Sionna Therapeutics, Inc. (SION) has 9 SEC Form 4 insider filings on record in the last 90 days. No insider purchases were filed — 4 sales totalling $18.3M. Most recent filing: Sept. 18, 2026.
| Date | Insider | Value | Shares | Stake | Pre-planned | Links |
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| Sept. 18, 2026 filed Sept. 17, 2026 | Ridloff Elena CFO and CBO | $0 | 425,417 | — | No | |
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| Sept. 18, 2026 filed Sept. 17, 2026 | McKee Charlotte CMO and Head of R&D | $0 | 411,400 | — | No | |
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| Sept. 18, 2026 filed Sept. 17, 2026 | Fitzpatrick Jennifer CLO and Head of Program Mgmt. | $0 | 262,545 | — | No | |
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| Sept. 18, 2026 filed Sept. 17, 2026 | Cloonan Michael President & CEO | $0 | 1,090,250 | — | No | |
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| July 9, 2026 filed July 7, 2026 | Thompson Peter A. Director | −$3,854,281 | 85,918 | −3% | Yes | |
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Showing the 5 most recent of 9 filings in the last 90 days.
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.
Real-time Telegram alerts the moment a Form 4 is filed. Filings shown here are delayed by 72 hours.
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