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6-K 1 6k_on_09102025.htm 6-K 6-K

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

September 10, 2025

(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):  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.

SIGNATURES


United Microelectronics Corporation


By:	Chitung Liu
Name:	Chitung Liu
Title:	CFO

Date: September 10, 2025

EXHIBIT INDEX

     Exhibit 

     Description

      
99

6K on 09/10/2025

EX-99 2 umc-ex99.htm EX-99 EX-99

www.umc.com

Exhibit

Exhibit Description

99.1 Announcement on 2025/09/08: UMC will attend investor conferences on 2025/09/15~2025/09/17

99.2 Announcement on 2025/09/10: the trading and pledge of UMC common shares by directors, executive officers and 10% shareholders of UMC 1. Date of institutional investor conference: 2025/09/15~2025/09/17

Exhibit 99.1

UMC will attend investor conferences on 2025/09/15~2025/09/17

2. Time of institutional investor conference: 09:00 AM

3. Location of institutional investor conference: W Hotel Taipei

4. Outline of institutional investor conference:

The Company will attend the “Taiwan Summit 2025”, held by UBS.

5. Any other matters that need to be specified: None For the month of August, 2025

Exhibit 99.2

United Microelectronics Corporation

This is to report 1) the trading of directors, executive officers and 10% shareholders of United Microelectronics Corporation (“UMC”) (NYSE: UMC); 2) the pledge and clear of pledge of UMC common shares by directors, executive officers and 10% shareholders of UMC;

The trading of directors, executive officers and 10% shareholders

     Title

     Name

     Number of shares as of July 31, 2025

     Number of shares as of August 31, 2025

     Changes

     Executive Vice President
Vice President

     Ming Hsu
S F Tzou

     6,725,400
795,308

     6,685,400
645,308

     (40,000)
(150,000)

    

The pledge and clear of pledge of UMC common shares by directors, executive officers and 10% shareholders:


Title	Name	Number of shares as of July 31, 2025	Number of shares as of August 31, 2025	Changes
--	--	--	--	--