The small size and lack of C-suite urgency (only two insiders, no CEO/COO selling) suggest routine portfolio diversification. Monitor next insider filing for any acceleration in selling volume or pattern change.
Price Chart
Executive Summary
Two Amphastar insiders, including the CFO and a senior EVP, sold a combined $343K in open-market sales over a one-week window. The CFO's sale of $103K and the senior EVP's sale of $239K represent routine, modest dispositions relative to the company's market cap, and no 10b5-1 plan indication is present. The cluster is small in dollar value and involves only two insiders, suggesting liquidity-driven selling rather than a material negative signal.
Key Financial Metrics
Key Facts
- CFO William J. Peters sold 4.1K shares for $103K on 2026-09-21.
- Senior EVP Rong Zhou sold 10.0K shares for $239K on 2026-09-16.
- Total insider sales of $343K represent less than 0.1% of Amphastar's market cap.
- No open-market purchases were reported in the cluster.
- Sales are not clustered with any material corporate event (e.g., earnings, guidance, M&A) in the filing window.
Financial Impact
Total insider sales of $343K, a trivial amount relative to the company's market capitalization.
Risk Factors
- If insider selling accelerates in subsequent weeks without a 10b5-1 plan, it could signal growing bearish conviction among management.
- No offsetting insider buying to provide a bullish counter-signal.
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-AMPH-1790201007723 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 23, 2026 4w ago | Insider Cluster | $26.27 | awaiting T+60 | — | $25.47 (−3.05%) |
Sep 21, 2026 5w ago | 144 | $24.32 | awaiting T+60 | — | $25.47 (+4.73%) |
Aug 21, 2026 9w ago | Institutional Cluster | $21.60 | awaiting T+60 | — | $25.47 (+17.92%) |
Aug 12, 2026 10w ago | Insider Cluster | $20.18 | awaiting T+60 | — | $25.47 (+26.21%) |
Aug 11, 2026 10w ago | 144 | $20.31 | awaiting T+60 | — | $25.47 (+25.41%) |
Jul 13, 2026 15w ago | 8-K | $19.29 $25.91 | ▲ +34.32% | ▲ +30.32% | $25.47 (+32.04%) |
Jul 7, 2026 15w ago | 8-K | $18.88 $25.35 | ▼ −34.27% | ▼ −31.78% | $25.47 (−34.90%) |
Apr 13, 2026 28w ago | DEFA14A | $21.38 $19.02 | ▼ −11.04% | ▼ −19.56% | $25.47 (+19.13%) |
US Market Status
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