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 Mar 31, 2025
Ownership Breakdown
161
Institutional Holders
▲ 3 vs Q4
$1.65B
Total Inst. Value
▼ $34.93M vs Q4
38.20M
Shares Outstanding
freeFloat 72.37%
33.15M
13F Shares Held
▲ 6.58M vs Q4
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
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
FMR LLC pharmaceutical preparations | 3.22M | 9.68% | 9.68% | $160.06B | May 12, 2025 | ▲ 1.36M |
ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC pharmaceutical preparations | 2.38M | 7.16% | 7.16% | $118.36B | May 14, 2025 | ▼ 125.0K |
WELLINGTON MANAGEMENT GROUP LLP pharmaceutical preparations | 2.34M | 7.03% | 7.03% | $116.33B | May 13, 2025 | ▲ 948.1K |
BLACKROCK, INC. pharmaceutical preparations | 2.09M | 6.29% | 6.29% | $103.97B | May 2, 2025 | ▲ 234.8K |
FRAZIER LIFE SCIENCES MANAGEMENT, L.P. pharmaceutical preparations | 1.75M | 5.27% | 5.27% | $87.11B | May 15, 2025 | — held |
RA CAPITAL MANAGEMENT, L.P. pharmaceutical preparations | 1.58M | 4.73% | 4.73% | $78.29B | May 15, 2025 | NEW |
JANUS HENDERSON GROUP PLC pharmaceutical preparations | 1.42M | 4.27% | 4.27% | $74.45B | May 15, 2025 | ▲ 205.4K |
ORBIMED ADVISORS LLC pharmaceutical preparations | 1.42M | 4.25% | 4.25% | $70.24B | May 15, 2025 | ▼ 370.6K |
PRICE T ROWE ASSOCIATES INC /MD/ pharmaceutical preparations | 1.36M | 4.08% | 4.08% | $67.42B | May 14, 2025 | ▼ 36.4K |
VANGUARD GROUP INC pharmaceutical preparations | 1.31M | 3.92% | 3.92% | $64.78B | May 9, 2025 | ▲ 236.8K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
27
Increased
+5.35M shares6
New Positions
first time holders12
Decreased
−984.9K shares0
Sold Out
fully exitedNet shares change (top 50)
+4.37M
+5.35M / −984.9K
Net new holders
+21
6 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 86.8% 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 3.22 million shares — equal to 9.68% of outstanding shares — as of March 31, 2025.
A total of 161 institutional investors currently hold IRON stock, with a combined institutional value of approximately $1.65 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 86.8% of shares. The largest shareholder is FMR LLC with a 9.68% stake. Company insiders hold 27.63%. Data sourced from SEC Form 13F as of March 31, 2025.