Peter A. Thompson, Director, 10% Owner at ALPINE IMMUNE SCIENCES, INC. (ALPN), bought 2,021,274 shares at $9.40 ($19.0M) on 2021-09-17, disclosed to the SEC on 2021-09-21.
High-signal trade — passes our conviction filters but the AI narrative is still being generated. Check back shortly.
Nothing distinguishes this filing.
| # | Price | Shares | Value | % of Total |
|---|---|---|---|---|
| 1 | $9.40 | 425,531 | $4.0M | 21.1% |
| 2 | $9.40 | 425,531 | $4.0M | 21.1% |
| 3 | $9.40 | 585,106 | $5.5M | 28.9% |
| 4 | $9.40 | 585,106 | $5.5M | 28.9% |
| Total | $9.40 avg | 2,021,274 | $19.0M | 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 → |