X0306 4 2016-10-31 0001102934 CABOT MICROELECTRONICS CORP CCMP 0001411830 Xia Bailing C/O CABOT MICROELECTRONICS CORPORATION 870 COMMONS DRIVE AURORA IL 60504 1 Common Stock 2016-10-31 4 M 0 8704 22.60 A 26351 D Common Stock 2016-10-31 4 S 0 8704 54.7028 D 17647 D Common Stock 2016-10-31 4 M 0 8704 13.11 A 26351 D Common Stock 2016-10-31 4 S 0 8704 54.7028 D 17647 D Common Stock 2016-10-31 4 M 0 8704 24.97 A 26351 D Common Stock 2016-10-31 4 S 0 8704 54.7028 D 17647 D Common Stock 2016-10-31 4 M 0 8704 33.90 A 26351 D Common Stock 2016-10-31 4 S 0 8704 54.7028 D 17647 D Common Stock 2016-10-31 4 M 0 6000 33.89 A 23647 D Common Stock 2016-10-31 4 S 0 6000 54.7028 D 17647 D Common Stock 2016-10-31 4 M 0 6000 35.47 A 23647 D Common Stock 2016-10-31 4 S 0 6000 54.7028 D 17647 D Common Stock 2016-10-31 4 M 0 6000 44.88 A 23647 D Common Stock 2016-10-31 4 S 0 6000 54.7028 D 17647 D Common Stock 2016-10-31 4 M 0 5184 51.57 A 22831 D Common Stock 2016-10-31 4 S 0 5184 54.7028 D 17647 D Common Stock 2016-10-31 4 S 0 14006 54.9753 D 3641 D Stock Options (Right to Buy) 22.60 2016-10-31 4 M 0 8704 0 D 2009-03-04 2018-03-04 Common Stock 8704 0 D Stock Options (Right to Buy) 13.11 2016-10-31 4 M 0 8704 0 D 2010-03-03 2019-03-03 Common Stock 8704 0 D Stock Options (Right to Buy) 24.97 2016-10-31 4 M 0 8704 0 D 2011-03-02 2020-03-02 Common Stock 8704 0 D Stock Options (Right to Buy) 33.90 2016-10-31 4 M 0 8704 0 D 2012-03-08 2021-03-08 Common Stock 8704 0 D Stock Options (Right to Buy) 33.89 2016-10-31 4 M 0 6000 0 D 2013-03-06 2022-03-06 Common Stock 6000 0 D Stock Options (Right to Buy) 35.47 2016-10-31 4 M 0 6000 0 D 2014-03-05 2023-03-05 Common Stock 6000 0 D Stock Options (Right to Buy) 44.88 2016-10-31 4 M 0 6000 0 D 2015-03-04 2024-03-04 Common Stock 6000 0 D Stock Options (Right to Buy) 51.57 2016-10-31 4 M 0 5184 0 D 2016-03-03 2025-03-03 Common Stock 5184 816 D Directors' Annual (2008) Non-Qualified Stock Option Award Vesting Schedule: 25% 3/4/2009, 25% 3/4/2010, 25% 3/4/2011, 25% 3/4/2012. Directors' Annual (2009) Non-Qualified Stock Option Award Vesting Schedule: 25% 3/3/2010; 25% 3/3/2011; 25% 3/3/2012; 25% 3/3/2013. Directors' Annual (2010) Non-Qualified Stock Option Award Vesting Schedule: 25% 3/2/2011; 25% 3/2/2012; 25% 3/2/2013; 25% 3/2/2014. Directors' Annual (2011) Non-Qualified Stock Option Award: 100% vested on 3/8/2012. Directors' Annual (2012) Non-Qualified Stock Option Grant pursuant to 2012 Omnibus Incentive Plan ("OIP"). 100% vested on 3/6/2013. Directors' Annual (2013) Non-Qualified Stock Option Grant pursuant to 2012 Omnibus Incentive Plan ("OIP"); 100% vested on 3/5/2014. Directors' Annual (2014) Non-Qualified Stock Option Grant pursuant to 2012 Omnibus Incentive Plan ("OIP"); 100% vested on 3/4/2015. Directors' Annual (2015) Non-Qualified Stock Option Grant pursuant to 2012 Omnibus Incentive Plan ("OIP); 100% vested on 3/8/2016. /s/ H. Carol Bernstein (Power of Attorney) 2016-10-31