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% | |
| Aug 11, 2026 SForm 4 → | Aug 12, 6:14 pm EDT | Richard K PrinsDirector | 7,973 | $20.30 | $161,852 | 29,625 | −21.2% | |
| Aug 7, 2026 SForm 4 → | Aug 11, 4:57 pm EDT | William J PetersCFO, EVP & TREASURER, Director | 8,180 | $22.48 | $183,886 | 172,846 | −4.52% | 10b5-1 |
| Aug 7, 2026 MForm 4 → | Aug 11, 4:57 pm EDT | William J PetersCFO, EVP & TREASURER, Director | 5,053 | $19.79 | $99,999 | 181,026 | — | 10b5-1 |
| Jul 9, 2026 AForm 4 → | Jul 13, 7:38 pm EDT | Anthony T PierceDirector | 7,886 | — | — | 7,886 | — | |
| Jun 1, 2026 AFForm 4 → | Jun 3, 9:20 pm EDT | Howard LeeDirector | 8,912 | $18.45 | $14,188 | 159,350 | — | |
| Jun 1, 2026 AForm 4 → | Jun 3, 8:34 pm EDT | Michael A ZasloffDirector | 8,143 | — | — | 37,667 | — | |
| Jun 1, 2026 AForm 4 → | Jun 3, 8:33 pm EDT | Diane G. GerstDirector | 8,143 | — | — | 31,899 | — | |
| Jun 1, 2026 AForm 4 → | Jun 3, 8:31 pm EDT | David Russell GaughDirector | 8,143 | — | — | 14,447 | — | |
| Jun 1, 2026 AForm 4 → | Jun 3, 8:29 pm EDT | Gayle DeflinDirector | 8,143 | — | — | 19,057 | — |
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 | — | |
| Aug 7, 2026 MForm 4 → | Aug 11, 4:57 pm EDT | William J PetersCFO, EVP & TREASURER, Director | 5,053 | — | — | 0 | — | 10b5-1 |
| Jul 9, 2026 AForm 4 → | Jul 13, 7:38 pm EDT | Anthony T PierceDirector | 16,646 | — | — | 16,646 | — | |
| Jun 1, 2026 AForm 4 → | Jun 3, 9:22 pm EDT | Richard K PrinsDirector | 17,365 | — | — | 17,365 | — | |
| Jun 1, 2026 AForm 4 → | Jun 3, 9:20 pm EDT | Howard LeeDirector | 17,365 | — | — | 17,365 | — | |
| Jun 1, 2026 AForm 4 → | Jun 3, 8:34 pm EDT | Michael A ZasloffDirector | 17,365 | — | — | 17,365 | — | |
| Jun 1, 2026 AForm 4 → | Jun 3, 8:33 pm EDT | Diane G. GerstDirector | 17,365 | — | — | 17,365 | — | |
| Jun 1, 2026 AForm 4 → | Jun 3, 8:31 pm EDT | David Russell GaughDirector | 17,365 | — | — | 17,365 | — | |
| Jun 1, 2026 AForm 4 → | Jun 3, 8:29 pm EDT | Gayle DeflinDirector | 17,365 | — | — | 17,365 | — |