Jack Yongfeng Zhang's most recent trade in Amphastar Pharmaceuticals Inc was a trade of 200,000 Employee Stock Option (right to buy) done . Disclosure was reported to the exchange on June 13, 2025.
| Stock | Client Name | Client Category | Action | Reported to Exchange | Quantity | Post Transaction Holding | Traded % | Avg. Price | Value | Security Type |
|---|---|---|---|---|---|---|---|---|---|---|
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 0.00 per share. | 13 Jun 2025 | 200,000 | 205,003 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 13.03 per share. | 13 Jun 2025 | 200,000 | 2,847,659 (6%) | 0% | 13.0 | 2,606,000 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 14.69 per share. | 14 Mar 2025 | 290,477 | 2,899,859 (6%) | 0% | 14.7 | 4,267,107 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 0.00 per share. | 14 Mar 2025 | 290,477 | 0 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 26.66 per share. | 14 Mar 2025 | 226,285 | 2,673,574 (5%) | 0% | 26.7 | 6,032,758 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 14.69 per share. | 14 Mar 2025 | 211,213 | 1,359,470 (2%) | 0% | 14.7 | 3,102,719 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 0.00 per share. | 14 Mar 2025 | 211,213 | 0 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 26.66 per share. | 14 Mar 2025 | 162,657 | 1,196,813 (2%) | 0% | 26.7 | 4,336,436 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 27.69 per share. | 14 Mar 2025 | 16,150 | 2,647,659 (5%) | 0% | 27.7 | 447,194 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 26.66 per share. | 14 Mar 2025 | 9,765 | 2,663,809 (5%) | 0% | 26.7 | 260,335 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 27.69 per share. | 14 Mar 2025 | 7,223 | 1,185,475 (2%) | 0% | 27.7 | 200,005 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 26.66 per share. | 14 Mar 2025 | 4,115 | 1,192,698 (2%) | 0% | 26.7 | 109,706 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 10 Mar 2025 | 246,821 | 246,821 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 10 Mar 2025 | 116,226 | 2,609,382 (5%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 10 Mar 2025 | 104,052 | 104,052 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 10 Mar 2025 | 48,996 | 1,148,257 (2%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 28.32 per share. | 06 Mar 2025 | 9,645 | 2,493,156 (5%) | 0% | 28.3 | 273,146 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 28.32 per share. | 06 Mar 2025 | 3,069 | 1,099,261 (2%) | 0% | 28.3 | 86,914 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 27.62 per share. | 04 Mar 2025 | 5,753 | 2,502,801 (5%) | 0% | 27.6 | 158,898 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 27.62 per share. | 04 Mar 2025 | 2,426 | 1,102,330 (2%) | 0% | 27.6 | 67,006 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Gift of securities by or to the insider at price $ 0.00 per share. | 11 Nov 2024 | 125,000 | 2,508,554 (5%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Gift of securities by or to the insider at price $ 0.00 per share. | 11 Nov 2024 | 125,000 | 1,104,756 (2%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 14.69 per share. | 13 Sep 2024 | 100,000 | 2,633,554 (5%) | 0% | 14.7 | 1,469,000 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 0.00 per share. | 13 Sep 2024 | 100,000 | 290,477 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 0.00 per share. | 10 Jun 2024 | 100,000 | 390,477 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 14.69 per share. | 10 Jun 2024 | 100,000 | 2,533,554 (5%) | 0% | 14.7 | 1,469,000 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 12.46 per share. | 15 Mar 2024 | 722,046 | 2,858,043 (6%) | 1% | 12.5 | 8,996,693 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 0.00 per share. | 15 Mar 2024 | 722,046 | 0 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 43.05 per share. | 15 Mar 2024 | 408,721 | 2,449,322 (5%) | 0% | 43.0 | 17,595,439 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 12.46 per share. | 15 Mar 2024 | 310,930 | 1,439,466 (3%) | 0% | 12.5 | 3,874,188 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Exercise or conversion of derivative security received from the company (such as an option) at price $ 0.00 per share. | 15 Mar 2024 | 310,930 | 0 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 43.05 per share. | 15 Mar 2024 | 202,658 | 1,236,808 (2%) | 0% | 43.1 | 8,724,427 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 43.05 per share. | 15 Mar 2024 | 15,768 | 2,433,554 (5%) | 0% | 43.0 | 678,812 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 43.05 per share. | 15 Mar 2024 | 7,052 | 1,229,756 (2%) | 0% | 43.1 | 303,589 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 46.31 per share. | 06 Mar 2024 | 7,031 | 2,135,997 (4%) | 0% | 46.3 | 325,606 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 46.31 per share. | 06 Mar 2024 | 2,990 | 1,128,536 (2%) | 0% | 46.3 | 138,467 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 04 Mar 2024 | 135,473 | 135,473 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 04 Mar 2024 | 64,310 | 2,143,028 (4%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 04 Mar 2024 | 57,109 | 57,109 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & CHIEF SCIENTIFIC OFFICER, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 04 Mar 2024 | 27,110 | 1,131,526 (2%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Gift of securities by or to the insider at price $ 0.00 per share. | 16 Mar 2023 | 57,365 | 0 (0%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Gift of securities by or to the insider at price $ 0.00 per share. | 16 Mar 2023 | 57,365 | 0 (0%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 37.60 per share. | 16 Mar 2023 | 25,241 | 2,094,486 (4%) | 0% | 37.6 | 949,062 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 36.29 per share. | 16 Mar 2023 | 15,768 | 2,078,718 (4%) | 0% | 36.3 | 572,221 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 37.60 per share. | 16 Mar 2023 | 9,998 | 1,462,654 (3%) | 0% | 37.6 | 375,925 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 36.29 per share. | 16 Mar 2023 | 7,052 | 1,455,602 (3%) | 0% | 36.3 | 255,917 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 36.84 per share. | 15 Mar 2023 | 8,434 | 2,177,092 (4%) | 0% | 36.8 | 310,709 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 36.84 per share. | 15 Mar 2023 | 2,803 | 1,530,017 (3%) | 0% | 36.8 | 103,263 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 06 Mar 2023 | 171,488 | 171,488 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 06 Mar 2023 | 81,383 | 2,185,526 (4%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 06 Mar 2023 | 72,278 | 72,278 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 06 Mar 2023 | 34,301 | 1,532,820 (3%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 34.21 per share. | 20 May 2022 | 10,650 | 2,104,143 (4%) | 0% | 34.2 | 364,365 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 33.97 per share. | 18 May 2022 | 55,264 | 2,168,305 (4%) | 0% | 34.0 | 1,877,395 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 33.76 per share. | 18 May 2022 | 41,615 | 2,114,908 (4%) | 0% | 33.8 | 1,404,818 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 34.77 per share. | 18 May 2022 | 9,776 | 2,158,529 (4%) | 0% | 34.8 | 339,926 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 35.78 per share. | 18 May 2022 | 2,006 | 2,156,523 (4%) | 0% | 35.8 | 71,779 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 34.28 per share. | 18 May 2022 | 115 | 2,114,793 (4%) | 0% | 34.3 | 3,942 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 35.58 per share. | 16 May 2022 | 54,274 | 2,287,740 (4%) | 0% | 35.6 | 1,931,188 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 35.74 per share. | 16 May 2022 | 47,539 | 2,226,406 (4%) | 0% | 35.7 | 1,698,906 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 36.41 per share. | 16 May 2022 | 13,795 | 2,273,945 (4%) | 0% | 36.4 | 502,269 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 36.14 per share. | 16 May 2022 | 2,837 | 2,223,569 (4%) | 0% | 36.1 | 102,534 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 34.22 per share. | 16 Mar 2022 | 25,241 | 2,357,782 (5%) | 0% | 34.2 | 863,747 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 34.18 per share. | 16 Mar 2022 | 15,768 | 2,342,014 (4%) | 0% | 34.2 | 538,950 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 34.22 per share. | 16 Mar 2022 | 10,426 | 1,505,571 (3%) | 0% | 34.2 | 356,778 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 34.18 per share. | 16 Mar 2022 | 7,052 | 1,498,519 (3%) | 0% | 34.2 | 241,037 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 15 Mar 2022 | 177,461 | 177,461 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 15 Mar 2022 | 76,914 | 2,397,782 (5%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 15 Mar 2022 | 74,784 | 74,784 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 15 Mar 2022 | 32,412 | 1,520,783 (3%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 34.74 per share. | 15 Mar 2022 | 14,759 | 2,383,023 (5%) | 0% | 34.7 | 512,728 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 34.74 per share. | 15 Mar 2022 | 4,786 | 1,515,997 (3%) | 0% | 34.7 | 166,266 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 16 Mar 2021 | 298,688 | 298,688 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 16 Mar 2021 | 133,585 | 133,585 | - | - | Employee Stock Option (right to buy) | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 16 Mar 2021 | 127,209 | 2,320,868 (4%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Grant, award, or other acquisition of securities at price $ 0.00 per share. | 16 Mar 2021 | 56,892 | 1,488,371 (3%) | 0% | 0 | Common Stock | |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 18.44 per share. | 16 Mar 2021 | 25,241 | 2,193,659 (4%) | 0% | 18.4 | 465,444 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 18.44 per share. | 16 Mar 2021 | 8,890 | 1,431,479 (3%) | 0% | 18.4 | 163,932 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 19.15 per share. | 15 Mar 2021 | 28,088 | 2,218,900 (4%) | 0% | 19.1 | 537,885 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Payment of exercise price or tax liability using portion of securities received from the company at price $ 19.15 per share. | 15 Mar 2021 | 9,592 | 1,440,369 (3%) | 0% | 19.2 | 183,687 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 18.51 per share. | 16 Feb 2021 | 16,259 | 6,841,887 (14%) | 0% | 18.5 | 301,031 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 18.67 per share. | 16 Feb 2021 | 13,801 | 6,828,086 (14%) | 0% | 18.7 | 257,723 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 18.58 per share. | 16 Feb 2021 | 407 | 6,827,679 (14%) | 0% | 18.6 | 7,562 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 19.06 per share. | 10 Feb 2021 | 19,823 | 6,871,423 (14%) | 0% | 19.1 | 377,884 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 18.76 per share. | 10 Feb 2021 | 15,747 | 6,891,246 (14%) | 0% | 18.8 | 295,344 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 18.94 per share. | 10 Feb 2021 | 13,277 | 6,858,146 (14%) | 0% | 18.9 | 251,522 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 18.94 per share. | 05 Feb 2021 | 15,507 | 6,932,372 (14%) | 0% | 18.9 | 293,721 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 18.89 per share. | 05 Feb 2021 | 13,452 | 6,918,920 (14%) | 0% | 18.9 | 254,049 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 18.93 per share. | 05 Feb 2021 | 11,927 | 6,906,993 (14%) | 0% | 18.9 | 225,776 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 18.89 per share. | 03 Feb 2021 | 25,570 | 6,947,879 (14%) | 0% | 18.9 | 483,020 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 18.36 per share. | 03 Feb 2021 | 16,299 | 6,973,449 (14%) | 0% | 18.4 | 299,323 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 18.29 per share. | 01 Feb 2021 | 24,114 | 7,003,565 (14%) | 0% | 18.3 | 441,120 | Common Stock |
| Amphastar Pharmaceuticals Inc | Jack Yongfeng Zhang | Director, CEO & Chief Scientific Officer, Ten Percent Owner | Sale of securities on an exchange or to another person at price $ 18.66 per share. | 01 Feb 2021 | 13,817 | 6,989,748 (14%) | 0% | 18.7 | 257,821 | Common Stock |