This is a routine insider sale by a director, likely for personal liquidity or tax planning. The small size relative to market cap and the fact that shares originated from RSU vesting suggest no negative signal. Monitor for any follow-on Form 4 filings to confirm the sale was executed, but no immediate trading action is warranted.
Price Chart
Executive Summary
Director Richard Prins filed a Form 144 notice of intent to sell 7,973 shares of Amphastar Pharmaceuticals common stock, with an estimated aggregate market value of approximately $161,932. The shares were acquired through RSU vesting events between 2017 and 2025. This is a relatively small sale relative to the company's $864M market cap and the director's likely total holdings, and the filing does not indicate any material change in the company's outlook.
Key Facts
- Director Richard K. Prins filed Form 144 to sell 7,973 shares of common stock.
- Estimated aggregate market value of the proposed sale is approximately $161,932.
- Shares were acquired through RSU vesting events from 2017 to 2025.
- The sale represents a small fraction of the company's $864M market capitalization.
- The filing is an advance notice of intent to sell; the actual sale may not occur.
Financial Impact
Proposed sale of 7,973 shares valued at approximately $161,932, representing about 0.019% of the company's $864M market cap.
Risk Factors
- Insider sale could be perceived negatively by the market if it precedes negative news, though the small size mitigates this risk.
- The sale is not yet executed; the insider may choose not to sell.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001969223-26-000880 |
| Document: 0001969223-26-000880-index.html | 0001969223-26-000880 |
| Document: 0001969223-26-000880.txt | 0001969223-26-000880 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 23, 2026 4w ago | Insider Cluster | $26.27 | awaiting T+60 | — | $25.32 (−3.62%) |
Sep 21, 2026 4w ago | 144 | $24.32 | awaiting T+60 | — | $25.32 (+4.11%) |
Aug 21, 2026 9w ago | Institutional Cluster | $21.60 | awaiting T+60 | — | $25.32 (+17.22%) |
Aug 12, 2026 10w ago | Insider Cluster | $20.18 | awaiting T+60 | — | $25.32 (+25.47%) |
Aug 11, 2026 10w ago | 144 | $20.31 | awaiting T+60 | — | $25.32 (+24.67%) |
Jul 13, 2026 15w ago | 8-K | $19.29 $25.91 | ▲ +34.32% | ▲ +30.32% | $25.32 (+31.26%) |
Jul 7, 2026 15w ago | 8-K | $18.88 $25.35 | ▼ −34.27% | ▼ −31.78% | $25.32 (−34.11%) |
Apr 13, 2026 27w ago | DEFA14A | $21.38 $19.02 | ▼ −11.04% | ▼ −19.56% | $25.32 (+18.43%) |
US Market Status
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