West Pharmaceutical Services Inc
Ownership
Ownership Structure
Who owns West Pharmaceutical Services Inc (WST)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.3% of the shares are freely tradable; institutional investors hold 103.9%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 9.71 | 6,836,714 | +3.6 | 03/31/2026 |
| Vanguard Capital Management, LLC | 6.65 | 4,683,286 | +0.0 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.82 | 4,094,009 | +0.0 | 03/31/2026 |
| State Street Corp | 4.68 | 3,293,778 | +1.3 | 03/31/2026 |
| Bank of New York Mellon Corp | 3.50 | 2,465,858 | -7.4 | 03/31/2026 |
| Artisan Partners Limited Partnership | 3.43 | 2,411,792 | -9.3 | 06/30/2026 |
| T. Rowe Price Investment Management,Inc. | 3.33 | 2,340,403 | +18.9 | 03/31/2026 |
| Generation Investment Management LLP | 2.88 | 2,028,322 | -9.6 | 06/30/2026 |
| Geode Capital Management, LLC | 2.72 | 1,912,455 | +2.3 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.20 | 2,249,616 | +0.3 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Favorite Annette F | Sr. VP & Chief HR Officer | 21,818 | 7,998,409 $ | Sep 15, 2026 | direct |
| McMahon Robert W. | SVP & Chief Financial Officer | 7,021 | 2,573,717 $ | Aug 11, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 15, 2026 | Favorite Annette F | Sr. VP & Chief HR Officer | Sell | 2,524 | 365.00 | 921,260 |
| Sep 15, 2026 | Favorite Annette F | Sr. VP & Chief HR Officer | Other | 2,524 | 89.64 | 226,251 |
| Sep 14, 2026 | Favorite Annette F | Sr. VP & Chief HR Officer | Sell | 2,500 | 355.00 | 887,500 |
| Sep 14, 2026 | Favorite Annette F | Sr. VP & Chief HR Officer | Other | 2,500 | 89.64 | 224,100 |
| Sep 11, 2026 | Favorite Annette F | Sr. VP & Chief HR Officer | Sell | 2,500 | 345.00 | 862,500 |
| Sep 11, 2026 | Favorite Annette F | Sr. VP & Chief HR Officer | Other | 2,500 | 89.64 | 224,100 |
| Sep 8, 2026 | Favorite Annette F | Sr. VP & Chief HR Officer | Sell | 2,500 | 340.81 | 852,025 |
| Sep 8, 2026 | Favorite Annette F | Sr. VP & Chief HR Officer | Other | 2,500 | 89.64 | 224,100 |
| Sep 8, 2026 | Favorite Annette F | Sr. VP & Chief HR Officer | Sell | 2,818 | 340.81 | 960,403 |
| Sep 8, 2026 | Favorite Annette F | Sr. VP & Chief HR Officer | Other | 2,818 | 83.47 | 235,218 |
| Sep 8, 2026 | Favorite Annette F | Sr. VP & Chief HR Officer | Sell | 2,817 | 340.81 | 960,062 |
| Sep 8, 2026 | Favorite Annette F | Sr. VP & Chief HR Officer | Other | 2,817 | 83.47 | 235,135 |
| Aug 11, 2026 | McMahon Robert W. | SVP & Chief Financial Officer | Other | 2,764 | 351.37 | 971,187 |
| Aug 11, 2026 | McMahon Robert W. | SVP & Chief Financial Officer | Other | 6,355 | – | – |
| Aug 11, 2026 | McMahon Robert W. | SVP & Chief Financial Officer | Other | 346 | 351.37 | 121,574 |
| Aug 11, 2026 | McMahon Robert W. | SVP & Chief Financial Officer | Other | 794 | – | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.