Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in WST held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 6.8M | $1.71B | +3.6% | 9.485% | 0.03% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 4.7M | $1.17B | — | 6.497% | 0.03% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 4.1M | $1.03B | — | 5.680% | 0.05% |
| 4 | STATE STREET CORP | 3.3M | $825.6M | +1.3% | 4.569% | 0.03% |
| 5 | Artisan Partners Limited Partnership | 2.7M | $666.2M | -6.8% | 3.687% | 1.08% |
| 6 | Bank of New York Mellon Corp | 2.5M | $618.0M | -7.4% | 3.421% | 0.11% |
| 7 | GENERATION INVESTMENT MANAGEMENT LLP | 2.2M | $562.4M | +43.7% | 3.113% | 5.04% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 1.9M | $477.5M | +2.3% | 2.653% | 0.03% |
| 9 | MORGAN STANLEY | 1.5M | $365.5M | -4.8% | 2.023% | 0.02% |
| 10 | BROWN ADVISORY INC | 1.3M | $336.1M | -31.0% | 1.860% | 0.55% |
| 11 | Longview Partners (Guernsey) LTD | 1.3M | $329.7M | +16.3% | 1.825% | 4.67% |
| 12 | FMR LLC | 1.2M | $313.2M | +1039.7% | 1.734% | 0.02% |
| 13 | APG Asset Management N.V. | 1.3M | $275.7M | +5.7% | 1.758% | 0.87% |
| 14 | Invesco Ltd. | 1.1M | $264.7M | +16.2% | 1.465% | 0.04% |
| 15 | UBS ASSET MANAGEMENT AMERICAS INC | 903K | $226.3M | -0.3% | 1.252% | 0.05% |
| 16 | KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC | 858K | $215.1M | -10.1% | 1.191% | 0.63% |
| 17 | TD ASSET MANAGEMENT INC | 769K | $192.7M | +27.0% | 1.067% | 0.16% |
| 18 | NORTHERN TRUST CORP | 731K | $183.3M | +0.7% | 1.014% | 0.02% |
| 19 | GOLDMAN SACHS GROUP INC | 728K | $182.4M | +65.4% | 1.009% | 0.02% |
| 20 | JACOBS LEVY EQUITY MANAGEMENT, INC | 705K | $176.8M | +10.3% | 0.979% | 0.74% |
| 21 | ProShare Advisors LLC | 660K | $165.4M | +12.5% | 0.916% | 0.24% |
| 22 | Amundi | 644K | $161.4M | +85.4% | 0.894% | 0.04% |
| 23 | Findlay Park Partners LLP | 617K | $154.6M | -7.5% | 0.856% | 2.15% |
| 24 | Capital Research Global Investors | 604K | $151.4M | — | 0.838% | 0.02% |
| 25 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 554K | $138.9M | +2.1% | 0.769% | 0.02% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in WST — a direct measure of their conviction.
Filings activity in WST during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 740 | 6.2% | 69.39% | 6.81 pp | $16.45B | 8.9% |
| Q4 2025 | 789 | +6.9% | 76.20% | +3.31 pp | $18.06B | +4.5% |
| Q3 2025 | 738 | +2.5% | 72.89% | +10.71 pp | $17.28B | +17% |
| Q2 2025 | 720 | +3.7% | 62.18% | +0.36 pp | $14.74B | +0.6% |
| Q1 2025 | 694 | 4.0% | 61.82% | 29.24 pp | $14.65B | 32% |
| Q4 2024 | 723 | +2.3% | 91.06% | +8.17 pp | $21.58B | +9.9% |
| Q3 2024 | 707 | 7.0% | 82.89% | 9.71 pp | $19.65B | 10% |
| Q2 2024 | 760 | — | 92.60% | — | $21.95B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying WST stock.
Based on Q1 2026 13F filings, institutional ownership of West Pharmaceutical Services, Inc. stands at 69.4%, held across 740 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of WST, with approximately 6,836,714 shares worth $1.71B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of WST.
Our composite Smart Money Score for WST is 16 out of 100 (Heavy Distribution). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
95 institutions opened new positions in WST during Q1 2026, while 144 fully exited. 165 added to existing positions and 477 trimmed.
WST institutional ownership fell by 6.81 percentage points quarter-over-quarter, with a net change of -49 holders.
The top 10 institutions account for 47.2% of all reported 13F value in WST, and the top 25 account for 66.2%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
West Pharmaceutical Services, Inc. (WST) Institutional Ownership