CIK 0001297184 · Large accelerated filer
Amphastar Pharmaceuticals, Inc.
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- AMPH
- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- FY end
- Dec 31
- Entity type
- operating
- EIN
- 330702205
- Phone
- 909-980-9484
- Business address
- 11570 SIXTH STREET, RANCHO CUCAMONGA, CA, 91730
- Open-market buys, last 90 days
- $0
- in 0 filings
- Open-market sales, last 90 days
- $1,232,854
- in 4 filings, $918K under 10b5-1 plans
Net −$1,232,854. Shares bought or sold at a price by officers, directors and 10% owners (Form 4 codes P and S). Grants, option exercises and tax withholding aren't counted.
Who's trading
90 days
| Date | Insider | Transaction | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|
| 2026-06-01 | Deflin Gayle Director | Grant or award | +8,143 | 19,057 | ||
| 2026-06-01 | Deflin Gayle Director | Grant or award · Stock Option (right to buy) | +17,365 | 17,365 | ||
| 2026-06-01 | Gerst Diane G. Director | Grant or award | +8,143 | 31,899 | ||
| 2026-06-01 | Gerst Diane G. Director | Grant or award · Stock Option (right to buy) | +17,365 | 17,365 | ||
| 2026-06-01 | Lee Howard Director | Grant or award | +8,143 | 160,119 | ||
| 2026-06-01 | Lee Howard Director | Grant or award · Stock Option (right to buy) | +17,365 | 17,365 | ||
| 2026-06-01 | PRINS RICHARD K Director | Grant or award | +8,143 | 37,598 | ||
| 2026-06-01 | PRINS RICHARD K Director | Grant or award · Stock Option (right to buy) | +17,365 | 17,365 | ||
| 2026-06-01 | ZASLOFF MICHAEL A Director | Grant or award | +8,143 | 37,667 | ||
| 2026-06-01 | ZASLOFF MICHAEL A Director | Grant or award · Common Stock | +17,365 | 17,365 | ||
| 2026-03-15 | Liawatidewi Yakob EVP CORP ADMIN CENTER | Shares withheld for taxes | −1,033 | $18.18 | $19K | 121,892 |
| 2026-03-15 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | Shares withheld for taxes | −1,225 | $18.18 | $22K | 171,554 |
| 2026-03-15 | PETERS WILLIAM J CFO, EVP & TREASURER | Shares withheld for taxes | −1,973 | $18.18 | $36K | 175,063 |
| 2026-03-15 | Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | Shares withheld for taxes | −9,784 | $18.18 | $178K | 2,990,052 |
| 2026-03-15 | Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | Shares withheld for taxes | −2,908 | $18.18 | $53K | 1,245,125 |
| 2026-03-10 | Liawatidewi Yakob EVP CORP ADMIN CENTER | Shares withheld for taxes | −1,870 | $18.91 | $35K | 122,925 |
| 2026-03-10 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | Shares withheld for taxes | −2,215 | $18.91 | $42K | 172,779 |
| 2026-03-10 | PETERS WILLIAM J CFO, EVP & TREASURER | Shares withheld for taxes | −3,297 | $18.91 | $62K | 177,036 |
| 2026-03-10 | Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | Shares withheld for taxes | −14,785 | $18.91 | $280K | 2,999,836 |
| 2026-03-10 | Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | Shares withheld for taxes | −4,395 | $18.91 | $83K | 1,248,033 |
Page 2 of 81 · 1,602 trades