X0508 4 2023-11-14 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001994770 Family Trust Under the Susan Y. Kim 2020-1 Irrevocable Trust Agreement Dated 04/01/2020 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 2023-11-14 4 G 0 1958355 0.00 D 0 D On November 14, 2023, the Reporting Person distributed 1,958,355 shares of Common Stock of Amkor Technology, Inc. to Kim Capital Partners - KCP, LLC. Susan Y. Kim and James J. Kim are co-trustees of the Reporting Person. (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 of the Securities Exchange Act of 1934, as amended, or for any other purpose. /s/ Brian D. Short, Attorney-in-Fact 2023-11-16