UMC (NYSE: UMC) VP Hu Che-Jen discloses 3.22M common shares

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP Vice President Hu Che-Jen has reported an initial ownership position on a Form 3. The filing shows direct ownership of 3,224,080 Common Shares.

This total includes 828,800 shares of Restricted Stock Award (RSA), with a specified number of these RSA shares scheduled to vest each year on December 5 from 2026 through 2029. The Form 3 records holdings rather than any new purchase or sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider HU CHE-JEN

Role Vice President

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

Holdings After Transaction: Common Shares — 3,224,080 shares (Direct, null)

Footnotes (1)

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Key Figures

Total common shares held: 3,224,080 Common Shares Restricted Stock Awards: 828,800 shares RSA vesting period start: December 5, 2026 +1 more

4 metrics

Total common shares held 3,224,080 Common Shares Direct ownership reported on Form 3

Restricted Stock Awards 828,800 shares RSA included within total holdings

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

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

Key Terms

Restricted Stock Award (RSA), Common Shares, vesting

3 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" with 3,224,080 total shares following the reported holding"

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.

Understanding Insider Trading Forms →

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^*

HU CHE-JEN

(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	3,224,080(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)
	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)

FAQ

What does the UMC (UMC) Form 3 filed by Hu Che-Jen show?

The Form 3 shows Vice President Hu Che-Jen directly holding 3,224,080 Common Shares of UNITED MICROELECTRONICS CORP. This is an initial ownership report required for insiders and does not itself indicate a new purchase or sale of shares.

How many UMC shares does Hu Che-Jen beneficially own according to the Form 3?

According to the Form 3, Hu Che-Jen holds 3,224,080 Common Shares of UNITED MICROELECTRONICS CORP directly. This figure includes both unrestricted common stock and restricted stock awards reported as part of his overall beneficial ownership.

What are the Restricted Stock Awards (RSA) reported for UMC VP Hu Che-Jen?

The filing notes that Hu Che-Jen’s holdings include 828,800 shares of Restricted Stock Award (RSA). These are restricted shares granted to him that are subject to vesting conditions before they become fully transferable common stock.

When will Hu Che-Jen’s UMC Restricted Stock Awards vest?

The footnote explains that a specified number of the 828,800 RSA shares will vest annually on December 5 from 2026 through 2029. This creates a four-year vesting schedule tied to those calendar dates.

Does the UMC Form 3 for Hu Che-Jen show any recent stock transactions?

No transactions are indicated; the entry is categorized as a holding. The Form 3 primarily establishes Hu Che-Jen’s existing direct ownership in UNITED MICROELECTRONICS CORP rather than reporting a new buy or sell transaction.

Is Hu Che-Jen’s ownership in UMC direct or indirect on this Form 3?

The Form 3 classifies his ownership as direct, using ownership code “D”. This means the 3,224,080 Common Shares, including the 828,800 RSA shares, are reported as being directly held rather than through an intermediary entity.