Amphastar Pharmaceuticals (AMPH) Stock Chart & Stock Price History $31.28 -0.02 (-0.06%) Closing price 04:00 PM EasternExtended Trading$31.28 +0.00 (+0.02%) As of 05:16 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 InterestSustainabilityTrends Amphastar Pharmaceuticals Stock Price Performance 5 Day Performance+0.73%1 Month Performance-13.28%3 Month Performance-29.74%6 Month Performance-33.34%Year-To-Date Performance-15.85%1 Year Performance-39.03% 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 Friday, February, 21, 2025 AMPH Chart by TradingView 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 Capitalization02/20/2025$31.21$31.30+0.29%$31.41$30.95550,079 shs$1.50 billion02/19/2025$30.75$31.21+1.50%$31.45$30.65661,917 shs$1.50 billion02/18/2025$31.02$30.75-0.87%$31.65$30.34977,551 shs$1.48 billion02/17/2025$31.02$31.02$31.90$30.95550,006 shs$1.49 billion02/14/2025$31.74$31.02-2.27%$31.90$30.95550,006 shs$1.49 billion02/13/2025$31.82$31.74-0.25%$31.95$31.46316,789 shs$1.53 billion02/12/2025$32.21$31.82-1.21%$32.40$31.75358,756 shs$1.53 billion02/11/2025$32.21$32.21$32.25$31.55435,624 shs$1.55 billion02/10/2025$32.37$32.21-0.49%$32.48$31.76319,637 shs$1.55 billion02/07/2025$32.79$32.37-1.28%$32.95$32.16311,540 shs$1.56 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. 02/06/2025$32.79$32.79$33.42$32.60349,601 shs$1.58 billion02/05/2025$33.19$32.79-1.21%$33.35$32.50356,033 shs$1.58 billion02/04/2025$33.39$33.19-0.60%$33.76$32.25440,763 shs$1.60 billion02/03/2025$34.87$33.39-4.24%$34.39$32.88605,342 shs$1.61 billion01/31/2025$36.37$34.87-4.12%$36.35$34.75517,532 shs$1.68 billion01/30/2025$36.42$36.37-0.14%$37.04$36.06421,749 shs$1.75 billion01/29/2025$37.12$36.42-1.89%$37.28$36.40425,134 shs$1.75 billion01/28/2025$37.11$37.12+0.03%$37.38$36.53444,705 shs$1.78 billion01/27/2025$36.50$37.11+1.67%$37.66$36.48421,381 shs$1.78 billion01/24/2025$36.39$36.50+0.30%$36.84$35.79588,469 shs$1.75 billion01/23/2025$36.14$36.39+0.69%$36.66$35.84350,577 shs$1.75 billion01/22/2025$36.03$36.14+0.31%$36.30$35.56358,088 shs$1.74 billion01/21/2025$35.70$36.03+0.92%$36.31$35.46474,834 shs$1.73 billion01/20/2025$35.70$35.70$35.96$35.27410,479 shs$1.72 billion Related Companies TLX Stock Chart ELAN Stock Chart LNTH Stock Chart NUVL Stock Chart CYTK Stock Chart VRNA Stock Chart GRFS Stock Chart TGTX Stock Chart KRYS Stock Chart SWTX 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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