X0306 4 2014-11-26 0001102934 CABOT MICROELECTRONICS CORP CCMP 0001436878 Damashek Yumiko C/O CABOT MICROELECTRONICS CORPORATION 870 COMMONS DRIVE AURORA IL 60504 1 VP, Japan and Operations Asia Common Stock 2014-11-26 4 M 0 13934 16.00 A 35776.209 D Common Stock 2014-11-26 4 S 0 13934 47.7258 D 21842.209 D Common Stock 2014-11-28 4 M 0 5660 16.00 A 27502.209 D Common Stock 2014-11-28 4 S 0 5660 47.8091 D 21842.209 D Stock Options (Right to Buy) 16.00 2014-11-26 4 M 0 13934 0 D 2009-12-01 2018-12-01 Common Stock 13934 8548 D Stock Options (Right to Buy) 16.00 2014-11-28 4 M 0 5660 0 D 2009-12-01 2018-12-01 Common Stock 5660 2888 D Sale to cover exercise price of, and taxes related to, exercise of stock options. 2008 Stock Option Grant Award Vesting Schedule: 25% 12/1/2009, 25% 12/1/2010, 25% 12/1/2011, 25% 12/1/2012 /s/ H. Carol Bernstein (Power of Attorney) 2014-12-01