INSM Insmed Incorporated
Insmed Incorporated (INSM) Institutional Ownership
What the institutions did with INSM 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 | 16.1M | 7.2% |
| BlackRock, Inc. | 15.8M | 7.1% |
| JPMORGAN CHASE & CO | 10.4M | 4.7% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 10.4M | 4.6% |
| VANGUARD CAPITAL MANAGEMENT LLC | 9.8M | 4.4% |
| BAKER BROS. ADVISORS LP | 8.8M | 3.9% |
| Capital International Investors | 8.2M | 3.7% |
| Darwin Global Management, Ltd. | 6.4M | 2.9% |
| AMERIPRISE FINANCIAL INC | 6.2M | 2.8% |
| Orbis Allan Gray Ltd | 6.1M | 2.7% |
| STATE STREET CORP | 6.1M | 2.7% |
| D. E. Shaw & Co., Inc. | 5.9M | 2.6% |
| Artisan Partners Limited Partnership | 5.4M | 2.4% |
| RTW INVESTMENTS, LP | 4.8M | 2.2% |
| GEODE CAPITAL MANAGEMENT, LLC | 4.2M | 1.9% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 3.4M | 1.5% |
| NORGES BANK | 3.4M | 1.5% |
| Jupiter Topco LLC | 2.6M | 1.2% |
| UBS Group AG | 2.6M | 1.2% |
| CITADEL ADVISORS LLC | 2.6M | 1.1% |
| FRANKLIN RESOURCES INC | 2.3M | 1.0% |
| MAVERICK CAPITAL LTD | 2.2M | 1.0% |
| MILLENNIUM MANAGEMENT LLC | 2.0M | 0.9% |
| Qube Research & Technologies Ltd | 1.7M | 0.8% |
| WESTFIELD CAPITAL MANAGEMENT CO LP | 1.6M | 0.7% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| JPMORGAN CHASE & CO | Reduced | 24.2M | 10.4M | -13.7M |
| Darwin Global Management, Ltd. | Reduced | 16.8M | 6.4M | -10.4M |
| Invesco Ltd. | Reduced | 6.5M | 368.3K | -6.1M |
| Orbis Allan Gray Ltd | Increased | 1.9M | 6.1M | +4.2M |
| AMERIPRISE FINANCIAL INC | Increased | 3.1M | 6.2M | +3.1M |
| FMR LLC | Increased | 13.2M | 16.1M | +3.0M |
| Capital International Investors | Increased | 5.6M | 8.2M | +2.6M |
| MAVERICK CAPITAL LTD | New | 0 | 2.2M | +2.2M |
| T. Rowe Price Investment Management, Inc. | New | 0 | 1.6M | +1.6M |
| Qube Research & Technologies Ltd | Increased | 148.5K | 1.7M | +1.5M |
| Bellevue Group AG | Increased | 10.0K | 1.4M | +1.4M |
| BAKER BROS. ADVISORS LP | Increased | 7.4M | 8.8M | +1.4M |
| Capital World Investors | Sold Out | 1.4M | 0 | -1.4M |
| Balyasny Asset Management L.P. | Increased | 221.7K | 1.3M | +1.1M |
| Artisan Partners Limited Partnership | Reduced | 6.5M | 5.4M | -1.1M |
| NWI MANAGEMENT LP | Reduced | 2.0M | 1.0M | -1.0M |
| TWO SIGMA INVESTMENTS, LP | Increased | 237.0K | 1.2M | +1.0M |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | Reduced | 1.1M | 219.1K | -924.6K |
| MILLENNIUM MANAGEMENT LLC | Increased | 1.2M | 2.0M | +890.2K |
| BlackRock, Inc. | Reduced | 16.7M | 15.8M | -870.2K |
| UBS Group AG | Increased | 1.7M | 2.6M | +847.0K |
| HRT FINANCIAL LP | New | 0 | 709.7K | +709.7K |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | Sold Out | 653.4K | 0 | -653.4K |
| Railway Pension Investments Ltd | New | 0 | 604.7K | +604.7K |
| Squarepoint Ops LLC | Increased | 39.3K | 616.5K | +577.1K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 173.6K | 729.4K | +555.7K |
| FEDERATED HERMES, INC. | Reduced | 538.3K | 130 | -538.1K |
| Point72 Asset Management, L.P. | New | 0 | 537.0K | +537.0K |
| Polar Capital Holdings Plc | Increased | 368.1K | 890.9K | +522.8K |
| STATE STREET CORP | Increased | 5.6M | 6.1M | +500.5K |
| BANK OF AMERICA CORP /DE/ | Reduced | 1.5M | 1.0M | -479.2K |
| GOLDMAN SACHS GROUP INC | Increased | 942.6K | 1.4M | +467.2K |
| LORD, ABBETT & CO. LLC | Sold Out | 397.3K | 0 | -397.3K |
| Long Focus Capital Management, LLC | Increased | 145.0K | 528.0K | +383.0K |
| SEI INVESTMENTS CO | Reduced | 1.4M | 1.0M | -379.9K |
| Davern Capital Partners, LP | Increased | 182.6K | 559.8K | +377.3K |
| Prosight Management, LP | New | 0 | 375.6K | +375.6K |
| CITADEL ADVISORS LLC | Increased | 2.2M | 2.6M | +374.4K |
| Assenagon Asset Management S.A. | Increased | 63.3K | 436.5K | +373.3K |
| Hood River Capital Management LLC | Increased | 688.6K | 1.1M | +368.3K |
| FRANKLIN RESOURCES INC | Reduced | 2.6M | 2.3M | -344.0K |
| WELLS FARGO & COMPANY/MN | Reduced | 597.4K | 259.9K | -337.5K |
| FRONTIER CAPITAL MANAGEMENT CO LLC | Increased | 469.6K | 795.2K | +325.7K |
| Amundi | Reduced | 805.0K | 487.5K | -317.5K |
| SAMLYN CAPITAL, LLC | Increased | 417.2K | 732.6K | +315.4K |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 3.1M | 3.4M | +312.5K |
| Aberdeen Group plc | Increased | 277.0K | 577.4K | +300.4K |
| JENNISON ASSOCIATES LLC | Increased | 604.7K | 905.1K | +300.4K |
| Nearwater Capital Markets, Ltd | Sold Out | 300.0K | 0 | -300.0K |
| National Pension Service | Reduced | 311.9K | 26.7K | -285.2K |
| Castle Hook Partners LP | Reduced | 1.3M | 993.3K | -276.4K |
| ProShare Advisors LLC | Reduced | 283.1K | 7.1K | -276.0K |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | Reduced | 902.7K | 629.8K | -272.8K |
| Duquesne Family Office LLC | Increased | 1.2M | 1.4M | +270.6K |
| Allspring Global Investments Holdings, LLC | Reduced | 282.7K | 21.1K | -261.6K |
| D. E. Shaw & Co., Inc. | Increased | 5.6M | 5.9M | +252.1K |
| Vestal Point Capital, LP | New | 0 | 250.0K | +250.0K |
| AXIOM INVESTORS LLC /DE | Sold Out | 239.4K | 0 | -239.4K |
| Caption Management, LLC | New | 0 | 236.0K | +236.0K |
| Evergreen Quality Fund GP, Ltd. | Sold Out | 232.5K | 0 | -232.5K |
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.