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Amphastar Pharmaceuticals (AMPH) Stock Chart & Stock Price History

Amphastar Pharmaceuticals logo
$18.16 +0.08 (+0.44%)
Closing price 04:00 PM Eastern
Extended Trading
$18.16 0.00 (0.00%)
As of 04:28 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.

Amphastar Pharmaceuticals Stock Price Performance

The Amphastar Pharmaceuticals (AMPH) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 24.83%, with a year-to-date return of -32.19%. In the past month, the stock has decreased 14.38%, reflecting recent market activity.

As of the latest close, Amphastar Pharmaceuticals traded at $18.08 with a market cap of $797.20 million and volume of 868,757 shares. Five years ago, the stock traded at $19.72, representing a 7.91% decrease over that period. At the time, it had a market cap of $939.36 million and a volume of 208,722 shares.

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5 Day
Performance
+7.65%
1 Month
Performance
-14.38%
3 Month
Performance
-36.35%
Year-To-Date
Performance
-32.19%
1 Year
Performance
-24.83%
5 Year
Performance
-7.91%

AMPH Stock Chart for Thursday, May, 21, 2026

Amphastar Pharmaceuticals Stock Price History

DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization
05/20/2026$17.82$18.08
+1.46%
$18.19$17.70868,757 shs$797.20 million
05/19/2026$17.20$17.82
+3.60%
$17.91$17.00725,147 shs$785.68 million
05/18/2026$16.87$17.20
+1.96%
$17.31$16.65866,025 shs$758.35 million
05/15/2026$17.30$16.87
-2.49%
$17.53$16.75679,289 shs$743.80 million
05/14/2026$18.32$17.30
-5.57%
$18.08$17.26739,074 shs$762.81 million
05/13/2026$17.50$18.32
+4.69%
$18.57$17.43971,190 shs$807.73 million
05/12/2026$18.45$17.50
-5.15%
$18.58$17.261.22 million shs$771.58 million
05/11/2026$19.00$18.45
-2.89%
$19.41$18.331.36 million shs$821.67 million
05/08/2026$24.03$19.00
-20.93%
$19.53$18.281.98 million shs$1.07 billion
05/07/2026$23.90$24.03
+0.54%
$24.35$23.87373,406 shs$1.07 billion
05/06/2026$23.39$23.90
+2.18%
$24.15$23.50392,763 shs$1.06 billion
05/05/2026N/A$23.39$23.46$22.75366,944 shs$1.04 billion
04/30/2026$21.63$21.96
+1.53%
$22.36$21.57407,243 shs$977.99 million
04/29/2026$21.82$21.63
-0.87%
$21.86$21.48268,688 shs$963.29 million
04/28/2026$21.65$21.82
+0.79%
$22.04$21.56281,226 shs$971.65 million
04/27/2026$21.41$21.65
+1.12%
$22.06$21.46329,613 shs$964.07 million
04/24/2026$21.01$21.41
+1.90%
$21.60$20.77429,698 shs$953.39 million
04/23/2026$20.99$21.01
+0.10%
$21.23$20.77302,570 shs$935.68 million
04/22/2026$21.21$20.99
-1.04%
$21.59$20.77410,802 shs$934.69 million
04/21/2026$22.92$21.21
-7.46%
$22.66$21.10684,196 shs$944.48 million
04/20/2026$22.88$22.92
+0.17%
$23.26$22.54542,049 shs$1.02 billion

This page (NASDAQ:AMPH) was last updated on 5/21/2026 by MarketBeat.com Staff.
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