Company · CIK 0001297184 · SIC 2834 — Pharmaceutical Preparations · Nasdaq
Amphastar Pharmaceuticals, Inc. · AMPH
Insider activity reported against this company. All insider holders · On EDGAR ↗
Reported at this company — common stock
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 21, 2026 SForm 4 → | Sep 23, 6:02 pm EDT | William J PetersCFO, EVP & TREASURER, Director | 4,139 | $25.00 | $103,475 | 168,707 | −2.39% | 10b5-1 |
| Sep 16, 2026 SForm 4 → | Sep 17, 6:19 pm EDT | Rong ZhouSENIOR EVP, PRODUCTION CENTER | 10,000 | $23.94 | $239,404 | 169,203 | −5.58% | |
| Sep 16, 2026 MForm 4 → | Sep 17, 6:19 pm EDT | Rong ZhouSENIOR EVP, PRODUCTION CENTER | 10,000 | $13.35 | $133,500 | 179,203 | — | |
| Sep 2, 2026 SForm 4 → | Sep 3, 7:42 pm EDT | Rong ZhouSENIOR EVP, PRODUCTION CENTER | 3,187 | $23.63 | $75,306 | 169,203 | −1.85% |
Reported at this company — derivatives (options, RSUs, warrants)
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 16, 2026 MForm 4 → | Sep 17, 6:19 pm EDT | Rong ZhouSENIOR EVP, PRODUCTION CENTER | 10,000 | — | — | 19,424 | — |