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 |
|---|---|---|---|---|---|---|
| 2026-11-05 | PETERS WILLIAM J CFO, EVP & TREASURER | Option exercise 10b5-1 | +11,000 | $17.99 | $198K | 179,707 |
| 2026-11-05 | PETERS WILLIAM J CFO, EVP & TREASURER | Sale 10b5-1 | −12,631 | $28.99 | $366K | 167,076 |
| 2026-11-05 | PETERS WILLIAM J CFO, EVP & TREASURER | Option exercise · Employee Stock Option (right to buy) 10b5-1 | −11,000 | 67,833 | ||
| 2026-11-04 | PETERS WILLIAM J CFO, EVP & TREASURER | Option exercise 10b5-1 | +16,000 | $13.03 | $208K | 184,707 |
| 2026-11-04 | PETERS WILLIAM J CFO, EVP & TREASURER | Sale 10b5-1 | −16,000 | $28.03 | $448K | 168,707 |
| 2026-11-04 | PETERS WILLIAM J CFO, EVP & TREASURER | Option exercise · Employee Stock Option (right to buy) 10b5-1 | −16,000 | 7,674 | ||
| 2026-09-21 | PETERS WILLIAM J CFO, EVP & TREASURER | Sale 10b5-1 | −4,139 | $25.00 | $103K | 168,707 |
| 2026-09-16 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | Option exercise | +10,000 | $13.35 | $134K | 179,203 |
| 2026-09-16 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | Sale | −10,000 | $23.94 | $239K | 169,203 |
| 2026-09-16 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | Option exercise · Employee Stock Option (right to buy) | −10,000 | 19,424 | ||
| 2026-09-02 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | Sale | −3,187 | $23.63 | $75K | 169,203 |
| 2026-08-11 | PRINS RICHARD K Director | Sale | −7,973 | $20.30 | $162K | 29,625 |
| 2026-08-07 | PETERS WILLIAM J CFO, EVP & TREASURER | Option exercise 10b5-1 | +5,053 | $19.79 | $100K | 181,026 |
| 2026-08-07 | PETERS WILLIAM J CFO, EVP & TREASURER | Sale 10b5-1 | −8,180 | $22.48 | $184K | 172,846 |
| 2026-08-07 | PETERS WILLIAM J CFO, EVP & TREASURER | Option exercise · Employee Stock Option (right to buy) 10b5-1 | −5,053 | 0 | ||
| 2026-07-09 | Pierce Anthony T Director | Grant or award | +7,886 | 7,886 | ||
| 2026-07-09 | Pierce Anthony T Director | Grant or award · Stock Option (right to buy) | +16,646 | 16,646 | ||
| 2026-06-02 | Lee Howard Director | Shares withheld for taxes | −769 | $18.45 | $14K | 159,350 |
| 2026-06-01 | Gaugh David Russell Director | Grant or award | +8,143 | 14,447 | ||
| 2026-06-01 | Gaugh David Russell Director | Grant or award · Stock Option (right to buy) | +17,365 | 17,365 |
Page 1 of 81 · 1,602 trades