Amphastar Pharmaceuticals, Inc. (AMPH)

NASDAQ: AMPH · Real-Time Price · USD

18.36

-0.45 (-2.39%)

At close: Jun 22, 2026, 4:00 PM EDT

18.33

-0.03 (-0.16%)

After-hours: Jun 22, 2026, 6:05 PM EDT

Amphastar Pharmaceuticals Stock Price History

Historical Data

Date	Open	High	Low	Close	Adj. Close	Change	Volume
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