X0508 4 2025-11-20 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 2025-11-20 4 G 0 705000 0 A 705000 I By trusts Common Stock 12290281 I By Spouse On November 20, 2025, the 2024 Grantor Retained Annuity Trust of Agnes C. Kim 8/5/2024 distributed 705,000 shares of the Common Stock of Amkor Technology, Inc (the "Issuer") to the Agnes C. Kim Revocable Trust, of which the Reporting Person is the settlor, sole trustee, and sole beneficiary. Susan Y. Kim is the sole trustee of the 2024 Grantor Retained Annuity Trust of Agnes C. Kim 8/5/2024. James J. Kim is the spouse of the Reporting Person. 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. /s/ Brian D. Short, Attorney-in-Fact for Agnes C. Kim 2025-11-24