UMC (NYSE: UMC) VP Hu Che-Jen trims stake with 10,000-share sale

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP Vice President Hu Che-Jen reported an open-market sale of 10,000 common shares at 171.3 New Taiwan Dollars per share. After this transaction, he directly holds 3,214,080 common shares. This remaining position includes 828,800 shares of Restricted Stock Awards, with specified amounts scheduled to vest annually on December 5 from 2026 through 2029.

Insider Trade Summary

Net Seller: 10,000 shares ($1,713,000)

Net Sell 1 txn

Insider HU CHE-JEN

Role Vice President

Sold 10,000 shs ($1.71M)

Type	Security	Shares	Price	Value
Sale	Common Shares	10,000	$171.30	$1.71M

Holdings After Transaction: Common Shares — 3,214,080 shares (Direct, null)

Footnotes (1)

1. New Taiwan Dollars Includes 828,800 shares of Restricted Stock Award (RSA) and a specified number of shares subject to the RSA will vest annually on December 5 from 2026 to 2029.

Key Figures

Shares sold: 10,000 shares Sale price: 171.3 New Taiwan Dollars/share Shares held after sale: 3,214,080 shares +2 more

5 metrics

Shares sold 10,000 shares Open-market sale of UMC common shares

Sale price 171.3 New Taiwan Dollars/share Price for the 10,000-share open-market sale

Shares held after sale 3,214,080 shares Direct UMC common share holdings post-transaction

Restricted Stock Awards 828,800 shares Included within post-transaction direct holdings

RSA vesting schedule Annually on December 5, 2026–2029 Future vesting dates for Restricted Stock Awards

Key Terms

open-market sale, Restricted Stock Award (RSA), New Taiwan Dollars

3 terms

open-market sale financial

"reported an open-market sale of 10,000 common shares at 171.3 New Taiwan Dollars"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Restricted Stock Award (RSA) financial

"Includes 828,800 shares of Restricted Stock Award (RSA) which will vest annually"

New Taiwan Dollars financial

"171.3 New Taiwan Dollars per share was the reported sale price"

The New Taiwan Dollar (NTD) is the official currency used in Taiwan for everyday transactions, like buying groceries or paying bills. For investors, it matters because its value can influence Taiwan’s economy and affect the profitability of investments related to the region. Changes in the currency’s strength can also impact international trade and financial markets involving Taiwan.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/30/2026 - 09:49 PM Accepted by SEC EDGAR 06/30/2026 - 09:48 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

HU CHE-JEN

(Last) (First) (Middle)

8F, NO.68, SEC. 1, NEIHU RD.,

(Street)

TAIPEI 11493

(City) (State) (Zip)

TAIWAN

(Country)

2. Issuer Name and Ticker or Trading Symbol
UNITED MICROELECTRONICS CORP [ UMC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Vice President

2a. Foreign Trading Symbol
[2303.TW]

3. Date of Earliest Transaction (Month/Day/Year)
06/30/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Shares	06/30/2026		S		10,000	D	$171.3(1)	3,214,080(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. New Taiwan Dollars

2. Includes 828,800 shares of Restricted Stock Award (RSA) and a specified number of shares subject to the RSA will vest annually on December 5 from 2026 to 2029.

	/s/Chitung Liu, attorney-in-fact	06/30/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did UMC executive Hu Che-Jen do in this Form 4 transaction?

Hu Che-Jen executed an open-market sale of 10,000 UMC common shares. The transaction was reported as a sale at 171.3 New Taiwan Dollars per share, reflecting a routine change in his directly held share position as a company vice president.

At what price did UMC Vice President Hu Che-Jen sell his shares?

He sold 10,000 UMC common shares at 171.3 New Taiwan Dollars per share. This disclosed price represents the per-share consideration for the reported open-market sale, providing investors a clear reference for the transaction’s execution level.

How many UMC shares does Hu Che-Jen hold after the reported sale?

Following the sale, Hu Che-Jen holds 3,214,080 UMC common shares directly. This figure includes both unrestricted shares and 828,800 shares granted as Restricted Stock Awards, which are subject to vesting conditions over several future years.

What Restricted Stock Awards (RSA) are included in Hu Che-Jen’s UMC holdings?

His holdings include 828,800 UMC shares granted as Restricted Stock Awards. A specified number of these RSA shares will vest each year on December 5 from 2026 through 2029, reflecting equity-based compensation that becomes fully owned over time.

What is Hu Che-Jen’s role at UNITED MICROELECTRONICS CORP (UMC)?

Hu Che-Jen serves as a Vice President at UNITED MICROELECTRONICS CORP. His position as an officer makes his equity transactions reportable, giving investors transparency into changes in his direct ownership of the company’s common shares.

Were any derivative securities or options involved in this UMC Form 4?

No derivative securities or options were reported in this transaction. The filing describes a single non-derivative event: an open-market sale of 10,000 UMC common shares and the resulting updated total of directly held shares.