ALNY Alnylam Pharmaceuticals Inc
Alnylam Pharmaceuticals Inc (ALNY) Institutional Ownership
What the institutions did with ALNY last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| FMR LLC | 15.0M | 11.3% |
| Capital World Investors | 11.1M | 8.3% |
| BlackRock, Inc. | 10.9M | 8.2% |
| Capital Research Global Investors | 9.8M | 7.3% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 6.5M | 4.9% |
| VANGUARD CAPITAL MANAGEMENT LLC | 6.0M | 4.5% |
| T. Rowe Price Investment Management, Inc. | 5.6M | 4.2% |
| Invesco Ltd. | 3.8M | 2.8% |
| STATE STREET CORP | 3.6M | 2.7% |
| JPMORGAN CHASE & CO | 2.7M | 2.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 2.6M | 2.0% |
| BAILLIE GIFFORD & CO | 2.4M | 1.8% |
| NORGES BANK | 2.3M | 1.7% |
| WELLINGTON MANAGEMENT GROUP LLP | 2.1M | 1.6% |
| Orbis Allan Gray Ltd | 2.0M | 1.5% |
| Dodge & Cox | 2.0M | 1.5% |
| TWO SIGMA INVESTMENTS, LP | 1.9M | 1.4% |
| AMERICAN CENTURY COMPANIES INC | 1.9M | 1.4% |
| Clearbridge Investments, LLC | 1.3M | 0.9% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1.1M | 0.9% |
| D. E. Shaw & Co., Inc. | 1.1M | 0.8% |
| MORGAN STANLEY | 1.0M | 0.8% |
| BANK OF AMERICA CORP /DE/ | 994.5K | 0.7% |
| Legal & General Group Plc | 924.6K | 0.7% |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | 893.8K | 0.7% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| JPMORGAN CHASE & CO | Reduced | 6.3M | 2.7M | -3.6M |
| MARSHALL WACE, LLP | Reduced | 1.1M | 259.8K | -839.5K |
| Deep Track Capital, LP | New | 0 | 825.0K | +825.0K |
| Orbis Allan Gray Ltd | Increased | 1.3M | 2.0M | +652.6K |
| LOS ANGELES CAPITAL MANAGEMENT LLC | Increased | 88.3K | 729.6K | +641.4K |
| Paradigm Biocapital Advisors LP | New | 0 | 480.0K | +480.0K |
| BlackRock, Inc. | Increased | 10.4M | 10.9M | +462.8K |
| T. Rowe Price Investment Management, Inc. | Increased | 5.2M | 5.6M | +448.8K |
| FMR LLC | Increased | 14.6M | 15.0M | +444.8K |
| Capital World Investors | Increased | 10.8M | 11.1M | +342.5K |
| Invesco Ltd. | Reduced | 4.1M | 3.8M | -320.8K |
| PRICE T ROWE ASSOCIATES INC /MD/ | Reduced | 1.4M | 1.1M | -283.5K |
| Capital Research Global Investors | Increased | 9.5M | 9.8M | +279.5K |
| Allspring Global Investments Holdings, LLC | Reduced | 281.8K | 2.5K | -279.2K |
| Bellevue Group AG | Reduced | 234.5K | 1.1K | -233.5K |
| STATE STREET CORP | Increased | 3.3M | 3.6M | +233.0K |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | Increased | 662.4K | 893.8K | +231.4K |
| Polar Capital Holdings Plc | Increased | 257.7K | 482.8K | +225.1K |
| Squarepoint Ops LLC | Reduced | 426.7K | 234.0K | -192.7K |
| AQR CAPITAL MANAGEMENT LLC | Reduced | 913.1K | 728.0K | -185.1K |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | Reduced | 189.2K | 4.5K | -184.7K |
| Assenagon Asset Management S.A. | Increased | 128.9K | 311.4K | +182.5K |
| WELLINGTON MANAGEMENT GROUP LLP | Increased | 1.9M | 2.1M | +174.5K |
| UBS Group AG | Increased | 458.9K | 627.0K | +168.1K |
| CITADEL ADVISORS LLC | Increased | 23.4K | 191.0K | +167.6K |
| JACOBS LEVY EQUITY MANAGEMENT, INC | Reduced | 212.2K | 61.0K | -151.2K |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | Reduced | 496.0K | 350.6K | -145.4K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 447.9K | 316.0K | -131.9K |
| Amundi | Reduced | 747.5K | 617.5K | -130.1K |
| CANADA PENSION PLAN INVESTMENT BOARD | Increased | 208.9K | 334.2K | +125.3K |
| HRT FINANCIAL LP | Reduced | 128.6K | 5.4K | -123.2K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 174.3K | 294.5K | +120.2K |
| Vinva Investment Management Ltd | Increased | 36.6K | 155.0K | +118.4K |
| TWO SIGMA INVESTMENTS, LP | Reduced | 2.0M | 1.9M | -116.6K |
| Davern Capital Partners, LP | New | 0 | 113.1K | +113.1K |
| Longaeva Partners L.P. | New | 0 | 110.3K | +110.3K |
| Hudson Bay Capital Management LP | Increased | 40.0K | 148.7K | +108.7K |
| GOLDMAN SACHS GROUP INC | Increased | 469.4K | 574.8K | +105.4K |
| ORBIMED ADVISORS LLC | Reduced | 119.0K | 17.0K | -102.0K |
| Soleus Capital Management, L.P. | Reduced | 131.7K | 33.1K | -98.6K |
| Clearbridge Investments, LLC | Reduced | 1.4M | 1.3M | -96.6K |
| Candriam S.C.A. | Increased | 224.3K | 314.5K | +90.2K |
| Balyasny Asset Management L.P. | New | 0 | 89.5K | +89.5K |
| BARCLAYS PLC | Reduced | 220.6K | 135.5K | -85.1K |
| ROYAL BANK OF CANADA | Increased | 791.5K | 875.9K | +84.3K |
| Caisse de depot et placement du Quebec | Increased | 2.0K | 85.7K | +83.8K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 5.9M | 6.0M | +82.8K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Increased | 673.4K | 755.4K | +82.0K |
| PINEBRIDGE INVESTMENTS LLC | Reduced | 271.4K | 195.7K | -75.7K |
| Fiera Capital Corp | Reduced | 78.8K | 3.5K | -75.3K |
| LOOMIS SAYLES & CO L P | Increased | 512.1K | 580.2K | +68.1K |
| Quadrature Capital Ltd | Reduced | 85.2K | 22.7K | -62.6K |
| Robeco Institutional Asset Management B.V. | Increased | 126.5K | 188.1K | +61.6K |
| Man Group plc | Reduced | 232.4K | 170.9K | -61.5K |
| LMR Partners LLP | Increased | 74.7K | 134.2K | +59.6K |
| PFA Pension, Forsikringsaktieselskab | Reduced | 59.7K | 434 | -59.3K |
| BROWN ADVISORY INC | Reduced | 134.0K | 77.4K | -56.6K |
| BAILLIE GIFFORD & CO | Reduced | 2.5M | 2.4M | -54.0K |
| DEUTSCHE BANK AG\ | Increased | 761.5K | 815.4K | +53.9K |
| AMERICAN CENTURY COMPANIES INC | Increased | 1.8M | 1.9M | +51.6K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.