36 transactions on file (0 open-market purchases and 3 open-market sales on this page).
| Date | Insider | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|
| 2026-09-02 | Zhou Rong SENIOR EVP, PRODUCTION CENTER Open-market sale | Open-market sale | −3,187 | $23.63 | −75.31K | 169,203 |
| 2026-08-11 | PRINS RICHARD K Director Open-market sale | Open-market sale | −7,973 | $20.30 | −161.85K | 29,625 |
| 2026-08-07 | PETERS WILLIAM J CFO, EVP & TREASURER · Director Option exercise | Option exercise | +5,053 | $19.79 | +100K | 181,026 |
| 2026-08-07 | PETERS WILLIAM J CFO, EVP & TREASURER · Director Open-market sale | Open-market sale | −8,180 | $22.48 | −183.89K | 172,846 |
| 2026-07-09 | Pierce Anthony T Director Grant / award | Grant / award | +7,886 | $0.00 | +0 | 7,886 |
31 more transactions are on Measure
The assistant answers from what AMPH has actually filed: 14 annual reports filed with the SEC, 13F positions from the 1 tracked investor who hold it and 3 funds that hold it. Every figure in a reply links to the filing it came from, so an answer can be checked rather than believed.
Pressing one answers it here, from AMPH's filings and figures. One a day without an account; a free account has its own, and no card.
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Source
From SEC Form 4 filings, filed by officers, directors and 10%-owners within two business days of a transaction. “Indirect” holdings (a trust, an LLC, a family member) are included and not distinguished from direct ones in this table.
Past transactions say nothing about future ones, and none of this is investment advice.
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Every Form 4 AMPH insiders file, not just the latest handful, with vesting and tax withholding struck out so what's left reads as a decision.
Every filingMeasure
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Each stake priced at the quarter it was filed, and diffed against the quarter before: who added, who trimmed, who left.
Every position they holdMeasure
Ask what a run of filings adds up to
Whether this is one decision or a pattern, and how it compares with AMPH's own history of insider activity.
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