UMC VP reports 170,000 restricted share holding

UNITED MICROELECTRONICS CORP Vice President Lu Chia-Ao reports holdings of 170,000 common shares.

Accepted by SEC EDGAR 05/07/2026 - 06:26 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP Vice President Lu Chia-Ao reports holdings of 170,000 common shares. These shares are described as a Restricted Stock Award, with specified portions scheduled to vest each year on December 5 from 2026 through 2029.

Insider Trade Summary

Holdings reported, no transactions

Holdings

Insider LU CHIA-AO

Role Vice President

Type	Security	Shares	Price	Value
Holding	Common Shares	--	--	--

Holdings: Common Shares — 170,000 shares (Direct)

Footnotes (1)

1. F1. Includes 170,000 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

Restricted shares held: 170,000 shares Vesting start year: 2026 Vesting end year: 2029

3 metrics

Restricted shares held 170,000 shares Common Shares under Restricted Stock Award as of initial disclosure

Vesting start year 2026 First annual vesting date on December 5

Vesting end year 2029 Final annual vesting date on December 5

Key Terms

Restricted Stock Award (RSA), Common Shares, vesting

3 terms

Restricted Stock Award (RSA) financial

"Includes 170,000 shares of Restricted Stock Award (RSA)"

Common Shares financial

"security_title: Common Shares for Lu Chia-Ao"

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"

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 insider position does Lu Chia-Ao hold at UMC (UMC)?

Lu Chia-Ao is disclosed as a Vice President of United Microelectronics Corp. The filing identifies this role explicitly while detailing existing equity holdings in the company’s common shares through a Restricted Stock Award structure.

How many UMC (UMC) shares does Lu Chia-Ao beneficially own?

Lu Chia-Ao is shown as holding 170,000 common shares of United Microelectronics Corp. Footnotes clarify that these are part of a Restricted Stock Award, with portions scheduled to vest over several future years.

What type of equity does Lu Chia-Ao hold in UMC (UMC)?

The disclosure states that Lu Chia-Ao’s holdings include 170,000 shares of a Restricted Stock Award (RSA). These are common shares subject to vesting conditions rather than unrestricted stock currently available for sale.

When will Lu Chia-Ao’s UMC (UMC) restricted shares vest?

The footnote explains that a specified number of shares under the Restricted Stock Award will vest annually on December 5 from 2026 to 2029. This creates a multi-year vesting schedule for the award.

Does this UMC (UMC) insider disclosure show any recent share purchases or sales?

The information highlights holdings of 170,000 restricted shares but does not identify any open-market purchases or sales. It primarily provides an initial snapshot of equity owned rather than recording a new trading transaction.

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

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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^*

LU CHIA-AO

(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)
05/01/2026

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	170,000(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 170,000 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)