ENTEGRIS INC — Director's Dealing 2012

Feb 23, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ENTEGRIS INC (ENTG)
CIK: 0001101302
Period of Report: 2012-02-21

Reporting Person: LOY BERTRAND (Exec VP & COO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-21	Common Stock	M	16966	$1.13	Acquired	200877	Direct
2012-02-21	Common Stock	S	16966	$9.4011	Disposed	183911	Direct
2012-02-22	Common Stock	M	7300	$5.40	Acquired	191211	Direct
2012-02-22	Common Stock	S	7300	$9.4163	Disposed	183911	Direct
2012-02-22	Common Stock	M	41367	$1.13	Acquired	225278	Direct
2012-02-22	Common Stock	S	41367	$9.3158	Disposed	183911	Direct
2012-02-22	Common Stock	S	12119	$9.1429	Disposed	171792	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-02-21	Employee Stock Option (Right to Buy)	$1.13	M	16966	Disposed	2016-02-19	Common Stock (16966)	Direct
2012-02-22	Employee Stock Option (Right to Buy)	$5.40	M	7300	Disposed	2017-02-19	Common Stock (7300)	Direct
2012-02-22	Employee Stock Option (Right to Buy)	$1.13	M	41367	Disposed	2016-02-19	Common Stock (41367)	Direct

Footnotes

F1: 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 $9.37 to $9.4894, 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.

F2: 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 $9.40 to $9.44, 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.

F3: 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 $9.3000 to $9.3450, 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.

F4: 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.

F5: This option is fully vested.

F6: 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.

F7: This option is exercisable in three equal annual installments. The first installment became exercisable on February 19, 2011, the second installment became exercisable on February 19, 2012 and the third installment will become exercisable on February 19, 2013.