Disc Medicine
IRON · NASDAQ
$79.48+$0.55 (+0.70%)TodayMarket closed ·
Prev close $78.93
Who owns IRON
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 53.9% of IRON’s shares.
- Fidelity Management & Research Company LLC7.5%
- Access Industries, Inc.7.4%
- RA Capital Management, LP6.4%
- BlackRock Institutional Trust Company, N.A.5.8%
- Next 6 largest institutions26.8%
- All other shareholders46.1%
| Holder | Shares | % of shares |
|---|---|---|
| Fidelity Management & Research Company LLC | 2.87M | 7.51% |
| Access Industries, Inc. | 2.81M | 7.37% |
| RA Capital Management, LP | 2.45M | 6.41% |
| BlackRock Institutional Trust Company, N.A. | 2.21M | 5.78% |
| Fidelity Institutional Asset Management | 1.96M | 5.12% |
| T. Rowe Price Associates, Inc. | 1.83M | 4.79% |
| Wellington Management Company, LLP | 1.74M | 4.56% |
| State Street Investment Management (US) | 1.65M | 4.32% |
| Vestal Point Capital, LP | 1.55M | 4.06% |
| Atlas Venture | 1.51M | 3.96% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Fidelity Strategic Advisers Fidelity US Total Stk | 1.91M | 5.01% |
| State Street SPDR S&P Biotech ETF | 1.01M | 2.64% |
| Vanguard Total Stock Market Index Fund | 976.78K | 2.56% |
| JPMorgan Mid Cap Growth Fund | 829.14K | 2.17% |
| iShares Russell 2000 ETF | 736.42K | 1.93% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $16.34M (34 trades) of IRON on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Quisel John D | Option exercise | 36.00K | — |
| Quisel John D | Option exercise | 36.00K | $36.36K |
| Bitterman Kevin | Option exercise | 10.00K | — |
| Bitterman Kevin | Option exercise | 10.00K | — |
| Bitterman Kevin | Option exercise | 7.14K | — |
| Bitterman Kevin | Sale | 27.14K | $1.90M |
| Bitterman Kevin | Option exercise | 10.00K | $508.60K |
| Bitterman Kevin | Option exercise | 10.00K | $388.50K |
| Bitterman Kevin | Option exercise | 7.14K | $326.04K |
| Bitterman Kevin | Sale | 18 | $1.44K |
Short interest
Settled Sep 30, 2026
- Shares short
- 7.27M
- Days to cover
- 12.79
- % of shares outstanding
- 19.03%
- Average daily volume
- 568.32K
- Change since last report
- +0.9%
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