Amphastar Pharmaceuticals, Inc. (AMPH) NASDAQ

Currency In USD

AMPH Historical Return

If you invested $1000 in Amphastar Pharmaceuticals, Inc. (AMPH) 10 years ago, it would be worth $1,188.92 as of June 22, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $917.59, while $1000 invested 1 year ago would be worth $751.03. This corresponds to total returns of 18.89%, -8.24%, -24.9%, respectively, with annualized returns of 1.74%, -1.7%, -24.9%.

Custom investment amounts or purchase dates can also be explored using the Stoculator calculator. Past performance does not guarantee future results.

AMPH Historical Data

Date Range:

Date	Open	Close	Adj Close	High	Low	Volume
June 18, 2026	19.51	18.81	18.81	19.66	18.7	1.33M
June 17, 2026	19.94	19.41	19.41	20.26	19.15	1.01M
June 16, 2026	19.91	19.96	19.96	20.41	19.61	724,186
June 15, 2026	20.11	19.71	19.71	20.29	19.59	586,137
June 12, 2026	19.9	20.09	20.09	20.55	19.9	377,788
June 11, 2026	20.15	20.53	20.53	20.65	20.1	463,541
June 10, 2026	20.21	20.29	20.29	20.77	19.99	405,165
June 09, 2026	19.53	20.16	20.16	20.27	19.53	506,256
June 08, 2026	19.75	19.39	19.39	19.85	19.34	558,989
June 05, 2026	18.86	19.74	19.74	20.14	18.85	748,242
June 04, 2026	18.28	18.7	18.7	18.9	18.28	459,231
June 03, 2026	18.26	18.12	18.12	18.36	17.73	492,109
June 02, 2026	18.36	18.45	18.45	18.67	18.1	810,460
June 01, 2026	18.63	18.42	18.42	19.01	18.22	569,685
May 29, 2026	19.28	18.85	18.85	19.46	18.55	848,896
May 28, 2026	19.04	19.3	19.3	19.55	19.02	621,213
May 27, 2026	19.31	19.1	19.1	19.34	18.5	497,079
May 26, 2026	18.45	18.81	18.81	19.12	18.45	670,766
May 22, 2026	18.25	18.41	18.41	18.44	17.93	485,196
May 21, 2026	18.07	18.16	18.16	18.37	17.76	1.66M
May 20, 2026	17.81	18.08	18.08	18.18	17.7	868,756
May 19, 2026	17.28	17.82	17.82	17.91	17	725,146
May 18, 2026	16.7	17.2	17.2	17.31	16.65	866,025
May 15, 2026	17.27	16.87	16.87	17.53	16.76	679,269
May 14, 2026	17.81	17.3	17.3	18.08	17.26	739,064
May 13, 2026	17.5	18.32	18.32	18.57	17.43	971,189
May 12, 2026	18.41	17.5	17.5	18.61	17.26	1.22M
May 11, 2026	19.13	18.45	18.45	19.41	18.33	1.3M
May 08, 2026	18.58	19	19	19.52	18.28	1.98M
May 07, 2026	24.01	24.03	24.03	24.35	23.87	367,601
May 06, 2026	23.5	23.9	23.9	24.15	23.5	392,762
May 05, 2026	22.85	23.39	23.39	23.46	22.75	414,985
May 04, 2026	21.82	22.74	22.74	23.22	21.72	487,139
May 01, 2026	21.98	21.88	21.88	22.26	21.64	300,350
April 30, 2026	21.63	21.96	21.96	22.36	21.57	407,242
April 29, 2026	21.5	21.63	21.63	21.86	21.48	268,688
April 28, 2026	21.71	21.82	21.82	22.04	21.56	281,225
April 27, 2026	21.47	21.65	21.65	22.06	21.46	254,673
April 24, 2026	21.05	21.41	21.41	21.6	20.77	402,069
April 23, 2026	20.99	21.01	21.01	21.23	20.77	302,570
April 22, 2026	21.4	20.99	20.99	21.59	20.77	410,802
April 21, 2026	22.38	21.21	21.21	22.64	21.1	675,111
April 20, 2026	22.67	22.92	22.92	23.26	22.54	535,020
April 17, 2026	22.18	22.88	22.88	23	21.98	537,820
April 16, 2026	21.67	21.81	21.81	22.02	21.41	361,306
April 15, 2026	21.38	21.68	21.68	21.76	21.19	389,107
April 14, 2026	21.36	21.38	21.38	21.7	21.12	343,451
April 13, 2026	20.17	21.36	21.36	21.48	20.17	577,853
April 10, 2026	20.98	20.37	20.37	21.1	20.14	354,456
April 09, 2026	20.32	20.87	20.87	21.19	20.32	519,311
April 08, 2026	20.68	20.4	20.4	21.07	20.18	613,453
April 07, 2026	20.39	20.58	20.58	20.81	20.26	351,500
April 06, 2026	20.45	20.58	20.58	20.73	20.24	334,787
April 02, 2026	19.95	20.45	20.45	20.66	19.88	390,453
April 01, 2026	19.74	20.24	20.24	20.31	19.68	676,874
March 31, 2026	19.53	19.59	19.59	20	19.27	534,127
March 30, 2026	19.15	19.22	19.22	19.67	19.07	410,715
March 27, 2026	19.37	19.01	19.01	19.64	18.92	343,413
March 26, 2026	19.5	19.53	19.53	19.8	18.98	363,470
March 25, 2026	19.45	19.57	19.57	19.96	19.39	317,553