Jack Y. Zhang serves as Executive at Amphastar Pharmaceuticals, Inc., where they oversee executive responsibilities. Since joining the company, Jack Y. Zhang has executed 128 insider transactions totaling $29.7M, demonstrating a bearish approach to their equity position. Their most recent transaction on Jun 12, 2015 involved selling 38,471 shares valued at $622.1K.
Jack Y. Zhang currently holds 2,633,554 shares of Amphastar Pharmaceuticals, Inc. (AMPH), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Jack Y. Zhang has been a net seller of AMPH stock. They have purchased $642.9K and sold $29.1M worth of shares.
Jack Y. Zhang's most recent insider trade was on Jun 12, 2015, when they sold 38,471 shares at $16.17 per share.
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| $12.97 |
| Discretionary |
| Jun 11, 2015 | AMPH | $192.1K | Sale | 11,664 | $16.47 | Discretionary |
| Jun 11, 2015 | AMPH | $167.7K | Option Exercise | 12,930 | $12.97 | Discretionary |
| Jun 11, 2015 | AMPH | $191.1K | Sale | 11,600 | $16.47 | Discretionary |
| Jun 11, 2015 | AMPH | $166.8K | Option Exercise | 12,860 | $12.97 | Discretionary |
| Jun 11, 2015 | AMPH | $166.8K | Option Exercise | 12,860 | $12.97 | Discretionary |
| Jun 11, 2015 | AMPH | $191.1K | Sale | 11,600 | $16.47 | Discretionary |
| Jun 11, 2015 | AMPH | $20.9K | Payment | 1,266 | $16.47 | Discretionary |
| Jun 11, 2015 | AMPH | $192.1K | Sale | 11,664 | $16.47 | Discretionary |
| Jun 11, 2015 | AMPH | $20.8K | Payment | 1,260 | $16.47 | Discretionary |
| Jun 11, 2015 | AMPH | $167.7K | Option Exercise | 12,930 | $12.97 | Discretionary |
| Jun 10, 2015 | AMPH | $186.8K | Sale | 11,411 | $16.37 | Discretionary |
| Jun 10, 2015 | AMPH | $163.7K | Option Exercise | 12,619 | $12.97 | Discretionary |
| Jun 10, 2015 | AMPH | $192.2K | Sale | 11,731 | $16.38 | Discretionary |
| Jun 10, 2015 | AMPH | $168.3K | Option Exercise | 12,975 | $12.97 | Discretionary |
| Jun 10, 2015 | AMPH | $163.7K | Option Exercise | 12,619 | $12.97 | Discretionary |
| Jun 10, 2015 | AMPH | $20.4K | Payment | 1,244 | $16.38 | Discretionary |
| Jun 10, 2015 | AMPH | $192.2K | Sale | 11,731 | $16.38 | Discretionary |
| Jun 10, 2015 | AMPH | $168.3K | Option Exercise | 12,975 | $12.97 | Discretionary |
| Jun 10, 2015 | AMPH | $186.8K | Sale | 11,411 | $16.37 | Discretionary |
| Jun 10, 2015 | AMPH | $19.8K | Payment | 1,208 | $16.37 | Discretionary |
| Jun 9, 2015 | AMPH | $42.7K | Payment | 2,633 | $16.23 | Discretionary |
| Jun 9, 2015 | AMPH | $42.6K | Payment | 2,624 | $16.24 | Discretionary |
| Jun 8, 2015 | AMPH | $50.7K | Payment | 3,052 | $16.61 | Discretionary |
| Jun 8, 2015 | AMPH | $50.6K | Payment | 3,046 | $16.61 | Discretionary |
| Jun 5, 2015 | AMPH | $101.7K | Payment | 6,173 | $16.47 | Discretionary |
| Jun 5, 2015 | AMPH | $79.5K | Payment | 4,831 | $16.46 | Discretionary |