4
Changes in Ownership
Amphastar Pharmaceuticals, Inc. Filed Acc 0000889740-26-000005
CEO & CHIEF SCIENTIFIC OFFICER gave up 19,180 shares (to pay taxes)
- CEO & CHIEF SCIENTIFIC OFFICER acquired 252,966 shares (grant or award)
From the SEC's structured data for this filing
Trades in this filing
| Insider | Date | Transaction | Shares | Price | Value | Owned after | D/I |
|---|---|---|---|---|---|---|---|
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2026-03-09 | Grant or award | +180,504 | 3,014,621 | D | ||
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2026-03-10 | Shares withheld for taxes | −14,785 | $18.91 | $279,584 | 2,999,836 | D |
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2026-03-09 | Grant or award | +72,462 | 1,252,428 | I | ||
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2026-03-10 | Shares withheld for taxes | −4,395 | $18.91 | $83,109 | 1,248,033 | I |
| Derivatives | |||||||
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2026-03-09 | Grant or award · Employee Stock Option (right to buy) | +372,338 | 372,338 | D | ||
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2026-03-09 | Grant or award · Employee Stock Option (right to buy) | +149,472 | 149,472 | I | ||
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