West Pharmaceutical Services (WST)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-11 10b5-1 Pre-arranged Plan: Yes --- 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: 2026-09-11 | Code: M (Exercise of derivative) Shares: +2,500 | Price: $89.64 Total Value: $224,100.00 Shares Owned After: 24,317.8098 | Ownership: D (Direct) [Transaction #2] Security: Common Stock Date: 2026-09-11 | Code: S (Open market sale) Shares: -2,500 | Price: $345.00 Total Value: $862,500.00 Shares Owned After: 21,817.8098 | Ownership: D (Direct) [Transaction #3] Security: Common Stock Date: 2026-09-14 | Code: M (Exercise of derivative) Shares: +2,500 | Price: $89.64 Total Value: $224,100.00 Shares Owned After: 24,317.8098 | Ownership: D (Direct) [Transaction #4] Security: Common Stock Date: 2026-09-14 | Code: S (Open market sale) Shares: -2,500 | Price: $355.00 Total Value: $887,500.00 Shares Owned After: 21,817.8098 | Ownership: D (Direct) [Transaction #5] Security: Common Stock Date: 2026-09-15 | Code: M (Exercise of derivative) Shares: +2,524 | Price: $89.64 Total Value: $226,251.36 Shares Owned After: 24,341.8098 | Ownership: D (Direct) [Transaction #6] Security: Common Stock Date: 2026-09-15 | Code: S (Open market sale) Shares: -2,524 | Price: $365.00 Total Value: $921,260.00 Shares Owned After: 21,817.8098 | Ownership: D (Direct) --- Derivative Transactions --- [Transaction #1] Security: Stock Option (Right to Buy) Date: 2026-09-11 | Code: M (Exercise of derivative) Shares: -2,500 | Price: $0.00 Exercise Price: $89.64 Exercisable: N/A | Expires: 2028-02-20 Shares Owned After: 5,024 | Ownership: D (Direct) Footnotes: [F1] This award granted on February 20, 2018 vested in four equal annual installments beginning on February 20, 2019. [Transaction #2] Security: Stock Option (Right to Buy) Date: 2026-09-14 | Code: M (Exercise of derivative) Shares: -2,500 | Price: $0.00 Exercise Price: $89.64 Exercisable: N/A | Expires: 2028-02-20 Shares Owned After: 2,524 | Ownership: D (Direct) Footnotes: [F1] This award granted on February 20, 2018 vested in four equal annual installments beginning on February 20, 2019. [Transaction #3] Security: Stock Option (Right to Buy) Date: 2026-09-15 | Code: M (Exercise of derivative) Shares: -2,524 | Price: $0.00 Exercise Price: $89.64 Exercisable: N/A | Expires: 2028-02-20 Shares Owned After: 0 | Ownership: D (Direct) Footnotes: [F1] This award granted on February 20, 2018 vested in four equal annual installments beginning on February 20, 2019. --- Footnotes (Complete Index) --- F1: This award granted on February 20, 2018 vested in four equal annual installments beginning on February 20, 2019. --- Signature --- /s/ /s/ Louis Lalli, as an agent for Annette Favorite (2026-09-15)