X0508 4 2025-02-06 0001097864 ON SEMICONDUCTOR CORP ON 0001722291 GOPALSWAMY SUDHIR 5701 NORTH PIMA ROAD SCOTTSDALE AZ 85250 1 Group President, AMG & ISG 0 Common 2025-02-06 4 A 0 28329.0000 0.0000 A 123191.0000 D Common 2025-02-06 4 A 0 5463.0000 0.0000 A 128654.0000 D Common 2025-02-06 4 A 0 2477.0000 0.0000 A 131131.0000 D Common 2025-02-06 4 A 0 803.0000 0.0000 A 131934.0000 D Common 2025-02-07 4 F 0 6373.0000 51.2500 D 125561.0000 D Represents the subset of an award of performance-based restricted stock units, originally granted to the Reporting Person on February 21, 2024, that were earned based on the Issuer's performance as measured against the underlying metrics. These units will vest in three annual installments beginning on February 11, 2025, subject to the Reporting Person's continued employment through the applicable vesting date. Represents the subset of an award of performance-based restricted stock units, originally granted to the Reporting Person on March 7, 2022, that (a) were earned based on the Issuer's performance as measured against the underlying metrics and (b) will vest on February 7, 2025. Represents the subset of an award of performance-based restricted stock units, originally granted to the Reporting Person on February 20, 2023, that (a) were earned based on the Issuer's performance as measured against the underlying metrics and (b) will vest on February 7, 2025. Represents the subset of an award of performance-based restricted stock units, originally granted to the Reporting Person on May 26, 2023, that (a) were earned based on the Issuer's performance as measured against the underlying metrics and (b) will vest on February 7, 2025. Represents shares withheld to cover taxes due upon the vesting of performance-based restricted stock units. Includes an additional 88 shares that were acquired by the Reporting Person under the Issuer's Employee Stock Purchase Plan since his last Section 16 filing. /s/ Hope M. Spencer, Attorney-in-Fact 2025-02-10