Exhibit 99.1

A Schedule 13D was filed by James J. Kim and those members of the reporting
group who then constituted the group on November 28, 2005, as amended by
Amendment No. 1 filed with the Securities and Exchange Commission (the
"Commission") on April 4, 2008, Amendment No. 2 filed with the Commission on
March 19, 2009, Amendment No. 3 filed with the Commission on April 16, 2009,
Amendment No. 4 filed with the Commission on February 5, 2010, Amendment No. 5
filed with the Commission on March 28, 2011, Amendment No. 6 filed with the
Commission on November 17, 2011, Amendment No. 7 filed with the Commission on
March 29, 2013, Amendment No. 8 filed with the Commission on March 28, 2014,
Amendment No. 9 filed with the Commission on March 30, 2015, Amendment No. 10
filed with the Commission on March 30, 2016, Amendment No. 11 filed with the
Commission on January 20, 2017, Amendment No. 12 filed with the Commission on
March 21, 2018 and Amendment No. 13 filed with the Commission on November 9,
2018 (as further amended from time to time, the "Schedule 13D").  Those
individuals and entities listed in the Schedule 13D, including the filer of this
Form 5, may be deemed to be members of a group (the "Group") who each exercise
voting or investment power with respect to shares of Amkor Technology, Inc.'s
(the "Issuer") Common Stock in concert with other members of the Group.  The
Group may be deemed to beneficially own more than 10% of the outstanding voting
securities of the Issuer. The reporting person states that the filing of this
Form 5 Report 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 of the Securities Exchange Act of 1934, as
amended, or for any other purpose.