KRRO — Korro Bio Inc

Ownership history in Siren, L.L.C.  ·  6 quarters on record

This page tracks every 13F SEC filing in which Siren, L.L.C. reported a position in Korro Bio Inc (KRRO). 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
0.78% (2025 Q3)
Avg. % of fund
0.49%
First filed
2024 Q3
Last filed
2025 Q4
Quarters held
6
Quarter Action Shares Change Chg % % of Fund Mkt Value Price (EOQ)
2025 Q4 REDUCED 347,718 -71,115 -17.0% 0.08% $2.8M $8.01
2025 Q3 UNCHANGED 418,833 — 0% 0.78% $20.1M $47.89
2025 Q2 UNCHANGED 418,833 — 0% 0.27% $5.2M $12.49
2025 Q1 UNCHANGED 418,833 — 0% 0.42% $7.3M $17.41
2 older quarters hidden  —  Sign in free or upgrade to Premium to see full history
% of Fund (quarterly)    KRRO price (monthly, adj. close)

Other funds also holding KRRO

As of 2025 Q4 — sorted by position size

72 Investment Holdings, LLC 3Y 4.38% Lynx1 Capital Management LP 3Y 1.1% Atlas Venture Life Science Advisors, LLC 3Y 1.05% NEA Management Company, LLC 3Y 7Y 0.45% AIHC Capital Management Ltd 0.23% Nantahala Capital Management, LLC 3Y 7Y 0.16% TCG Crossover Management, LLC 3Y 0.11% F/m Investments LLC 3Y 0.02% XTX Topco Ltd 3Y 0.01% Graham Capital Management, L.P. 3Y 7Y 0.01%
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