Jack Y. Zhang
CEO & Chief Scientific Officer at Amphastar Pharmaceuticals Inc.
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 4 years
- Director since
- 2023
4 years of board service in total across 1 board, counting each seat separately. Longest: Amphastar Pharmaceuticals Inc., 3 years.
Amphastar Pharmaceuticals Inc.
Director · CEO & CHIEF SCIENTIFIC OFFICER
Chief executive roles
Amphastar Pharmaceuticals Inc.
· CEO & Chief Scientific Officer
Dates unknown
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Mar 15, 2026 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −9,784 | $18.18 | $177,873 |
| Mar 15, 2026 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −2,908 | $18.18 | $52,867 |
| Mar 10, 2026 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −14,785 | $18.91 | $279,584 |
| Mar 10, 2026 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −4,395 | $18.91 | $83,109 |
| Mar 9, 2026 | Amphastar Pharmaceuticals Inc. | Grant or award | +180,504 | — | — |
| Mar 9, 2026 | Amphastar Pharmaceuticals Inc. | Grant or award | +72,462 | — | — |
| Mar 4, 2026 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −5,769 | $19.96 | $115,149 |
| Mar 4, 2026 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −2,432 | $19.96 | $48,543 |
| Jun 13, 2025 | Amphastar Pharmaceuticals Inc. | Option exercise | +200,000 | $13.03 | $2,606,000 |
| Mar 17, 2025 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −16,150 | $27.69 | $447,194 |
| Mar 17, 2025 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −7,223 | $27.69 | $200,005 |
| Mar 15, 2025 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −9,765 | $26.66 | $260,335 |
| Mar 15, 2025 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −4,115 | $26.66 | $109,706 |
| Mar 14, 2025 | Amphastar Pharmaceuticals Inc. | Option exercise | +290,477 | $14.69 | $4,267,107 |
| Mar 14, 2025 | Amphastar Pharmaceuticals Inc. | Shares withheld for tax | −226,285 | $26.66 | $6,032,758 |
Reviews (0)
Sign in to write a review.
No reviews yet. Be the first to write one.