The President/COO's sales following derivative exercises suggest liquidity-driven selling, but the lack of a 10b5-1 plan and the cluster with the CEO's sale warrant monitoring for upcoming earnings or material news. Watch for any 8-K or press release in the next 2 weeks that could explain the selling.
Price Chart
Executive Summary
President and COO Chen Sean Chihhsiang sold $772K of AMBQ stock on October 14, 2026, following derivative exercises, while CEO Esaka Fumihide sold $25K on October 15. The cluster totals $797K in open-market sales, representing approximately 0.24% of market cap ($326M), which is modest. The cluster is notable but not alarming.
Key Financial Metrics
Key Facts
- President and COO Chen Sean Chihhsiang sold 14,000 shares in open-market transactions on October 14, 2026, totaling $772,438.
- Chen exercised 15,000 derivative shares at $8.12 ($121,800) and 15,000 shares at $0 (non-cash) on the same day.
- CEO Esaka Fumihide sold 500 shares at $49.13 on October 15, 2026, for $24,565.
- Total open-market sales in the cluster: $797,003.
- Market cap is approximately $326M, making the cluster ~0.24% of market cap.
- No 10b5-1 plan indication was provided for any of the sales.
Financial Impact
Total insider sales of $797K represent 0.24% of market cap ($326M).
Risk Factors
- Insider selling cluster without plan disclosure may signal management's lack of confidence in near-term prospects.
- Historical bullish calls on AMBQ have underperformed, indicating potential downside risk.
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-AMBQ-1792184015007 |
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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