UMC (NYSE: UMC) SVP Hung Kuei-Chun reports over 5.8M share stake on Form 3

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP senior vice president Hung Kuei-Chun filed an initial Form 3 detailing existing ownership in the company’s common shares. The filing shows 3,879,566 shares held directly and 2,000,000 shares held indirectly through CTBC Bank Trust. Footnotes explain that 1,127,500 of the direct shares are Restricted Stock Awards that will vest annually on December 5 from 2026 to 2029, and that the indirect shares are held under a Trust with Discretion Reserved.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider HUNG KUEI-CHUN

Role SVP

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

Holdings After Transaction: Common Shares — 3,879,566 shares (Direct, null); Common Shares — 2,000,000 shares (Indirect, By CTBC Bank Trust)

Footnotes (1)

Includes 1,127,500 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. The shares are under Trust with Discretion Reserved.

Key Figures

Direct common shares: 3,879,566 shares Indirect common shares: 2,000,000 shares Restricted Stock Awards: 1,127,500 shares +1 more

4 metrics

Direct common shares 3,879,566 shares Direct ownership balance reported on Form 3

Indirect common shares 2,000,000 shares Indirect ownership held by CTBC Bank Trust

Restricted Stock Awards 1,127,500 shares RSAs vesting annually on December 5 from 2026 to 2029

Unknown transaction entries 2 entries Holding entries with unknown transaction codes

Key Terms

Restricted Stock Award (RSA), Trust with Discretion Reserved, indirect ownership, Form 3

4 terms

Restricted Stock Award (RSA) financial

"Includes 1,127,500 shares of Restricted Stock Award (RSA) and a specified number of shares subject to the RSA will vest annually"

Trust with Discretion Reserved financial

"The shares are under Trust with Discretion Reserved."

indirect ownership financial

"direct_or_indirect: "I", nature_of_ownership: "By CTBC Bank Trust""

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 - 06:05 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

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1. Name and Address of Reporting Person^*

HUNG KUEI-CHUN

(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)
	SVP

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	3,879,566⁽¹⁾	D
Common Shares	2,000,000⁽²⁾	I	By CTBC Bank Trust

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 1,127,500 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.

2. The shares are under Trust with Discretion Reserved.

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 the UMC (UMC) Form 3 filing by Hung Kuei-Chun show?

The Form 3 shows Hung Kuei-Chun’s existing ownership in UMC common shares. It reports 3,879,566 shares held directly and 2,000,000 shares held indirectly through CTBC Bank Trust, with no new buy or sell transactions disclosed.

How many UNITED MICROELECTRONICS (UMC) shares does Hung Kuei-Chun hold directly and indirectly?

The filing reports 3,879,566 UMC common shares held directly and 2,000,000 shares held indirectly. The indirect position is held "By CTBC Bank Trust" under a trust structure described as "Trust with Discretion Reserved" in the footnotes.

What portion of Hung Kuei-Chun’s UMC holdings are Restricted Stock Awards (RSA)?

Footnotes state that 1,127,500 of Hung Kuei-Chun’s directly held UMC shares are Restricted Stock Awards. These RSAs are scheduled to vest in specified amounts each year on December 5 from 2026 through 2029, subject to the award terms.

How are the indirect UMC shares in the Form 3 held for Hung Kuei-Chun?

The Form 3 identifies 2,000,000 UMC common shares as indirectly owned "By CTBC Bank Trust." A footnote explains that these shares are under a "Trust with Discretion Reserved," indicating they are held through a trust arrangement associated with the reporting person.

Does the UMC Form 3 for Hung Kuei-Chun report any recent stock transactions?

The Form 3 functions as an initial ownership report and does not show explicit buy or sell transactions. The transaction codes are unspecified, and the entry types are labeled as holdings with share amounts reported as post-transaction balances only.