SIONNA THERAPEUTICS INC (SION) Institutional Ownership Changes & 13F Activity

SIONNA THERAPEUTICS INC (SION). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings. This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Polen Capital Management, Renaissance Technologies LLC, and Viking Global Investors.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Polen Capital ManagementSell-4,48326,775$1,073,410
Q3 2025Polen Capital ManagementBuy14,28331,258$919,298
Q3 2025Renaissance Technologies LLCSell-11,40014,600$429,386
Q2 2025Viking Global InvestorsBuy242,4273,195,181$55,436,390
Q2 2025Renaissance Technologies LLCBuy26,00026,000$451,100
Q2 2025Polen Capital ManagementBuy16,97516,975$294,516
Q1 2025Viking Global InvestorsBuy2,952,7542,952,754$30,885,807

Frequently asked questions about SION activity

  • Which institutional owners are buying SION?

    Institutional owners buying SION include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in SION activity?

    "Buy" means an investor increased their reported position in SION compared to the prior reporting period. This reflects growing exposure to SIONNA THERAPEUTICS INC (SION) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in SION increasing?

    Institutional interest in SION can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

Related SION Institutional Insights