X0508 4 2025-11-04 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0002034170 John T. Kim 2024 GRAT #1 dtd. 08/09/2024 C/O SIANA CARR O'CONNOR & LYNAM 1500 EAST LANCASTER AVENUE PAOLI PA 19301-9713 0 0 0 1 Member of 10% owner group 0 Common Stock 2025-11-04 4 G 0 806000 0 D 1194000 D On November 4, 2025, the Reporting Person distributed 806,000 shares of the Common Stock of Amkor Technology, Inc (the "Issuer") to John T. Kim. John T. Kim is the sole trustee of the Reporting Person. Because John. T. Kim is the annuitant and sole trustee of the Reporting Person, the distribution was a mere change in the form of ownership from indirect to direct and thus being voluntarily reported by the Reporting Person on this Form 4. (2) The Reporting Person states that the filing of this Form 4 shall not be deemed an admission that the Reporting Person is the beneficial owner of the reported securities owned by the other members of the group, for the purpose of Section 16, or for any other purpose. /s/ Brian D. Short, Attorney-in-Fact 2025-11-06