X0609 4 2026-03-16 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001201997 ROGERS MARK N 2045 EAST INNOVATION CIRCLE TEMPE AZ 85284 0 1 0 0 EVP & General Counsel 1 Common Stock 2026-03-16 4 M 0 5000 7.40 A 43904 D Common Stock 2026-03-16 4 S 0 5000 44.54 D 38904 D Employee Stock Option (Right-to-Buy) 7.40 2026-03-16 4 M 0 5000 0 D 2020-06-10 2029-06-10 Common Stock 5000 95000 D The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 1, 2025. This stock option (the "Option") to acquire 200,000 shares of Amkor Technology, Inc. common stock (the "Option Shares") was granted on June 10, 2019 (the "Option Grant Date") and vested over four years as follows: (i) with respect to 25% of the Option Shares, on the first anniversary of the Option Grant Date; and (ii) with respect to the remainder of the Option Shares, in equal quarterly installments thereafter, such that 100% of the Option vested on the fourth anniversary of the Option Grant Date. /s/ Mark N. Rogers 2026-03-18