Disc Medicine, Inc. (IRON) Institutional Ownership

Ownership Summary

Disc Medicine, Inc. (NASDAQ:IRON) has 192 institutional investors with active 13F positions as of December 2025.

• These investors collectively held 103.5% of Disc Medicine's outstanding shares in December 2025, up from 100.1% in September 2025.
• Their total shares held in IRON increased 13.09% quarter over quarter, and separately, investors owning Disc Medicine increased 28.0% from a year ago.
• Among the 192 funds, 125 bought more Disc Medicine shares, 48 sold down, and 19 held their ground.
• Combined, these investors held 36.41Mn shares in IRON for December 2025, up by 4.21Mn shares quarter on quarter, and up 9.56Mn shares year over year.
• As of December 31, 2025, FMR LLC held the largest stake in Disc Medicine with 5.59Mn shares, accounting for 15.88% of total shares outstanding.
• The most significant purchases of IRON for the quarter ending December 2025 came from PRICE T ROWE ASSOCIATES INC /MD/ (1.55Mn), VANGUARD CAPITAL MANAGEMENT LLC (1.38Mn), TCG Crossover Management, LLC (1.34Mn), BVF INC/IL (622.31K), State Street Corp (510.25K).
• Top sellers of IRON stock for the quarter ending December 2025 included Goldman Sachs Group Inc (868.55K), Jpmorgan Chase & Co (209.65K), Checkpoint Capital L.P. (166.33K), Nantahala Capital Management, LLC (107.15K), MILLENNIUM MANAGEMENT LLC (101.52K).
• According to Business Quant data, leading holders of IRON for December 2025 are FMR LLC (5.59Mn), RA CAPITAL MANAGEMENT, L.P. (2.45Mn), BlackRock, Inc. (2.27Mn), WELLINGTON MANAGEMENT GROUP LLP (1.74Mn), State Street Corp (1.7Mn), PRICE T ROWE ASSOCIATES INC /MD/ (1.55Mn), Atlas Venture Life Science Advisors, LLC (1.51Mn), VANGUARD CAPITAL MANAGEMENT LLC (1.38Mn), Jpmorgan Chase & Co (1.37Mn), Frazier Life Sciences Management, L.P. (1.35Mn).