UMC posts 18% May 2026 sales growth

United Microelectronics Corporation reported higher sales for May 2026 and updated its derivatives positions.

Rhea-AI Filing Summary

United Microelectronics Corporation reported higher sales for May 2026 and updated its derivatives positions. May net sales were NT$22,943,755 thousand, up 17.78% from NT$19,480,057 thousand in May 2025. Year-to-date net sales reached NT$106,645,602 thousand, compared with NT$97,793,544 thousand a year earlier, an increase of 9.05%.

The company reported no funds lent to other parties and no endorsements or guarantees for May 2026. It listed financial derivative transactions not under hedging accounting, mainly forward contracts with an unwritten-off notional amount of NT$2,159,010 thousand, a fair value of NT$12,966 thousand, and a net profit from fair value of NT$13,619 thousand, plus a realized loss of NT$743 thousand on written-off forward contracts.

Insights

Semiconductor equity analyst

UMC shows solid May sales growth with limited derivatives impact.

United Microelectronics Corporation reported May 2026 net sales of NT$22,943,755 thousand, a 17.78% increase over May 2025. Year-to-date net sales reached NT$106,645,602 thousand, up 9.05%, indicating steady demand through May 2026.

The company reported no funds lent to other parties and no endorsements or guarantees, which reduces balance-sheet complexity in this excerpt. Derivative activity centers on forward contracts with unwritten-off notional of NT$2,159,010 thousand and a modest fair value gain of NT$12,966 thousand, plus a small realized loss of NT$743 thousand.

Overall, this update highlights revenue growth with relatively contained derivatives impacts. Subsequent periodic disclosures may provide broader context on margins, capacity utilization, and how monthly sales trends translate into quarterly and full-year performance.

Key Figures

May 2026 net sales: NT$22,943,755 thousand May 2025 net sales: NT$19,480,057 thousand May YoY sales change: 17.78% +5 more

8 metrics

May 2026 net sales NT$22,943,755 thousand Net sales for May 2026

May 2025 net sales NT$19,480,057 thousand Net sales for May 2025

May YoY sales change 17.78% Year-over-year change in May net sales

YTD 2026 net sales NT$106,645,602 thousand Year-to-date net sales through May 2026

YTD 2025 net sales NT$97,793,544 thousand Year-to-date net sales through May 2025

YTD sales growth 9.05% Year-to-date net sales change vs prior year

Unwritten-off forwards notional NT$2,159,010 thousand Unwritten-off trading forward contracts

Net profit from fair value NT$13,619 thousand Net profit from fair value of forwards

Key Terms

endorsements and guarantees, financial derivative transactions, hedging accounting, unwritten-off trading contracts, +2 more

6 terms

endorsements and guarantees financial

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

financial derivative transactions financial

"4) Financial derivative transactions a Not under hedging accounting"

hedging accounting financial

"4) Financial derivative transactions a Not under hedging accounting"

unwritten-off trading contracts financial

"Unwritten-off Trading | | | | Contracts | 0 | 0 | 2,159,010 | 0"

fair value financial

"Fair Value | 0 | 0 | 12,966 | 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 | (743) | 0"

FAQ

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

How did UMC (UMC) perform in May 2026 compared with May 2025?

UMC’s May 2026 net sales were NT$22,943,755 thousand, rising 17.78% from NT$19,480,057 thousand in May 2025. This year-over-year increase suggests stronger business activity and higher demand during the month compared with the same period a year earlier.

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

Year-to-date through May 2026, UMC reported net sales of NT$106,645,602 thousand, up from NT$97,793,544 thousand a year earlier. This represents 9.05% growth, indicating a generally improving revenue trend over the first five months of 2026.

Did UMC (UMC) lend funds to other parties or issue guarantees in May 2026?

For May 2026, UMC reported no funds lent to other parties and no endorsements or guarantees. This means the company did not extend loans or guarantee obligations for third parties during the month in the disclosed categories.

What financial derivative transactions did UMC (UMC) report for May 2026?

UMC reported financial derivative transactions not under hedging accounting, mainly forward contracts. Unwritten-off trading forwards totaled NT$2,159,010 thousand in notional, with fair value of NT$12,966 thousand, net profit from fair value of NT$13,619 thousand, and a realized loss of NT$743 thousand on written-off forwards.

Are UMC (UMC) options or interest rate swaps significant in this 6-K update?

In this update, UMC showed zero balances for options, deposits paid, royalty-related derivatives, and interest rate swaps. The only active derivatives disclosed are forward contracts, which carry relatively small fair value gains and realized losses compared with the company’s reported sales volumes.

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

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Accepted by SEC EDGAR 06/05/2026 - 06:02 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

June 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: June 5, 2026

2

EXHIBIT INDEX

Exhibit		Description
99.1		6K on 06/05/2026

3

www.umc.com

Exhibit

Exhibit Description

99.1 Announcement on 2026/06/05: May Revenue

Exhibit 99.1

United Microelectronics Corporation

June 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 May 2026.

1)Sales volume (NT$ Thousand)

Period	Items	2026	2025	Changes	%
May	Net sales	22,943,755	19,480,057	3,463,698	17.78%
Year-to-Date	Net sales	106,645,602	97,793,544	8,852,058	9.05%

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	2,159,010	0
Fair Value	0	0	12,966	0
Net profit (loss) from Fair Value	0	0	13,619	0
Written-off Trading
Contracts	0	0	3,670,260	0
Realized profit (loss)	0	0	(743)	0

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 37.7 KB