| Jun 1, 2026 AForm 4 → | Jun 3, 8:33 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 8,143 | — | — | 31,899 | — | |
| Dec 19, 2017 SForm 4 → | Dec 19, 6:28 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 523 | $19.48 | $10,186 | 30,164 | −1.70% | plan? |
| Dec 12, 2017 SForm 4 → | Dec 14, 8:02 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 523 | $18.96 | $9,917 | 30,687 | −1.68% | plan? |
| Nov 28, 2017 SForm 4 → | Nov 30, 7:37 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 523 | $18.15 | $9,493 | 31,210 | −1.65% | plan? |
| Nov 21, 2017 SForm 4 → | Nov 21, 5:21 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 523 | $18.81 | $9,839 | 31,733 | −1.62% | plan? |
| Nov 15, 2017 SForm 4 → | Nov 17, 8:01 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 523 | $17.77 | $9,292 | 32,256 | −1.60% | plan? |
| Nov 7, 2017 SForm 4 → | Nov 9, 9:00 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 523 | $17.93 | $9,375 | 32,779 | −1.57% | plan? |
| Oct 24, 2017 SForm 4 → | Oct 26, 6:20 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 523 | $18.29 | $9,568 | 33,302 | −1.55% | plan? |
| Oct 17, 2017 SForm 4 → | Oct 19, 8:00 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 523 | $18.48 | $9,665 | 33,825 | −1.52% | plan? |
| Oct 5, 2017 SForm 4 → | Oct 6, 5:54 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 8,444 | $18.87 | $159,376 | 34,348 | −19.7% | plan? |
| Oct 5, 2017 MForm 4 → | Oct 6, 5:54 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 8,444 | $11.33 | $95,671 | 42,792 | — | plan? |
| Jun 15, 2017 FForm 4 → | Jun 16, 7:13 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 146 | $16.18 | $2,362 | 34,348 | — | plan? |
| Apr 14, 2017 FForm 4 → | Apr 17, 7:06 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 754 | $14.80 | $11,159 | 34,494 | — | plan? |
| Mar 26, 2017 FForm 4 → | Mar 28, 8:13 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 614 | $13.76 | $8,449 | 35,248 | — | plan? |
| Mar 16, 2017 AFForm 4 → | Mar 20, 9:03 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 12,055 | $13.75 | $16,418 | 35,862 | — | plan? |
| Dec 15, 2016 SForm 4 → | Dec 16, 7:01 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 2,940 | $20.51 | $60,287 | 26,195 | −10.1% | plan? |
| Aug 19, 2016 SForm 4 → | Aug 19, 7:26 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 24,046 | $19.28 | $463,607 | 28,985 | −45.3% | plan? |
| Aug 19, 2016 MForm 4 → | Aug 19, 7:26 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 24,046 | $12.31 | $295,975 | 53,031 | — | plan? |
| Jun 15, 2016 FForm 4 → | Jun 17, 6:40 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 146 | $15.76 | $2,301 | 28,985 | — | plan? |
| May 18, 2016 SForm 4 → | May 19, 5:45 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 1,427 | $13.97 | $19,939 | 28,649 | −4.74% | plan? |
| Apr 18, 2016 SForm 4 → | Apr 20, 4:52 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 21,244 | $12.89 | $273,774 | 30,076 | −41.4% | plan? |
| Apr 18, 2016 MForm 4 → | Apr 20, 4:52 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 19,817 | $10.76 | $213,262 | 35,683 | — | plan? |
| Apr 14, 2016 FForm 4 → | Apr 18, 4:30 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 741 | $12.66 | $9,381 | 31,503 | — | plan? |
| Mar 26, 2016 FForm 4 → | Mar 29, 7:31 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 614 | $11.96 | $7,343 | 32,244 | — | plan? |
| Mar 17, 2016 AForm 4 → | Mar 21, 8:12 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 11,253 | — | — | 32,858 | — | plan? |
| Apr 14, 2015 AFForm 4 → | Jun 17, 6:08 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 2,406 | $15.22 | $13,120 | 20,178 | — | plan? late |
| Apr 8, 2015 SForm 4 → | Apr 10, 7:31 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 10,000 | $15.79 | $157,900 | 19,496 | −33.9% | plan? |
| Apr 8, 2015 MForm 4 → | Apr 10, 7:31 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 10,000 | $14.80 | $148,000 | 29,496 | — | plan? |
| Mar 26, 2015 AForm 4 → | Mar 30, 6:06 am EDT | Amphastar Pharmaceuticals, Inc.AMPH | 6,688 | — | — | 19,496 | — | plan? |