COGT — Cogent Biosciences Inc

Ownership history in Siren, L.L.C.  ·  3 quarters on record

This page tracks every 13F SEC filing in which Siren, L.L.C. reported a position in Cogent Biosciences Inc (COGT). 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
1.73% (2025 Q4)
Avg. % of fund
1.0%
First filed
2025 Q2
Last filed
2025 Q4
Quarters held
3
Quarter Action Shares Change Chg % % of Fund Mkt Value Price (EOQ)
2025 Q4 REDUCED 1,629,279 -95,000 -5.5% 1.73% $57.9M $35.52
2025 Q3 ADDED 1,724,279 +869,900 +101.8% 0.97% $24.8M $14.36
2025 Q2 INITIATED 854,379 — — 0.32% $6.1M $7.18
% of Fund (quarterly)    COGT price (monthly, adj. close)

Other funds also holding COGT

As of 2025 Q4 — sorted by position size

Fairmount Funds Management LLC 3Y 24.34% Kynam Capital Management, LP 3Y 13.99% Elmind Capital, LP 12.27% Octagon Capital Advisors LP 3Y 10.13% Saturn V Capital Management LP 3Y 7.93% SUPERSTRING CAPITAL MANAGEMENT LP 6.96% TCG Crossover Management, LLC 3Y 6.9% SILVERARC CAPITAL MANAGEMENT, LLC 3Y 6.14% Vivo Capital, LLC 3Y 7Y 5.51% Commodore Capital LP 3Y 5.19%
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