X0609 4 2026-09-22 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0001405591 Tily Gil C. false 2045 EAST INNOVATION CIRCLE TEMPE AZ 85284 1 0 0 0 0 Restricted Stock Units 2026-09-22 4 A 0 3.9978 0 A Common Stock 3.9978 2619.5144 D Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on September 22, 2026 with respect to time-vested restricted stock units ("RSUs") of Amkor Technology, Inc. (the "Issuer") granted to the Reporting Person on May 13, 2026. Each DEU represents an additional RSU subject to the same provisions as the RSU with respect to which the DEU was accrued. /s/ Mark N. Rogers, Attorney-in-Fact for Gil C. Tily 2026-09-24