SION — Sionna Therapeutics 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 Sionna Therapeutics Inc (SION). 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
0.37% (2025 Q3)
Avg. % of fund
0.31%
First filed
2025 Q1
Last filed
2025 Q4
Quarters held
4
Quarter Action Shares Change Chg % % of Fund Mkt Value Price (EOQ)
2025 Q4 REDUCED 300,000 -25,000 -7.7% 0.37% $12.3M $41.14
2025 Q3 UNCHANGED 325,000 — 0% 0.37% $9.6M $29.41
2025 Q2 UNCHANGED 325,000 — 0% 0.29% $5.6M $17.35
2025 Q1 INITIATED 325,000 — — 0.19% $3.4M $10.46
% of Fund (quarterly)    SION price (monthly, adj. close)

Other funds also holding SION

As of 2025 Q4 — sorted by position size

Atlas Venture Life Science Advisors, LLC 3Y 14.24% TPG GP A, LLC 3Y 10.33% RA CAPITAL MANAGEMENT, L.P. 3Y 7Y 4.17% SUPERSTRING CAPITAL MANAGEMENT LP 3.98% ORBIMED ADVISORS LLC 3Y 7Y 2.99% PERCEPTIVE ADVISORS LLC 3Y 7Y 0.86% Artia Global Partners LP 3Y 0.7% DEERFIELD MANAGEMENT COMPANY, L.P. 3Y 7Y 0.51% EVENTIDE ASSET MANAGEMENT, LLC 3Y 7Y 0.41% Soleus Capital Management, L.P. 3Y 0.41%
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