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| Home | Free Dividend Report | Stock Splits Calendar | AMPH Historical Stock Prices | Preferred Stock Newsletter | AMPH Options Chain | Stock Message Boards |
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 Amphastar Pharmaceuticals (AMPH) has the following price history information. Looking back at AMPH historical stock prices for the last five trading days, on August 03, 2026, AMPH opened at $20.11, traded as high as $20.46 and as low as $19.70, and closed at $20.22. Trading volume was a total of 413.20K shares. On August 04, 2026, AMPH opened at $20.11, traded as high as $20.38 and as low as $19.86, and closed at $19.90. Trading volume was a total of 481.60K shares. On August 05, 2026, AMPH opened at $20.06, traded as high as $20.28 and as low as $19.88, and closed at $20.24. Trading volume was a total of 351.60K shares. On August 06, 2026, AMPH opened at $20.22, traded as high as $20.25 and as low as $19.60, and closed at $19.81. Trading volume was a total of 527.30K shares. On August 07, 2026, AMPH opened at $22.48, traded as high as $22.65 and as low as $20.40, and closed at $20.78. Trading volume was a total of 1.30M shares.
AMPH Historical Stock Prices By Date: Below, we examine the compound annual growth rate — CAGR for short — of an investment into Amphastar Pharmaceuticals shares, starting with a $10,000 purchase of AMPH, and working forward through the historical stock price information to today.
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Video: Compound Annual Growth Rate (CAGR) Definition
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