Bruce Booth sold $5.9M of SION
director at Sionna Therapeutics, Inc.. 194,932 shares at an average of $30.47, traded Oct 10, 2025, filed Oct 15, 2025.
Score components
- +15RoleDirector
- +25Trade size$5.9M at market
- 0Share of holdings soldSold 7.0% of holdings
- +15Cluster3 insiders selling within 14 days
- -2010b5-1 planPre-scheduled under a 10b5-1 plan
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.
This signal so far: 1m +19.7%, 3m +33.2%, 6m +45.9%.
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 0001451612-25-000008, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Oct 10, 2025 | SOpen-market sale Common Stockindirect: By Atlas Venture Fund XI, L.P.10b5-1 | -16,727 | $29.98 | $501k | 2,763,574 | Oct 15, 2025 |
| Oct 10, 2025 | SOpen-market sale Common Stockindirect: By Atlas Venture Opportunity Fund II, L.P.10b5-1 | -3,511 | $29.98 | $105k | 781,969 | Oct 15, 2025 |
| Oct 13, 2025 | SOpen-market sale Common Stockindirect: By Atlas Venture Fund XI, L.P.10b5-1 | -44,048 | $30.32 | $1.3M | 2,719,526 | Oct 15, 2025 |
| Oct 13, 2025 | SOpen-market sale Common Stockindirect: By Atlas Venture Opportunity Fund II, L.P.10b5-1 | -9,245 | $30.32 | $280k | 772,724 | Oct 15, 2025 |
| Oct 13, 2025 | SOpen-market sale Common Stockindirect: By Atlas Venture Fund XI, L.P.10b5-1 | -4,082 | $31.03 | $127k | 2,715,444 | Oct 15, 2025 |
| Oct 13, 2025 | SOpen-market sale Common Stockindirect: By Atlas Venture Opportunity Fund II, L.P.10b5-1 | -857 | $31.03 | $27k | 771,867 | Oct 15, 2025 |
| Oct 14, 2025 | SOpen-market sale Common Stockindirect: By Atlas Venture Fund XI, L.P.10b5-1 | -501 | $29.95 | $15k | 2,714,943 | Oct 15, 2025 |
| Oct 14, 2025 | SOpen-market sale Common Stockindirect: By Atlas Venture Opportunity Fund II, L.P.10b5-1 | -105 | $29.95 | $3,145 | 771,762 | Oct 15, 2025 |
| Oct 15, 2025 | SOpen-market sale Common Stockindirect: By Atlas Venture Fund XI, L.P.10b5-1 | -65,726 | $30.37 | $2.0M | 2,649,217 | Oct 15, 2025 |
| Oct 15, 2025 | SOpen-market sale Common Stockindirect: By Atlas Venture Opportunity Fund II, L.P.10b5-1 | -13,795 | $30.37 | $419k | 757,967 | Oct 15, 2025 |
| Oct 15, 2025 | SOpen-market sale Common Stockindirect: By Atlas Venture Fund XI, L.P.10b5-1 | -30,032 | $31.12 | $935k | 2,619,185 | Oct 15, 2025 |
| Oct 15, 2025 | SOpen-market sale Common Stockindirect: By Atlas Venture Opportunity Fund II, L.P.10b5-1 | -6,303 | $31.12 | $196k | 751,664 | Oct 15, 2025 |
Related signals
Other insiders at Sionna Therapeutics, Inc. and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 50Moderate | SIONsell Sionna Therapeutics, Inc. | Ra Capital Management, L.p. director, owner | $22M 3,448,811 shares | -50% | |
| 35Weak | Sionna Therapeutics, Inc. | Orbimed Advisors LLC director | $3.9M 85,918 shares | -3% | |
| 35Weak | Sionna Therapeutics, Inc. | Peter A. Thompson director | $3.9M 85,918 shares | -3% | |
| 32Weak | Sionna Therapeutics, Inc. | Jennifer Fitzpatrick Chief Legal Officer | $447k 10,250 shares | -100% | |
| 35Weak | Sionna Therapeutics, Inc. | Orbimed Advisors LLC director | $5.3M 115,844 shares | -4% | |
| 35Weak | Sionna Therapeutics, Inc. | Peter A. Thompson director | $5.3M 115,844 shares | -4% | |
| 3Weak | Sionna Therapeutics, Inc. | Orbimed Advisors LLC director | $4,493 101 shares | -0% | |
| 3Weak | Sionna Therapeutics, Inc. | Peter A. Thompson director | $4,493 101 shares | -0% | |
| 28Weak | Sionna Therapeutics, Inc. | Orbimed Advisors LLC director | $13M 292,952 shares | -10% | |
| 28Weak | Sionna Therapeutics, Inc. | Peter A. Thompson director | $13M 292,952 shares | -10% |
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.