UMC CFO Liu Chitung sells 1.9M company shares

UNITED MICROELECTRONICS CORP CFO & SVP Liu Chitung reported an open-market sale of 1,900,000 Common Shares on July 13, 2026 at NT$154.8900 per share.

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP CFO & SVP Liu Chitung reported an open-market sale of 1,900,000 Common Shares on July 13, 2026 at NT$154.8900 per share. Following the sale, Liu holds 3,322,917 Common Shares directly, including 1,210,000 shares of Restricted Stock Award (RSA), with a specified number of RSA shares vesting annually on December 5 from 2026 to 2029. Liu also reports indirect ownership of 2,000,000 shares through CTBC Bank Trust, where the shares are under Trust with Discretion Reserved, and 150,000 shares held by a spouse.

Filing Explained

The July 13 Form 4 records a completed 1.9-million-share direct sale by CFO Chitung Liu, leaving 3,322,917 direct shares and no plan disclosed.

The July 13, 2026 Form 4 records CFO and SVP Chitung Liu's sale of 1,900,000 UMC common shares, so the disclosed transaction has occurred and changes the reporting person's ownership position.

The transaction is coded S, which denotes an open-market sale, at a reported price of 154.89 New Taiwan dollars per share. Following the sale, the filing reports 3,322,917 common shares held directly by Liu.

The filing separately lists 150,000 shares held indirectly through Liu's spouse and 2,000,000 shares under a CTBC Bank trust with discretion reserved. No Rule 10b5-1 trading plan is disclosed in this filing, so this is a sale with no trading plan disclosed in the filing.

The platform's 90-day record lists two UMC insider sales totaling 1,910,000 shares and no purchases, including a 10,000-share sale by Vice President HU CHE-JEN on June 30, 2026.

Insider Trade Summary

Net Seller: 1,900,000 shares

Net Sell 3 txns

Insider Liu Chitung

Role CFO & SVP

Sold 1,900,000 shs ($294.29M)

Type	Security	Shares	Price	Value
Sale	Common Shares F1, F2	1,900,000	$154.89	$294.29M
holding	Common Shares	--	--	--
holding	Common Shares F3	--	--	--

Holdings After Transaction: Common Shares — 3,322,917 shares (Direct); Common Shares — 150,000 shares (Indirect, By Spouse); Common Shares — 2,000,000 shares (Indirect, By CTBC Bank Trust)

Footnotes (3)

1. F1. New Taiwan Dollars
2. F2. Includes 1,210,000 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.
3. F3. The shares are under Trust with Discretion Reserved.

Key Figures

Shares sold: 1,900,000 shares Sale price: NT$154.8900 per share Direct holdings after sale: 3,322,917 shares +3 more

6 metrics

Shares sold 1,900,000 shares Open-market or private sale of UMC Common Shares on July 13, 2026 by CFO & SVP Liu Chitung

Sale price NT$154.8900 per share Price per UMC Common Share for the 1,900,000-share sale, denominated in New Taiwan Dollars

Direct holdings after sale 3,322,917 shares Total UMC Common Shares directly held by Liu Chitung following the reported transaction

Indirect holdings via CTBC Bank Trust 2,000,000 shares UMC Common Shares held indirectly by Liu Chitung through CTBC Bank Trust, under Trust with Discretion Reserved

Indirect holdings via spouse 150,000 shares UMC Common Shares indirectly owned through Liu Chitung’s spouse after the reported sale

Restricted Stock Award shares 1,210,000 shares RSA shares included within Liu Chitung’s direct UMC holdings, vesting annually on December 5 from 2026 to 2029

Key Terms

Restricted Stock Award (RSA), Trust with Discretion Reserved, open-market sale

3 terms

Restricted Stock Award (RSA) financial

"Includes 1,210,000 shares of Restricted Stock Award (RSA) and a specified number of shares"

Trust with Discretion Reserved financial

"The shares are under Trust with Discretion Reserved."

open-market sale financial

"transaction_action: open-market sale, transaction code S indicating a sale in open market"

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.

FAQ

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

What did UMC (UMC) CFO Liu Chitung report in this Form 4?

Liu Chitung reported an open-market sale of 1,900,000 UMC Common Shares at NT$154.8900 per share. The filing also details Liu’s remaining direct and indirect shareholdings after the transaction, including restricted stock awards and trust-held shares.

How many UMC (UMC) shares did Liu Chitung sell and at what price?

Liu Chitung sold 1,900,000 Common Shares of UNITED MICROELECTRONICS CORP at NT$154.8900 per share. The sale is classified as a sale in open market or private transaction, as indicated by transaction code S in the Form 4.

What are Liu Chitung’s direct UMC (UMC) holdings after the reported sale?

After the reported sale, Liu Chitung directly holds 3,322,917 Common Shares of UMC. This direct position includes 1,210,000 shares of Restricted Stock Award (RSA), which will vest annually on December 5 from 2026 to 2029 as specified.

What indirect UMC (UMC) shareholdings does Liu Chitung report?

Liu Chitung reports indirect ownership of 2,000,000 Common Shares held by CTBC Bank Trust and 150,000 shares held by spouse. The trust-held shares are described as being under Trust with Discretion Reserved according to the Form 4 footnotes.

What does the RSA vesting schedule mean for UMC (UMC) shares held by Liu Chitung?

The Form 4 states that Liu holds 1,210,000 Restricted Stock Award (RSA) shares, with a specified number of these shares to vest annually on December 5 from 2026 to 2029. Vesting means those RSA shares incrementally become fully owned over that period.

In what currency is the UMC (UMC) sale price of NT$154.8900 quoted?

The sale price of NT$154.8900 per share is denominated in New Taiwan Dollars. A Form 4 footnote explicitly identifies this currency, clarifying that the transaction price and related values are quoted in New Taiwan Dollars, not U.S. dollars.

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

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Accepted by SEC EDGAR 07/13/2026 - 06:04 AM 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^*

Liu Chitung

(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)
	CFO & SVP

2a. Foreign Trading Symbol
[2303.TW]

3. Date of Earliest Transaction (Month/Day/Year)
07/13/2026

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	07/13/2026		S		1,900,000	D	$154.89(1)	3,322,917(2)	D
Common Shares								150,000	I	By Spouse
Common Shares								2,000,000(3)	I	By CTBC Bank Trust

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 1,210,000 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.

3. The shares are under Trust with Discretion Reserved.

	/s/Chitung Liu	07/13/2026
	** 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)