This cluster is routine and non-informative. The CFO's sale is tied to option exercise, not a bearish view. No follow-up action warranted — monitor next 10-Q for fundamental trends rather than insider activity.
Price Chart
Executive Summary
Two Amphastar insiders — Director Richard Prins and CFO William Peters — sold a combined $346K in open-market shares over a 7-day window. The CFO's sale coincided with the exercise of stock options, a routine pattern that reduces the informational signal. At $869M market cap, the $346K represents ~0.04% of equity — well below the 0.1% threshold for materiality. The cluster is a routine liquidity event, not a bearish signal.
Key Financial Metrics
Key Facts
- Two insiders sold a combined $346K in open-market shares over 7 days (Aug 4–11, 2026)
- CFO William Peters sold $184K while simultaneously exercising options for $100K — a standard cashless exercise pattern
- Director Richard Prins sold $162K on Aug 11 at $20.30/share
- Total sales represent ~0.04% of Amphastar's $869M market cap — trivial
- No insider purchases occurred in the cluster
Financial Impact
$346K total insider sales, ~0.04% of market cap
Risk Factors
- Insider sales could accelerate if stock price weakens further (currently ~$20, near 52-week lows)
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-AMPH-1786572926541 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 23, 2026 4w ago | Insider Cluster | $26.27 | awaiting T+60 | — | $25.57 (−2.66%) |
Sep 21, 2026 5w ago | 144 | $24.32 | awaiting T+60 | — | $25.57 (+5.14%) |
Aug 21, 2026 9w ago | Institutional Cluster | $21.60 | awaiting T+60 | — | $25.57 (+18.38%) |
Aug 12, 2026 10w ago | Insider Cluster | $20.18 | awaiting T+60 | — | $25.57 (+26.71%) |
Aug 11, 2026 11w ago | 144 | $20.31 | awaiting T+60 | — | $25.57 (+25.90%) |
Jul 13, 2026 15w ago | 8-K | $19.29 $25.91 | ▲ +34.32% | ▲ +30.32% | $25.57 (+32.56%) |
Jul 7, 2026 15w ago | 8-K | $18.88 $25.35 | ▼ −34.27% | ▼ −31.78% | $25.57 (−35.43%) |
Apr 13, 2026 28w ago | DEFA14A | $21.38 $19.02 | ▼ −11.04% | ▼ −19.56% | $25.57 (+19.60%) |
US Market Status
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