ENTEGRIS INC — Director's Dealing 2011

Feb 3, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ENTEGRIS INC (ENTG)
CIK: 0001101302
Period of Report: 2011-02-01

Reporting Person: Morris Gregory Colburn (Vice President, GM, Field Ops)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-02-01	Common Stock	M	14746	$7.07	Acquired	71433	Direct
2011-02-01	Common Stock	S	14746	$8.25	Disposed	56687	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-02-01	Common Stock	$7.07	M	14746	Disposed	2015-02-21	Common Stock (14746)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	16822	Indirect

Footnotes

F1: These shares were sold pursuant to a Rule 10b5-1 Trading Plan established by the Reporting Person on May 18, 2010.

F2: This option is exercisable in three equal annual installments. The first installment became exercisable on 2/21/2009, the second installment became exercisable on 2/21/2010 and the last installment becomes exercisable on 2/21/2011.

F3: 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.