13 insiders reported 77 Form 4 transactions for Amphastar Pharmaceuticals, Inc. (AMPH) over the past 18 months (most recent 2026-09-23). Recent activity: PETERS WILLIAM J (CFO, EVP & TREASURER) Sell 4,139 shares, Zhou Rong (SENIOR EVP, PRODUCTION CENTER) Buy 10,000 shares, Zhou Rong (SENIOR EVP, PRODUCTION CENTER) Sell 10,000 shares, Zhou Rong (SENIOR EVP, PRODUCTION CENTER) Sell 3,187 shares, PRINS RICHARD K (Director) Sell 7,973 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-23 | PETERS WILLIAM J | CFO, EVP & TREASURER | Sell | 4,139 | $103,475 |
| 2026-09-17 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Buy | 10,000 | $133,500 |
| 2026-09-17 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Sell | 10,000 | $239,404 |
| 2026-09-03 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Sell | 3,187 | $75,306 |
| 2026-08-12 | PRINS RICHARD K | Director | Sell | 7,973 | $161,852 |
| 2026-08-11 | PETERS WILLIAM J | CFO, EVP & TREASURER | Buy | 5,053 | $99,999 |
| 2026-08-11 | PETERS WILLIAM J | CFO, EVP & TREASURER | Sell | 8,180 | $183,886 |
| 2026-07-13 | Pierce Anthony T | Director | Buy | 7,886 | $0 |
| 2026-06-03 | PRINS RICHARD K | Director | Buy | 8,143 | $0 |
| 2026-06-03 | Lee Howard | Director | Buy | 8,143 | $0 |
| 2026-06-03 | Lee Howard | Director | Sell | 769 | $14,188 |
| 2026-06-03 | PRINS RICHARD K | Director | Sell | 1,500 | $0 |
| 2026-06-03 | ZASLOFF MICHAEL A | Director | Buy | 8,143 | $0 |
| 2026-06-03 | Deflin Gayle | Director | Buy | 8,143 | $0 |
| 2026-06-03 | Gerst Diane G. | Director | Buy | 8,143 | $0 |
| 2026-06-03 | Gaugh David Russell | Director | Buy | 8,143 | $0 |
| 2026-03-17 | Luo Mary Z. | COO, Chief Scientist, Chairman | Sell | 9,784 | $177,873 |
| 2026-03-17 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER | Sell | 9,784 | $177,873 |
| 2026-03-17 | Luo Mary Z. | COO, Chief Scientist, Chairman | Sell | 2,908 | $52,867 |
| 2026-03-17 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER | Sell | 2,908 | $52,867 |
| 2026-03-17 | Liawatidewi Yakob | EVP CORP ADMIN CENTER | Sell | 1,033 | $18,780 |
| 2026-03-17 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Sell | 1,225 | $22,270 |
| 2026-03-17 | PETERS WILLIAM J | CFO, EVP & TREASURER | Sell | 1,973 | $35,869 |
| 2026-03-11 | Luo Mary Z. | COO, Chief Scientist, Chairman | Buy | 180,504 | $0 |
| 2026-03-11 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER | Buy | 180,504 | $0 |
Source: SEC Form 4 filings · as of 2026-09-23