Farshad Haghighi - 20 Feb 2026 Form 4 Insider Report for AMKOR TECHNOLOGY, INC. (AMKR)

Role: Executive Vice President
Signature: /s/ Mark N. Rogers, Attorney-in-Fact for Farshad Haghighi
Issuer symbol: AMKR
Transactions as of: 20 Feb 2026
Net transactions value: -$379,062
Form type: 4
Filing time: 24 Feb 2026, 16:06:25 UTC
Previous filing: 20 Feb 2026
Next filing: 26 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Haghighi Farshad	Executive Vice President	2045 EAST INNOVATION CIRCLE, TEMPE	/s/ Mark N. Rogers, Attorney-in-Fact for Farshad Haghighi	24 Feb 2026	0001887579

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMKR	Common Stock	Options Exercise	$0	+7,153	+54%	$0.000000	20,418	20 Feb 2026	Direct
transaction	AMKR	Common Stock	Tax liability	$153,887	-3,210	-16%	$47.94	17,208	20 Feb 2026	Direct	F1
transaction	AMKR	Common Stock	Options Exercise	$0	+10,468	+61%	$0.000000	27,676	20 Feb 2026	Direct
transaction	AMKR	Common Stock	Tax liability	$225,174	-4,697	-17%	$47.94	22,979	20 Feb 2026	Direct	F2

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	-7,153	-49%	$0.000000	7,424	20 Feb 2026	Common Stock	7,153	$0.000000	Direct	F3
transaction	AMKR	Restricted Stock Units	Options Exercise	$0	-10,468	-33%	$0.000000	21,731	20 Feb 2026	Common Stock	10,468	$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 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 20, 2024 (the "2024 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.
F2	The transaction represents shares withheld by the Issuer in connection with the vesting of certain RSUs granted to the Reporting Person on February 20, 2025 (the "2025 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.
F3	Represents shares of the Issuer's common stock underlying time-vested RSUs on the 2024 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 an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the 2024 Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the 2024 Grant Date.
F4	Represents shares of the Issuer's common stock underlying time-vested restricted stock units granted on the 2025 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 an officer of the Issuer and will vest in three equal annual installments beginning on the first anniversary of the 2025 Grant Date and annually thereafter, such that 100% will be vested on the third anniversary of the 2025 Grant Date.