Amphastar Pharmaceuticals (AMPH) Stock Chart & Stock Price History $23.50 -0.92 (-3.77%) Closing price 04:00 PM EasternExtended Trading$25.55 +2.05 (+8.72%) As of 06:18 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 Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Amphastar Pharmaceuticals Stock Price Performance 5 Day Performance+2.15%1 Month Performance-9.88%3 Month Performance-33.71%6 Month Performance-51.28%Year-To-Date Performance-35.29%1 Year Performance-41.09% Receive AMPH Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. Email Address AMPH Stock Chart for Tuesday, April, 15, 2025 AMPH Chart by TradingViewRemove Ads Amphastar Pharmaceuticals Stock Price History Daily Weekly Monthly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year Time Frame * Start Date * End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization04/14/2025$24.16$24.42+1.08%$24.77$23.94523,510 shs$1.16 billion04/11/2025$23.52$24.16+2.72%$24.22$23.35482,792 shs$1.15 billion04/10/2025$25.23$23.52-6.78%$25.01$22.74840,588 shs$1.12 billion04/09/2025$23.75$25.23+6.23%$25.51$23.361.01 million shs$1.20 billion04/09/2025$23.75$25.23+6.23%$25.51$23.361.01 million shs$1.20 billion04/08/2025$25.00$23.75-5.00%$25.66$23.72972,673 shs$1.13 billion04/08/2025$25.00$23.75-5.00%$25.66$23.72972,673 shs$1.13 billion04/07/2025$26.61$25.00-6.05%$25.95$24.711.29 million shs$1.19 billion04/04/2025$27.24$26.61-2.31%$27.02$26.14699,408 shs$1.27 billion04/03/2025$27.80$27.24-2.01%$28.06$26.88605,671 shs$1.30 billion Get the Latest News and Ratings for AMPH and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 04/02/2025$28.29$27.80-1.73%$28.29$27.02717,774 shs$1.32 billion04/01/2025$28.99$28.29-2.41%$29.27$28.17785,073 shs$1.35 billion03/31/2025$28.43$28.99+1.97%$29.18$28.01547,881 shs$1.38 billion03/28/2025$28.50$28.43-0.25%$28.71$28.23386,842 shs$1.35 billion03/27/2025$28.37$28.50+0.46%$28.75$28.26457,497 shs$1.36 billion03/26/2025$28.39$28.37-0.07%$28.83$28.02437,895 shs$1.35 billion03/25/2025$28.46$28.39-0.25%$28.66$27.80713,226 shs$1.35 billion03/24/2025$28.29$28.46+0.60%$28.65$28.07537,620 shs$1.36 billion03/21/2025$27.91$28.29+1.36%$28.44$27.661.48 million shs$1.35 billion03/20/2025$27.86$27.91+0.18%$28.38$27.69406,990 shs$1.33 billion03/19/2025$27.36$27.86+1.83%$27.87$27.09471,499 shs$1.33 billion03/18/2025$27.69$27.36-1.19%$27.81$27.22602,473 shs$1.30 billion03/17/2025$26.66$27.69+3.86%$27.98$26.68648,301 shs$1.32 billion03/14/2025$26.24$26.66+1.60%$26.76$26.14500,710 shs$1.27 billion Related Companies ELAN Stock Chart PCVX Stock Chart RYTM Stock Chart PTCT Stock Chart ZLAB Stock Chart ACLX Stock Chart RARE Stock Chart RNA Stock Chart AKRO Stock Chart MRUS Stock Chart Receive AMPH Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 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