Form4.ai tracks every SEC insider trade in real time. See every AMPH insider filing with a free account — no card.
See every AMPH insider filing — free account, no card.
Free accountAmphastar Pharmaceuticals, Inc. (AMPH) has 5 SEC Form 4 insider filings on record in the last 90 days. No insider purchases were filed — 4 sales totalling $625K. Most recent filing: Sept. 23, 2026.
Open-market value, last 90 days
Form 4 filings by type, last 90 days
| Date | Insider | Trade | Value | Price since buy |
|---|---|---|---|---|
| Sep 23, 2026 SEC filing | PETERS WILLIAM J CFO, EVP & TREASURER | Sold | $103,475 | — |
| Sep 17, 2026 SEC filing | Zhou Rong SENIOR EVP, PRODUCTION CENTER | Cashless exercise | $105,904 | — |
| Sep 3, 2026 SEC filing | Zhou Rong SENIOR EVP, PRODUCTION CENTER | Sold | $75,306 | — |
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Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.