Form4.ai tracks every SEC insider trade in real time. See every SION insider filing with a free account — no card.
See every SION insider filing — free account, no card.
Free accountSionna Therapeutics, Inc. (SION) has 5 SEC Form 4 insider filings on record in the last 90 days. No insider purchases were filed — 1 sales totalling $21.8M. Most recent filing: Sept. 21, 2026.
Open-market value, last 90 days
Form 4 filings by type, last 90 days
| Date | Insider | Trade | Value | Price since buy |
|---|---|---|---|---|
| Sep 21, 2026 SEC filing | RA CAPITAL MANAGEMENT, L.P. Director | Sold | $21,835,018 | — |
| Sep 18, 2026 SEC filing | Ridloff Elena CFO and CBO | Grant / award | — | — |
| Sep 18, 2026 SEC filing | McKee Charlotte CMO and Head of R&D | Grant / award | — | — |
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Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.