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 — 2020

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2020-12-31$20.11$20.11124,200——
2020-12-30$19.85$19.85217,300——
2020-12-29$19.81$19.81373,700——
2020-12-28$19.02$19.02148,100——
2020-12-24$19.14$19.14100,200——
2020-12-23$18.88$18.88110,900——
2020-12-22$18.86$18.86123,200——
2020-12-21$18.82$18.82146,900——
2020-12-18$18.96$18.96766,200——
2020-12-17$18.20$18.20218,800——
2020-12-16$18.36$18.36146,700——
2020-12-15$18.84$18.84222,900——
2020-12-14$18.85$18.85163,700——
2020-12-11$18.69$18.69230,500——
2020-12-10$19.29$19.29196,800——
2020-12-09$18.89$18.89228,300——
2020-12-08$18.81$18.81149,700——
2020-12-07$18.57$18.57154,300——
2020-12-04$18.95$18.95176,900——
2020-12-03$18.54$18.54341,900——
2020-12-02$17.82$17.82179,400——
2020-12-01$17.94$17.94366,900——
2020-11-30$17.76$17.76257,000——
2020-11-27$18.12$18.12140,600——
2020-11-25$17.87$17.87298,000——
2020-11-24$18.01$18.01188,900——
2020-11-23$17.92$17.92205,400——
2020-11-20$18.36$18.36247,800——
2020-11-19$18.32$18.32157,700——
2020-11-18$18.56$18.56198,100——
2020-11-17$19.24$19.24290,300——
2020-11-16$19.52$19.52256,800——
2020-11-13$19.37$19.37263,100——
2020-11-12$19.22$19.22225,000——
2020-11-11$19.54$19.54172,200——
2020-11-10$19.78$19.78191,600——
2020-11-09$19.01$19.01243,300——
2020-11-06$19.20$19.20248,300——
2020-11-05$20.63$20.63126,000——
2020-11-04$20.74$20.74138,900——
2020-11-03$20.37$20.37115,300——
2020-11-02$19.90$19.90164,900——
2020-10-30$19.59$19.59164,200——
2020-10-29$20.09$20.09157,800——
2020-10-28$19.54$19.54206,900——
2020-10-27$19.88$19.88102,000——
2020-10-26$20.29$20.29139,400——
2020-10-23$20.84$20.84117,100——
2020-10-22$20.59$20.59120,100——
2020-10-21$20.41$20.41110,400——
2020-10-20$20.63$20.63124,300——
2020-10-19$20.82$20.82118,400——
2020-10-16$20.96$20.96125,400——
2020-10-15$20.97$20.97101,300——
2020-10-14$20.86$20.8692,500——
2020-10-13$21.10$21.10197,600——
2020-10-12$21.23$21.23115,600——
2020-10-09$21.24$21.24129,200——
2020-10-08$20.92$20.92145,400——
2020-10-07$20.44$20.44189,500——
2020-10-06$20.21$20.21185,500——
2020-10-05$20.14$20.14234,300——
2020-10-02$19.00$19.00197,200——
2020-10-01$19.04$19.04179,000——
2020-09-30$18.75$18.75228,800——
2020-09-29$18.63$18.63246,000——
2020-09-28$18.51$18.51173,100——
2020-09-25$18.03$18.03227,100——
2020-09-24$17.99$17.99171,100——
2020-09-23$18.18$18.18150,600——
2020-09-22$18.53$18.53149,700——
2020-09-21$18.79$18.79199,600——
2020-09-18$19.57$19.57714,000——
2020-09-17$19.45$19.45173,300——
2020-09-16$19.49$19.49176,500——
2020-09-15$19.50$19.50186,700——
2020-09-14$19.65$19.65196,100——
2020-09-11$19.42$19.42174,200——
2020-09-10$19.47$19.47189,900——
2020-09-09$20.00$20.00216,800——
2020-09-08$19.81$19.81397,600——
2020-09-04$19.92$19.92131,800——
2020-09-03$20.06$20.06274,400——
2020-09-02$20.28$20.28184,800——
2020-09-01$19.80$19.80222,600——
2020-08-31$20.38$20.38219,600——
2020-08-28$20.40$20.40121,800——
2020-08-27$20.31$20.31164,600——
2020-08-26$20.30$20.30132,500——
2020-08-25$20.22$20.22142,200——
2020-08-24$20.12$20.12175,400——
2020-08-21$20.03$20.03192,300——
2020-08-20$20.42$20.42125,600——
2020-08-19$20.51$20.51177,700——
2020-08-18$20.34$20.34128,600——
2020-08-17$20.49$20.49155,900——
2020-08-14$20.34$20.34169,100——
2020-08-13$20.40$20.40157,400——
2020-08-12$20.27$20.27222,900——
2020-08-11$19.89$19.89283,100——
2020-08-10$20.32$20.32305,800——
2020-08-07$20.14$20.14258,000——
2020-08-06$20.27$20.27316,700——
2020-08-05$21.09$21.09413,100——
2020-08-04$20.85$20.85255,300——
2020-08-03$20.74$20.74245,300——
2020-07-31$20.02$20.02284,000——
2020-07-30$20.35$20.35215,600——
2020-07-29$20.29$20.29204,000——
2020-07-28$19.99$19.99122,900——
2020-07-27$20.20$20.20100,200——
2020-07-24$19.98$19.98110,800——
2020-07-23$20.39$20.39176,200——
2020-07-22$20.63$20.63211,800——
2020-07-21$21.23$21.23342,800——
2020-07-20$20.93$20.93226,500——
2020-07-17$21.25$21.25202,400——
2020-07-16$20.69$20.69313,800——
2020-07-15$20.69$20.69218,900——
2020-07-14$20.27$20.27500,500——
2020-07-13$19.75$19.75279,100——
2020-07-10$20.34$20.34411,100——
2020-07-09$20.82$20.82302,000——
2020-07-08$21.50$21.50177,500——
2020-07-07$21.56$21.56226,500——
2020-07-06$21.98$21.98291,100——
2020-07-02$21.92$21.92252,800——
2020-07-01$22.22$22.22195,700——
2020-06-30$22.46$22.46278,000——
2020-06-29$22.12$22.12310,600——
2020-06-26$21.57$21.57414,500——
2020-06-25$21.85$21.85344,100——
2020-06-24$21.31$21.31292,200——
2020-06-23$21.54$21.54348,200——
2020-06-22$21.34$21.34326,700——
2020-06-19$21.01$21.01698,600——
2020-06-18$20.30$20.30168,200——
2020-06-17$20.02$20.02238,400——
2020-06-16$20.20$20.20357,900——
2020-06-15$19.94$19.94241,900——
2020-06-12$19.58$19.58341,700——
2020-06-11$19.65$19.65512,800——
2020-06-10$20.12$20.12343,300——
2020-06-09$20.55$20.55689,200——
2020-06-08$20.08$20.08451,900——
2020-06-05$19.52$19.52488,900——
2020-06-04$19.19$19.19297,800——
2020-06-03$18.92$18.92347,300——
2020-06-02$18.84$18.84325,500——
2020-06-01$19.05$19.05330,200——
2020-05-29$18.64$18.64329,400——
2020-05-28$18.62$18.62443,000——
2020-05-27$18.79$18.79579,500——
2020-05-26$18.49$18.49387,100——
2020-05-22$18.54$18.54328,100——
2020-05-21$18.47$18.47563,100——
2020-05-20$18.36$18.36456,600——
2020-05-19$18.77$18.77383,000——
2020-05-18$18.84$18.84585,800——
2020-05-15$18.18$18.181,317,000——
2020-05-14$17.98$17.98375,300——
2020-05-13$18.50$18.50344,200——
2020-05-12$18.53$18.53436,400——
2020-05-11$19.18$19.18319,000——
2020-05-08$18.79$18.79404,000——
2020-05-07$17.60$17.60256,400——
2020-05-06$17.33$17.33215,200——
2020-05-05$17.22$17.22293,800——
2020-05-04$17.25$17.25199,400——
2020-05-01$16.82$16.82247,600——
2020-04-30$16.95$16.95240,400——
2020-04-29$17.43$17.43262,300——
2020-04-28$17.12$17.12250,500——
2020-04-27$17.98$17.98355,900——
2020-04-24$16.73$16.73159,600——
2020-04-23$16.56$16.56237,600——
2020-04-22$16.40$16.40191,500——
2020-04-21$16.01$16.01172,200——
2020-04-20$16.61$16.61201,000——
2020-04-17$16.34$16.34187,900——
2020-04-16$15.99$15.99329,500——
2020-04-15$16.19$16.19270,600——
2020-04-14$16.42$16.42221,300——
2020-04-13$16.33$16.33210,100——
2020-04-09$16.47$16.47251,400——
2020-04-08$15.88$15.88217,600——
2020-04-07$14.91$14.91260,500——
2020-04-06$15.61$15.61278,900——
2020-04-03$14.78$14.78220,600——
2020-04-02$14.77$14.77202,200——
2020-04-01$14.25$14.25234,800——
2020-03-31$14.84$14.84222,200——
2020-03-30$15.12$15.12278,400——
2020-03-27$14.06$14.06280,800——
2020-03-26$14.38$14.38319,400——
2020-03-25$13.10$13.10296,100——
2020-03-24$13.68$13.68272,800——
2020-03-23$13.19$13.19254,700——
2020-03-20$12.66$12.66370,700——
2020-03-19$13.35$13.35379,700——
2020-03-18$12.78$12.78295,600——
2020-03-17$14.50$14.50459,000——
2020-03-16$13.03$13.03388,300——
2020-03-13$14.19$14.19679,600——
2020-03-12$13.87$13.87291,500——
2020-03-11$15.30$15.30264,100——
2020-03-10$15.39$15.39307,900——
2020-03-09$14.56$14.56303,000——
2020-03-06$15.33$15.33408,500——
2020-03-05$15.71$15.71313,700——
2020-03-04$16.35$16.35254,700——
2020-03-03$15.73$15.73674,400——
2020-03-02$15.85$15.85321,200——
2020-02-28$15.39$15.39493,000——
2020-02-27$16.96$16.96319,800——
2020-02-26$17.28$17.28152,000——
2020-02-25$17.32$17.32166,000——
2020-02-24$17.58$17.58271,100——
2020-02-21$18.28$18.28174,500——
2020-02-20$18.47$18.47223,200——
2020-02-19$19.02$19.02157,900——
2020-02-18$18.81$18.81281,100——
2020-02-14$19.17$19.17145,200——
2020-02-13$19.29$19.29171,400——
2020-02-12$19.99$19.99177,200——
2020-02-11$19.97$19.97116,500——
2020-02-10$19.86$19.86109,300——
2020-02-07$19.92$19.92131,000——
2020-02-06$19.95$19.95170,600——
2020-02-05$19.60$19.60135,900——
2020-02-04$19.26$19.26170,800——
2020-02-03$19.12$19.12182,100——
2020-01-31$18.91$18.91248,400——
2020-01-30$19.34$19.34203,400——
2020-01-29$19.96$19.96198,800——
2020-01-28$19.72$19.72171,400——
2020-01-27$19.68$19.68160,300——
2020-01-24$19.64$19.64275,600——
2020-01-23$20.07$20.07327,900——
2020-01-22$20.00$20.00117,400——
2020-01-21$19.99$19.99158,100——
2020-01-17$20.08$20.08225,900——
2020-01-16$20.08$20.08164,900——
2020-01-15$20.03$20.03280,000——
2020-01-14$19.07$19.07305,500——
2020-01-13$18.79$18.79170,500——
2020-01-10$18.66$18.66152,200——
2020-01-09$18.71$18.71175,400——
2020-01-08$18.61$18.61236,000——
2020-01-07$18.42$18.42127,700——
2020-01-06$18.54$18.54181,700——
2020-01-03$18.89$18.89212,500——
2020-01-02$19.35$19.35143,700——