Disc Medicine
IRON
151 hedge funds and large institutions have $1.8B invested in Disc Medicine in 2025 Q2 according to their latest regulatory filings, with 26 funds opening new positions, 69 increasing their positions, 36 reducing their positions, and 31 closing their positions.
2,002% more call options, than puts
Call options by funds: $23.4M | Put options by funds: $1.11M
92% more repeat investments, than reductions
Existing positions increased: 69 | Existing positions reduced: 36
13% more funds holding in top 10
Funds holding in top 10: 8 → 9 (+1)
9% more capital invested
Capital invested by funds: $1.65B → $1.8B (+$155M)
2.46% more ownership
Funds ownership: 95.9% → 98.37% (+2.5%)
4% less funds holding
Funds holding: 157 → 151 (-6)
16% less first-time investments, than exits
New positions opened: 26 | Existing positions closed: 31
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
WP
Woodline Partners
San Francisco,
California
|
+$17.1M |
| 2 |
LGM
Logos Global Management
San Francisco,
California
|
+$14.4M |
| 3 |
FTM
First Turn Management
Del Mar,
California
|
+$14.1M |
| 4 |
BBA
Baker Bros. Advisors
New York
|
+$12.2M |
| 5 |
SCM
Sio Capital Management
New York
|
+$9.92M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Wellington Management Group
Boston,
Massachusetts
|
-$42.8M |
| 2 |
BCLSI
Bain Capital Life Sciences Investors
Boston,
Massachusetts
|
-$18.8M |
| 3 |
SCM
Silverarc Capital Management
Boston,
Massachusetts
|
-$11.7M |
| 4 |
D.E. Shaw & Co
New York
|
-$10.9M |
| 5 |
PA
Perceptive Advisors
New York
|
-$7.45M |
IRON Hedge Fund Activity: Q2 2025 in Review
151 of the 7,595 institutional investors tracked by Wall St. Rank reported a position in Disc Medicine (IRON) for Q2 2025, worth a combined $1.8B — up 9.4% from $1.65B a quarter earlier.
Sellers outnumbered buyers: 31 funds closed out of IRON and 26 opened new positions — a net loss of 5 holders — while 36 trimmed existing stakes and 69 added.
The largest buyer was Woodline Partners, adding an estimated $17.1M. The largest seller was Wellington Management Group, cutting an estimated $42.8M.
- 151 institutional investors held Disc Medicine (IRON) as of Q2 2025, down from 157 in Q1 2025.
- Funds reported $1.8B of Disc Medicine stock for Q2 2025, up 9.4% quarter-over-quarter.
- 26 funds opened new Disc Medicine positions in Q2 2025 and 31 closed out, a net change of -5 holders.
- The largest Disc Medicine buyer in Q2 2025 was Woodline Partners, an estimated $17.1M added.
- The largest Disc Medicine seller in Q2 2025 was Wellington Management Group, an estimated $42.8M sold.
Based on aggregated 13F filings for Q2 2025.