West Pharmaceutical Services (WST)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-12 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: WEST PHARMACEUTICAL SERVICES INC (WST) CIK: 0000105770 --- Reporting Owner --- Name: Campbell Shane Alden CIK: 0002068522 Role: Officer (SVP, Proprietary Segment) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-05-12 | Code: M (Exercise of derivative) Shares: +295.995 Shares Owned After: 358.4594 | Ownership: D (Direct) Footnotes: [F1] Restricted stock units convert into common stock on a one-for-one basis. [Transaction #2] Security: Common Stock Date: 2026-05-12 | Code: F (Payment of exercise/tax) Shares: -84.329 | Price: $312.07 Total Value: $26,316.55 Shares Owned After: 274.1304 | Ownership: D (Direct) [Transaction #3] Security: Common Stock Date: 2026-05-12 | Code: M (Exercise of derivative) Shares: +473.593 Shares Owned After: 747.7234 | Ownership: D (Direct) Footnotes: [F1] Restricted stock units convert into common stock on a one-for-one basis. [Transaction #4] Security: Common Stock Date: 2026-05-12 | Code: F (Payment of exercise/tax) Shares: -134.927 | Price: $312.07 Total Value: $42,106.67 Shares Owned After: 612.7964 | Ownership: D (Direct) --- Derivative Transactions --- [Transaction #1] Security: Rst. Stock Unit Date: 2026-05-12 | Code: M (Exercise of derivative) Shares: -295.995 | Price: $0.00 Shares Owned After: 886.005 | Ownership: D (Direct) Footnotes: [F1] Restricted stock units convert into common stock on a one-for-one basis. [F2] On May 12, 2025, the reporting person was granted 1,182 restricted stock units, vesting in four equal annual installments (plus dividend equivalents). [F2] On May 12, 2025, the reporting person was granted 1,182 restricted stock units, vesting in four equal annual installments (plus dividend equivalents). [Transaction #2] Security: Rst. Stock Unit Date: 2026-05-12 | Code: M (Exercise of derivative) Shares: -473.593 | Price: $0.00 Shares Owned After: 1,417.407 | Ownership: D (Direct) Footnotes: [F1] Restricted stock units convert into common stock on a one-for-one basis. [F3] On May 12, 2025, the reporting person was granted 1,891 restricted stock units, vesting in four equal annual installments (plus dividend equivalents). [F3] On May 12, 2025, the reporting person was granted 1,891 restricted stock units, vesting in four equal annual installments (plus dividend equivalents). --- Footnotes (Complete Index) --- F1: Restricted stock units convert into common stock on a one-for-one basis. F2: On May 12, 2025, the reporting person was granted 1,182 restricted stock units, vesting in four equal annual installments (plus dividend equivalents). F3: On May 12, 2025, the reporting person was granted 1,891 restricted stock units, vesting in four equal annual installments (plus dividend equivalents). --- Signature --- /s/ /s/ Louis Lalli, as an agent for Shane Alden Campbell (2026-05-14)