SIONNA THERAPEUTICS INC (SION) Institutional Ownership and Insiders Activity

SIONNA THERAPEUTICS INC (SION) is widely held by institutional investors, with 2 tracked firms reporting positions valued at approximately $129.17M based on SEC Form 13F filings for the quarter ended March 31, 2026.

Viking Global Investors is the largest disclosed holder, reporting approximately $128.09M in SION holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with Viking Global Investors representing the majority of disclosed value.