Double-digit June 2026 revenue growth reported by UMC (NYSE: UMC)

Rhea-AI Filing Summary

United Microelectronics Corporation reported strong June 2026 operating data. Net sales for June were NT$23,124,962 thousand, up from NT$18,823,070 thousand in June 2025, an increase of NT$4,301,892 thousand or 22.85%. Year-to-date net sales reached NT$129,770,564 thousand, compared with NT$116,616,614 thousand a year earlier, an increase of NT$13,153,950 thousand or 11.28%, showing solid growth so far in 2026.

The company reported no funds lent to other parties and no endorsements or guarantees during June 2026. In financial derivative transactions not under hedge accounting, UMC showed unwritten-off forward trading contracts of NT$2,670,360 thousand, with a fair value loss of NT$11,885 thousand and a net profit (loss) from fair value of NT$(11,232) thousand, alongside realized loss of NT$(1,589) thousand on written-off forward contracts.

Insights

Semiconductor equity analyst

UMC posts double‑digit June and YTD sales growth with small FX-related derivative losses.

United Microelectronics Corporation reported June 2026 net sales of NT$23,124,962 thousand, up 22.85% year over year. Year-to-date net sales grew 11.28% to NT$129,770,564 thousand, indicating healthy demand momentum through June.

The company disclosed no funds lent to other parties and no endorsements or guarantees, which keeps off-balance-sheet credit exposure low in this snapshot. Derivative activity was limited to forwards, with unwritten-off contracts of NT$2,670,360 thousand and modest fair value and realized losses.

These derivative losses—fair value loss of NT$11,885 thousand, net fair value loss of NT$11,232 thousand, and realized loss of NT$1,589 thousand—are small relative to monthly sales. Subsequent monthly updates or quarterly filings may provide a clearer view of sustainability of this growth trend.

Key Figures

June 2026 net sales: NT$23,124,962 thousand June YoY sales growth: 22.85% YTD 2026 net sales: NT$129,770,564 thousand +5 more

8 metrics

June 2026 net sales NT$23,124,962 thousand June 2026 net sales vs June 2025

June YoY sales growth 22.85% Increase vs June 2025 net sales

YTD 2026 net sales NT$129,770,564 thousand Year-to-date 2026 vs same period 2025

YTD YoY sales growth 11.28% Increase vs year-to-date 2025 net sales

Unwritten-off forward contracts NT$2,670,360 thousand Forward derivative notional, not under hedge accounting

Forward contracts fair value loss NT$(11,885) thousand Fair value of forwards as of June 2026

Net profit (loss) from fair value NT$(11,232) thousand Net profit (loss) from fair value changes in forwards

Realized loss on forwards NT$(1,589) thousand Realized loss on written-off forward contracts

Key Terms

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

5 terms

endorsements and guarantees financial

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

financial derivative transactions financial

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

unwritten-off trading contracts financial

"Unwritten-off Trading | | | | Contracts | 0 | 0 | 2,670,360 | 0"

fair value financial

"Fair Value | 0 | 0 | (11,885) | 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 | (1,589) | 0"

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

Available on EDGAR 07/06/2026 - 06:03 AM Accepted by SEC EDGAR 07/06/2026 - 06:01 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

July 6, 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: July 6, 2026

2

EXHIBIT INDEX

Exhibit		Description
99.1		6K on 07/06/2026

3

www.umc.com

Exhibit

Exhibit Description

99.1 Announcement on 2026/07/06: June Revenue

Exhibit 99.1

United Microelectronics Corporation

July 6, 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 June 2026.

1)Sales volume (NT$ Thousand)

Period	Items	2026	2025	Changes	%
June	Net sales	23,124,962	18,823,070	4,301,892	22.85%
Year-to-Date	Net sales	129,770,564	116,616,614	13,153,950	11.28%

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	2,670,360	0
Fair Value	0	0	(11,885)	0
Net profit (loss) from Fair Value	0	0	(11,232)	0
Written-off Trading
Contracts	0	0	5,849,595	0
Realized profit (loss)	0	0	(1,589)	0

FAQ

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

UMC’s June 2026 net sales were NT$23,124,962 thousand, up 22.85% year over year. Sales increased from NT$18,823,070 thousand in June 2025, reflecting stronger demand and higher revenue in the most recent month reported.

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

Year-to-date 2026 net sales for UMC reached NT$129,770,564 thousand, up 11.28%. This compares with NT$116,616,614 thousand for the same period in 2025, indicating solid double-digit revenue growth so far in 2026.

Did UMC (UMC) report any funds lent or guarantees in June 2026?

UMC reported no funds lent to other parties and no endorsements or guarantees in June 2026. This suggests the company did not extend additional credit support or guarantees that might increase financial exposure during the month.

What financial derivative positions did UMC (UMC) disclose for June 2026?

UMC disclosed unwritten-off forward contracts of NT$2,670,360 thousand not under hedge accounting. These forwards generated a fair value loss of NT$11,885 thousand, a net fair value loss of NT$11,232 thousand, and a realized loss of NT$1,589 thousand on written-off contracts.

Are UMC’s (UMC) derivative gains or losses significant versus its sales?

UMC’s derivative losses in June 2026 were small compared with its net sales. Combined fair value and realized losses were in the tens of thousands of NT$, while June net sales exceeded NT$23 billion, making the impact relatively limited in scale.

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EX-99.1 37.7 KB