X0306 4 2018-08-01 0001097864 ON SEMICONDUCTOR CORP ON 0001558921 GUTMANN BERNARD 5005 EAST MCDOWELL ROAD PHOENIX AZ 85008 1 Exec VP & CFO Common 2018-08-01 4 A 0 117956.0000 0.0000 A 663463.0000 D Common 2018-08-01 4 F 0 27219.0000 22.2600 D 636244.0000 D This Form 4 reports the acquisition on August 1, 2018 of 117,956 Performance Based Restricted Stock Units (the "PBRSUs") from the attainment of performance goals under an award made to the Reporting Person on March 6, 2017 (the "PBRSU Award"). The PBRSU Award covered a performance period of six consecutive fiscal quarters beginning with the quarter commencing January 1, 2017 (the "Performance Period"), and the number of shares eligible for vesting was based upon the Issuer achieving certain Adjusted Non-GAAP EBITDA performance goals for the Performance Period. The PBRSUs also include an additional equity award based on the Issuer's achievement of certain market share and free cash flow performance goals for the Performance Period. This disposition transaction reflects shares withheld by the Issuer in connection with the PBRSU Award to satisfy the Reporting Person's tax withholding obligations. The Issuer will pay these taxes on behalf of the Reporting Person. Mark N. Rogers, Attorney-in-Fact 2018-08-03