTD 52.50 to NTD 109.50 per share.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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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

2

EXHIBIT INDEX

Exhibit		Description
99.1		6K on 06/29/2026

3

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

1. Originally determined ceiling on total monetary amount of the share repurchase (NTD): 212,951,478,175

2. Originally scheduled period for the repurchase: 2026/04/30~2026/06/29

3. Originally determined no. of shares to be repurchased (shares):

A maximum of 50,000,000 shares

4. Originally determined repurchase price range (NTD): 52.50 to 109.50 per share

5. Actual period of the current repurchase: 2026/05/05~2026/05/20

6. No. of shares currently repurchased (shares): 30,551,000

7. Total monetary amount of shares currently repurchased (NTD): 3,095,665,789

8. Current average repurchase price per share (NTD): 101.33

9. Cumulative no. of the company’s own shares held (shares): 30,551,000

10. Cumulative no. of the company's own shares as a percentage of the total no. of the company’s issued shares (%): 0.24%

11. 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.

12. Any other matters that need to be specified: none

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 10.7 KB