WST's three largest insider shareholders as of March 23, 2026 are Eric Mark Green (President, Ceo And Board Chair, 175.16K shares), Patrick J Zenner (Director, 67.51K shares), Douglas A Michels (Director, 45.17K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Eric Mark Green | President, Ceo And Board Chair | 175,161 | 0 | 19 Feb, 2026 |
| Patrick J Zenner | 67,509 | 0 | 06 May, 2021 | |
| Douglas A Michels | 45,171 | 0 | 08 May, 2025 | |
| Thomas W Hofmann | 44,637 | 0 | 08 May, 2025 | |
| Mark A Buthman | 42,861 | 0 | 08 May, 2025 | |
| William F Feehery | 31,363 | 0 | 08 May, 2025 | |
| Goldman Myla Lai | 19,424 | 0 | 08 May, 2025 | |
| Annette F Favorite | Sr. Vp Chief Hr Officer | 17,374 | 0 | 19 Feb, 2026 |
| David A Montecalvo | Svp, Glob Ops And Supply Chain | 13,731 | 0 | 24 Feb, 2022 |
| Paolo Pucci | 10,947 | 0 | 08 May, 2025 | |
| Deborah L Keller | 10,657 | 0 | 08 May, 2025 | |
| Bernard Birkett | Sr Vp, Chief Financial Officer | 7,520 | 0 | 20 Feb, 2025 |
| Cindy Reiss-Clark | Chief Commercial Officer | 5,047 | 0 | 20 Feb, 2025 |
| Robert F Friel | 4,682 | 0 | 08 May, 2025 | |
| Quintin J Lai | Vp Strat Investor Relations | 4,359 | 0 | 22 Feb, 2024 |
| Silji Abraham | Svp, Chief Technology Officer | 3,138 | 0 | 31 Oct, 2024 |
| Robert W. Mcmahon | Svp Chief Financial Officer | 2,980 | 0 | 12 Feb, 2026 |
| Molly Joseph | 2,884 | 0 | 08 May, 2025 | |
| Stephen H Lockhart | 2,708 | 0 | 08 May, 2025 | |
| Chad Winters | Vp, Chief Accounting Officer | 1,523 | 0 | 23 Feb, 2026 |
| Kimberly Banks Mackay | Svp, Gc Corporate Secretary | 1,512 | 0 | 20 Feb, 2025 |
| Charles Witherspoon | Vp Treasurer | 1,408 | 0 | 23 Feb, 2026 |
| Janet Brutschea Haugen | 1,318 | 0 | 08 May, 2025 | |
| Rodolphe Jean Poussot | Svp, Strategy Corporate Dev | 561 | 0 | 23 Feb, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 01 Mar, 2026 | Eric Mark Green | Rst. Stock Unit | A | 6,986 | $0.00 | 6,986 | D | A |
| 01 Mar, 2026 | Rodolphe Jean Poussot | Rst. Stock Unit | A | 437 | $0.00 | 437 | D | A |
| 01 Mar, 2026 | Chad Winters | Rst. Stock Unit | A | 340 | $0.00 | 340 | D | A |
| 01 Mar, 2026 | Annette F Favorite | Rst. Stock Unit | A | 720 | $0.00 | 720 | D | A |
| 01 Mar, 2026 | Norman D. Jr. Finch | Rst. Stock Unit | A | 1,285 | $0.00 | 1,285 | D | A |
| 01 Mar, 2026 | Robert W. Mcmahon | Rst. Stock Unit | A | 3,082 | $0.00 | 3,082 | D | A |
| 01 Mar, 2026 | Shane Alden Campbell | Rst. Stock Unit | A | 1,131 | $0.00 | 1,131 | D | A |
| 01 Mar, 2026 | Norman D. Jr. Finch | Stock Option (Right to Buy) | A | 3,057 | $0.00 | 3,057 | D | A |
| 01 Mar, 2026 | Chad Winters | Stock Option (Right to Buy) | A | 808 | $0.00 | 808 | D | A |
| 01 Mar, 2026 | Shane Alden Campbell | Stock Option (Right to Buy) | A | 2,691 | $0.00 | 2,691 | D | A |
| 01 Mar, 2026 | Rodolphe Jean Poussot | Stock Option (Right to Buy) | A | 1,040 | $0.00 | 1,040 | D | A |
| 01 Mar, 2026 | Annette F Favorite | Stock Option (Right to Buy) | A | 1,712 | $0.00 | 1,712 | D | A |
| 01 Mar, 2026 | Robert W. Mcmahon | Stock Option (Right to Buy) | A | 7,337 | $0.00 | 7,337 | D | A |
| 01 Mar, 2026 | Eric Mark Green | Stock Option (Right to Buy) | A | 16,630 | $0.00 | 16,630 | D | A |
| 20 Feb, 2026 | Charles Witherspoon | Common Stock | A | 60 | - | 1,430 | D | M |
| 20 Feb, 2026 | Chad Winters | Common Stock | A | 89 | - | 1,553 | D | M |
| 20 Feb, 2026 | Rodolphe Jean Poussot | Common Stock | A | 383 | - | 691 | D | M |
| 20 Feb, 2026 | Chad Winters | Common Stock | D | 30 | $241.12 | 1,523 | D | F |
| 20 Feb, 2026 | Charles Witherspoon | Common Stock | D | 22 | $241.12 | 1,408 | D | F |
| 20 Feb, 2026 | Rodolphe Jean Poussot | Common Stock | D | 130 | $241.12 | 561 | D | F |