Kevin Engel - 14 Nov 2025 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Role: Executive Vice President
Signature: /s/ Mark N. Rogers, Attorney-in-Fact for Kevin Engel
Issuer symbol: AMKR
Transactions as of: 14 Nov 2025
Net transactions value: -$21,194
Form type: 4
Filing time: 18 Nov 2025, 16:33:58 UTC
Previous filing: 02 Oct 2025
Next filing: 16 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Engel Kevin	Executive Vice President	2045 EAST INNOVATION CIRCLE, TEMPE	/s/ Mark N. Rogers, Attorney-in-Fact for Kevin Engel	18 Nov 2025	0001965254

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMKR	Common Stock	Options Exercise	$0	+30	+0.26%	$0.000000	11,351	14 Nov 2025	Direct
transaction	AMKR	Common Stock	Tax liability	$950	-30	-0.26%	$31.68	11,321	14 Nov 2025	Direct	F1
transaction	AMKR	Common Stock	Options Exercise	$0	+47	+0.42%	$0.000000	11,368	14 Nov 2025	Direct
transaction	AMKR	Common Stock	Tax liability	$1,489	-47	-0.41%	$31.68	11,321	14 Nov 2025	Direct	F2
transaction	AMKR	Common Stock	Options Exercise	$0	+223	+2%	$0.000000	11,544	14 Nov 2025	Direct
transaction	AMKR	Common Stock	Tax liability	$7,065	-223	-1.9%	$31.68	11,321	14 Nov 2025	Direct	F3
transaction	AMKR	Common Stock	Options Exercise	$0	+369	+3.3%	$0.000000	11,690	14 Nov 2025	Direct
transaction	AMKR	Common Stock	Tax liability	$11,690	-369	-3.2%	$31.68	11,321	14 Nov 2025	Direct	F4

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	AMKR	Restricted Stock Units	Options Exercise	$0	-30	-3.2%	$0.000000	910	14 Nov 2025	Common Stock	30	$0.000000	Direct	F1
transaction	AMKR	Restricted Stock Units	Options Exercise	$0	-47	-1.7%	$0.000000	2,736	14 Nov 2025	Common Stock	47	$0.000000	Direct	F2
transaction	AMKR	Restricted Stock Units	Options Exercise	$0	-223	-1.7%	$0.000000	12,942	14 Nov 2025	Common Stock	223	$0.000000	Direct	F3
transaction	AMKR	Restricted Stock Units	Options Exercise	$0	-369	-1.1%	$0.000000	32,225	14 Nov 2025	Common Stock	369	$0.000000	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The reported transaction involved the withholding of 30 shares of common stock of Amkor Technology, Inc. (the "Issuer") issuable upon the early vesting of an equal number of restricted stock units ("RSUs") to pay taxes associated with the Reporting Person's retirement eligibility status.
F2	The reported transaction involved the withholding of 47 shares of the Issuer's common stock issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.
F3	The reported transaction involved the withholding of 223 shares of the Issuer's common stock issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.
F4	The reported transaction involved the withholding of 369 shares of the Issuer's common stock issuable upon the early vesting of an equal number of RSUs to pay taxes associated with the Reporting Person's retirement eligibility status.