Amphastar Pharmaceuticals, Inc. (AMPH)

NASDAQ: AMPH · Real-Time Price · USD

21.78

+0.74 (3.52%)

At close: Jun 26, 2026, 4:00 PM EDT

21.78

0.00 (0.00%)

After-hours: Jun 26, 2026, 4:31 PM EDT

Amphastar Pharmaceuticals Stock Price History

Historical Data

Date	Open	High	Low	Close	Adj. Close	Change	Volume
Jun 26, 2026	21.01	21.81	20.88	21.78	21.78	3.52%	619,641
Jun 25, 2026	21.00	22.00	20.79	21.04	21.04	0.10%	481,265
Jun 24, 2026	19.77	21.09	19.77	21.02	21.02	7.63%	701,023
Jun 23, 2026	18.61	19.58	18.50	19.53	19.53	6.55%	660,867
Jun 22, 2026	18.80	18.90	18.22	18.33	18.33	-2.55%	767,365
Jun 18, 2026	19.51	19.66	18.70	18.81	18.81	-3.09%	1,326,960
Jun 17, 2026	19.94	20.26	19.15	19.41	19.41	-2.76%	1,008,517
Jun 16, 2026	19.91	20.41	19.62	19.96	19.96	1.27%	724,186
Jun 15, 2026	20.11	20.29	19.59	19.71	19.71	-1.89%	528,512
Jun 12, 2026	19.90	20.55	19.90	20.09	20.09	-2.14%	377,788
Jun 11, 2026	20.15	20.65	20.10	20.53	20.53	1.18%	463,541
Jun 10, 2026	20.21	20.77	19.99	20.29	20.29	0.64%	405,165
Jun 9, 2026	19.53	20.27	19.53	20.16	20.16	3.97%	506,256
Jun 8, 2026	19.75	19.85	19.34	19.39	19.39	-1.77%	558,989
Jun 5, 2026	18.86	20.14	18.85	19.74	19.74	5.56%	748,136
Jun 4, 2026	18.28	18.90	18.28	18.70	18.70	3.20%	459,231
Jun 3, 2026	18.26	18.36	17.73	18.12	18.12	-1.79%	509,321
Jun 2, 2026	18.36	18.67	18.10	18.45	18.45	0.16%	810,460
Jun 1, 2026	18.63	19.01	18.22	18.42	18.42	-2.28%	569,685
May 29, 2026	19.28	19.46	18.55	18.85	18.85	-2.33%	801,579
May 28, 2026	19.04	19.55	19.02	19.30	19.30	1.05%	621,213
May 27, 2026	19.31	19.34	18.50	19.10	19.10	1.54%	496,955
May 26, 2026	18.45	19.12	18.45	18.81	18.81	2.17%	670,766
May 22, 2026	18.25	18.44	17.93	18.41	18.41	1.38%	485,196
May 21, 2026	18.07	18.37	17.76	18.16	18.16	0.44%	1,599,202
May 20, 2026	17.81	18.19	17.70	18.08	18.08	1.46%	868,756
May 19, 2026	17.28	17.91	17.00	17.82	17.82	3.60%	725,146
May 18, 2026	16.70	17.31	16.65	17.20	17.20	1.96%	865,827
May 15, 2026	17.27	17.53	16.76	16.87	16.87	-2.49%	679,289
May 14, 2026	17.81	18.08	17.26	17.30	17.30	-5.57%	739,074
May 13, 2026	17.50	18.57	17.43	18.32	18.32	4.69%	971,189
May 12, 2026	18.41	18.58	17.26	17.50	17.50	-5.15%	1,219,603
May 11, 2026	19.13	19.41	18.33	18.45	18.45	-2.89%	1,359,763
May 8, 2026	18.58	19.53	18.28	19.00	19.00	-20.93%	1,983,804
May 7, 2026	24.01	24.35	23.87	24.03	24.03	0.54%	373,521
May 6, 2026	23.50	24.15	23.50	23.90	23.90	2.18%	392,763
May 5, 2026	22.85	23.46	22.75	23.39	23.39	2.86%	366,945
May 4, 2026	21.82	23.22	21.72	22.74	22.74	3.93%	487,139
May 1, 2026	21.98	22.26	21.64	21.88	21.88	-0.36%	353,190
Apr 30, 2026	21.63	22.36	21.57	21.96	21.96	1.53%	407,242
Apr 29, 2026	21.50	21.86	21.48	21.63	21.63	-0.87%	268,688
Apr 28, 2026	21.71	22.04	21.56	21.82	21.82	0.79%	281,225
Apr 27, 2026	21.47	22.06	21.46	21.65	21.65	1.12%	329,613
Apr 24, 2026	21.05	21.60	20.77	21.41	21.41	1.90%	429,703
Apr 23, 2026	20.99	21.23	20.77	21.01	21.01	0.10%	302,590
Apr 22, 2026	21.40	21.59	20.77	20.99	20.99	-1.04%	410,802
Apr 21, 2026	22.38	22.66	21.10	21.21	21.21	-7.46%	684,196
Apr 20, 2026	22.67	23.26	22.54	22.92	22.92	0.17%	542,349
Apr 17, 2026	22.18	23.00	21.98	22.88	22.88	4.91%	537,832
Apr 16, 2026	21.67	22.02	21.41	21.81	21.81	0.60%	361,313
Apr 15, 2026	21.38	21.76	21.19	21.68	21.68	1.40%	389,357
Apr 14, 2026	21.36	21.70	21.12	21.38	21.38	0.09%	343,451
Apr 13, 2026	20.17	21.48	20.17	21.36	21.36	4.86%	577,873
Apr 10, 2026	20.98	21.10	20.14	20.37	20.37	-2.40%	354,467
Apr 9, 2026	20.32	21.19	20.32	20.87	20.87	2.30%	519,316
Apr 8, 2026	20.68	21.07	20.18	20.40	20.40	-0.87%	613,466
Apr 7, 2026	20.39	20.81	20.26	20.58	20.58	-	351,463
Apr 6, 2026	20.45	20.73	20.04	20.58	20.58	0.64%	344,067
Apr 2, 2026	19.95	20.66	19.88	20.45	20.45	1.04%	390,454
Apr 1, 2026	19.74	20.31	19.68	20.24	20.24	3.32%	677,388
Mar 31, 2026	19.53	20.00	19.27	19.59	19.59	1.93%	534,427
Mar 30, 2026	19.15	19.67	19.07	19.22	19.22	1.10%	410,715
Mar 27, 2026	19.37	19.64	18.92	19.01	19.01	-2.66%	346,015
Mar 26, 2026	19.50	19.80	18.98	19.53	19.53	-0.20%	363,470
Mar 25, 2026	19.45	19.96	19.39	19.57	19.57	1.77%	317,563
Mar 24, 2026	19.10	19.57	18.98	19.23	19.23	-	367,780
Mar 23, 2026	20.04	20.08	19.23	19.23	19.23	-1.38%	414,859
Mar 20, 2026	19.56	19.76	19.15	19.50	19.50	-0.20%	1,133,239
Mar 19, 2026	19.10	19.82	19.06	19.54	19.54	2.84%	583,123
Mar 18, 2026	19.21	19.47	18.97	19.00	19.00	-2.61%	650,426
Mar 17, 2026	19.48	20.00	19.48	19.51	19.51	0.52%	635,572
Mar 16, 2026	18.93	19.46	18.65	19.41	19.41	6.77%	737,990
Mar 13, 2026	18.23	18.46	17.81	18.18	18.18	0.03%	604,648
Mar 12, 2026	18.58	18.58	17.03	18.18	18.18	-3.17%	901,683
Mar 11, 2026	18.91	19.50	18.52	18.77	18.77	-0.74%	548,285
Mar 10, 2026	19.21	19.57	18.84	18.91	18.91	-1.56%	527,204
Mar 9, 2026	18.97	19.37	18.52	19.21	19.21	-0.67%	687,763
Mar 6, 2026	20.05	20.08	18.94	19.34	19.34	-5.38%	753,758
Mar 5, 2026	19.67	20.60	19.54	20.44	20.44	2.40%	726,358
Mar 4, 2026	19.97	20.20	19.56	19.96	19.96	0.66%	594,999
Mar 3, 2026	20.35	21.07	19.81	19.83	19.83	-5.62%	740,834
Mar 2, 2026	20.30	21.14	19.95	21.01	21.01	3.86%	1,261,290
Feb 27, 2026	22.44	23.27	19.83	20.23	20.23	-23.63%	1,965,786
Feb 26, 2026	28.00	28.17	26.27	26.49	26.49	-5.29%	816,455
Feb 25, 2026	27.73	27.99	27.03	27.97	27.97	1.08%	415,986
Feb 24, 2026	27.65	28.37	27.42	27.67	27.67	0.44%	478,146
Feb 23, 2026	28.42	28.75	27.19	27.55	27.55	-3.43%	496,697
Feb 20, 2026	28.58	28.98	28.03	28.53	28.53	-0.04%	508,412
Feb 19, 2026	28.56	28.71	28.42	28.54	28.54	-0.42%	340,673
Feb 18, 2026	28.45	29.16	28.36	28.66	28.66	0.74%	325,939
Feb 17, 2026	28.65	29.23	28.39	28.45	28.45	-0.18%	316,867
Feb 13, 2026	27.82	29.00	27.76	28.50	28.50	3.45%	268,689
Feb 12, 2026	28.62	28.62	27.24	27.55	27.55	-3.64%	437,541
Feb 11, 2026	28.62	29.09	28.48	28.59	28.59	0.07%	236,616
Feb 10, 2026	28.75	28.92	28.49	28.57	28.57	-0.14%	182,574
Feb 9, 2026	29.08	29.20	28.37	28.61	28.61	-2.22%	285,022
Feb 6, 2026	28.61	29.46	28.61	29.26	29.26	2.20%	343,842
Feb 5, 2026	28.45	29.22	28.45	28.63	28.63	0.07%	288,034
Feb 4, 2026	28.79	29.37	28.56	28.61	28.61	1.31%	378,851
Feb 3, 2026	27.57	28.28	27.06	28.24	28.24	1.15%	506,290