UMC posts 4.9% March sales growth in 2026

United Microelectronics Corporation reported steady March 2026 operating data.

Rhea-AI Filing Summary

United Microelectronics Corporation reported steady March 2026 operating data. March net sales were NT$20,830,626 thousand, up 4.89% from March 2025. Year-to-date 2026 net sales reached NT$61,037,902 thousand, a 5.49% increase over the same period in 2025.

The company reported no funds lent to other parties and no endorsements or guarantees in March 2026. For financial derivatives, UMC had unwritten-off forward trading contracts with a notional amount of NT$1,118,250 thousand, a negative fair value of NT$11,945 thousand, a net loss from fair value of NT$11,292 thousand, and realized losses of NT$6,276 thousand on written-off forwards.

Key Figures

March 2026 net sales: NT$20,830,626 thousand March 2025 net sales: NT$19,858,647 thousand March YoY change: 4.89% +5 more

8 metrics

March 2026 net sales NT$20,830,626 thousand Net sales for March 2026

March 2025 net sales NT$19,858,647 thousand Net sales for March 2025

March YoY change 4.89% Year-over-year net sales change for March

YTD 2026 net sales NT$61,037,902 thousand Year-to-date net sales 2026

YTD 2025 net sales NT$57,858,957 thousand Year-to-date net sales 2025

YTD YoY change 5.49% Year-to-date net sales growth vs 2025

Unwritten-off forwards notional NT$1,118,250 thousand Forward trading contracts not under hedging accounting

Forward contracts fair value NT$(11,945) thousand Negative fair value on forwards in March 2026

Key Terms

financial derivative transactions, endorsements and guarantees, unwritten-off trading contracts, fair value, +1 more

5 terms

financial derivative transactions financial

"4) Financial derivatives transactions for the period of March 2026."

endorsements and guarantees financial

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

unwritten-off trading contracts financial

"Unwritten-off Trading | | | | Contracts | 0 | 0 | 1,118,250 | 0"

fair value financial

"Fair Value | 0 | 0 | (11,945) | 0"

Fair value is an estimate of what an asset or company is really worth today, derived from expected future earnings, comparable market prices and other relevant facts—like agreeing a price for a used car after checking mileage, condition and similar listings. Investors use fair value to decide whether a stock looks overpriced or undervalued, which helps guide buy, hold or sell decisions and sets expectations for potential returns and risk.

realized profit (loss) financial

"Realized profit (loss) | 0 | 0 | (6,276) | 0"

FAQ

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

How did UMC (UMC) perform in March 2026 net sales?

UMC’s March 2026 net sales were NT$20,830,626 thousand, rising 4.89% from NT$19,858,647 thousand in March 2025. This indicates modest year-over-year growth in monthly revenue for the period reported.

What are UMC (UMC) year-to-date 2026 net sales and growth?

Year-to-date 2026 net sales for UMC totaled NT$61,037,902 thousand, compared with NT$57,858,957 thousand a year earlier. This represents a 5.49% increase over the same period in 2025, reflecting steady top-line expansion.

Did UMC (UMC) lend funds to other parties in March 2026?

UMC reported that funds lent to other parties for March 2026 were none. This means the company did not extend loans to external entities during the period covered in this report.

Did UMC (UMC) provide endorsements or guarantees in March 2026?

UMC disclosed that endorsements and guarantees for March 2026 were none. The company did not issue financial guarantees or endorsements to other parties during the reported period.

What derivative positions did UMC (UMC) report for March 2026?

UMC showed unwritten-off forward contracts of NT$1,118,250 thousand with a negative fair value of NT$11,945 thousand. Net loss from fair value was NT$11,292 thousand, and realized loss on written-off forwards was NT$6,276 thousand.

Did UMC (UMC) use options or interest rate swaps in March 2026?

For March 2026, UMC reported zero balances for put and call options, deposits paid, royalty income, and interest rate swaps. Derivative activity was limited to forward contracts as detailed in the disclosure.

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

Form 6-K: How Foreign Companies Report to the SEC →

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Accepted by SEC EDGAR 04/08/2026 - 06:04 AM 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

April 8, 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: April 8, 2026

2

EXHIBIT INDEX

Exhibit		Description
99.1		6K on 04/08/2026

3

www.umc.com

Exhibit

Exhibit Description

99.1 Announcement on 2026/04/08: March Revenue

Exhibit 99.1

United Microelectronics Corporation

April 8, 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 March 2026.

1)Sales volume (NT$ Thousand)

Period	Items	2026	2025	Changes	%
March	Net sales	20,830,626	19,858,647	971,979	4.89%
Year-to-Date	Net sales	61,037,902	57,858,957	3,178,945	5.49%

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	1,118,250	0
Fair Value	0	0	(11,945)	0
Net profit (loss) from Fair Value	0	0	(11,292)	0
Written-off Trading
Contracts	0	0	1,704,430	0
Realized profit (loss)	0	0	(6,276)	0

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 37.7 KB