Filings under AMPH by American Physicians Service Group Inc (CIK 0000724024) from Sep 5, 2005 to Nov 30, 2010 belong to a different issuer and are not shown.
The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
| Date | Insider | Role | Action | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 2, 2026 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Sell(S) | 3K | $23.63 | $75K |
| Aug 11, 2026 | Prins Richard K | Director | Sell(S) | 8K | $20.30 | $162K |
| Aug 7, 2026 | Peters William J | CFO, EVP & TREASURER, Director | Option exercise(M) | 5K | — | $0 |
| Aug 7, 2026 | Peters William J | CFO, EVP & TREASURER, Director | Sell(S) | 8K | $22.48 | $184K |
| Aug 7, 2026 | Peters William J | CFO, EVP & TREASURER, Director | Option exercise(M) | 5K | $19.79 | $100K |
| Jul 9, 2026 | Pierce Anthony T | Director | Grant(A) | 17K | — | $0 |
| Jul 9, 2026 | Pierce Anthony T | Director | Grant(A) | 8K | — | $0 |
| Jun 2, 2026 | Lee Howard | Director | Tax withholding(F) | 769 | $18.45 | $14K |
| Jun 1, 2026 | Prins Richard K | Director | Grant(A) | 8K | — | $0 |
| Jun 1, 2026 | Prins Richard K | Director | Grant(A) | 17K | — | $0 |
| Jun 1, 2026 | Lee Howard | Director | Grant(A) | 8K | — | $0 |
| Jun 1, 2026 | Lee Howard | Director | Grant(A) | 17K | — | $0 |
| Jun 1, 2026 | Zasloff Michael A | Director | Grant(A) | 8K | — | $0 |
| Jun 1, 2026 | Zasloff Michael A | Director | Grant(A) | 17K | — | $0 |
| Jun 1, 2026 | Gerst Diane G. | Director | Grant(A) | 8K | — | $0 |
| Jun 1, 2026 | Gerst Diane G. | Director | Grant(A) | 17K | — | $0 |
| Jun 1, 2026 | Gaugh David Russell | Director | Grant(A) | 8K | — | $0 |
| Jun 1, 2026 | Gaugh David Russell | Director | Grant(A) | 17K | — | $0 |
| Jun 1, 2026 | Deflin Gayle | Director | Grant(A) | 8K | — | $0 |
| Jun 1, 2026 | Deflin Gayle | Director | Grant(A) | 17K | — | $0 |
| Mar 15, 2026 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Tax withholding(F) | 10K | $18.18 | $178K |
| Mar 15, 2026 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Tax withholding(F) | 3K | $18.18 | $53K |
| Mar 15, 2026 | Peters William J | CFO, EVP & TREASURER, Director | Tax withholding(F) | 2K | $18.18 | $36K |
| Mar 15, 2026 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Tax withholding(F) | 1K | $18.18 | $22K |
| Mar 15, 2026 | Liawatidewi Yakob | EVP CORP ADMIN CENTER, Director | Tax withholding(F) | 1K | $18.18 | $19K |
| Mar 10, 2026 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Tax withholding(F) | 4K | $18.91 | $83K |
| Mar 10, 2026 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Tax withholding(F) | 15K | $18.91 | $280K |
| Mar 10, 2026 | Peters William J | CFO, EVP & TREASURER, Director | Tax withholding(F) | 3K | $18.91 | $62K |
| Mar 10, 2026 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Tax withholding(F) | 2K | $18.91 | $42K |
| Mar 10, 2026 | Liawatidewi Yakob | EVP CORP ADMIN CENTER, Director | Tax withholding(F) | 2K | $18.91 | $35K |
| Mar 9, 2026 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Grant(A) | 181K | — | $0 |
| Mar 9, 2026 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Grant(A) | 72K | — | $0 |
| Mar 9, 2026 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Grant(A) | 372K | — | $0 |
| Mar 9, 2026 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Grant(A) | 149K | — | $0 |
| Mar 9, 2026 | Peters William J | CFO, EVP & TREASURER, Director | Grant(A) | 59K | — | $0 |
| Mar 9, 2026 | Peters William J | CFO, EVP & TREASURER, Director | Grant(A) | 121K | — | $0 |
| Mar 9, 2026 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Grant(A) | 39K | — | $0 |
| Mar 9, 2026 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Grant(A) | 81K | — | $0 |
| Mar 9, 2026 | Liawatidewi Yakob | EVP CORP ADMIN CENTER, Director | Grant(A) | 35K | — | $0 |
| Mar 9, 2026 | Liawatidewi Yakob | EVP CORP ADMIN CENTER, Director | Grant(A) | 73K | — | $0 |
| Mar 6, 2026 | Luo Mary Z. | COO, Chief Scientist, Chairman, Director, 10% Owner | Tax withholding(F) | 3K | $19.34 | $60K |
| Mar 6, 2026 | Luo Mary Z. | COO, Chief Scientist, Chairman, Director, 10% Owner | Tax withholding(F) | 8K | $19.34 | $150K |
| Mar 6, 2026 | Peters William J | CFO, EVP & TREASURER, Director | Tax withholding(F) | 2K | $19.34 | $42K |
| Mar 6, 2026 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Tax withholding(F) | 1K | $19.34 | $26K |
| Mar 6, 2026 | Liawatidewi Yakob | EVP CORP ADMIN CENTER, Director | Tax withholding(F) | 1K | $19.34 | $22K |
| Mar 4, 2026 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Tax withholding(F) | 6K | $19.96 | $115K |
| Mar 4, 2026 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Tax withholding(F) | 2K | $19.96 | $49K |
| Mar 4, 2026 | Peters William J | CFO, EVP & TREASURER, Director | Tax withholding(F) | 2K | $19.96 | $35K |
| Mar 4, 2026 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Tax withholding(F) | 1K | $19.96 | $22K |
| Mar 4, 2026 | Liawatidewi Yakob | EVP CORP ADMIN CENTER, Director | Tax withholding(F) | 965 | $19.96 | $19K |
| Dec 17, 2025 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Option exercise(M) | 10K | $11.33 | $111K |
| Dec 17, 2025 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Sell(S) | 10K | $26.20 | $256K |
| Dec 17, 2025 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Option exercise(M) | 10K | — | $0 |
| Dec 12, 2025 | Petersen Floyd F. | Director | Sell(S) | 2K | $25.92 | $63K |
| Dec 11, 2025 | Petersen Floyd F. | Director | Sell(S) | 2K | $25.69 | $45K |
| Nov 25, 2025 | Prins Richard K | Director | Sell(S) | 4K | $27.10 | $113K |
| Nov 25, 2025 | Prins Richard K | Director | Option exercise(M) | 4K | $16.69 | $70K |
| Nov 25, 2025 | Prins Richard K | Director | Option exercise(M) | 4K | — | $0 |
| Nov 13, 2025 | Petersen Floyd F. | Director | Sell(S) | 17K | $26.49 | $442K |
| Nov 13, 2025 | Petersen Floyd F. | Director | Option exercise(M) | 17K | $16.69 | $278K |
| Nov 13, 2025 | Petersen Floyd F. | Director | Option exercise(M) | 17K | — | $0 |
| Nov 3, 2025 | Petersen Floyd F. | Director | Sell(S) | 500 | $25.27 | $13K |
| Oct 1, 2025 | Petersen Floyd F. | Director | Sell(S) | 500 | $27.20 | $14K |
| Sep 2, 2025 | Petersen Floyd F. | Director | Sell(S) | 500 | $30.98 | $15K |
| Aug 1, 2025 | Petersen Floyd F. | Director | Sell(S) | 500 | $20.83 | $10K |
| Jul 18, 2025 | Gaugh David Russell | Director | Grant(A) | 6K | — | $0 |
| Jul 18, 2025 | Gaugh David Russell | Director | Grant(A) | 14K | — | $0 |
| Jul 2, 2025 | Petersen Floyd F. | Director | Sell(S) | 500 | $23.47 | $12K |
| Jun 13, 2025 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Option exercise(M) | 200K | $13.03 | $2.6M |
| Jun 13, 2025 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Option exercise(M) | 200K | — | $0 |
| Jun 3, 2025 | Lee Howard | Director | Tax withholding(F) | 923 | $26.01 | $24K |
| Jun 2, 2025 | Zasloff Michael A | Director | Grant(A) | 5K | — | $0 |
| Jun 2, 2025 | Zasloff Michael A | Director | Grant(A) | 11K | — | $0 |
| Jun 2, 2025 | Petersen Floyd F. | Director | Grant(A) | 5K | — | $0 |
| Jun 2, 2025 | Petersen Floyd F. | Director | Sell(S) | 500 | $25.67 | $13K |
| Jun 2, 2025 | Petersen Floyd F. | Director | Grant(A) | 11K | — | $0 |
| Jun 2, 2025 | Prins Richard K | Director | Grant(A) | 5K | — | $0 |
| Jun 2, 2025 | Prins Richard K | Director | Grant(A) | 11K | — | $0 |
| Jun 2, 2025 | Gerst Diane G. | Director | Grant(A) | 5K | — | $0 |
| Jun 2, 2025 | Gerst Diane G. | Director | Grant(A) | 11K | — | $0 |
| Jun 2, 2025 | Deflin Gayle | Director | Grant(A) | 5K | — | $0 |
| Jun 2, 2025 | Deflin Gayle | Director | Grant(A) | 11K | — | $0 |
| Jun 2, 2025 | Lee Howard | Director | Grant(A) | 5K | — | $0 |
| Jun 2, 2025 | Lee Howard | Director | Grant(A) | 11K | — | $0 |
| May 19, 2025 | Peters William J | CFO, EVP & TREASURER, Director | Tax withholding(F) | 273 | $24.79 | $7K |
| May 1, 2025 | Petersen Floyd F. | Director | Sell(S) | 500 | $24.08 | $12K |
| Apr 1, 2025 | Petersen Floyd F. | Director | Sell(S) | 500 | $28.38 | $14K |
| Mar 17, 2025 | Peters William J | CFO, EVP & TREASURER, Director | Tax withholding(F) | 3K | $27.69 | $83K |
| Mar 17, 2025 | Liawatidewi Yakob | EVP CORP ADMIN CENTER, Director | Tax withholding(F) | 2K | $27.69 | $48K |
| Mar 17, 2025 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Tax withholding(F) | 7K | $27.69 | $200K |
| Mar 17, 2025 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Tax withholding(F) | 16K | $27.69 | $447K |
| Mar 17, 2025 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Tax withholding(F) | 2K | $27.69 | $54K |
| Mar 15, 2025 | Peters William J | CFO, EVP & TREASURER, Director | Tax withholding(F) | 2K | $26.66 | $52K |
| Mar 15, 2025 | Liawatidewi Yakob | EVP CORP ADMIN CENTER, Director | Tax withholding(F) | 1K | $26.66 | $27K |
| Mar 15, 2025 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Tax withholding(F) | 10K | $26.66 | $260K |
| Mar 15, 2025 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Tax withholding(F) | 4K | $26.66 | $110K |
| Mar 15, 2025 | Zhou Rong | SENIOR EVP, PRODUCTION CENTER | Tax withholding(F) | 1K | $26.66 | $33K |
| Mar 14, 2025 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Option exercise(M) | 290K | $14.69 | $4.3M |
| Mar 14, 2025 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Tax withholding(F) | 226K | $26.66 | $6.0M |
| Mar 14, 2025 | Zhang Jack Y. | CEO & CHIEF SCIENTIFIC OFFICER, Director, 10% Owner | Option exercise(M) | 211K | $14.69 | $3.1M |
Insider transactions sourced from SEC EDGAR Form 4 filings, normalized within minutes of acceptance. "Buy"/"Sell" mark open-market transactions (codes P/S), the tradeable signal. Awards, option exercises and tax-withholding are shown with their raw code. All data is public domain.
Issuer: Amphastar Pharmaceuticals, Inc., SEC CIK 0001297184. The symbol on a Form 4 is typed by the filer, so this page follows the issuer with the newest filing under AMPH and shows every filing by that issuer. Earlier filings under the same symbol by another issuer are left out.
Coverage: Form 4 filings indexed 2006-01-02 → 2026-09-12. Earlier history is backfilling; this window widens as it deepens.
Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).
Connected pages for AMPH