5 DAY PERFORMANCE
-11.64%
1 MONTH PERFORMANCE
+2.62%
3 MONTH PERFORMANCE
+4.35%
6 MONTH PERFORMANCE
-30.57%
YEAR-TO-DATE PERFORMANCE
-28.27%
1 YEAR PERFORMANCE
-37.02%
Amphastar Pharmaceuticals Inc Stock Chart
Share Price History
| Date | Opening Price | Closing Price | High | Low | Volume | Market Capitalization |
|---|---|---|---|---|---|---|
| 08/21/2026 | $21.64 | $21.60 (-0.18%) | $22.20 | $21.44 | 376.60 K | $942.71 M |
| 08/20/2026 | $21.38 | $21.68 (1.4%) | $21.76 | $21.24 | 338.70 K | $946.20 M |
| 08/19/2026 | $21.64 | $21.74 (0.46%) | $21.99 | $21.15 | 410.80 K | $948.82 M |
| 08/18/2026 | $21.11 | $21.34 (1.09%) | $21.59 | $21.08 | 411.88 K | $931.36 M |
| 08/17/2026 | $20.90 | $20.86 (-0.19%) | $21.23 | $20.77 | 533.50 K | $910.41 M |
| 08/14/2026 | $20.02 | $20.91 (4.45%) | $21.07 | $19.89 | 305.70 K | $912.60 M |
| 08/13/2026 | $20.18 | $20.18 (0%) | $20.27 | $19.84 | 526.12 K | $880.74 M |
| 08/12/2026 | $20.16 | $19.98 (-0.89%) | $20.22 | $19.61 | 343.84 K | $872.01 M |
| 08/11/2026 | $20.00 | $20.42 (2.1%) | $20.57 | $20.00 | 570.50 K | $891.21 M |
| 08/10/2026 | $20.74 | $20.31 (-2.07%) | $20.90 | $19.55 | 645.75 K | $886.41 M |
| 08/07/2026 | $22.48 | $20.78 (-7.56%) | $22.65 | $20.40 | 1.30 M | $906.92 M |
| 08/06/2026 | $20.22 | $19.81 (-2.03%) | $20.25 | $19.60 | 527.33 K | $864.59 M |
| 08/05/2026 | $20.06 | $20.24 (0.9%) | $20.28 | $19.88 | 351.62 K | $883.35 M |
| 08/04/2026 | $20.11 | $19.90 (-1.04%) | $20.38 | $19.86 | 481.65 K | $868.52 M |
| 08/03/2026 | $20.11 | $20.22 (0.55%) | $20.45 | $19.70 | 413.20 K | $882.48 M |
| 07/31/2026 | $20.35 | $19.94 (-2.01%) | $20.41 | $19.67 | 367.63 K | $870.26 M |
| 07/30/2026 | $20.31 | $20.38 (0.34%) | $20.53 | $19.95 | 355.70 K | $889.46 M |
| 07/29/2026 | $20.24 | $20.58 (1.68%) | $20.70 | $19.99 | 321.70 K | $898.19 M |
| 07/28/2026 | $19.38 | $20.15 (3.97%) | $20.27 | $19.38 | 390.84 K | $879.43 M |
| 07/27/2026 | $18.97 | $19.18 (1.11%) | $19.31 | $18.96 | 285.92 K | $837.09 M |
| 07/24/2026 | $18.90 | $18.72 (-0.95%) | $19.12 | $18.50 | 445.70 K | $817.02 M |
| 07/23/2026 | $19.08 | $18.87 (-1.1%) | $19.34 | $18.73 | 650.43 K | $823.56 M |
| 07/22/2026 | $19.71 | $19.30 (-2.08%) | $19.95 | $19.20 | 409.24 K | $842.33 M |
| 07/21/2026 | $19.42 | $19.59 (0.88%) | $19.89 | $19.42 | 621.10 K | $854.99 M |
| 07/20/2026 | $19.78 | $19.63 (-0.76%) | $19.91 | $19.52 | 437.42 K | $856.73 M |
| 07/17/2026 | $19.84 | $19.75 (-0.45%) | $20.35 | $19.63 | 338.50 K | $861.97 M |
| 07/16/2026 | $19.40 | $19.86 (2.37%) | $20.14 | $19.40 | 416.90 K | $866.77 M |
| 07/15/2026 | $18.87 | $19.40 (2.81%) | $19.50 | $18.83 | 356.10 K | $846.69 M |
| 07/14/2026 | $19.10 | $18.81 (-1.52%) | $19.39 | $18.41 | 334.75 K | $820.94 M |
| 07/13/2026 | $19.00 | $19.29 (1.53%) | $19.68 | $18.95 | 384.54 K | $841.89 M |
| 07/10/2026 | $18.97 | $18.72 (-1.32%) | $19.15 | $18.61 | 311.10 K | $817.02 M |
| 07/09/2026 | $18.86 | $19.02 (0.85%) | $19.13 | $18.61 | 446.63 K | $830.11 M |
| 07/08/2026 | $19.96 | $18.88 (-5.41%) | $19.96 | $18.52 | 438.70 K | $824.00 M |
| 07/07/2026 | $20.06 | $20.08 (0.1%) | $20.28 | $19.74 | 450.00 K | $876.37 M |
| 07/06/2026 | $19.48 | $19.61 (0.67%) | $20.01 | $19.08 | 313.80 K | $855.86 M |
| 07/02/2026 | $20.35 | $19.64 (-3.49%) | $20.35 | $19.63 | 315.80 K | $857.17 M |
| 07/01/2026 | $20.32 | $20.10 (-1.08%) | $20.54 | $19.91 | 422.11 K | $877.24 M |
| 06/30/2026 | $20.71 | $20.18 (-2.56%) | $20.71 | $19.86 | 400.21 K | $880.74 M |
| 06/29/2026 | $21.12 | $20.71 (-1.94%) | $21.24 | $19.66 | 727.10 K | $903.87 M |
| 06/26/2026 | $21.01 | $21.78 (3.66%) | $21.81 | $20.88 | 624.00 K | $950.57 M |
| 06/25/2026 | $21.00 | $21.04 (0.19%) | $22.00 | $20.79 | 481.30 K | $918.27 M |
| 06/24/2026 | $19.77 | $21.02 (6.32%) | $21.09 | $19.77 | 701.21 K | $917.40 M |
| 06/23/2026 | $18.61 | $19.53 (4.94%) | $19.58 | $18.50 | 660.90 K | $852.37 M |
| 06/22/2026 | $18.80 | $18.33 (-2.5%) | $18.90 | $18.22 | 767.44 K | $799.99 M |
| 06/18/2026 | $19.51 | $18.81 (-3.59%) | $19.66 | $18.70 | 1.33 M | $820.94 M |
| 06/17/2026 | $19.94 | $19.41 (-2.66%) | $20.26 | $19.15 | 1.01 M | $847.13 M |
| 06/16/2026 | $19.91 | $19.96 (0.25%) | $20.41 | $19.61 | 724.21 K | $871.13 M |
| 06/15/2026 | $20.11 | $19.71 (-1.99%) | $20.29 | $19.59 | 528.51 K | $860.22 M |
| 06/12/2026 | $19.90 | $20.09 (0.95%) | $20.55 | $19.90 | 377.80 K | $876.81 M |
| 06/11/2026 | $20.15 | $20.53 (1.89%) | $20.65 | $20.10 | 463.56 K | $896.01 M |
| 06/10/2026 | $20.21 | $20.29 (0.4%) | $20.77 | $19.99 | 405.20 K | $885.54 M |
| 06/09/2026 | $19.53 | $20.16 (3.23%) | $20.27 | $19.53 | 506.30 K | $879.86 M |
| 06/08/2026 | $19.75 | $19.39 (-1.82%) | $19.85 | $19.34 | 559.00 K | $846.26 M |
| 06/05/2026 | $18.86 | $19.74 (4.67%) | $20.14 | $18.85 | 750.30 K | $861.53 M |
| 06/04/2026 | $18.28 | $18.70 (2.3%) | $18.90 | $18.28 | 459.23 K | $816.14 M |
| 06/03/2026 | $18.26 | $18.12 (-0.77%) | $18.36 | $17.73 | 509.34 K | $790.83 M |
| 06/02/2026 | $18.36 | $18.45 (0.49%) | $18.67 | $18.10 | 810.64 K | $805.23 M |
| 06/01/2026 | $18.63 | $18.42 (-1.13%) | $19.01 | $18.22 | 569.70 K | $803.92 M |
| 05/29/2026 | $19.28 | $18.85 (-2.23%) | $19.46 | $18.55 | 849.10 K | $822.69 M |
| 05/28/2026 | $19.04 | $19.30 (1.37%) | $19.55 | $19.02 | 621.22 K | $842.33 M |
| 05/27/2026 | $19.31 | $19.10 (-1.09%) | $19.34 | $18.50 | 501.59 K | $833.60 M |
| 05/26/2026 | $18.45 | $18.81 (1.95%) | $19.12 | $18.45 | 670.80 K | $820.94 M |
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