ALNYLAM PHARMACEUTICALS, INC. hedge fund holdings
ALNYNASDAQ$219.72-11.46 (-4.96% today)
Every quarter, large institutional investment managers with over $100M in U.S.-listed assets under management disclose their U.S. equity holdings through 13F filings. Read together, those filings show which businesses professional capital is moving into and out of.
Price vs funds buying and selling
ALNY · close · 13FReported Aug 14, 2026Price vs funds buying and selling data
Showing the 1Y range: Oct 2, 2025 to Oct 2, 2026. Price (-52.3%). 0 fund reports plotted in this window as 0 markers; nearby trades of the same kind are grouped.
| Date | Category | Person | Role | Action | Amount | Change in holding |
|---|
Funds buying · new + increased
Funds selling · reduced + closed
Net buyers vs sellers
Buying = new + increased; selling = reduced + closed. Counts exclude position changes under 5% of the fund's holding last quarter.Price and fund activity data
| Quarter | Funds buying | Funds selling | Bought | Sold | Filers | Reported |
|---|---|---|---|---|---|---|
| Q2 2025 | 254 | 211 | $3B | $2.02B | 605 | Aug 14, 2025 |
| Q3 2025 | 397 | 190 | $8.72B | $7.07B | 778 | Nov 14, 2025 |
| Q4 2025 | 316 | 285 | $4.35B | $5.84B | 804 | Feb 14, 2026 |
| Q1 2026 | 297 | 307 | $5.18B | $4.74B | 750 | May 15, 2026 |
| Q2 2026 | 281 | 240 | $2.65B | $2.51B | 737 | Aug 14, 2026 |
Quarterly action breakdown
Q2 2026
737 filersNew position
70$537M+1.78M sh
Increased
211$2.11B+7.03M sh
Reduced
170-$2.46B-8.18M sh
Out / sold
70-$48.4M-161K sh
Last 4 quarters · free
Reported Aug 14, 2026
| Fund | Action | Change in dollar | Value | % of portfolio | Reported |
|---|---|---|---|---|---|
| Deep Track Capital, LP | New Buy | +$248M | $248M | 3.61% | Aug 14, 2026 |
| Orbis Allan Gray Ltd | Added 48.89% | +$196M | $598M | 2.06% | Aug 14, 2026 |
| Paradigm Biocapital Advisors LP | New Buy | +$144M | $144M | 2.71% | Aug 14, 2026 |
| T. Rowe Price Investment Management, Inc. | Added 8.64% | +$135M | $1.7B | 1.11% | Aug 14, 2026 |
| Capital World Investors | Added 3.17% | +$103M | $3.35B | 0.40% | Aug 12, 2026 |
| Bellevue Group AG | Reduce 99.53% | -$70.3M | $329K | 0.01% | Aug 14, 2026 |
| Polar Capital Holdings Plc | Added 87.35% | +$67.8M | $145M | 0.34% | Aug 14, 2026 |
| Voloridge Investment Management, LLC | Reduce 97.62% | -$55.6M | $1.35M | 0.01% | Aug 14, 2026 |
| Wellington Management Group LLP | Added 9.01% | +$52.5M | $635M | 0.11% | Aug 14, 2026 |
| Massachusetts Financial Services Co | Reduce 29.32% | -$43.8M | $106M | 0.03% | Aug 3, 2026 |
| Canada Pension Plan Investment Board | Added 59.97% | +$37.7M | $101M | 0.06% | Aug 14, 2026 |
| Vinva Investment Management Ltd | Added 323.41% | +$34.7M | $45.5M | 0.30% | Aug 14, 2026 |
| Davern Capital Partners, LP | New Buy | +$34M | $34M | 5.80% | Aug 13, 2026 |
| Longaeva Partners L.P. | New Buy | +$33.2M | $33.2M | 0.73% | Aug 14, 2026 |
| Caisse de depot et placement du Quebec | Added 4213.28% | +$25.2M | $25.8M | 0.04% | Aug 14, 2026 |
| Pinebridge Investments LLC | Reduce 27.89% | -$22.8M | $58.9M | 0.49% | Aug 14, 2026 |
| Fiera Capital Corp | Reduce 95.53% | -$22.7M | $1.06M | 0.00% | Aug 7, 2026 |
| Loomis Sayles & Co L P | Added 13.30% | +$20.5M | $175M | 0.22% | Aug 14, 2026 |
| Robeco Institutional Asset Management B.V. | Added 48.73% | +$18.5M | $56.6M | 0.07% | Jul 21, 2026 |
| PFA Pension, Forsikringsaktieselskab | Reduce 99.27% | -$17.8M | $131K | 0.00% | Aug 12, 2026 |
| Baillie Gifford & Co | Reduce 2.16% | -$16.2M | $734M | 0.67% | Aug 6, 2026 |
| Korea Investment CORP | Added 23.63% | +$14.3M | $74.6M | 0.14% | Aug 12, 2026 |
| Aberdeen Group plc | Reduce 31.72% | -$13.2M | $28.4M | 0.04% | Jul 31, 2026 |
| Nomura Asset Management International Inc. | Added 15.95% | +$12.4M | $90.4M | 0.14% | Aug 14, 2026 |
| Pictet Asset Management Holding SA | Added 17.10% | +$12.2M | $83.3M | 0.08% | Jul 30, 2026 |
| First Trust Advisors LP | Added 10.15% | +$11.7M | $127M | 0.07% | Aug 11, 2026 |
| Mn Services Vermogensbeheer B.V. | New Buy | +$11.7M | $11.7M | 0.09% | Jul 31, 2026 |
| J. Goldman & Co LP | New Buy | +$11.6M | $11.6M | 0.30% | Aug 14, 2026 |
| VANGUARD ASSET MANAGEMENT, Ltd | Added 17.55% | +$11.6M | $77.6M | 0.05% | Aug 13, 2026 |
| FengHe Fund Management Pte. Ltd. | Sell 100% | -$10.8M | $0 | 0.00% | Aug 7, 2026 |
| SCS Capital Management LLC | Reduce 22.73% | -$10.2M | $34.8M | 0.33% | Aug 6, 2026 |
| Ofi Invest Asset Management | Added 5105.08% | +$9.8M | $9.99M | 0.10% | Jul 17, 2026 |
| Handelsbanken Fonder AB | Reduce 21.40% | -$8.79M | $32.3M | 0.09% | Jul 10, 2026 |
| Schroder Investment Management Group | Added 42.80% | +$8.59M | $28.7M | 0.02% | Aug 13, 2026 |
| Dodge & Cox | Added 1.35% | +$7.87M | $589M | 0.31% | Aug 13, 2026 |
| Tidal Investments LLC | Reduce 42.10% | -$7.34M | $10.1M | 0.02% | Aug 13, 2026 |
| Parkman Healthcare Partners LLC | Added 88.26% | +$7.15M | $15.3M | 1.56% | Aug 14, 2026 |
| Varma Mutual Pension Insurance Co | Sell 100% | -$6.98M | $0 | 0.00% | Aug 12, 2026 |
| DNB Asset Management AS | Added 72.07% | +$6.82M | $16.3M | 0.05% | Aug 11, 2026 |
| Thrivent Financial for Lutherans | Sell 100% | -$6.77M | $0 | 0.00% | Aug 14, 2026 |
| Prosight Management, LP | Added 29.05% | +$6.65M | $29.5M | 5.09% | Aug 14, 2026 |
| Oddo BHF Asset Management Sas | Reduce 66.46% | -$6.6M | $3.33M | 0.15% | Aug 13, 2026 |
| Ensign Peak Advisors, Inc | Reduce 31.33% | -$6.57M | $14.4M | 0.02% | Aug 14, 2026 |
| Mitsubishi UFJ Trust & Banking Corp | Added 28.68% | +$6.28M | $28.2M | 0.06% | Aug 6, 2026 |
| Catalyst Funds Management Pty Ltd | New Buy | +$6.26M | $6.26M | 0.35% | Aug 10, 2026 |
| SEB Asset Management AB | Added 67.49% | +$6.13M | $15.2M | 0.06% | Aug 4, 2026 |
| Congress Asset Management Co | Reduce 7.01% | -$6.03M | $80M | 0.49% | Jul 7, 2026 |
| Worldquant Millennium Advisors LLC | Added 47.49% | +$6.03M | $18.7M | 0.06% | Aug 14, 2026 |
| Public Sector Pension Investment Board | Sell 100% | -$5.96M | $0 | 0.00% | Aug 13, 2026 |
| Voleon Capital Management LP | Reduce 78.39% | -$5.68M | $1.57M | 0.03% | Aug 14, 2026 |
| Fjarde Ap-Fonden /Fourth Swedish National Pension Fund | Added 37.53% | +$5.5M | $20.2M | 0.10% | Jul 29, 2026 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | Reduce 10.13% | -$5.48M | $48.6M | 0.05% | Aug 13, 2026 |
| Rhenman & Partners Asset Management AB | Reduce 50.09% | -$5.2M | $5.18M | 0.49% | Aug 13, 2026 |
| Kornitzer Capital Management Inc | New Buy | +$5.15M | $5.15M | 0.11% | Jul 31, 2026 |
| Driehaus Capital Management LLC | Reduce 28.30% | -$5.08M | $12.9M | 0.07% | Aug 14, 2026 |
| Mitsubishi UFJ Asset Management Co., Ltd. | Added 10.82% | +$4.96M | $50.8M | 0.03% | Aug 7, 2026 |
| Capital Fund Management S.A. | Added 11.27% | +$4.75M | $46.9M | 0.21% | Aug 13, 2026 |
| Natixis | Reduce 91.97% | -$4.73M | $413K | 0.00% | Aug 13, 2026 |
| National Pension Service | Added 7.89% | +$4.37M | $59.7M | 0.04% | Aug 13, 2026 |
| 683 Capital Management, LLC | Added 66.67% | +$4.21M | $10.5M | 0.52% | Aug 14, 2026 |
| Nordea Investment Management AB | Added 101.66% | +$4.05M | $8.03M | 0.01% | Aug 5, 2026 |
| Tredje AP-fonden | Reduce 24.98% | -$3.73M | $11.2M | 0.05% | Aug 10, 2026 |
| CenterBook Partners LP | New Buy | +$3.66M | $3.66M | 0.18% | Aug 11, 2026 |
| PensionDanmark Pensionsforsikringsaktieselskab | Reduce 35.06% | -$3.65M | $6.76M | 0.06% | Jul 8, 2026 |
| CANADA LIFE ASSURANCE Co | Added 20.69% | +$3.56M | $20.8M | 0.03% | Aug 13, 2026 |
| Keystone Investors Pte Ltd | Sell 100% | -$3.53M | $0 | 0.00% | Aug 14, 2026 |
| Mirova | Reduce 85.09% | -$3.5M | $614K | 0.02% | Aug 13, 2026 |
| Silvercrest Asset Management Group LLC | Sell 100% | -$3.45M | $0 | 0.00% | Aug 14, 2026 |
| Sierra Summit Advisors LLC | Added 37.58% | +$3.43M | $12.5M | 1.40% | Jul 20, 2026 |
| Campbell & CO Investment Adviser LLC | New Buy | +$3.37M | $3.37M | 0.18% | Aug 3, 2026 |
| Gilder Gagnon Howe & Co LLC | Reduce 3.94% | -$3.32M | $81M | 0.84% | Aug 14, 2026 |
| Sumitomo Mitsui Trust Group, Inc. | Added 3.49% | +$3.3M | $97.9M | 0.06% | Jul 30, 2026 |
| Sphera Funds Management Ltd. | New Buy | +$3.25M | $3.25M | 0.42% | Aug 14, 2026 |
| NEOS Investment Management LLC | Added 13.65% | +$2.83M | $23.6M | 0.09% | Aug 11, 2026 |
| Liontrust Investment Partners LLP | Added 46.88% | +$2.57M | $8.06M | 0.12% | Aug 18, 2026 |
| OP Asset Management Ltd | Reduce 35.65% | -$2.52M | $4.55M | 0.05% | Jul 28, 2026 |
| Elyxium Wealth, LLC | New Buy | +$2.48M | $2.48M | 0.26% | Aug 3, 2026 |
| Portman Square Capital LLP | Added 47.81% | +$2.44M | $7.53M | 0.36% | Jul 15, 2026 |
| Jain Global LLC | Added 16.10% | +$2.33M | $16.8M | 0.07% | Aug 14, 2026 |
| USS Investment Management Ltd | Added 28.47% | +$2.3M | $10.4M | 0.04% | Aug 11, 2026 |
| Financiere des Professionnels - Fonds d'investissement inc. | Added 277.13% | +$2.24M | $3.05M | 0.17% | Aug 5, 2026 |
| Rock Springs Capital Management LP | Reduce 9.80% | -$2.18M | $20.1M | 0.98% | Aug 14, 2026 |
| Cibc World Market Inc. | New Buy | +$2.17M | $2.17M | 0.00% | Aug 13, 2026 |
| Polymer Capital Management (HK) LTD | Added 12.41% | +$2.16M | $19.6M | 0.99% | Aug 13, 2026 |
| Storebrand Asset Management As | Reduce 10.86% | -$2.11M | $17.3M | 0.04% | Aug 12, 2026 |
| Bridgewater Associates, LP | Reduce 6.57% | -$2.11M | $30M | 0.12% | Aug 14, 2026 |
| Westfield Capital Management Co LP | Added 2.79% | +$2.06M | $76M | 0.25% | Aug 12, 2026 |
| MUFG Securities EMEA plc | New Buy | +$2.03M | $2.03M | 0.02% | Aug 12, 2026 |
| Concurrent Investment Advisors, LLC | Added 695.87% | +$1.98M | $2.26M | 0.02% | Jul 27, 2026 |
| Edgestream Partners, L.P. | Sell 100% | -$1.92M | $0 | 0.00% | Aug 11, 2026 |
| Nomura Holdings Inc | Reduce 41.70% | -$1.8M | $2.51M | 0.00% | Aug 14, 2026 |
| ASR Vermogensbeheer N.V. | Reduce 52.11% | -$1.76M | $1.62M | 0.02% | Jul 20, 2026 |
| Kestra Investment Management, LLC | Reduce 68.82% | -$1.74M | $788K | 0.02% | Aug 5, 2026 |
| Swiss Life Asset Management Ltd | Added 23.57% | +$1.68M | $8.83M | 0.04% | Jul 29, 2026 |
| Arrowpoint Investment Partners (Singapore) Pte. Ltd. | New Buy | +$1.68M | $1.68M | 0.37% | Aug 13, 2026 |
| KLP Kapitalforvaltning As | Added 10.86% | +$1.67M | $17.1M | 0.06% | Aug 12, 2026 |
| Ci Investments Inc. | Added 153.59% | +$1.67M | $2.76M | 0.01% | Aug 13, 2026 |
| MML Investors Services, LLC | Reduce 35.74% | -$1.67M | $3M | 0.01% | Aug 7, 2026 |
| Susquehanna Portfolio Strategies, LLC | Sell 100% | -$1.66M | $0 | 0.00% | Aug 14, 2026 |
| Himension Capital (Singapore) Pte. Ltd. | Added 37.72% | +$1.5M | $5.46M | 0.33% | Aug 13, 2026 |