X0508 4 2026-02-16 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001684564 Faust Megan 2045 E INNOVATION CIRCLE TEMPE AZ 85284 0 1 0 0 CFO 0 Common Stock 2026-02-16 4 M 0 4176 0 A 101214 D Common Stock 2026-02-16 4 F 0 1912 47.48 D 99302 D Restricted Stock Units 0 2026-02-16 4 M 0 4176 0 D Common Stock 4176 4175 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 16, 2023 (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. On the Grant Date, the Reporting Person was granted 16,703 RSUs which vest in four equal annual installments beginning on the first anniversary of the Grant Date. /s/ Mark N. Rogers, Attorney-in-Fact for Megan Faust 2026-02-18