Share buyback tops NTD$406M at United Microelectronics (NYSE: UMC)

Rhea-AI Filing Summary

United Microelectronics Corporation reports progress on its share buyback program, with total repurchased value reaching NTD$406,598,693 as of 2026/05/15. The company has repurchased 3,780,000 common shares at an average price of NTD$107.57 per share.

During the repurchase period, UMC holds 20,531,000 of its own shares, equal to 0.16% of its total issued share count. This update signals ongoing capital return through share repurchases, though the proportion of shares bought back remains relatively small versus total shares issued.

Key Figures

Cumulative repurchase value: NTD$406,598,693 Shares currently repurchased: 3,780,000 shares Average repurchase price: NTD$107.57 per share +3 more

6 metrics

Cumulative repurchase value NTD$406,598,693 Total monetary amount of shares currently repurchased

Shares currently repurchased 3,780,000 shares Number of common shares repurchased as of 2026/05/15

Average repurchase price NTD$107.57 per share Current average repurchase price per common share

Cumulative treasury shares 20,531,000 shares Company’s own shares held during repurchase period

Treasury shares as % of issued 0.16% Cumulative own shares held as a percentage of issued shares

Threshold date reached 2026/05/15 Date cumulative repurchases exceeded NTD$300 million or 2% condition

Key Terms

accumulative shares repurchased, average repurchase price per share, cumulative no. of the company's own shares held, percentage of the total no. of the company's issued shares, +1 more

5 terms

accumulative shares repurchased financial

"To announce accumulative shares repurchased exceeding NTD$300 million in value"

average repurchase price per share financial

"Current average repurchase price per share (NTD): NTD$107.57"

cumulative no. of the company's own shares held financial

"Cumulative no. of the company's own shares held during the repurchase period (shares): 20,531,000 shares"

percentage of the total no. of the company's issued shares financial

"Cumulative no. of the company’s own shares held ... as a percentage of the total no. of the company's issued shares: 0.16%"

Common share financial

"Type of shares currently repurchased: Common share"

A common share is a type of ownership in a company that gives the holder a claim to a portion of the company’s profits and assets. It often comes with voting rights, allowing shareholders to participate in decisions about the company’s direction. For investors, owning common shares can mean potential for growth and income, but also involves a higher level of risk compared to other types of investments.

Form 6-K: How Foreign Companies Report to the SEC →

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 15, 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 15, 2026

2

EXHIBIT INDEX

Exhibit		Description
99.1		6K on 05/15/2026

3

www.umc.com

Exhibit

Exhibit Description

99.1 Announcement on 2026/05/15: To announce accumulative shares repurchased exceeding NTD$300 million in value

Exhibit 99.1

To announce accumulative shares repurchased exceeding NTD$300 million in value

1. 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: 2026/05/15

2. No. of shares currently repurchased (shares): 3,780,000 shares

3. Type of shares currently repurchased: Common share

4. Total monetary amount of shares currently repurchased (NTD): NTD$406,598,693

5. Current average repurchase price per share (NTD): NTD$107.57

6. Cumulative no. of the company's own shares held during the repurchase period (shares): 20,531,000 shares

7. 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: 0.16%

8. Any other matters that need to be specified: None

FAQ

What did UMC (UMC) announce in its latest Form 6-K about share repurchases?

UMC announced that its cumulative share repurchases reached NTD$406,598,693 as of 2026/05/15. The company is buying back common shares as part of a capital return program, with specific details on shares, value, and percentages disclosed in the report.

How many UMC (UMC) shares have been repurchased so far?

UMC reported that it has repurchased 3,780,000 common shares as of 2026/05/15. These repurchases contribute to a total of 20,531,000 treasury shares held during the repurchase period, giving investors a sense of the buyback’s current scale.

What is the total value of UMC (UMC) shares repurchased to date?

The total monetary amount of UMC’s repurchased shares is NTD$406,598,693. This figure reflects the cumulative cost of buybacks during the current repurchase period, indicating how much capital the company has allocated to returning cash via share repurchases.

At what average price is UMC (UMC) repurchasing its shares?

UMC’s current average repurchase price is NTD$107.57 per common share. This average price helps investors compare the company’s buyback activity with recent market trading levels and evaluate how management is executing the repurchase program.

What percentage of UMC (UMC) total issued shares has been bought back?

UMC stated that its cumulative own shares held during the repurchase period represent 0.16% of total issued shares. This percentage shows that, while buybacks are ongoing, the current program affects only a small portion of the overall share base.

What type of shares is UMC (UMC) repurchasing under this program?

UMC is repurchasing common shares under its current buyback activity. Focusing on common stock directly affects the company’s publicly traded equity, rather than preferred or other share classes, and reduces the freely available common float over time.

Filing Exhibits & Attachments

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Press Releases

• EX-99.1 EX-99.1 9.0 KB