SION insider trading — Sionna Therapeutics, Inc.
Over the last 90 days, insiders at Sionna Therapeutics, Inc. (SION) made 0 open-market purchases worth $0 and 1 open-market sale worth $21.84M, making them net sellers by $21.84M. The largest sale was by Ra Capital Management, L.P., Ra Capital Healthcare Fund Lp, Ra Capital Nexus Fund, L.P., Ra Capital Nexus Fund Iii, L.P., Kolchinsky Peter, Shah Rajeev M. (Director), who sold 3,448,811 shares for $21.84M on Sep 17, 2026.
Updated Oct 16, 2026.
Recent SION insider transactions
Every Form 4 filed by Sionna Therapeutics, Inc. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Sep 17, 2026 | Ra Capital Management, L.P., Ra Capital Healthcare Fund Lp, Ra Capital Nexus Fund, L.P., Ra Capital Nexus Fund Iii, L.P., Kolchinsky Peter, Shah Rajeev M. | Director | S · Sale | Indirect | 3,448,811 | $6.33 | $21.84M | Form 4 |
| Sep 17, 2026 | Ridloff Elena | CFO and CBO | A · Grant/award | Direct | 94,537 | — | — | Form 4 |
| Sep 17, 2026 | Mckee Charlotte | CMO and Head of R&D | A · Grant/award | Direct | 100,000 | — | — | Form 4 |
| Sep 17, 2026 | Fitzpatrick Jennifer | CLO and Head of Program Mgmt. | A · Grant/award | Direct | 56,265 | — | — | Form 4 |
| Sep 17, 2026 | Cloonan Michael | President & CEO | A · Grant/award | Direct | 218,050 | — | — | Form 4 |
SION insider trading FAQ
Are insiders buying SION stock?
Not on the open market. In the last 90 days, Sionna Therapeutics, Inc. insiders made no open-market purchases, and 1 open-market sale totaling $21.84M. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading SION?
Recent sellers: Ra Capital Management, L.P., Ra Capital Healthcare Fund Lp, Ra Capital Nexus Fund, L.P., Ra Capital Nexus Fund Iii, L.P., Kolchinsky Peter, Shah Rajeev M..
Where does SION insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.