United Microelectronics officer reports 339K shares

UMC’s CHRO & VP Yen Hung-Yu reports 339,682 common shares of beneficial ownership, largely in restricted stock awards vesting between 2026 and 2029.

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP (UMC) has a new insider ownership report from CHRO & VP Yen Hung-Yu.

As of September 11, 2026, the reporting officer shows 339,682 Common Shares of beneficial ownership, held directly. This total includes 337,500 shares of a Restricted Stock Award (RSA), with portions scheduled to vest annually on December 5 from 2026 through 2029.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider YEN HUNG-YU

Role CHRO & VP

Type	Security	Shares	Price	Value
holding	Common Shares F1	--	--	--

Holdings After Transaction: Common Shares — 339,682 shares (Direct)

Footnotes (1)

1. F1. Includes 337,500 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.

Key Figures

Common Shares beneficially owned: 339,682 shares Restricted Stock Award (RSA) shares: 337,500 shares RSA vesting period: 2026–2029

3 metrics

Common Shares beneficially owned 339,682 shares Direct holdings reported by CHRO & VP Yen Hung-Yu as of September 11, 2026

Restricted Stock Award (RSA) shares 337,500 shares Included within total Common Shares beneficially owned by the reporting officer

RSA vesting period 2026–2029 RSA shares vest annually on December 5 from 2026 through 2029

Key Terms

Restricted Stock Award (RSA), beneficial ownership, Common Shares

3 terms

Restricted Stock Award (RSA) financial

"Includes 337,500 shares of Restricted Stock Award (RSA) and a specified"

beneficial ownership financial

"the reporting officer shows 339,682 Common Shares of beneficial ownership"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Common Shares financial

"the reporting officer shows 339,682 Common Shares of beneficial ownership"

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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider position is reported in UMC Form 3 for Yen Hung-Yu?

The Form 3 shows that CHRO & VP Yen Hung-Yu beneficially owns 339,682 Common Shares of UNITED MICROELECTRONICS CORP (UMC), held directly, as of September 11, 2026.

How many UMC (UMC) shares in the Form 3 are restricted stock awards?

Out of the total 339,682 Common Shares reported, 337,500 shares are part of a Restricted Stock Award (RSA), according to the footnote to the Form 3.

What is the vesting schedule of the RSA reported for UMC’s CHRO & VP?

The footnote states the 337,500-share RSA will vest in specified portions annually on December 5 from 2026 through 2029. Exact annual share amounts are not detailed in the summary data provided.

Does the UMC Form 3 show any recent buy or sell transactions by Yen Hung-Yu?

No buy or sell transactions are reported. The Form 3 presents a holding entry showing beneficial ownership of 339,682 Common Shares, including 337,500 RSA shares, but does not list purchase or sale activity.

Is the ownership reported by Yen Hung-Yu in UMC shares direct or indirect?

The Form 3 classifies the 339,682 Common Shares as held directly by the reporting officer, based on the ownership code provided.

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

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Available on EDGAR 09/18/2026 - 06:15 AM Accepted by SEC EDGAR 09/18/2026 - 06:14 AM Learn about SEC filing dates

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^*

YEN HUNG-YU

(Last) (First) (Middle)

8F, NO.68, SEC. 1, NEIHU RD.,

(Street)

TAIPEI 11493

(City) (State) (Zip)

TAIWAN

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
09/11/2026

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)
	CHRO & VP

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	339,682(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 337,500 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.

Remarks:

Exhibit List Exhibit 24: Power of Attorney

	/s/Chitung Liu, attorney-in-fact	09/18/2026
	** 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)