ENTEGRIS INC — Director's Dealing 2015

May 21, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ENTEGRIS INC (ENTG)
CIK: 0001101302
Period of Report: 2015-05-20

Reporting Person: Rucci Corey (V.P. Business Development)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-20	Common Stock	M	9320	$8.76	Acquired	34157.192	Direct
2015-05-20	Common Stock	F	6863	$13.75	Disposed	27294.192	Direct
2015-05-20	Common Stock	M	8302	$9.27	Acquired	35596.192	Direct
2015-05-20	Common Stock	F	6337	$13.75	Disposed	29259.192	Direct
2015-05-20	Common Stock	M	7900	$9.88	Acquired	37159.192	Direct
2015-05-20	Common Stock	F	6285	$13.75	Disposed	30874.192	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-20	Employee Stock Option (Right to Buy)	$8.76	M	9320	Disposed	2018-02-19	Common Stock (9320)	Direct
2015-05-20	Employee Stock Option (Right to Buy)	$9.27	M	8302	Disposed	2019-02-19	Common Stock (8302)	Direct
2015-05-20	Employee Stock Option (Right to Buy)	$9.88	M	7900	Disposed	2020-02-19	Common Stock (7900)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	50000	Indirect

Footnotes

F1: This option is fully vested.

F2: This option was granted pursuant to an employee stock option plan that provides for the grant of options in consideration of services as an employee.

F3: This option vests in four equal annual installments. The first three installments became exercisable on February 19, 2013, February 19, 2014 and February 19, 2015, respectively. The final installment becomes exercisable on February 19, 2016.

F4: This option vests in four equal annual installments. The first two installments became exercisable on February 19, 2014 and February 19, 2015, respectively. The final two installments become exercisable on February 19, 2016 and February 19, 2017, respectively.