Amphastar Pharmaceuticals (AMPH) Stock Chart & Stock Price History $23.18 -0.41 (-1.72%) Closing price 07/3/2025 03:50 PM EasternExtended Trading$23.18 0.00 (0.00%) As of 07/3/2025 04:53 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 The Amphastar Pharmaceuticals (AMPH) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 38.61%, with a year-to-date return of -37.58%. In the past month, the stock has decreased 10.83%, reflecting recent market activity. As of the latest close, Amphastar Pharmaceuticals traded at $23.18 with a market cap of $1.09 billion and volume of 221,782 shares. Five years ago, the stock traded at $21.92, representing a 5.73% increase over that period. At the time, it had a market cap of $1.01 billion and a volume of 252,800 shares. 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 5 Day Performance-0.71%1 Month Performance-10.83%3 Month Performance-12.91%Year-To-Date Performance-37.58%1 Year Performance-38.61%5 Year Performance+5.73% AMPH Stock Chart for Sunday, July, 6, 2025 AMPH Chart by TradingView Amphastar Pharmaceuticals Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization07/04/2025$23.18$23.18$23.77$22.92221,782 shs$1.09 billion07/03/2025$23.58$23.18-1.72%$23.77$22.92221,782 shs$1.09 billion07/02/2025$23.34$23.58+1.03%$23.72$23.20465,368 shs$1.11 billion07/01/2025$22.96$23.34+1.66%$24.52$22.89444,408 shs$1.10 billion06/30/2025$23.08$22.96-0.52%$23.25$22.81396,102 shs$1.08 billion06/27/2025$23.18$23.08-0.43%$23.42$22.861.27 million shs$1.09 billion06/26/2025$23.45$23.18-1.15%$23.77$23.03517,512 shs$1.09 billion06/25/2025$24.58$23.45-4.60%$24.53$23.31426,861 shs$1.11 billion06/24/2025$24.68$24.58-0.41%$25.04$24.53395,481 shs$1.16 billion06/23/2025$24.56$24.68+0.49%$24.75$24.40409,007 shs$1.16 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. 06/20/2025$25.34$24.56-3.08%$25.85$24.35672,732 shs$1.16 billion06/19/2025$25.34$25.34$25.80$25.26393,981 shs$1.19 billion06/18/2025$25.61$25.34-1.05%$25.80$25.26393,981 shs$1.19 billion06/17/2025$25.98$25.61-1.42%$26.06$25.54399,985 shs$1.21 billion06/16/2025$25.82$25.98+0.62%$26.03$25.59365,928 shs$1.22 billion06/13/2025$26.44$25.82-2.34%$26.27$25.70402,402 shs$1.22 billion06/12/2025$26.05$26.44+1.50%$26.50$25.77506,968 shs$1.25 billion06/11/2025$26.92$26.05-3.23%$27.04$26.02528,186 shs$1.23 billion06/10/2025$26.62$26.92+1.13%$27.40$26.70624,898 shs$1.27 billion06/09/2025$25.99$26.62+2.42%$26.86$26.10514,479 shs$1.25 billion06/06/2025$25.52$25.99+1.84%$26.02$25.53359,174 shs$1.23 billion06/05/2025$25.86$25.52-1.31%$25.91$25.19555,155 shs$1.20 billion06/04/2025$26.01$25.86-0.58%$26.57$25.76395,476 shs$1.22 billion Related Companies ADMA Stock Chart PCVX Stock Chart KRYS Stock Chart RYTM Stock Chart CYTK Stock Chart PTCT Stock Chart ZLAB Stock Chart ACAD Stock Chart MRUS Stock Chart ACLX 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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