LIMITED POWER OF ATTORNEY FOR

WEST PHARMACEUTICAL SERVICES, INC.

SECTION 16(a) FILINGS

Know all by these presents that the undersigned hereby constitutes and
appoints each of Luis Cantarero, Louis Lalli, Ryan Metz, Hallie Snyder Sacchetta
and Caitlin Hippeli, signing singly, the undersigned?s true and lawful
attorney-in-fact to:

(1) Execute for and on behalf of the undersigned, in the undersigned?s
capacity as an officer, director and/or shareholder of West Pharmaceutical
Services, Inc. (the ?Company?), Forms 3, 4, and 5 and amendments thereto
in accordance with Section 16(a) of the Securities Exchange Act of 1934 and
the rules thereunder;

(2) Do and perform any and all acts for and on behalf of the undersigned which
may be necessary or desirable to complete and execute any such Form 3, 4, or 5
or amendment thereto and timely file such form with the United States
Securities and Exchange Commission (the ?SEC?) and any stock exchange or
similar authority; and

(3)Take any other action of any type whatsoever, which, in the opinion of such
attorney-in-fact, may be necessary or desirable in connection with the
foregoing authority, it being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to this Power of
Attorney shall be in such form and shall contain such terms and conditions
as such attorney-in-fact may approve.

The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and
powers herein granted, as fully to all intents and purposes as the undersigned
might or could do if personally present, with full power of substitution or
revocation, hereby ratifying and confirming all that such attorney-in-fact,
or such attorney-in-fact?s substitute or substitutes, shall lawfully do or
cause to be done by virtue of this Power of Attorney and the rights and powers
herein granted.

The undersigned acknowledges that the foregoing attorneys-in-fact, in serving
in such capacity at the request of the undersigned, are not assuming, nor is
the Company assuming, any of the undersigned?s responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934.

This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect to
the undersigned?s holdings of and transaction in securities of the Company,
unless earlier revoked by the undersigned in a signed writing delivered to
the foregoing attorneys-in-fact.  This Power of Attorney may be filed with
the SEC as a confirming statement of the authority granted herein.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 4th day of August 2025.


SIGNATURE

/s/ Robert W. McMahon