As of November 6, 2026, Disc Medicine, Inc. is a publicly traded company (Nasdaq: IRON). The largest holder reporting an active stake on Schedule 13D is AI Dmi LLC (an Access Industries fund, per the filing), at 6.6%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Passive holders reporting on Schedule 13G include Fidelity (FMR) (12.8%), RA Capital (5.9%) (Schedule 13D/A, October 26, 2026).
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Is Disc Medicine, Inc. a real, registered company?
- Disc Medicine, Inc. files with the SEC under CIK 1816736 (its SEC filings).
- Its shares are listed under the ticker IRON on Nasdaq (SEC company record).
- business address in Watertown, Massachusetts, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under DISC MEDICINE, INC. in our court records and SEC 8-K records (as of 2026-11-06).
- Layoffs: 1 exit or restructuring plan reported on Form 8-K, Item 2.05 (latest filed 2026-02-27).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names AI Dmi LLC (filed 2026-10-26).
Who are Disc Medicine, Inc.'s owners and officers?
Disc Medicine, Inc.: business address in Watertown, Massachusetts; industry Pharmaceutical Preparations (Schedule 13D/A, 2026-10-26).
| Report | Holder | Share |
|---|---|---|
| Schedule 13D/A, 2026-10-26 | Ai Dmi LLC | 6.6% |
| Schedule 13G/A, 2026-08-06 | Fmr LLC | 12.8% |
| Schedule 13G, 2026-01-07 | Ra Capital Management, L.P. | 5.9% |
| Schedule 13D/A, 2025-12-17 | Atlas Venture Fund X, L.P. | 2.2% |
| Schedule 13G/A, 2025-11-05 | Fmr LLC | 14.1% |
| Schedule 13D/A, 2025-10-22 | Ai Dmi LLC | 8% |
| Schedule 13D/A, 2025-08-15 | Atlas Venture Fund X, L.P. | 3.1% |
| Schedule 13G/A, 2025-08-14 | Frazier Life Sciences Public Fund, L.P. | 3% |
| Schedule 13G/A, 2025-08-12 | Wellington Management Group LLP | 4.1% |
| Schedule 13G/A, 2025-08-07 | Fmr LLC | 12.2% |
Questions about who owns Disc Medicine, Inc.
Who owns Disc Medicine, Inc.?
On this page, 3 holders' latest ownership filings report 5% or more of Disc Medicine, Inc.: Fmr LLC (12.8%, Schedule 13G/A, filed 2026-08-06), Ai Dmi LLC (6.6%, Schedule 13D/A, filed 2026-10-26) and Ra Capital Management, L.P. (5.9%, Schedule 13G, filed 2026-01-07).
Who are the largest shareholders of Disc Medicine, Inc.?
By the share each holder's latest filing reports, the largest holders of Disc Medicine, Inc. on this page are Fmr LLC (12.8%), Ai Dmi LLC (6.6%) and Ra Capital Management, L.P. (5.9%).
When did Fmr LLC buy into Disc Medicine, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Fmr LLC on this page is the Schedule 13G/A, filed 2025-08-07, reporting 12.2%; its latest, Schedule 13G/A filed 2026-08-06, reports 12.8%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 10 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Which insiders own Disc Medicine, Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- Access Industries Holdings LLC, a 10% owner: 2,814,379 shares (6.2% of shares outstanding), on a joint filing (Form 4, 2025-10-24).
- , a 10% owner: 2,814,379 shares (6.2% of shares outstanding), on a joint filing (Form 4, 2025-10-24).
- Access Industries Management, LLC, a 10% owner: 2,814,379 shares (6.2% of shares outstanding), on a joint filing (Form 4, 2025-10-24).
- AI Dmi LLC, a 10% owner: 2,814,379 shares (6.2% of shares outstanding), on a joint filing (Form 4, 2025-10-24).
- , the chief executive and a director: 262,064 shares (0.58% of shares outstanding) (Form 4, 2026-09-16).
Shares outstanding: 45,540,842 as of 2026-10-29, from the company's latest SEC cover page.
How much has Disc Medicine, Inc. raised?
No fundraising or offering filing from Disc Medicine, Inc. is on file with us.
Red flags found
1 exit or restructuring plan on Form 8-K (latest Form 8-K, 2026-02-27).
Keep reading
More on Disc Medicine, Inc. and the records around it.
Disc Medicine, Inc. elsewhere on the record
- 5%+ stake filings Oct 2026
- Layoff notices Feb 2026
Companies that share a holder
- Atlas Venture Fund X, L.P. also filed stake reports on 5 other companies: Kymera Therapeutics, Inc. (Aug 2026), Obsidian Therapeutics, Inc. (Aug 2026), Q32 Bio Inc. (May 2026)
- Frazier Life Sciences Public Fund, L.P. also filed stake reports on 25 other companies: PHATHOM PHARMACEUTICALS, INC. (Nov 2026), Q32 Bio Inc. (Oct 2026), ACLARIS THERAPEUTICS, INC. (Sep 2026)
- RA Capital Management, L.P. also filed stake reports on 100 other companies: Climb Bio, Inc. (Nov 2026), Bambusa Therapeutics, Inc. (Nov 2026), SOLID BIOSCIENCES INC. (Nov 2026)
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