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 — 2023

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2023-12-29$61.85$61.85448,900——
2023-12-28$62.17$62.17342,700——
2023-12-27$62.93$62.93306,400——
2023-12-26$62.51$62.51647,700——
2023-12-22$60.92$60.92314,500——
2023-12-21$59.96$59.96203,200——
2023-12-20$58.53$58.53305,900——
2023-12-19$60.46$60.46377,200——
2023-12-18$58.06$58.06341,000——
2023-12-15$56.60$56.60926,200——
2023-12-14$58.16$58.16801,300——
2023-12-13$61.73$61.73877,300——
2023-12-12$58.64$58.64440,000——
2023-12-11$57.08$57.08285,500——
2023-12-08$56.77$56.77238,600——
2023-12-07$57.09$57.09311,400——
2023-12-06$58.25$58.25395,800——
2023-12-05$58.22$58.22485,900——
2023-12-04$59.92$59.92757,400——
2023-12-01$57.92$57.92457,000——
2023-11-30$56.32$56.32405,400——
2023-11-29$55.74$55.74396,300——
2023-11-28$54.41$54.41282,600——
2023-11-27$56.59$56.59654,100——
2023-11-24$56.87$56.8799,500——
2023-11-22$56.05$56.05282,000——
2023-11-21$56.65$56.65384,900——
2023-11-20$56.59$56.59371,200——
2023-11-17$55.85$55.85444,600——
2023-11-16$56.17$56.17368,500——
2023-11-15$57.52$57.52524,300——
2023-11-14$56.31$56.311,056,400——
2023-11-13$53.55$53.55518,500——
2023-11-10$52.56$52.56762,900——
2023-11-09$52.41$52.411,017,000——
2023-11-08$45.42$45.42421,700——
2023-11-07$46.01$46.01224,900——
2023-11-06$46.83$46.83254,000——
2023-11-03$46.59$46.59415,200——
2023-11-02$45.45$45.45278,800——
2023-11-01$45.44$45.44303,100——
2023-10-31$45.27$45.27260,600——
2023-10-30$45.18$45.18222,200——
2023-10-27$44.64$44.64316,300——
2023-10-26$44.94$44.94285,700——
2023-10-25$45.06$45.06322,000——
2023-10-24$45.35$45.35393,600——
2023-10-23$44.72$44.72263,600——
2023-10-20$44.49$44.49299,000——
2023-10-19$44.83$44.83249,700——
2023-10-18$47.20$47.20197,100——
2023-10-17$48.04$48.04381,000——
2023-10-16$46.47$46.47249,400——
2023-10-13$45.76$45.76647,400——
2023-10-12$46.16$46.16254,200——
2023-10-11$48.46$48.46196,500——
2023-10-10$47.96$47.96381,800——
2023-10-09$47.55$47.55243,700——
2023-10-06$47.19$47.19281,400——
2023-10-05$46.57$46.57336,700——
2023-10-04$45.89$45.89356,800——
2023-10-03$44.87$44.87414,600——
2023-10-02$45.74$45.74355,700——
2023-09-29$45.99$45.99524,100——
2023-09-28$47.30$47.30387,300——
2023-09-27$46.50$46.50377,300——
2023-09-26$45.51$45.51477,800——
2023-09-25$45.88$45.88158,900——
2023-09-22$45.51$45.51160,800——
2023-09-21$45.66$45.66514,600——
2023-09-20$46.20$46.20319,900——
2023-09-19$46.04$46.04193,800——
2023-09-18$46.23$46.23258,900——
2023-09-15$45.77$45.77855,200——
2023-09-14$47.07$47.07489,600——
2023-09-13$46.30$46.304,284,700——
2023-09-12$46.64$46.642,085,900——
2023-09-11$51.37$51.37289,700——
2023-09-08$50.01$50.01254,100——
2023-09-07$51.24$51.24250,300——
2023-09-06$52.03$52.03278,200——
2023-09-05$51.51$51.51474,400——
2023-09-01$54.53$54.53214,700——
2023-08-31$53.31$53.31227,700——
2023-08-30$54.36$54.36219,100——
2023-08-29$53.63$53.63246,000——
2023-08-28$52.95$52.95208,000——
2023-08-25$53.00$53.00222,700——
2023-08-24$53.54$53.54236,400——
2023-08-23$54.51$54.51282,800——
2023-08-22$53.49$53.49282,300——
2023-08-21$53.48$53.48207,700——
2023-08-18$52.87$52.87438,700——
2023-08-17$53.01$53.01432,200——
2023-08-16$56.05$56.05413,500——
2023-08-15$57.25$57.25383,300——
2023-08-14$54.07$54.07372,600——
2023-08-11$54.69$54.69499,000——
2023-08-10$53.40$53.401,184,500——
2023-08-09$62.21$62.21902,800——
2023-08-08$65.00$65.00437,900——
2023-08-07$63.08$63.08315,600——
2023-08-04$62.81$62.81202,700——
2023-08-03$63.08$63.08221,400——
2023-08-02$61.69$61.69258,200——
2023-08-01$60.64$60.64252,700——
2023-07-31$60.69$60.69240,500——
2023-07-28$60.83$60.83265,100——
2023-07-27$60.61$60.61293,800——
2023-07-26$61.38$61.38176,400——
2023-07-25$61.65$61.65329,400——
2023-07-24$60.68$60.68298,600——
2023-07-21$61.62$61.62588,800——
2023-07-20$63.25$63.25425,000——
2023-07-19$62.33$62.33611,600——
2023-07-18$61.07$61.07838,600——
2023-07-17$56.69$56.69274,500——
2023-07-14$55.87$55.87299,000——
2023-07-13$55.28$55.28452,400——
2023-07-12$54.89$54.89320,700——
2023-07-11$55.07$55.07492,500——
2023-07-10$56.94$56.94255,300——
2023-07-07$55.92$55.92401,300——
2023-07-06$57.18$57.18398,400——
2023-07-05$57.70$57.70350,300——
2023-07-03$57.63$57.63332,100——
2023-06-30$57.47$57.47431,300——
2023-06-29$55.91$55.91289,800——
2023-06-28$55.62$55.62418,900——
2023-06-27$56.14$56.14292,400——
2023-06-26$55.30$55.30653,200——
2023-06-23$57.16$57.16619,000——
2023-06-22$58.38$58.38574,700——
2023-06-21$56.36$56.36463,700——
2023-06-20$55.79$55.79918,100——
2023-06-16$55.03$55.031,249,700——
2023-06-15$52.23$52.231,056,100——
2023-06-14$47.94$47.94472,400——
2023-06-13$47.10$47.10401,100——
2023-06-12$47.23$47.23452,700——
2023-06-09$45.67$45.67310,300——
2023-06-08$45.89$45.89385,300——
2023-06-07$45.91$45.91453,600——
2023-06-06$45.88$45.88487,300——
2023-06-05$46.01$46.01357,200——
2023-06-02$46.70$46.70605,100——
2023-06-01$45.14$45.14481,100——
2023-05-31$44.37$44.37435,400——
2023-05-30$44.34$44.34282,700——
2023-05-26$44.14$44.14154,400——
2023-05-25$44.05$44.05235,400——
2023-05-24$44.09$44.09315,400——
2023-05-23$43.71$43.71403,600——
2023-05-22$44.27$44.27298,100——
2023-05-19$44.16$44.16347,000——
2023-05-18$43.84$43.84703,000——
2023-05-17$42.97$42.97544,600——
2023-05-16$42.94$42.94443,900——
2023-05-15$41.76$41.76642,200——
2023-05-12$41.62$41.62464,500——
2023-05-11$41.68$41.68411,300——
2023-05-10$41.19$41.19638,000——
2023-05-09$36.44$36.44422,700——
2023-05-08$36.42$36.42320,500——
2023-05-05$36.49$36.49327,900——
2023-05-04$36.56$36.56290,600——
2023-05-03$36.25$36.25279,700——
2023-05-02$36.95$36.95313,200——
2023-05-01$37.28$37.28434,400——
2023-04-28$35.77$35.77471,800——
2023-04-27$36.38$36.38461,100——
2023-04-26$38.16$38.16436,300——
2023-04-25$39.28$39.28558,900——
2023-04-24$40.91$40.911,116,300——
2023-04-21$43.84$43.84241,800——
2023-04-20$43.04$43.04344,200——
2023-04-19$43.22$43.22241,000——
2023-04-18$42.71$42.71239,700——
2023-04-17$41.96$41.96237,000——
2023-04-14$42.15$42.15424,600——
2023-04-13$41.87$41.87622,800——
2023-04-12$39.37$39.37322,300——
2023-04-11$40.05$40.05384,200——
2023-04-10$40.19$40.19433,000——
2023-04-06$39.47$39.47258,200——
2023-04-05$38.94$38.94344,400——
2023-04-04$38.74$38.74528,900——
2023-04-03$38.13$38.13364,600——
2023-03-31$37.50$37.50322,700——
2023-03-30$37.67$37.67129,400——
2023-03-29$37.55$37.55219,600——
2023-03-28$37.92$37.92222,400——
2023-03-27$37.89$37.89425,100——
2023-03-24$37.57$37.57205,700——
2023-03-23$36.91$36.91218,800——
2023-03-22$36.93$36.93383,600——
2023-03-21$36.98$36.98315,000——
2023-03-20$37.19$37.19336,400——
2023-03-17$36.29$36.291,221,600——
2023-03-16$37.60$37.60357,200——
2023-03-15$36.84$36.84356,000——
2023-03-14$37.20$37.20410,200——
2023-03-13$35.71$35.71297,800——
2023-03-10$35.73$35.73291,600——
2023-03-09$35.36$35.36238,500——
2023-03-08$35.43$35.43875,400——
2023-03-07$35.30$35.30239,200——
2023-03-06$35.13$35.13307,000——
2023-03-03$36.11$36.11241,100——
2023-03-02$37.00$37.00349,600——
2023-03-01$36.56$36.56790,800——
2023-02-28$31.86$31.86366,100——
2023-02-27$32.46$32.46355,900——
2023-02-24$32.54$32.54303,500——
2023-02-23$32.33$32.33167,800——
2023-02-22$32.06$32.06229,500——
2023-02-21$31.86$31.86193,900——
2023-02-17$32.39$32.39126,100——
2023-02-16$31.98$31.98191,800——
2023-02-15$32.56$32.56208,700——
2023-02-14$32.37$32.37217,200——
2023-02-13$32.44$32.44229,600——
2023-02-10$31.77$31.77187,800——
2023-02-09$31.17$31.17171,600——
2023-02-08$30.61$30.61185,700——
2023-02-07$30.89$30.89144,900——
2023-02-06$31.30$31.30203,600——
2023-02-03$31.21$31.21211,600——
2023-02-02$31.17$31.17167,100——
2023-02-01$30.61$30.61243,100——
2023-01-31$30.26$30.26271,800——
2023-01-30$30.29$30.29121,300——
2023-01-27$30.57$30.57167,000——
2023-01-26$31.12$31.12124,200——
2023-01-25$30.91$30.91131,800——
2023-01-24$30.75$30.75219,300——
2023-01-23$30.38$30.38391,300——
2023-01-20$28.97$28.97196,000——
2023-01-19$28.89$28.89152,800——
2023-01-18$28.70$28.70126,000——
2023-01-17$28.95$28.95187,200——
2023-01-13$28.96$28.96214,000——
2023-01-12$28.31$28.31223,400——
2023-01-11$28.21$28.21142,700——
2023-01-10$28.10$28.10177,600——
2023-01-09$28.04$28.04256,400——
2023-01-06$28.85$28.85217,800——
2023-01-05$28.12$28.12182,000——
2023-01-04$27.99$27.99226,700——
2023-01-03$28.20$28.20255,400——