Amphastar Pharmaceuticals, Inc. (AMPH) NASDAQ
Currency In USD
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AMPH Historical Return
If you invested $1000 in Amphastar Pharmaceuticals, Inc. (AMPH) 10 years ago, it would be worth $1,406.39 as of October 22, 2026, based on a reinvested dividends scenario. Over the same period, a $1000 investment made 5 years ago would be worth $1,354.35, while $1000 invested 1 year ago would be worth $1,059.95. This corresponds to total returns of 40.64%, 35.44%, 6%, respectively, with annualized returns of 3.47%, 6.25%, 6%.
Custom investment amounts or purchase dates can also be explored using the Stoculator calculator. Past performance does not guarantee future results.
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AMPH Historical Data
Date Range:
| Date | Open | Close | Adj Close | High | Low | Volume |
|---|---|---|---|---|---|---|
| October 22, 2026 | 26.25 | 26.04 | 26.04 | 26.5 | 25.92 | 315,004 |
| October 21, 2026 | 25.69 | 26.2 | 26.2 | 26.35 | 25.51 | 390,201 |
| October 20, 2026 | 26.24 | 25.94 | 25.94 | 26.61 | 25.82 | 360,167 |
| October 19, 2026 | 25.63 | 26.14 | 26.14 | 26.31 | 25.63 | 299,509 |
| October 16, 2026 | 26.61 | 25.87 | 25.87 | 26.61 | 25.52 | 351,983 |
| October 15, 2026 | 26.38 | 26.42 | 26.42 | 27.1 | 26.13 | 352,334 |
| October 14, 2026 | 25.89 | 26.08 | 26.08 | 26.57 | 25.89 | 364,652 |
| October 13, 2026 | 26.91 | 26.05 | 26.05 | 27 | 26.03 | 326,542 |
| October 12, 2026 | 26.62 | 26.76 | 26.76 | 26.86 | 26.51 | 362,817 |
| October 09, 2026 | 25.73 | 26.62 | 26.62 | 26.79 | 25.65 | 270,994 |
| October 08, 2026 | 25.39 | 25.81 | 25.81 | 26.14 | 25.1 | 422,785 |
| October 07, 2026 | 25.91 | 25.54 | 25.54 | 26.17 | 25.29 | 775,021 |
| October 06, 2026 | 25.54 | 25.91 | 25.91 | 26.13 | 25.03 | 467,663 |
| October 05, 2026 | 25.43 | 25.37 | 25.37 | 25.7 | 25.17 | 453,640 |
| October 02, 2026 | 25.46 | 25.43 | 25.43 | 25.55 | 25.06 | 372,329 |
| October 01, 2026 | 25.6 | 25.35 | 25.35 | 26.02 | 25.3 | 528,692 |
| September 30, 2026 | 26.73 | 25.81 | 25.81 | 26.79 | 25.77 | 504,656 |
| September 29, 2026 | 27.59 | 26.68 | 26.68 | 27.64 | 26.52 | 626,950 |
| September 28, 2026 | 25.99 | 27.39 | 27.39 | 27.8 | 25.96 | 747,916 |
| September 25, 2026 | 26.25 | 26.13 | 26.13 | 26.63 | 25.66 | 370,895 |
| September 24, 2026 | 24.81 | 26.27 | 26.27 | 26.31 | 24.65 | 568,868 |
| September 23, 2026 | 24.39 | 24.96 | 24.96 | 25.12 | 24.2 | 504,549 |
| September 22, 2026 | 24.6 | 24.32 | 24.32 | 24.83 | 24.1 | 496,747 |
| September 21, 2026 | 24.14 | 24.48 | 24.48 | 25.41 | 24.05 | 563,575 |
| September 18, 2026 | 23.69 | 23.62 | 23.62 | 23.99 | 23.51 | 1.45M |
| September 17, 2026 | 24.08 | 23.82 | 23.82 | 24.18 | 23.5 | 451,995 |
| September 16, 2026 | 23.64 | 23.95 | 23.95 | 24.39 | 23.49 | 502,992 |
| September 15, 2026 | 23.75 | 23.64 | 23.64 | 23.94 | 23.56 | 347,395 |
| September 11, 2026 | 23.65 | 23.78 | 23.78 | 23.8 | 23.24 | 403,846 |
| September 10, 2026 | 23 | 23.54 | 23.54 | 23.69 | 22.76 | 495,998 |
| September 09, 2026 | 22.84 | 23.04 | 23.04 | 23.07 | 22.57 | 343,408 |
| September 08, 2026 | 22.82 | 22.93 | 22.93 | 23.14 | 22.3 | 451,310 |
| September 04, 2026 | 23.47 | 23.18 | 23.18 | 23.74 | 23.07 | 626,116 |
| September 03, 2026 | 23.88 | 23.84 | 23.84 | 23.92 | 23.04 | 432,319 |
| September 02, 2026 | 23.05 | 23.74 | 23.74 | 23.83 | 23.03 | 436,696 |
| September 01, 2026 | 22.59 | 22.96 | 22.96 | 23.05 | 22.59 | 349,055 |
| August 31, 2026 | 21.86 | 22.53 | 22.53 | 22.65 | 21.52 | 274,024 |
| August 28, 2026 | 21.88 | 22.01 | 22.01 | 22.15 | 21.69 | 224,528 |
| August 27, 2026 | 21.69 | 21.88 | 21.88 | 21.97 | 21.63 | 259,781 |
| August 26, 2026 | 21.86 | 22.02 | 22.02 | 22.44 | 21.72 | 395,567 |
| August 25, 2026 | 21.5 | 21.98 | 21.98 | 22.07 | 21.41 | 283,773 |
| August 24, 2026 | 21.6 | 21.52 | 21.52 | 21.81 | 21.26 | 210,262 |
| August 21, 2026 | 21.64 | 21.6 | 21.6 | 22.2 | 21.44 | 376,557 |
| August 20, 2026 | 21.38 | 21.68 | 21.68 | 21.76 | 21.24 | 338,696 |
| August 19, 2026 | 21.64 | 21.74 | 21.74 | 21.99 | 21.15 | 410,770 |
| August 18, 2026 | 21.11 | 21.34 | 21.34 | 21.59 | 21.08 | 411,802 |
| August 17, 2026 | 20.9 | 20.86 | 20.86 | 21.23 | 20.77 | 533,504 |
| August 14, 2026 | 20.02 | 20.91 | 20.91 | 21.07 | 19.89 | 305,681 |
| August 13, 2026 | 20.18 | 20.18 | 20.18 | 20.27 | 19.84 | 307,442 |
| August 12, 2026 | 20.16 | 19.98 | 19.98 | 20.22 | 19.61 | 341,042 |
| August 11, 2026 | 20.02 | 20.42 | 20.42 | 20.57 | 20 | 0 |
| August 10, 2026 | 20.74 | 20.31 | 20.31 | 20.9 | 19.55 | 645,738 |
| August 07, 2026 | 22.48 | 20.78 | 20.78 | 22.65 | 20.4 | 1.3M |
| August 06, 2026 | 20.22 | 19.81 | 19.81 | 20.25 | 19.6 | 526,645 |
| August 05, 2026 | 20.06 | 20.24 | 20.24 | 20.28 | 19.88 | 351,618 |
| August 04, 2026 | 20.11 | 19.9 | 19.9 | 20.38 | 19.86 | 481,647 |
| August 03, 2026 | 20.11 | 20.22 | 20.22 | 20.45 | 19.7 | 413,179 |
| July 31, 2026 | 20.35 | 19.94 | 19.94 | 20.41 | 19.67 | 367,623 |
| July 30, 2026 | 20.31 | 20.38 | 20.38 | 20.53 | 19.95 | 355,683 |
| July 29, 2026 | 20.24 | 20.58 | 20.58 | 20.7 | 19.99 | 321,672 |
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