WST's three largest insider shareholders as of September 09, 2026 are Eric Mark Green (President, Ceo And Board Chair, 175.16K shares), Douglas A Michels (Director, 46.50K shares), Thomas W Hofmann (Director, 44.64K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Eric Mark Green | President, Ceo And Board Chair | 175,161 | 0 | 175,161 | 37.7% | 19 Feb, 2026 |
| 2 | Douglas A Michels | Director | 46,496 | 0 | 46,496 | 10.0% | 06 May, 2026 |
| 3 | Thomas W Hofmann | Director | 44,637 | 0 | 44,637 | 9.6% | 08 May, 2025 |
| 4 | Mark A Buthman | Director | 44,309 | 0 | 44,309 | 9.5% | 06 May, 2026 |
| 5 | William F Feehery | Director | 32,519 | 0 | 32,519 | 7.0% | 06 May, 2026 |
| 6 | Goldman Myla Lai | Director | 20,435 | 0 | 20,435 | 4.4% | 06 May, 2026 |
| 7 | Annette F Favorite | Sr. Vp Chief Hr Officer | 16,828 | 0 | 16,828 | 3.6% | 29 Apr, 2026 |
| 8 | David A Montecalvo | Svp, Glob Ops And Supply Chain | 13,731 | 0 | 13,731 | 3.0% | 24 Feb, 2022 |
| 9 | Paolo Pucci | Director | 11,854 | 0 | 11,854 | 2.6% | 06 May, 2026 |
| 10 | Deborah L Keller | Director | 10,657 | 0 | 10,657 | 2.3% | 08 May, 2025 |
| 11 | Bernard Birkett | Sr Vp, Chief Financial Officer | 7,520 | 0 | 7,520 | 1.6% | 20 Feb, 2025 |
| 12 | Robert W. Mcmahon | Svp Chief Financial Officer | 7,021 | 0 | 7,021 | 1.5% | 12 Aug, 2026 |
| 13 | Cindy Reiss-Clark | Chief Commercial Officer | 5,047 | 0 | 5,047 | 1.1% | 20 Feb, 2025 |
| 14 | Robert F Friel | Director | 4,682 | 0 | 4,682 | 1.0% | 08 May, 2025 |
| 15 | Molly Joseph | Director | 4,398 | 0 | 4,398 | 0.9% | 06 May, 2026 |
| 16 | Quintin J Lai | Vp Strat Investor Relations | 4,359 | 0 | 4,359 | 0.9% | 22 Feb, 2024 |
| 17 | Stephen H Lockhart | Director | 3,523 | 0 | 3,523 | 0.8% | 06 May, 2026 |
| 18 | Silji Abraham | Svp, Chief Technology Officer | 3,138 | 0 | 3,138 | 0.7% | 31 Oct, 2024 |
| 19 | Janet Brutschea Haugen | Director | 2,373 | 0 | 2,373 | 0.5% | 06 May, 2026 |
| 20 | Chad Winters | Vp, Chief Accounting Officer | 1,523 | 0 | 1,523 | 0.3% | 29 Apr, 2026 |
| 21 | Kimberly Banks Mackay | Svp, Gc Corporate Secretary | 1,512 | 0 | 1,512 | 0.3% | 20 Feb, 2025 |
| 22 | Charles Witherspoon | Vp Treasurer | 1,408 | 0 | 1,408 | 0.3% | 23 Feb, 2026 |
| 23 | Shane Alden Campbell | Svp, Proprietary Segment | 613 | 0 | 613 | 0.1% | 14 May, 2026 |
| 24 | Rodolphe Jean Poussot | Svp, Strategy Corporate Dev | 561 | 0 | 561 | 0.1% | 23 Feb, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 11 Aug, 2026 | Robert W. Mcmahon | Svp Chief Financial Officer | Acquired M | 794 | — | — | 3,775 | Direct |
| 11 Aug, 2026 | Robert W. Mcmahon | Svp Chief Financial Officer | Disposed F | 346 | $351.37 | $121.40K | 3,429 | Direct |
| 11 Aug, 2026 | Robert W. Mcmahon | Svp Chief Financial Officer | Acquired M | 6,355 | — | — | 9,784 | Direct |
| 11 Aug, 2026 | Robert W. Mcmahon | Svp Chief Financial Officer | Disposed F | 2,764 | $351.37 | $971.07K | 7,021 | Direct |
| 11 Aug, 2026 | Robert W. Mcmahon | Svp Chief Financial Officer | Disposed M | 6,355 | $0.00 | $0 | 2,119 | Direct |
| 11 Aug, 2026 | Robert W. Mcmahon | Svp Chief Financial Officer | Disposed M | 794 | $0.00 | $0 | 2,383 | Direct |
| 12 May, 2026 | Shane Alden Campbell | Svp, Proprietary Segment | Acquired M | 296 | — | — | 358 | Direct |
| 12 May, 2026 | Shane Alden Campbell | Svp, Proprietary Segment | Disposed F | 84 | $312.07 | $26.32K | 274 | Direct |
| 12 May, 2026 | Shane Alden Campbell | Svp, Proprietary Segment | Acquired M | 474 | — | — | 748 | Direct |
| 12 May, 2026 | Shane Alden Campbell | Svp, Proprietary Segment | Disposed F | 135 | $312.07 | $42.11K | 613 | Direct |
| 12 May, 2026 | Shane Alden Campbell | Svp, Proprietary Segment | Disposed M | 296 | $0.00 | $0 | 886 | Direct |
| 12 May, 2026 | Shane Alden Campbell | Svp, Proprietary Segment | Disposed M | 474 | $0.00 | $0 | 1,417 | Direct |
| 04 May, 2026 | Paolo Pucci | Director | Acquired A | 791 | $0.00 | $0 | 11,854 | Direct |
| 04 May, 2026 | Deborah L Keller | Director | Acquired A | 791 | $0.00 | $0 | 11,560 | Direct |
| 04 May, 2026 | Douglas A Michels | Director | Acquired A | 791 | $0.00 | $0 | 46,496 | Direct |
| 04 May, 2026 | Molly Joseph | Director | Acquired A | 791 | $0.00 | $0 | 4,398 | Direct |
| 04 May, 2026 | Stephen H Lockhart | Director | Acquired A | 791 | $0.00 | $0 | 3,523 | Direct |
| 04 May, 2026 | William F Feehery | Director | Acquired A | 791 | $0.00 | $0 | 32,519 | Direct |
| 04 May, 2026 | Robert F Friel | Director | Acquired A | 791 | $0.00 | $0 | 5,513 | Direct |
| 04 May, 2026 | Janet Brutschea Haugen | Director | Acquired A | 791 | $0.00 | $0 | 2,373 | Direct |