X0306 4 2018-02-14 0001102934 CABOT MICROELECTRONICS CORP CCMP 0001201094 NOGLOWS WILLIAM P C/O CABOT MICROELECTRONICS CORPORATION 870 COMMONS DRIVE AURORA IL 60504 1 Common Stock 2018-02-14 4 S 0 17000 98.855 D 41125 I Trust Represents shares that were held in trust for the benefit of Mrs. M. Noglows, Mr. Noglows' spouse, as to which Mr. Noglows has no investment or voting control. Accordingly, he is not deemed the beneficial owner of such shares for Section 16 purposes but wishes to continue to report these shares on a voluntary basis. /s/ H. Carol Bernstein (Power of Attorney) 2018-02-14