IRON
Disc Medicine, Inc. · Healthcare · Biotechnology
Momentum inputs (comparable managers):
holder breadth +30.0% ·
share flow -13.0% ·
net new positions +20.0%
· formula
Ownership fragmentation: more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q4 2024
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q3 2026 | 1 | 0 | 1.12M | $73.28M | n/a | −1 |
| Q2 2026 | 83 | +7 | 22.99M | $1.68B | +9 | −2 |
| Q1 2026 | 79 | +1 | 22.38M | $1.43B | +7 | −6 |
| Q4 2025 | 77 | -1 | 22.10M | $1.75B | +1 | −2 |
| Q3 2025 | 17 | +3 | 15.61M | $1.03B | +3 | n/a |
| Q2 2025 | 11 | -1 | 11.75M | $622.02M | +1 | −2 |
| Q1 2025 | 9 | -1 | 6.07M | $301.51M | n/a | −1 |
| Q4 2024 | 10 | +3 | 5.16M | $327.26M | +3 | n/a |
| Q3 2024 | 6 | -1 | 5.16M | $253.75M | n/a | −1 |
| Q2 2024 | 7 | n/a | 5.00M | $225.18M | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | Wellington Management ✦ | 1.40M | -24.2% | $88.47M | 0.0% | ▼ Trim | 3 | SEC ↗ ×6 |
| 2 | T. Rowe Price ✦ | 1.39M | +23.2% | $88.42M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 3 | State Street Global Advisors ✦ (passive) | 768.74K | n/a | $48.74M | 0.0% | n/c | 1 | SEC ↗ |
| 4 | Citadel Advisors ✦ | 591.27K | +43.9% | $37.49M | 0.0% | ▲ Add | 3 | SEC ↗ ×2 |
| 5 | Geode Capital Management ✦ (passive) | 472.71K | -0.4% | $29.98M | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
| 6 | Adage Capital Partners ✦ | 350.00K | -36.4% | $22.19M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 7 | Renaissance Technologies ✦ | 86.42K | New | $5.48M | 0.0% | New | 1 | SEC ↗ |
| 8 | D. E. Shaw & Co. ✦ | 81.19K | New | $5.15M | 0.0% | New | 1 | SEC ↗ |
| 9 | Point72 Asset Management ✦ | 13.44K | -98.2% | $852,380 | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 10 | Millennium Management ✦ | 7.88K | New | $499,529 | 0.0% | New | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| Renaissance Technologies | $5.48M | 0.0% |
| D. E. Shaw & Co. | $5.15M | 0.0% |
| Millennium Management | $499,529 | 0.0% |
Exited
| No tracked exits this quarter. |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 203 holders, 40.63M shares, $2.48B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold: shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Director · 266 sh · $21,341
Director · 11.47K sh · $920,238
Director · 13.78K sh · $1.11M
Director · 2.87K sh · $229,377
Director · 55 sh · $4,397
Director · 2.39K sh · $190,921
Director · 5.94K sh · $474,782
Director · 115 sh · $9,197
Director · 4.94K sh · $395,212
Director · 27.14K sh · $1.90M
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology