4
Changes in Ownership
Amphastar Pharmaceuticals, Inc. Filed Acc 0001415889-25-008523
CEO & CHIEF SCIENTIFIC OFFICER gave up 426,195 shares (to pay taxes)
- CEO & CHIEF SCIENTIFIC OFFICER acquired 501,690 shares (option exercise)
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 | 2025-03-14 | Option exercise | +290,477 | $14.69 | $4,267,107 | 2,899,859 | D |
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2025-03-14 | Shares withheld for taxes | −226,285 | $26.66 | $6,032,758 | 2,673,574 | D |
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2025-03-15 | Shares withheld for taxes | −9,765 | $26.66 | $260,335 | 2,663,809 | D |
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2025-03-17 | Shares withheld for taxes | −16,150 | $27.69 | $447,194 | 2,647,659 | D |
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2025-03-14 | Option exercise | +211,213 | $14.69 | $3,102,719 | 1,359,470 | I |
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2025-03-14 | Shares withheld for taxes | −162,657 | $26.66 | $4,336,436 | 1,196,813 | I |
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2025-03-15 | Shares withheld for taxes | −4,115 | $26.66 | $109,706 | 1,192,698 | I |
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2025-03-17 | Shares withheld for taxes | −7,223 | $27.69 | $200,005 | 1,185,475 | I |
| Derivatives | |||||||
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2025-03-14 | Option exercise · Employee Stock Option (right to buy) | −290,477 | 0 | D | ||
| Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | 2025-03-14 | Option exercise · Employee Stock Option (right to buy) | −211,213 | 0 | I | ||
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