AMBA insider buying and SEC filings, explained
Ambarella Inc. · CIK 1280263
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$6.9M
Planned sales (10b5-1)
$8.1M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Sep 25, 2026 | Planned (10b5-1) | Christopher B. Paisley (Director) sold 250 shares at $70.76 ($18K), marked as a 10b5-1 plan trade. Holdings down 1% to 43,930 shares. | SEC filing Filed Sep 28, 2026 |
| Sep 18, 2026 | Planned (10b5-1) | John Alexander Young (CFO) sold 1,896 shares at $67.28 ($128K), marked as a 10b5-1 plan trade. Holdings down 2% to 107,806 shares. | SEC filing Filed Sep 21, 2026 |
| Sep 17, 2026 | Sale | Feng-Ming Wang (CEO and Director) sold 6,086 shares at $64.83 ($395K). Holdings down 1% to 767,759 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 18, 2026 |
| Sep 17, 2026 | Sale | Chi-Hong Ju (Senior VP, Systems & GM) sold 2,009 shares at $64.83 ($130K). Holdings down 1% to 154,153 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 18, 2026 |
| Sep 17, 2026 | Sale | Chan W Lee (Chief Operations Officer) sold 2,893 shares at $64.83 ($188K). Holdings down 2% to 154,443 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 18, 2026 |
| Sep 17, 2026 | Sale | John Alexander Young (CFO) sold 3,126 shares at $64.83 ($203K). Holdings down 3% to 109,702 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 18, 2026 |
| Jul 9, 2026 | Sale | Yun-Lung Chen (VP, Business Dev. & Marketing) sold 5,958 shares at $78.66 ($469K). Holdings down 9% to 60,557 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 10, 2026 |
| Jul 1, 2026 | Sale | Chi-Hong Ju (Senior VP, Systems & GM) sold 10,000 shares at about $88.84 ($888K). Holdings down 6% to 155,924 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 2, 2026 |
| Jul 1, 2026 | Planned (10b5-1) | Feng-Ming Wang (CEO and Director) sold 16,250 shares at about $90.08 ($1.5M), marked as a 10b5-1 plan trade. Holdings down 2% to 773,607 shares. | SEC filing Filed Jul 2, 2026 |
| Jun 26, 2026 | Planned (10b5-1) | Christopher B. Paisley (Director) sold 250 shares at $62.01 ($16K), marked as a 10b5-1 plan trade. Holdings down 1% to 41,029 shares. | SEC filing Filed Jun 30, 2026 |
| Jun 17, 2026 | Planned (10b5-1) | John Alexander Young (CFO) sold 5,033 shares at about $67.54 ($340K), marked as a 10b5-1 plan trade. Holdings down 4% to 112,590 shares. | SEC filing Filed Jun 18, 2026 |
| Jun 17, 2026 | Sale | Chan W Lee (Chief Operations Officer) sold 2,951 shares at $67.87 ($200K). Holdings down 2% to 157,098 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 18, 2026 |
| Jun 17, 2026 | Sale | Chi-Hong Ju (Senior VP, Systems & GM) sold 2,017 shares at $67.87 ($137K). Holdings down 1% to 165,924 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 18, 2026 |
| Jun 17, 2026 | Sale | Feng-Ming Wang (CEO and Director) sold 6,204 shares at $67.87 ($421K). Holdings down 1% to 799,857 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 18, 2026 |
| Jun 12, 2026 | Sale | Yun-Lung Chen (VP, Business Development and) sold 9,856 shares at about $67.06 ($661K). Holdings down 13% to 66,515 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 16, 2026 |
| May 26, 2026 | Planned (10b5-1) | John Alexander Young (CFO) sold 400 shares at $96.00 ($38K), marked as a 10b5-1 plan trade. Holdings down <1% to 117,623 shares. | SEC filing Filed May 28, 2026 |
| May 26, 2026 | Planned (10b5-1) | Feng-Ming Wang (CEO and Director) sold 32,500 shares at about $91.01 ($3.0M), marked as a 10b5-1 plan trade. Holdings down 4% to 806,061 shares. | SEC filing Filed May 28, 2026 |
| Apr 21, 2026 | Planned (10b5-1) | John Alexander Young (CFO) sold 1,971 shares at $60.00 ($118K), marked as a 10b5-1 plan trade. Holdings down 2% to 117,623 shares. | SEC filing Filed Apr 22, 2026 |
| Mar 17–19, 2026 | Sale | John Alexander Young (CFO) sold 7,615 shares between Mar 17 and Mar 19 at about $53.32 ($406K). Holdings down 6% to 119,594 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 19, 2026 |
| Mar 19, 2026 | Sale | Chan W Lee (Chief Operations Officer) sold 3,641 shares at $54.14 ($197K). Holdings down 2% to 160,049 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 19, 2026 |
| Mar 19, 2026 | Sale | Chi-Hong Ju (Senior VP, Systems & GM, Asia) sold 2,155 shares at $54.14 ($117K). Holdings down 1% to 167,941 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 19, 2026 |
| Mar 19, 2026 | Sale | Feng-Ming Wang (CEO and Director) sold 8,083 shares at $54.14 ($438K). Holdings down 1% to 838,561 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 19, 2026 |
| Mar 2, 2026 | Planned (10b5-1) | Feng-Ming Wang (CEO and Director) sold 50,000 shares at about $60.80 ($3.0M), marked as a 10b5-1 plan trade. Holdings down 6% to 768,979 shares. | SEC filing Filed Mar 4, 2026 |
| Dec 30, 2025 | Sale Amended filing | Chi-Hong Ju (Senior VP, Systems & GM, Asia) sold 7,945 shares at about $70.25 ($558K). Holdings down 5% to 149,587 shares. Not marked as a 10b5-1 plan trade. This amends an earlier filing that is not in our records. | SEC filing Filed Jan 23, 2026 |
| Jan 5, 2026 | Sale | Chi-Hong Ju (Senior VP, Systems & GM, Asia) sold 7,728 shares at about $75.58 ($584K). Holdings down 5% to 146,039 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jan 7, 2026 |
| Dec 30, 2025 | Sale | Chi-Hong Ju (Senior VP, Systems & GM, Asia) sold 3,765 shares at about $70.32 ($265K). Holdings down 2% to 153,767 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 31, 2025 |
| Dec 26, 2025 | Sale | Christopher B. Paisley (Director) sold 500 shares at $72.18 ($36K). Holdings down 1% to 41,279 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 29, 2025 |
| Dec 17–18, 2025 | Sale | John Alexander Young (CFO) sold 6,370 shares between Dec 17, 2025 and Dec 18, 2025 at about $72.50 ($462K). Holdings down 6% to 102,738 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 19, 2025 |
| Dec 17, 2025 | Sale | Chan W Lee (Chief Operations Officer) sold 2,406 shares at $71.82 ($173K). Holdings down 2% to 124,566 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 19, 2025 |
| Dec 17, 2025 | Sale | Chi-Hong Ju (Senior VP, Systems & GM, Asia) sold 1,342 shares at $71.82 ($96K). Holdings down 1% to 157,532 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 19, 2025 |
| Dec 17, 2025 | Sale | Feng-Ming Wang (CEO and Director) sold 4,950 shares at $71.82 ($356K). Holdings down 1% to 783,979 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 19, 2025 |
| Dec 16, 2025 | Sale | Elizabeth M Schwarting (Director) sold 624 shares at $72.38 ($45K). Holdings down 9% to 6,690 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 18, 2025 |
25 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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