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 and Amendment No. 6 filed with the
Commission on November 17, 2011, as further amended from time to time (the
"Schedule 13D"). Those individuals and entities listed in the Schedule 13D,
including the filers of Forms 3 filed on or about the date hereof by Susan Y.
Kim 2012 Irrevocable Trust U/A Dated 7/26/12, John T. Kim 2012
Generation-Skipping Trust U/A Dated 12/11/12 and John T. Kim Irrevocable Trust
U/A Dated 12/11/12 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 3 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.