The simultaneous open-market selling by the entire C-suite is a rare pattern that often precedes negative catalysts. Monitor for any upcoming earnings pre-announcement, guidance revision, or material event in the next 30 days. The lack of 10b5-1 plan disclosures increases the signal value.
Price Chart
Executive Summary
Four top insiders at Ambarella, including the CEO and CFO, collectively sold ~$915K worth of stock in open-market transactions on September 17-18, 2026. The cluster involves the entire C-suite (CEO, CFO, COO) and a senior VP, all selling on the same day, which is an unusually coordinated signal. While the absolute dollar value is modest relative to Ambarella's market cap (~$2.6B), the unanimity and seniority of the sellers warrant attention.
Key Financial Metrics
Key Facts
- CEO Wang Feng-Ming sold 6,086 shares for ~$395K on 2026-09-17
- CFO Young John Alexander sold 3,126 shares for ~$203K on 2026-09-17
- COO Lee Chan W sold 2,893 shares for ~$188K on 2026-09-17
- Senior VP Ju Chi-Hong sold 2,009 shares for ~$130K on 2026-09-17
- All four sales were open-market (code S) with no 10b5-1 plan indication
- Total cluster value: ~$915K, approximately 0.04% of market cap
Financial Impact
~$915K in insider sales, ~0.04% of market cap
Risk Factors
- Potential undisclosed negative business development (demand, margin, or customer loss)
- Possible upcoming earnings miss or guidance downgrade
- Insiders may be diversifying for personal reasons, but the coordination is unusual
Investment Themes
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-AMBA-1790027888479 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 28, 2026 29d ago | Insider Cluster | $68.73 | awaiting T+20 | — | $66.82 (−2.78%) |
Sep 25, 2026 4w ago | 144 | $72.68 $66.50 | ▼ −8.50% | ▼ −7.03% | $66.82 (−8.06%) |
Sep 21, 2026 5w ago | Insider Cluster | $67.06 $63.22 | ▲ +5.73% | ▲ +5.17% | $66.82 (+0.36%) |
Sep 18, 2026 5w ago | Insider Cluster | $68.85 $62.76 | ▲ +8.85% | ▲ +7.94% | $66.82 (+2.95%) |
Aug 11, 2026 10w ago | Press Release | $83.53 | awaiting T+20 | — | $66.82 (−20.00%) |
Jul 2, 2026 16w ago | Insider Cluster | $79.73 $82.68 | ▲ +3.70% | ▲ +2.85% | $66.82 (−16.19%) |
May 28, 2026 21w ago | Insider Cluster | $72.18 $67.01 | ▼ −7.16% | ▼ −5.37% | $66.82 (−7.43%) |
May 28, 2026 21w ago | 8-K | $72.18 $67.01 | ▼ −7.16% | ▼ −5.37% | $66.82 (−7.43%) |
May 15, 2026 23w ago | DEFA14A | $78.88 $67.12 | ▼ −14.91% | ▼ −16.49% | $66.82 (−15.29%) |
May 4, 2026 25w ago | Press Release | $70.72 | awaiting T+20 | — | $66.82 (−5.51%) |
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.
Create a free account Live analysis, Telegram alerts, watchlists and the MCP server for subscribers