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Of the 12 tracked institutions holding IRON, 4 have a 3-year clone track record — 4 of them beat the S&P. Average holder's clone alpha: +3.8pt. It's a gauge of who owns the name, not just how many.
Among the 12 tracked institutional investors we monitor, IRON (DISC MEDICINE INC) is held with a combined value of $1.33B across 17,980,940 shares. The largest holder is FMR LLC with a position worth $357.98M (0.02% of their portfolio). 6 funds increased their holdings. 4 funds reduced their position.
Total Institutional Value
$1.33B
Total Shares Held
17,980,940
Institutional Holders
12
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | FMR LLC | $357.98M | 0.02% | -12.4% |
| 2 | BlackRock, Inc. | $180.50M | 0.00% | +8.5% |
| 3 | RA CAPITAL MANAGEMENT, L.P. | $179.21M | 1.56% | - |
| 4 | VANGUARD GROUP INC | $140.37M | 0.00% | +22.1% |
| 5 | PRICE T ROWE ASSOCIATES INC /MD/ | $137.17M | 0.01% | +21.0% |
| 6 | WELLINGTON MANAGEMENT GROUP LLP | $127.36M | 0.02% | +0.3% |
| 7 | STATE STREET CORP | $120.60M | 0.00% | -2.9% |
| 8 | ARMISTICE CAPITAL, LLC | $33.64M | 0.93% | -14.2% |
| 9 | BAKER BROS. ADVISORS LP | $25.57M | 0.13% | - |
| 10 | CITADEL ADVISORS LLC | $15.31M | 0.01% | +113.7% |
SEC Schedule 13D (activist) and 13G (passive) filings for IRON. Filed when an investor acquires 5%+ ownership.
As of the latest SEC 13F filings, FMR LLC is the largest institutional holder of IRON with a position worth $357.98M, representing 0.02% of their portfolio. In total, 12 institutional investors hold IRON with a combined value of $1.33B.
Institutional investors hold $1.33B worth of IRON stock across 12 positions. The largest institutional holder is FMR LLC with $357.98M in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For IRON, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their IRON positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
Last Close
$64.51
2026-10-02
YTD
-18.4%
22% of 52-week range
