Sionna Therapeutics, Inc. Common Stock

Net selling: insiders sold $21.8M and bought $0 of SION stock on the open market in the 90 days to Oct 31, 2026, according to SEC Form 4 filings. The largest was Ra Capital Nexus Fund III, L.P. (Director), who sold $21.8M. The latest filing was on Sep 21, 2026.

None. No member of Congress disclosed a SION trade with a trade date in the last 180 days, according to House and Senate STOCK Act filings.

This summary uses filings available on Oct 31, 2026. Insiders must report trades to the SEC within 2 business days, members of Congress have up to 45 days to disclose a trade, and funds file 13F holdings up to 45 days after each quarter ends, so the latest moves may not be public yet.