Amkor (NASDAQ: AMKR) CEO sells shares and exercises RSUs

Rhea-AI Filing Summary

Amkor Technology President and CEO Kevin K. Engel reported multiple equity transactions. He sold 5,316 shares of common stock in an open-market transaction at $46.03 per share. He also acquired 1,345 shares of common stock through the exercise of restricted stock units, and 559 shares of common stock were withheld to cover tax obligations upon RSU vesting, with the issuer paying those taxes on his behalf.

Insider Trade Summary

Net Seller: 5,316 shares ($244,695)

Net Sell 4 txns

Insider Engel Kevin K.

Role President and CEO

Sold 5,316 shs ($245K)

Type	Security	Shares	Price	Value
Sale	Common Stock	5,316	$46.03	$245K
Exercise	Restricted Stock Units	1,345	$0.00	--
Exercise	Common Stock	1,345	$0.00	--
Tax Withholding	Common Stock	559	$47.48	$27K

Holdings After Transaction: Common Stock — 786 shares (Direct); Restricted Stock Units — 1,391 shares (Direct)

Footnotes (1)

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 16, 2023 (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. On the Grant Date, the Reporting Person was granted 5,567 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date.

Form 4 Insider Transactions: What Each Field Means →

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^*

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)
02/16/2026

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	02/16/2026		M		1,345	A	$0	6,661	D
Common Stock	02/16/2026		F(1)		559	D	$47.48	6,102	D
Common Stock	02/17/2026		S		5,316	D	$46.03	786	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(2)	02/16/2026		M			1,345	(2)	(2)	Common Stock	1,345	$0	1,391	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 16, 2023 (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. On the Grant Date, the Reporting Person was granted 5,567 RSUs which vest 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	02/18/2026
	** 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 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.

FAQ

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

Kevin K. Engel reported selling 5,316 Amkor common shares at $46.03, exercising 1,345 restricted stock units into common shares, and having 559 shares withheld to pay taxes related to RSU vesting, with Amkor paying those taxes on his behalf.

How many Amkor (AMKR) shares did the CEO sell and at what price?

The CEO sold 5,316 shares of Amkor common stock in an open-market transaction at $46.03 per share. This transaction is classified as a sale in the Form 4, separate from RSU exercises and tax-withholding share dispositions reported on the prior day.

What RSU-related transactions did Amkor (AMKR) disclose for its CEO?

The filing shows 1,345 restricted stock units were converted into Amkor common shares, and 559 common shares were withheld to satisfy tax obligations tied to RSU vesting. These RSUs came from a 5,567-unit grant that vests in four equal annual installments.

How were taxes handled on the Amkor (AMKR) CEO’s RSU vesting?

To cover taxes on vested restricted stock units, 559 Amkor common shares were withheld. The company will pay the related tax obligations on behalf of Kevin K. Engel, as described in the footnote referencing the equity incentive plan and award agreement.

What is the vesting schedule of the Amkor (AMKR) CEO’s RSUs mentioned in the filing?

On February 16, 2023, the CEO received 5,567 restricted stock units that vest in four equal annual installments. The first installment vests on the first anniversary of the grant date, with remaining installments vesting annually thereafter under the equity incentive plan.

Are the Amkor (AMKR) CEO’s tax-withholding share dispositions open-market sales?

No. The 559-share disposition is classified as a tax-withholding transaction, not an open-market sale. These shares were withheld by Amkor in connection with RSU vesting so the company can pay the CEO’s tax obligations arising from that vesting event.