AMKOR TECHNOLOGY, INC. — Director's Dealing 2026

Feb 24, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: AMKOR TECHNOLOGY, INC. (AMKR)
CIK: 0001047127
Period of Report: 2026-02-20

Reporting Person: Engel Kevin K. (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-20	Common Stock	M	6359	—	Acquired	11304	Direct
2026-02-20	Common Stock	F	2597	$47.94	Disposed	8707	Direct
2026-02-20	Common Stock	M	10494	—	Acquired	19201	Direct
2026-02-20	Common Stock	F	4286	$47.94	Disposed	14915	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-20	Restricted Stock Units	$0	M	6359	Disposed		Common Stock (6359)	Direct
2026-02-20	Restricted Stock Units	$0	M	10494	Disposed		Common Stock (10494)	Direct

Footnotes

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.