X0306 4 2022-11-15 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001887579 Haghighi Farshad 2045 EAST INNOVATION CIRCLE TEMPE AZ 85284 0 1 0 0 Executive Vice President Common Stock 2022-11-15 4 M 0 6250 9.48 A 16510 D Common Stock 2022-11-15 4 S 0 14631 27.07 D 1879 D Common Stock 2022-11-15 4 S 0 1445 27.69 D 434 D Employee Stock Option (Right-to-Buy) 9.48 2022-11-15 4 M 0 6250 0.00 D 2020-02-15 2029-02-15 Common Stock 6250 6250 D The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 1, 2022. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $26.64 to $27.64.The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission (the "SEC"), Amkor Technology, Inc. (the "Issuer"), or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $27.65 to $27.78.The Reporting Person hereby undertakes to provide, upon request, to the staff of the SEC, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (3) to this Form 4. This stock option ("the Option") to acquire 100,000 shares of the Issuers common stock (the "Option Shares") was granted on February 15, 2019 (the "Grant Date") and vests over four years as follows: (i) with respect to 25% of the Option Shares, on the first anniversary of the Grant Date; and (ii) with respect to the remainder of the Option Shares, in equal quarterly installments thereafter, such that 100% of the Option will vest on the fourth anniversary of the Grant Date. Mark N. Rogers, Attorney-in-Fact for Farshad Haghighi 2022-11-17