RA Capital Nexus Fund III, L.P., Director, 10% Owner at Sionna Therapeutics, Inc. (SION), sold 666,432 shares at $39.50 ($26.3M) on 2025-10-24, disclosed to the SEC on 2025-10-28.
Open-market sale of $26.3M SION by Director, 10% Owner. Not flagged as scheduled, tax-driven, or recurring — but no specific bearish signal from our filters. Reasons for insider sales vary widely.
Nothing distinguishes this filing.
| # | Price | Shares | Value | % of Total |
|---|---|---|---|---|
| 1 | $39.50 | 14,116 | $558K | 2.1% |
| 2 | $39.50 | 66,672 | $2.6M | 10.0% |
| 3 | $39.50 | 107,941 | $4.3M | 16.2% |
| 4 | $39.50 | 107,941 | $4.3M | 16.2% |
| 5 | $39.50 | 122,271 | $4.8M | 18.3% |
| 6 | $39.50 | 122,271 |
| $4.8M |
| 18.3% |
| 7 | $39.58 | 3,624 | $143K | 0.5% |
| 8 | $39.58 | 3,624 | $143K | 0.5% |
| 9 | $39.58 | 10,476 | $415K | 1.6% |
| 10 | $39.58 | 10,476 | $415K | 1.6% |
| 11 | $39.58 | 17,118 | $678K | 2.6% |
| 12 | $39.58 | 17,118 | $678K | 2.6% |
| 13 | $39.58 | 31,392 | $1.2M | 4.7% |
| 14 | $39.58 | 31,392 | $1.2M | 4.7% |
| Total | $39.52 avg | 666,432 | $26.3M | 100% |
| Filing → |
| MLYS | BUY | 2023-02-16 | $20.0M | — | Filing → |