AMPH Earnings Reaction History
Amphastar Pharmaceuticals, Inc.
EPS, Revenue, Stock Move
AMPH stock falls 1.1% on average on the first trading day after earnings.
When AMPH delivers a double beat, the stock rises 3.3% on average on the first trading day.
Across 40 releases, AMPH has delivered a positive next-day return 50.0% of the time.
Reaction Snapshot (Avg Day 1-3)
Day 1
-1.12%
Day 2
-0.14%
Day 3
+0.83%
Conditioned Moves (Day 1 Basis)
Double Beat
+3.34%
Mixed
-1.41%
Double Miss
-16.12%
EPS Beat Rate
70.0%
Revenue Beat Rate
67.5%
Positive Rate
50.0%
Both Beat Rate
52.5%
Recent Earnings History
| Date | EPS | Revenue | Day 1 | Day 2 | Day 3 | Detail |
|---|---|---|---|---|---|---|
| 2026-08-06 | Beat+56.86% | Beat+2.21% | +4.90% | -2.26% | +0.54% | Open |
| 2026-05-07 | Miss-58.06% | Miss-1.32% | -20.93% | -2.89% | -5.15% | Open |
| 2026-02-26 | Miss-31.46% | Miss-3.00% | -23.63% | +3.86% | -5.62% | Open |
| 2025-11-06 | Beat+13.70% | Beat+0.71% | -0.83% | +8.70% | +3.98% | Open |
| 2025-08-07 | Beat+17.19% | Miss-1.52% | +10.13% | +14.91% | +10.93% | Open |
| 2025-05-07 | Beat+5.17% | Miss-1.46% | +0.90% | -2.19% | +0.95% | Open |
| 2025-02-27 | Beat+3.75% | Miss-1.19% | -9.72% | -3.20% | +0.36% | Open |
| 2024-11-06 | Miss-6.45% | Miss-1.70% | -13.69% | +4.82% | +0.54% | Open |
FAQ
How much does AMPH usually move after earnings?
AMPH moves about 1.1% on average on the first trading day after earnings. Net average direction is -1.12%.
What is AMPH's biggest post-earnings gain?
AMPH's largest recorded next-day earnings gain is +16.34%, on 2016-11-08.