NASDAQ:AMPH | Historical Stock Price | Amphastar Pharmaceuticals, Inc.

Complete retained daily price history on its own workbook tab. Split-adjusted close keeps every historical share price on one comparable split basis. Cumulative dividend-reinvested close is the daily close of a rebased total-return index: it starts with one share at the earliest retained close, reinvests every distribution, and normalizes every forward and reverse split exactly once. Admitted exchange opening prices remain a distinct current-session series.

Available history
2014-06-25 to 2026-09-04
Data captured

Stock Price Chart

Blue: Split-adjusted close · Orange: Cumulative dividend-reinvested close

$8.31$12.59$19.07$28.88$43.73$66.232014-06-252026-08-27

Logarithmic scale. Both lines share the same starting value for the selected range.

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Historical Stock Price — 2019

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2019-12-31$19.29$19.29221,600——
2019-12-30$19.22$19.22121,200——
2019-12-27$19.20$19.20116,800——
2019-12-26$19.45$19.45100,200——
2019-12-24$19.64$19.6464,700——
2019-12-23$19.45$19.45178,000——
2019-12-20$19.62$19.621,077,800——
2019-12-19$19.62$19.62150,100——
2019-12-18$19.12$19.12176,900——
2019-12-17$19.37$19.3798,900——
2019-12-16$19.34$19.34209,800——
2019-12-13$19.33$19.33156,800——
2019-12-12$19.48$19.48221,400——
2019-12-11$19.38$19.38136,400——
2019-12-10$19.20$19.20119,800——
2019-12-09$19.15$19.15252,800——
2019-12-06$18.92$18.92311,300——
2019-12-05$19.03$19.03330,300——
2019-12-04$18.98$18.98258,100——
2019-12-03$19.03$19.03948,300——
2019-12-02$19.04$19.04285,900——
2019-11-29$19.51$19.51361,700——
2019-11-27$18.64$18.64103,600——
2019-11-26$18.27$18.27181,000——
2019-11-25$18.74$18.74224,400——
2019-11-22$18.01$18.01222,600——
2019-11-21$18.04$18.04154,600——
2019-11-20$18.07$18.07328,300——
2019-11-19$18.25$18.25297,600——
2019-11-18$17.58$17.58215,900——
2019-11-15$17.22$17.22172,900——
2019-11-14$17.07$17.07179,600——
2019-11-13$17.25$17.25207,100——
2019-11-12$17.63$17.63383,800——
2019-11-11$17.35$17.35298,600——
2019-11-08$18.41$18.41600,800——
2019-11-07$19.12$19.12128,800——
2019-11-06$19.08$19.08155,400——
2019-11-05$19.44$19.44138,900——
2019-11-04$19.38$19.38145,700——
2019-11-01$19.56$19.56228,800——
2019-10-31$19.32$19.32225,100——
2019-10-30$19.64$19.64158,800——
2019-10-29$19.96$19.96243,700——
2019-10-28$19.65$19.65134,600——
2019-10-25$19.52$19.52129,100——
2019-10-24$19.53$19.53115,400——
2019-10-23$19.95$19.95202,800——
2019-10-22$19.96$19.96110,400——
2019-10-21$19.99$19.99171,700——
2019-10-18$19.93$19.93220,500——
2019-10-17$20.52$20.52154,900——
2019-10-16$20.64$20.64136,200——
2019-10-15$20.46$20.46172,900——
2019-10-14$20.16$20.16173,700——
2019-10-11$19.77$19.77146,500——
2019-10-10$19.58$19.58108,000——
2019-10-09$19.67$19.67130,200——
2019-10-08$19.75$19.75122,000——
2019-10-07$19.92$19.92150,900——
2019-10-04$19.79$19.79111,200——
2019-10-03$19.61$19.61147,000——
2019-10-02$19.23$19.23177,800——
2019-10-01$19.65$19.65169,400——
2019-09-30$19.83$19.83231,800——
2019-09-27$20.22$20.22149,000——
2019-09-26$20.06$20.06162,000——
2019-09-25$20.40$20.40338,700——
2019-09-24$20.23$20.23202,000——
2019-09-23$20.43$20.43186,700——
2019-09-20$20.73$20.73733,200——
2019-09-19$20.97$20.97180,600——
2019-09-18$21.22$21.22192,200——
2019-09-17$21.74$21.74176,900——
2019-09-16$21.81$21.81248,500——
2019-09-13$21.52$21.52181,000——
2019-09-12$21.62$21.62262,500——
2019-09-11$22.15$22.15209,500——
2019-09-10$21.95$21.95284,600——
2019-09-09$21.29$21.29179,000——
2019-09-06$21.62$21.62230,000——
2019-09-05$21.24$21.24378,000——
2019-09-04$21.72$21.72792,000——
2019-09-03$21.95$21.95403,700——
2019-08-30$22.46$22.46377,500——
2019-08-29$22.00$22.00101,300——
2019-08-28$21.69$21.69141,500——
2019-08-27$21.85$21.85166,200——
2019-08-26$22.50$22.50194,300——
2019-08-23$22.24$22.24261,300——
2019-08-22$22.56$22.56191,300——
2019-08-21$22.62$22.62210,300——
2019-08-20$22.19$22.19303,400——
2019-08-19$22.11$22.11280,800——
2019-08-16$21.38$21.38294,600——
2019-08-15$20.90$20.90222,500——
2019-08-14$20.85$20.85274,400——
2019-08-13$20.85$20.85169,100——
2019-08-12$20.64$20.64224,000——
2019-08-09$20.64$20.64210,200——
2019-08-08$21.07$21.07294,900——
2019-08-07$19.69$19.69135,300——
2019-08-06$19.57$19.57134,400——
2019-08-05$19.36$19.36146,300——
2019-08-02$19.87$19.87140,600——
2019-08-01$20.07$20.07178,600——
2019-07-31$20.15$20.15213,000——
2019-07-30$20.32$20.32209,200——
2019-07-29$19.91$19.91112,300——
2019-07-26$19.72$19.72160,400——
2019-07-25$19.81$19.81199,700——
2019-07-24$19.56$19.56252,300——
2019-07-23$19.12$19.12149,100——
2019-07-22$19.23$19.2399,200——
2019-07-19$19.38$19.38141,600——
2019-07-18$19.95$19.9591,200——
2019-07-17$20.03$20.0381,300——
2019-07-16$20.09$20.09142,300——
2019-07-15$20.19$20.1970,600——
2019-07-12$20.20$20.20132,400——
2019-07-11$20.01$20.01105,500——
2019-07-10$20.42$20.42119,800——
2019-07-09$20.29$20.29129,800——
2019-07-08$20.33$20.33185,800——
2019-07-05$20.88$20.8887,700——
2019-07-03$21.13$21.1379,800——
2019-07-02$21.08$21.08201,000——
2019-07-01$21.43$21.43212,200——
2019-06-28$21.11$21.111,012,200——
2019-06-27$20.85$20.85106,800——
2019-06-26$20.43$20.43145,400——
2019-06-25$20.47$20.47127,900——
2019-06-24$20.22$20.22183,300——
2019-06-21$20.64$20.64217,900——
2019-06-20$20.81$20.8185,200——
2019-06-19$20.82$20.8284,300——
2019-06-18$20.56$20.56100,200——
2019-06-17$20.27$20.27173,800——
2019-06-14$19.82$19.8299,300——
2019-06-13$20.00$20.00129,700——
2019-06-12$20.03$20.03140,700——
2019-06-11$19.55$19.55141,800——
2019-06-10$20.17$20.17141,700——
2019-06-07$20.11$20.11318,200——
2019-06-06$20.11$20.11249,500——
2019-06-05$19.71$19.71253,200——
2019-06-04$19.65$19.65910,200——
2019-06-03$18.92$18.92308,700——
2019-05-31$19.25$19.25405,400——
2019-05-30$19.87$19.87114,400——
2019-05-29$20.18$20.18134,700——
2019-05-28$20.50$20.50149,100——
2019-05-24$21.21$21.2197,700——
2019-05-23$20.90$20.90144,700——
2019-05-22$21.17$21.1789,900——
2019-05-21$21.47$21.4789,400——
2019-05-20$21.32$21.32125,400——
2019-05-17$21.92$21.92115,600——
2019-05-16$22.28$22.28248,200——
2019-05-15$21.21$21.2192,800——
2019-05-14$21.01$21.01127,800——
2019-05-13$20.88$20.88235,700——
2019-05-10$22.41$22.41188,200——
2019-05-09$22.63$22.63134,900——
2019-05-08$22.51$22.51126,200——
2019-05-07$22.29$22.29154,000——
2019-05-06$22.96$22.96197,300——
2019-05-03$22.35$22.35141,500——
2019-05-02$21.92$21.9288,700——
2019-05-01$21.65$21.65334,500——
2019-04-30$21.59$21.59137,100——
2019-04-29$21.77$21.7799,200——
2019-04-26$21.59$21.59121,900——
2019-04-25$21.33$21.33100,400——
2019-04-24$20.81$20.8175,100——
2019-04-23$20.80$20.80102,500——
2019-04-22$20.45$20.45155,300——
2019-04-18$20.16$20.16105,900——
2019-04-17$19.92$19.92228,700——
2019-04-16$20.58$20.5890,000——
2019-04-15$20.80$20.8087,600——
2019-04-12$20.72$20.7299,500——
2019-04-11$20.97$20.9786,700——
2019-04-10$21.04$21.04128,200——
2019-04-09$20.95$20.95115,000——
2019-04-08$21.35$21.3579,600——
2019-04-05$21.39$21.39372,100——
2019-04-04$21.31$21.31132,700——
2019-04-03$20.90$20.90142,100——
2019-04-02$21.34$21.34166,100——
2019-04-01$21.05$21.05311,800——
2019-03-29$20.43$20.43164,000——
2019-03-28$20.44$20.44128,100——
2019-03-27$20.52$20.52116,800——
2019-03-26$20.54$20.54106,500——
2019-03-25$20.44$20.44133,000——
2019-03-22$20.16$20.16257,100——
2019-03-21$20.81$20.81195,500——
2019-03-20$20.94$20.94346,300——
2019-03-19$20.61$20.61206,000——
2019-03-18$20.37$20.37258,300——
2019-03-15$20.23$20.23663,700——
2019-03-14$20.50$20.50398,400——
2019-03-13$20.68$20.681,099,000——
2019-03-12$24.17$24.17140,500——
2019-03-11$23.72$23.72191,700——
2019-03-08$23.81$23.81117,900——
2019-03-07$23.83$23.83196,900——
2019-03-06$24.17$24.17161,100——
2019-03-05$24.73$24.73100,500——
2019-03-04$24.73$24.73255,600——
2019-03-01$25.28$25.28355,700——
2019-02-28$24.85$24.85263,500——
2019-02-27$24.51$24.51160,800——
2019-02-26$24.18$24.18390,700——
2019-02-25$23.90$23.90163,200——
2019-02-22$24.14$24.14159,400——
2019-02-21$24.19$24.19104,600——
2019-02-20$24.61$24.61244,300——
2019-02-19$24.31$24.31104,900——
2019-02-15$24.38$24.38197,800——
2019-02-14$23.85$23.85170,400——
2019-02-13$23.83$23.8371,400——
2019-02-12$23.86$23.86263,900——
2019-02-11$23.35$23.35114,700——
2019-02-08$22.96$22.96117,500——
2019-02-07$22.87$22.8773,900——
2019-02-06$22.96$22.9699,900——
2019-02-05$23.15$23.15164,600——
2019-02-04$22.79$22.79142,600——
2019-02-01$22.50$22.50100,000——
2019-01-31$22.76$22.76171,400——
2019-01-30$22.24$22.2489,000——
2019-01-29$22.08$22.0862,800——
2019-01-28$21.88$21.88107,000——
2019-01-25$22.40$22.40107,500——
2019-01-24$22.02$22.0294,600——
2019-01-23$22.60$22.60288,600——
2019-01-22$22.39$22.39232,200——
2019-01-18$21.94$21.94105,100——
2019-01-17$22.08$22.08171,200——
2019-01-16$21.78$21.78111,700——
2019-01-15$21.88$21.88110,900——
2019-01-14$21.31$21.31156,300——
2019-01-11$22.11$22.11249,200——
2019-01-10$21.94$21.94192,000——
2019-01-09$21.40$21.40261,700——
2019-01-08$20.90$20.90208,800——
2019-01-07$20.74$20.74187,700——
2019-01-04$20.63$20.63261,300——
2019-01-03$19.46$19.46201,900——
2019-01-02$19.76$19.76188,100——