X0508 4 2026-02-24 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001887579 Haghighi Farshad 2045 EAST INNOVATION CIRCLE TEMPE AZ 85284 0 1 0 0 Executive Vice President 0 Common Stock 2026-02-24 4 M 0 1814 0 A 24793 D Common Stock 2026-02-24 4 F 0 815 48.53 D 23978 D Common Stock 2026-02-25 4 S 0 15624 50.50 D 8354 D Restricted Stock Units 0 2026-02-24 4 M 0 1814 0 D Common Stock 1814 0 D 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. 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. /s/ Mark N. Rogers, Attorney-in-Fact for Farshad Haghighi 2026-02-26