UMC (UMC) April 2026 net sales grow 10.8% with modest FX derivative losses

Rhea-AI Filing Summary

United Microelectronics Corporation reports April 2026 net sales and related treasury activities. April 2026 net sales were NT$22,663,945 thousand, up from NT$20,454,530 thousand in April 2025, an increase of 10.80%. Year-to-date net sales reached NT$83,701,847 thousand versus NT$78,313,487 thousand a year earlier, a 6.88% rise.

The company reports no funds lent to other parties and no endorsements or guarantees for April 2026. In financial derivative transactions not under hedging accounting, UMC held forwards with unwritten-off trading contracts of NT$1,328,040 thousand, showing a fair value loss of NT$5,456 thousand and a realized loss of NT$1,724 thousand.

Key Figures

April 2026 net sales: NT$22,663,945 thousand April 2025 net sales: NT$20,454,530 thousand April YoY change: 10.80% +6 more

9 metrics

April 2026 net sales NT$22,663,945 thousand Net sales for April 2026

April 2025 net sales NT$20,454,530 thousand Net sales for April 2025 (comparison base)

April YoY change 10.80% Year-over-year change in April net sales

Year-to-date 2026 net sales NT$83,701,847 thousand Net sales year-to-date 2026

Year-to-date 2025 net sales NT$78,313,487 thousand Net sales year-to-date 2025 (comparison base)

YTD YoY change 6.88% Year-over-year change in year-to-date net sales

Unwritten-off forward contracts NT$1,328,040 thousand Notional amount of forwards, non-hedging

Fair value loss on forwards NT$5,456 thousand Non-hedging forwards fair value loss

Realized loss on forwards NT$1,724 thousand Loss from written-off forward contracts

Key Terms

financial derivative transactions, hedging accounting, endorsements and guarantees, fair value, +1 more

5 terms

financial derivative transactions financial

"Financial derivative transactions for the period of April 2026."

hedging accounting financial

"Financial derivatives transactions a Not under hedging accounting"

endorsements and guarantees financial

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

fair value financial

"Fair Value | 0 | 0 | (5,456) | 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 | (1,724) | 0"

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

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

May 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: May 8, 2026

2

EXHIBIT INDEX

Exhibit		Description
99.1		6K on 05/08/2026

3

www.umc.com

Exhibit

Exhibit Description

99.1 Announcement on 2026/05/08: April Revenue

Exhibit 99.1

United Microelectronics Corporation

May 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 April 2026.

1)Sales volume (NT$ Thousand)

Period	Items	2026	2025	Changes	%
April	Net sales	22,663,945	20,454,530	2,209,415	10.80%
Year-to-Date	Net sales	83,701,847	78,313,487	5,388,360	6.88%

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	1,328,040	0
Fair Value	0	0	(5,456)	0
Net profit (loss) from Fair Value	0	0	(4,802)	0
Written-off Trading
Contracts	0	0	2,817,150	0
Realized profit (loss)	0	0	(1,724)	0

FAQ

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

UMC’s April 2026 net sales were NT$22,663,945 thousand, compared with NT$20,454,530 thousand in April 2025. This represents a 10.80% year-over-year increase, indicating higher sales volume for the month versus the prior year period.

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

Year-to-date 2026 net sales for UMC totaled NT$83,701,847 thousand, up from NT$78,313,487 thousand in the same 2025 period. This reflects a 6.88% increase, showing overall sales have grown compared with the previous year-to-date.

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

UMC reported no funds lent to other parties for April 2026. This means there were no outstanding intercompany or third-party lending arrangements recorded under this disclosure item during the month, helping limit credit exposure from such activities.

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

For April 2026, UMC disclosed no endorsements and guarantees. This indicates the company did not issue financial guarantees or similar support obligations to other entities during the period covered, reducing contingent liability from such commitments.

What derivative financial results did UMC (UMC) record in April 2026?

UMC’s non-hedging derivative activity showed forwards with unwritten-off contracts of NT$1,328,040 thousand, a fair value loss of NT$5,456 thousand, and a realized loss of NT$1,724 thousand. These figures reflect modest losses from financial derivative transactions.

What were UMC (UMC) written-off forward contract amounts in April 2026?

UMC reported written-off forward trading contracts totaling NT$2,817,150 thousand in April 2026 under non-hedging accounting. Alongside these notional amounts, the company recognized a realized loss of NT$1,724 thousand from these derivative activities.

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 37.7 KB