Amphastar Pharmaceuticals Stock Price History

Historical Data

Date	Open	High	Low	Close	Adj. Close	Change	Volume
Aug 21, 2026	21.64	22.20	21.44	21.60	21.60	-0.37%	376,557
Aug 20, 2026	21.38	21.76	21.24	21.68	21.68	-0.28%	338,696
Aug 19, 2026	21.64	21.99	21.15	21.74	21.74	1.87%	410,758
Aug 18, 2026	21.11	21.59	21.08	21.34	21.34	2.30%	411,799
Aug 17, 2026	20.90	21.23	20.77	20.86	20.86	-0.24%	533,504
Aug 14, 2026	20.02	21.07	19.89	20.91	20.91	3.62%	305,681
Aug 13, 2026	20.18	20.27	19.84	20.18	20.18	1.00%	307,442
Aug 12, 2026	20.16	20.22	19.61	19.98	19.98	-2.15%	337,108
Aug 11, 2026	20.00	20.57	20.00	20.42	20.42	0.54%	361,823
Aug 10, 2026	20.74	20.90	19.55	20.31	20.31	-2.26%	645,738
Aug 7, 2026	22.48	22.65	20.40	20.78	20.78	4.90%	1,299,876
Aug 6, 2026	20.22	20.25	19.60	19.81	19.81	-2.12%	526,642
Aug 5, 2026	20.06	20.28	19.88	20.24	20.24	1.71%	351,591
Aug 4, 2026	20.11	20.38	19.86	19.90	19.90	-1.58%	481,599
Aug 3, 2026	20.11	20.46	19.70	20.22	20.22	1.40%	413,175
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