X0609 4 2026-04-03 0001097864 ON SEMICONDUCTOR CORP ON 0001625756 MASCARENAS PAUL ANTHONY false 5701 NORTH PIMA ROAD SCOTTSDALE AZ 85250 1 0 Common 2026-04-03 4 A 0 168.0000 62.1900 A 55488.0000 D Represents fully-vested shares of common stock issued to the Reporting Person in lieu of a portion of his quarterly cash retainers for the first quarter of 2026 based on his previously-submitted election. /s/ Hope M. Spencer, Attorney-in-Fact 2026-04-06