UMC chairman Hung Chia-Tsung reports holdings

UNITED MICROELECTRONICS CORP director Hung Chia-Tsung has filed an initial ownership report showing substantial common share holdings.

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP director Hung Chia-Tsung has filed an initial ownership report showing substantial common share holdings. He reports direct ownership of 63,241,892 common shares, which includes 3,515,400 shares of Restricted Stock Awards that are scheduled to vest annually on December 5 from 2026 to 2029.

He also reports indirect ownership of 1,269,435 common shares held by his spouse. This Form 3 does not reflect new buying or selling activity; it establishes Hung’s current equity position in the company as he serves as Chairman and Chief Strategy Officer.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Hung Chia-Tsung

Role Chairman & CSO

Type	Security	Shares	Price	Value
holding	Common Shares	--	--	--
holding	Common Shares	--	--	--

Holdings After Transaction: Common Shares — 63,241,892 shares (Direct); Common Shares — 1,269,435 shares (Indirect, By Spouse)

Footnotes (1)

1. F1. Includes 3,515,400 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.

FAQ

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

What does Hung Chia-Tsung’s Form 3 filing show for UMC?

The Form 3 shows Hung Chia-Tsung’s existing ownership in UNITED MICROELECTRONICS CORP, including 63,241,892 common shares held directly and 1,269,435 common shares held indirectly through his spouse, establishing his starting equity position as a director and Chairman & CSO.

How many UMC shares does Hung Chia-Tsung own directly and indirectly?

Hung reports direct ownership of 63,241,892 UMC common shares and indirect ownership of 1,269,435 common shares held by his spouse. These figures together outline the equity stake associated with his role as a director and senior executive at the company.

What Restricted Stock Awards are included in Hung Chia-Tsung’s UMC holdings?

His direct holdings include 3,515,400 UMC shares of Restricted Stock Awards. A specified number of these RSA shares will vest annually on December 5 from 2026 to 2029, indicating part of his compensation is tied to future stock vesting.

Does Hung Chia-Tsung’s UMC Form 3 indicate recent share purchases or sales?

The Form 3 does not indicate recent purchases or sales. It records Hung Chia-Tsung’s current direct and indirect ownership positions in UMC common shares, serving as an initial disclosure rather than a report of new trading activity in the company’s stock.

How are Hung Chia-Tsung’s spouse’s UMC shares reported in the Form 3?

The filing reports 1,269,435 UMC common shares as indirectly owned, described as held "By Spouse." This indicates those shares are attributed to Hung for reporting purposes, even though legal title is in his spouse’s name, a standard practice in insider ownership reporting.

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

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Accepted by SEC EDGAR 03/18/2026 - 06:04 AM Learn about SEC filing dates

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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

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1. Name and Address of Reporting Person^*

Hung Chia-Tsung

(Last) (First) (Middle)

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

(Street)

TAIPEI TAIWAN 11493

(City) (State) (Zip)

TAIWAN, PROVINCE OF CHINA

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

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

3a. Foreign Trading Symbol
[2,303]

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

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chairman & CSO

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

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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Shares	63,241,892(1)	D
Common Shares	1,269,435	I	By Spouse

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Includes 3,515,400 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.

Remarks:

Exhibit 24 Power of Attorney.

	/s/Chitung Liu, attorney-in-fact	03/18/2026
	** 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 5 (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 3: SEC 1473 (03-26)