Amphastar P (AMPH)
Insider transactions
A complete record of Form 4 filings tracking every share acquisition and disposal by executives, directors, and senior officers. Filterable by date range and transaction type, the table exposes the direct market actions of those with the deepest knowledge of a company's operations — providing a factual, data-driven signal of internal conviction that complements traditional fundamental and technical analysis.
Transaction date | Executive | Executive Title | Security Type | Acquisition / Disposal | Shares | Share price |
|---|---|---|---|---|---|---|
| Sep 21, 2026 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Common Stock | Disposal | 4,139 | $25 |
| Sep 16, 2026 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Employee Stock Option (right to buy) | Disposal | 10,000 | $0 |
| Sep 16, 2026 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Common Stock | Disposal | 10,000 | $23.94 |
| Sep 16, 2026 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Common Stock | Acquisition | 10,000 | $13.35 |
| Sep 16, 2026 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Employee Stock Option (right to buy) | Acquisition | 10,000 | $0 |
| Sep 2, 2026 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Common Stock | Disposal | 3,187 | $23.63 |
| Aug 11, 2026 | PRINS, RICHARD K | Director | Common Stock | Disposal | 7,973 | $20.30 |
| Aug 7, 2026 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Employee Stock Option (right to buy) | Disposal | 5,053 | $0 |
| Aug 7, 2026 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Common Stock | Disposal | 8,180 | $22.48 |
| Aug 7, 2026 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Common Stock | Acquisition | 5,053 | $19.79 |
| Aug 7, 2026 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Employee Stock Option (right to buy) | Acquisition | 5,053 | $0 |
| Jul 9, 2026 | PIERCE, ANTHONY T | Director | Common Stock | Acquisition | 7,886 | $0 |
| Jul 9, 2026 | PIERCE, ANTHONY T | Director | Stock Option (right to buy) | Acquisition | 16,646 | $0 |
| Jun 2, 2026 | LEE, HOWARD | Director | Common Stock | Disposal | 769 | $18.45 |
| Jun 1, 2026 | GAUGH, DAVID RUSSELL | Director | Stock Option (right to buy) | Acquisition | 17,365 | $0 |
| Jun 1, 2026 | PRINS, RICHARD K | Director | Common Stock | Acquisition | 8,143 | $0 |
| Jun 1, 2026 | LEE, HOWARD | Director | Common Stock | Acquisition | 8,143 | $0 |
| Jun 1, 2026 | PRINS, RICHARD K | Director | Stock Option (right to buy) | Acquisition | 17,365 | $0 |
| Jun 1, 2026 | ZASLOFF, MICHAEL A | Director | Common Stock | Acquisition | 17,365 | $0 |
| Jun 1, 2026 | DEFLIN, GAYLE | Director | Stock Option (right to buy) | Acquisition | 17,365 | $0 |
| Jun 1, 2026 | GAUGH, DAVID RUSSELL | Director | Common Stock | Acquisition | 8,143 | $0 |
| Jun 1, 2026 | GERST, DIANE G. | Director | Stock Option (right to buy) | Acquisition | 17,365 | $0 |
| Jun 1, 2026 | ZASLOFF, MICHAEL A | Director | Common Stock | Acquisition | 8,143 | $0 |
| Jun 1, 2026 | DEFLIN, GAYLE | Director | Common Stock | Acquisition | 8,143 | $0 |
| Jun 1, 2026 | LEE, HOWARD | Director | Stock Option (right to buy) | Acquisition | 17,365 | $0 |
| Jun 1, 2026 | GERST, DIANE G. | Director | Common Stock | Acquisition | 8,143 | $0 |
| Mar 15, 2026 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Common Stock | Disposal | 2,908 | $18.18 |
| Mar 15, 2026 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Common Stock | Disposal | 1,225 | $18.18 |
| Mar 15, 2026 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Common Stock | Disposal | 1,033 | $18.18 |
| Mar 15, 2026 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Common Stock | Disposal | 9,784 | $18.18 |
| Mar 15, 2026 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Common Stock | Disposal | 1,973 | $18.18 |
| Mar 10, 2026 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Common Stock | Disposal | 4,395 | $18.91 |
| Mar 10, 2026 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Common Stock | Disposal | 3,297 | $18.91 |
| Mar 10, 2026 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Common Stock | Disposal | 2,215 | $18.91 |
| Mar 10, 2026 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Common Stock | Disposal | 1,870 | $18.91 |
| Mar 10, 2026 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Common Stock | Disposal | 14,785 | $18.91 |
| Mar 9, 2026 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Employee Stock Option (right to buy) | Acquisition | 149,472 | $0 |
| Mar 9, 2026 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Employee Stock Option (right to buy) | Acquisition | 121,071 | $0 |
| Mar 9, 2026 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Common Stock | Acquisition | 58,693 | $0 |
| Mar 9, 2026 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Employee Stock Option (right to buy) | Acquisition | 372,338 | $0 |
| Mar 9, 2026 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Common Stock | Acquisition | 72,462 | $0 |
| Mar 9, 2026 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Common Srock | Acquisition | 39,432 | $0 |
| Mar 9, 2026 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Employee Stock Option (right to buy) | Acquisition | 81,341 | $0 |
| Mar 9, 2026 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Employee Stock Option (right to buy) | Acquisition | 73,126 | $0 |
| Mar 9, 2026 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Common Stock | Acquisition | 180,504 | $0 |
| Mar 9, 2026 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Common Stock | Acquisition | 35,450 | $0 |
| Mar 6, 2026 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Common Stock | Disposal | 7,773 | $19.34 |
| Mar 6, 2026 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Common Stock | Disposal | 2,146 | $19.34 |
| Mar 6, 2026 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Common Stock | Disposal | 1,144 | $19.34 |
| Mar 6, 2026 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Common Stock | Disposal | 3,077 | $19.34 |
| Mar 6, 2026 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Common Stock | Disposal | 1,357 | $19.34 |
| Mar 4, 2026 | PETERS, WILLIAM J | Director, CFO, EVP & TREASURER | Common Stock | Disposal | 1,744 | $19.96 |
| Mar 4, 2026 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Common Stock | Disposal | 1,124 | $19.96 |
| Mar 4, 2026 | LIAWATIDEWI, YAKOB | Director, EVP CORP ADMIN CENTER | Common Stock | Disposal | 965 | $19.96 |
| Mar 4, 2026 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Common Stock | Disposal | 5,769 | $19.96 |
| Mar 4, 2026 | ZHANG, JACK Y. | Director, CEO & CHIEF SCIENTIFIC OFFICER, 10% Owner | Common Stock | Disposal | 2,432 | $19.96 |
| Dec 17, 2025 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Employee Stock Option (right to buy) | Disposal | 9,787 | $0 |
| Dec 17, 2025 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Common Stock | Acquisition | 9,787 | $11.33 |
| Dec 17, 2025 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Common Stock | Disposal | 9,787 | $26.20 |
| Dec 17, 2025 | ZHOU, RONG | SENIOR EVP, PRODUCTION CENTER | Employee Stock Option (right to buy) | Acquisition | 9,787 | $0 |
| Dec 12, 2025 | PETERSEN, FLOYD F. | Director | Common Stock | Disposal | 2,426 | $25.92 |
| Dec 11, 2025 | PETERSEN, FLOYD F. | Director | Common Stock | Disposal | 1,737 | $25.69 |
| Nov 25, 2025 | PRINS, RICHARD K | Director | Stock Option (right to buy) | Disposal | 4,179 | $0 |
| Nov 25, 2025 | PRINS, RICHARD K | Director | Common Stock | Disposal | 4,179 | $27.10 |
| Nov 25, 2025 | PRINS, RICHARD K | Director | Common Stock | Acquisition | 4,179 | $16.69 |
| Nov 25, 2025 | PRINS, RICHARD K | Director | Stock Option (right to buy) | Acquisition | 4,179 | $0 |
| Nov 13, 2025 | PETERSEN, FLOYD F. | Director | Common Stock | Disposal | 16,679 | $26.49 |
| Nov 13, 2025 | PETERSEN, FLOYD F. | Director | Stock Option (right to buy) | Disposal | 16,679 | $0 |
| Nov 13, 2025 | PETERSEN, FLOYD F. | Director | Common Stock | Acquisition | 16,679 | $16.69 |
| Nov 13, 2025 | PETERSEN, FLOYD F. | Director | Stock Option (right to buy) | Acquisition | 16,679 | $0 |