UMC (NYSE: UMC) vice president discloses 1.56M shares and RSAs on Form 3

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP vice president Hsu Shu-Fen has filed an initial Form 3 reporting existing share ownership. The filing shows direct ownership of 1,560,080 Common Shares and indirect ownership of 7,000 Common Shares held by a spouse.

The reported holdings include 828,800 shares of a Restricted Stock Award, with a specified number of those shares scheduled to vest annually on December 5 from 2026 through 2029.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider HSU SHU-FEN

Role Vice President

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

Holdings After Transaction: Common Shares — 1,560,080 shares (Direct, null); Common Shares — 7,000 shares (Indirect, By Spouse)

Footnotes (1)

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Key Figures

Direct Common Shares: 1,560,080 shares Indirect Common Shares (Spouse): 7,000 shares Restricted Stock Award included: 828,800 shares +2 more

5 metrics

Direct Common Shares 1,560,080 shares Total directly owned Common Shares reported on Form 3

Indirect Common Shares (Spouse) 7,000 shares Indirect ownership described as held "By Spouse"

Restricted Stock Award included 828,800 shares RSA shares included in reported holdings per footnote

RSA vesting schedule Annual vesting on Dec 5, 2026–2029 Specified number of RSA shares vest each year

Holding entries 2 entries Both transactions classified as holdings with unknown code

Key Terms

Restricted Stock Award (RSA), Common Shares, indirect ownership, Form 3

4 terms

Restricted Stock Award (RSA) financial

"Includes 828,800 shares of Restricted Stock Award (RSA) and a specified number of shares subject to the RSA will vest annually"

Common Shares financial

""security_title": "Common Shares" for both reported holdings"

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.

indirect ownership financial

""direct_or_indirect": "I" with nature_of_ownership described as "By Spouse""

Form 3 regulatory

"INSIDER FILING DATA (Form 3)"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

Understanding Insider Trading Forms →

05/07/2026 - 06:20 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^*

HSU SHU-FEN

(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	1,560,080⁽¹⁾	D
Common Shares	7,000	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)
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 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 Hsu Shu-Fen’s Form 3 filing for UMC report?

The Form 3 reports existing ownership, not new trades. It shows Hsu Shu-Fen holds 1,560,080 UMC Common Shares directly and 7,000 shares indirectly through a spouse, establishing baseline insider ownership for regulatory disclosure purposes.

How many UNITED MICROELECTRONICS (UMC) shares does Hsu Shu-Fen hold directly and indirectly?

The filing lists 1,560,080 UMC Common Shares as directly owned and 7,000 Common Shares as indirectly owned through a spouse. These figures together represent the total beneficial ownership reported on this initial Form 3 for the company’s vice president.

What are the Restricted Stock Awards disclosed in the UMC Form 3?

The footnote states the holdings include 828,800 shares of a Restricted Stock Award. A specified portion of these RSA shares is scheduled to vest annually on December 5 in each year from 2026 through 2029, subject to the award’s terms.

Does the UMC Form 3 show any insider buying or selling by Hsu Shu-Fen?

The Form 3 primarily records existing beneficial ownership and does not classify any entries as explicit purchases or sales. Both transactions are coded as holdings with an unknown transaction code, serving as a baseline disclosure rather than signaling new trades.

How is indirect ownership by spouse reported in the UMC Form 3?

The filing identifies 7,000 Common Shares as indirectly owned, with the nature of ownership described as “By Spouse.” This indicates those shares are held through a spouse but are still treated as part of Hsu Shu-Fen’s beneficial ownership under reporting rules.