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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
1343148	J John Murphy	129 Concord Road Billerica MA 01821	Sr. Vice President -Hr	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	Acquisiton	2012-01-18	15,000	$1.13	111,930	No	4	M	Direct
Common Stock	Disposition	2012-01-18	15,000	$9.13	96,930	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
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	2012-01-18	15,000	$0.00	15,000	$1.13

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
25,000		2016-02-19	No	4	M	Direct

Footnotes

These shares were sold pursuant to a Rule 10b5-1 Trading Plan establishd by the Reporting Person on November 15, 2011.
These options are part of a grant that vests in three equal annaul installments. The first annual installment became exercisable on February 19, 2010, the second annual installment became exercisable on February 19, 2011 and the third annual installment becomes exercisable on February 19, 2012.
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.