Sec Form 4 Filing - Besnard Michael @ ENTEGRIS INC - 2023-01-31

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 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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1. Name and Address of Reporting Person Besnard Michael 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) SVP, Chief Commercial Officer (Last) (First) (Middle) C/O ENTEGRIS, INC., 129 CONCORD ROAD 3. Date of Earliest Transaction (MM/DD/YY) 01/31/2023 (Street) BILLERICA, MA01821 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 01/31/2023 A 2,600( 1 ) A $ 0( 2 ) 10,651.208 D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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) $ 80.71 01/31/2023 A 4,656 ( 3 ) 02/19/2030 Common Stock 4,656 $ 0( 2 ) 4,656 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Besnard Michael C/O ENTEGRIS, INC. 129 CONCORD ROAD BILLERICA, MA01821 SVP, Chief Commercial Officer Signatures /s/ Joseph Colella, Attorney-In-Fact for Michael Besnard 02/02/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )These shares are restricted stock units with restrictions that lapse over a four-year period with respect to 25% of these shares per year beginning February 19, 2024 and thereafter on February 19, 2025, February 19, 2026 and February 19, 2027. ( 2 )Awarded pursuant to the Entegris, Inc. 2020 Stock Plan in consideration of services as an employee. ( 3 )The option vests in four equal annual installments beginning on February 19, 2024 and thereafter on February 19, 2025, February 19, 2026 and February 19, 2027.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* 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).

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