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 — 2021

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2021-12-31$23.29$23.29212,900
2021-12-30$23.14$23.14213,000
2021-12-29$22.94$22.94166,800
2021-12-28$22.84$22.84159,600
2021-12-27$22.87$22.87138,100
2021-12-23$22.59$22.59123,100
2021-12-22$22.71$22.71195,700
2021-12-21$22.19$22.19205,200
2021-12-20$22.19$22.19202,700
2021-12-17$21.83$21.83632,100
2021-12-16$21.67$21.67228,300
2021-12-15$22.35$22.35287,800
2021-12-14$21.60$21.60171,900
2021-12-13$21.42$21.42155,800
2021-12-10$21.49$21.49193,700
2021-12-09$21.41$21.41240,000
2021-12-08$21.28$21.28129,200
2021-12-07$21.09$21.09204,300
2021-12-06$20.87$20.87202,800
2021-12-03$20.41$20.41179,200
2021-12-02$20.10$20.10228,300
2021-12-01$19.86$19.86203,200
2021-11-30$19.56$19.56306,000
2021-11-29$19.48$19.48251,400
2021-11-26$19.91$19.91120,600
2021-11-24$20.92$20.92121,300
2021-11-23$21.18$21.18168,500
2021-11-22$21.08$21.08246,500
2021-11-19$20.51$20.51422,300
2021-11-18$20.10$20.10294,200
2021-11-17$20.92$20.92287,800
2021-11-16$21.26$21.26181,500
2021-11-15$21.15$21.15306,200
2021-11-12$21.30$21.30240,100
2021-11-11$21.18$21.18441,300
2021-11-10$21.15$21.15341,300
2021-11-09$20.76$20.76475,500
2021-11-08$19.95$19.95126,500
2021-11-05$20.08$20.08139,100
2021-11-04$19.76$19.76105,300
2021-11-03$19.58$19.5899,300
2021-11-02$19.23$19.2376,800
2021-11-01$18.88$18.88128,200
2021-10-29$18.68$18.68201,500
2021-10-28$18.14$18.1489,800
2021-10-27$18.36$18.36196,200
2021-10-26$18.92$18.92109,200
2021-10-25$19.10$19.1098,700
2021-10-22$19.19$19.19103,700
2021-10-21$19.26$19.26105,100
2021-10-20$19.45$19.45110,700
2021-10-19$19.11$19.1162,000
2021-10-18$19.03$19.0383,200
2021-10-15$19.11$19.11105,100
2021-10-14$19.23$19.2398,700
2021-10-13$19.22$19.2268,800
2021-10-12$19.24$19.2498,900
2021-10-11$19.43$19.4386,000
2021-10-08$19.46$19.4678,600
2021-10-07$19.25$19.25101,200
2021-10-06$19.15$19.15142,500
2021-10-05$18.84$18.84223,600
2021-10-04$19.10$19.10159,300
2021-10-01$19.35$19.35154,200
2021-09-30$19.01$19.01158,100
2021-09-29$19.21$19.2184,200
2021-09-28$18.91$18.91164,900
2021-09-27$19.26$19.26168,900
2021-09-24$18.71$18.7176,900
2021-09-23$18.68$18.6892,800
2021-09-22$18.45$18.4589,600
2021-09-21$18.45$18.45104,800
2021-09-20$18.71$18.71196,400
2021-09-17$18.37$18.37486,600
2021-09-16$17.93$17.93116,400
2021-09-15$17.88$17.88116,000
2021-09-14$17.98$17.98126,100
2021-09-13$18.45$18.45183,900
2021-09-10$17.83$17.83152,500
2021-09-09$18.05$18.05177,300
2021-09-08$18.72$18.72155,400
2021-09-07$18.80$18.80149,600
2021-09-03$19.27$19.27125,700
2021-09-02$19.53$19.53253,000
2021-09-01$19.74$19.74156,300
2021-08-31$19.66$19.66176,200
2021-08-30$19.38$19.38156,300
2021-08-27$19.30$19.30210,500
2021-08-26$18.90$18.90143,000
2021-08-25$18.86$18.86103,400
2021-08-24$19.22$19.22107,400
2021-08-23$19.17$19.1797,300
2021-08-20$18.89$18.89204,400
2021-08-19$18.68$18.68109,100
2021-08-18$19.08$19.08130,800
2021-08-17$19.16$19.16122,500
2021-08-16$19.33$19.33109,600
2021-08-13$19.60$19.60115,100
2021-08-12$19.53$19.53152,300
2021-08-11$19.92$19.92128,300
2021-08-10$20.32$20.32176,100
2021-08-09$20.08$20.08108,100
2021-08-06$20.31$20.31176,400
2021-08-05$20.35$20.35149,000
2021-08-04$20.68$20.68147,800
2021-08-03$21.49$21.49389,500
2021-08-02$21.24$21.24380,100
2021-07-30$20.95$20.95278,800
2021-07-29$20.77$20.77135,600
2021-07-28$20.90$20.90197,500
2021-07-27$20.79$20.79194,000
2021-07-26$20.69$20.69174,500
2021-07-23$20.86$20.86243,100
2021-07-22$20.41$20.41122,600
2021-07-21$20.43$20.43130,100
2021-07-20$20.16$20.16233,900
2021-07-19$20.02$20.02146,500
2021-07-16$20.06$20.06139,100
2021-07-15$20.02$20.02220,200
2021-07-14$20.01$20.01125,400
2021-07-13$19.89$19.89141,000
2021-07-12$20.03$20.03167,500
2021-07-09$20.06$20.06270,600
2021-07-08$20.41$20.41191,000
2021-07-07$20.35$20.35131,400
2021-07-06$20.49$20.49121,300
2021-07-02$20.61$20.61167,800
2021-07-01$20.44$20.44137,900
2021-06-30$20.16$20.16221,300
2021-06-29$20.29$20.29324,900
2021-06-28$20.76$20.76195,500
2021-06-25$20.92$20.921,623,300
2021-06-24$20.88$20.88311,900
2021-06-23$20.31$20.31236,600
2021-06-22$20.20$20.20156,700
2021-06-21$20.18$20.18221,200
2021-06-18$20.17$20.171,036,200
2021-06-17$20.39$20.39289,200
2021-06-16$20.13$20.13322,600
2021-06-15$19.98$19.98231,500
2021-06-14$19.68$19.68170,600
2021-06-11$19.92$19.92244,800
2021-06-10$19.70$19.70180,500
2021-06-09$19.69$19.69186,200
2021-06-08$19.43$19.43246,900
2021-06-07$19.52$19.52288,700
2021-06-04$18.79$18.79149,300
2021-06-03$18.66$18.66191,100
2021-06-02$18.85$18.85246,800
2021-06-01$19.08$19.08336,500
2021-05-28$18.92$18.9297,900
2021-05-27$19.01$19.01179,500
2021-05-26$19.34$19.34102,500
2021-05-25$19.38$19.38144,100
2021-05-24$19.76$19.7680,200
2021-05-21$19.72$19.72208,700
2021-05-20$19.69$19.69148,100
2021-05-19$19.82$19.82137,800
2021-05-18$19.67$19.67108,700
2021-05-17$19.96$19.96284,400
2021-05-14$19.97$19.97227,200
2021-05-13$19.56$19.56206,000
2021-05-12$19.08$19.08180,600
2021-05-11$18.98$18.98279,900
2021-05-10$19.15$19.15163,300
2021-05-07$18.68$18.68220,300
2021-05-06$18.05$18.05116,500
2021-05-05$17.95$17.95113,900
2021-05-04$18.13$18.13180,600
2021-05-03$17.49$17.49308,400
2021-04-30$17.40$17.40134,800
2021-04-29$17.57$17.5782,900
2021-04-28$17.39$17.39119,500
2021-04-27$17.16$17.1696,800
2021-04-26$17.32$17.32152,800
2021-04-23$17.32$17.32133,900
2021-04-22$17.60$17.60155,800
2021-04-21$17.56$17.56129,300
2021-04-20$17.14$17.14142,300
2021-04-19$17.30$17.30149,000
2021-04-16$17.30$17.30122,000
2021-04-15$17.35$17.35120,500
2021-04-14$17.40$17.40117,200
2021-04-13$17.33$17.33156,300
2021-04-12$17.11$17.11263,100
2021-04-09$17.89$17.8996,000
2021-04-08$17.78$17.78145,800
2021-04-07$17.74$17.74113,400
2021-04-06$17.63$17.63123,100
2021-04-05$17.68$17.68124,500
2021-04-01$18.09$18.09176,800
2021-03-31$18.32$18.32255,600
2021-03-30$18.00$18.0078,000
2021-03-29$18.11$18.11195,500
2021-03-26$18.04$18.0494,400
2021-03-25$17.90$17.90117,200
2021-03-24$17.66$17.66134,700
2021-03-23$17.99$17.99137,500
2021-03-22$18.49$18.49153,400
2021-03-19$18.07$18.07535,700
2021-03-18$17.91$17.91187,900
2021-03-17$17.99$17.99203,300
2021-03-16$18.44$18.44218,900
2021-03-15$19.15$19.15177,000
2021-03-12$19.36$19.36141,300
2021-03-11$19.04$19.04165,200
2021-03-10$18.78$18.78180,300
2021-03-09$18.79$18.79281,500
2021-03-08$17.96$17.96196,500
2021-03-05$17.52$17.52222,300
2021-03-04$17.21$17.21200,800
2021-03-03$17.78$17.78212,000
2021-03-02$17.37$17.371,418,900
2021-03-01$17.48$17.48304,400
2021-02-26$17.53$17.53388,600
2021-02-25$17.89$17.89121,300
2021-02-24$18.35$18.35128,500
2021-02-23$17.77$17.77176,400
2021-02-22$18.11$18.11178,500
2021-02-19$18.48$18.48352,900
2021-02-18$18.35$18.35154,000
2021-02-17$18.70$18.70114,200
2021-02-16$18.41$18.41166,900
2021-02-12$18.88$18.88113,100
2021-02-11$19.14$19.14173,100
2021-02-10$18.83$18.83135,700
2021-02-09$18.93$18.93100,700
2021-02-08$18.86$18.86126,000
2021-02-05$19.07$19.07137,300
2021-02-04$18.99$18.99213,000
2021-02-03$18.42$18.42140,400
2021-02-02$18.57$18.57111,200
2021-02-01$18.46$18.46199,500
2021-01-29$18.18$18.18109,200
2021-01-28$18.57$18.57147,900
2021-01-27$18.83$18.83144,900
2021-01-26$19.12$19.1284,700
2021-01-25$19.04$19.04127,100
2021-01-22$18.70$18.70156,500
2021-01-21$18.43$18.43179,300
2021-01-20$18.53$18.53229,300
2021-01-19$18.64$18.64246,300
2021-01-15$18.69$18.69155,300
2021-01-14$19.26$19.26189,000
2021-01-13$19.39$19.39158,900
2021-01-12$19.52$19.52120,100
2021-01-11$19.53$19.53150,400
2021-01-08$19.80$19.80306,700
2021-01-07$20.65$20.65191,300
2021-01-06$20.10$20.10376,200
2021-01-05$20.02$20.02178,200
2021-01-04$20.14$20.14298,700