Amphastar Pharmaceuticals, Inc. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| Petersen Floyd F. | — | Award / Grant | 2,716 | — | — | 82,833 | Jun 5, 2023 |
| Gerst Diane G. | — | Award / Grant | 2,716 | — | — | 15,558 | Jun 5, 2023 |
| ZASLOFF MICHAEL A | — | Award / Grant | 2,716 | — | — | 46,585 | Jun 5, 2023 |
| Lee Howard | — | Award / Grant | 2,716 | — | — | 145,655 | Jun 5, 2023 |
| Deflin Gayle | — | Award / Grant | 2,716 | — | — | 6,879 | Jun 5, 2023 |
| Liawatidewi Yakob | EVP Corp Admin Center | Tax Withholding | 378 | $46.70 | $17,653 | 69,669 | Jun 4, 2023 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Sale | 11,000 | $46.35 | $509,850 | 105,603 | Jun 2, 2023 |
| Lee Howard | — | Sale | 16,679 | $45.02 | $750,889 | 142,939 | Jun 1, 2023 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Option Exercise | 10,500 | $13.35 | $140,175 | 115,648 | May 18, 2023 |
| Zhou Rong | EVP, Production Center | Sale | 10,000 | $44.21 | $442,100 | 87,598 | May 18, 2023 |
| Deflin Gayle | — | Sale | 4,519 | $44.01 | $198,881 | 4,163 | May 18, 2023 |
| Petersen Floyd F. | — | Sale | 5,000 | $43.13 | $215,650 | 80,117 | May 17, 2023 |
| Deflin Gayle | — | Sale | 1,500 | $43.15 | $64,725 | 8,682 | May 15, 2023 |
| ZASLOFF MICHAEL A | — | Sale | 7,500 | $42.18 | $316,350 | 43,869 | May 15, 2023 |
| PRINS RICHARD K | — | Option Exercise | 5,000 | $16.69 | $83,450 | 49,342 | May 15, 2023 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Option Exercise | 5,632 | $13.35 | $75,187 | 110,780 | Apr 17, 2023 |
| Liawatidewi Yakob | EVP Corp Admin Center | Option Exercise | 11,494 | $20.23 | $232,524 | 80,709 | Apr 13, 2023 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Option Exercise | 4,868 | $13.35 | $64,988 | 110,016 | Apr 13, 2023 |
| Liawatidewi Yakob | EVP Corp Admin Center | Option Exercise | 5,000 | $20.23 | $101,150 | 74,215 | Apr 10, 2023 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Option Exercise | 10,032 | $13.35 | $133,927 | 115,180 | Apr 10, 2023 |
| Petersen Floyd F. | — | Sale | 491 | $37.72 | $18,521 | 85,117 | Apr 3, 2023 |
| Liawatidewi Yakob | EVP Corp Admin Center | Tax Withholding | 1,620 | $37.60 | $60,912 | 70,888 | Mar 17, 2023 |
| Zhou Rong | EVP, Production Center | Tax Withholding | 2,283 | $37.60 | $85,841 | 89,499 | Mar 17, 2023 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Tax Withholding | 4,995 | $37.60 | $187,812 | 109,310 | Mar 17, 2023 |
| Luo Mary Z. | COO,Chief Scientist & Chairman | Tax Withholding | 9,998 | $37.60 | $375,925 | 1,462,654 | Mar 16, 2023 |
| Liawatidewi Yakob | EVP Corp Admin Center | Tax Withholding | 1,851 | $36.84 | $68,191 | 72,508 | Mar 15, 2023 |
| Zhou Rong | EVP, Production Center | Tax Withholding | 2,057 | $36.84 | $75,780 | 91,782 | Mar 15, 2023 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Sale | 12,776 | $36.43 | $465,430 | 118,451 | Mar 15, 2023 |
| Luo Mary Z. | COO, Chief Sci. and Chairman | Tax Withholding | 2,803 | $36.84 | $103,263 | 1,530,017 | Mar 15, 2023 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Award / Grant | 23,925 | — | — | 124,539 | Mar 6, 2023 |
| Liawatidewi Yakob | EVP Corp Admin Center | Award / Grant | 12,752 | — | — | 74,359 | Mar 6, 2023 |
| Zhou Rong | EVP, Production Center | Award / Grant | 15,129 | — | — | 93,839 | Mar 6, 2023 |
| Zhang Jack Y. | CEO & Chief Scientific Officer | Award / Grant | 34,301 | — | — | 1,532,820 | Mar 6, 2023 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Sale | 10,974 | $36.33 | $398,685 | 100,614 | Mar 1, 2023 |
| Petersen Floyd F. | — | Sale | 412 | $36.59 | $15,075 | 85,695 | Mar 1, 2023 |
| Petersen Floyd F. | — | Sale | 500 | $30.35 | $15,175 | 86,108 | Feb 1, 2023 |
| Petersen Floyd F. | — | Sale | 500 | $27.94 | $13,970 | 86,608 | Jan 3, 2023 |
| Petersen Floyd F. | — | Sale | 500 | $30.13 | $15,065 | 87,108 | Dec 1, 2022 |
| Petersen Floyd F. | — | Sale | 500 | $31.13 | $15,565 | 87,608 | Nov 1, 2022 |
| Petersen Floyd F. | — | Sale | 500 | $28.59 | $14,295 | 88,108 | Oct 3, 2022 |
| Petersen Floyd F. | — | Sale | 500 | $29.44 | $14,720 | 88,608 | Sep 1, 2022 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Option Exercise | 10,000 | $13.35 | $133,500 | 110,480 | Aug 9, 2022 |
| Liawatidewi Yakob | EVP Corp Admin Center | Option Exercise | 3,055 | $19.79 | $60,458 | 64,662 | Aug 8, 2022 |
| Petersen Floyd F. | — | Sale | 500 | $37.48 | $18,740 | 89,108 | Aug 1, 2022 |
| Gerst Diane G. | — | Option Exercise | 1,520 | $20.08 | $30,522 | 14,362 | Jul 18, 2022 |
| Liawatidewi Yakob | EVP Corp Admin Center | Sale | 3,478 | $35.94 | $124,999 | 68,966 | Jul 15, 2022 |
| Gerst Diane G. | — | Option Exercise | 1,521 | $20.08 | $30,542 | 14,363 | Jul 11, 2022 |
| Gerst Diane G. | — | Option Exercise | 1,813 | $20.08 | $36,405 | 14,655 | Jul 5, 2022 |
| Petersen Floyd F. | — | Sale | 500 | $34.78 | $17,390 | 89,608 | Jul 1, 2022 |
| Gerst Diane G. | — | Option Exercise | 3,333 | $20.03 | $66,760 | 16,175 | Jun 30, 2022 |