Form 4: Sionna Therapeutics Insider Sells Shares
Insider Transaction (Form 4)
Ra Capital Management, L.P. and 5 others reported changes in beneficial ownership of Sionna Therapeutics, Inc. common stock on September 17, 2026.
Summary
- Open-market sale: disposed of 3,415,011 Common Stock at $6.32 ($21,582,870) on September 17, 2026; holds 3,482,612 after (Indirect).
- Open-market sale: disposed of 33,800 Common Stock at $7.46 ($252,148) on September 17, 2026; holds 3,448,812 after (Indirect).
Sentiment
Score: 2
Explanation: StockSavvy.ai views this as a mildly negative signal: an insider sold $21,835,018 of stock on the open market.
Insider Transactions
Ra Capital Management, L.P. — Director, 10% owner
RA Capital Healthcare Fund LP — Director
RA Capital Nexus Fund, L.P. — Director
RA Capital Nexus Fund III, L.P. — Director
Peter Kolchinsky — Director, 10% owner
Rajeev M. Shah — Director, 10% owner
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-09-17 | Open-market sale | Common Stock | 3,415,011 | $6 | $21.6M | 3,482,612 |
| 2026-09-17 | Open-market sale | Common Stock | 33,800 | $7 | $252.1K | 3,448,812 |
Key Dates
| Date | Description |
|---|---|
| 2026-09-17 | Open-market sale (3,415,011 shares) |
| 2026-09-17 | Open-market sale (33,800 shares) |
Keywords
insider transaction, Form 4, SION, Sionna Therapeutics, Inc., bearish, Ra Capital Management, L.P., RA Capital Healthcare Fund LP, RA Capital Nexus Fund, L.P., RA Capital Nexus Fund III, L.P., Peter Kolchinsky, Rajeev M. Shah
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