The concentrated selling by the CEO and President/COO, especially after option exercises, warrants monitoring for any upcoming negative news or guidance changes. Watch for the next 8-K or earnings release for context on the selling.
Price Chart
Executive Summary
A cluster of insider selling at Ambiq Micro over the past week, led by the CEO and President/COO, totaled $334K in open-market sales. While the dollar amount is modest relative to the company's market cap, the involvement of top executives exercising and immediately selling shares signals potential caution.
Key Financial Metrics
Key Facts
- CEO Esaka Fumihide sold shares on three separate days (Sep 11, 14, 15) totaling ~$3.98M in open-market sales, with concurrent option exercises.
- President/COO Chen Sean Chihhsiang sold ~$902K in open-market shares on Sep 14, also following option exercises.
- Director ZHANG KER sold ~$634K in open-market shares on Sep 11.
- CTO Hanson Scott McLean sold ~$116K in open-market shares on Sep 15.
- Total open-market selling by all insiders in the cluster is approximately $5.6M, though the DOCUMENT 1 cluster data reports only $334K (likely a subset or different window).
- The cluster includes multiple option exercises (non-cash) followed by immediate sales, a pattern often associated with liquidity or tax planning rather than pure information-based selling.
Financial Impact
Total insider open-market selling of approximately $5.6M over the cluster window, representing roughly 1.7% of the company's $326M market cap.
Risk Factors
- Insider selling may indicate management's lack of confidence in near-term prospects.
- The pattern of option exercises and immediate sales could signal upcoming dilution or a desire to lock in gains before a potential decline.
- Historical poor performance of bullish calls on AMBQ suggests the stock may continue to face downward pressure.
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-AMBQ-1789709052771 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 16, 2026 10d ago | Insider Cluster | $49.62 | awaiting T+20 | — | $51.06 (−2.90%) |
Sep 17, 2026 5w ago | Insider Cluster | $65.46 $49.88 | ▲ +23.80% | ▲ +24.01% | $51.06 (+22.00%) |
Sep 15, 2026 5w ago | Insider Cluster | $59.90 $51.55 | ▲ +13.94% | ▲ +16.00% | $51.06 (+14.76%) |
Sep 9, 2026 6w ago | Insider Cluster | $60.66 $58.90 | ▼ −2.90% | ▼ −5.28% | $51.06 (−15.83%) |
Sep 2, 2026 7w ago | Insider Cluster | $56.43 $68.18 | ▲ +20.82% | ▲ +22.01% | $51.06 (−9.52%) |
Aug 18, 2026 9w ago | Insider Cluster | $59.19 $62.35 | ▲ +5.34% | ▲ +6.18% | $51.06 (−13.74%) |
Aug 15, 2026 10w ago | Institutional Cluster | $67.86 $60.85 | ▼ −10.33% | ▼ −8.35% | $51.06 (−24.76%) |
Aug 11, 2026 10w ago | 8-K | $65.29 $63.77 | ▼ −2.33% | ▼ −1.27% | $51.06 (−21.80%) |
Jul 30, 2026 12w ago | 8-K | $63.23 $60.09 | ▼ −4.97% | ▼ −8.93% | $51.06 (−19.25%) |
Jun 24, 2026 17w ago | EFFECT | $81.18 $77.55 | ▼ −4.47% | ▼ −6.40% | $51.06 (−37.10%) |
US Market Status
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