Disc Medicine Inc.
Ownership
Ownership Structure
Who owns Disc Medicine Inc. (IRON)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 85.8% of the shares are freely tradable; institutional investors hold 113.7%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| FMR Inc | 14.55 | 5,586,894 | +2.5 | 03/31/2026 |
| RA Capital Management, LLC | 6.38 | 2,450,221 | +24.0 | 03/31/2026 |
| BlackRock Inc | 5.92 | 2,273,831 | -0.1 | 03/31/2026 |
| Wellington Management Company LLP | 4.54 | 1,741,351 | +0.3 | 06/30/2026 |
| State Street Corp | 4.42 | 1,698,244 | +43.0 | 03/31/2026 |
| T. Rowe Price Associates, Inc. | 4.04 | 1,549,350 | -8.8 | 03/31/2026 |
| Atlas Venture Life Science Advisors, LLC | 3.94 | 1,513,875 | +0.0 | 06/30/2026 |
| Vanguard Capital Management, LLC | 3.58 | 1,375,430 | +0.0 | 03/31/2026 |
| JPMorgan Chase & Co | 3.57 | 1,371,480 | -13.3 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Strategic Advisers Fidelity US TtlStk | 4.97 | 1,909,438 | -0.2 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Quisel John D | Chief Executive Officer | 262,064 | 18,134,829 $ | Sep 15, 2026 | direct |
| Yu Jonathan Yen-Wen | Chief Operating Officer | 54,324 | 3,759,221 $ | Aug 25, 2026 | direct |
| Khara Rahul | Chief Legal Officer | 52,324 | 3,620,821 $ | Aug 6, 2026 | direct |
| Bitterman Kevin | Director | 13,427 | 929,148 $ | Sep 4, 2026 | both |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 15, 2026 | Quisel John D | Chief Executive Officer | Other | 36,000 | 1.01 | 36,360 |
| Sep 11, 2026 | Bitterman Kevin | Director | Sell | 27,136 | 70.11 | 1,902,505 |
| Sep 11, 2026 | Bitterman Kevin | Director | Other | 10,000 | 50.86 | 508,600 |
| Sep 11, 2026 | Bitterman Kevin | Director | Other | 7,136 | 45.69 | 326,044 |
| Sep 4, 2026 | Bitterman Kevin | Director | Sell | 18 | 79.96 | 1,439 |
| Sep 4, 2026 | Bitterman Kevin | Director | Sell | 759 | 79.96 | 60,690 |
| Sep 4, 2026 | Bitterman Kevin | Director | Sell | 912 | 79.96 | 72,924 |
| Sep 3, 2026 | Bitterman Kevin | Director | Sell | 54 | 79.98 | 4,319 |
| Sep 3, 2026 | Bitterman Kevin | Director | Sell | 2,339 | 79.98 | 187,073 |
| Sep 3, 2026 | Bitterman Kevin | Director | Sell | 2,810 | 79.98 | 224,744 |
| Sep 2, 2026 | Bitterman Kevin | Director | Sell | 2 | 80.98 | 162 |
| Sep 2, 2026 | Bitterman Kevin | Director | Sell | 9 | 80.98 | 729 |
| Sep 2, 2026 | Bitterman Kevin | Director | Sell | 10 | 80.98 | 810 |
| Sep 2, 2026 | Bitterman Kevin | Director | Sell | 511 | 80.17 | 40,967 |
| Sep 2, 2026 | Bitterman Kevin | Director | Sell | 22,090 | 80.17 | 1,770,955 |
| Sep 2, 2026 | Bitterman Kevin | Director | Sell | 26,542 | 80.17 | 2,127,872 |
| Sep 1, 2026 | Bitterman Kevin | Director | Sell | 1 | 79.95 | 80 |
| Sep 1, 2026 | Bitterman Kevin | Director | Sell | 58 | 79.95 | 4,637 |
| Sep 1, 2026 | Bitterman Kevin | Director | Sell | 70 | 79.95 | 5,597 |
| Aug 25, 2026 | Yu Jonathan Yen-Wen | Chief Operating Officer | Sell | 8,796 | 83.12 | 731,092 |
| Aug 25, 2026 | Yu Jonathan Yen-Wen | Chief Operating Officer | Other | 8,796 | 13.50 | 118,746 |
| Aug 24, 2026 | Yu Jonathan Yen-Wen | Chief Operating Officer | Sell | 300 | 82.53 | 24,760 |
| Aug 24, 2026 | Yu Jonathan Yen-Wen | Chief Operating Officer | Other | 300 | 13.50 | 4,050 |
| Aug 17, 2026 | Quisel John D | Chief Executive Officer | Sell | 11,888 | 79.84 | 949,162 |
| Aug 17, 2026 | Quisel John D | Chief Executive Officer | Sell | 12,712 | 79.20 | 1,006,729 |
| Aug 17, 2026 | Quisel John D | Chief Executive Officer | Sell | 8,400 | 78.11 | 656,091 |
| Aug 17, 2026 | Quisel John D | Chief Executive Officer | Other | 33,000 | 13.50 | 445,500 |
| Aug 12, 2026 | Yu Jonathan Yen-Wen | Chief Operating Officer | Sell | 804 | 82.64 | 66,445 |
| Aug 12, 2026 | Yu Jonathan Yen-Wen | Chief Operating Officer | Other | 804 | 13.50 | 10,854 |
| Aug 6, 2026 | Khara Rahul | Chief Legal Officer | Sell | 5,000 | 80.00 | 400,000 |
| Aug 6, 2026 | Khara Rahul | Chief Legal Officer | Other | 5,000 | 14.69 | 73,450 |
| Jul 13, 2026 | Quisel John D | Chief Executive Officer | Sell | 6,400 | 76.05 | 486,733 |
| Jul 13, 2026 | Quisel John D | Chief Executive Officer | Sell | 16,896 | 74.95 | 1,266,303 |
| Jul 13, 2026 | Quisel John D | Chief Executive Officer | Sell | 9,704 | 74.27 | 720,744 |
| Jul 13, 2026 | Quisel John D | Chief Executive Officer | Other | 7,416 | 13.50 | 100,116 |
| Jul 13, 2026 | Quisel John D | Chief Executive Officer | Other | 25,584 | 9.86 | 252,258 |
| Jul 7, 2026 | Yu Jonathan Yen-Wen | Chief Operating Officer | Sell | 100 | 82.50 | 8,250 |
| Jul 7, 2026 | Yu Jonathan Yen-Wen | Chief Operating Officer | Other | 100 | 13.50 | 1,350 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.