UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended December 31, 2019 Commission File Number 000-29472 Amkor Technology, Inc. (Exact name of registrant as specified in its charter) Delaware 23-1722724 (State of incorporation) (I.R.S. Employer Identification Number) 2045 East Innovation Circle Tempe, AZ 85284 (480) 821-5000 (Address of principal executive of ices and zi ...