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Amphastar Pharmaceuticals, Inc. (AMPH)
NASDAQ: AMPH · Real-Time Price · USD
20.23
-6.26 (-23.63%)
At close: Feb 27, 2026, 4:00 PM EST
20.63
+0.40 (1.98%)
After-hours: Feb 27, 2026, 7:56 PM EST

Amphastar Pharmaceuticals Stock Price History

Historical Data

DateOpenHighLowCloseAdj. CloseChangeVolume
Feb 27, 202622.4423.2719.8320.2720.27-23.48%1,965,341
Feb 26, 202628.0028.1726.2726.4926.49-5.29%809,082
Feb 25, 202627.7327.9927.0327.9727.971.08%415,986
Feb 24, 202627.6528.3727.4227.6727.670.44%478,086
Feb 23, 202628.4228.7527.1927.5527.55-3.43%496,697
Feb 20, 202628.5828.9828.0328.5328.53-0.04%508,412
Feb 19, 202628.5628.7128.4228.5428.54-0.42%340,673
Feb 18, 202628.4529.1628.3628.6628.660.74%325,939
Feb 17, 202628.6529.2328.3928.4528.45-0.18%316,858
Feb 13, 202627.8229.0027.7628.5028.503.45%268,689
Feb 12, 202628.6228.6227.2427.5527.55-3.64%437,541
Feb 11, 202628.6229.0928.4828.5928.590.07%236,613
Feb 10, 202628.7528.9228.4928.5728.57-0.14%182,327
Feb 9, 202629.0829.2028.3728.6128.61-2.22%284,951
Feb 6, 202628.6129.4628.6129.2629.262.20%343,837
Feb 5, 202628.4529.2228.4528.6328.630.07%287,455
Feb 4, 202628.7929.3728.5628.6128.611.31%378,851
Feb 3, 202627.5728.2827.0628.2428.241.15%506,290
Feb 2, 202626.3628.1326.3427.9227.925.40%443,983
Jan 30, 202626.1526.6026.0426.4926.491.30%294,463
Jan 29, 202626.1026.4325.8026.1526.150.11%184,370
Jan 28, 202626.4526.4525.8626.1226.12-0.50%209,032
Jan 27, 202626.3926.5825.8126.2526.25-1.32%264,507
Jan 26, 202625.9226.7125.6326.6026.602.62%316,050
Jan 23, 202626.0326.3725.8125.9225.92-0.86%269,346
Jan 22, 202626.2526.9226.1026.1526.15-0.29%231,737
Jan 21, 202625.9626.5925.9326.2226.221.04%251,622
Jan 20, 202625.6226.7525.4725.9525.95-0.46%282,570
Jan 16, 202625.9426.2325.4226.0726.070.27%284,511
Jan 15, 202627.6527.6925.9426.0026.00-6.34%583,625
Jan 14, 202628.8029.2027.6127.7627.76-3.98%472,419
Jan 13, 202629.1629.3828.4028.9128.91-1.67%345,642
Jan 12, 202628.0529.5227.3129.4029.405.98%455,592
Jan 9, 202627.7128.0227.4327.7427.74-247,198
Jan 8, 202627.4028.3427.2327.7427.741.50%302,643
Jan 7, 202627.8328.2827.1527.3327.33-1.05%342,796
Jan 6, 202626.5327.7526.5127.6227.623.37%299,567
Jan 5, 202626.2127.4526.1126.7226.720.98%418,742
Jan 2, 202626.9126.9326.0226.4626.46-1.19%405,969
Dec 31, 202527.0627.0626.6426.7826.78-0.81%218,279
Dec 30, 202526.7527.1626.7327.0027.000.78%246,950
Dec 29, 202527.0027.2326.7726.7926.79-1.22%215,206
Dec 26, 202526.7727.1726.5527.1227.121.16%229,035
Dec 24, 202526.4527.1226.4426.8126.811.36%175,168
Dec 23, 202527.2427.2626.2626.4526.45-3.18%324,703
Dec 22, 202526.5027.4426.3527.3227.322.71%474,461
Dec 19, 202526.4026.8026.3326.6026.600.38%807,026
Dec 18, 202526.0426.6225.9226.5026.501.65%340,750
Dec 17, 202525.6026.5225.4726.0726.071.80%389,839
Dec 16, 202526.1826.3125.1625.6125.61-2.66%499,486
Dec 15, 202525.7826.5025.5626.3126.314.12%472,889
Dec 12, 202526.1326.1325.2025.2725.27-2.43%341,410
Dec 11, 202525.8125.9425.4725.9025.900.74%284,907
Dec 10, 202525.6425.9125.2225.7125.710.23%483,522
Dec 9, 202525.9726.3925.5625.6525.65-1.38%414,104
Dec 8, 202526.8126.8525.9526.0126.01-2.84%300,935
Dec 5, 202527.1527.4726.6926.7726.77-1.40%323,306
Dec 4, 202527.5827.8426.9727.1527.15-1.56%404,953
Dec 3, 202526.8627.8226.7527.5827.583.41%317,346
Dec 2, 202527.4627.6226.2326.6726.67-2.84%456,357
Dec 1, 202527.4427.8227.3027.4527.45-0.90%355,915
Nov 28, 202527.4727.7827.3727.7027.701.24%208,311
Nov 26, 202527.4427.8327.2327.3627.36-1.19%410,854
Nov 25, 202527.0027.7626.9027.6927.693.67%375,501
Nov 24, 202525.9626.7925.8226.7126.712.69%349,465
Nov 21, 202525.4526.5325.4026.0126.012.56%392,921
Nov 20, 202525.5426.0124.9225.3625.36-0.04%355,832
Nov 19, 202525.8126.2825.1325.3725.37-2.05%524,386
Nov 18, 202525.8226.5725.3925.9025.90-0.46%484,851
Nov 17, 202526.0426.5425.6926.0226.02-0.15%417,693
Nov 14, 202526.1526.4725.9026.0626.06-1.18%294,122
Nov 13, 202527.6627.8626.0026.3726.37-5.25%488,815
Nov 12, 202527.1629.0027.1227.8327.832.47%685,779
Nov 11, 202526.0027.2126.0027.1627.163.98%541,178
Nov 10, 202524.0326.8323.8126.1226.128.70%826,318
Nov 7, 202526.1527.4023.6724.0324.03-0.83%809,392
Nov 6, 202525.4125.5324.1524.2324.23-4.27%767,419
Nov 5, 202525.0725.6525.0725.3125.310.20%335,208
Nov 4, 202525.2025.4024.9325.2625.26-0.16%416,494
Nov 3, 202525.3025.8524.9025.3025.30-0.78%361,693
Oct 31, 202524.3625.6024.2425.5025.503.41%552,330
Oct 30, 202524.2424.8124.0224.6624.661.73%390,822
Oct 29, 202524.0124.7123.9024.2424.240.25%363,133
Oct 28, 202523.9224.4523.7724.1824.180.58%264,331
Oct 27, 202524.3824.5523.9824.0424.04-1.96%319,227
Oct 24, 202524.7224.8924.4624.5224.52-0.81%220,779
Oct 23, 202524.5924.8724.2424.7224.720.82%309,413
Oct 22, 202524.1424.8323.9724.5224.521.07%582,786
Oct 21, 202523.7324.3823.7324.2624.262.23%335,175
Oct 20, 202523.7824.1023.6723.7323.73-0.21%255,762
Oct 17, 202523.0923.8923.0923.7823.782.41%321,594
Oct 16, 202523.1323.6122.9423.2223.220.35%449,608
Oct 15, 202523.8524.2022.9423.1423.14-3.02%504,313
Oct 14, 202523.3323.9823.3323.8623.861.49%282,166
Oct 13, 202523.6924.2123.4223.5123.51-0.51%324,141
Oct 10, 202525.0125.0223.2023.6323.63-5.37%607,448
Oct 9, 202525.9226.1124.6824.9724.97-3.89%441,557
Oct 8, 202526.0026.3225.5725.9825.980.58%250,038
Oct 7, 202526.4526.6825.8025.8325.83-2.82%390,489
Oct 6, 202526.8227.0726.5326.5826.58-0.64%241,845