UMC (NYSE: UMC) buyback reaches 30.6M shares, NTD$1.09B value

Rhea-AI Filing Summary

United Microelectronics Corporation reported updated figures for its ongoing share repurchase program. As of 2026/05/20, the company has repurchased 10,020,000 common shares in the current tranche, at a total cost of NTD$1,089,032,948 and an average price of NTD$108.69 per share.

Cumulatively during the repurchase period, UMC now holds 30,551,000 of its own shares, which represents 0.24% of its total issued shares. The company notes that there are no additional matters needing disclosure beyond these buyback statistics.

Key Figures

Current shares repurchased: 10,020,000 shares Current repurchase amount: NTD$1,089,032,948 Average repurchase price: NTD$108.69 per share +3 more

6 metrics

Current shares repurchased 10,020,000 shares Shares currently repurchased as of 2026/05/20

Current repurchase amount NTD$1,089,032,948 Total monetary amount of shares currently repurchased

Average repurchase price NTD$108.69 per share Current average repurchase price per share

Cumulative shares held 30,551,000 shares Cumulative own shares held during repurchase period

Cumulative shares as % of issued 0.24% Cumulative own shares as percentage of issued shares

Threshold trigger date 2026/05/20 Date cumulative repurchases reached at least NTD$300 million or 2%

Key Terms

Form 6-K, shares repurchased, common share, cumulative no. of the company's own shares, +1 more

5 terms

Form 6-K regulatory

"FORM 6-K REPORT OF FOREIGN ISSUER PURSUANT TO RULE 13a-16"

A Form 6-K is a report that companies listed in certain countries file to provide important updates, such as financial results, corporate changes, or other significant information, to regulators and investors. It functions like an official company update or news release, helping investors stay informed about developments that could affect their investment decisions.

shares repurchased financial

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

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.

cumulative no. of the company's own shares financial

"Cumulative no. of the company's own shares held during the repurchase period"

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

"as a percentage of the total no. of the company's issued shares: 0.24%"

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 20, 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 20, 2026

2

EXHIBIT INDEX

Exhibit		Description
99.1		6K on 05/20/2026

3

www.umc.com

Exhibit

Exhibit Description

99.1 Announcement on 2026/05/20: 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: 2026/05/20

2. No. of shares currently repurchased (shares): 10,020,000 shares

3. Type of shares currently repurchased: Common share

4. Total monetary amount of shares currently repurchased (NTD): NTD$1,089,032,948

5. Current average repurchase price per share (NTD): NTD$108.69

6. Cumulative no. of the company's own shares held during the repurchase period (shares): 30,551,000 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: 0.24%

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 reported updated figures on its share repurchase program. As of 2026/05/20, it has repurchased 10,020,000 common shares for NTD$1,089,032,948 in this tranche, with a cumulative 30,551,000 shares held, equal to 0.24% of issued shares.

How many shares has UMC (UMC) cumulatively repurchased so far?

UMC has cumulatively repurchased 30,551,000 of its own shares during the repurchase period. These shares represent 0.24% of the company’s total issued shares, giving a sense of the buyback’s relative scale in the overall capital structure.

What is the total monetary value of UMC’s current repurchased shares?

The total monetary amount of UMC’s currently repurchased shares is NTD$1,089,032,948. This figure reflects the cost of 10,020,000 common shares acquired under the program as of 2026/05/20 at the disclosed average price per share.

What average price per share is UMC paying in its buyback program?

UMC’s current average repurchase price is NTD$108.69 per common share. This average is based on the 10,020,000 shares repurchased to date in this tranche, which together total NTD$1,089,032,948 in buyback spending.

What percentage of its issued shares has UMC repurchased so far?

UMC’s cumulative repurchased shares represent 0.24% of its total issued shares. This percentage is based on 30,551,000 of its own shares held during the repurchase period, as disclosed in the May 20, 2026 announcement.

What type of shares is UMC buying back under this repurchase program?

UMC is repurchasing its common shares under the program. The filing specifically identifies the type of shares currently repurchased as common share, and all disclosed repurchase figures relate to this class of equity.

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 9.0 KB