UMC 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

March 11, 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): 

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: March 11, 2025

EXHIBIT INDEX

Exhibit		Description
99		6K on 03/11/2025

EX-99

www.umc.com

Exhibit

Exhibit Description

99.1 Announcement on 2025/03/10: To announce the registration of capital reduction due to cancellation of the RSA

99.2 Announcement on 2025/03/11: UMC will attend investor conferences on 2025/03/18~2025/03/19

99.3 Announcement on 2025/03/06: February Revenue

99.4 Announcement on 2025/03/10: the trading and pledge of UMC common shares by directors, executive officers and 10% shareholders of UMC

Exhibit 99.1

To announce the registration of capital reduction due to cancellation of the RSA

1. Date of the competent authority’s approval of capital reduction: 2025/03/07

2. Date of completion of capitalization change registration: 2025/03/07

3. Effect on the financial statements (including any discrepancy between the amount of paid-in capital and the no. of shares outstanding, and the effect on net worth per share):

(1) Before the capital reduction: The paid-in capital is NT$125,607,164,040; the shares outstanding are 12,560,716,404 shares; book value per share is NT$30.09.

(2) After the capital reduction: The paid-in capital is NT$125,583,590,180; the shares outstanding are 12,558,359,018 shares; book value per share is NT$30.09.

(Note: Net worth per share was calculated based on the consolidated financial statements for the year of 2024 audited by CPA.)

4. Plan for expected share replacement operations: NA

5. Estimated no. of listed common shares after capital reduction and new issue: NA

6. Estimated no. of listed common shares as a percentage of issued common shares after capital reduction and new issue (No. of common shares after capital reduction / No. of issued common shares): NA

7. Countermeasures for poor circulation of equity if the aforesaid estimated no. of listed common shares does not reach 60 million shares and the percentage does not reach 25% after capital reduction: NA

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

Exhibit 99.2

UMC will attend investor conferences on 2025/03/18~2025/03/19

1. Date of institutional investor conference: 2025/03/18~2025/03/19

2. Time of institutional investor conference: 01:00 PM

3. Location of institutional investor conference: Grand Hyatt Taipei

4. Outline of institutional investor conference:

The Company will attend the “2025 Asia Tech Conference”, held by BofA Securities.

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

Exhibit 99.3

United Microelectronics Corporation

March 6, 2025

This is to report the changes or status of 1) Sales volume, 2) Funds lent to other parties, 3) Endorsements and guarantees, and 4) Financial derivative transactions for the period of February 2025.

• Sales volume (NT$ Thousand)

Period	Items	2025	2024	Changes	%
February	Net sales	18,193,515	17,451,268	742,247	4.25%
Year-to-Date	Net sales	38,000,310	36,464,965	1,535,345	4.21%

• Funds lent to other parties (NT$ Thousand): None

• Endorsements and guarantees (NT$ Thousand)

Balance as of period end	This Month<br><br>(actual amount provided)	Last Month<br><br>(actual amount provided)	Limit of lending
UMC	6,408,864	8,782,760	170,067,776
Note: On February 22, 2017, March 7, 2018, October 24, 2018, July 24,2019, December 18, 2019, July 29, 2020, October 29, 2020, December 16, 2020, July 28, 2021, October 27, 2021, December 15, 2021, April 27, 2022, October 26, 2022, December 14, 2022, April 26, 2023, July 26, 2023, December 13, 2023, February 27, 2024 ,July 31, 2024, December 18, 2024 and February 26, 2025, the board of directors resolved to provide endorsement to USC(Xiamen)’s syndicated loan from banks for the amount up to CNY¥ 1,428 million.

• Financial derivatives transactions:

a Not under hedging accounting: NT$ thousand

UMC

Financial instruments	Option		Forwards	IRS
		Put			Call
Deposit Paid	0	0	0	0
Royalty Income (Paid)	0	0	0	0
Unwritten-off Trading
Contracts	0	0	524,320	0
Fair Value	0	0	383	0
Net profit (loss) from Fair Value	0	0	1,420	0
Written-off Trading
Contracts	0	0	1,576,220	0
Realized profit (loss)	0	0	(3,684)	0

Exhibit 99.4

United Microelectronics Corporation

For the month of February, 2025

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 January 31, 2025	Number of shares as of February 28, 2025	Changes
-	-	-	-	-

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

Title	Name	Number of shares as of January 31, 2025	Number of shares as of February 28, 2025	Changes
-	-	-	-	-