Sec Form 3 Filing - Poussot Rodolphe Jean @ WEST PHARMACEUTICAL SERVICES INC - 2025-07-23

FORM 3 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 Poussot Rodolphe Jean 2. Issuer Name and Ticker or Trading Symbol WEST PHARMACEUTICAL SERVICES INC [ WST] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) SVP, Strategy & Corporate Dev (Last) (First) (Middle) 530 HERMAN O. WEST DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 07/23/2025 (Street) EXTON, PA19341 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 252.908 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 Rst. Stock Unit $ 0 ( 1 ) ( 1 ) Common Stock 764.7 D Rst. Stock Unit $ 0 ( 2 ) ( 2 ) Common Stock 329.32 D Stock Option (Right to Buy) $ 350.18 02/20/2025( 3 ) 02/20/2034 Common Stock 1,577 D Stock Option (Right to Buy) $ 211 02/18/2026( 2 ) 02/18/2035 Common Stock 760 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Poussot Rodolphe Jean 530 HERMAN O. WEST DRIVE EXTON, PA19341 SVP, Strategy & Corporate Dev Signatures /s/ Louis Lalli, as an agent for Rodolphe Poussot 08/01/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This award vests in three equal installments beginning on February 20, 2025. ( 2 )This award vests in four equal installments beginning on February 18, 2026. ( 3 )This award vests in four equal installments beginning on February 20, 2025.

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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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