IRON Disc Medicine, Inc.
Disc Medicine, Inc. (IRON) Hedge Fund Activity
This view isolates hedge funds from the broader institutional ownership shown on the Institutional tab. A pension fund tracking an index may have no view on a stock; when a hedge fund builds or exits a position, that decision can carry information. This page measures those changes. Positions as of June 30, 2026.
Based on quarterly 13F long-equity filings. Changes compare reported quarter-end positions; filings can be reported up to 45 days later and do not represent a fund's complete exposure.
Most significant moves
Ranked by conviction, not size — how much of the fund's own book the position represents, how far it moved, and what kind of fund made it.
| Fund | Action | Shares changed | Change | Est. value | Portfolio wt. | Score |
|---|---|---|---|---|---|---|
| Vestal Point Capital Growth Healthcare | Increased | +850.0K | +121.4% | $62.2M | 2.6% | 72 |
| Integral Health Asset Management Growth Healthcare | Sold Out | -170.0K | -100.0% | $12.4M | 0.0% | 63 |
| TWO SIGMA INVESTMENTS, LP Quant | New | +136.8K | — | $10.0M | 0.0% | 61 |
| RENAISSANCE TECHNOLOGIES LLC Quant | Sold Out | -31.8K | -100.0% | $2.3M | 0.0% | 60 |
| MARSHALL WACE, LLP Long/Short | New | +34.4K | — | $2.5M | 0.0% | 58 |
| D. E. Shaw & Co., Inc. Quant | New | +6.0K | — | $440.8K | 0.0% | 58 |
| Logos Global Management Growth Healthcare | Increased | +315.0K | +56.3% | $23.0M | 2.8% | 56 |
| OrbiMed Advisors Growth Healthcare | Reduced | -710.0K | -66.5% | $51.9M | 0.5% | 56 |
| Zimmer Partners Long/Short | Sold Out | -16.7K | -100.0% | $1.2M | 0.0% | 56 |
| Nantahala Capital Management Event Long/Short | Sold Out | -25.7K | -100.0% | $1.9M | 0.0% | 56 |
Most significant buyers
By move score, not size.
- Vestal Point Capital
- TWO SIGMA INVESTMENTS, LP
- MARSHALL WACE, LLP
- D. E. Shaw & Co., Inc.
- Logos Global Management
Most significant sellers
By move score, not size.
- Integral Health Asset Management
- RENAISSANCE TECHNOLOGIES LLC
- OrbiMed Advisors
- Zimmer Partners
- Nantahala Capital Management
Hedge fund positions
| Fund | Tier | Shares | Previous | Change | Change % | Portfolio wt. | Action | Score |
|---|---|---|---|---|---|---|---|---|
| Vestal Point Capital | 1 | 1.6M | 700.0K | +850.0K | +121.4% | 2.6% | Increased | 72 |
| Integral Health Asset Management | 2 | 0 | 170.0K | -170.0K | -100.0% | 0.0% | Sold Out | 63 |
| TWO SIGMA INVESTMENTS, LP | 2 | 136.8K | 0 | +136.8K | — | 0.0% | New | 61 |
| RENAISSANCE TECHNOLOGIES LLC | 1 | 0 | 31.8K | -31.8K | -100.0% | 0.0% | Sold Out | 60 |
| MARSHALL WACE, LLP | 2 | 34.4K | 0 | +34.4K | — | 0.0% | New | 58 |
| D. E. Shaw & Co., Inc. | 1 | 6.0K | 0 | +6.0K | — | 0.0% | New | 58 |
| Logos Global Management | 2 | 875.0K | 560.0K | +315.0K | +56.3% | 2.8% | Increased | 56 |
| OrbiMed Advisors | 2 | 357.5K | 1.1M | -710.0K | -66.5% | 0.5% | Reduced | 56 |
| Zimmer Partners | 2 | 0 | 16.7K | -16.7K | -100.0% | 0.0% | Sold Out | 56 |
| Nantahala Capital Management | 3 | 0 | 25.7K | -25.7K | -100.0% | 0.0% | Sold Out | 56 |
| Qube Research & Technologies Ltd | 2 | 12.8K | 0 | +12.8K | — | 0.0% | New | 55 |
| Ghisallo Capital Management | 2 | 0 | 10.0K | -10.0K | -100.0% | 0.0% | Sold Out | 55 |
| Quadrature Capital | 3 | 42.4K | 0 | +42.4K | — | 0.0% | New | 55 |
| ExodusPoint Capital Management | 3 | 51.6K | 0 | +51.6K | — | 0.0% | New | 54 |
| CITADEL ADVISORS LLC | 1 | 209.3K | 97.9K | +111.4K | +113.7% | 0.0% | Increased | 54 |
| Trexquant Investment | 3 | 107.7K | 0 | +107.7K | — | 0.0% | New | 53 |
| Jain Global | 3 | 3.1K | 0 | +3.1K | — | 0.0% | New | 52 |
| Boothbay Fund Management | 4 | 0 | 21.4K | -21.4K | -100.0% | 0.0% | Sold Out | 51 |
| Squarepoint Ops LLC | 2 | 75.9K | 31.7K | +44.2K | +139.3% | 0.0% | Increased | 51 |
| Y-Intercept | 4 | 26.9K | 0 | +26.9K | — | 0.0% | New | 50 |
| Palo Alto Investors | 2 | 416.6K | 401.7K | +14.9K | +3.7% | 4.4% | Increased | 49 |
| Aquatic Capital Management | 4 | 0 | 693 | -693 | -100.0% | 0.0% | Sold Out | 48 |
| Quantbot Technologies | 4 | 2.1K | 0 | +2.1K | — | 0.0% | New | 45 |
| Biotechnology Value Fund | 1 | 1.2M | 1.3M | -118.7K | -9.3% | 2.2% | Reduced | 44 |
| Engineers Gate | 4 | 19.6K | 9.3K | +10.3K | +110.9% | 0.0% | Increased | 42 |
| MILLENNIUM MANAGEMENT LLC | 2 | 106.2K | 83.3K | +23.0K | +27.6% | 0.0% | Increased | 35 |
| Brevan Howard Capital Management | 3 | 50.0K | 32.4K | +17.6K | +54.3% | 0.1% | Increased | 34 |
| Capstone Investment Advisors | 3 | 3.4K | 6.3K | -2.9K | -46.4% | 0.0% | Reduced | 33 |
| Man Group | 3 | 14.9K | 10.0K | +4.9K | +49.2% | 0.0% | Increased | 33 |
| Armistice Capital | 3 | 460.0K | 536.0K | -76.0K | -14.2% | 0.9% | Reduced | 33 |
| AQR Capital Management | 3 | 9.9K | 14.2K | -4.3K | -30.3% | 0.0% | Reduced | 27 |
| Tudor Investment Corporation | 2 | 28.7K | 31.0K | -2.3K | -7.5% | 0.0% | Reduced | 24 |
| RA Capital Management | 1 | 2.5M | 2.5M | 0 | +0.0% | 1.6% | Unchanged | 33 |
| Woodline Partners LP | 2 | 958.3K | 958.3K | 0 | +0.0% | 0.2% | Unchanged | 19 |
| Deerfield Management | 1 | 657.0K | 657.0K | 0 | +0.0% | 0.6% | Unchanged | 28 |
| Baker Bros. Advisors | 1 | 349.7K | 349.7K | 0 | +0.0% | 0.1% | Unchanged | 26 |
| Alyeska Investment Group, L.P. | 2 | 125.0K | 125.0K | 0 | +0.0% | 0.0% | Unchanged | 20 |
| Moore Capital Management | 3 | 57.8K | 57.8K | 0 | +0.0% | 0.1% | Unchanged | 17 |
| RTW Investments | 1 | 30.0K | 30.0K | 0 | +0.0% | 0.0% | Unchanged | 25 |
Every fund above opens. Subscribers can see any manager's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
Sign in or subscribeHedge funds are identified from their 13F filings, which are due 45 days after quarter end and cover long U.S.-listed equity positions only. A fund's short book never appears, so a reduced position can mean a changed view or a changed hedge — the filing doesn't say which.