January 2026 sales up 5.33% at United Microelectronics (UMC)

Rhea-AI Filing Summary

United Microelectronics Corporation reports that January 2026 net sales were NT$20,862,150 thousand, up from NT$19,806,795 thousand in January 2025, a 5.33% increase. Year-to-date net sales figures match January, reflecting the same 5.33% growth.

The company reports no funds lent to other parties and no endorsements or guarantees for January 2026. In financial derivatives not designated for hedging, UMC held forward contracts with an unwritten-off notional amount of NT$565,380 thousand, a fair value of NT$3,920 thousand, and a net profit from fair value changes of NT$4,574 thousand. Written-off forward contracts totaled NT$691,840 thousand with a realized loss of NT$3,346 thousand.

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

February 5, 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: February 5, 2026

2

EXHIBIT INDEX

Exhibit		Description
99.1		6K on 02/05/2026

3

www.umc.com

Exhibit

Exhibit Description

99.1 Announcement on 2026/02/05: January Revenue

Exhibit 99.1

United Microelectronics Corporation

February 5, 2026

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 January 2026.

1)Sales volume (NT$ Thousand)

Period	Items	2026	2025	Changes	%
January	Net sales	20,862,150	19,806,795	1,055,355	5.33%
Year-to-Date	Net sales	20,862,150	19,806,795	1,055,355	5.33%

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

3)Endorsements and guarantees (NT$ Thousand): None

4)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	565,380	0
Fair Value	0	0	3,920	0
Net profit (loss) from Fair Value	0	0	4,574	0
Written-off Trading
Contracts	0	0	691,840	0
Realized profit (loss)	0	0	(3,346)	0

FAQ

How did UMC (UMC) perform in January 2026 compared to January 2025?

UMC’s January 2026 net sales were NT$20,862,150 thousand, up from NT$19,806,795 thousand a year earlier. This represents a 5.33% year-over-year increase, indicating moderate top-line growth at the start of 2026.

What were United Microelectronics Corporation’s year-to-date sales for January 2026?

Year-to-date net sales for UMC in January 2026 were NT$20,862,150 thousand. Because this covers only the first month, the year-to-date figure matches January’s sales and reflects the same 5.33% growth over January 2025.

Did UMC lend funds to other parties in January 2026?

UMC reported no funds lent to other parties for January 2026. This means there were no reported intercompany or external loans outstanding under this disclosure item for that month, limiting credit exposure from such activities.

Were there any endorsements or guarantees issued by UMC in January 2026?

UMC reported no endorsements or guarantees for January 2026. The absence of such items indicates the company did not provide third-party guarantees or similar commitments that month under this reporting category.

What financial derivative positions did UMC report for January 2026?

For derivatives not under hedging accounting, UMC showed forward contracts with an unwritten-off notional amount of NT$565,380 thousand and fair value of NT$3,920 thousand. Net profit from fair value was NT$4,574 thousand, while realized loss on written-off contracts was NT$3,346 thousand.

Did UMC report gains or losses from derivative transactions in January 2026?

UMC reported a net profit from fair value changes on forward contracts of NT$4,574 thousand. It also recorded a realized loss of NT$3,346 thousand on written-off forward contracts, showing modest derivative-related impacts for the month.