X0306 4 2023-02-10 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001887579 Haghighi Farshad 2045 EAST INNOVATION CIRCLE TEMPE AZ 85284 0 1 0 0 Executive Vice President Common Stock 2023-02-10 4 M 0 657 0.00 A 1091 D Common Stock 2023-02-10 4 F 0 297 27.60 D 794 D Restricted Stock Units 0.00 2023-02-10 4 M 0 657 0.00 D Common Stock 657 1361 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 11, 2021 (the "Grant Date") pursuant to the Issuer's Second Amended and Restated 2007 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 2,723 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date. Mark N. Rogers, Attorney-in-Fact for Farshad Haghighi 2023-02-14