West Pharmaceutical Services (WST)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-04-27 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: WEST PHARMACEUTICAL SERVICES INC (WST) CIK: 0000105770 --- Reporting Owner --- Name: Favorite Annette F CIK: 0001654975 Role: Officer (Sr. VP & Chief HR Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-04-27 | Code: M (Exercise of derivative) Shares: +2,817 | Price: $83.47 Total Value: $235,134.99 Shares Owned After: 19,645.4906 | Ownership: D (Direct) [Transaction #2] Security: Common Stock Date: 2026-04-27 | Code: S (Open market sale) Shares: -2,817 | Price: $305.20 Total Value: $859,753.47 Shares Owned After: 16,828.4906 | Ownership: D (Direct) Footnotes: [F1] The price reported in Column 4 is a weighted average price. --- Derivative Transactions --- [Transaction #1] Security: Stock Options (Right to Buy) Date: 2026-04-27 | Code: M (Exercise of derivative) Shares: -2,817 | Price: $0.00 Exercisable: N/A | Expires: 2027-02-21 Shares Owned After: 5,635 | Ownership: D (Direct) Footnotes: [F2] This award granted on February 21, 2017 vested in four equal annual installments beginning on February 21, 2018. --- Holdings --- [Holding #1] Security: Common Stock Ownership: I (Indirect) --- Footnotes (Complete Index) --- F1: The price reported in Column 4 is a weighted average price. F2: This award granted on February 21, 2017 vested in four equal annual installments beginning on February 21, 2018. --- Signature --- /s/ /s/ Louis Lalli, as an agent for Annette Favorite (2026-04-29)