X0306 4 2018-12-06 0001102934 CABOT MICROELECTRONICS CORP CCMP 0001278556 ROMAN THOMAS S C/O CABOT MICROELECTRONICS CORPORATION 870 COMMONS DRIVE AURORA IL 60504 1 Corporate Controller Common Stock 2018-12-06 4 F 0 176 101.73 D 7952.53 D Common Stock 2018-12-06 4 F 0 52 101.73 D 7900.53 D Common Stock 2018-12-06 4 A 0 600 101.73 A 8500.53 D Stock Options (Right to Buy) 101.73 2018-12-06 4 A 0 2220 101.73 A 2019-12-06 2028-12-06 Common Stock 2220 2220 D Withheld to cover for tax purposes as per terms of Omnibus Incentive Plan. 2018 (FY19) Restricted Stock Unit Award Vesting Schedule: 25% 12/06/2019, 25% 12/06/2020, 25% 12/06/2021, 25% 12/06/2022. 2018 (FY19) Non-Qualified Stock Option Grant Vesting Schedule: 25% 12/06/2019, 25% 12/06/2020, 25% 12/06/2021, 25% 12/05/2022. /s/ H. Carol Bernstein (Power of Attorney) 2018-12-10