West Pharmaceutical Services (WST)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-08 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: 2026-09-08 | Code: M (Exercise of derivative) Shares: +2,817 | Price: $83.47 Total Value: $235,134.99 Shares Owned After: 19,661.5548 | Ownership: D (Direct) [Transaction #2] Security: Common Stock Date: 2026-09-08 | Code: S (Open market sale) Shares: -2,817 | Price: $340.81 Total Value: $960,061.77 Shares Owned After: 16,844.5548 | Ownership: D (Direct) Footnotes: [F1] The price reported in Column 4 is a weighted average price. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price resulting in such weighted average price. [Transaction #3] Security: Common Stock Date: 2026-09-08 | Code: M (Exercise of derivative) Shares: +2,818 | Price: $83.47 Total Value: $235,218.46 Shares Owned After: 19,662.5548 | Ownership: D (Direct) [Transaction #4] Security: Common Stock Date: 2026-09-08 | Code: S (Open market sale) Shares: -2,818 | Price: $340.81 Total Value: $960,402.58 Shares Owned After: 16,844.5548 | Ownership: D (Direct) Footnotes: [F1] The price reported in Column 4 is a weighted average price. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price resulting in such weighted average price. [Transaction #5] Security: Common Stock Date: 2026-09-08 | Code: M (Exercise of derivative) Shares: +2,500 | Price: $89.64 Total Value: $224,100.00 Shares Owned After: 19,344.5548 | Ownership: D (Direct) [Transaction #6] Security: Common Stock Date: 2026-09-08 | Code: S (Open market sale) Shares: -2,500 | Price: $340.81 Total Value: $852,025.00 Shares Owned After: 16,844.5548 | Ownership: D (Direct) Footnotes: [F1] The price reported in Column 4 is a weighted average price. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price resulting in such weighted average price. --- Derivative Transactions --- [Transaction #1] Security: Stock Options (Right to Buy) Date: 2026-09-08 | Code: M (Exercise of derivative) Shares: -2,817 | Price: $0.00 Exercise Price: $83.47 Exercisable: N/A | Expires: 2027-02-21 Shares Owned After: 2,818 | Ownership: D (Direct) Footnotes: [F2] This award granted on February 21, 2017 vested in four equal annual installments beginning on February 21, 2018. [Transaction #2] Security: Stock Options (Right to Buy) Date: 2026-09-08 | Code: M (Exercise of derivative) Shares: -2,818 | Price: $0.00 Exercise Price: $83.47 Exercisable: N/A | Expires: 2027-02-21 Shares Owned After: 0 | Ownership: D (Direct) Footnotes: [F2] This award granted on February 21, 2017 vested in four equal annual installments beginning on February 21, 2018. [Transaction #3] Security: Stock Option (Right to Buy) Date: 2026-09-08 | 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: 7,524 | Ownership: D (Direct) Footnotes: [F3] This award granted on February 20, 2018 vested in four equal annual installments beginning on February 20, 2019. --- Footnotes (Complete Index) --- F1: The price reported in Column 4 is a weighted average price. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price resulting in such weighted average price. F2: This award granted on February 21, 2017 vested in four equal annual installments beginning on February 21, 2018. F3: 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 (2026-09-10)