Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
LOY BERTRAND
   2. Issuer Name and Ticker or Trading Symbol
ENTEGRIS INC [ENTG] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Executive V.P. & CAO
(Last)
(First)
(Middle)
2 SETTLEMENT WAY		 3. Date of Earliest Transaction (Month/Day/Year)
08/06/2005
(Street)

ACTON, MA 01720		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 08/06/2005   A   49,299 A (1) 49,299 D  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right to buy) $ 11.12 08/06/2005   A   76,450     (2) 12/04/2010 Common Stock 76,450 (3) 76,450 D  
Employee Stock Option (right to buy) $ 4.89 08/06/2005   A   52,560     (4) 12/18/2009 Common Stock 52,560 (5) 52,560 D  
Employee Stock Option (right to buy) $ 6.1 08/06/2005   A   18,879     (7) 12/07/2010 Common Stock 18,879 (6) 18,879 D  
Employee Stock Option (right to buy) $ 8.35 08/06/2005   A   30,406     (8) 11/29/2008 Common Stock 30,406 (9) 30,406 D  
Employee Stock Option (right to buy) $ 10.79 08/06/2005   A   59     (7) 08/10/2007 Common Stock 59 (11) 59 D  
Employee Stock Option (right to buy) $ 10.79 08/06/2005   A   30,406     (7) 08/10/2008 Common Stock 30,406 (10) 30,406 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
LOY BERTRAND
2 SETTLEMENT WAY
ACTON, MA 01720		       Executive V.P. & CAO  

Signatures

 /s/ Bertrand Loy   08/08/2005
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Received in exchange for 35,467 shares of Mykrolis Corporation common stock in connection with the merger of Mykrolis Corporation into Eagle DE, Inc. pursuant to Agreement and Plan of Merger, dated March 21, 2005 (the "Merger"); pursuant to the Merger Eagle DE, Inc. changed its name to Entegris, Inc.
(2) These options vest 25% on 12/4/2004 and quarterly therafter in 12 equal increments.
(3) Received in exchange for 55,000 shares of Mykrolis Corporation common stock in connection with the merger of Mykrolis Corporation into Eagle DE, Inc. pursuant to Agreement and Plan of Merger, dated March 21, 2005 (the "Merger"); pursuant to the Merger Eagle DE, Inc. changed its name to Entegris, Inc.
(4) These options vest 25% on 12/18/2003 and quarterly therafter in 12 equal increments.
(5) Received in the Merger in exchange for an employee stock option to acquire 37,813 shares of Mykrolis Corporation at a price of $6.80 per share.
(6) Received in the Merger in exchange for an employee stock option to acquire 13,578 shares of Mykrolis Corporation at a price of $8.48 per share.
(7) These options are fully vested.
(8) These options vest 25% on 11/29/2002 and quarterly therafter in 12 equal increments.
(9) Received in the Merger in exchange for an employee stock option to acquire 21,875 shares of Mykrolis Corporation at a price of $11.60 per share.
(10) Received in the Merger in exchange for an employee stock option to acquire 21,875 shares of Mykrolis Corporation at a price of $15.00 per share.
(11) Received in the Merger in exchange for an employee stock option to acquire 43 shares of Mykrolis Corporation at a price of $15.00 per share.

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