SIONNA THERAPEUTICS INC (SION) Institutional Ownership and Insiders Activity

SIONNA THERAPEUTICS INC (SION) is widely held by institutional investors, with 142 firms reporting positions valued at approximately $2.10B based on SEC Form 13F filings for the quarter ended June 30, 2026.

Ra Capital Management, L.P. is the largest disclosed holder, reporting approximately $435.72M in SION holdings in its latest filing.

Recent insider activity includes 10 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.