ALNY
Alnylam Pharmaceuticals, Inc. · Healthcare · Biotechnology
Momentum inputs (comparable managers):
holder breadth +11.8% ·
share flow -4.1% ·
net new positions +10.5%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 162 | +3 | 107.60M | $32.37B | +7 | −3 |
| Q1 2026 | 161 | -2 | 108.78M | $35.89B | +4 | −7 |
| Q4 2025 | 162 | -2 | 118.83M | $47.26B | +1 | −2 |
| Q3 2025 | 24 | +1 | 85.59M | $39.02B | +2 | −2 |
| Q2 2025 | 21 | -1 | 76.99M | $25.10B | — | −1 |
| Q1 2025 | 19 | +2 | 40.24M | $10.86B | +3 | −1 |
| Q4 2024 | 17 | 0 | 41.95M | $9.87B | — | — |
| Q3 2024 | 16 | +1 | 39.28M | $10.80B | +2 | −1 |
| Q2 2024 | 15 | — | 40.30M | $9.79B | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Capital World Investors ✦ | 16.75M | +0.9% | $4.52B | 0.7% | ▲ Add | 4 | SEC ↗ |
| 2 | Baillie Gifford ✦ | 3.66M | -9.5% | $987.63M | 0.9% | ▼ Trim | 4 | SEC ↗ ×4 |
| 3 | T. Rowe Price ✦ | 3.51M | +5.6% | $946.47M | 0.1% | ▲ Add | 4 | SEC ↗ ×2 |
| 4 | State Street Global Advisors ✦ (passive) | 3.37M | -1.6% | $909.04M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 5 | Dodge & Cox ✦ | 3.35M | -5.3% | $905.04M | 0.5% | ▼ Trim | 4 | SEC ↗ |
| 6 | Wellington Management ✦ | 2.61M | -37.8% | $705.02M | 0.1% | ▼ Trim | 4 | SEC ↗ ×8 |
| 7 | Geode Capital Management ✦ (passive) | 2.32M | +5.3% | $625.82M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 8 | Norges Bank ✦ (passive) | 2.14M | -13.0% | $576.77M | 0.1% | ▼ Trim | 4 | SEC ↗ |
| 9 | AQR Capital Management ✦ | 828.34K | +1.8% | $217.03M | 0.2% | ▲ Add | 4 | SEC ↗ ×7 |
| 10 | Point72 Asset Management ✦ | 300.63K | New | $81.18M | 0.2% | New | 1 | SEC ↗ |
| 11 | D. E. Shaw & Co. ✦ | 289.86K | -20.2% | $78.27M | 0.1% | ▼ Trim | 4 | SEC ↗ ×2 |
| 12 | Millennium Management ✦ | 287.34K | -13.8% | $77.59M | 0.1% | ▼ Trim | 4 | SEC ↗ |
| 13 | Adage Capital Partners ✦ | 282.18K | +203.2% | $76.20M | 0.1% | ▲ Add | 4 | SEC ↗ |
| 14 | Marshall Wace ✦ | 268.93K | -29.0% | $72.62M | 0.1% | ▼ Trim | 3 | SEC ↗ ×3 |
| 15 | Two Sigma Investments ✦ | 197.41K | +84.3% | $53.31M | 0.1% | ▲ Add | 4 | SEC ↗ |
| 16 | Soros Fund Management ✦ | 60.00K | New | $16.20M | 0.4% | New | 1 | SEC ↗ |
| 17 | Gotham Asset Management ✦ | 14.52K | +32.9% | $3.92M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 18 | Citadel Advisors ✦ | 4.24K | -93.5% | $1.14M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 19 | Arrowstreet Capital ✦ | 4.05K | New | $1.09M | 0.0% | New | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Point72 Asset Management | $81.18M | 0.2% |
| Soros Fund Management | $16.20M | 0.4% |
| Arrowstreet Capital | $1.09M | 0.0% |
Exited
| Bridgewater Associates | $1.52M | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 781 holders, 122.25M shares, $37.95B 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 · 1.76K sh · $398,855
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology