X0306 4 2022-12-01 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001755764 Qualified Annuity Trust under the Susan Y. Kim 2018-1 Irrevocable Trust Agreement dtd August 29, 2018 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) Common Stock 2022-12-01 5 G 0 E 116500 0.00 D 1379943 D On December 1, 2022, the Reporting Person distributed 116,500 shares of the Common Stock of Amkor Technology, Inc. to Susan Y. Kim. James J. Kim and Susan Y. Kim are the 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 purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose. /s/ Richard D. Rosen, Attorney-in-Fact 2022-12-16