Amphastar Pharmaceuticals, Inc. (AMPH) has 325 open-market insider trades by 31 insiders since 2005. Over the last six months insiders net sold $477K. The most active filer is Richard K. Prins, Director.
| Name | Title | Tier | Trades | Value | Last Trade |
|---|---|---|---|---|---|
| Mary Z. Luo | CEOChairmanCOOCSO | — | 4 | $19.9M | 2026-03-06 |
| Jack Y. Zhang | CEOCSO10% Owner | — | 10 | $19.1M | 2026-03-15 |
| William J. Peters | CFOVPTreasurer | — | 37 | $13.6M | 2026-08-07 |
| Richard K. Prins | Dir | — | 42 | $11.4M | 2026-08-11 |
| Michael A. Zasloff | Dir | — | 16 | $11.2M | 2026-06-01 |
| Jason B. Shandell | PresCLO | — | 29 | $10.3M | 2020-03-17 |
| Howard Lee | Dir | — | 17 | $9.4M | 2026-06-02 |
| Rong Zhou | VP | — | 27 | $8.7M | 2026-09-16 |
| Yakob Liawatidewi | VP | — | 21 | $7.3M | 2026-03-15 |
| Floyd F. Petersen | Dir | — | 14 | $5.9M | 2025-12-12 |
| Insider | Title | Type | Value | Date |
|---|---|---|---|---|
| Stephen B. Shohet | CFO & VP +1 | Sell | $103K | 2026-09-21 |
| Rong Zhou | VP | Sell | $239K | 2026-09-16 |
| Stephen B. Shohet | VP | Sell | $75K | 2026-09-02 |
| Richard K. Prins | Director | Sell | $162K | 2026-08-11 |
| William J. Peters | CFO & VP +1 | Sell | $184K | 2026-08-07 |
| Rong Zhou | VP | Sell | $513K | 2025-12-17 |
Companies that share insiders with AMPH, and sector peers with recent insider buying. Related by who files, not by how the stocks move.
| Floyd F. Petersen | Director | Sell | $170K | 2025-12-11 |
| Richard K. Prins | Director | Sell | $227K | 2025-11-25 |
| Floyd F. Petersen | Director | Sell | $884K | 2025-11-13 |
| Floyd F. Petersen | Director | Sell | $13K | 2025-11-03 |
| Floyd F. Petersen | Director | Sell | $14K | 2025-10-01 |
| Floyd F. Petersen | Director | Sell | $15K | 2025-09-02 |
| Floyd F. Petersen | Director | Sell | $10K | 2025-08-01 |
| Floyd F. Petersen | Director | Sell | $12K | 2025-07-02 |
| Floyd F. Petersen | Director | Sell | $13K | 2025-06-02 |