Disc Medicine, Inc.
IRON- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001816736
In the last 90 days, Disc Medicine, Inc. insiders filed 0 open-market purchases and 9 sales; 216 institutions reported holding it in 13F filings for Q2 2026, worth $3.13B in total; no superinvestor holds it.
Holders of 5% or more of IRON
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Disc Medicine, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| FMR LLC | 13G/A | 14.10%4.91M shares | +1.90 ppfrom 12.20% | Feb 12, 20254 filings | Nov 5, 2025 | SEC |
| AI Dmi LLC | 13D/A | 8.00%3.02M shares | −2.80 ppfrom 10.80% | Mar 3, 20252 filings | Oct 22, 2025 | SEC |
| Ra Capital Management, L.P. | 13G | 5.90%2.23M shares | New | Jan 7, 20261 filing | Jan 7, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
16 Schedule 13D and 13G filings on Disc Medicine, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Jan 7, 20264:53 PM ET | Ra Capital Management, L.P.and 3 others | 13G | 5.90%2.23M shares | New | Dec 30, 2025 | SEC |
| Dec 17, 20258:07 PM ET | Atlas Venture Fund X, L.P.and 11 others | 13D/A | 2.20%813.2K shares | −0.90 ppfrom 3.10%Below 5% | Dec 12, 2025 | SEC |
| Nov 5, 202511:30 AM ET | FMR LLCand 1 other | 13G/A | 14.10%4.91M shares | +1.90 ppfrom 12.20% | Sep 30, 2025 | SEC |
| Oct 22, 20259:44 PM ET | AI Dmi LLCand 3 others | 13D/A | 8.00%3.02M shares | −2.80 ppfrom 10.80% | Oct 20, 2025 | SEC |
| Aug 15, 20257:16 PM ET | Atlas Venture Fund X, L.P.and 11 others | 13D/A | 3.10%1.08M shares | –Below 5% | Aug 13, 2025 | SEC |
| Aug 14, 20251:11 PM ET | Frazier Life Sciences Public Fund, L.P.and 16 others | 13G/A | 3.00%1.03M shares | –Below 5% | Jun 30, 2025 | SEC |
| Aug 12, 202510:34 AM ET | Wellington Management Group LLPand 2 others | 13G/A | 4.10%1.43M shares | −2.70 ppfrom 6.80%Below 5% | Jun 30, 2025 | SEC |
| Aug 7, 202510:16 AM ET | FMR LLCand 1 other | 13G/A | 12.20%4.22M shares | +2.90 ppfrom 9.30% | Jul 31, 2025 | SEC |
| May 15, 20254:40 PM ET | Paradigm Biocapital Advisors LPand 3 others | 13G/A | 3.50%1.21M shares | –Below 5% | Mar 31, 2025 | SEC |
| May 12, 202510:44 AM ET | Wellington Management Group LLPand 3 others | 13G | 6.80%2.34M shares | +2.10 ppfrom 4.70% | Mar 31, 2025 | SEC |
| May 12, 202510:28 AM ET | FMR LLCand 1 other | 13G/A | 9.30%3.22M shares | +3.00 ppfrom 6.30% | Mar 31, 2025 | SEC |
| Mar 12, 20257:57 PM ET | OrbiMed Advisors LLCand 3 others | 13D/A | 4.50%1.56M shares | –Below 5% | Mar 10, 2025 | SEC |
| Mar 3, 20254:01 PM ET | AI Dmi LLCand 3 others | 13D/A | 10.80%3.76M shares | – | Feb 27, 2025 | SEC |
| Feb 14, 20257:50 AM ET | Bain Capital Life Sciences Opportunities III, LP | 13G/A | 3.30%983.5K shares | –Below 5% | Dec 31, 2024 | SEC |
| Feb 12, 20259:08 AM ET | FMR LLCand 1 other | 13G | 6.30%1.87M shares | New | Dec 31, 2024 | SEC |
| Feb 10, 202510:25 AM ET | Wellington Management Group LLPand 2 others | 13G/A | 4.70%1.40M shares | –Below 5% | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Disc Medicine, Inc. shares.
No Form 144 notices for Disc Medicine, Inc. are on file.