Amphastar Pharmaceuticals, Inc. (AMPH)

NASDAQ: AMPH · Real-Time Price · USD

19.94

-0.44 (-2.16%)

At close: Jul 31, 2026, 4:00 PM EDT

20.28

+0.34 (1.71%)

After-hours: Jul 31, 2026, 7:46 PM EDT

Amphastar Pharmaceuticals Stock Price History

Historical Data

Date	Open	High	Low	Close	Adj. Close	Change	Volume
Jul 31, 2026	20.35	20.41	19.67	19.94	19.94	-2.16%	367,423
Jul 30, 2026	20.31	20.53	19.95	20.38	20.38	-0.97%	355,683
Jul 29, 2026	20.24	20.70	19.99	20.58	20.58	2.13%	321,443
Jul 28, 2026	19.38	20.27	19.38	20.15	20.15	5.06%	390,836
Jul 27, 2026	18.97	19.31	18.96	19.18	19.18	2.46%	285,916
Jul 24, 2026	18.90	19.12	18.50	18.72	18.72	-0.79%	445,682
Jul 23, 2026	19.08	19.34	18.73	18.87	18.87	-2.23%	650,429
Jul 22, 2026	19.71	19.95	19.20	19.30	19.30	-1.48%	409,241
Jul 21, 2026	19.42	19.89	19.42	19.59	19.59	-0.20%	620,355
Jul 20, 2026	19.78	19.91	19.52	19.63	19.63	-0.58%	437,415
Jul 17, 2026	19.84	20.35	19.63	19.75	19.75	-0.58%	338,456
Jul 16, 2026	19.40	20.14	19.40	19.86	19.86	2.37%	416,837
Jul 15, 2026	18.87	19.50	18.83	19.40	19.40	3.16%	356,066
Jul 14, 2026	19.10	19.39	18.41	18.81	18.81	-2.51%	334,746
Jul 13, 2026	19.00	19.68	18.95	19.29	19.29	3.04%	384,388
Jul 10, 2026	18.97	19.15	18.61	18.72	18.72	-1.58%	311,036
Jul 9, 2026	18.86	19.13	18.61	19.02	19.02	0.74%	445,978
Jul 8, 2026	19.96	19.96	18.52	18.88	18.88	-5.98%	438,663
Jul 7, 2026	20.06	20.28	19.74	20.08	20.08	2.40%	449,984
Jul 6, 2026	19.48	20.01	19.08	19.61	19.61	-0.15%	313,781
Jul 2, 2026	20.35	20.35	19.63	19.64	19.64	-2.29%	315,753
Jul 1, 2026	20.32	20.54	19.91	20.10	20.10	-0.40%	422,109
Jun 30, 2026	20.71	20.71	19.86	20.18	20.18	-2.56%	400,207
Jun 29, 2026	21.12	21.24	19.66	20.71	20.71	-4.91%	727,089
Jun 26, 2026	21.01	21.81	20.88	21.78	21.78	3.52%	623,977
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%	701,214
Jun 23, 2026	18.61	19.58	18.50	19.53	19.53	6.55%	660,872
Jun 22, 2026	18.80	18.90	18.22	18.33	18.33	-2.55%	767,439
Jun 18, 2026	19.51	19.66	18.70	18.81	18.81	-3.09%	1,327,603
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%	724,208
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%	463,562
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%	750,284
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%	509,338
Jun 2, 2026	18.36	18.67	18.10	18.45	18.45	0.16%	810,643
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%	849,067
May 28, 2026	19.04	19.55	19.02	19.30	19.30	1.05%	621,218
May 27, 2026	19.31	19.34	18.50	19.10	19.10	1.54%	501,594
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%	485,197
May 21, 2026	18.07	18.37	17.76	18.16	18.16	0.44%	1,656,978
May 20, 2026	17.81	18.19	17.70	18.08	18.08	1.46%	868,756