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.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
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Amphastar Pharmaceuticals Inc. June 2, 202594.2%
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 |
Questions about Jack Y. Zhang
What boards is Jack Y. Zhang on?
Jack Y. Zhang sits on the board of Amphastar Pharmaceuticals Inc.
What company is Jack Y. Zhang the CEO of?
Jack Y. Zhang is CEO & Chief Scientific Officer of Amphastar Pharmaceuticals Inc.
How long has Jack Y. Zhang served on boards?
Our records show at least 4 years of board service across 1 board, the earliest from 2023.
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