United Micro VP sells 10K shares at NT$163

UMC’s vice president sold 10,000 shares but still directly holds over 1.17 million, including a large restricted stock award vesting from 2026 to 2029.

Rhea-AI Filing Summary

United Microelectronics Corp (UMC) reported that Vice President Lin Jen-Tsung sold 10,000 common shares on September 22, 2026, in an open-market or private transaction at NT$163.00 per share. After this sale, he holds 1,172,140 shares directly, including 667,080 Restricted Stock Award (RSA) shares that will vest in portions annually on December 5 from 2026 through 2029.

Insider Trade Summary

Net Seller: 10,000 shares

Net Sell 1 txn

Insider LIN JEN-TSUNG

Role Vice President

Sold 10,000 shs ($1.63M)

Type	Security	Shares	Price	Value
Sale	Commin Shares F1, F2	10,000	$163.00	$1.63M

Holdings After Transaction: Commin Shares — 1,172,140 shares (Direct)

Footnotes (2)

1. F1. New Taiwan Dollars
2. F2. Includes 667,080 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

Shares sold: 10,000 shares Sale price: NT$163.00 per share Shares held after transaction: 1,172,140 shares +3 more

6 metrics

Shares sold 10,000 shares Non-derivative sale by Vice President Lin Jen-Tsung on September 22, 2026

Sale price NT$163.00 per share Price for the 10,000 shares sold; currency noted as New Taiwan Dollars

Shares held after transaction 1,172,140 shares Direct ownership reported following the September 22, 2026 sale

Restricted Stock Award (RSA) shares 667,080 shares Included in post-transaction direct holdings and subject to vesting

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

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

Key Terms

Restricted Stock Award (RSA), vesting, New Taiwan Dollars

3 terms

Restricted Stock Award (RSA) financial

"Includes 667,080 shares of Restricted Stock Award (RSA) and a specified number"

vesting financial

"a specified number of 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.

New Taiwan Dollars financial

"New Taiwan Dollars"

The New Taiwan Dollar (NTD) is the official currency used in Taiwan for everyday transactions, like buying groceries or paying bills. For investors, it matters because its value can influence Taiwan’s economy and affect the profitability of investments related to the region. Changes in the currency’s strength can also impact international trade and financial markets involving Taiwan.

FAQ

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

What insider transaction did UMC report for Vice President Lin Jen-Tsung?

UMC reported that Vice President Lin Jen-Tsung sold 10,000 common shares on September 22, 2026, in a sale characterized as an open-market or private transaction.

At what price were the 10,000 UMC (UMC) shares sold by the vice president?

The 10,000 shares were sold at NT$163.00 per share, with the currency specified as New Taiwan Dollars in the filing’s footnotes.

How many UMC (UMC) shares does the insider hold after this transaction?

After the sale, Vice President Lin Jen-Tsung directly holds 1,172,140 shares of UMC, according to the reported post-transaction ownership figure.

How many restricted UMC (UMC) shares are included in the insider’s holdings?

The post-transaction holdings include 667,080 shares of Restricted Stock Award (RSA), as disclosed in the footnotes to the Form 4.

When will the UMC (UMC) Restricted Stock Award shares vest for the insider?

A specified portion of the 667,080 RSA shares will vest annually on December 5 from 2026 to 2029, according to the footnote description.

Was the UMC (UMC) insider sale made under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is marked negative, indicating no Rule 10b5-1 trading plan is affirmed for this reported transaction.

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

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Available on EDGAR 09/22/2026 - 06:12 AM Accepted by SEC EDGAR 09/22/2026 - 06:11 AM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

LIN JEN-TSUNG

(Last) (First) (Middle)

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

(Street)

TAIPEI 11493

(City) (State) (Zip)

TAIWAN

(Country)

2. Issuer Name and Ticker or Trading Symbol
UNITED MICROELECTRONICS CORP [ UMC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Vice President

2a. Foreign Trading Symbol
[2303.TW]

3. Date of Earliest Transaction (Month/Day/Year)
09/22/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Commin Shares	09/22/2026		S		10,000	D	$163(1)	1,172,140(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. New Taiwan Dollars

2. Includes 667,080 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.

	/s/Chitung Liu, attorney-in-fact	09/22/2026
	** 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 4 (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 4: SEC 1474 (03-26)