X0306 4 2021-08-04 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001730724 McCourt MaryFrances 2045 EAST INNOVATION CIRCLE TEMPE AZ 85284 1 0 0 0 Common Stock 2021-08-04 4 S 0 2500 26.95 D 41092 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.89 to $27.05. The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, 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 (1) to this Form 4. Mark N. Rogers, Attorney-in-Fact for MaryFrances McCourt 2021-08-05