IRON Disc Medicine, Inc.
Disc Medicine, Inc. (IRON) Institutional Ownership
What the institutions did with IRON 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 | 4.9M | 11.3% |
| BlackRock, Inc. | 2.5M | 5.7% |
| RA CAPITAL MANAGEMENT, L.P. | 2.5M | 5.7% |
| JPMORGAN CHASE & CO | 1.9M | 4.3% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1.9M | 4.3% |
| WELLINGTON MANAGEMENT GROUP LLP | 1.7M | 4.0% |
| STATE STREET CORP | 1.6M | 3.8% |
| Vestal Point Capital, LP | 1.6M | 3.6% |
| Atlas Venture Life Science Advisors, LLC | 1.5M | 3.5% |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.4M | 3.2% |
| Frazier Life Sciences Management, L.P. | 1.4M | 3.1% |
| TCG Crossover Management, LLC | 1.3M | 3.1% |
| BVF INC/IL | 1.2M | 2.7% |
| Woodline Partners LP | 958.3K | 2.2% |
| Siren, L.L.C. | 888.4K | 2.1% |
| Logos Global Management LP | 875.0K | 2.0% |
| Opaleye Management Inc. | 855.0K | 2.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 789.7K | 1.8% |
| Assenagon Asset Management S.A. | 768.3K | 1.8% |
| DEERFIELD MANAGEMENT COMPANY, L.P. | 657.0K | 1.5% |
| DIMENSIONAL FUND ADVISORS LP | 569.0K | 1.3% |
| Bellevue Group AG | 560.0K | 1.3% |
| Saturn V Capital Management LP | 524.7K | 1.2% |
| ARMISTICE CAPITAL, LLC | 460.0K | 1.1% |
| JENNISON ASSOCIATES LLC | 439.5K | 1.0% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| Vestal Point Capital, LP | Increased | 700.0K | 1.6M | +850.0K |
| ORBIMED ADVISORS LLC | Reduced | 1.1M | 357.5K | -710.0K |
| FMR LLC | Reduced | 5.6M | 4.9M | -692.4K |
| GOLDMAN SACHS GROUP INC | Reduced | 639.8K | 97.4K | -542.5K |
| JPMORGAN CHASE & CO | Increased | 1.4M | 1.9M | +504.3K |
| Opaleye Management Inc. | Increased | 421.0K | 855.0K | +434.0K |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 1.5M | 1.9M | +326.0K |
| Logos Global Management LP | Increased | 560.0K | 875.0K | +315.0K |
| Assenagon Asset Management S.A. | Increased | 546.2K | 768.3K | +222.1K |
| BlackRock, Inc. | Increased | 2.3M | 2.5M | +194.1K |
| DIMENSIONAL FUND ADVISORS LP | Increased | 394.4K | 569.0K | +174.6K |
| JENNISON ASSOCIATES LLC | Reduced | 610.4K | 439.5K | -170.9K |
| Integral Health Asset Management, LLC | Sold Out | 170.0K | 0 | -170.0K |
| TWO SIGMA INVESTMENTS, LP | New | 0 | 136.8K | +136.8K |
| BVF INC/IL | Reduced | 1.3M | 1.2M | -118.7K |
| SILVERARC CAPITAL MANAGEMENT, LLC | Reduced | 196.0K | 82.8K | -113.2K |
| CITADEL ADVISORS LLC | Increased | 97.9K | 209.3K | +111.4K |
| Trexquant Investment LP | New | 0 | 107.7K | +107.7K |
| Bellevue Group AG | Increased | 459.3K | 560.0K | +100.7K |
| Siren, L.L.C. | Reduced | 988.4K | 888.4K | -100.0K |
| HRT FINANCIAL LP | New | 0 | 90.8K | +90.8K |
| ARMISTICE CAPITAL, LLC | Reduced | 536.0K | 460.0K | -76.0K |
| Saturn V Capital Management LP | Increased | 449.9K | 524.7K | +74.8K |
| Ensign Peak Advisors, Inc | Reduced | 191.5K | 122.1K | -69.4K |
| Freestone Grove Partners LP | Sold Out | 68.7K | 0 | -68.7K |
| Sofinnova Investments, Inc. | Increased | 78.3K | 146.2K | +67.9K |
| Sio Capital Management, LLC | Sold Out | 65.2K | 0 | -65.2K |
| LOOMIS SAYLES & CO L P | Increased | 317.2K | 381.9K | +64.6K |
| Atle Fund Management AB | Reduced | 107.3K | 43.7K | -63.6K |
| Aberdeen Group plc | Increased | 375.6K | 438.2K | +62.6K |
| BNP PARIBAS FINANCIAL MARKETS | Increased | 127.7K | 184.7K | +57.0K |
| ExodusPoint Capital Management, LP | New | 0 | 51.6K | +51.6K |
| STATE STREET CORP | Reduced | 1.7M | 1.6M | -49.4K |
| Jump Financial, LLC | Reduced | 81.8K | 32.5K | -49.3K |
| Checkpoint Capital L.P. | Reduced | 286.7K | 240.1K | -46.5K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 744.2K | 789.7K | +45.5K |
| Squarepoint Ops LLC | Increased | 31.7K | 75.9K | +44.2K |
| Quadrature Capital Ltd | New | 0 | 42.4K | +42.4K |
| Catalio Capital Management, LP | Increased | 123.0K | 159.4K | +36.4K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 247.3K | 281.9K | +34.6K |
| MARSHALL WACE, LLP | New | 0 | 34.4K | +34.4K |
| RAYMOND JAMES FINANCIAL INC | Increased | 44.7K | 78.0K | +33.3K |
| RENAISSANCE TECHNOLOGIES LLC | Sold Out | 31.8K | 0 | -31.8K |
| BANK OF AMERICA CORP /DE/ | Reduced | 166.8K | 135.1K | -31.7K |
| CITIGROUP INC | Increased | 7.7K | 38.3K | +30.6K |
| ALGERT GLOBAL LLC | Increased | 22.7K | 51.9K | +29.2K |
| Rafferty Asset Management, LLC | Reduced | 53.9K | 26.6K | -27.3K |
| Y-Intercept (Hong Kong) Ltd | New | 0 | 26.9K | +26.9K |
| Nantahala Capital Management, LLC | Sold Out | 25.7K | 0 | -25.7K |
| Campbell & CO Investment Adviser LLC | New | 0 | 25.6K | +25.6K |
| DNB Asset Management AS | Reduced | 96.8K | 73.1K | -23.6K |
| MILLENNIUM MANAGEMENT LLC | Increased | 83.3K | 106.2K | +23.0K |
| XTX Topco Ltd | Increased | 34.4K | 56.7K | +22.3K |
| BOOTHBAY FUND MANAGEMENT, LLC | Sold Out | 21.4K | 0 | -21.4K |
| NORTHERN TRUST CORP | Increased | 247.2K | 265.0K | +17.8K |
| Brevan Howard Capital Management LP | Increased | 32.4K | 50.0K | +17.6K |
| Zimmer Partners, LP | Sold Out | 16.7K | 0 | -16.7K |
| GSA CAPITAL PARTNERS LLP | New | 0 | 16.3K | +16.3K |
| JANE STREET GROUP, LLC | New | 0 | 16.0K | +16.0K |
| Palo Alto Investors LP | Increased | 401.7K | 416.6K | +14.9K |
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.