Michael A. Zasloff is Director at Amphastar Pharmaceuticals, Inc. (AMPH). They have made 16 open-market trades across 1 company since 2014, most recently 2026-06-01.
CIK 0001033511
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
1 open-market purchase totalling $35K since 2014, against 15 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| AMPH | 37,667 | $973K |
Shares reported on the most recent Form 4, priced at the 2026-06-03 close.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| AMPH | SELL | 2024-03-05 | 2024-03-06 | $47.18 | $1.2M | -4.9% | -7.3% | -6.3% |
| AMPH | SELL | 2023-08-15 | 2023-08-16 | $57.22 | $1.5M | -4.8% | -17.7% | +1.2% |
| AMPH | SELL | 2023-05-15 | 2023-05-16 | $42.18 | $316K | +2.4% | +21.2% | +25.5% |
| AMPH | SELL | 2022-05-16 | 2022-05-17 | $35.61 | $733K | +8.8% | -13.0% | -9.0% |
| AMPH | SELL | 2022-03-16 | 2022-03-17 | $33.71 | $337K | +2.8% | +10.2% | -10.2% |
| AMPH | SELL | 2021-05-13 | 2021-05-14 | $19.34 | $999K | -3.0% | -1.3% | -2.0% |
| AMPH | SELL | 2020-05-14 | 2020-05-18 | $18.02 | $1.1M | -1.2% | +6.2% | +8.6% |
| AMPH | SELL | 2020-05-12 | 2020-05-14 | $19.00 | $190K | +4.7% | +11.1% | +13.0% |
| AMPH | SELL | 2018-11-14 | 2018-11-15 | $20.39 | $1.2M | -1.1% | -3.5% | +14.8% |
| AMPH | SELL | 2018-06-12 | 2018-06-13 | $16.52 | $248K | -7.4% | -1.6% | +13.5% |
| AMPH | SELL | 2017-10-02 | 2017-10-03 | $18.18 | $2.3M | +0.4% | -0.4% | +3.1% |
| AMPH | SELL | 2017-06-01 | 2017-06-01 | $17.01 | $510K | -4.1% | +4.2% | -10.0% |
| AMPH | SELL | 2016-08-15 | 2016-08-16 | $18.22 | $317K | +6.0% | +1.8% | +11.9% |
| AMPH | SELL | 2016-08-12 | 2016-08-16 | $18.15 | $878K | +6.0% | +1.8% | +11.9% |
| AMPH | SELL | 2016-08-12 | 2016-08-16 | $18.12 | $561K | +6.0% | +1.8% | +11.9% |
| AMPH | SELL · 10b5-1 | 2015-12-16 | 2015-12-17 | $14.19 | $437K | -12.7% | -14.4% | -13.6% |
| AMPH | SELL · 10b5-1 | 2015-07-17 | 2015-07-21 | $17.41 | $134K | -12.7% | -2.5% | -2.5% |
| AMPH | BUY | 2014-08-19 | 2014-08-20 | $10.00 | $35K | -12.7% | -2.5% | -2.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.