X0306 4 2021-11-17 0001102934 CMC Materials, Inc. CCMP 0001764053 Dysard Jeffrey Michael C/O CMC MATERIALS, INC. 870 N. COMMONS DRIVE AURORA IL 60504 1 VP and Pres. of Perf. Material Common Stock 2021-11-17 4 A 0 1492 0 A 10002.6426 D Common Stock 2021-11-17 4 F 0 412 145.45 D 9590.6426 D Represents settlement of performance share units ("PSUs") in shares of common stock for the three-year performance period beginning October 1, 2018 and ending September 30, 2021, granted under the CMC Materials, Inc. 2012 Omnibus Incentive Plan, which are exempt from liability under Section 16(b) of the Securities Exchange Act pursuant to Rule 16b-3(d). Withheld to cover for tax purposes as per terms of Omnibus Incentive Plan. /s/ H. Carol Bernstein (Power of Attorney) 2021-11-17