X0306 5 2018-12-31 0 0 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001158839 KIM JAMES J 2045 EAST INNOVATION CIRCLE TEMPE AZ 85284 1 0 1 1 Exhibit 99.1 Common Stock 2018-02-21 5 J 0 63880 10.11 D 14489497 I By self as trustee Common Stock 2018-02-21 5 J 0 63880 10.11 A 54621203 D Common Stock 2018-04-04 5 J 0 2138382 9.63 D 14489497 I By self as trustee Common Stock 2018-07-09 5 J 0 7828682 8.85 D 14489497 I By self as trustee Common Stock 2018-07-09 5 J 0 7828682 8.85 A 14489497 I By self as trustee Common Stock 2018-09-07 5 J 0 2470150 7.86 D 54621203 D Common Stock 2018-09-07 5 J 0 2470150 7.86 A 14489497 I By self as trustee Common Stock 2018-09-21 5 J 0 941223 7.82 D 14489497 I By self as trustee Common Stock 2018-09-21 5 J 0 941223 7.82 A 54621203 D Common Stock 2018-10-05 5 J 0 1139605 7.16 D 14489497 I By self as trustee Common Stock 2018-10-05 5 J 0 1139605 7.16 D 14489497 I By self as trustee Common Stock 2018-10-08 5 J 0 2000000 6.93 A 14489497 I By self as trustee On February 21, 2018, the James J. Kim 2014 Qualified Annuity Trust U/A dated 10/13/14 distributed 63,880 shares to James J. Kim. James J. Kim and Susan Y. Kim are co- trustees. On April 4, 2018, the John T. Kim 2012 Irrevocable Trust U/A dated 12/11/12 transferred 2,138,382 shares of the Issuer's Common Stock to John T. Kim. John T. Kim and James J. Kim are co-trustees. On July 9, 2018, the John T. Kim 2012 Irrevocable Trust U/A dated 12/11/12 transferred 7,828,682 shares of the Issuer's Common Stock to the Family Trust under the John T. Kim 2012 Irrevocable Trust dated 12/11/12. John T. Kim and James J. Kim are co-trustees. On September 7, 2018, James J. Kim transferred 2,470,150 shares of the Issuer's Common Stock to the James J. Kim 2018-1 Qualified Annuity Trust U/A dtd 8/30/18. James J. Kim and Susan Y. Kim are co-trustees. On September 21, 2018, the James J. Kim 2013 Qualified Annuity Trust U/A Dated 5/17/13 distributed 941,223 shares of the Issuer's Common Stock to James J. Kim. James J. Kim and Susan Y. Kim are co-trustees. On October 5, 2018, the James J. Kim 2013 Qualified Annuity Trust U/A Dated 5/17/13 distributed 1,139,605 shares of the Issuer's Common Stock to Susan Y. Kim. James J. Kim and Susan Y. Kim are co-trustees. On October 5, 2018, the James J. Kim 2013 Qualified Annuity Trust U/A Dated 5/17/13 distributed 1,139,605 shares of the Issuer's Common Stock to John T. Kim. James J. Kim and Susan Y. Kim are co-trustees. On October 8, 2018, Susan Y. Kim transferred 2,000,000 shares of the Issuer's Common Stock to the Qualified Annuity Trust under the Susan Y. Kim 2018-1 Irrevocable Trust Agreement dtd 8/29/18. James J. Kim and Susan Y. Kim are co-trustees. 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. Jerry Allison, as Attorney in Fact 2019-02-14