United Micro CFO shifts 1M shares to direct holding

UMC’s CFO & SVP restructured ownership of 1,000,000 shares via trust distribution, increasing directly held Common Shares while maintaining additional indirect holdings.

Rhea-AI Filing Summary

For UNITED MICROELECTRONICS CORP (UMC), reporting person Liu Chitung, the company’s CFO & SVP, reported ownership changes in Common Shares tied to a trust restructuring on September 7, 2026. A CTBC Bank Trust distributed 1,000,000 shares to Liu, shifting those shares from indirect to direct ownership, bringing his direct holdings to 4,322,917 shares, which include 1,210,000 Restricted Stock Awards. The filing also shows 1,000,000 shares held indirectly through CTBC Bank Trust and 150,000 shares held indirectly by his spouse, and no transactions made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Other: 2,000,000 shares

Other 3 txns

Insider Liu Chitung

Role CFO & SVP

Type	Security	Shares	Price	Value
Other	Common Shares F1, F2	1,000,000	$0.00	$0.00
Other	Common Shares F1, F3	1,000,000	$0.00	$0.00
holding	Common Shares	--	--	--

Holdings After Transaction: Common Shares — 4,322,917 shares (Direct); Common Shares — 1,000,000 shares (Indirect, By CTBC Bank Trust); Common Shares — 150,000 shares (Indirect, By Spouse)

Footnotes (3)

1. F1. On September 7, 2026, the CTBC Bank Trust distributed 1,000,000 Common Shares of the Issuer to the Reporting Person due to the expiration and termination of the trust, resulting in a change in the form of the Reporting Person's ownership from indirect to direct.
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 acquired directly: 1,000,000 Common Shares Direct holdings after transaction: 4,322,917 Common Shares Indirect holdings via CTBC Bank Trust: 1,000,000 Common Shares +3 more

6 metrics

Shares acquired directly 1,000,000 Common Shares Distributed from CTBC Bank Trust on September 7, 2026, changing from indirect to direct ownership

Direct holdings after transaction 4,322,917 Common Shares Total Common Shares directly owned by the CFO & SVP after the September 7, 2026 transactions

Indirect holdings via CTBC Bank Trust 1,000,000 Common Shares Common Shares reported as indirectly owned through CTBC Bank Trust after the restructuring

Indirect holdings by spouse 150,000 Common Shares Common Shares of UNITED MICROELECTRONICS CORP indirectly owned through the reporting person’s spouse

Restricted Stock Awards included in direct holdings 1,210,000 Common Shares RSAs included in direct ownership, with portions vesting annually on December 5 from 2026 to 2029

Restructuring share total 2,000,000 Common Shares Total Common Shares involved in code J ownership restructuring transactions on September 7, 2026

Key Terms

Restricted Stock Award (RSA), Trust with Discretion Reserved, indirect ownership

3 terms

Restricted Stock Award (RSA) financial

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

Trust with Discretion Reserved financial

"The shares are under Trust with Discretion Reserved."

indirect ownership financial

"resulting in a change in the form of the Reporting Person's ownership from indirect"

FAQ

What ownership change did UMC CFO Liu Chitung report on this Form 4 for UMC?

He reported a trust-related restructuring in which 1,000,000 Common Shares were distributed from a CTBC Bank Trust to him on September 7, 2026, changing those shares from indirect to direct ownership and raising his directly held stake to 4,322,917 shares.

How many UMC (UMC) shares does the CFO hold directly after the reported transactions?

After the reported transactions, Liu Chitung directly holds 4,322,917 Common Shares of UNITED MICROELECTRONICS CORP, including 1,210,000 shares of Restricted Stock Awards that vest in specified portions annually on December 5 from 2026 through 2029.

What indirect UMC shareholdings are reported for the CFO on this Form 4?

The filing shows 1,000,000 Common Shares held indirectly through CTBC Bank Trust and an additional 150,000 Common Shares held indirectly by Liu Chitung’s spouse, all reported as indirect ownership interests in UNITED MICROELECTRONICS CORP.

Was a Rule 10b5-1 trading plan involved in these UMC insider transactions?

No. The filing indicates that no Rule 10b5-1 trading plan was affirmed for these transactions; the document-level Rule 10b5-1 checkbox is explicitly unchecked, and there is no footnote indicating that the transactions occurred under a pre-arranged trading plan.

What does the Restricted Stock Award disclosure mean for UMC (UMC) shares held by the CFO?

The direct holdings include 1,210,000 shares of Restricted Stock Awards, with a specified number of these shares scheduled to vest annually on December 5 from 2026 through 2029, indicating a multi-year equity compensation schedule for the reporting person.

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

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Available on EDGAR 09/08/2026 - 06:02 AM Accepted by SEC EDGAR 09/08/2026 - 06:01 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)
09/07/2026

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	09/07/2026		J(1)		1,000,000	A	$0	4,322,917(2)	D
Common Shares	09/07/2026		J(1)		1,000,000	D	$0	1,000,000(3)	I	By CTBC Bank Trust
Common Shares								150,000	I	By Spouse

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. On September 7, 2026, the CTBC Bank Trust distributed 1,000,000 Common Shares of the Issuer to the Reporting Person due to the expiration and termination of the trust, resulting in a change in the form of the Reporting Person's ownership from indirect to direct.

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	09/08/2026
	** 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)