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 |
|---|---|---|---|---|---|---|---|
| PETERS WILLIAM J | CFO, EVP & TREASURER | Sale | 2,961 | $40.85 | $120,957 | 94,738 | Jun 27, 2024 |
| Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER | Option Exercise | 100,000 | $14.69 | $1,469,000 | 2,533,554 | Jun 10, 2024 |
| Petersen Floyd F. | — | Sale | 3,000 | $41.40 | $124,200 | 78,409 | Jun 10, 2024 |
| Liawatidewi Yakob | EVP CORP ADMIN CENTER | Tax Withholding | 272 | $42.22 | $11,484 | 74,938 | Jun 4, 2024 |
| Lee Howard | — | Tax Withholding | 579 | $42.04 | $24,341 | 147,777 | Jun 3, 2024 |
| Gerst Diane G. | — | Award / Grant | 3,076 | — | — | 18,634 | Jun 3, 2024 |
| Deflin Gayle | — | Award / Grant | 3,076 | — | — | 5,792 | Jun 3, 2024 |
| Petersen Floyd F. | — | Sale | 500 | $42.65 | $21,325 | 78,333 | Jun 3, 2024 |
| PRINS RICHARD K | — | Award / Grant | 3,076 | — | — | 33,971 | Jun 3, 2024 |
| ZASLOFF MICHAEL A | — | Award / Grant | 3,076 | — | — | 24,402 | Jun 3, 2024 |
| PETERS WILLIAM J | CFO, EVP & TREASURER | Tax Withholding | 387 | $43.48 | $16,827 | 97,268 | May 19, 2024 |
| Petersen Floyd F. | — | Sale | 500 | $41.67 | $20,835 | 78,833 | May 1, 2024 |
| Petersen Floyd F. | — | Sale | 500 | $43.43 | $21,715 | 79,333 | Apr 1, 2024 |
| Liawatidewi Yakob | EVP CORP ADMIN CENTER | Tax Withholding | 1,027 | $43.05 | $44,212 | 78,175 | Mar 17, 2024 |
| Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Tax Withholding | 2,355 | $43.05 | $101,383 | 119,977 | Mar 17, 2024 |
| PETERS WILLIAM J | CFO, EVP & TREASURER | Tax Withholding | 2,285 | $43.05 | $98,369 | 107,015 | Mar 16, 2024 |
| Luo Mary Z. | COO,Chief Scientist & Chairman | Tax Withholding | 202,658 | $43.05 | $8,724,427 | 1,236,808 | Mar 15, 2024 |
| PETERS WILLIAM J | CFO, EVP & TREASURER | Sale | 4,681 | $46.98 | $219,913 | 111,541 | Mar 6, 2024 |
| Liawatidewi Yakob | EVP CORP ADMIN CENTER | Tax Withholding | 1,221 | $46.31 | $56,545 | 79,202 | Mar 6, 2024 |
| Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Tax Withholding | 1,390 | $46.31 | $64,371 | 123,551 | Mar 6, 2024 |
| Luo Mary Z. | COO, Chief Scientist, Chairman | Tax Withholding | 7,031 | $46.31 | $325,606 | 2,135,997 | Mar 6, 2024 |
| ZASLOFF MICHAEL A | — | Sale | 9,389 | $47.06 | $441,846 | 24,437 | Mar 5, 2024 |
| Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER | Award / Grant | 64,310 | — | — | 2,143,028 | Mar 4, 2024 |
| Liawatidewi Yakob | EVP CORP ADMIN CENTER | Award / Grant | 10,754 | — | — | 80,423 | Mar 4, 2024 |
| Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Award / Grant | 12,521 | — | — | 124,941 | Mar 4, 2024 |
| PETERS WILLIAM J | CFO, EVP & TREASURER | Award / Grant | 19,440 | — | — | 120,800 | Mar 4, 2024 |
| Petersen Floyd F. | — | Sale | 451 | $45.60 | $20,566 | 79,882 | Mar 1, 2024 |
| Petersen Floyd F. | — | Sale | 474 | $53.07 | $25,155 | 80,359 | Feb 1, 2024 |
| Zhang Jack Y. | CEO & Chief Scientific Officer | Sale | 50,514 | $54.89 | $2,772,713 | 1,107,052 | Jan 10, 2024 |
| Luo Mary Z. | COO,Chief Scientist & Chairman | Sale | 3,714 | $58.35 | $216,712 | 1,235,802 | Jan 8, 2024 |
| Petersen Floyd F. | — | Sale | 353 | $61.70 | $21,780 | 80,833 | Jan 2, 2024 |
| Zhou Rong | Senior EVP, Production Center | Sale | 4,316 | $58.58 | $252,831 | 112,420 | Dec 1, 2023 |
| Petersen Floyd F. | — | Sale | 135 | $57.24 | $7,727 | 81,698 | Dec 1, 2023 |
| PRINS RICHARD K | — | Gift | 1,000 | — | — | 30,895 | Nov 17, 2023 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Sale | 30,162 | $55.67 | $1,679,119 | 116,228 | Nov 14, 2023 |
| Deflin Gayle | — | Sale | 4,163 | $55.45 | $230,838 | 2,716 | Nov 14, 2023 |
| PRINS RICHARD K | — | Sale | 5,000 | $52.50 | $262,500 | 35,895 | Nov 13, 2023 |
| Petersen Floyd F. | — | Sale | 500 | $45.30 | $22,650 | 81,833 | Nov 1, 2023 |
| Petersen Floyd F. | — | Sale | 500 | $45.78 | $22,890 | 82,333 | Oct 2, 2023 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Option Exercise | 25,250 | $13.03 | $329,008 | 162,103 | Sep 6, 2023 |
| Liawatidewi Yakob | EVP Corp Admin Center | Option Exercise | 5,497 | $20.23 | $111,204 | 78,485 | Aug 28, 2023 |
| PRINS RICHARD K | — | Sale | 2,000 | $52.50 | $105,000 | 40,895 | Aug 18, 2023 |
| ZASLOFF MICHAEL A | — | Sale | 12,759 | $57.22 | $730,070 | 33,826 | Aug 15, 2023 |
| PRINS RICHARD K | — | Sale | 4,163 | $57.39 | $238,915 | 42,895 | Aug 15, 2023 |
| Zhou Rong | EVP, Production Center | Option Exercise | 9,651 | $11.33 | $109,346 | 112,341 | Jun 20, 2023 |
| Zhou Rong | EVP, Production Center | Option Exercise | 4,631 | $14.95 | $69,233 | 101,519 | Jun 15, 2023 |
| PETERS WILLIAM J | CFO, EVP & Treasurer | Option Exercise | 36,868 | $19.79 | $729,618 | 142,471 | Jun 15, 2023 |
| Zhou Rong | EVP, Production Center | Option Exercise | 5,000 | $14.40 | $72,000 | 93,313 | Jun 13, 2023 |
| Lee Howard | — | Tax Withholding | 375 | $45.67 | $17,126 | 145,280 | Jun 10, 2023 |
| PRINS RICHARD K | — | Award / Grant | 2,716 | — | — | 47,058 | Jun 5, 2023 |