Amkor (NASDAQ: AMKR) CEO sells 12,500 shares following RSU vesting

Rhea-AI Filing Summary

Amkor Technology President and CEO Kevin K. Engel reported a mix of equity award activity and share sales. On February 24, 2026, he exercised 910 restricted stock units into 910 shares of common stock at $0.00 per share. To cover tax obligations from this vesting, 372 shares were withheld by Amkor at a reported price of $48.53 per share, with the company paying the related taxes on his behalf. Engel also executed an open-market sale of 12,500 shares of common stock at a reported price of $48.75 per share, with actual trades occurring between $48.73 and $48.81. After these transactions, he directly owned 2,953 shares of Amkor common stock.

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

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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^*

Engel Kevin K.

(Last) (First) (Middle)

2045 EAST INNOVATION CIRCLE

(Street)

TEMPE AZ 85284

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
AMKOR TECHNOLOGY, INC. [ AMKR ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
02/24/2026

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

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 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
Common Stock	02/24/2026		M		910	A	$0	15,825	D
Common Stock	02/24/2026		F(1)		372	D	$48.53	15,453	D
Common Stock	02/24/2026		S		12,500	D	$48.75(2)	2,953	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
Restricted Stock Units	$0(3)	02/24/2026		M			910	(3)	(3)	Common Stock	910	$0	0	D

Explanation of Responses:

1. The transaction represents shares withheld by Amkor Technology, Inc. (the "Issuer") in connection with the vesting of certain restricted stock units ("RSUs") granted to the Reporting Person on February 24, 2022 (the "Grant Date") pursuant to the Issuer's 2021 Equity Incentive Plan, as amended, and the related award agreement. These shares were withheld to satisfy the Reporting Person's tax withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person.

2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $48.73 to $48.81. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4.

3. Represents shares of the Issuer's common stock underlying time-vested RSUs on the Grant Date pursuant to the Issuer's Equity Incentive Plan. The RSUs were awarded for no consideration other than the Reporting Person's service as a service provider of the Issuer and vested in four equal annual installments beginning on the first anniversary of the Grant Date.

Remarks:

	/s/ Mark N. Rogers, Attorney-in-Fact for Kevin Engel	02/26/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What insider transactions did Amkor (AMKR) CEO Kevin Engel report?

Kevin Engel reported RSU vesting, tax-share withholding, and an open-market sale. He exercised 910 restricted stock units, had 372 shares withheld to cover taxes, and sold 12,500 common shares in the open market, all on February 24, 2026.

How many Amkor (AMKR) shares did the CEO sell in the open market?

Kevin Engel sold 12,500 shares of Amkor common stock in an open-market transaction. The reported price per share was $48.75, with individual trades executed in a range from $48.73 to $48.81, according to the Form 4 footnote disclosure.

What Amkor (AMKR) CEO shares were withheld for taxes on vested RSUs?

A total of 372 Amkor common shares were withheld to satisfy Kevin Engel’s tax obligations. These shares related to the vesting of restricted stock units granted in 2022, and Amkor paid the associated taxes on his behalf under its equity incentive plan.

How many Amkor (AMKR) shares does CEO Kevin Engel own after the Form 4 transactions?

Following the reported transactions, Kevin Engel directly owns 2,953 shares of Amkor common stock. This figure reflects the RSU conversion, tax-share withholding, and the 12,500-share open-market sale disclosed for February 24, 2026, in the Form 4 filing.

What equity award activity did Amkor (AMKR) disclose for its CEO?

Amkor disclosed vesting and settlement of time-vested restricted stock units for its CEO. Engel converted 910 RSUs into common shares granted under the 2021 Equity Incentive Plan, with the RSUs originally awarded in 2022 and vesting in four equal annual installments.