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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1101302	Entegris Inc	ENTG	Plastics Products, Nec (3089)	411941551

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1197453	W Peter Walcott	25 Lowell Road Wellesley MA 02481	Sr V.p. & General Counsel	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	Acquisiton	2012-11-27	35,000	$1.13	102,426	No	4	M	Direct
Common Stock	Disposition	2012-11-27	35,000	$8.77	67,426	No	4	S	Direct
Common Stock	Acquisiton	2012-11-27	41,405	$7.07	108,831	No	4	M	Direct
Common Stock	Disposition	2012-11-27	41,405	$8.77	67,426	No	4	S	Direct
Common Stock	Acquisiton	2012-11-27	19,494	$5.40	86,920	No	4	M	Direct
Common Stock	Disposition	2012-11-27	19,494	$8.77	67,426	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
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	Employee Stock Option (Right to Buy)	Disposition	2012-11-27	35,000	$0.00	35,000	$1.13
Common Stock	Employee Stock Option (Right to Buy)	Disposition	2012-11-27	41,405	$0.00	41,405	$7.07
Common Stock	Employee Stock Option (Right to Buy)	Disposition	2012-11-27	19,494	$0.00	19,494	$5.40

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2016-02-19	No	4	M	Direct
0	2015-02-21	No	4	M	Direct
19,495	2017-02-19	No	4	M	Direct

Footnotes

The price reported in column 4 is a weighted average price reported in reliance on a letter from the Office of Chief Counsel, Securities and Exchange Commission's Division of Corporate Finance to the Society of Corporate Securities & Corporate Governance Professionals dated June 25, 2008. These shares were sold in multiple transactions at prices ranging from $8.61 to $8.85, inclusive. The reporting person undertakes to provide Entegris, Inc. any shareholder of Entegris, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
These options are fully vested.
The option vests in three equal annaul installments on February 19, 2011, February 19, 2012 and February 19, 2013.
These options were granted pursuant to an employee stock option plan that provides for the grant of options in consideration of services as an employee.