Skip to main content
logo
Amphastar Pharmaceuticals, Inc. (AMPH)
NASDAQ: AMPH · Real-Time Price · USD
25.98
+0.15 (0.58%)
At close: Oct 8, 2025, 4:00 PM EDT
25.66
-0.32 (-1.24%)
After-hours: Oct 8, 2025, 4:11 PM EDT

Amphastar Pharmaceuticals Stock Price History

Historical Data

DateOpenHighLowCloseAdj. CloseChangeVolume
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
Oct 3, 202526.5127.3126.4626.7526.750.87%331,099
Oct 2, 202526.8627.0326.4626.5226.52-1.74%288,366
Oct 1, 202526.7427.3926.7426.9926.991.28%337,099
Sep 30, 202526.9327.2726.4726.6526.65-1.00%392,172
Sep 29, 202526.8727.2126.3526.9226.920.26%513,361
Sep 26, 202526.6226.9226.3426.8526.851.86%291,264
Sep 25, 202526.8826.8925.9526.3626.36-1.90%565,989
Sep 24, 202527.4327.6226.7826.8726.87-1.97%302,731
Sep 23, 202527.8828.2227.2127.4127.41-1.72%323,932
Sep 22, 202527.8828.2427.6127.8927.890.90%424,678
Sep 19, 202527.3727.7726.8727.6427.640.73%1,384,028
Sep 18, 202527.0927.7026.9027.4427.441.70%458,903
Sep 17, 202527.1327.9026.5726.9826.98-0.07%920,934
Sep 16, 202527.3027.5126.8727.0027.00-0.99%497,864
Sep 15, 202528.0728.3927.2327.2727.27-2.82%422,797
Sep 12, 202528.8628.8627.9128.0628.06-2.16%273,671
Sep 11, 202528.3628.8928.3628.6828.680.99%422,254
Sep 10, 202529.1829.2628.3428.4028.40-3.17%309,841
Sep 9, 202529.2629.4328.9929.3329.330.24%379,382
Sep 8, 202529.3029.4128.4929.2629.26-0.54%385,699
Sep 5, 202529.0829.7828.9829.4229.420.79%414,943
Sep 4, 202529.3929.5928.8829.1929.19-0.68%553,530
Sep 3, 202530.4931.1029.2929.3929.39-4.61%566,946
Sep 2, 202530.8631.2630.4430.8130.810.62%414,770
Aug 29, 202530.2130.8130.1830.6230.621.19%290,925
Aug 28, 202530.5030.5629.8630.2630.26-0.75%316,721
Aug 27, 202530.1030.9530.1030.4930.490.49%326,146
Aug 26, 202529.9830.8029.9330.3430.341.71%408,475
Aug 25, 202530.5330.5529.4729.8329.83-2.20%374,384
Aug 22, 202529.9830.9029.9830.5030.502.83%494,915
Aug 21, 202529.5730.4229.4329.6629.660.14%491,388
Aug 20, 202530.2130.3929.4229.6229.62-2.34%434,164
Aug 19, 202529.9330.9929.8530.3330.331.92%527,820
Aug 18, 202529.8330.6529.5829.7629.76-0.23%433,187
Aug 15, 202530.2130.6329.8229.8329.83-1.26%651,993
Aug 14, 202530.0330.6329.6430.2130.21-0.89%464,377
Aug 13, 202530.4431.2330.0030.4830.480.43%1,016,810
Aug 12, 202528.1830.6328.1430.3530.3510.93%1,601,991
Aug 11, 202524.7327.4124.6927.3627.3614.91%1,816,531
Aug 8, 202522.2924.7022.0723.8123.8110.13%1,005,009
Aug 7, 202521.1521.7420.7021.6221.623.84%705,613
Aug 6, 202521.4221.6820.7920.8220.82-2.89%414,589
Aug 5, 202521.4421.5721.1821.4421.440.19%388,966
Aug 4, 202521.1921.4320.8821.4021.400.90%463,650
Aug 1, 202520.8621.2520.3921.2121.211.24%440,154
Jul 31, 202521.0621.3320.7720.9520.95-1.83%545,003
Jul 30, 202521.7021.8421.2321.3421.34-1.52%304,733