Amphastar Pharmaceuticals, Inc. insider trading
This tab shows only the shares insiders bought or sold on the open market in the last twelve months (Form 4 codes P and S). Grants, option exercises, shares held back for tax and gifts are left out on purpose, so what is left is insiders trading at the market price like anyone else.
In the last twelve months insiders at Amphastar Pharmaceuticals, Inc. filed 11 open-market sales worth $1.7 million and 0 open-market purchases, on Form 4 with the SEC. The latest: Peters William J, CFO, EVP & Treasurer, sold 4,139 shares at $25.00 on 21 September 2026, filed 23 September 2026.
| Traded | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 21 September 2026 | Peters William J | CFO, EVP & Treasurer | Sale | 4,139 | $25.00 | $103,475 | Form 4 |
| 16 September 2026 | Zhou Rong | Senior EVP, Production Center | Sale | 10,000 | $23.94 | $239,404 | Form 4 |
| 2 September 2026 | Zhou Rong | Senior EVP, Production Center | Sale | 3,187 | $23.63 | $75,306 | Form 4 |
| 11 August 2026 | Prins Richard K | Director | Sale | 7,973 | $20.30 | $161,852 | Form 4 |
| 7 August 2026 | Peters William J | CFO, EVP & Treasurer | Sale | 8,180 | $22.48 | $183,886 | Form 4 |
| 17 December 2025 | Zhou Rong | Senior EVP, Production Center | Sale | 9,787 | $26.20 | $256,379 | Form 4 |
| 12 December 2025 | Petersen Floyd F. | Director | Sale | 2,426 | $25.92 | $62,888 | Form 4 |
| 11 December 2025 | Petersen Floyd F. | Director | Sale | 1,737 | $25.69 | $44,620 | Form 4 |
| 25 November 2025 | Prins Richard K | Director | Sale | 4,179 | $27.10 | $113,253 | Form 4 |
| 13 November 2025 | Petersen Floyd F. | Director | Sale | 16,679 | $26.49 | $441,837 | Form 4 |
| 3 November 2025 | Petersen Floyd F. | Director | Sale | 500 | $25.27 | $12,633 | Form 4 |
A filing with several lines appears once per line.
Source
Form 4 filings on EDGAR for Amphastar Pharmaceuticals, Inc.: the company's filing index.
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