X0508 4 2025-12-26 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001158840 KIM AGNES C C/O SIANA CARR O'CONNOR & LYNAM 1500 EAST LANCASTER AVENUE PAOLI PA 19301-9713 0 0 0 1 Member of 10% owner group (3) 0 Common Stock 2025-12-26 4 G 0 725000 0 A 10737355 I By Spouse Common Stock 0 D On December 26, 2025, the 2023 Grantor Retained Annuity Trust of Susan Y. Kim Dated 9/15/2023 distributed 725,000 shares of common stock of Amkor, Inc. (the "Issuer") to the Susan Y. Kim 2023 Family Distribution Trust. The spouse of the Reporting Person, James J. Kim, is a co-trustee of the Susan Y. Kim 2023 Family Distribution Trust. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended ("Section 16"), or for any other purpose. (3) The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities, except to the extent of the Reporting Person's pecuniary interest therein, for purposes of Section 16, or for any other purpose. /s/ Brian D. Short, Attorney-in-Fact for Agnes C. Kim 2025-12-30