| Sep 16, 2026 SForm 4 → | Sep 17, 6:19 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 10,000 | $23.94 | $239,404 | 169,203 | −5.58% | |
| Sep 16, 2026 MForm 4 → | Sep 17, 6:19 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 10,000 | $13.35 | $133,500 | 179,203 | — | |
| Sep 2, 2026 SForm 4 → | Sep 3, 7:42 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 3,187 | $23.63 | $75,306 | 169,203 | −1.85% | |
| Mar 1, 2019 SForm 4 → | Mar 4, 8:44 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 3,200 | $25.00 | $80,000 | 52,030 | −5.79% | plan? |
| Mar 1, 2019 MForm 4 → | Mar 4, 8:44 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 3,200 | $20.26 | $64,832 | 55,230 | — | plan? |
| Feb 5, 2019 SForm 4 → | Feb 7, 4:05 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 4,289 | $23.00 | $98,647 | 52,030 | −7.62% | plan? amended |
| Feb 5, 2019 MForm 4 → | Feb 7, 4:05 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 3,200 | $20.26 | $64,832 | 56,319 | — | plan? amended |
| Dec 3, 2018 SForm 4 → | Dec 6, 3:56 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 1,089 | $22.00 | $23,958 | 53,119 | −2.01% | plan? |
| Nov 8, 2018 SForm 4 → | Nov 13, 5:10 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 2,173 | $20.50 | $44,549 | 53,303 | −3.92% | plan? late |
| Jun 15, 2018 FForm 4 → | Jun 18, 4:59 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 134 | $16.88 | $2,262 | 55,476 | — | plan? |
| Mar 26, 2018 FForm 4 → | Mar 28, 5:23 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 535 | $18.61 | $9,956 | 54,434 | — | plan? |
| Mar 16, 2018 FForm 4 → | Mar 20, 8:06 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 2,097 | $19.91 | $41,751 | 54,969 | — | plan? |
| Mar 15, 2018 AForm 4 → | Mar 16, 6:16 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 8,969 | — | — | 57,066 | — | plan? |
| Jun 15, 2017 FForm 4 → | Jun 16, 7:14 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 146 | $16.18 | $2,362 | 48,096 | — | plan? |
| Mar 26, 2017 FForm 4 → | Mar 28, 8:15 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 568 | $13.76 | $7,816 | 46,972 | — | plan? |
| Mar 16, 2017 AFForm 4 → | Mar 20, 9:04 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 13,045 | $13.75 | $17,160 | 47,540 | — | plan? |
| Dec 5, 2016 SForm 4 → | Dec 7, 7:00 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 61 | $20.70 | $1,262 | 36,991 | −0.16% | plan? |
| Jun 15, 2016 FForm 4 → | Jun 17, 6:41 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 146 | $15.76 | $2,301 | 36,991 | — | plan? |
| Jun 15, 2016 SForm 4 → | Jun 17, 6:41 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 1,551 | $15.85 | $24,584 | 37,137 | −4.01% | plan? |
| Mar 26, 2016 FForm 4 → | Mar 29, 7:36 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 568 | $11.96 | $6,793 | 37,137 | — | plan? |
| Mar 17, 2016 AForm 4 → | Mar 21, 8:09 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 11,473 | — | — | 37,705 | — | plan? |
| Dec 16, 2015 SForm 4 → | Dec 17, 7:30 pm EST | Amphastar Pharmaceuticals, Inc.AMPH | 772 | $14.29 | $11,032 | 25,460 | −2.94% | plan? |
| Jun 17, 2015 SForm 4 → | Jun 19, 4:30 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 1,000 | $16.48 | $16,480 | 26,232 | −3.67% | plan? |
| Jun 15, 2015 AForm 4 → | Jun 17, 6:06 pm EDT | Amphastar Pharmaceuticals, Inc.AMPH | 1,544 | — | — | 27,232 | — | plan? |