X0508 4 2023-09-06 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 2023-09-06 4 S 0 10000000 23.22 D 55020987 I By Spouse Common Stock 0 D On September 6, 2023, 915 Investments, LP sold 10,000,000 shares of Common Stock of Amkor Technology, Inc. pursuant to an underwritten secondary offering. The Reporting Person's spouse is the general partner of 915 Investments, LP. 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. (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, or for any other purpose. /s/ Brian D. Short, Attorney-in-Fact for Agnes C. Kim 2023-09-06