Richard K. Prins, Director at Amphastar Pharmaceuticals, Inc. (AMPH), sold 7,973 shares at $20.30 ($162K) on 2026-08-11, disclosed to the SEC on 2026-08-12.
Seasonal sale ($162k) by Director — this insider has traded AMPH in August in at least three consecutive prior years. Pattern-driven, low signal.
Negative factors outweigh the positive ones.
| Filing → |
| AMPH | SELL | 2024-11-13 | $244K | — | Filing → |
| AMPH | SELL | 2024-08-13 | $1.5M | — | Filing → |
| AMPH | SELL | 2023-11-20 | $223K | — | Filing → |