Beta48% was sold under disclosed trading plans, 31% to cover taxes, 21% with no plan disclosed. The largest seller, Feng-Ming Wang (CEO, Director), sold $10.1M. 21% of these sales were shares from exercising options.Share-of-stake figures for this company are being verified and will be added when that check is finished. Why
A share of stake is shown for 0 of the 7 officers and directors who sold. 14 are left out Disclosed company stock is not an insider's whole wealth.i
Left out: Leslie Kohn, Feng-Ming Wang, Chi-Hong Ju, Chan Lee, John Young, Yun-Lung Chen, Christopher Paisley, Hsiao-Wuen Hon, Chenming Hu, David Richardson, Christopher Day, Elizabeth Schwarting, Chantelle Breithaupt and Gregory Bryant (share of stake is being verified).
Officers and directors, past 12 months. Their share of stake is being verified and is not shown yet; amounts and trading plans are below.
Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Christopher Paisley Director | 250 | $70.76 | n/a | n/a | Sep 25, 2026 | Sep 28, 2026 |
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| John Young CFO | 1,896 | $67.28 | n/a | n/a | Sep 18, 2026 | Sep 21, 2026 |
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Feng-Ming Wang CEO, Director | 6,086 | $64.83 | n/a | n/a | Sep 17, 2026 | Sep 18, 2026 |
| John Young CFO | 3,126 | $64.83 | n/a | n/a | Sep 17, 2026 | Sep 18, 2026 |
| Chan Lee Chief Operations Officer | 2,893 | $64.83 | n/a | n/a | Sep 17, 2026 | Sep 18, 2026 |
| Chi-Hong Ju Senior VP, Systems & GM | 2,009 | $64.83 | n/a | n/a | Sep 17, 2026 | Sep 18, 2026 |
"% of total stake" is the shares in an event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings are not confirmed, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.
Chi-Hong Ju reported no open-market sales in the past 12 months. Large shareholders and the funds or companies that board members represent are not part of management, so they are left out of the figures above.
Yes. Feng-Ming Wang sold 143K shares ($10.1M) in the past 12 months, 74% of it under a trading plan disclosed in the filings.
Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 48% of sales by value ran under 10b5-1 trading plans disclosed in the filings, 31% were to cover taxes and 21% had no disclosed plan. A trading plan schedules sales in advance.
No. Officers and directors reported no purchases in the past 12 months.
| Who sold | Amount | % of holdings | Trading plan |
|---|---|---|---|
| Feng-Ming Wang CEO, Director | $10.1M 143K shares | Not confirmedshare of stake is being verified. Why | 74% under a disclosed plan, 26% to cover taxes |
| Chi-Hong Ju Senior VP, Systems & GM | $2.8M 38K shares | Not confirmedshare of stake is being verified. Why | 26% to cover taxes 74% no plan disclosed |
| John Young CFO | $1.7M 26K shares | Not confirmedshare of stake is being verified. Why | 37% under a disclosed plan, 47% to cover taxes 16% no plan disclosed |
| Yun-Lung Chen VP, Business Dev. & Marketing | $1.1M 16K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Chan Lee Chief Operations Officer | $1.1M 19K shares | Not confirmedshare of stake is being verified. Why | To cover taxes |
| Christopher Paisley Director | $69K 1K shares | Not confirmedshare of stake is being verified. Why | 48% under a disclosed plan 52% no plan disclosed |
| Elizabeth Schwarting Director | $45K 624 shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
Sold by a charitable foundation the insider reports: Foundation, reported by Chi-Hong Ju. A foundation's shares are not the insider's own stake, so they are left out of the figures above.
Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.
| Insider | Held Oct 16, 2025 | Sold | Held Oct 16, 2026 | Still held | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Leslie Kohn!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Leslie Kohn are complete. Chief Technology Officer, Director | n/a | 0 | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for Leslie KohnHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Leslie Kohn are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||
Feng-Ming Wang!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Feng-Ming Wang are complete. CEO, Director | n/a | −143K | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for Feng-Ming WangHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Feng-Ming Wang are complete; balances and unit counts will be added when the check is finished. −25Kgifted (net of own trusts) | ||||||||||||
Chi-Hong Ju!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Chi-Hong Ju are complete. Senior VP, Systems & GM | n/a | −38K | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for Chi-Hong JuHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Chi-Hong Ju are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||
Chan Lee!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Chan Lee are complete. Chief Operations Officer | n/a | −19K | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for Chan LeeHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Chan Lee are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||
John Young!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for John Young are complete. CFO | n/a | −26K | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for John YoungHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for John Young are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) Stock options (not counted as shares):
Estimate: options held × ($70.76 − strike price), using the most recent insider trade price on Form 4 (Sep 25, 2026), not a market close. | ||||||||||||
Yun-Lung Chen!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Yun-Lung Chen are complete. VP, Business Dev. & Marketing | n/a | −16K | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for Yun-Lung ChenHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Yun-Lung Chen are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||
Christopher Paisley!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Christopher Paisley are complete. Director | n/a | −1K | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for Christopher PaisleyHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Christopher Paisley are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||
Hsiao-Wuen Hon!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Hsiao-Wuen Hon are complete. Director | n/a | 0 | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for Hsiao-Wuen HonHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Hsiao-Wuen Hon are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||
Chenming Hu!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Chenming Hu are complete. Director | n/a | 0 | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for Chenming HuHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Chenming Hu are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||
David Richardson!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for David Richardson are complete. Director | n/a | 0 | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for David RichardsonHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for David Richardson are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||
Christopher Day!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Christopher Day are complete. VP, Marketing | n/a | 0 | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for Christopher DayHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Christopher Day are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||
Elizabeth Schwarting!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Elizabeth Schwarting are complete. Director | n/a | −624 | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for Elizabeth SchwartingHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Elizabeth Schwarting are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||
Chantelle Breithaupt!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Chantelle Breithaupt are complete. Director | n/a | 0 | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for Chantelle BreithauptHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Chantelle Breithaupt are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||
Gregory Bryant!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Gregory Bryant are complete. Director | n/a | 0 | n/a | n/a | ||||||||
Vesting, gifts, unvested awards and holding lines for Gregory BryantHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Gregory Bryant are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||||||||||
Holdings and share of stake for Ambarella Inc are being verified, so no balances, unit counts or percentages are shown. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings.
Officer and director open-market sales: $16.9M across 243,443 shares. Plan status and stated purpose are separate questions, and a sale can have both.
The lighter segment is sales with no plan disclosed in the filing ($8.8M), including tax-related sales outside a plan.
Sales with no 10b5-1 plan and no tax reference in the filing. $2.0M of it is Chi-Hong Ju. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Chi-Hong Ju, Jul 1, 2026
$5.5M of sales (32.4%) cite tax obligations in their footnotes, $216K of them also under a plan. Example: John Young, Sep 17, 2026
Gifts the filings describe as charitable. Gifts are not sales and are not included in the sale totals.
| Seller | Shares sold | Proceeds | Under a disclosed plan | Share of total | Sales dates |
|---|---|---|---|---|---|
| Feng-Ming Wang CEO, Director | 143K | $10.1M | 74% | 60% | Dec 17, 2025 to Sep 17, 2026 |
| Chi-Hong Ju Senior VP, Systems & GM | 38K | $2.8M | 0% | 16% | Dec 17, 2025 to Sep 17, 2026 |
| John Young CFO | 26K | $1.7M | 37% | 10% | Dec 17, 2025 to Sep 18, 2026 |
| Yun-Lung Chen VP, Business Dev. & Marketing | 16K | $1.1M | 0% | 7% | Jun 12, 2026 to Jul 9, 2026 |
| Chan Lee Chief Operations Officer | 19K | $1.1M | 0% | 7% | Dec 17, 2025 to Sep 17, 2026 |
| Christopher Paisley Director | 1K | $69K | 48% | 0.4% | Dec 26, 2025 to Sep 25, 2026 |
| Elizabeth Schwarting Director | 624 | $45K | 0% | 0.3% | Dec 16, 2025 to Dec 16, 2025 |
| Month | Sale proceeds | Disclosed plan | To cover taxes | No plan disclosed |
|---|---|---|---|---|
| Oct 2025 | $0 | $0 | $0 | $0 |
| Nov 2025 | $0 | $0 | $0 | $0 |
| Dec 2025 | $1.7M | $0 | $810K | $916K |
| Jan 2026 | $584K | $0 | $0 | $584K |
| Feb 2026 | $0 | $0 | $0 | $0 |
| Mar 2026 | $5.8M | $3.0M | $2.8M | $0 |
| Apr 2026 | $118K | $118K | $0 | $0 |
| May 2026 | $3.0M | $3.0M | $0 | $0 |
| Jun 2026 | $1.8M | $355K | $758K | $661K |
| Jul 2026 | $2.8M | $1.5M | $0 | $1.4M |
| Aug 2026 | $0 | $0 | $0 | $0 |
| Sep 2026 | $1.1M | $145K | $915K | $0 |
| Oct 2026 | $0 | $0 | $0 | $0 |
In line with the past 5 years. 7 insiders sold; the average is 10 a year.
| 12 months ending | Shares sold | Insiders who sold | Proceeds |
|---|---|---|---|
| Oct 16, 2026 Latest 12 months | 243K | 7 | $16.9M |
| Oct 16, 2025 1 year earlier | 104K | 10 | $7.3M |
| Oct 16, 2024 2 years earlier | 120K | 11 | $6.7M |
| Oct 17, 2023 3 years earlier | 130K | 8 | $10.0M |
| Oct 17, 2022 4 years earlier | 287K | 11 | $32.5M |
| Oct 17, 2021 5 years earlier | 311K | 9 | $30.8M |
Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. A sale that an outside holder also reports (a family trust, a fund) is counted with outside holders in every year. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.
Holdings and share of stake are being verified. Balances, unit counts and every share-of-stake figure for Ambarella Inc are held back until that check is finished. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings and are complete.
External context: we only cite outside events when a documented connection exists. None is shown for this period.
All 1,100 Forms 3, 4 and 5 on record for Ambarella Inc (SEC CIK 1280263), filed from Oct 9, 2012 to Sep 28, 2026; 47 of them were filed in the 12 months this page covers, retrieved from SEC EDGAR on Oct 16, 2026. Prices are the ones reported in each filing, often weighted averages.
Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.
Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".
Spotted something wrong on this page? Report an error. We check every report against the SEC filing and list what we fix in the corrections log.