UMC vice president reports share ownership

UNITED MICROELECTRONICS CORP vice president Lin Ming-Yu filed an initial ownership report detailing holdings of the company’s common shares.

Accepted by SEC EDGAR 05/07/2026 - 06:21 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP vice president Lin Ming-Yu filed an initial ownership report detailing holdings of the company’s common shares. The filing shows 3,543,005 shares held directly and 781,408 shares held indirectly through a spouse. A footnote states the position includes 828,800 Restricted Stock Award shares that will vest annually on December 5 from 2026 to 2029.

Insider Trade Summary

Holdings reported, no transactions

Holdings

Insider LIN MING-YU

Role Vice President

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

Holdings: Common Shares — 3,543,005 shares (Direct); Common Shares — 781,408 shares (Indirect, By Spouse)

Footnotes (1)

1. F1. Includes 828,800 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.

Key Figures

Direct common share holdings: 3,543,005 shares Indirect common share holdings (spouse): 781,408 shares Restricted Stock Award shares: 828,800 shares

3 metrics

Direct common share holdings 3,543,005 shares Total common shares held directly after reported holdings

Indirect common share holdings (spouse) 781,408 shares Common shares held indirectly through spouse after reported holdings

Restricted Stock Award shares 828,800 shares RSA included in holdings; vest annually on December 5 from 2026 to 2029

Key Terms

Restricted Stock Award (RSA), indirect ownership, Common Shares

3 terms

Restricted Stock Award (RSA) financial

"Includes 828,800 shares of Restricted Stock Award (RSA) and a specified number..."

indirect ownership financial

"total_shares_following_transaction 781408.0000, direct_or_indirect I, nature_of_ownership By Spouse"

Common Shares financial

"security_title Common Shares, transaction_type holding, total_shares_following_transaction"

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.

FAQ

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

What does the UMC Form 3 filing by Lin Ming-Yu report?

The Form 3 filing reports Lin Ming-Yu’s existing ownership of UNITED MICROELECTRONICS CORP common shares, not a new trade. It discloses direct and indirect holdings plus restricted stock awards that vest in future years, giving a baseline of this executive’s equity position.

How many UNITED MICROELECTRONICS (UMC) shares does Lin Ming-Yu hold directly?

The filing shows Lin Ming-Yu directly holds 3,543,005 UNITED MICROELECTRONICS CORP common shares. This direct position reflects shares registered in the executive’s own name, separate from any indirect holdings through related persons or entities disclosed in the same report.

What indirect UMC share ownership is reported for Lin Ming-Yu?

The report lists 781,408 UNITED MICROELECTRONICS CORP common shares as indirectly owned "By Spouse." This indicates the shares are held in a spouse’s name but are still reportable for beneficial ownership purposes, giving investors visibility into total associated holdings.

What are the Restricted Stock Awards (RSA) mentioned in the UMC Form 3?

A footnote explains the holdings include 828,800 shares of Restricted Stock Award (RSA). These RSAs are subject to vesting conditions, with a specified number of shares scheduled to vest each year on December 5 from 2026 through 2029, increasing freely owned shares over time.

Does the UMC Form 3 show any recent buying or selling by Lin Ming-Yu?

The Form 3 functions as an initial ownership statement and does not show explicit buy or sell transactions. Instead, it lists the total direct and indirect common share holdings and notes restricted stock awards, establishing a starting point for future transaction reporting obligations.

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
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

LIN MING-YU

(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	3,543,005(1)	D
Common Shares	781,408	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 828,800 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)