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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1102934	Cabot Microelectronics Corp	CCMP	Semiconductors & Related Devices (3674)	364324765

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1509949	Ananth Naman	C/O Cabot Microelectronics Corporation 870 Commons Drive Aurora IL 60504	Vp, Research & Development	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Disposition	2011-02-07	1,442	$46.76	3,163	No	4	S	Direct
Common Stock	Acquisiton	2011-02-07	450	$31.57	3,613	No	4	M	Direct
Common Stock	Disposition	2011-02-07	450	$46.76	3,163	No	4	S	Direct
Common Stock	Acquisiton	2011-02-07	375	$37.40	3,538	No	4	M	Direct
Common Stock	Disposition	2011-02-07	375	$46.76	3,163	No	4	S	Direct
Common Stock	Acquisiton	2011-02-07	625	$32.09	3,788	No	4	M	Direct
Common Stock	Disposition	2011-02-07	625	$46.76	3,163	No	4	S	Direct
Common Stock	Acquisiton	2011-02-07	755	$23.21	3,918	No	4	M	Direct
Common Stock	Disposition	2011-02-07	755	$46.76	3,163	No	4	S	Direct
Common Stock	Acquisiton	2011-02-07	1,162	$31.11	4,325	No	4	M	Direct
Common Stock	Disposition	2011-02-07	1,162	$46.76	3,163	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Options (Right to Buy)	Disposition	2011-02-07	450	$0.00	450	$31.57
Common Stock	Stock Options (Right to Buy)	Disposition	2011-02-07	375	$0.00	375	$37.40
Common Stock	Stock Options (Right to Buy)	Disposition	2011-02-07	625	$0.00	625	$32.09
Common Stock	Stock Options (Right to Buy)	Disposition	2011-02-07	755	$0.00	755	$23.21
Common Stock	Stock Options (Right to Buy)	Disposition	2011-02-07	1,162	$0.00	1,162	$31.11

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2007-12-01	2016-12-01	No	4	M	Direct
375	2008-11-30	2017-11-30	No	4	M	Direct
625	2009-01-21	2018-01-21	No	4	M	Direct
1,510	2009-12-01	2018-12-01	No	4	M	Direct
3,488	2010-12-01	2019-12-01	No	4	M	Direct

Footnotes

With original vesting schedule of 25% quarterly per year beginning on the first anniversary of grant date 12/1/2006.
With original vesting schedule of 25% quarterly per year beginning on the first anniversary of grant date 11/30/2007.
With original vesting schedule of 25% quarterly per year beginning on the first anniversary of grant date 1/21/2008.
With original vesting schedule of 25% quarterly per year beginning on the first anniversary of grant date 12/1/2008.
With original vesting schedule of 25% quarterly per year beginning on the first anniversary of grant date 12/1/2009.