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Amphastar Pharmaceuticals, Inc. (AMPH)
NASDAQ: AMPH · Real-Time Price · USD
21.82
+0.17 (0.79%)
Apr 28, 2026, 4:00 PM EDT - Market closed

Amphastar Pharmaceuticals Stock Price History

Historical Data

DateOpenHighLowCloseAdj. CloseChangeVolume
Apr 28, 202621.7122.0421.5621.86-0.97%199,980
Apr 27, 202621.4722.0621.4621.6521.651.12%329,601
Apr 24, 202621.0521.6020.7721.4121.411.90%402,069
Apr 23, 202620.9921.2320.7721.0121.010.10%302,570
Apr 22, 202621.4021.5920.7720.9920.99-1.04%410,626
Apr 21, 202622.3822.6621.1021.2121.21-7.46%684,104
Apr 20, 202622.6723.2622.5422.9222.920.17%539,831
Apr 17, 202622.1823.0021.9822.8822.884.91%537,816
Apr 16, 202621.6722.0221.4121.8121.810.60%361,306
Apr 15, 202621.3821.7621.1921.6821.681.40%389,107
Apr 14, 202621.3621.7021.1221.3821.380.09%343,451
Apr 13, 202620.1721.4820.1721.3621.364.86%577,853
Apr 10, 202620.9821.1020.1420.3720.37-2.40%354,456
Apr 9, 202620.3221.1920.3220.8720.872.30%519,311
Apr 8, 202620.6821.0720.1820.4020.40-0.87%613,453
Apr 7, 202620.3920.8120.2620.5820.58-350,978
Apr 6, 202620.4520.7320.0420.5820.580.64%344,067
Apr 2, 202619.9520.6619.8820.4520.451.04%390,454
Apr 1, 202619.7420.3119.6820.2420.243.32%676,874
Mar 31, 202619.5320.0019.2719.5919.591.93%534,119
Mar 30, 202619.1519.6719.0719.2219.221.10%410,715
Mar 27, 202619.3719.6418.9219.0119.01-2.66%343,413
Mar 26, 202619.5019.8018.9819.5319.53-0.20%363,470
Mar 25, 202619.4519.9619.3919.5719.571.77%317,553
Mar 24, 202619.1019.5718.9819.2319.23-367,779
Mar 23, 202620.0420.0819.2319.2319.23-1.38%414,150
Mar 20, 202619.5619.7619.1519.5019.50-0.20%1,121,726
Mar 19, 202619.1019.8219.0619.5419.542.84%582,225
Mar 18, 202619.2119.4718.9719.0019.00-2.61%650,422
Mar 17, 202619.4820.0019.4819.5119.510.52%635,569
Mar 16, 202618.9319.4618.6519.4119.416.77%737,687
Mar 13, 202618.2318.4617.8118.1818.180.03%604,648
Mar 12, 202618.5818.5817.0318.1818.18-3.17%901,614
Mar 11, 202618.9119.5018.5218.7718.77-0.74%547,744
Mar 10, 202619.2119.5718.8418.9118.91-1.56%527,104
Mar 9, 202618.9719.3718.5219.2119.21-0.67%629,893
Mar 6, 202620.0520.0818.9419.3419.34-5.38%753,336
Mar 5, 202619.6720.6019.5420.4420.442.40%725,948
Mar 4, 202619.9720.2019.5619.9619.960.66%594,582
Mar 3, 202620.3521.0719.8119.8319.83-5.62%740,556
Mar 2, 202620.3021.1419.9521.0121.013.86%1,261,232
Feb 27, 202622.4423.2719.8320.2320.23-23.63%1,965,786
Feb 26, 202628.0028.1726.2726.4926.49-5.29%816,455
Feb 25, 202627.7327.9927.0327.9727.971.08%415,986
Feb 24, 202627.6528.3727.4227.6727.670.44%478,146
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%316,867
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%236,616
Feb 10, 202628.7528.9228.4928.5728.57-0.14%182,574
Feb 9, 202629.0829.2028.3728.6128.61-2.22%285,022
Feb 6, 202628.6129.4628.6129.2629.262.20%343,842
Feb 5, 202628.4529.2228.4528.6328.630.07%288,034
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%444,060
Jan 30, 202626.1526.6026.0426.4926.491.30%294,470
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%316,150
Jan 23, 202626.0326.3725.8125.9225.92-0.86%269,462
Jan 22, 202626.2526.9226.1026.1526.15-0.29%233,271
Jan 21, 202625.9626.5925.9326.2226.221.04%251,623
Jan 20, 202625.6226.7525.4725.9525.95-0.46%282,605
Jan 16, 202625.9426.2325.4226.0726.070.27%286,949
Jan 15, 202627.6527.6925.9426.0026.00-6.34%584,060
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%455,860
Jan 9, 202627.7128.0227.4327.7427.74-247,216
Jan 8, 202627.4028.3427.2327.7427.741.50%304,492
Jan 7, 202627.8328.2827.1527.3327.33-1.05%342,796
Jan 6, 202626.5327.7526.5127.6227.623.37%300,067
Jan 5, 202626.2127.4526.1126.7226.720.98%419,181
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%251,521
Dec 29, 202527.0027.2326.7726.7926.79-1.22%220,491
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%333,344
Dec 22, 202526.5027.4426.3527.3227.322.71%507,332
Dec 19, 202526.4026.8026.3326.6026.600.38%812,109
Dec 18, 202526.0426.6225.9226.5026.501.65%340,800
Dec 17, 202525.6026.5225.4726.0726.071.80%389,864
Dec 16, 202526.1826.3125.1625.6125.61-2.66%499,486
Dec 15, 202525.7826.5025.5626.3126.314.12%472,896
Dec 12, 202526.1326.1325.2025.2725.27-2.43%341,410
Dec 11, 202525.8125.9425.4725.9025.900.74%284,940
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%323,533
Dec 4, 202527.5827.8426.9727.1527.15-1.56%404,953
Dec 3, 202526.8627.8226.7527.5827.583.41%317,346