🕵️ Ambarella Inc ($AMBA)
SEC insider & ownership activity, last 12 months · CIK 1280263 · every row links its SEC filing
Over the last 12 months insiders sold $18.7M with no open-market buying against it. Wang Feng-Ming sold $10.1M (Sep–Jul). No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 8 sellers, $18.7M (46 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Wang Feng-Ming | 0 | – | 14 | $10.1M | Jul 1, 2026 |
| Ju Chi-Hong | 0 | – | 10 | $3.6M | Jul 1, 2026 |
| Yun-Lung Chen | 0 | – | 3 | $1.8M | Jul 9, 2026 |
| John Young | 0 | – | 9 | $1.6M | Jun 17, 2026 |
| Chan W. Lee | 0 | – | 5 | $1.1M | Jun 17, 2026 |
| Elizabeth M Schwarting | 0 | – | 2 | $273K | Dec 16, 2025 |
| Leslie Kohn | 0 | – | 1 | $179K | Sep 17, 2025 |
| Christopher B. Paisley | 0 | – | 2 | $52K | Jun 26, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Vanguard Portfolio Management | 8.6% | 13G | Apr 28, 2026 | filing ↗ | |
| Blackrock, Inc. | 7.3% | 13G | Apr 23, 2025 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Yun-Lung Chen | $469K | Jul 9, 2026 | filing ↗ |
| Chihong John Ju | $888K | Jul 1, 2026 | filing ↗ |
| Feng-Ming Wang | $1.4M | Jul 1, 2026 | filing ↗ |
| Christopher B. Paisley | $16K | Jun 26, 2026 | filing ↗ |
| John Young | $124K | Jun 17, 2026 | filing ↗ |
| Yun-Lung Chen | $661K | Jun 12, 2026 | filing ↗ |
| Feng-Ming Wang | $2.8M | May 26, 2026 | filing ↗ |
| John Young | $35K | May 26, 2026 | filing ↗ |
| John Young | $117K | Apr 21, 2026 | filing ↗ |
| Feng-Ming Wang | $3.0M | Mar 2, 2026 | filing ↗ |
| Chihong John Ju | $584K | Jan 5, 2026 | filing ↗ |
| Chihong John Ju | $558K | Dec 30, 2025 | filing ↗ |
| Christopher B. Paisley | $36K | Dec 26, 2025 | filing ↗ |
| John A Young | $277K | Dec 18, 2025 | filing ↗ |
| Elizabeth M Schwarting | $45K | Dec 16, 2025 | filing ↗ |
| Leslie Kohn | $10.7M | Dec 2, 2025 | filing ↗ |
| Chihong John Ju | $498K | Oct 14, 2025 | filing ↗ |
| Chihong John Ju | $411K | Oct 13, 2025 | filing ↗ |
| Elizabeth M Schwarting | $227K | Oct 6, 2025 | filing ↗ |
| Christopher Day | $89K | Sep 22, 2025 | filing ↗ |
| Christopher Day | $84K | Sep 19, 2025 | filing ↗ |
| Christopher Day | $68K | Sep 18, 2025 | filing ↗ |
| Yun-Lung Chen | $717K | Sep 10, 2025 | filing ↗ |
| Christopher Day | $151K | Sep 8, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Officer/director changes (5.02) | Jun 26, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 26, 2026 | filing ↗ |
| Earnings (2.02) | May 28, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 28, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 23, 2026 | filing ↗ |
| Earnings (2.02) | Feb 23, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 23, 2026 | filing ↗ |
| Earnings (2.02) | Nov 24, 2025 | filing ↗ |
| Officer/director changes (5.02) | Nov 24, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 24, 2025 | filing ↗ |
| Earnings (2.02) | Aug 28, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 28, 2025 | filing ↗ |