UMC VP discloses 1.23M common share holdings

UNITED MICROELECTRONICS CORP vice president Lin Jen-Tsung filed an initial ownership report showing his equity stake in the company.

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP vice president Lin Jen-Tsung filed an initial ownership report showing his equity stake in the company. The filing reports direct ownership of 1,229,660 common shares. This total includes 714,600 shares granted as a Restricted Stock Award.

A specified number of these Restricted Stock Award shares will vest each year on December 5 from 2026 through 2029, meaning portions of the award become fully owned over time as service-based conditions are met. The filing does not report any new purchases or sales, only the existing holdings and vesting schedule.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider LIN JEN-TSUNG

Role Vice President

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

Holdings After Transaction: Common Shares — 1,229,660 shares (Direct)

Footnotes (1)

1. F1. Includes 714,600 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: 1,229,660 common shares Restricted Stock Award shares: 714,600 shares RSA vesting period start: December 5, 2026 +1 more

4 metrics

Direct common share holdings 1,229,660 common shares Total shares following reported holdings entry

Restricted Stock Award shares 714,600 shares Portion of total holdings designated as RSA

RSA vesting period start December 5, 2026 First annual vesting date for RSA shares

RSA vesting period end December 5, 2029 Final annual vesting date for RSA shares

Key Terms

Restricted Stock Award (RSA), Common Shares, vesting

3 terms

Restricted Stock Award (RSA) financial

"Includes 714,600 shares of Restricted Stock Award (RSA) and a specified number"

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.

vesting financial

"shares subject to the RSA will vest annually on December 5 from 2026 to 2029"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

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

What does the UMC (UMC) Form 3 filing by Lin Jen-Tsung show?

The Form 3 shows vice president Lin Jen-Tsung directly owns 1,229,660 common shares of United Microelectronics Corp. This is an initial ownership report, listing his existing stake and not indicating any recent share purchases or sales.

How many UMC (UMC) shares are restricted stock for Lin Jen-Tsung?

The filing states that 714,600 shares are a Restricted Stock Award (RSA). These restricted shares are part of his total 1,229,660 common shares and are subject to vesting conditions over several future years.

When will Lin Jen-Tsung’s UMC restricted stock awards vest?

The Form 3 notes that a specified number of Restricted Stock Award shares will vest annually on December 5 from 2026 to 2029. This means portions of the award become fully owned each year during that period.

Does the UMC (UMC) Form 3 show Lin Jen-Tsung buying or selling shares?

No. The Form 3 is an initial ownership filing and does not show any share purchases or sales. It simply reports that Lin Jen-Tsung directly holds 1,229,660 common shares, including 714,600 restricted stock award shares.

What type of security does Lin Jen-Tsung hold in UMC (UMC)?

The filing identifies the security as Common Shares of United Microelectronics Corp. Of the 1,229,660 common shares reported, 714,600 are designated as a Restricted Stock Award that will vest in stages from 2026 through 2029.

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

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Accepted by SEC EDGAR 05/07/2026 - 06:08 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

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

LIN JEN-TSUNG

(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	1,229,660(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 714,600 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)