United Microelectronics names Ching-Shu Lo general manager

UMC also reported September share-count changes for Senior Vice President Chitung Liu and Vice President JT Lin.

Rhea-AI Filing Summary

United Microelectronics Corporation (UMC) reported that its major subsidiary, United Semiconductor (Xiamen) Co., Ltd., appointed Ching-Shu Lo as general manager effective October 23, 2026, succeeding Wen Tan following a job relocation. Lo was previously a Senior Fab Director at the subsidiary.

UMC also reported September share-count changes for Senior Vice President Chitung Liu and Vice President JT Lin. Liu’s reported shares decreased by 600,000, from 2,112,917 as of August 31, 2026, to 1,512,917 as of September 30, 2026; Lin’s decreased by 10,000, from 515,060 to 505,060 over those dates.

Key Figures

Shares held by Chitung Liu: 2,112,917 shares Shares held by Chitung Liu: 1,512,917 shares Decrease in Chitung Liu's reported shares: 600,000 shares +3 more

6 metrics

Shares held by Chitung Liu 2,112,917 shares As of August 31, 2026

Shares held by Chitung Liu 1,512,917 shares As of September 30, 2026

Decrease in Chitung Liu's reported shares 600,000 shares September 2026; table change shown as (600,000)

Shares held by JT Lin 515,060 shares As of August 31, 2026

Shares held by JT Lin 505,060 shares As of September 30, 2026

Decrease in JT Lin's reported shares 10,000 shares September 2026; table change shown as (10,000)

Key Terms

pledge, clear of pledge, 10% shareholders

3 terms

pledge financial

"the pledge and clear of pledge of UMC common shares"

A pledge is a promise to use an asset—often shares or property—as collateral to secure a loan or obligation; if the borrower defaults, the lender can take or sell the pledged asset. For investors, pledged assets can signal higher financial risk because those assets may be forced into the market if the borrower fails to meet payments, potentially driving down the asset’s price like an unexpected supply dump.

clear of pledge financial

"the pledge and clear of pledge of UMC common shares"

10% shareholders regulatory

"directors, executive officers and 10% shareholders of UMC"

FAQ

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

Who became general manager of UMC's Xiamen subsidiary?

Ching-Shu Lo, previously a Senior Fab Director at United Semiconductor (Xiamen) Co., Ltd., became its general manager effective October 23, 2026, succeeding Wen Tan following a job relocation.

What share-count changes did UMC report for September 2026?

UMC reported that Senior Vice President Chitung Liu’s share count decreased by 600,000 shares, from 2,112,917 as of August 31, 2026, to 1,512,917 as of September 30, 2026. Vice President JT Lin’s decreased by 10,000 shares, from 515,060 to 505,060 over those dates.

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

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Available on EDGAR 10/23/2026 - 06:03 AM EDT Accepted by SEC EDGAR 10/23/2026 - 06:00 AM EDT Learn about SEC filing dates

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

October 23, 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: October 23, 2026

2

EXHIBIT INDEX

Exhibit		Description
99		6K on 10/23/2026

3

www.umc.com

Exhibit

Exhibit Description

99.1 Announcement on 2026/10/23: Represent major subsidiary United Semiconductor (Xiamen) Co., Ltd. to announce change of General Manager

99.2 Announcement on 2026/10/08: the trading and pledge of UMC common shares by directors, executive officers and 10% shareholders of UMC

Exhibit 99.1

Represent major subsidiary United Semiconductor (Xiamen) Co., Ltd. to announce change of General Manager

1. Date of the board of directors’ resolution or date of occurrence of the change: 2026/10/23

2. Position (Please enter chairperson or president/general manager): General manager

3. Name of the previous position holder: TAN, WEN YI

4. Resume of the previous position holder: General manager of United Semiconductor (Xiamen) Co., Ltd.

5. Name of the new position holder: LO, CHING-SHU

6. Resume of the new position holder: Senior Fab Director of United Semiconductor (Xiamen) Co., Ltd.

7. Circumstances of change (Please enter “resignation”, “dismissal”, “term expired”, “job relocation”, “severance”, “retirement”, “death” or “new appointment”): Job relocation

8. Reason for the change: Job relocation

9. Effective date of the new appointment: 2026/10/23

10. Any other matters that need to be specified (the information disclosure also meets the requirements of Article 7, subparagraph 6 of the Securities and Exchange Act Enforcement Rules, which brings forth a significant impact on shareholders rights or the price of the securities on public companies.): None

Exhibit 99.2

United Microelectronics Corporation

For the month of September, 2026

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;

1)The trading of directors, executive officers and 10% shareholders

Title	Name	Number of shares as of August 31, 2026	Number of shares as of September 30, 2026	Changes
Senior Vice President Vice President	Chitung Liu JT Lin	2,112,917 515,060	1,512,917 505,060	(600,000) (10,000)

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

Title	Name	Number of shares as of August 31, 2026	Number of shares as of September 30, 2026	Changes
--	--	--	--	--

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99 EX-99 24.2 KB