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 — 2024

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2024-12-31$37.13$37.13568,400
2024-12-30$36.84$36.84484,400
2024-12-27$37.80$37.80374,200
2024-12-26$38.17$38.17403,600
2024-12-24$38.27$38.27305,200
2024-12-23$39.12$39.12543,000
2024-12-20$39.14$39.142,484,900
2024-12-19$39.39$39.39669,500
2024-12-18$39.45$39.45984,600
2024-12-17$40.85$40.85524,800
2024-12-16$40.84$40.84665,900
2024-12-13$42.24$42.24831,500
2024-12-12$44.50$44.50632,700
2024-12-11$43.57$43.57328,200
2024-12-10$43.64$43.64388,200
2024-12-09$43.83$43.83435,700
2024-12-06$43.80$43.80267,300
2024-12-05$43.60$43.60699,900
2024-12-04$44.30$44.30401,300
2024-12-03$44.92$44.92308,300
2024-12-02$45.88$45.88606,700
2024-11-29$45.19$45.19190,800
2024-11-27$45.21$45.21439,700
2024-11-26$44.22$44.22283,600
2024-11-25$44.64$44.64666,200
2024-11-22$45.46$45.46410,700
2024-11-21$44.55$44.55364,200
2024-11-20$44.09$44.09607,100
2024-11-19$43.62$43.62432,600
2024-11-18$44.16$44.16343,000
2024-11-15$44.61$44.61408,700
2024-11-14$45.06$45.06359,000
2024-11-13$45.48$45.48421,200
2024-11-12$47.71$47.71364,200
2024-11-11$48.57$48.57382,500
2024-11-08$48.31$48.31626,900
2024-11-07$46.09$46.091,367,400
2024-11-06$53.40$53.40611,800
2024-11-05$51.56$51.56199,200
2024-11-04$50.59$50.59376,600
2024-11-01$50.73$50.73181,200
2024-10-31$50.53$50.53266,300
2024-10-30$50.78$50.78289,200
2024-10-29$51.15$51.15180,800
2024-10-28$51.41$51.41337,800
2024-10-25$50.29$50.29179,600
2024-10-24$49.63$49.63465,900
2024-10-23$49.83$49.83314,500
2024-10-22$50.38$50.38188,500
2024-10-21$50.82$50.82209,000
2024-10-18$50.84$50.84245,300
2024-10-17$49.71$49.71272,800
2024-10-16$50.83$50.83283,400
2024-10-15$49.31$49.31368,000
2024-10-14$49.29$49.29284,200
2024-10-11$47.57$47.57302,000
2024-10-10$46.29$46.29295,100
2024-10-09$46.32$46.32297,800
2024-10-08$46.28$46.28212,100
2024-10-07$46.83$46.83313,100
2024-10-04$46.72$46.72167,600
2024-10-03$46.32$46.32228,300
2024-10-02$46.50$46.50348,400
2024-10-01$48.35$48.35233,300
2024-09-30$48.53$48.53266,900
2024-09-27$48.02$48.02202,900
2024-09-26$47.88$47.88207,500
2024-09-25$46.72$46.72267,300
2024-09-24$47.39$47.39256,400
2024-09-23$48.61$48.61221,300
2024-09-20$49.18$49.18990,100
2024-09-19$50.09$50.09342,600
2024-09-18$49.78$49.78565,200
2024-09-17$48.64$48.64290,200
2024-09-16$48.38$48.38402,000
2024-09-13$48.09$48.09645,100
2024-09-12$46.52$46.52652,900
2024-09-11$45.07$45.07313,600
2024-09-10$44.36$44.36277,500
2024-09-09$44.54$44.54258,500
2024-09-06$45.38$45.38239,100
2024-09-05$45.42$45.42362,500
2024-09-04$46.90$46.90219,200
2024-09-03$46.98$46.98409,400
2024-08-30$48.74$48.74205,100
2024-08-29$48.86$48.86237,600
2024-08-28$48.56$48.56228,000
2024-08-27$48.48$48.48248,800
2024-08-26$48.15$48.15359,800
2024-08-23$47.95$47.95358,600
2024-08-22$47.23$47.23321,200
2024-08-21$46.87$46.87344,200
2024-08-20$46.02$46.02375,300
2024-08-19$46.79$46.79491,500
2024-08-16$44.96$44.96387,800
2024-08-15$45.32$45.32525,100
2024-08-14$42.44$42.44251,400
2024-08-13$43.56$43.56394,400
2024-08-12$43.25$43.25278,400
2024-08-09$42.85$42.85365,600
2024-08-08$44.06$44.06789,200
2024-08-07$38.89$38.89470,400
2024-08-06$39.40$39.40522,600
2024-08-05$40.41$40.41474,000
2024-08-02$41.57$41.57397,100
2024-08-01$42.45$42.45415,400
2024-07-31$43.52$43.52747,700
2024-07-30$43.52$43.52463,200
2024-07-29$42.10$42.10200,400
2024-07-26$42.48$42.48293,600
2024-07-25$42.14$42.14453,100
2024-07-24$41.19$41.19355,500
2024-07-23$40.55$40.55311,900
2024-07-22$40.67$40.67331,900
2024-07-19$39.61$39.61314,400
2024-07-18$39.75$39.75438,300
2024-07-17$39.42$39.42398,200
2024-07-16$39.64$39.64227,600
2024-07-15$38.76$38.76315,500
2024-07-12$38.70$38.70374,600
2024-07-11$39.17$39.17424,900
2024-07-10$37.38$37.38406,600
2024-07-09$36.99$36.99717,700
2024-07-08$37.37$37.37376,300
2024-07-05$37.75$37.75389,000
2024-07-03$38.56$38.56284,300
2024-07-02$37.58$37.58599,800
2024-07-01$38.51$38.51731,800
2024-06-28$40.00$40.00602,900
2024-06-27$40.35$40.35403,900
2024-06-26$40.03$40.03231,500
2024-06-25$40.58$40.58226,200
2024-06-24$40.84$40.84336,100
2024-06-21$40.45$40.45444,500
2024-06-20$39.78$39.78249,300
2024-06-18$40.05$40.05273,300
2024-06-17$40.54$40.54258,800
2024-06-14$40.49$40.49274,100
2024-06-13$40.63$40.63346,500
2024-06-12$40.45$40.45287,500
2024-06-11$41.14$41.14306,200
2024-06-10$41.64$41.64472,600
2024-06-07$40.71$40.71350,000
2024-06-06$40.95$40.95313,500
2024-06-05$42.04$42.04478,800
2024-06-04$42.22$42.22584,000
2024-06-03$42.25$42.25409,100
2024-05-31$42.33$42.33352,400
2024-05-30$42.15$42.15148,100
2024-05-29$41.64$41.64201,600
2024-05-28$41.98$41.98377,100
2024-05-24$43.26$43.26226,500
2024-05-23$43.35$43.35247,800
2024-05-22$43.46$43.46325,100
2024-05-21$41.91$41.91286,000
2024-05-20$43.07$43.07269,700
2024-05-17$43.48$43.48328,500
2024-05-16$42.74$42.74376,700
2024-05-15$42.44$42.44465,000
2024-05-14$41.30$41.30566,200
2024-05-13$42.37$42.37378,400
2024-05-10$42.21$42.21595,800
2024-05-09$42.43$42.43450,900
2024-05-08$42.21$42.21433,700
2024-05-07$42.77$42.77250,400
2024-05-06$42.68$42.68209,600
2024-05-03$42.46$42.46353,200
2024-05-02$42.66$42.66280,800
2024-05-01$42.08$42.08435,000
2024-04-30$41.25$41.25354,800
2024-04-29$42.02$42.02344,900
2024-04-26$41.11$41.11263,600
2024-04-25$40.83$40.83236,100
2024-04-24$41.00$41.00218,300
2024-04-23$40.91$40.91210,200
2024-04-22$40.17$40.17345,100
2024-04-19$40.01$40.01410,100
2024-04-18$38.65$38.65329,500
2024-04-17$40.05$40.05494,600
2024-04-16$40.90$40.90305,200
2024-04-15$40.78$40.78403,700
2024-04-12$39.62$39.62392,100
2024-04-11$40.15$40.15375,300
2024-04-10$40.05$40.05403,800
2024-04-09$40.90$40.90279,700
2024-04-08$41.05$41.05230,900
2024-04-05$41.79$41.79369,000
2024-04-04$41.52$41.52315,000
2024-04-03$41.94$41.94280,300
2024-04-02$42.32$42.32421,300
2024-04-01$43.44$43.44312,300
2024-03-28$43.91$43.91453,300
2024-03-27$43.52$43.52419,300
2024-03-26$43.21$43.21365,300
2024-03-25$43.63$43.63285,500
2024-03-22$43.70$43.70310,900
2024-03-21$44.53$44.53315,200
2024-03-20$44.03$44.03316,800
2024-03-19$44.57$44.57410,600
2024-03-18$42.85$42.85322,800
2024-03-15$43.05$43.05704,100
2024-03-14$43.19$43.19447,200
2024-03-13$43.55$43.55419,700
2024-03-12$44.15$44.15524,300
2024-03-11$43.81$43.81571,300
2024-03-08$45.67$45.67427,500
2024-03-07$46.76$46.76459,500
2024-03-06$46.31$46.31510,900
2024-03-05$47.33$47.33517,500
2024-03-04$46.68$46.68658,300
2024-03-01$46.22$46.221,132,700
2024-02-29$46.57$46.571,798,000
2024-02-28$54.74$54.74378,200
2024-02-27$55.44$55.44501,900
2024-02-26$55.09$55.09368,100
2024-02-23$53.41$53.41289,100
2024-02-22$51.91$51.91432,100
2024-02-21$51.25$51.25469,000
2024-02-20$52.45$52.45422,900
2024-02-16$54.06$54.06348,800
2024-02-15$55.51$55.51376,900
2024-02-14$54.93$54.93243,100
2024-02-13$54.75$54.75358,300
2024-02-12$56.02$56.02325,700
2024-02-09$55.61$55.61354,500
2024-02-08$54.60$54.60377,000
2024-02-07$52.96$52.96319,500
2024-02-06$52.49$52.49590,400
2024-02-05$52.35$52.35361,600
2024-02-02$52.80$52.80387,000
2024-02-01$53.49$53.49392,100
2024-01-31$53.36$53.36367,100
2024-01-30$54.94$54.94384,100
2024-01-29$55.39$55.391,156,500
2024-01-26$53.88$53.88538,200
2024-01-25$53.24$53.24361,000
2024-01-24$55.22$55.22210,800
2024-01-23$55.45$55.45201,900
2024-01-22$55.92$55.92289,700
2024-01-19$55.04$55.04438,500
2024-01-18$56.43$56.43308,100
2024-01-17$56.14$56.14345,500
2024-01-16$55.50$55.50417,900
2024-01-12$54.21$54.21606,000
2024-01-11$54.03$54.03719,800
2024-01-10$54.82$54.821,212,100
2024-01-09$56.82$56.82625,300
2024-01-08$59.45$59.45965,000
2024-01-05$62.74$62.74614,000
2024-01-04$63.45$63.45541,800
2024-01-03$61.04$61.04524,700
2024-01-02$62.29$62.29428,700