About this page
Insider trades reported on SEC Form 4: when the people who run a company buy or sell its shares with their own money.
How to read it
- Form 4
- The form a company insider (officer, director or owner of more than 10%) must file with the SEC within two business days of buying or selling the company's shares.
- Buy (P) and Sell (S)
- Open-market purchases and sales. Gifts, option exercises and automatic tax withholding are left out because they say little about what the insider thinks.
- Value
- Shares times price, as reported on the filing.
- 10b5-1
- A trade made under a plan set up in advance. Planned sales are common and usually say less than an unplanned purchase.
- Late filing
- A Form 4 filed more than two business days after the trade.
- Vs. S&P 500
- How the stock did after the trade minus how the overall market did in the same weeks.
A real example
In January 2016, when bank stocks were falling, JPMorgan Chase CEO Jamie Dimon bought 500,000 JPMorgan shares with his own money, worth about $26 million. His Form 4 made the purchase public within days, and investors read it as a strong sign of confidence.
Explain it like I'm 13
If the coach of a team bets his own allowance that his team will win, that tells you something. A Form 4 is the note a company boss must hand in whenever he buys or sells his own company's shares, so everyone can see it.
Data from public SEC filings and congressional reports. Information, not investment advice. Check every number against the filing linked on the page.
AMBARELLA INC (AMBA): Insider Trades and Fund Holdings
In the past 12 months, AMBARELLA INC insiders reported no open-market purchases and 15 sales worth $5.66M; 5 of the sales were reported as made under a 10b5-1 trading plan.
Timeline: news and trades
Company filings (8-K), insider trades, notices of planned sales (Form 144), Congress trades and fund moves in the past year, newest first.
- Sep 25, 2026Insider saleDirector Christopher B. Paisley sold $17,690 under a 10b5-1 plan
- Sep 25, 2026Planned salePAISLEY CHRISTOPHER B (director) filed notice to sell about $17,690 around Sep 25, 2026
- Sep 18, 2026Insider saleCFO John Alexander Young sold $127,563 under a 10b5-1 plan
- Sep 18, 2026Planned saleJOHN YOUNG (officer) filed notice to sell about $126,861 around Sep 18, 2026
- Sep 17, 2026Insider saleCEO Feng-Ming Wang sold $394,555
- Sep 17, 2026Insider saleCFO John Alexander Young sold $202,659
- Sep 17, 2026Insider saleChief Operations Officer Chan W. Lee sold $187,553
- Sep 17, 2026Insider saleVP Chi-Hong Ju sold $130,243
- Sep 3, 2026NewsCompany reported: Quarterly or annual results
- Jul 9, 2026Insider saleVP Yun-Lung Chen sold $468,656
- Jul 1, 2026Insider saleCEO Feng-Ming Wang sold $1.5 million under a 10b5-1 plan
- Jul 1, 2026Insider saleVP Chi-Hong Ju sold $888,400
- Jun 30, 2026FundRenaissance Technologies cut 45% in Q2 2026 (13F filed Aug 13, 2026)
- Jun 26, 2026Insider saleDirector Christopher B. Paisley sold $15,503 under a 10b5-1 plan
- Jun 17, 2026Insider saleCEO Feng-Ming Wang sold $421,065
- Jun 17, 2026Insider saleCFO John Alexander Young sold $339,946 under a 10b5-1 plan
- Jun 17, 2026Insider saleChief Operations Officer Chan W. Lee sold $200,284
- Jun 17, 2026Insider saleVP Chi-Hong Ju sold $136,894
- Jun 12, 2026Insider saleVP Yun-Lung Chen sold $660,943
Recent insider trades
Open-market purchases (code P) and sales (code S) from Form 4. Grants, option exercises and gifts are not shown. Latest filing: Sep 28, 2026.
| Filed | Insider | Type | Value |
|---|---|---|---|
| Sep 28 | Christopher B. PaisleyDirector | ▼ SELL10b5-1 | $18K |
| Sep 21 | John Alexander YoungCFO | ▼ SELL10b5-1 | $128K |
| Sep 18 | Feng-Ming WangCEO | ▼ SELL | $395K |
| Sep 18 | John Alexander YoungCFO | ▼ SELL | $203K |
| Sep 18 | Chan W. LeeChief Operations Officer | ▼ SELL | $188K |
| Sep 18 | Chi-Hong JuVP | ▼ SELL | $130K |
| Jul 10 | Yun-Lung ChenVP | ▼ SELL | $469K |
| Jul 2 | Feng-Ming WangCEO | ▼ SELL10b5-1 | $1.46M |
| Jul 2 | Chi-Hong JuVP | ▼ SELL | $888K |
| Jun 30 | Christopher B. PaisleyDirector | ▼ SELL10b5-1 | $16K |
Insiders who traded in the past year
| Insider | Role | Buys | Bought | Sells | Sold |
|---|---|---|---|---|---|
| Christopher B. Paisley | Director | 0 | $0 | 2 | $33K |
| John Alexander Young | CFO | 0 | $0 | 3 | $670K |
| Feng-Ming Wang | CEO | 0 | $0 | 3 | $2.28M |
| Chan W. Lee | Chief Operations Officer | 0 | $0 | 2 | $388K |
| Chi-Hong Ju | VP | 0 | $0 | 3 | $1.16M |
| Yun-Lung Chen | VP | 0 | $0 | 2 | $1.13M |
Buybacks and executive pay
AMBARELLA INC spent $1 million buying back its own shares in 2025.
| Year | CEO pay reported | CEO pay "actually paid" | Value of $100 invested |
|---|---|---|---|
| 2025 | $7.35M | $3.60M | n/a |
| 2024 | $7.48M | $12.1M | n/a |
| 2023 | $5.81M | −$779K | n/a |
From the company's XBRL data filed with the SEC. "Actually paid" is the SEC's pay-versus-performance measure, which counts changes in the value of stock awards. "Value of $100 invested" is the company's cumulative shareholder return as reported, usually measured from five years earlier. See all buybacks and CEO pay across companies.
A All 15 insider trades reported on time. How it is graded
Tracked funds that report AMBA
From each fund's latest 13F. Holdings are as of quarter end and are filed up to 45 days later.
| Fund | Shares | Value | Change |
|---|---|---|---|
| Renaissance Technologies | 110,300 | $9.46M | ▼ −44.7% |
Reading these numbers
Insiders sell for many reasons: taxes, diversification, a house. Purchases with their own money are rarer and are usually read as more informative. A Form 4 is due within two business days of the trade. How to read a Form 4 →