UMC executive reports 8.4M shares on Form 3

UNITED MICROELECTRONICS CORP director and President & COO Ming-Chih Hsu has filed an initial Form 3 reporting beneficial ownership of 8,403,220 common shares held directly.

Accepted by SEC EDGAR 03/18/2026 - 06:07 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP director and President & COO Ming-Chih Hsu has filed an initial Form 3 reporting beneficial ownership of 8,403,220 common shares held directly. This total includes 1,777,700 shares of Restricted Stock Awards that are scheduled to vest annually on December 5 from 2026 through 2029.

Insider Trade Summary

Holdings reported, no transactions

Holdings

Insider Hsu Ming-Chih

Role President & COO

Type	Security	Shares	Price	Value
Holding	Common Shares	--	--	--

Holdings: Common Shares — 8,403,220 shares (Direct)

Footnotes (1)

1. F1. Includes 1,777,700 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 Ming-Chih Hsu’s Form 3 filing for UMC show?

The Form 3 shows that Ming-Chih Hsu beneficially owns 8,403,220 common shares of UNITED MICROELECTRONICS CORP. These shares are held directly and form the baseline ownership disclosure as he serves as director and President & COO.

How many UMC shares does Ming-Chih Hsu hold according to this Form 3?

Ming-Chih Hsu reports beneficial ownership of 8,403,220 common shares of UNITED MICROELECTRONICS CORP. This figure represents his direct holdings as disclosed in the initial ownership statement filed with the SEC.

What portion of Ming-Chih Hsu’s UMC holdings are Restricted Stock Awards?

Out of the 8,403,220 common shares reported, 1,777,700 shares are Restricted Stock Awards. These RSAs are subject to vesting conditions and are part of his equity-based compensation at UNITED MICROELECTRONICS CORP.

When will Ming-Chih Hsu’s UMC Restricted Stock Awards vest?

The 1,777,700 Restricted Stock Award shares will vest in installments annually on December 5 from 2026 through 2029. Each year, a specified number of RSA shares becomes fully vested according to the company’s grant terms.

Does this UMC Form 3 indicate any recent insider buying or selling?

This Form 3 does not report any recent insider buying or selling activity. It is an initial ownership statement that records Ming-Chih Hsu’s existing holdings, including both unrestricted common shares and Restricted Stock Awards.

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

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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

OMB Number:			3235-0104
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1. Name and Address of Reporting Person^*

Hsu Ming-Chih

(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)
	President & COO

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	8,403,220(1)	D

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 1,777,700 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)