Rong Zhou serves as Executive at Amphastar Pharmaceuticals, Inc., where they oversee executive responsibilities. Since joining the company, Rong Zhou has executed 97 insider transactions totaling $5.3M, demonstrating a bearish approach to their equity position. Their most recent transaction on Dec 17, 2025 involved selling 9,787 shares valued at $256.4K.
Rong Zhou currently holds 138,043 shares of Amphastar Pharmaceuticals, Inc. (AMPH), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Rong Zhou has been a net seller of AMPH stock. They have purchased $0 and sold $5.3M worth of shares.
Rong Zhou's most recent insider trade was on Dec 17, 2025, when they sold 9,787 shares at $26.20 per share.
Get notified when new Form 4 filings are submitted
| $11.33 |
| Discretionary |
| Sep 13, 2024 | AMPH | $144.8K | Sale | 3,000 | $48.26 | Discretionary |
| Sep 13, 2024 | AMPH | $44.9K | Option Exercise | 3,000 | $14.95 | Discretionary |
| Aug 26, 2024 | AMPH | $193.4K | Sale | 4,000 | $48.35 | Discretionary |
| Aug 26, 2024 | AMPH | $59.8K | Option Exercise | 4,000 | $14.95 | Discretionary |
| Mar 17, 2024 | AMPH | $84.4K | Payment | 1,961 | $43.05 | Discretionary |
| Mar 16, 2024 | AMPH | $101.4K | Payment | 2,355 | $43.05 | Discretionary |
| Mar 15, 2024 | AMPH | $52.5K | Payment | 1,219 | $43.05 | Discretionary |
| Mar 6, 2024 | AMPH | $64.4K | Payment | 1,390 | $46.31 | Discretionary |
| Mar 4, 2024 | AMPH | $0 | Award | 12,521 | $N/A | Discretionary |
| Dec 4, 2023 | AMPH | $56.9K | Option Exercise | 3,514 | $16.19 | Discretionary |
| Dec 4, 2023 | AMPH | $209.4K | Sale | 3,514 | $59.58 | Discretionary |
| Dec 1, 2023 | AMPH | $252.8K | Sale | 4,316 | $58.58 | Discretionary |
| Dec 1, 2023 | AMPH | $62.2K | Option Exercise | 4,316 | $14.40 | Discretionary |
| Jun 20, 2023 | AMPH | $109.3K | Option Exercise | 9,651 | $11.33 | Discretionary |
| Jun 15, 2023 | AMPH | $69.2K | Option Exercise | 4,631 | $14.95 | Discretionary |
| Jun 15, 2023 | AMPH | $258.9K | Sale | 5,000 | $51.79 | Discretionary |
| Jun 15, 2023 | AMPH | $195.5K | Option Exercise | 13,575 | $14.40 | Discretionary |
| Jun 15, 2023 | AMPH | $19.0K | Option Exercise | 1,171 | $16.19 | Discretionary |
| Jun 13, 2023 | AMPH | $72.0K | Option Exercise | 5,000 | $14.40 | Discretionary |
| Jun 13, 2023 | AMPH | $241.2K | Sale | 5,000 | $48.24 | Discretionary |
| May 18, 2023 | AMPH | $442.1K | Sale | 10,000 | $44.21 | Discretionary |
| May 18, 2023 | AMPH | $144.0K | Option Exercise | 10,000 | $14.40 | Discretionary |
| Mar 17, 2023 | AMPH | $69.0K | Payment | 1,901 | $36.29 | Discretionary |
| Mar 16, 2023 | AMPH | $85.8K | Payment | 2,283 | $37.60 | Discretionary |
| Mar 15, 2023 | AMPH | $75.8K | Payment | 2,057 | $36.84 | Discretionary |
| Mar 6, 2023 | AMPH | $0 | Award | 15,129 | $N/A | Discretionary |
| Mar 17, 2022 | AMPH | $83.6K | Payment | 2,447 | $34.18 | Discretionary |
| Mar 16, 2022 | AMPH | $78.1K | Payment | 2,283 | $34.22 | Discretionary |