UMC (NYSE: UMC) completes NTD$375M share buyback at NTD$90.14

Rhea-AI Filing Summary

United Microelectronics Corporation reported that its ongoing share repurchase program has now exceeded NTD$300 million in total value. As of 2026/05/07, the company has repurchased 4,166,000 common shares for a total of NTD$375,536,827 at an average price of NTD$90.14 per share.

These repurchased shares represent 0.03% of the company’s total issued shares, indicating a relatively small buyback in proportion to overall share capital.

Key Figures

Shares repurchased: 4,166,000 shares Total repurchase amount: NTD$375,536,827 Average repurchase price: NTD$90.14 per share +2 more

5 metrics

Shares repurchased 4,166,000 shares Cumulative repurchases as of 2026/05/07

Total repurchase amount NTD$375,536,827 Cumulative cost of repurchased shares

Average repurchase price NTD$90.14 per share Average price paid over repurchase period

Repurchase threshold NTD$300 million Disclosure trigger for cumulative repurchases

Repurchases vs issued shares 0.03% Cumulative own shares as percentage of issued shares

Key Terms

shares repurchased, average repurchase price, the company’s own shares, issued shares

4 terms

shares repurchased financial

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

average repurchase price financial

"Current average repurchase price per share (NTD): NTD$90.14"

the company’s own shares financial

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

issued shares financial

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

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 7, 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 7, 2026

2

EXHIBIT INDEX

Exhibit		Description
99.1		6K on 05/07/2026

3

www.umc.com

Exhibit

Exhibit Description

99.1 Announcement on 2026/05/07: 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: 2026/05/07

2. No. of shares currently repurchased (shares):4,166,000 shares

3. Type of shares currently repurchased: Common share

4. Total monetary amount of shares currently repurchased (NTD): NTD$375,536,827

5. Current average repurchase price per share (NTD): NTD$90.14

6. Cumulative no. of the company's own shares held during the repurchase period (shares): 4,166,000 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: 0.03%

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

FAQ

What did UMC (UMC) announce about its share repurchase program?

UMC announced that its cumulative share repurchases have exceeded NTD$300 million. As of 2026/05/07, it has bought back 4,166,000 common shares for NTD$375,536,827, reflecting a targeted capital management action.

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

UMC has repurchased 4,166,000 common shares under its program. This cumulative amount, recorded as of 2026/05/07, represents the company’s own shares acquired in the market and held during the repurchase period.

What total amount has UMC (UMC) spent on share repurchases?

UMC has spent NTD$375,536,827 on share repurchases. This total monetary amount reflects the cost of buying back 4,166,000 common shares and surpasses the NTD$300 million disclosure threshold mentioned in the announcement.

What is UMC’s (UMC) average share repurchase price?

UMC’s current average share repurchase price is NTD$90.14 per share. This figure is calculated over the 4,166,000 common shares repurchased during the program, providing insight into the price level at which the company has been buying stock.

What portion of UMC (UMC) total issued shares has been repurchased?

The repurchased 4,166,000 shares equal 0.03% of UMC’s total issued shares. This percentage, stated in the announcement, shows the buyback’s size relative to the company’s overall share count during the repurchase period.

When did UMC’s (UMC) share repurchases cross the NTD$300 million threshold?

UMC’s cumulative share repurchases reached or exceeded NTD$300 million on 2026/05/07. This date marks when the total repurchase value triggered the disclosure threshold described in the company’s announcement.

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 8.7 KB