SION · smart money activity

Who's buying Sionna Therapeutics, Inc.?

Perceptive Advisors: added +37% to 905.0K sh (~$39.8M, 0.6% of book).

Smart money score8#369 of 372 stocks

Latest filingAug 14, 2026

Independent buyers1

Signal sources13F

Signals against1

SION insider buying, 13F and 13D filings

Aug 14, 202613F add

Perceptive Advisors: Added +37% to 905.0K sh (~$39.8M, 0.6% of book)

13F for the quarter ended 2026-06-30. Filed 2026-08-14.
View the filing on SEC EDGAR ↗
Aug 14, 2026Selling

Deerfield Management: Cut -30% to 680.9K sh

13F for the quarter ended 2026-06-30. Filed 2026-08-14.
View the filing on SEC EDGAR ↗

Signals come from SEC filings: Form 4 (insiders, filed within 2 business days), 13F (fund holdings, up to 45 days after quarter end) and Schedule 13D (5%+ activist stakes). This page reports what the filings show; it is not investment advice.