ENTEGRIS INC — Director's Dealing 2017

May 3, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ENTEGRIS INC (ENTG)
CIK: 0001101302
Period of Report: 2017-05-01

Reporting Person: Edlund Todd James (EVP & COO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-01	Common Stock	M	33932	$9.88	Acquired	160610	Direct
2017-05-01	Common Stock	M	24000	$11.71	Acquired	184610	Direct
2017-05-01	Common Stock	F	38816	$25.30	Disposed	145794	Direct
2017-05-02	Common Stock	S	19116	$25.0167	Disposed	126678	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-01	Employee Stock Option (Right to Buy)	$9.88	M	33932	Disposed	2020-02-19	Common Stock (33932)	Direct
2017-05-01	Employee Stock Option (Right to Buy)	$11.71	M	24000	Disposed	2021-02-19	Common Stock (24000)	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 $24.925 to $25.10147, 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: This option is fully vested.

F3: This option was granted pursuant to the Entegris, Inc. 2010 Stock Plan, as amended, in consideration of service as an employee.

F4: This option vests in four equal installments. The first three installments became exercisable on February 19, 2015, February 19, 2016 and February 19, 2017, respectively. The last installment becomes available on February 19, 2018.