Peter A. Thompson, Director at ALPINE IMMUNE SCIENCES, INC. (ALPN), sold 3,092,694 shares at $18.32 ($57.3M) on 2023-12-28, disclosed to the SEC on 2023-12-29.
Open-market sale of $57.3M ALPN by Director. 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 | $19.96 | 18,922 | $378K | 0.7% |
| 2 | $19.96 | 18,922 | $378K | 0.7% |
| 3 | $19.96 | 162,576 | $3.2M | 5.7% |
| 4 | $19.96 | 162,576 | $3.2M | 5.7% |
| 5 | $18.32 | 1,195,683 | $21.9M | 38.2% |
| 6 | $18.32 | 139,166 |
| $2.5M |
| 4.4% |
| 7 | $18.32 | 139,166 | $2.5M | 4.4% |
| 8 | $18.32 | 1,195,683 | $21.9M | 38.2% |
| 9 | $19.82 | 3,128 | $62K | 0.1% |
| 10 | $19.82 | 3,128 | $62K | 0.1% |
| 11 | $19.82 | 26,872 | $533K | 0.9% |
| 12 | $19.82 | 26,872 | $533K | 0.9% |
| Total | $18.54 avg | 3,092,694 | $57.3M | 100% |
| Filing → |
| SION | SELL | 2026-05-29 | $4K | — | Filing → |
| SION | SELL | 2026-05-11 | $13.4M | — | Filing → |
| SION | SELL | 2026-04-21 | $2.5M | — | Filing → |