Disc Medicine, Inc.
Disc Medicine, Inc. (IRON) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · IRON · as of Sep 30, 2025
Ownership Breakdown
173
Institutional Holders
▲ 20 vs Q2
$2.26B
Total Inst. Value
▲ $454.10M vs Q2
38.20M
Shares Outstanding
freeFloat 72.37%
34.22M
13F Shares Held
▲ 150,846 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
IRON largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
FMR LLC pharmaceutical preparations | 4.94M | 14.09% | 14.09% | $326.12B | Nov 13, 2025 | ▲ 1.69M |
ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC pharmaceutical preparations | 2.14M | 6.12% | 6.12% | $141.58B | Nov 13, 2025 | ▼ 241.8K |
BLACKROCK, INC. pharmaceutical preparations | 2.02M | 5.77% | 5.77% | $133.43B | Nov 12, 2025 | ▼ 25.5K |
RA CAPITAL MANAGEMENT, L.P. pharmaceutical preparations | 1.58M | 4.50% | 4.50% | $104.22B | Nov 14, 2025 | — held |
VANGUARD GROUP INC pharmaceutical preparations | 1.45M | 4.13% | 4.13% | $95.69B | Nov 7, 2025 | ▲ 51.3K |
FRAZIER LIFE SCIENCES MANAGEMENT, L.P. pharmaceutical preparations | 1.44M | 4.11% | 4.11% | $95.06B | Nov 14, 2025 | ▼ 216.3K |
ORBIMED ADVISORS LLC pharmaceutical preparations | 1.42M | 4.04% | 4.04% | $93.50B | Nov 14, 2025 | — held |
WELLINGTON MANAGEMENT GROUP LLP pharmaceutical preparations | 1.41M | 4.03% | 4.03% | $93.18B | Nov 14, 2025 | ▼ 22.0K |
PRICE T ROWE ASSOCIATES INC /MD/ pharmaceutical preparations | 1.33M | 3.79% | 3.79% | $87.65B | Nov 14, 2025 | ▼ 189.2K |
STATE STREET CORP pharmaceutical preparations | 1.05M | 2.99% | 2.99% | $69.09B | Nov 14, 2025 | ▲ 115.8K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
20
Increased
+3.42M shares4
New Positions
first time holders15
Decreased
−3.54M shares0
Sold Out
fully exitedNet shares change (top 50)
116.7K
+3.42M / −3.54M
Net new holders
+9
4 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
IRON insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
0
Buy transactions
4
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Savage William Jacob Chief Medical Officer | Apr 13, 2026 | Sale | 3,531 | $66.12 | $233.5K | 81.7K | Form 4 ↗ |
Savage William Jacob Chief Medical Officer | Apr 13, 2026 | Sale | 2,200 | $66.81 | $147.0K | 79.5K | Form 4 ↗ |
Franchi Jean M. Chief Financial Officer | Apr 13, 2026 | Sale | 400 | $69.00 | $27.6K | 70.6K | Form 4 ↗ |
Franchi Jean M. Chief Financial Officer | Apr 14, 2026 | Sale | 6,257 | $69.24 | $433.2K | 64.3K | Form 4 ↗ |
Savage William Jacob Chief Medical Officer | Mar 2, 2026 | Sale | 4,392 | $65.52 | $287.8K | 88.2K | Form 4 ↗ |
Savage William Jacob Chief Medical Officer | Mar 2, 2026 | Sale | 2,986 | $66.41 | $198.3K | 85.2K | Form 4 ↗ |
Franchi Jean M. Chief Financial Officer | Feb 25, 2026 | Sale | 353 | $69.06 | $24.4K | 71.0K | Form 4 ↗ |
Franchi Jean M. Chief Financial Officer | Feb 17, 2026 | Sale | 4,075 | $62.86 | $256.2K | 78.4K | Form 4 ↗ |
Franchi Jean M. Chief Financial Officer | Feb 18, 2026 | Sale | 3,397 | $65.01 | $220.8K | 75.0K | Form 4 ↗ |
Franchi Jean M. Chief Financial Officer | Feb 18, 2026 | Sale | 3,684 | $65.89 | $242.7K | 71.3K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Disc Medicine, Inc. (IRON) is primarily owned by institutional investors, who hold approximately 89.6% of total shares outstanding. Company insiders own approximately 27.63%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Disc Medicine, Inc. is FMR LLC, holding approximately 4.94 million shares — equal to 14.09% of outstanding shares — as of September 30, 2025.
A total of 173 institutional investors currently hold IRON stock, with a combined institutional value of approximately $2.26 billion as of the most recent 13F filing period.
Frequently asked questions
IRON ownershipDisc Medicine, Inc. (IRON) is primarily owned by institutional investors, who hold approximately 89.6% of shares. The largest shareholder is FMR LLC with a 14.09% stake. Company insiders hold 27.63%. Data sourced from SEC Form 13F as of September 30, 2025.