X0508 4 2024-02-21 0001097864 ON SEMICONDUCTOR CORP ON 0001558882 El-Khoury Hassane 5701 NORTH PIMA ROAD SCOTTSDALE AZ 85250 1 1 CEO & President 0 Common 2024-02-21 4 A 0 107898.0000 0.0000 A 767291.0000 D Common 2024-02-21 4 A 0 86318.0000 0.0000 A 853609.0000 D Common 2024-02-21 4 F 0 11649.0000 77.6200 D 841960.0000 D Represents restricted stock units that will vest in three annual installments beginning on the third anniversary of the grant date, subject to the Reporting Person's continued employment through the applicable vesting date, with the potential to earn additional shares on each vesting date if applicable performance criteria are met. Represents time-based restricted stock units that will vest in three equal annual installments beginning on the first anniversary of the grant date, subject to the Reporting Person's continued employment through the applicable vesting date. Represents shares withheld to cover taxes due upon the vesting of restricted stock units. /s/ Hope M. Spencer, Attorney-in-Fact 2024-02-22