Who owns IRON
203 institutions reported holding IRON for 2026Q1, together 109% of the company, more than the 194 a quarter earlier.
203
Institutions reporting a position · as of 2026Q1 · up from 194 the quarter before
- Shares held by institutions
- 41.9M
Shares held by institutions · 109% of the company · long US equity positions only, as reported on Form 13F
- Reported value
- $2.67B
Reported value · at 2026-03-31 prices, not today's
- Top 5 holders
- 36%
Top 5 holders · of the whole company, between five filers
Details›
- Reporting quarter2026-03-31
- 2026Q1
- Quarters on record
- 14
- New positions
- 41
- Positions exited
- 38
- Added to
- 75
- Reduced
- 42
- Top 10 holdersof the company
- 56%
| Quarter | Filers | Shares | Reported value |
|---|---|---|---|
| 2026Q1 | 203 | 41.9M | $2.67B |
| 2025Q4 | 194 | 38.3M | $3.04B |
| 2025Q3 | 166 | 34.2M | $2.26B |
| 2025Q2 | 149 | 34.1M | $1.80B |
| 2025Q1 | 156 | 33.2M | $1.65B |
| 2024Q4 | 151 | 26.6M | $1.68B |
| 2024Q3 | 131 | 27.4M | $1.35B |
| 2024Q2 | 120 | 27.6M | $1.24B |
| 2024Q1 | 130 | 22.3M | $1.38B |
| 2023Q4 | 112 | 20.2M | $1.17B |
| 2023Q3 | 91 | 19.9M | $934M |
| 2023Q2 | 90 | 19.1M | $849M |
| 2023Q1 | 45 | 14.6M | $310M |
| 2022Q4 | 34 | 11.4M | $216M |
| Holder | Shares | % of company | Value |
|---|---|---|---|
| FMR LLC | 5.6M | 15% | $357M |
| RA CAPITAL MANAGEMENT, L.P. | 2.5M | 6.4% | $157M |
| BlackRock Inc. | 2.3M | 5.9% | $145M |
| VANGUARD GROUP INC | 1.9M | 4.9% | $120M |
| WELLINGTON MANAGEMENT GROUP LLP | 1.7M | 4.5% | $111M |
| STATE STREET CORP | 1.7M | 4.4% | $109M |
| PRICE T ROWE ASSOCIATES INC /MD/ | 1.5M | 4.0% | $99M |
| Atlas Venture Life Science Advisors, LLC | 1.5M | 3.9% | $97M |
| JPMORGAN CHASE & CO | 1.4M | 3.6% | $83M |
| Frazier Life Sciences Management, L.P. | 1.4M | 3.5% | $87M |
SEC Form 13F data sets (DERA bulk files). 13F is quarterly, filed up to 45 days late, and covers long US equity positions only, no shorts, no derivatives, nothing held below the reporting threshold.
reading the register…