Jack Y. Zhang is CEO & Chairman +2 at Amphastar Pharmaceuticals, Inc. (AMPH). They have made 10 open-market trades across 1 company since 2015, most recently 2026-03-15.
CIK 0001611157
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 $1.3M since 2018, against 9 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| AMPH | 1,245,125 | $32.2M |
Shares reported on the most recent Form 4, priced at the 2026-03-17 close.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 67% | 33% | 33% |
| Avg Move | -3.0% | +0.3% | +1.4% |
| Scored | 6 | 6 | 6 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| AMPH | SELL · 10b5-1 | 2024-01-10 | 2024-01-11 | $54.56 | $14.2M | +1.7% | +3.2% | -26.2% |
| AMPH | SELL | 2022-05-20 | 2022-05-23 | $34.21 | $729K | +10.2% | -7.5% | -3.6% |
| AMPH | SELL | 2021-02-16 | 2021-02-18 | $18.58 | $1.1M | -5.1% | +1.0% | +8.2% |
| AMPH | SELL | 2021-02-10 | 2021-02-12 | $18.93 | $1.8M | -5.1% | +1.5% | +3.7% |
| AMPH | SELL | 2021-02-05 | 2021-02-09 | $18.92 | $1.5M | -4.2% | +0.7% | +1.3% |
| AMPH | SELL | 2021-02-03 | 2021-02-05 | $18.68 | $1.6M | -3.8% | -5.9% | -5.4% |
| AMPH | SELL | 2021-02-01 | 2021-02-03 | $18.42 | $1.4M | +0.2% | -4.7% | -1.4% |
| AMPH | SELL | 2018-12-14 | 2018-12-17 | $20.48 | $1.8M | +0.2% | +8.9% | +1.8% |
| AMPH | BUY | 2018-05-15 | 2018-05-17 | $16.07 | $1.3M | -4.4% | +1.2% | +5.2% |
| AMPH | SELL | 2016-09-20 | 2016-09-22 | $21.03 | $18.7M | -0.5% | -6.3% | +2.4% |
| AMPH | SELL · 10b5-1 | 2015-12-04 | 2015-12-08 | $14.71 | $1.0M | -12.7% | -6.0% | -17.6% |
| AMPH | SELL · 10b5-1 | 2015-12-01 | 2015-12-03 | $15.46 | $596K | -12.7% | -2.5% | -18.9% |
| AMPH | SELL · 10b5-1 | 2015-06-15 | 2015-06-17 | $16.29 | $739K | -12.7% | -2.5% | -2.5% |
| AMPH | SELL | 2015-06-10 | 2016-02-03 | $16.23 | $2.6M | -2.7% | -1.4% | +7.3% |
| AMPH | SELL · 10b5-1 | 2015-06-10 | 2015-06-12 | $16.22 | $2.4M | -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.