William J. Peters is CFO & VP +1 at Amphastar Pharmaceuticals, Inc. (AMPH). They have made 46 open-market trades across 2 companies since 2006, most recently 2026-08-07.
CIK 0001263136
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.
0 open-market purchases, against 46 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| AMPH | SELL · 10b5-1 | 2026-08-07 | 2026-08-11 | $22.48 | $184K | +9.9% | +19.7% | — |
| AMPH | SELL · 10b5-1 | 2025-03-04 | 2025-03-06 | $27.54 | $233K | -2.8% | -11.2% | -8.1% |
| AMPH | SELL · 10b5-1 | 2024-11-06 | 2024-11-08 | $52.05 | $773K | -9.1% | -9.7% | -32.4% |
| AMPH | SELL · 10b5-1 | 2024-07-31 | 2024-08-02 | $44.23 | $910K | +5.7% | +17.0% | +25.9% |
| AMPH | SELL · 10b5-1 | 2024-06-27 | 2024-06-28 | $40.89 | $268K | +0.9% | +8.4% | +23.3% |
| AMPH | SELL · 10b5-1 | 2024-03-06 | 2024-03-08 | $46.48 | $1.7M | -3.1% | -9.7% | -9.9% |
| AMPH | SELL · 10b5-1 | 2023-11-14 | 2023-11-16 | $55.67 | $6.6M | -0.6% | +3.5% | -2.1% |
| AMPH | SELL · 10b5-1 | 2023-09-06 | 2023-09-08 | $51.75 | $3.1M | -8.0% | -5.3% | +13.7% |
| AMPH | SELL · 10b5-1 | 2023-06-15 | 2023-06-20 | $50.35 | $2.5M | +3.0% | +13.4% | -17.1% |
| AMPH | SELL · 10b5-1 | 2023-06-02 | 2023-06-05 | $46.35 | $510K | +13.1% | +24.9% | +11.5% |
| AMPH | SELL · 10b5-1 | 2023-05-18 | 2023-05-22 | $44.35 | $466K | +5.3% | +27.0% | +20.5% |
| AMPH | SELL · 10b5-1 | 2023-04-17 | 2023-04-18 | $42.35 | $477K | -16.4% | +2.5% | +32.5% |
| AMPH | SELL · 10b5-1 | 2023-04-13 | 2023-04-14 | $42.35 | $412K | -9.7% | -1.2% | +30.7% |
| AMPH | SELL | 2023-04-10 | 2023-04-12 | $40.35 | $810K | +3.6% | +5.4% | +39.4% |
| AMPH | SELL | 2023-03-15 | 2023-03-17 | $36.43 | $931K | +2.4% | +14.5% | +42.5% |
| AMPH | SELL | 2023-03-01 | 2023-03-03 | $36.33 | $797K | +2.0% | +5.6% | +25.0% |
| AMPH | SELL | 2022-08-09 | 2022-08-10 | $38.35 | $384K | +3.2% | -12.0% | -14.8% |
| AMPH | SELL | 2022-06-30 | 2022-07-01 | $34.95 | $1.3M | +2.1% | +6.2% | -16.7% |
| AMPH | SELL | 2022-06-17 | 2022-06-22 | $32.05 | $353K | +9.3% | +13.4% | -10.9% |
| AMPH | SELL | 2022-03-16 | 2022-03-18 | $33.96 | $3.4M | +5.4% | +11.2% | -10.0% |
| AMPH | SELL | 2022-03-15 | 2022-03-17 | $34.46 | $272K | +2.8% | +10.2% | -10.2% |
| AMPH | SELL | 2022-03-07 | 2022-03-09 | $29.35 | $765K | +17.8% | +36.7% | +37.6% |
| AMPH | SELL | 2022-02-25 | 2022-03-01 | $28.47 | $655K | +24.7% | +30.5% | +35.1% |
| AMPH | SELL | 2022-02-08 | 2022-02-09 | $26.95 | $270K | +0.8% | +32.4% | +31.3% |
| AMPH | SELL | 2022-01-07 | 2022-01-11 | $24.78 | $1.5M | -2.1% | +4.3% | +63.4% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.