Amphastar Pharmaceuticals Inc. (AMPH)
Showing Closing Date Range from Apr 16 to Oct 13, 2026 compared to Oct 17, 2025 to Apr 15, 2026.
Compare Last 6 Months with Previous Period
Investor Relations:ir.amphastar.com
Current Period Close
$26.05
Apr 16, 2026 - Oct 13, 2026
Previous Period Close
$21.68
Oct 17, 2025 - Apr 15, 2026
Net Comparison Delta
+$4.37 (+20.16%)
Relative performance vs prior benchmark
Historical Quotes & Breakdown(121 dates)
| Current Date | Current Close | Previous Date | Previous Close | Delta (%) |
|---|---|---|---|---|
| Oct 13, 2026 | $26.05 | Apr 13, 2026 | $21.36 | +21.96% |
| Oct 12, 2026 | $26.76 | Apr 10, 2026 | $20.37 | +31.37% |
| Oct 09, 2026 | $26.62 | Apr 09, 2026 | $20.87 | +27.55% |
| Oct 08, 2026 | $25.81 | Apr 08, 2026 | $20.40 | +26.52% |
| Oct 07, 2026 | $25.54 | Apr 07, 2026 | $20.58 | +24.10% |
| Oct 06, 2026 | $25.91 | Apr 06, 2026 | $20.58 | +25.90% |
| Oct 05, 2026 | $25.37 | Apr 02, 2026 | $20.45 | +24.06% |
| Oct 02, 2026 | $25.43 | Apr 01, 2026 | $20.24 | +25.64% |
| Sep 25, 2026 | $26.13 | Mar 31, 2026 | $19.59 | +33.38% |
| Sep 24, 2026 | $26.27 | Mar 30, 2026 | $19.22 | +36.68% |
| Sep 23, 2026 | $24.96 | Mar 27, 2026 | $19.01 | +31.30% |
| Sep 22, 2026 | $24.32 | Mar 26, 2026 | $19.53 | +24.53% |
| Sep 21, 2026 | $24.48 | Mar 25, 2026 | $19.57 | +25.09% |
| Sep 18, 2026 | $23.62 | Mar 24, 2026 | $19.23 | +22.83% |
| Sep 17, 2026 | $23.82 | Mar 23, 2026 | $19.23 | +23.87% |
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