Mary Z. Luo is CEO & Chairman +2 at Amphastar Pharmaceuticals, Inc. (AMPH). They have made 4 open-market trades across 1 company since 2015, most recently 2026-03-06.
CIK 0001611156
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 4 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| AMPH | 2,834,117 | $73.2M |
Shares reported on the most recent Form 4, priced at the 2026-03-10 close.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| AMPH | SELL · 10b5-1 | 2024-01-08 | 2024-01-10 | $58.23 | $25.6M | +1.6% | +1.8% | -25.1% |
| AMPH | SELL | 2022-05-18 | 2022-05-20 | $34.00 | $7.4M | +11.9% | -7.6% | -5.2% |
| AMPH | SELL | 2022-05-16 | 2022-05-18 | $35.75 | $8.5M | +10.0% | -6.7% | -3.7% |
| AMPH | SELL | 2019-09-11 | 2019-09-12 | $20.82 | $6.2M | -6.9% | -7.2% | -10.8% |
| AMPH | SELL | 2018-12-11 | 2018-12-13 | $21.29 | $5.7M | -4.1% | +3.1% | +0.0% |
| AMPH | SELL · 10b5-1 | 2015-12-09 | 2015-12-11 | $14.24 | $902K | -12.7% | -12.6% | -20.8% |
| AMPH | SELL · 10b5-1 | 2015-06-05 | 2015-06-09 | $16.43 | $3.2M | -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.