WST
West Pharmaceutical Services, Inc. · Healthcare · Medical - Instruments & Supplies
Momentum inputs (comparable managers):
holder breadth -7.7% ·
share flow -17.0% ·
net new positions -8.3%
· formula
Broad distribution: falling shares and fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 160 | +3 | 50.04M | $17.95B | +8 | −6 |
| 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 | n/a | −2 |
| Q2 2025 | 20 | 0 | 24.84M | $5.43B | +1 | −1 |
| Q1 2025 | 17 | +2 | 8.37M | $1.87B | +2 | n/a |
| Q4 2024 | 15 | +2 | 8.55M | $2.80B | +2 | n/a |
| Q3 2024 | 12 | -1 | 4.43M | $1.33B | n/a | −1 |
| Q2 2024 | 13 | n/a | 5.33M | $1.75B | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Geode Capital Management ✦ (passive) | 1.74M | +0.7% | $520.57M | 0.0% | ▲ Add | 2 | SEC ↗ ×2 |
| 2 | T. Rowe Price ✦ | 1.26M | -25.5% | $378.65M | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 3 | Norges Bank ✦ (passive) | 865.94K | -0.1% | $259.92M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 4 | Adage Capital Partners ✦ | 178.41K | +5.0% | $53.55M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 5 | Two Sigma Investments ✦ | 144.72K | +75.7% | $43.44M | 0.1% | ▲ Add | 2 | SEC ↗ |
| 6 | Marshall Wace ✦ | 128.26K | +167.3% | $38.50M | 0.1% | ▲ Add | 2 | SEC ↗ ×3 |
| 7 | Citadel Advisors ✦ | 48.13K | -82.8% | $14.45M | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 8 | Fisher Asset Management ✦ | 28.74K | -0.1% | $8.63M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 9 | AQR Capital Management ✦ | 15.26K | -13.1% | $4.58M | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 10 | D. E. Shaw & Co. ✦ | 7.92K | -48.0% | $2.38M | 0.0% | ▼ Trim | 2 | SEC ↗ ×2 |
| 11 | Wellington Management ✦ | 6.56K | +13.9% | $1.97M | 0.0% | ▲ Add | 2 | SEC ↗ ×3 |
| 12 | Gotham Asset Management ✦ | 2.16K | +2.5% | $648,946 | 0.0% | ▲ Add | 2 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| No new tracked buyers this quarter. |
Exited
| Millennium Management | $129.73M | was 0.1% |
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