X0306 4 2020-12-17 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001426966 James J. Kim 2008 Trust FBO Dylan James Panichello & Descendants C/O SIANA CARR O'CONNOR & LYNAM, 1500 EAST LANCASTER AVENUE PAOLI PA 19301-9713 0 0 0 1 See Exhibit 99.1 Common Stock 2020-12-17 4 S 0 816613 15.41 D 546787 D On February 11, 2008, the Reporting Person acquired 1,363,400 shares of Common Stock from Agnes C. Kim in a private transaction and financed such purchase by issuing a promissory note (the "2008 Note"). On December 17, 2020, the Reporting Person transferred 816,613 shares of Common Stock to Agnes C. Kim in full payment of the principal and accrued interest of the 2008 Note payable to her by such Trust. John T. Kim and Susan Y. Kim are co-trustees of the trust. Richard D. Rosen, Attorney-in-Fact 2020-12-21