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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	Explanation
Common Stock	Disposition	2012-02-22	5,820	$9.14	66,038	No	4	S	Direct
Common Stock	Disposition	2012-02-22	1,420	$9.14	64,618	No	4	S	Direct

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

Footnotes

Theses shares were sold pursuant to a 10b5-1 Trading Plan established by the Reporting Person on November 23, 2010.
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 Secretaries & Corporate Governance Professionals dated June 25, 2008. These shares were sold in multiple transactions at prices ranging from $9.0400 to $9.2700, 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.