As of the latest Form 4 filed Jun 3, 2026.
What Amphastar P insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Newest filing first — the 34 most recent filings for AMPH.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-03 | 2026-06-02 | Lee Howard Director | FTax | −769.00 | $18.45 | $14.2K | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Gaugh David Russell Director | AAward | +8.14K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Deflin Gayle Director | AAward | +8.14K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Gerst Diane G. Director | AAward | +8.14K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | Lee Howard Director | AAward | +8.14K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | PRINS RICHARD K Director | AAward | +8.14K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-01 | ZASLOFF MICHAEL A Director | AAward | +8.14K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-03 | 2024-08-19 | PRINS RICHARD K Director | GGift | −1.50K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-17 | 2026-03-15 | Liawatidewi Yakob EVP CORP ADMIN CENTER | FTax | −1.03K | $18.18 | $18.8K | No | Form 4 ↗ |
| 2026-03-17 | 2026-03-15 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | FTax | −1.23K | $18.18 | $22.3K | No | Form 4 ↗ |
| 2026-03-17 | 2026-03-15 | PETERS WILLIAM J CFO, EVP & TREASURER | FTax | −1.97K | $18.18 | $35.9K | No | Form 4 ↗ |
| 2026-03-17 | 2026-03-15 | Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | FTax | −2.91K | $18.18 | $52.9K | No | Form 4 ↗ |
| 2026-03-17 | 2026-03-15 | Zhang Jack Y., CEO & CHIEF SCIENTIFIC OFFICER | FTax | −9.78K | $18.18 | $178K | No | Form 4 ↗ |
| 2026-03-11 | 2026-03-10 | Liawatidewi Yakob EVP CORP ADMIN CENTER | FTax | −1.87K | $18.91 | $35.4K | No | Form 4 ↗ |
| 2026-03-11 | 2026-03-10 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | FTax | −2.21K | $18.91 | $41.9K | No | Form 4 ↗ |
| 2026-03-11 | 2026-03-10 | PETERS WILLIAM J CFO, EVP & TREASURER | FTax | −3.30K | $18.91 | $62.3K | No | Form 4 ↗ |
| 2026-03-11 | 2026-03-10 | Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | FTax | −4.39K | $18.91 | $83.1K | No | Form 4 ↗ |
| 2026-03-11 | 2026-03-10 | Zhang Jack Y., CEO & CHIEF SCIENTIFIC OFFICER | FTax | −14.8K | $18.91 | $280K | No | Form 4 ↗ |
| 2026-03-11 | 2026-03-09 | Liawatidewi Yakob EVP CORP ADMIN CENTER | AAward | +35.5K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-11 | 2026-03-09 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | AAward | +39.4K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-11 | 2026-03-09 | PETERS WILLIAM J CFO, EVP & TREASURER | AAward | +58.7K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-11 | 2026-03-09 | Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | AAward | +72.5K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-11 | 2026-03-09 | Zhang Jack Y., CEO & CHIEF SCIENTIFIC OFFICER | AAward | +181K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-10 | 2026-03-06 | Liawatidewi Yakob EVP CORP ADMIN CENTER | FTax | −1.14K | $19.34 | $22.1K | No | Form 4 ↗ |
| 2026-03-10 | 2026-03-06 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | FTax | −1.36K | $19.34 | $26.2K | No | Form 4 ↗ |
| 2026-03-10 | 2026-03-06 | PETERS WILLIAM J CFO, EVP & TREASURER | FTax | −2.15K | $19.34 | $41.5K | No | Form 4 ↗ |
| 2026-03-10 | 2026-03-06 | Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | FTax | −3.08K | $19.34 | $59.5K | No | Form 4 ↗ |
| 2026-03-10 | 2026-03-06 | Zhang Jack Y., CEO & CHIEF SCIENTIFIC OFFICER | FTax | −7.77K | $19.34 | $150K | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Liawatidewi Yakob EVP CORP ADMIN CENTER | FTax | −965.00 | $19.96 | $19.3K | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Zhou Rong SENIOR EVP, PRODUCTION CENTER | FTax | −1.12K | $19.96 | $22.4K | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | PETERS WILLIAM J CFO, EVP & TREASURER | FTax | −1.74K | $19.96 | $34.8K | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER | FTax | −2.43K | $19.96 | $48.5K | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Zhang Jack Y., CEO & CHIEF SCIENTIFIC OFFICER | FTax | −5.77K | $19.96 | $115K | No | Form 4 ↗ |
| 2024-05-02 | 2024-05-01 | Petersen Floyd F. Director | SSale | −500.00 | $41.67 | $20.8K | Yes (planned) | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also AMPH’s full analysis or the market-wide insider trading feed. The tabs above jump to AMPH’s other SEC data.
Source: SEC Form 4 filings for AMPH, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
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