WST
West Pharmaceutical Services, Inc. · Healthcare · Medical - Instruments & Supplies
Momentum inputs (comparable managers): holder breadth 0.0% · share flow +1.8% · net new positions 0.0% — formula
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 162 | +3 | 50.43M | $18.09B | +8 | −4 |
| Q1 2026 | 161 | -2 | 49.75M | $12.46B | +4 | −7 |
| Q4 2025 | 162 | +3 | 53.70M | $14.74B | +5 | −1 |
| Q3 2025 | 21 | -1 | 26.99M | $7.08B | — | −2 |
| Q2 2025 | 20 | 0 | 24.84M | $5.43B | +1 | −1 |
| Q1 2025 | 17 | +2 | 8.37M | $1.87B | +2 | — |
| Q4 2024 | 15 | +2 | 8.55M | $2.80B | +2 | — |
| Q3 2024 | 12 | -1 | 4.43M | $1.33B | — | −1 |
| Q2 2024 | 13 | — | 5.33M | $1.75B | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 9.32M | — | $2.04B | 0.0% | n/c | 1 | SEC ↗ ×5 |
| 2 | BlackRock ✦ (passive) | 6.60M | — | $1.45B | 0.0% | n/c | 1 | SEC ↗ ×21 |
| 3 | State Street Global Advisors ✦ (passive) | 3.27M | +2.1% | $715.88M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 4 | Geode Capital Management ✦ (passive) | 1.83M | -1.1% | $399.36M | 0.0% | ▼ Trim | 5 | SEC ↗ ×2 |
| 5 | Norges Bank ✦ (passive) | 917.79K | +1.6% | $200.81M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 6 | Two Sigma Investments ✦ | 584.07K | +11.7% | $127.79M | 0.2% | ▲ Add | 5 | SEC ↗ |
| 7 | Millennium Management ✦ | 465.59K | +53.0% | $101.87M | 0.1% | ▲ Add | 3 | SEC ↗ |
| 8 | Gates Foundation Trust ✦ | 444.50K | 0.0% | $97.26M | 0.2% | Held | 2 | SEC ↗ |
| 9 | Point72 Asset Management ✦ | 339.95K | +165.0% | $74.38M | 0.2% | ▲ Add | 3 | SEC ↗ |
| 10 | D. E. Shaw & Co. ✦ | 284.34K | +176.0% | $62.21M | 0.1% | ▲ Add | 5 | SEC ↗ ×2 |
| 11 | Arrowstreet Capital ✦ | 129.03K | +212.0% | $28.23M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 12 | Citadel Advisors ✦ | 128.79K | -54.1% | $28.18M | 0.0% | ▼ Trim | 5 | SEC ↗ ×2 |
| 13 | T. Rowe Price ✦ | 117.63K | -24.0% | $25.74M | 0.0% | ▼ Trim | 5 | SEC ↗ ×2 |
| 14 | AQR Capital Management ✦ | 104.95K | +2295.6% | $22.96M | 0.0% | ▲ Add | 5 | SEC ↗ ×6 |
| 15 | Fidelity (FMR) ✦ | 104.78K | — | $22.93M | 0.0% | n/c | 1 | SEC ↗ ×3 |
| 16 | Adage Capital Partners ✦ | 65.81K | -68.8% | $14.40M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 17 | Marshall Wace ✦ | 62.53K | -62.4% | $13.68M | 0.0% | ▼ Trim | 5 | SEC ↗ ×3 |
| 18 | Fisher Asset Management ✦ | 24.34K | -17.0% | $5.33M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 19 | Renaissance Technologies ✦ | 24.30K | New | $5.32M | 0.0% | New | 1 | SEC ↗ |
| 20 | Wellington Management ✦ | 13.81K | +2.3% | $3.02M | 0.0% | ▲ Add | 5 | SEC ↗ ×2 |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Renaissance Technologies | $5.32M | 0.0% |
Exited
| Gotham Asset Management | $467,909 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 749 holders, 70.07M shares, $16.37B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Officer · 2.52K sh · $921,260
Officer · 2.50K sh · $887,500
Officer · 2.50K sh · $862,500
Officer · 2.82K sh · $960,062
Officer · 2.82K sh · $960,403
Officer · 2.50K sh · $852,025
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology