X0306 4 2022-01-18 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001158839 KIM JAMES J C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE PAOLI PA 19301-9713 1 0 1 1 Member of 10% owner group (4) Common Stock 2022-01-18 5 G 0 E 125600 23.86 D 1496443 I By Susan Y. Kim 2018-1 Qualified Annuity Trust Common Stock 1866552 D Common Stock 1855776 I By spouse Common Stock 49594980 I By 915 Investments, LP Common Stock 12678815 I By self as Trustee (excl. GRATs & Susan Y. Kim 2018-1 Qualified Annuity Trust) Common Stock 6430381 I By self as Trustee of GRATs On January 18, 2022, the Qualified Annuity Trust under the Susan Y. Kim 2018-1 Irrevocable Trust Agreement dtd August 29, 2018 distributed 125,600 shares of the Issuer's Common Stock to Susan Y. Kim. Susan Y. Kim and the reporting person are the co-trustees of the trust. The reporting person and Susan Y. Kim are father and daughter. The reporting person is (i) a trustee of family trusts for the benefit of his immediate family members which own 14,175,258 shares of the Issuer's Common Stock, (ii) a trustee of grantor retained annuity trusts of which he was the settlor and is the sole annuitant which own 6,430,381 shares of the Issuer's Common Stock and (iii) a general partner of a limited partnership which owns 49,594,980 shares of the Issuer's Common Stock. Pursuant to the Form 4 instructions, the reporting person is being treated as having a pecuniary interest in all of such shares. 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. 4. 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/ Richard D. Rosen, as Attorney-in-Fact 2022-01-27