X0306 4 2017-11-27 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001443674 Kelley Stephen Douglas 2045 EAST INNOVATION CIRCLE TEMPE AZ 85284 1 1 0 0 President and CEO Common Stock 2017-11-27 4 F 0 5750 11.39 D 190450 D Director Stock Option (Right to Buy) 4.50 2017-11-03 4 M 0 18164 0.00 D 2014-05-08 2023-05-08 Amkor Technology, Inc. Common Stock 18164 0 D Reflects the November 3, 2017 exercise of 18,164 employee stock options at the direction of Mr. Kelley's ex-spouse pursuant to the terms of a qualified domestic relations order. Mr. Kelley's ex-spouse will retain all proceeds from the sales. The option grant vests as follows: 25% of the shares vest on the first anniversary of the grant date, and 1/16th vest quarterly thereafter such that 100% of the option will be vested on the fourth anniversary of the grant date. Jerry C. Allison, Attorney-in-Fact for Stephen D. Kelley 2017-11-28