ITEM 1.
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SECURITY AND ISSUER.
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This Amendment No. 13 (the Amendment) amends the Statement on Schedule 13D filed with the Securities and Exchange Commission
(the Commission) on November 28, 2005, as amended by Amendment No. 1 filed with 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 March 28, 2011,
Amendment No. 7 filed with the Commission on March 24, 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, and Amendment No. 12 filed with the Commission on March 21, 2018, by the reporting persons who then constituted the Group and
relates to the common stock, $0.001 par value per share (the Common Stock), of Amkor Technology, Inc., a Delaware corporation (Amkor or the Issuer). The principal executive offices of Amkor are located at 2045
East Innovation Circle, Tempe, Arizona 85284, previously having been located at 1900 South Price Road, Chandler, Arizona 85286.
This
Amendment is being filed to report (i) on March 13, 2018, the Susan Y. Kim 2012 Irrevocable Trust U/A dated 7/26/12 transferred 2,779,777 shares of the Issuers Common Stock to the Susan Y. Kim Family Trust under said Trust Agreement,
(ii) on March 23, 2018, John T. Kim transferred 1,789,775 shares of the Issuers Common Stock to the Qualified Annuity Trust under the John T. Kim 2018 Irrevocable Trust Agreement dated 2/6/18, (iii) on April 4, 2018, the John T.
Kim 2012 Irrevocable Trust U/A dated 12/11/12 transferred 2,138,382 shares of the Issuers Common Stock to John T. Kim, (iv) on May 1, 2018, Susan Y. Kim was granted options to purchase 20,000 shares of the Issuers Common Stock
and 4,700 restricted shares of the Issuers Common Stock as reported on a Form 4 filed on May 1, 2018, (v) on July 9, 2018, the John T. Kim Irrevocable Trust U/A dated 12/11/12 transferred 7,828,682 shares of the Issuers Common
Stock to the Family Trust under the John T. Kim 2012 Irrevocable Trust Agreement dated 12/11/12, (vi) on August 16, 2018, the Susan Y. Kim 2015 Irrevocable Trust U/A dated 3/16/15 transferred 560,450 shares of the Issuers Common Stock to
Susan Y. Kim, (vii) on September 7, 2018, James J. Kim transferred 2,470,150 shares of the Issuers Common Stock to the James J. Kim
2018-1
Qualified Annuity Trust U/A dated 8/30/18, (viii) on
September 21, 2018, the James J. Kim 2013 Qualified Annuity Trust U/A dated 5/17/13 transferred 941,223 shares of the Issuers Common Stock to James J. Kim, (ix) on October 5, 2018, the James J. Kim 2013 Qualified Annuity Trust
U/A dated 5/17/13 transferred 1,139,605 shares of the Issuers Common Stock to Susan Y. Kim, (x) on October 5, 2018, the James J. Kim 2013 Qualified Annuity Trust U/A dated 5/17/13 transferred 1,139,605 shares of the Issuers
Common Stock to John T. Kim, (xi) on October 8, 2018, Susan Y. Kim transferred 2,000,000 shares of the Issuers Common Stock to the Qualified Annuity Trust under the Susan Y. Kim
2018-1
Irrevocable Trust Agreement dated 8/29/18, and (xii) on October 31, 2018, 4,085,000 shares of the Issuers Common Stock were transferred from Turquoise Investments Ltd., a Cayman Islands corporation, to James J. Kim. All of the stock
of Turquoise Investments Ltd. is owned by Swallow Ltd., a Cayman Islands corporation. All of the stock of Swallow Ltd. is owned by an irrevocable trust created May 10, 1994 of which James J. Kim is the sole beneficiary. Turquoise Investments
Ltd. and Swallow Ltd. are being dissolved and the trust is being terminated.
ITEM 2.
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IDENTITY AND BACKGROUND.
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(a) This Amendment is being filed by the Group and separately by each of the following persons comprising the Group (each a Reporting
Person):
i. James J. Kim
ii. James J. Kim, as Trustee
iii. Agnes C. Kim
iv. John T.
Kim
v. John T. Kim, as Trustee
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