X0508 4 2023-07-25 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001845367 Qualified Annuity Trust under the James J. Kim 2020-1 Annuity Trust Agreement dated 04/01/2020 C/O SIANA CARR O'CONNOR & LYNAM 1500 EAST LANCASTER AVENUE PAOLI PA 19301-971 0 0 0 1 Member of 10% owner group (3) 0 Common Stock 2023-07-25 4 G 0 443811 0.00 D 443811 D Common Stock 2023-07-25 4 G 0 443811 0.00 D 0 D On July 25, 2023, the Reporting Person distributed 443,811 shares of the Common Stock of Amkor Technology, Inc. (the "Issuer") to John T. Kim. James J. Kim and Susan Y. Kim are the co-trustees of the Reporting Person. On July 25, 2023, the Reporting Person distributed 443,811 shares of the Issuer's Common Stock to Susan Y. Kim. James J. Kim and Susan Y. Kim are the co-trustees of the Reporting Person. (3) 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 2023-07-27