Skip to main content
logo
Amphastar Pharmaceuticals, Inc. (AMPH)
NASDAQ: AMPH · Real-Time Price · USD
25.14
-0.90 (-3.46%)
At close: Oct 23, 2026, 4:00 PM EDT
24.90
-0.24 (-0.95%)
After-hours: Oct 23, 2026, 7:30 PM EDT

Amphastar Pharmaceuticals Stock Price History

Historical Data

DateOpenHighLowCloseAdj. CloseChangeVolume
Oct 23, 202625.9125.9124.6225.1425.14-3.46%482,286
Oct 22, 202626.2526.5025.9226.0426.04-0.61%315,001
Oct 21, 202625.6926.3525.5126.2026.201.00%390,199
Oct 20, 202626.2426.6125.8225.9425.94-0.77%360,167
Oct 19, 202625.6326.3125.6326.1426.141.04%299,509
Oct 16, 202626.6126.6125.5225.8725.87-2.08%351,983
Oct 15, 202626.3827.1026.1326.4226.421.30%352,334
Oct 14, 202625.8926.5725.8926.0826.080.12%364,651
Oct 13, 202626.9127.0026.0326.0526.05-2.65%326,542
Oct 12, 202626.6226.8626.5126.7626.760.53%362,817
Oct 9, 202625.7326.7925.6526.6226.623.14%269,255
Oct 8, 202625.3926.1425.1025.8125.811.06%422,785
Oct 7, 202625.9126.1725.2925.5425.54-1.43%774,800
Oct 6, 202625.5426.1325.0325.9125.912.13%466,112
Oct 5, 202625.4325.7025.1725.3725.37-0.24%453,634
Oct 2, 202625.4625.5525.0625.4325.430.32%372,329
Oct 1, 202625.6026.0225.3025.3525.35-1.78%528,692
Sep 30, 202626.7326.7925.7725.8125.81-3.26%504,650
Sep 29, 202627.5927.6426.5226.6826.68-2.59%626,940
Sep 28, 202625.9927.8025.9627.3927.394.82%747,864
Sep 25, 202626.2526.6325.6626.1326.13-0.53%370,895
Sep 24, 202624.8126.3124.6526.2726.275.25%568,856
Sep 23, 202624.3925.1224.2024.9624.962.63%504,549
Sep 22, 202624.6024.8324.0024.3224.32-0.65%496,729
Sep 21, 202623.5425.4123.4524.4824.483.64%563,475
Sep 18, 202623.6923.9923.5123.6223.62-0.84%1,450,179
Sep 17, 202624.0824.1823.5023.8223.82-0.54%451,995
Sep 16, 202623.6424.3923.4923.9523.951.31%502,992
Sep 15, 202623.7523.9423.5623.6423.64-1.13%347,395
Sep 14, 202623.8424.2823.5623.9123.910.55%471,954
Sep 11, 202623.6523.8023.2423.7823.781.02%400,728
Sep 10, 202623.0023.6922.7623.5423.542.17%495,998
Sep 9, 202622.8423.0722.5823.0423.040.48%343,406
Sep 8, 202622.8223.1422.3022.9322.93-1.08%451,310
Sep 4, 202623.4723.7423.0723.1823.18-2.77%626,116
Sep 3, 202623.8823.9223.0423.8423.840.42%391,242
Sep 2, 202623.0523.8323.0323.7423.743.40%436,695
Sep 1, 202622.5923.0522.5922.9622.961.91%349,054
Aug 31, 202621.8622.6521.5222.5322.532.36%271,824
Aug 28, 202621.8822.1521.6922.0122.010.59%224,528
Aug 27, 202621.6921.9721.6321.8821.88-0.64%247,746
Aug 26, 202621.8622.4421.7222.0222.020.18%395,567
Aug 25, 202621.5022.0721.4121.9821.982.14%283,723
Aug 24, 202621.6021.8121.2621.5221.52-0.37%209,562
Aug 21, 202621.6422.2021.4421.6021.60-0.37%376,557
Aug 20, 202621.3821.7621.2421.6821.68-0.28%338,696
Aug 19, 202621.6421.9921.1521.7421.741.87%410,758
Aug 18, 202621.1121.5921.0821.3421.342.30%411,799
Aug 17, 202620.9021.2320.7720.8620.86-0.24%533,504
Aug 14, 202620.0221.0719.8920.9120.913.62%305,681