Zhang Jack Y.
Insider transactions at 1 company
This page shows all SEC Form 4 filings attributed to Zhang Jack Y.. Form 4 disclosures are required whenever a corporate insider — director, officer, or 10%+ shareholder — buys, sells, or receives company stock. Each row represents a separate reported transaction. All data is sourced directly from the SEC EDGAR public database.
| Company | Title | Type | Shares | Price | Value | Date |
|---|---|---|---|---|---|---|
| AMPH | CEO & CHIEF SCIENTIFIC OFFICER | Option Exercise | 200,000 | $13.03 | $2,606,000 | Jun 13, 2025 |
| AMPH | CEO & CHIEF SCIENTIFIC OFFICER | Tax Withholding | 16,150 | $27.69 | $447,194 | Mar 14, 2025 |
| AMPH | CEO & CHIEF SCIENTIFIC OFFICER | Award / Grant | 48,996 | — | — | Mar 10, 2025 |
| AMPH | CEO & CHIEF SCIENTIFIC OFFICER | Tax Withholding | 3,069 | $28.32 | $86,914 | Mar 6, 2025 |
| AMPH | CEO & CHIEF SCIENTIFIC OFFICER | Option Exercise | 100,000 | $14.69 | $1,469,000 | Sep 13, 2024 |
| AMPH | CEO & CHIEF SCIENTIFIC OFFICER | Option Exercise | 100,000 | $14.69 | $1,469,000 | Jun 10, 2024 |
| AMPH | CEO & CHIEF SCIENTIFIC OFFICER | Award / Grant | 64,310 | — | — | Mar 4, 2024 |
| AMPH | CEO & Chief Scientific Officer | Sale | 50,514 | $54.89 | $2,772,713 | Jan 10, 2024 |
| AMPH | CEO & Chief Scientific Officer | Award / Grant | 34,301 | — | — | Mar 6, 2023 |
| AMPH | CEO & Chief Scientific Officer | Sale | 10,650 | $34.21 | $364,337 | May 20, 2022 |
| AMPH | CEO & Chief Scientific Officer | Tax Withholding | 25,241 | $34.22 | $863,747 | Mar 17, 2022 |
| AMPH | CEO & Chief Scientific Officer | Tax Withholding | 9,592 | $19.15 | $183,687 | Mar 15, 2021 |
| AMPH | CEO & Chief Scientific Officer | Sale | 16,259 | $18.51 | $300,954 | Feb 17, 2021 |
| AMPH | CEO & Chief Scientific Officer | Sale | 15,747 | $18.76 | $295,414 | Feb 12, 2021 |
| AMPH | CEO & Chief Scientific Officer | Sale | 11,927 | $18.93 | $225,778 | Feb 5, 2021 |
| AMPH | CEO & Chief Scientific Officer | Sale | 16,299 | $18.36 | $299,250 | Feb 4, 2021 |
| AMPH | CEO & Chief Scientific Officer | Sale | 24,114 | $18.29 | $441,045 | Feb 2, 2021 |
| AMPH | CEO & Chief Scientific Officer | Award / Grant | 152,724 | — | — | Mar 16, 2020 |
| AMPH | CEO & Chief Scientific Officer | Option Exercise | 514,783 | $15.84 | $8,154,163 | Mar 15, 2019 |
| AMPH | CEO & Chief Scientific Officer | Sale | 43,577 | $20.48 | $892,457 | Dec 14, 2018 |
| AMPH | CEO & Chief Scientific Officer | Tax Withholding | 284,516 | $15.39 | $4,378,701 | Jul 2, 2018 |
| AMPH | CEO & Chief Scientific Officer | Purchase | 25,000 | $16.08 | $402,000 | May 16, 2018 |
| AMPH | CEO & Chief Scientific Officer | Tax Withholding | 20,728 | $18.61 | $385,748 | Mar 26, 2018 |
| AMPH | CEO & Chief Scientific Officer | Tax Withholding | 9,589 | $19.91 | $190,917 | Mar 16, 2018 |
| AMPH | CEO & Chief Scientific Officer | Option Exercise | 264,895 | $11.51 | $3,048,941 | May 23, 2017 |
| AMPH | CEO & Chief Scientific Officer | Tax Withholding | 6,704 | $13.76 | $92,247 | Mar 27, 2017 |
| AMPH | CEO & Chief Scientific Officer | Award / Grant | 156,554 | — | — | Mar 16, 2017 |
| AMPH | CEO & Chief Science Officer | Sale | 76,152 | $20.73 | $1,578,631 | Sep 20, 2016 |
| AMPH | CEO & Chief Science Officer | Tax Withholding | 8,641 | $11.96 | $103,346 | Mar 27, 2016 |
| AMPH | CEO & Chief Science Officer | Award / Grant | 184,466 | — | — | Mar 17, 2016 |
| AMPH | CEO & Chief Science Officer | Sale | 15,046 | $14.59 | $219,521 | Dec 8, 2015 |
| AMPH | CEO & Chief Science Officer | Sale | 18,583 | $15.42 | $286,550 | Dec 1, 2015 |
| AMPH | CEO & Chief Science Officer | Tax Withholding | 4,679 | $16.29 | $76,221 | Jun 15, 2015 |
| AMPH | CEO & Chief Science Officer | Sale | 75,618 | $16.15 | $1,221,231 | Jun 10, 2015 |
| AMPH | CEO & Chief Science Officer | Option Exercise | 12,619 | $12.97 | $163,668 | Jun 8, 2015 |