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 — 2022

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2022-12-30$28.02$28.02179,400
2022-12-29$28.31$28.31204,700
2022-12-28$28.13$28.13141,200
2022-12-27$28.38$28.38106,100
2022-12-23$28.67$28.6799,500
2022-12-22$28.55$28.55124,300
2022-12-21$28.91$28.91125,600
2022-12-20$28.43$28.43150,800
2022-12-19$28.24$28.24236,900
2022-12-16$28.68$28.681,239,100
2022-12-15$28.78$28.78194,600
2022-12-14$29.16$29.16204,200
2022-12-13$28.78$28.78251,100
2022-12-12$28.63$28.63193,100
2022-12-09$28.38$28.38165,600
2022-12-08$29.20$29.20174,700
2022-12-07$29.50$29.50199,500
2022-12-06$28.82$28.82217,900
2022-12-05$29.36$29.36227,600
2022-12-02$30.21$30.21122,000
2022-12-01$30.02$30.02206,300
2022-11-30$29.49$29.49275,000
2022-11-29$29.39$29.39239,000
2022-11-28$29.25$29.25223,300
2022-11-25$29.18$29.1886,800
2022-11-23$28.69$28.69120,100
2022-11-22$28.78$28.78190,200
2022-11-21$28.40$28.40208,800
2022-11-18$28.40$28.40159,800
2022-11-17$28.33$28.33173,000
2022-11-16$28.29$28.29140,200
2022-11-15$28.37$28.37207,800
2022-11-14$28.36$28.36188,300
2022-11-11$28.31$28.31205,700
2022-11-10$28.48$28.48329,500
2022-11-09$28.26$28.26257,100
2022-11-08$27.28$27.28489,300
2022-11-07$30.10$30.10166,100
2022-11-04$29.76$29.76160,800
2022-11-03$29.77$29.77208,800
2022-11-02$30.35$30.35292,900
2022-11-01$31.27$31.27194,500
2022-10-31$30.90$30.90214,900
2022-10-28$30.98$30.98230,300
2022-10-27$30.35$30.35128,300
2022-10-26$30.59$30.59162,900
2022-10-25$29.64$29.64229,600
2022-10-24$30.88$30.88174,300
2022-10-21$30.66$30.66214,700
2022-10-20$29.10$29.10140,000
2022-10-19$29.23$29.23199,900
2022-10-18$29.88$29.88192,000
2022-10-17$29.32$29.32192,600
2022-10-14$28.53$28.53181,400
2022-10-13$28.66$28.66284,800
2022-10-12$27.67$27.67191,000
2022-10-11$28.09$28.09274,600
2022-10-10$28.02$28.02227,300
2022-10-07$29.04$29.04346,300
2022-10-06$28.86$28.86188,700
2022-10-05$28.35$28.35192,500
2022-10-04$28.54$28.54204,300
2022-10-03$28.40$28.40216,200
2022-09-30$28.10$28.10312,000
2022-09-29$28.99$28.99190,700
2022-09-28$29.33$29.33239,400
2022-09-27$28.37$28.37232,400
2022-09-26$28.24$28.24315,700
2022-09-23$27.56$27.56222,600
2022-09-22$27.59$27.59267,600
2022-09-21$27.97$27.97222,000
2022-09-20$28.26$28.26198,400
2022-09-19$28.45$28.45282,400
2022-09-16$29.23$29.23705,300
2022-09-15$29.33$29.33268,400
2022-09-14$29.62$29.62349,200
2022-09-13$28.93$28.93348,900
2022-09-12$29.03$29.03312,000
2022-09-09$28.17$28.17255,000
2022-09-08$28.18$28.18246,500
2022-09-07$28.47$28.47332,900
2022-09-06$28.36$28.36371,300
2022-09-02$28.91$28.91272,000
2022-09-01$29.70$29.70322,500
2022-08-31$29.60$29.60379,500
2022-08-30$30.04$30.04299,200
2022-08-29$30.42$30.42247,800
2022-08-26$31.01$31.01208,800
2022-08-25$31.58$31.58166,200
2022-08-24$31.78$31.78197,100
2022-08-23$32.41$32.41231,000
2022-08-22$33.02$33.02230,000
2022-08-19$33.76$33.76232,600
2022-08-18$32.44$32.44166,800
2022-08-17$32.04$32.04197,800
2022-08-16$32.52$32.52305,200
2022-08-15$32.53$32.53335,600
2022-08-12$31.62$31.62416,300
2022-08-11$31.32$31.32623,000
2022-08-10$32.06$32.06457,400
2022-08-09$32.06$32.061,346,700
2022-08-08$37.75$37.75453,400
2022-08-05$36.76$36.76336,400
2022-08-04$36.96$36.96247,300
2022-08-03$37.29$37.29414,300
2022-08-02$37.38$37.38209,100
2022-08-01$36.99$36.99215,200
2022-07-29$37.39$37.39269,600
2022-07-28$37.27$37.27201,600
2022-07-27$37.20$37.20240,400
2022-07-26$37.12$37.12204,200
2022-07-25$36.88$36.88232,600
2022-07-22$35.96$35.96170,500
2022-07-21$36.09$36.09223,700
2022-07-20$35.61$35.61319,500
2022-07-19$36.64$36.64259,900
2022-07-18$36.70$36.70414,100
2022-07-15$36.99$36.99491,700
2022-07-14$35.56$35.56220,400
2022-07-13$35.80$35.80229,200
2022-07-12$35.82$35.82331,900
2022-07-11$36.63$36.63313,200
2022-07-08$36.11$36.11275,400
2022-07-07$36.41$36.41370,000
2022-07-06$35.28$35.28415,400
2022-07-05$34.66$34.66437,300
2022-07-01$35.35$35.35408,500
2022-06-30$34.79$34.79748,900
2022-06-29$34.15$34.15331,800
2022-06-28$33.25$33.25291,500
2022-06-27$34.28$34.28375,700
2022-06-24$31.78$31.781,255,800
2022-06-23$32.74$32.74515,700
2022-06-22$31.71$31.71361,500
2022-06-21$31.61$31.61420,800
2022-06-17$31.52$31.521,116,500
2022-06-16$31.11$31.11459,500
2022-06-15$31.32$31.32663,600
2022-06-14$31.02$31.02588,100
2022-06-13$29.79$29.79829,000
2022-06-10$30.02$30.02992,500
2022-06-09$30.19$30.192,794,100
2022-06-08$38.29$38.291,207,100
2022-06-07$41.41$41.412,036,400
2022-06-06$37.47$37.47358,700
2022-06-03$37.77$37.77600,600
2022-06-02$38.27$38.27674,400
2022-06-01$37.66$37.66513,100
2022-05-31$37.14$37.14802,900
2022-05-27$38.87$38.87844,200
2022-05-26$36.18$36.18479,400
2022-05-25$36.72$36.72957,500
2022-05-24$33.94$33.94309,100
2022-05-23$34.80$34.80355,600
2022-05-20$33.70$33.70499,700
2022-05-19$33.70$33.70344,000
2022-05-18$34.07$34.07567,000
2022-05-17$35.93$35.93374,400
2022-05-16$35.37$35.37506,600
2022-05-13$35.34$35.34582,700
2022-05-12$34.80$34.80593,400
2022-05-11$32.98$32.98528,200
2022-05-10$34.00$34.00709,700
2022-05-09$31.76$31.76630,700
2022-05-06$32.71$32.71562,700
2022-05-05$34.10$34.10336,100
2022-05-04$35.02$35.02371,300
2022-05-03$35.09$35.09346,000
2022-05-02$35.31$35.31493,700
2022-04-29$35.47$35.47334,400
2022-04-28$35.43$35.43323,400
2022-04-27$36.05$36.05411,500
2022-04-26$36.14$36.14600,500
2022-04-25$36.88$36.88537,000
2022-04-22$37.38$37.38359,400
2022-04-21$38.44$38.44362,300
2022-04-20$39.11$39.11270,900
2022-04-19$39.04$39.04437,500
2022-04-18$38.43$38.43905,300
2022-04-14$41.54$41.54750,200
2022-04-13$42.29$42.29388,100
2022-04-12$42.10$42.10570,800
2022-04-11$41.25$41.25818,100
2022-04-08$41.16$41.16782,100
2022-04-07$40.17$40.17730,300
2022-04-06$37.79$37.79403,800
2022-04-05$36.82$36.82479,200
2022-04-04$37.89$37.89361,200
2022-04-01$37.41$37.41326,900
2022-03-31$35.90$35.90662,700
2022-03-30$36.43$36.43225,300
2022-03-29$35.83$35.83431,900
2022-03-28$36.45$36.45358,400
2022-03-25$36.44$36.44331,000
2022-03-24$35.77$35.77228,500
2022-03-23$35.48$35.48290,500
2022-03-22$35.54$35.54365,800
2022-03-21$35.45$35.45401,900
2022-03-18$34.22$34.22656,800
2022-03-17$34.18$34.18470,900
2022-03-16$34.22$34.22526,400
2022-03-15$34.74$34.74658,000
2022-03-14$34.81$34.81966,500
2022-03-11$34.30$34.301,230,400
2022-03-10$30.47$30.47401,700
2022-03-09$30.10$30.10348,600
2022-03-08$29.91$29.91405,600
2022-03-07$30.74$30.74548,000
2022-03-04$28.63$28.63274,300
2022-03-03$28.46$28.46284,800
2022-03-02$28.40$28.40216,700
2022-03-01$27.43$27.43890,400
2022-02-28$27.71$27.71435,300
2022-02-25$28.77$28.77652,500
2022-02-24$27.56$27.56467,300
2022-02-23$27.46$27.46506,800
2022-02-22$26.10$26.10230,900
2022-02-18$26.21$26.21821,000
2022-02-17$26.02$26.02300,700
2022-02-16$26.52$26.52217,600
2022-02-15$26.40$26.40220,100
2022-02-14$26.05$26.05436,900
2022-02-11$27.14$27.14217,000
2022-02-10$26.32$26.32236,500
2022-02-09$26.07$26.07267,600
2022-02-08$26.51$26.51469,200
2022-02-07$26.27$26.27909,100
2022-02-04$25.04$25.04256,400
2022-02-03$25.44$25.44273,100
2022-02-02$25.33$25.33378,000
2022-02-01$24.68$24.68402,500
2022-01-31$23.09$23.09950,100
2022-01-28$26.06$26.06641,500
2022-01-27$25.03$25.03139,700
2022-01-26$24.63$24.63219,900
2022-01-25$24.91$24.91148,000
2022-01-24$24.72$24.72166,300
2022-01-21$24.75$24.75180,000
2022-01-20$24.63$24.63155,400
2022-01-19$25.09$25.09206,300
2022-01-18$25.35$25.35236,400
2022-01-14$25.37$25.37159,000
2022-01-13$24.91$24.91228,200
2022-01-12$25.61$25.61389,200
2022-01-11$25.30$25.30288,400
2022-01-10$25.83$25.83486,500
2022-01-07$25.05$25.05428,900
2022-01-06$23.18$23.18143,800
2022-01-05$23.08$23.08128,900
2022-01-04$22.96$22.96144,600
2022-01-03$23.07$23.07236,500