X0306 4 2018-10-03 0001097864 ON SEMICONDUCTOR CORP ON 0001741144 HOPKIN VINCE CRAIG 5005 EAST MCDOWELL ROAD PHOENIX AZ 85008 1 EVP & GM, ASG Common 2018-10-03 4 F 0 1326.0000 18.4600 D 83069.0000 D This disposition transaction represents shares withheld by the Issuer in connection with the Reporting Person's 2016 restricted stock units award granted pursuant to the Issuer's Amended and Restated Stock Incentive Plan and related award agreement to satisfy the Reporting Person's tax withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person. Includes an aggregate of 281 shares acquired by the Reporting Person under the Issuer's Employee Stock Purchase Plan for the fiscal quarter ended September 28, 2018. Mark N. Rogers, Attorney-in-Fact 2018-10-05