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 — 2025

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2025-12-31$26.78$26.78218,300
2025-12-30$27.00$27.00251,500
2025-12-29$26.79$26.79220,500
2025-12-26$27.12$27.12229,000
2025-12-24$26.81$26.81175,200
2025-12-23$26.45$26.45333,300
2025-12-22$27.32$27.32507,300
2025-12-19$26.60$26.60812,100
2025-12-18$26.50$26.50340,800
2025-12-17$26.07$26.07389,800
2025-12-16$25.61$25.61499,500
2025-12-15$26.31$26.31472,900
2025-12-12$25.27$25.27341,400
2025-12-11$25.90$25.90284,900
2025-12-10$25.71$25.71483,500
2025-12-09$25.65$25.65414,100
2025-12-08$26.01$26.01300,900
2025-12-05$26.77$26.77323,300
2025-12-04$27.15$27.15404,800
2025-12-03$27.58$27.58317,300
2025-12-02$26.67$26.67456,400
2025-12-01$27.45$27.45355,900
2025-11-28$27.70$27.70208,300
2025-11-26$27.36$27.36410,900
2025-11-25$27.69$27.69375,500
2025-11-24$26.71$26.71349,500
2025-11-21$26.01$26.01392,900
2025-11-20$25.36$25.36355,800
2025-11-19$25.37$25.37524,400
2025-11-18$25.90$25.90484,900
2025-11-17$26.02$26.02417,700
2025-11-14$26.06$26.06294,100
2025-11-13$26.37$26.37488,800
2025-11-12$27.83$27.83685,800
2025-11-11$27.16$27.16541,200
2025-11-10$26.12$26.12826,300
2025-11-07$24.03$24.03809,400
2025-11-06$24.23$24.23767,200
2025-11-05$25.31$25.31335,200
2025-11-04$25.26$25.26416,500
2025-11-03$25.30$25.30361,700
2025-10-31$25.50$25.50552,300
2025-10-30$24.66$24.66390,800
2025-10-29$24.24$24.24363,100
2025-10-28$24.18$24.18264,300
2025-10-27$24.04$24.04319,200
2025-10-24$24.52$24.52220,800
2025-10-23$24.72$24.72309,400
2025-10-22$24.52$24.52582,800
2025-10-21$24.26$24.26335,200
2025-10-20$23.73$23.73255,500
2025-10-17$23.78$23.78321,500
2025-10-16$23.22$23.22449,600
2025-10-15$23.14$23.14504,300
2025-10-14$23.86$23.86282,200
2025-10-13$23.51$23.51324,100
2025-10-10$23.63$23.63607,400
2025-10-09$24.97$24.97441,600
2025-10-08$25.98$25.98250,000
2025-10-07$25.83$25.83390,500
2025-10-06$26.58$26.58241,800
2025-10-03$26.75$26.75331,100
2025-10-02$26.52$26.52288,400
2025-10-01$26.99$26.99337,100
2025-09-30$26.65$26.65392,200
2025-09-29$26.92$26.92513,400
2025-09-26$26.85$26.85291,300
2025-09-25$26.36$26.36566,000
2025-09-24$26.87$26.87302,700
2025-09-23$27.41$27.41323,900
2025-09-22$27.89$27.89424,700
2025-09-19$27.64$27.641,384,000
2025-09-18$27.44$27.44458,900
2025-09-17$26.98$26.98920,900
2025-09-16$27.00$27.00497,900
2025-09-15$27.27$27.27422,800
2025-09-12$28.06$28.06273,500
2025-09-11$28.68$28.68422,300
2025-09-10$28.40$28.40309,800
2025-09-09$29.33$29.33379,400
2025-09-08$29.26$29.26385,700
2025-09-05$29.42$29.42414,900
2025-09-04$29.19$29.19553,500
2025-09-03$29.39$29.39567,000
2025-09-02$30.81$30.81414,800
2025-08-29$30.62$30.62290,900
2025-08-28$30.26$30.26316,700
2025-08-27$30.49$30.49326,000
2025-08-26$30.34$30.34408,400
2025-08-25$29.83$29.83374,400
2025-08-22$30.50$30.50494,900
2025-08-21$29.66$29.66491,400
2025-08-20$29.62$29.62434,200
2025-08-19$30.33$30.33527,800
2025-08-18$29.76$29.76433,100
2025-08-15$29.83$29.83652,000
2025-08-14$30.21$30.21464,400
2025-08-13$30.48$30.481,016,600
2025-08-12$30.35$30.351,601,700
2025-08-11$27.36$27.361,816,500
2025-08-08$23.81$23.811,004,800
2025-08-07$21.62$21.62705,600
2025-08-06$20.82$20.82414,600
2025-08-05$21.44$21.44389,000
2025-08-04$21.40$21.40463,700
2025-08-01$21.21$21.21440,200
2025-07-31$20.95$20.95545,000
2025-07-30$21.34$21.34304,700
2025-07-29$21.67$21.67359,000
2025-07-28$22.24$22.24457,600
2025-07-25$22.37$22.37329,100
2025-07-24$22.51$22.51320,100
2025-07-23$22.63$22.63518,100
2025-07-22$21.35$21.35469,800
2025-07-21$21.19$21.19536,100
2025-07-18$20.62$20.62430,200
2025-07-17$21.70$21.70407,700
2025-07-16$21.27$21.27675,600
2025-07-15$21.18$21.18504,300
2025-07-14$21.95$21.95504,900
2025-07-11$21.66$21.66449,100
2025-07-10$22.21$22.21464,400
2025-07-09$22.44$22.44371,500
2025-07-08$22.60$22.60657,400
2025-07-07$22.86$22.86791,100
2025-07-03$23.20$23.20221,800
2025-07-02$23.58$23.58465,400
2025-07-01$23.34$23.34444,400
2025-06-30$22.96$22.96396,100
2025-06-27$23.08$23.081,270,600
2025-06-26$23.18$23.18517,500
2025-06-25$23.45$23.45426,900
2025-06-24$24.58$24.58395,500
2025-06-23$24.68$24.68409,000
2025-06-20$24.56$24.56672,700
2025-06-18$25.34$25.34394,000
2025-06-17$25.61$25.61400,000
2025-06-16$25.98$25.98365,900
2025-06-13$25.82$25.82402,400
2025-06-12$26.44$26.44507,000
2025-06-11$26.05$26.05528,200
2025-06-10$26.92$26.92624,900
2025-06-09$26.62$26.62514,500
2025-06-06$25.99$25.99359,200
2025-06-05$25.52$25.52555,200
2025-06-04$25.86$25.86395,500
2025-06-03$26.01$26.01526,300
2025-06-02$25.38$25.38656,400
2025-05-30$25.71$25.71460,900
2025-05-29$25.64$25.64524,700
2025-05-28$25.26$25.26476,300
2025-05-27$25.53$25.53532,500
2025-05-23$24.47$24.47548,600
2025-05-22$24.20$24.20360,900
2025-05-21$24.16$24.16341,400
2025-05-20$25.07$25.07482,100
2025-05-19$24.79$24.79359,000
2025-05-16$24.86$24.86510,300
2025-05-15$24.32$24.32667,700
2025-05-14$23.30$23.30578,000
2025-05-13$23.88$23.88445,000
2025-05-12$24.34$24.34563,800
2025-05-09$24.11$24.11790,200
2025-05-08$24.65$24.65751,600
2025-05-07$24.43$24.43819,800
2025-05-06$23.87$23.87751,900
2025-05-05$25.12$25.12681,300
2025-05-02$24.50$24.50674,100
2025-05-01$23.88$23.88562,400
2025-04-30$24.41$24.41460,200
2025-04-29$24.50$24.50296,400
2025-04-28$24.41$24.41355,500
2025-04-25$24.19$24.19235,300
2025-04-24$24.07$24.07388,200
2025-04-23$23.56$23.56317,400
2025-04-22$23.93$23.93524,700
2025-04-21$23.50$23.50486,500
2025-04-17$23.35$23.35735,000
2025-04-16$22.99$22.99904,500
2025-04-15$23.50$23.50779,900
2025-04-14$24.42$24.42523,500
2025-04-11$24.16$24.16482,800
2025-04-10$23.52$23.52840,600
2025-04-09$25.23$25.231,011,400
2025-04-08$23.75$23.75972,700
2025-04-07$25.00$25.001,290,500
2025-04-04$26.61$26.61699,400
2025-04-03$27.24$27.24605,700
2025-04-02$27.80$27.80717,800
2025-04-01$28.29$28.29785,100
2025-03-31$28.99$28.99547,900
2025-03-28$28.43$28.43386,800
2025-03-27$28.50$28.50457,500
2025-03-26$28.37$28.37437,900
2025-03-25$28.39$28.39713,200
2025-03-24$28.46$28.46538,400
2025-03-21$28.29$28.291,478,700
2025-03-20$27.91$27.91407,000
2025-03-19$27.86$27.86471,500
2025-03-18$27.36$27.36602,500
2025-03-17$27.69$27.69648,300
2025-03-14$26.66$26.66500,700
2025-03-13$26.24$26.24467,600
2025-03-12$26.28$26.28700,400
2025-03-11$27.33$27.33515,800
2025-03-10$28.41$28.41537,000
2025-03-07$28.81$28.81544,300
2025-03-06$28.32$28.32721,300
2025-03-05$28.06$28.06632,400
2025-03-04$27.62$27.62803,200
2025-03-03$27.52$27.52999,400
2025-02-28$28.43$28.431,792,700
2025-02-27$31.49$31.49606,600
2025-02-26$31.21$31.21508,000
2025-02-25$31.99$31.99575,600
2025-02-24$32.29$32.29518,400
2025-02-21$31.28$31.28523,500
2025-02-20$31.30$31.30550,100
2025-02-19$31.21$31.21661,900
2025-02-18$30.75$30.75977,600
2025-02-14$31.02$31.02550,000
2025-02-13$31.74$31.74316,800
2025-02-12$31.82$31.82358,800
2025-02-11$32.21$32.21435,600
2025-02-10$32.21$32.21319,600
2025-02-07$32.37$32.37311,500
2025-02-06$32.79$32.79349,600
2025-02-05$32.79$32.79356,000
2025-02-04$33.19$33.19440,800
2025-02-03$33.39$33.39611,600
2025-01-31$34.87$34.87517,500
2025-01-30$36.37$36.37421,800
2025-01-29$36.42$36.42425,100
2025-01-28$37.12$37.12444,800
2025-01-27$37.11$37.11421,400
2025-01-24$36.50$36.50588,500
2025-01-23$36.39$36.39350,600
2025-01-22$36.14$36.14358,100
2025-01-21$36.03$36.03474,800
2025-01-17$35.70$35.70410,500
2025-01-16$35.66$35.661,060,400
2025-01-15$36.24$36.24908,100
2025-01-14$38.48$38.48605,700
2025-01-13$37.92$37.92461,900
2025-01-10$36.36$36.36410,100
2025-01-08$36.63$36.63923,600
2025-01-07$35.25$35.25801,500
2025-01-06$35.43$35.43828,600
2025-01-03$36.30$36.30633,300
2025-01-02$36.36$36.36410,200