AMPHASTAR PHARMACEUTICALS INC (AMPH) — insider trading
Health Care · NASDAQ
AMPHASTAR PHARMACEUTICALS INC (AMPH) has 36 reported SEC Form 4 insider transactions in our data, including 5 open-market sales among the most recent 36 (latest 2026-09-21).
Recent Form 4 transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-21 | PETERS WILLIAM J | Director, Officer (CFO, EVP & TREASURER) | Open-market sale | 4,139 | $25.00 | $103.5K | Form 4 |
| 2026-09-16 | Zhou Rong | Officer (SENIOR EVP, PRODUCTION CENTER) | Option exercise / conversion (derivative) | 10,000 | — | $0 | Form 4 |
| 2026-09-16 | Zhou Rong | Officer (SENIOR EVP, PRODUCTION CENTER) | Open-market sale | 10,000 | $23.94 | $239.4K | Form 4 |
| 2026-09-16 | Zhou Rong | Officer (SENIOR EVP, PRODUCTION CENTER) | Option exercise / conversion | 10,000 | $13.35 | $133.5K | Form 4 |
| 2026-09-02 | Zhou Rong | Officer (SENIOR EVP, PRODUCTION CENTER) | Open-market sale | 3,187 | $23.63 | $75.3K | Form 4 |
| 2026-08-11 | PRINS RICHARD K | Director | Open-market sale | 7,973 | $20.30 | $161.9K | Form 4 |
| 2026-08-07 | PETERS WILLIAM J | Director, Officer (CFO, EVP & TREASURER) | Option exercise / conversion (derivative) | 5,053 | — | $0 | Form 4 |
| 2026-08-07 | PETERS WILLIAM J | Director, Officer (CFO, EVP & TREASURER) | Open-market sale | 8,180 | $22.48 | $183.9K | Form 4 |
| 2026-08-07 | PETERS WILLIAM J | Director, Officer (CFO, EVP & TREASURER) | Option exercise / conversion | 5,053 | $19.79 | $100.0K | Form 4 |
| 2026-07-09 | Pierce Anthony T | Director | Grant / award / vesting (derivative) | 16,646 | — | $0 | Form 4 |
| 2026-07-09 | Pierce Anthony T | Director | Grant / award / vesting | 7,886 | — | $0 | Form 4 |
| 2026-06-02 | Lee Howard | Director | Shares withheld for taxes / exercise cost | 769 | $18.45 | $14.2K | Form 4 |
| 2026-06-01 | Deflin Gayle | Director | Grant / award / vesting (derivative) | 17,365 | — | $0 | Form 4 |
| 2026-06-01 | Deflin Gayle | Director | Grant / award / vesting | 8,143 | — | $0 | Form 4 |
| 2026-06-01 | Gaugh David Russell | Director | Grant / award / vesting (derivative) | 17,365 | — | $0 | Form 4 |
| 2026-06-01 | Gaugh David Russell | Director | Grant / award / vesting | 8,143 | — | $0 | Form 4 |
| 2026-06-01 | Gerst Diane G. | Director | Grant / award / vesting (derivative) | 17,365 | — | $0 | Form 4 |
| 2026-06-01 | Gerst Diane G. | Director | Grant / award / vesting | 8,143 | — | $0 | Form 4 |
| 2026-06-01 | ZASLOFF MICHAEL A | Director | Grant / award / vesting (derivative) | 17,365 | — | $0 | Form 4 |
| 2026-06-01 | ZASLOFF MICHAEL A | Director | Grant / award / vesting | 8,143 | — | $0 | Form 4 |
| 2026-06-01 | Lee Howard | Director | Grant / award / vesting (derivative) | 17,365 | — | $0 | Form 4 |
| 2026-06-01 | Lee Howard | Director | Grant / award / vesting | 8,143 | — | $0 | Form 4 |
| 2026-06-01 | PRINS RICHARD K | Director | Grant / award / vesting (derivative) | 17,365 | — | $0 | Form 4 |
| 2026-06-01 | PRINS RICHARD K | Director | Grant / award / vesting | 8,143 | — | $0 | Form 4 |
| 2026-03-15 | Zhang Jack Y.; Luo Mary Z. | Director, Officer (CEO & CHIEF SCIENTIFIC OFFICER), 10% owner | Shares withheld for taxes / exercise cost | 2,908 | $18.18 | $52.9K | Form 4 |
| 2026-03-15 | Zhang Jack Y.; Luo Mary Z. | Director, Officer (CEO & CHIEF SCIENTIFIC OFFICER), 10% owner | Shares withheld for taxes / exercise cost | 9,784 | $18.18 | $177.9K | Form 4 |
| 2026-03-15 | PETERS WILLIAM J | Director, Officer (CFO, EVP & TREASURER) | Shares withheld for taxes / exercise cost | 1,973 | $18.18 | $35.9K | Form 4 |
| 2026-03-15 | Zhou Rong | Officer (SENIOR EVP, PRODUCTION CENTER) | Shares withheld for taxes / exercise cost | 1,225 | $18.18 | $22.3K | Form 4 |
| 2026-03-15 | Liawatidewi Yakob | Director, Officer (EVP CORP ADMIN CENTER) | Shares withheld for taxes / exercise cost | 1,033 | $18.18 | $18.8K | Form 4 |
| 2026-03-10 | Zhou Rong | Officer (SENIOR EVP, PRODUCTION CENTER) | Shares withheld for taxes / exercise cost | 2,215 | $18.91 | $41.9K | Form 4 |
| 2026-03-10 | PETERS WILLIAM J | Director, Officer (CFO, EVP & TREASURER) | Shares withheld for taxes / exercise cost | 3,297 | $18.91 | $62.3K | Form 4 |
| 2026-03-09 | Zhou Rong | Officer (SENIOR EVP, PRODUCTION CENTER) | Grant / award / vesting (derivative) | 81,341 | — | $0 | Form 4 |
| 2026-03-09 | Zhou Rong | Officer (SENIOR EVP, PRODUCTION CENTER) | Grant / award / vesting | 39,432 | — | $0 | Form 4 |
| 2026-03-09 | PETERS WILLIAM J | Director, Officer (CFO, EVP & TREASURER) | Grant / award / vesting (derivative) | 121,071 | — | $0 | Form 4 |
| 2026-03-09 | PETERS WILLIAM J | Director, Officer (CFO, EVP & TREASURER) | Grant / award / vesting | 58,693 | — | $0 | Form 4 |
| 2024-08-19 | PRINS RICHARD K | Director | Bona fide gift | 1,500 | — | $0 | Form 4 |
Ask the chat about AMPH's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: AMPHASTAR PHARMACEUTICALS INC (AMPH).
Last updated 2026-09-21 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.