UMC (NYSE: UMC) vice president reports 2.18M-share stake with pledged and RSA stock

Q: What does UMC Vice President LIU SHIH-WEI report on this Form 3?

The Form 3 reports that LIU SHIH-WEI directly holds 2,183,080 common shares of UNITED MICROELECTRONICS CORP. This is an initial ownership disclosure rather than a new buy or sell transaction, establishing the baseline equity position as an officer.

Q: How many UMC shares are pledged as collateral by LIU SHIH-WEI?

The filing notes that 1,296,000 common shares are pledged as collateral to secure certain obligations of LIU SHIH-WEI. These shares remain owned by the insider but are encumbered by the pledge arrangement described in the disclosure.

Q: What Restricted Stock Awards (RSA) does LIU SHIH-WEI hold in UMC?

The disclosure states LIU SHIH-WEI holds 828,800 shares of Restricted Stock Awards (RSA) . These awards are part of equity-based compensation and are subject to vesting conditions before becoming fully unrestricted common shares owned outright.

Q: When will LIU SHIH-WEI’s UMC Restricted Stock Awards vest?

A specified number of shares subject to the 828,800-share RSA grant will vest annually on December 5 from 2026 to 2029 . Vesting means the restrictions lift over time, turning the awards into fully owned common shares.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP Vice President LIU SHIH-WEI has reported initial share holdings. The filing shows direct ownership of 2,183,080 common shares. This includes 1,296,000 shares pledged as collateral for certain obligations and 828,800 shares granted as Restricted Stock Awards that will vest annually on December 5 from 2026 to 2029.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider LIU SHIH-WEI

Role Vice President

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

Holdings After Transaction: Common Shares — 2,183,080 shares (Direct, null)

Footnotes (1)

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Key Figures

Total common shares held: 2,183,080 shares Shares pledged as collateral: 1,296,000 shares Restricted Stock Awards: 828,800 shares +1 more

4 metrics

Total common shares held 2,183,080 shares Direct ownership reported on Form 3 by LIU SHIH-WEI

Shares pledged as collateral 1,296,000 shares Common shares pledged to secure certain obligations

Restricted Stock Awards 828,800 shares RSA grant subject to vesting

RSA vesting schedule Annually on December 5, 2026-2029 Vesting dates for RSA shares

Key Terms

Restricted Stock Award (RSA), pledged as collateral, vest annually

3 terms

Restricted Stock Award (RSA) financial

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

pledged as collateral financial

"Includes 1,296,000 shares of common stock pledged as collateral to secure certain obligations"

vest annually financial

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

Understanding Insider Trading Forms →

05/07/2026 - 06:19 AM

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^*

LIU SHIH-WEI

(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	2,183,080⁽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)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	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)

Explanation of Responses:

1. Includes 1,296,000 shares of common stock pledged as collateral to secure certain obligations of the reporting person, 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)

Source: View Original Filing on SEC EDGAR

FAQ

What does UMC Vice President LIU SHIH-WEI report on this Form 3?

The Form 3 reports that LIU SHIH-WEI directly holds 2,183,080 common shares of UNITED MICROELECTRONICS CORP. This is an initial ownership disclosure rather than a new buy or sell transaction, establishing the baseline equity position as an officer.

How many UMC shares are pledged as collateral by LIU SHIH-WEI?

The filing notes that 1,296,000 common shares are pledged as collateral to secure certain obligations of LIU SHIH-WEI. These shares remain owned by the insider but are encumbered by the pledge arrangement described in the disclosure.

What Restricted Stock Awards (RSA) does LIU SHIH-WEI hold in UMC?

The disclosure states LIU SHIH-WEI holds 828,800 shares of Restricted Stock Awards (RSA). These awards are part of equity-based compensation and are subject to vesting conditions before becoming fully unrestricted common shares owned outright.

When will LIU SHIH-WEI’s UMC Restricted Stock Awards vest?

A specified number of shares subject to the 828,800-share RSA grant will vest annually on December 5 from 2026 to 2029. Vesting means the restrictions lift over time, turning the awards into fully owned common shares.

Does this UMC Form 3 show any insider buying or selling activity?

No buy or sell transactions are indicated in this disclosure. It classifies the entry as a holding, with transaction codes showing unknown direction and a focus on reporting existing ownership and pledged and restricted share details, rather than recent trading activity.