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 — 2015

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2015-12-31$14.23$14.23235,100
2015-12-30$14.33$14.33319,400
2015-12-29$14.30$14.30211,300
2015-12-28$14.17$14.17114,800
2015-12-24$14.29$14.2991,800
2015-12-23$14.46$14.4696,100
2015-12-22$14.41$14.41160,200
2015-12-21$14.32$14.32172,800
2015-12-18$14.20$14.20806,800
2015-12-17$14.19$14.19214,400
2015-12-16$14.32$14.32217,100
2015-12-15$14.30$14.30219,500
2015-12-14$14.31$14.31249,800
2015-12-11$14.07$14.07239,300
2015-12-10$14.31$14.31253,800
2015-12-09$14.28$14.28291,100
2015-12-08$14.47$14.47255,400
2015-12-07$14.53$14.53168,900
2015-12-04$14.92$14.92332,100
2015-12-03$15.17$15.17213,500
2015-12-02$15.36$15.36229,900
2015-12-01$15.49$15.49196,500
2015-11-30$15.35$15.35336,000
2015-11-27$15.47$15.47239,600
2015-11-25$14.85$14.85296,300
2015-11-24$14.30$14.30232,200
2015-11-23$14.29$14.29305,000
2015-11-20$14.30$14.30252,800
2015-11-19$14.39$14.39120,100
2015-11-18$14.75$14.75232,400
2015-11-17$14.18$14.18215,200
2015-11-16$13.80$13.80241,600
2015-11-13$13.90$13.90507,100
2015-11-12$12.26$12.26177,900
2015-11-11$12.56$12.56162,900
2015-11-10$12.85$12.85232,100
2015-11-09$12.67$12.67131,100
2015-11-06$12.92$12.92143,600
2015-11-05$12.56$12.56136,000
2015-11-04$12.90$12.90231,000
2015-11-03$12.37$12.37121,700
2015-11-02$12.53$12.53216,900
2015-10-30$11.84$11.84284,700
2015-10-29$11.75$11.75175,700
2015-10-28$12.14$12.14204,000
2015-10-27$11.31$11.31260,700
2015-10-26$11.34$11.34139,700
2015-10-23$11.61$11.61153,200
2015-10-22$11.02$11.02230,200
2015-10-21$11.35$11.35133,900
2015-10-20$11.60$11.60169,600
2015-10-19$12.22$12.22287,200
2015-10-16$11.90$11.90215,100
2015-10-15$11.61$11.61168,400
2015-10-14$11.12$11.12215,000
2015-10-13$11.02$11.02163,900
2015-10-12$11.46$11.46169,900
2015-10-09$11.39$11.39198,600
2015-10-08$11.45$11.45184,100
2015-10-07$11.52$11.52276,700
2015-10-06$11.27$11.27207,200
2015-10-05$11.59$11.59230,500
2015-10-02$11.69$11.69215,200
2015-10-01$11.53$11.53310,700
2015-09-30$11.69$11.69459,700
2015-09-29$10.78$10.78262,300
2015-09-28$10.97$10.97343,100
2015-09-25$11.40$11.40284,400
2015-09-24$12.42$12.42447,500
2015-09-23$12.85$12.85199,900
2015-09-22$13.21$13.21197,700
2015-09-21$13.86$13.86241,000
2015-09-18$14.73$14.731,158,000
2015-09-17$14.41$14.41267,800
2015-09-16$14.11$14.11188,400
2015-09-15$14.44$14.44207,400
2015-09-14$14.40$14.40288,800
2015-09-11$14.53$14.53294,100
2015-09-10$13.77$13.77178,900
2015-09-09$13.79$13.79278,500
2015-09-08$14.36$14.36266,200
2015-09-04$13.33$13.33170,700
2015-09-03$13.22$13.22267,000
2015-09-02$13.59$13.59144,000
2015-09-01$13.28$13.28286,700
2015-08-31$12.87$12.87140,600
2015-08-28$13.39$13.39161,900
2015-08-27$13.81$13.81221,900
2015-08-26$13.53$13.53348,400
2015-08-25$12.64$12.64250,800
2015-08-24$13.02$13.02234,100
2015-08-21$13.79$13.79204,500
2015-08-20$13.88$13.88234,800
2015-08-19$14.11$14.11203,800
2015-08-18$14.61$14.61234,400
2015-08-17$14.81$14.81217,800
2015-08-14$14.64$14.64262,000
2015-08-13$14.92$14.92286,300
2015-08-12$15.22$15.22125,200
2015-08-11$15.32$15.32213,500
2015-08-10$15.48$15.48318,000
2015-08-07$15.07$15.07304,200
2015-08-06$15.40$15.40140,800
2015-08-05$16.17$16.17129,200
2015-08-04$16.09$16.09111,700
2015-08-03$16.23$16.23170,400
2015-07-31$16.26$16.26209,500
2015-07-30$15.75$15.75242,400
2015-07-29$15.83$15.83217,800
2015-07-28$16.51$16.51175,200
2015-07-27$16.81$16.81228,700
2015-07-24$16.55$16.55203,400
2015-07-23$17.00$17.00115,300
2015-07-22$17.18$17.18165,200
2015-07-21$17.13$17.13215,800
2015-07-20$17.26$17.26218,500
2015-07-17$17.38$17.38219,800
2015-07-16$17.54$17.54240,100
2015-07-15$17.76$17.76369,200
2015-07-14$17.58$17.58265,900
2015-07-13$17.93$17.93394,200
2015-07-10$17.61$17.61423,700
2015-07-09$17.33$17.33199,800
2015-07-08$17.05$17.05196,900
2015-07-07$17.28$17.28249,000
2015-07-06$17.34$17.34364,000
2015-07-02$17.24$17.24152,000
2015-07-01$17.50$17.50244,200
2015-06-30$17.58$17.58235,100
2015-06-29$17.33$17.33426,200
2015-06-26$17.90$17.903,279,300
2015-06-25$18.19$18.19324,100
2015-06-24$18.00$18.00481,100
2015-06-23$17.96$17.96377,100
2015-06-22$17.70$17.70517,000
2015-06-19$17.28$17.28539,000
2015-06-18$17.00$17.00762,800
2015-06-17$16.40$16.40210,600
2015-06-16$16.37$16.37234,800
2015-06-15$16.19$16.19440,400
2015-06-12$16.14$16.14402,300
2015-06-11$16.60$16.60171,000
2015-06-10$16.43$16.43230,300
2015-06-09$16.24$16.24295,000
2015-06-08$16.56$16.56404,000
2015-06-05$16.45$16.45372,000
2015-06-04$16.47$16.47286,000
2015-06-03$16.48$16.48593,800
2015-06-02$15.79$15.79525,800
2015-06-01$15.53$15.53585,500
2015-05-29$15.34$15.34676,300
2015-05-28$15.13$15.13232,400
2015-05-27$15.11$15.11245,200
2015-05-26$14.79$14.79180,200
2015-05-22$14.80$14.8086,900
2015-05-21$14.67$14.6792,500
2015-05-20$14.79$14.79114,700
2015-05-19$14.89$14.89161,700
2015-05-18$15.14$15.14316,200
2015-05-15$15.27$15.27308,200
2015-05-14$15.41$15.41228,600
2015-05-13$15.21$15.21291,700
2015-05-12$14.40$14.4079,200
2015-05-11$14.62$14.62638,400
2015-05-08$13.90$13.90149,700
2015-05-07$13.80$13.8071,300
2015-05-06$13.80$13.80146,600
2015-05-05$14.12$14.12134,800
2015-05-04$14.61$14.61126,500
2015-05-01$14.60$14.60141,400
2015-04-30$14.46$14.46240,100
2015-04-29$15.05$15.05179,100
2015-04-28$14.96$14.96130,200
2015-04-27$15.03$15.03157,400
2015-04-24$15.25$15.25162,300
2015-04-23$15.29$15.2963,500
2015-04-22$15.08$15.08258,200
2015-04-21$15.21$15.2194,000
2015-04-20$15.10$15.10126,100
2015-04-17$15.11$15.11104,800
2015-04-16$15.31$15.31152,900
2015-04-15$15.28$15.2873,400
2015-04-14$15.22$15.2250,200
2015-04-13$15.24$15.2469,800
2015-04-10$15.34$15.34168,000
2015-04-09$14.99$14.99592,900
2015-04-08$15.09$15.09142,300
2015-04-07$14.85$14.85113,100
2015-04-06$15.05$15.05110,100
2015-04-02$14.95$14.9578,200
2015-04-01$15.02$15.02212,200
2015-03-31$14.96$14.96109,300
2015-03-30$14.96$14.96149,400
2015-03-27$15.43$15.43205,100
2015-03-26$14.95$14.95294,900
2015-03-25$14.42$14.42620,100
2015-03-24$15.33$15.33579,900
2015-03-23$15.36$15.36231,600
2015-03-20$14.74$14.74707,100
2015-03-19$14.44$14.44355,200
2015-03-18$14.82$14.82307,200
2015-03-17$15.15$15.15216,400
2015-03-16$15.27$15.27165,800
2015-03-13$15.51$15.51334,800
2015-03-12$15.46$15.46259,100
2015-03-11$14.86$14.86227,400
2015-03-10$14.99$14.99366,400
2015-03-09$14.97$14.97225,700
2015-03-06$14.78$14.78122,500
2015-03-05$14.50$14.50144,700
2015-03-04$14.49$14.49298,700
2015-03-03$14.02$14.0297,200
2015-03-02$14.04$14.04157,500
2015-02-27$14.00$14.00240,100
2015-02-26$13.85$13.8593,800
2015-02-25$13.64$13.6479,200
2015-02-24$13.60$13.60125,200
2015-02-23$13.55$13.55461,600
2015-02-20$12.85$12.8587,700
2015-02-19$12.86$12.86128,000
2015-02-18$12.74$12.7470,500
2015-02-17$12.83$12.83113,600
2015-02-13$12.76$12.7683,500
2015-02-12$12.74$12.7497,100
2015-02-11$12.90$12.9077,000
2015-02-10$12.98$12.98147,800
2015-02-09$13.03$13.03243,700
2015-02-06$12.75$12.75193,700
2015-02-05$12.90$12.90138,200
2015-02-04$12.80$12.80324,700
2015-02-03$12.37$12.37135,500
2015-02-02$12.49$12.49194,100
2015-01-30$12.13$12.13206,800
2015-01-29$12.51$12.5135,600
2015-01-28$12.21$12.2165,400
2015-01-27$12.47$12.47149,400
2015-01-26$12.24$12.24171,900
2015-01-23$11.77$11.77148,400
2015-01-22$11.73$11.73122,900
2015-01-21$11.70$11.70130,600
2015-01-20$11.90$11.9073,700
2015-01-16$11.92$11.92164,900
2015-01-15$11.31$11.31163,600
2015-01-14$11.99$11.9979,100
2015-01-13$11.85$11.85132,000
2015-01-12$12.00$12.00197,500
2015-01-09$11.98$11.98175,500
2015-01-08$12.25$12.25265,300
2015-01-07$12.78$12.78474,500
2015-01-06$11.81$11.81189,300
2015-01-05$11.83$11.83226,400
2015-01-02$11.84$11.84127,100