X0609 4 2026-06-23 0 0001047127 AMKOR TECHNOLOGY, INC. AMKR 0000923792 CHURCHILL WINSTON J false 500 SE MIZNER BLVD. APT 305A BOCA RATON FL 33432-6083 1 0 0 0 0 Restricted Stock Units 2026-06-23 4 A 0 2.5166 0 A Common Stock 2.5166 2615.5166 D Represents dividend equivalent units ("DEUs") accrued upon the payment of a dividend on June 23, 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 Winston J. Churchill 2026-06-25