| Sep 21, 2026 SForm 4 → | Sep 23, 6:02 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 4,139 | $25.00 | $103,475 | 168,707 | −2.39% | 10b5-1 |
| Aug 7, 2026 SForm 4 → | Aug 11, 4:57 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 8,180 | $22.48 | $183,886 | 172,846 | −4.52% | 10b5-1 |
| Aug 7, 2026 MForm 4 → | Aug 11, 4:57 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 5,053 | $19.79 | $99,999 | 181,026 | — | 10b5-1 |
| Mar 4, 2019 SForm 4 → | Mar 6, 5:20 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 1,500 | $25.36 | $38,037 | 75,550 | −1.95% | plan? |
| Mar 4, 2019 MForm 4 → | Mar 6, 5:20 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 1,500 | $13.35 | $20,025 | 77,050 | — | plan? |
| Feb 15, 2019 SForm 4 → | Feb 15, 8:09 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 10,016 | $24.37 | $244,090 | 75,550 | −11.7% | plan? |
| Feb 15, 2019 MForm 4 → | Feb 15, 8:09 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 10,016 | $13.35 | $133,714 | 85,566 | — | plan? |
| Jan 2, 2019 SForm 4 → | Jan 4, 5:04 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 3,245 | $19.52 | $63,354 | 75,550 | −4.12% | plan? |
| Dec 3, 2018 SForm 4 → | Dec 4, 9:00 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 10,000 | $22.40 | $224,001 | 78,795 | −11.3% | plan? |
| Dec 3, 2018 MForm 4 → | Dec 4, 9:00 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 10,000 | $11.33 | $113,300 | 88,795 | — | plan? |
| Nov 8, 2018 SForm 4 → | Nov 13, 5:09 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 38,484 | $20.74 | $797,972 | 78,152 | −33.0% | plan? late |
| Nov 8, 2018 MForm 4 → | Nov 13, 5:09 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 29,800 | $11.33 | $337,634 | 91,324 | — | plan? late |
| Aug 16, 2018 SForm 4 → | Aug 17, 4:05 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 2,407 | $17.59 | $42,333 | 86,836 | −2.70% | plan? |
| Jul 9, 2018 SForm 4 → | Jul 11, 4:03 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 3,250 | $16.46 | $53,498 | 89,243 | −3.51% | plan? |
| Apr 21, 2018 FForm 4 → | Apr 23, 5:11 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 1,273 | $19.31 | $24,582 | 91,374 | — | plan? |
| Mar 26, 2018 FForm 4 → | Mar 28, 5:22 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 1,677 | $18.61 | $31,209 | 92,647 | — | plan? |
| Mar 16, 2018 FForm 4 → | Mar 20, 8:04 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 6,349 | $19.91 | $126,409 | 94,324 | — | plan? |
| Mar 15, 2018 AForm 4 → | Mar 16, 6:16 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 22,359 | — | — | 100,673 | — | plan? |
| Mar 13, 2018 SForm 4 → | Mar 15, 4:16 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 19,801 | $20.10 | $398,004 | 78,314 | −20.2% | plan? |
| Mar 13, 2018 MForm 4 → | Mar 15, 4:16 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 19,801 | $11.33 | $224,345 | 98,115 | — | plan? |
| Dec 1, 2017 SForm 4 → | Dec 5, 4:30 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 6,226 | $19.67 | $122,465 | 78,314 | −7.36% | plan? |
| Oct 13, 2017 SForm 4 → | Oct 13, 8:00 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 3,026 | $18.56 | $56,176 | 83,496 | −3.50% | plan? |
| May 30, 2017 SForm 4 → | Jun 1, 8:00 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 4,297 | $16.93 | $72,731 | 86,522 | −4.73% | plan? |
| Apr 21, 2017 FForm 4 → | Apr 25, 4:30 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 1,384 | $14.74 | $20,400 | 90,819 | — | plan? |
| Mar 26, 2017 FForm 4 → | Mar 28, 8:10 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 1,823 | $13.76 | $25,084 | 92,203 | — | plan? |
| Mar 16, 2017 AFForm 4 → | Mar 20, 9:00 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 37,411 | $13.75 | $50,930 | 94,026 | — | plan? |
| Aug 12, 2016 SForm 4 → | Aug 15, 7:47 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 1,027 | $18.19 | $18,681 | 63,625 | −1.59% | plan? |
| Jul 18, 2016 SForm 4 → | Jul 19, 4:30 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 2,297 | $17.76 | $40,795 | 64,652 | −3.43% | plan? |
| Jun 2, 2016 SForm 4 → | Jun 3, 4:30 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 2,297 | $16.00 | $36,752 | 66,949 | −3.32% | plan? |
| Apr 21, 2016 FForm 4 → | Apr 22, 7:07 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 1,383 | $13.05 | $18,048 | 69,246 | — | plan? |
| Mar 26, 2016 FForm 4 → | Mar 29, 7:28 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 1,823 | $11.96 | $21,803 | 70,629 | — | plan? |
| Mar 17, 2016 AForm 4 → | Mar 21, 8:07 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 39,717 | — | — | 72,452 | — | plan? |
| Apr 21, 2015 FForm 4 → | Apr 23, 9:01 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 1,384 | $15.21 | $21,051 | 32,735 | — | plan? |
| Mar 26, 2015 AForm 4 → | Mar 30, 6:03 am EDT | Amphastar Pharmaceuticals, Inc.AMPH | 19,397 | — | — | 34,119 | — | plan? |