X0306 4 2020-12-17 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001158922 KIM SUSAN Y C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE PAOLI PA 19301-9713 1 0 1 1 See Exhibit 99.1 Common Stock 2020-12-17 4 S 0 1633226 15.41 D 38098901 I By Self as Trustee Common Stock 2020-12-17 4 S 0 816613 15.41 D 37282288 I By Self as Trustee Common Stock 2020-12-17 4 S 0 816613 15.41 D 36465675 I By Self as Trustee Common Stock 2020-12-17 4 S 0 816613 15.41 D 35649062 I By Self as Trustee Common Stock 30293021 D 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, or for any other purpose. On December 17, 2020, the James J. Kim 2008 Trust FBO Descendants of John T. Kim transferred 1,633,226 shares of Common Stock to Agnes C. Kim in payment of a Note. John T. Kim and Susan Y. Kim are co-trustees of the trust. On December 17, 2020, the James J. Kim 2008 Trust FBO Jacqueline Mary Panichello & Descendants transferred 816,613 shares of Common Stock to Agnes C. Kim in payment of a Note. John T. Kim and Susan Y. Kim are co-trustees of the trust. On December 17, 2020, the James J. Kim 2008 Trust FBO Dylan James Panichello & Descendants transferred 816,613 shares of Common Stock to Agnes C. Kim in payment of a Note. John T. Kim and Susan Y. Kim are co-trustees of the trust. On December 17, 2020, the James J. Kim 2008 Trust FBO Alexandra Kim Panichello & Descendants transferred 816,613 shares of Common Stock to Agnes C. Kim in payment of a Note. John T. Kim and Susan Y. Kim are co-trustees of the trust. Mark N. Rogers, Attorney-in-Fact for Susan Y. Kim 2020-12-21