[Form 3] UNITED MICROELECTRONICS CORP Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

United Microelectronics Corp Vice President Kuo Lin-Wu has filed an initial ownership report showing a substantial equity stake in the company. The filing lists direct ownership of 913,080 common shares. This total includes 808,800 shares granted as a Restricted Stock Award that will vest in stages each December 5 from 2026 through 2029.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider KUO LIN-WU

Role Vice President

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

Holdings After Transaction: Common Shares — 913,080 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Common shares owned: 913,080 shares Restricted Stock Award shares: 808,800 shares RSA vesting period: 2026-2029

3 metrics

Common shares owned 913,080 shares Direct ownership reported on Form 3

Restricted Stock Award shares 808,800 shares Included within reported common share holdings

RSA vesting period 2026-2029 RSA shares vest annually on December 5 from 2026 to 2029

Key Terms

Restricted Stock Award (RSA), vest annually, Common Shares

3 terms

Restricted Stock Award (RSA) financial

"Includes 808,800 shares of Restricted Stock Award (RSA) and a specified number"

vest annually financial

"a specified number of shares subject to the RSA will vest annually on December 5"

Common Shares financial

"security_title": "Common Shares""

Common shares are the basic units of ownership in a company that give holders a claim on profits and a right to vote on key matters, like electing the board. Think of them as membership cards in a club: they let you share in successes and losses, but in a bankruptcy or liquidation they are paid after creditors and preferred shareholders, so their value can swing more and matters for assessing risk and potential return.

Understanding Insider Trading Forms →

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

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1. Name and Address of Reporting Person^*

KUO LIN-WU

(Last) (First) (Middle)

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

(Street)

TAIPEI TAIWAN 11493

(City) (State) (Zip)

TAIWAN

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
04/29/2026

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

3a. Foreign Trading Symbol
[2303.TW]

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

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

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

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	913,080(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 808,800 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.

Remarks:

Exhibit List Exhibit 24: Power of Attorney

	/s/Chitung Liu, attorney-in-fact	05/07/2026
	** 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)

FAQ

What does the Form 3 filing by UMC Vice President Kuo Lin-Wu show?

The Form 3 shows Vice President Kuo Lin-Wu’s initial ownership in United Microelectronics Corp, reporting 913,080 common shares, including a large Restricted Stock Award grant that vests over several years starting in 2026.

How many UMC shares does KUO LIN-WU report owning on Form 3?

KUO LIN-WU reports direct ownership of 913,080 United Microelectronics Corp common shares. This figure combines fully owned stock and unvested Restricted Stock Award shares that are scheduled to vest between 2026 and 2029.

How many Restricted Stock Award (RSA) shares does UMC’s VP hold?

The filing states that 808,800 of KUO LIN-WU’s reported shares are Restricted Stock Award (RSA) shares. These RSAs represent stock-based compensation that will vest gradually instead of being immediately unrestricted.

When will KUO LIN-WU’s UMC Restricted Stock Awards vest?

The Form 3 notes that shares under the Restricted Stock Award will vest annually on December 5 from 2026 through 2029. This creates a four-year vesting schedule, aligning continued service with the release of additional shares.

Is KUO LIN-WU’s Form 3 at UMC a buy or sell transaction?

The Form 3 is not a buy or sell transaction. It is an initial ownership report that discloses KUO LIN-WU’s existing holdings in United Microelectronics Corp, including both common shares and unvested Restricted Stock Award shares.