X0306 4 2016-03-03 0001102934 CABOT MICROELECTRONICS CORP CCMP 0001201094 NOGLOWS WILLIAM P C/O CABOT MICROELECTRONICS CORPORATION 870 COMMONS DRIVE AURORA IL 60504 1 Common Stock 2016-03-03 4 I 0 56924 0 D 28652.291 D Common Stock 2016-03-03 4 I 0 56924 0 A 115873 I Trust Common Stock 2017-05-12 4 S 0 30000 76.5573 D 85873 I Trust Common Stock 2017-05-12 4 I 0 2252 0 D 30004.291 D Common Stock 2017-05-12 4 I 0 2252 0 A 88125 I Trust Common Stock 2017-05-15 4 S 0 30000 77.3689 D 58125 I Trust Transfer of shares from Mr. Noglows to trust for the benefit of Mrs. M. Noglows, Mr. Noglows' spouse, as to which Mr. Noglows has no investment or voting control. Represents shares 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) 2017-05-16