Ra Capital Management, L.p. sold $22M of SION
director, owner at Sionna Therapeutics, Inc.. 3,448,811 shares at an average of $6.33, traded Sep 17, 2026, filed Sep 21, 2026.
Score components
- +15RoleDirector
- +25Trade size$21.8M at market
- +10Share of holdings soldSold 50% of holdings
- 0ClusterNo other insider selling within 14 days
What happened after comparable sells
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0001231919-26-001201, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Sep 17, 2026 | SOpen-market sale Common Stockindirect: See footnotes | -3,415,011 | $6.32 | $22M | 3,482,612 | 21 d ago |
| Sep 17, 2026 | SOpen-market sale Common Stockindirect: See footnotes | -33,800 | $7.46 | $252k | 3,448,812 | 21 d ago |
Related signals
Other insiders at Sionna Therapeutics, Inc. and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 53Moderate | Sionna Therapeutics, Inc. | Tpg Gp A, LLC owner | $20M 1,125,000 shares | +20% | |
| 50Moderate | Sionna Therapeutics, Inc. | Atlas Venture Fund XI, L.P. owner | $1.1M 60,000 shares | +8% | |
| 58Moderate | Sionna Therapeutics, Inc. | Bruce Booth director | $1.1M 60,000 shares | +8% | |
| 58Moderate | Sionna Therapeutics, Inc. | Ra Capital Management, L.p. director, owner | $20M 1,125,000 shares | +19% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.