Amphastar Pharmaceuticals, Inc. insider trading
AMPH$25.43+0.08 (+0.32% today)
“Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise.”
Insider Trading vs Stock Price
Insider Trading vs Stock Price data
Showing the 1Y range: Oct 2, 2025 to Oct 2, 2026. Price (-4.1%). 0 insider transactions plotted in this window as 0 markers; nearby trades of the same kind are grouped.
| Date | Category | Person | Role | Action | Amount | Change in holding |
|---|
Open market purchase
Open market sellNet dollar flow · Buy / Sell balance
PremiumQ2 '25Q3 '25Q4 '25Q1 '26Q2 '26Q3 '26
Unlock quarterly net flowKey players
- RZRong Zhou0.6438%
- WJWilliam J. Peters0.3966%
- HLHoward Lee0.3746%
- YLYakob Liawatidewi0.2923%
- FFFloyd F. Petersen0.1678%
- MAMichael A. Zasloff0.0885%
- DGDiane G. Gerst0.075%
- RKRichard K. Prins0.0696%
- GDGayle Deflin0.0448%
- DRDavid Russell Gaugh0.034%
AI Activity Analysis
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Insider activity
Fromto
| Company | Insider / role | Action | ΔOwn | Avg price | Amount | ||
|---|---|---|---|---|---|---|---|
| AMPH | William J. Peters | Open market sell$103K | -2.4% | $25.00 | $103K | Sep 21, 2026 | Sep 23, 2026 |
| AMPH | Rong Zhou | Open market sell$75.3K | -1.8% | $23.63 | $75.3K | Sep 2, 2026 | Sep 3, 2026 |
| AMPH | Richard K. Prins | Open market sell$162K | -21.2% | $20.30 | $162K | Aug 11, 2026 | Aug 12, 2026 |
| AMPH | Floyd F. Petersen | Open market sell$62.9K | -3.3% | $25.92 | $62.9K | Dec 12, 2025 | Dec 15, 2025 |
| AMPH | Floyd F. Petersen | Open market sell$44.6K | -2.3% | $25.69 | $44.6K | Dec 11, 2025 | Dec 15, 2025 |
| AMPH | Floyd F. Petersen | Open market sell$12.6K | -0.7% | $25.27 | $12.6K | Nov 3, 2025 | Nov 5, 2025 |