This insider cluster is too small in dollar terms to warrant a bearish read-through. The CFO's sales follow derivative exercises and are likely liquidity-driven. Monitor for any larger insider sales or a change in pattern, but no immediate action is needed.
Price Chart
Executive Summary
Two ACMR insiders sold a combined $1.32M in open-market sales over a 7-day window, with CFO Mark McKechnie accounting for $1.04M of that total. The sales follow derivative exercises and represent 0.024% of the $5.5B market cap, falling well below the 0.1% materiality threshold. While the cluster includes a C-suite executive, the dollar amount is trivial relative to company size and the sales are likely liquidity-driven following option exercises, not a bearish signal.
Key Financial Metrics
Key Facts
- CFO Mark McKechnie sold $1.04M worth of shares on 2026-08-20 at prices between $76.34 and $77.89
- Director Haiping Dun sold $276K worth of shares on 2026-08-18 at prices between $80.29 and $82.17
- Total open-market sales of $1.32M represent only 0.024% of ACMR's $5.5B market cap
- Both insiders also exercised derivatives (non-cash or at low strike prices) on the same days as their sales
- The cluster is small in dollar terms and consistent with routine option-exercise-and-sell patterns
Financial Impact
Total insider sales of $1.32M, or 0.024% of market cap — immaterial
Risk Factors
- If a larger insider selling pattern emerges in coming weeks, it could signal management's view of overvaluation
- The stock is up significantly (historical T+20 alpha of +17.48% on prior reports), so some profit-taking by insiders is natural
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-ACMR-1787362255804 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Aug 22, 2026 5w ago | Insider Cluster | $77.35 $75.80 | ▼ −2.00% | ▼ −3.30% | $83.09 (+7.43%) |
Aug 8, 2026 7w ago | Institutional Cluster | $79.41 $77.20 | ▼ −2.78% | ▼ −1.87% | $83.09 (+4.63%) |
Aug 7, 2026 8w ago | 8-K | $83.80 $74.44 | ▼ −11.17% | ▼ −10.77% | $83.09 (−0.85%) |
Jul 18, 2026 10w ago | Institutional Cluster | $82.52 $85.64 | ▲ +3.78% | ▼ −0.34% | $83.09 (+0.69%) |
Jun 11, 2026 16w ago | Institutional Cluster | $91.70 $106.04 | ▲ +15.64% | ▲ +13.75% | $83.09 (−9.39%) |
Jun 6, 2026 16w ago | Insider Cluster | $80.57 $98.52 | ▲ +22.28% | ▲ +20.65% | $83.09 (+3.13%) |
May 29, 2026 17w ago | 8-K | $82.05 $126.89 | ▲ +54.65% | ▲ +55.95% | $83.09 (+1.27%) |
May 22, 2026 19w ago | 8-K | $73.35 $95.80 | ▲ +30.61% | ▲ +32.02% | $83.09 (+13.28%) |
May 15, 2026 19w ago | 8-K | $63.25 $91.18 | ▲ +44.16% | ▲ +42.58% | $83.09 (+31.37%) |
May 12, 2026 20w ago | 424B5 | $64.75 $91.70 | ▼ −41.62% | ▼ −42.23% | $83.09 (−28.32%) |
US Market Status
Subscribe to SecBot
Get Real-Time SEC Filing Intelligence
Comprehensive SEC filing analysis delivered the moment filings hit EDGAR. Sentiment scoring, impact analysis, and actionable insights for every material event.
Try SecBot Free Coming soon: SecBot Pro with alerts, watchlists, and API access