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.

View year

Historical Stock Price — 2017

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2017-12-29$19.24$19.24250,800
2017-12-28$19.74$19.74147,900
2017-12-27$19.75$19.75233,700
2017-12-26$19.64$19.64159,300
2017-12-22$19.37$19.37153,200
2017-12-21$19.50$19.50191,800
2017-12-20$19.31$19.31214,700
2017-12-19$19.18$19.18184,600
2017-12-18$19.52$19.52208,900
2017-12-15$19.30$19.30663,500
2017-12-14$18.73$18.73164,100
2017-12-13$19.21$19.21161,700
2017-12-12$19.26$19.26262,300
2017-12-11$18.60$18.60158,100
2017-12-08$18.46$18.46107,900
2017-12-07$18.32$18.32172,700
2017-12-06$18.33$18.33131,200
2017-12-05$18.68$18.68154,800
2017-12-04$18.89$18.89150,000
2017-12-01$19.18$19.18257,200
2017-11-30$19.59$19.59738,400
2017-11-29$19.08$19.08663,600
2017-11-28$18.19$18.19490,100
2017-11-27$18.03$18.03262,100
2017-11-24$18.30$18.30194,700
2017-11-22$18.90$18.90206,400
2017-11-21$18.88$18.88219,600
2017-11-20$18.33$18.33139,000
2017-11-17$18.38$18.38115,100
2017-11-16$18.15$18.15142,000
2017-11-15$17.86$17.86197,000
2017-11-14$17.76$17.76225,100
2017-11-13$17.86$17.86229,300
2017-11-10$18.55$18.55305,400
2017-11-09$18.81$18.81388,100
2017-11-08$17.81$17.81268,600
2017-11-07$17.89$17.89175,800
2017-11-06$17.97$17.97293,100
2017-11-03$19.12$19.12323,500
2017-11-02$18.52$18.52150,200
2017-11-01$18.43$18.43178,600
2017-10-31$18.07$18.07205,600
2017-10-30$18.15$18.15142,200
2017-10-27$18.41$18.41126,400
2017-10-26$18.41$18.41212,300
2017-10-25$18.18$18.18197,000
2017-10-24$18.25$18.25162,200
2017-10-23$18.26$18.26176,500
2017-10-20$18.50$18.50109,600
2017-10-19$18.45$18.45117,900
2017-10-18$18.54$18.54133,100
2017-10-17$18.48$18.48157,400
2017-10-16$18.74$18.74235,800
2017-10-13$18.67$18.67134,500
2017-10-12$18.71$18.71139,300
2017-10-11$18.86$18.86148,900
2017-10-10$18.70$18.7090,600
2017-10-09$18.70$18.70112,200
2017-10-06$18.94$18.9486,000
2017-10-05$18.96$18.96284,900
2017-10-04$18.49$18.49190,100
2017-10-03$18.55$18.55259,600
2017-10-02$18.69$18.69332,800
2017-09-29$17.87$17.87242,600
2017-09-28$17.89$17.89139,400
2017-09-27$17.99$17.99235,000
2017-09-26$17.48$17.48395,300
2017-09-25$16.27$16.27204,100
2017-09-22$16.10$16.10173,900
2017-09-21$16.40$16.40403,200
2017-09-20$15.64$15.6493,300
2017-09-19$15.66$15.66149,400
2017-09-18$15.78$15.78106,200
2017-09-15$15.73$15.73303,400
2017-09-14$15.78$15.78107,500
2017-09-13$15.69$15.69115,000
2017-09-12$15.77$15.77146,800
2017-09-11$15.79$15.79152,700
2017-09-08$15.68$15.68143,300
2017-09-07$15.54$15.54119,200
2017-09-06$15.65$15.65140,900
2017-09-05$15.73$15.73185,300
2017-09-01$15.88$15.88159,800
2017-08-31$16.01$16.01166,400
2017-08-30$15.48$15.48113,500
2017-08-29$15.73$15.73248,400
2017-08-28$15.68$15.68166,600
2017-08-25$15.55$15.55169,600
2017-08-24$15.43$15.43118,300
2017-08-23$15.44$15.44135,000
2017-08-22$15.49$15.49318,900
2017-08-21$15.07$15.07169,400
2017-08-18$15.22$15.22271,600
2017-08-17$14.73$14.73160,400
2017-08-16$14.89$14.89119,400
2017-08-15$14.80$14.80148,700
2017-08-14$14.76$14.76171,400
2017-08-11$14.89$14.89247,000
2017-08-10$15.27$15.27368,700
2017-08-09$15.54$15.54254,000
2017-08-08$15.64$15.64206,800
2017-08-07$15.94$15.94171,500
2017-08-04$15.98$15.98157,900
2017-08-03$15.72$15.72368,100
2017-08-02$16.06$16.06237,800
2017-08-01$16.67$16.67419,200
2017-07-31$17.28$17.28131,700
2017-07-28$17.56$17.56118,700
2017-07-27$17.29$17.29210,200
2017-07-26$17.62$17.62128,900
2017-07-25$17.71$17.71152,700
2017-07-24$17.75$17.75174,800
2017-07-21$18.45$18.45576,500
2017-07-20$17.92$17.92131,500
2017-07-19$17.74$17.74179,600
2017-07-18$17.87$17.8796,600
2017-07-17$17.95$17.95160,300
2017-07-14$17.82$17.82144,300
2017-07-13$17.84$17.84130,700
2017-07-12$17.85$17.85208,800
2017-07-11$17.86$17.86152,700
2017-07-10$17.62$17.62175,900
2017-07-07$18.10$18.10212,500
2017-07-06$17.91$17.91190,600
2017-07-05$17.95$17.95175,000
2017-07-03$17.93$17.93136,900
2017-06-30$17.86$17.86255,900
2017-06-29$17.60$17.60241,600
2017-06-28$17.68$17.68288,500
2017-06-27$17.26$17.26176,500
2017-06-26$17.74$17.74147,100
2017-06-23$17.79$17.79237,400
2017-06-22$17.65$17.65407,900
2017-06-21$17.48$17.48278,500
2017-06-20$17.14$17.14440,700
2017-06-19$16.93$16.93360,700
2017-06-16$16.62$16.62972,800
2017-06-15$16.18$16.18275,600
2017-06-14$16.22$16.22350,600
2017-06-13$16.49$16.49489,200
2017-06-12$16.60$16.60311,100
2017-06-09$16.84$16.84240,600
2017-06-08$17.11$17.11261,200
2017-06-07$16.95$16.95182,000
2017-06-06$16.92$16.92242,400
2017-06-05$17.06$17.06207,400
2017-06-02$17.14$17.14298,200
2017-06-01$17.09$17.09386,500
2017-05-31$17.07$17.071,842,000
2017-05-30$17.07$17.07701,000
2017-05-26$16.97$16.971,459,400
2017-05-25$15.47$15.47273,100
2017-05-24$15.50$15.50250,300
2017-05-23$15.56$15.56175,000
2017-05-22$15.54$15.54160,600
2017-05-19$15.45$15.45194,500
2017-05-18$15.55$15.55220,800
2017-05-17$15.33$15.33218,000
2017-05-16$15.79$15.79317,700
2017-05-15$15.80$15.80351,900
2017-05-12$16.22$16.22388,100
2017-05-11$15.87$15.87504,700
2017-05-10$15.11$15.11328,800
2017-05-09$14.73$14.73537,100
2017-05-08$14.94$14.94310,500
2017-05-05$15.00$15.00195,100
2017-05-04$15.14$15.14127,000
2017-05-03$14.92$14.92269,600
2017-05-02$15.35$15.35237,000
2017-05-01$15.21$15.21169,200
2017-04-28$15.10$15.10154,600
2017-04-27$15.16$15.16165,000
2017-04-26$15.32$15.32263,400
2017-04-25$15.00$15.00172,000
2017-04-24$14.87$14.87509,800
2017-04-21$14.74$14.74236,500
2017-04-20$14.65$14.65213,400
2017-04-19$14.51$14.51154,500
2017-04-18$14.54$14.54209,300
2017-04-17$14.88$14.88167,800
2017-04-13$14.80$14.80237,100
2017-04-12$14.76$14.76175,300
2017-04-11$14.66$14.66199,800
2017-04-10$14.56$14.56220,000
2017-04-07$14.62$14.62387,200
2017-04-06$14.37$14.37261,600
2017-04-05$14.20$14.20372,400
2017-04-04$14.30$14.30289,600
2017-04-03$14.17$14.17296,500
2017-03-31$14.50$14.50383,300
2017-03-30$14.73$14.73561,700
2017-03-29$14.69$14.69440,200
2017-03-28$14.63$14.63368,200
2017-03-27$14.27$14.27333,800
2017-03-24$13.76$13.76234,100
2017-03-23$13.71$13.71244,300
2017-03-22$13.60$13.60248,000
2017-03-21$13.51$13.51349,800
2017-03-20$14.27$14.27277,700
2017-03-17$13.75$13.75924,100
2017-03-16$13.35$13.35530,000
2017-03-15$13.43$13.431,008,000
2017-03-14$12.20$12.201,640,700
2017-03-13$14.74$14.74285,300
2017-03-10$14.62$14.62175,200
2017-03-09$14.64$14.64269,900
2017-03-08$14.83$14.83280,300
2017-03-07$14.97$14.97239,500
2017-03-06$14.87$14.87280,100
2017-03-03$15.03$15.03315,500
2017-03-02$15.14$15.14349,700
2017-03-01$15.53$15.53267,200
2017-02-28$15.47$15.47413,800
2017-02-27$15.72$15.72324,300
2017-02-24$15.19$15.19394,700
2017-02-23$14.81$14.81347,300
2017-02-22$14.12$14.12470,200
2017-02-21$14.20$14.201,612,800
2017-02-17$18.40$18.40452,200
2017-02-16$18.00$18.00414,800
2017-02-15$18.00$18.00314,100
2017-02-14$17.51$17.51243,600
2017-02-13$17.20$17.20312,800
2017-02-10$16.72$16.72235,100
2017-02-09$16.66$16.66281,300
2017-02-08$16.62$16.62384,800
2017-02-07$15.81$15.81348,000
2017-02-06$16.00$16.00229,900
2017-02-03$16.12$16.12239,700
2017-02-02$15.84$15.84239,400
2017-02-01$16.02$16.02431,900
2017-01-31$15.75$15.75229,900
2017-01-30$15.21$15.21206,000
2017-01-27$15.58$15.58291,600
2017-01-26$15.53$15.53246,000
2017-01-25$15.92$15.92203,500
2017-01-24$15.65$15.65296,800
2017-01-23$15.77$15.77294,000
2017-01-20$15.84$15.84390,000
2017-01-19$16.01$16.01416,700
2017-01-18$16.56$16.56438,900
2017-01-17$16.51$16.51856,700
2017-01-13$17.15$17.15359,400
2017-01-12$17.33$17.33488,500
2017-01-11$17.25$17.25537,200
2017-01-10$18.16$18.16378,100
2017-01-09$18.61$18.61209,500
2017-01-06$18.30$18.30283,800
2017-01-05$18.70$18.70386,600
2017-01-04$19.39$19.39525,600
2017-01-03$18.50$18.50515,900