IRON — Disc Medicine Inc

Ownership history in Siren, L.L.C.  ·  4 quarters on record

This page tracks every 13F SEC filing in which Siren, L.L.C. reported a position in Disc Medicine Inc (IRON). Data includes quarterly share count, position size as % of portfolio, estimated market value, and end-of-quarter stock price — sourced directly from SEC EDGAR 13F filings.

Peak position
3.03% (2025 Q1)
Avg. % of fund
2.69%
First filed
2025 Q1
Last filed
2025 Q4
Quarters held
4
Quarter Action Shares Change Chg % % of Fund Mkt Value Price (EOQ)
2025 Q4 ADDED 988,401 +75,000 +8.2% 2.34% $78.5M $79.41
2025 Q3 REDUCED 913,401 -186,000 -16.9% 2.36% $60.4M $66.08
2025 Q2 ADDED 1,099,401 +27,536 +2.6% 3.01% $58.2M $52.96
2025 Q1 INITIATED 1,071,865 — — 3.03% $53.2M $49.64
% of Fund (quarterly)    IRON price (monthly, adj. close)

Other funds also holding IRON

As of 2025 Q4 — sorted by position size

Foresite Capital Management V, LLC 3Y 14.45% Atlas Venture Life Science Advisors, LLC 3Y 13.9% Checkpoint Capital L.P. 11.24% GREAT POINT PARTNERS LLC 3Y 7Y 6.44% Saturn V Capital Management LP 3Y 4.35% Palo Alto Investors LP 3Y 7Y 3.51% Lion Point Capital, LP 3Y 7Y 3.33% First Light Asset Management, LLC 3Y 7Y 3.18% Frazier Life Sciences Management, L.P. 3Y 2.69% Logos Global Management LP 3Y 2.45%
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