X0306 4 2018-03-02 0001097864 ON SEMICONDUCTOR CORP ON 0001363806 Schromm William A. 5005 EAST MCDOWELL ROAD PHOENIX AZ 85008 1 EVP & Chief Operating Officer Common 2018-03-02 4 F 0 4093.0000 24.4300 D 608356.0000 D Common 2018-03-02 4 F 0 4174.0000 24.4300 D 604182.0000 D This disposition transaction represents shares withheld by the Issuer in connection with the Reporting Person's 2015 performance-based restricted stock units award granted pursuant to the Issuer's Amended and Restated Stock Incentive Plan and related award agreement. On March 2, 2018, certain of these units vested. These shares were withheld to satisfy the Reporting Person's tax withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person. This disposition transaction represents shares withheld by the Issuer in connection with the Reporting Person's 2015 restricted stock units award granted pursuant to the Issuer's Amended and Restated Stock Incentive Plan and related award agreement. On March 2, 2018, certain of these units vested. These shares were withheld to satisfy the Reporting Person's tax withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person. George H. Cave, as Attorney-in-Fact 2018-03-06