X0508 4 2025-11-20 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0002034103 2024 Grantor Retained Annuity Trust of James J. Kim dtd. 8/5/2024 C/O SIANA CARR O'CONNOR & LYNAM 1500 EAST LANCASTER AVENUE PAOLI PA 19301-9713 0 0 0 1 Member of 10% owner group (2) 0 Common Stock 2025-11-20 4 G 0 965000 0 D 1235000 D On November 20, 2025, the Reporting Person distributed 965,000 shares of the Common Stock of the Amkor Technology, Inc. to the James J. Kim 2018-1 Qualified Annuity Trust U/A dated 8/30/18. James J. Kim and Susan Y. Kim are co-trustees of the trust. 2. 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 2025-11-24