X0306 4 2021-12-03 0001102934 CMC Materials, Inc. CCMP 0001628944 Press Jeanette A. C/O CMC MATERIALS, INC. 870 N. COMMONS DR. AURORA IL 60504 1 Interim CFO & Corp Controller Common Stock 2021-12-03 4 F 0 35 136.65 D 1441 D Common Stock 2021-12-06 4 A 0 795 0 A 2236 D Stock Options (Right to Buy) 141.18 2021-12-06 4 A 0 2216 0 A 2022-12-06 2031-12-06 Common Stock 2216 2216 D Withheld to cover for tax purposes as per terms of Omnibus Incentive Plan. 2021 (FY22) Restricted Stock Unit Award Vesting Schedule: 25% 12/06/2022, 25% 12/06/2023, 25% 12/06/2024, 25% 12/06/2025. 2021 (FY22) Non-Qualified Stock Option Grant Vesting Schedule: 25% 12/06/2022, 25% 12/06/2023, 25% 12/06/2024, 25% 12/06/2025. /s/ H. Carol Bernstein (Power of Attorney) 2021-12-07