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AMBA · Ambarella Inc
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AMBA Ambarella (AMBA) Insider Trading, Ownership & Congress Trades

Semiconductors & Electronics · Semiconductors & related devices · CIK 0001280263
Quote by TradingView
Form 144 · 2
Insider buyers, 180 days
0
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
206
13F, latest reported quarter
Conversions, 180 days
1
Codes C/M, not in net · $22.3K priced

What the filings say about AMBA

Insiders, 180 days
-$8.7M net sold
6 sellers · 10% of sales under a 10b5-1 plan
Planned sales (Form 144), 90 days
$144.6K
2 notices

Ambarella insider trades (Form 4)

Form 4 buys and sells (codes P and S). Grants, option exercises and conversions excluded.

Over the last 180 days, AMBARELLA INC insiders sold a net $8.7M of stock across 256 Form 4 purchases and sales, with no insider buying. Source: SEC Form 4 filings, as of 2026-10-27.

Insider
Filed
Shares
Value
Since filing
PAISLEY CHRISTOPHER B
Director
SELL
2026-09-28 SECtraded 2026-09-25
250
$17.7K
-2.8%
Context
  • 13 earlier Form 4 trades (code P or S) here by this insider (13 sales), the last on Jun 26, 2026.
  • The trade is 0.6% of the 43,930 shares held after it.
  • 4 other insiders sold within 30 days.
  • 206 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director PAISLEY CHRISTOPHER B sold about $17.7K of AMBA under a 10b5-1 plan on Sep 25, 2026; 4 other insiders sold within 30 days and 206 funds added in the latest 13F quarter.
Young John Alexander
CFO
SELL
2026-09-21 SECtraded 2026-09-18
1,896
$127.6K
-0.4%
Context
  • 18 earlier Form 4 trades (code P or S) here by this insider (18 sales), the last on Sep 17, 2026.
  • The trade is 1.8% of the 107,806 shares held after it.
  • 4 other insiders sold within 30 days.
  • 206 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: CFO Young John Alexander sold about $127.6K of AMBA under a 10b5-1 plan on Sep 18, 2026; 4 other insiders sold within 30 days and 206 funds added in the latest 13F quarter.
Ju Chi-Hong
Senior VP, Systems & GM
SELL
2026-09-18 SECtraded 2026-09-17
2,009
$130.2K
-2.9%
Context
  • 44 earlier Form 4 trades (code P or S) here by this insider (44 sales), the last on Jul 1, 2026.
  • The trade is 1.3% of the 154,153 shares held after it.
  • 4 other insiders sold within 30 days.
  • 206 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Senior VP, Systems & GM Ju Chi-Hong sold about $130.2K of AMBA on Sep 17, 2026; 4 other insiders sold within 30 days and 206 funds added in the latest 13F quarter.
Lee Chan W
Chief Operations Officer
SELL
2026-09-18 SECtraded 2026-09-17
2,893
$187.6K
-2.9%
Context
  • 34 earlier Form 4 trades (code P or S) here by this insider (34 sales), the last on Jun 17, 2026.
  • The trade is 1.9% of the 154,443 shares held after it.
  • 4 other insiders sold within 30 days.
  • 206 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chief Operations Officer Lee Chan W sold about $187.6K of AMBA on Sep 17, 2026; 4 other insiders sold within 30 days and 206 funds added in the latest 13F quarter.
Young John Alexander
CFO
SELL
2026-09-18 SECtraded 2026-09-17
3,126
$202.7K
-2.9%
Context
  • 17 earlier Form 4 trades (code P or S) here by this insider (17 sales), the last on Jun 17, 2026.
  • The trade is 2.8% of the 109,702 shares held after it.
  • 4 other insiders sold within 30 days.
  • 206 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: CFO Young John Alexander sold about $202.7K of AMBA on Sep 17, 2026; 4 other insiders sold within 30 days and 206 funds added in the latest 13F quarter.
256 transactions on record
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
See all insider buying · insider selling
Showing the latest few. to see 251 more transactions and use the screener and CSV export. We store only your email; there is no password.
Seven facts, ranked against the sector · Rank is not a forecast
Insiders
net -$8.7M over 180 days
-$1.1M over 90 days
below 60% of Semiconductors & Electronics
Congress
no House purchase disclosed in the last 12 months
Funds
206 funds bought in last quarter
more than 58% of Semiconductors & Electronics
Revenue
+37.2% year over year
more than 76% of Semiconductors & Electronics
Margin
-19.4% net margin
below 68% of Semiconductors & Electronics
Buybacks
$2.4M repurchased, FY to 2026-07-31
below 84% of Semiconductors & Electronics
Short interest
12.2% of the float short (float per yahoo 2026-10-26) · 3.5 days to cover · settled 2026-09-30
more than 81% of Semiconductors & Electronics
What changed in the last 30 days
Sep 28Director PAISLEY CHRISTOPHER B sold $17.7K under a 10b5-1 plan (Sep 25)
Why it matters
A 10b5-1 plan schedules trades months ahead, so this says little about what the insider thinks today.

Watch AMBA

A free account keeps a watchlist and can send one email a day when insiders, funds or Congress file on the names in it. No password and no card.

The year, with the filings on it
Total return over 12 months. Each marker is a filing; hover or tap one for the detail.
-16.3%12M
-39%-19%+0%+20%2025-102025-122026-022026-042026-062026-082026-10 2026-03-02 · Wang Feng-Ming sold $2.0M2026-05-26 · Wang Feng-Ming sold $1.6M2026-07-01 · Wang Feng-Ming sold $1.5M2026-03-17 · Wang Feng-Ming sold $1.0M2026-07-01 · Ju Chi-Hong sold $888.4K2026-05-26 · Wang Feng-Ming sold $842.3K2026-03-02 · Wang Feng-Ming sold $739.5K2026-06-12 · Chen Yun-Lung sold $660.9K2026-01-05 · Ju Chi-Hong sold $584.1K2025-12-30 · Ju Chi-Hong sold $558.1K2026-05-26 · Wang Feng-Ming sold $553.3K2026-07-09 · Chen Yun-Lung sold $468.7K2026-03-19 · Wang Feng-Ming sold $437.6K2026-06-17 · Wang Feng-Ming sold $421.1K2026-09-17 · Wang Feng-Ming sold $394.6K2025-12-17 · Wang Feng-Ming sold $355.5K2026-03-17 · Lee Chan W sold $355.1K2025-12-18 · Young John Alexander sold $276.6K2025-12-30 · Ju Chi-Hong sold $264.8K2026-03-17 · Ju Chi-Hong sold $249.5K2026-03-17 · Young John Alexander sold $241.5K2026-06-17 · Young John Alexander sold $216.2K2026-09-17 · Young John Alexander sold $202.7K2026-06-17 · Lee Chan W sold $200.3K2026-03-19 · Lee Chan W sold $197.1K2026-09-17 · Lee Chan W sold $187.6K2025-12-17 · Young John Alexander sold $185.2K2025-12-17 · Lee Chan W sold $172.8K2026-03-19 · Young John Alexander sold $164.5K2026-03-02 · Wang Feng-Ming sold $154.8K2026-06-17 · Ju Chi-Hong sold $136.9K2026-09-17 · Ju Chi-Hong sold $130.2K2026-09-18 · Young John Alexander sold $127.6K2026-06-17 · Young John Alexander sold $123.7K2026-04-21 · Young John Alexander sold $118.3K2026-03-19 · Ju Chi-Hong sold $116.7K2026-03-02 · Wang Feng-Ming sold $111.7K2025-12-17 · Ju Chi-Hong sold $96.4K2026-03-02 · Wang Feng-Ming sold $56.8K2025-12-16 · Schwarting Elizabeth M sold $45.2K2026-05-26 · Young John Alexander sold $38.4K2025-12-26 · PAISLEY CHRISTOPHER B sold $36.1K2026-09-25 · PAISLEY CHRISTOPHER B filed to sell $17.7K2026-09-18 · JOHN YOUNG filed to sell $126.9K2026-07-09 · YUN-LUNG CHEN filed to sell $468.7K2026-07-01 · FENG-MING WANG filed to sell $1.4M2026-07-01 · CHIHONG JOHN JU filed to sell $888.4K2026-06-26 · PAISLEY CHRISTOPHER B filed to sell $15.5K
Insider sellForm 144 (planned sale)
Indexed to 100, dividend-adjusted, not a price chart. When a name files heavily, the largest trades are drawn first.

Who owns AMBA: institutional holders (13F)

13F holdings, latest reported quarter
BlackRock, Inc.
3,944,592 sh
$338.4M
VANGUARD PORTFOLIO MANAGEMENT LLC
3,688,405 sh
$316.5M
STATE STREET CORP
2,562,733 sh
$219.9M
VANGUARD CAPITAL MANAGEMENT LLC
1,873,539 sh
$160.7M
MANUFACTURERS LIFE INSURANCE COMPANY, THE
1,186,541 sh
$158.2M

Congress trades in AMBA

No Congress trades reported
No House member has disclosed a trade in this stock. See what Congress is buying.

Activist and 5% holders (13D/13G)

No 5%+ ownership filings
Nobody has filed for crossing 5%. That is a fact, not missing data.

AMBA planned insider sales (Form 144)

Notice of intent to sell, filed before any sale
PAISLEY CHRISTOPHER B
Filed 2026-09-25
$17.7K
JOHN YOUNG
Filed 2026-09-18
$126.9K
YUN-LUNG CHEN
Filed 2026-07-09
$468.7K
FENG-MING WANG
Filed 2026-07-01
$1.4M
CHIHONG JOHN JU
Filed 2026-07-01
$888.4K

AMBA mutual fund holders (N-PORT)

Funds ranked by the share of their own portfolio in this stock (N-PORT).
ROBO Global Artificial Intelligence ETF
$12.1M position · as of 2026-07-31
2.9%
Needham Small Cap Growth Fund
$11.6M position · as of 2026-06-30
2.8%
RIVER OAK DISCOVERY FUND
$523.1K position · as of 2026-07-31
2.7%
Small Cap Core Trust
$7.8M position · as of 2026-06-30
2.2%
Small Cap Core Fund
$40.8M position · as of 2026-07-31
2.1%
ROBO Global Robotics and Automation Index ETF
$41.6M position · as of 2026-07-31
2.1%
SEC N-PORT, monthly, about 60 days late · funds ≥ $10M · % is the share of the fund's own portfolio
Executive pay vs shareholder return · Dr. Feng-Ming (Fermi) Wang
CEO pay, headline and as actually paid, against the company's return and its chosen peers' (DEF 14A).
FY
CEO total
Actually paid
Other execs, avg
TSR
Peer TSR
2025
$7.4M
$3.6M
$3.1M
-32%
+177%
2024
$7.5M
$12.1M
$3.8M
-19%
+74%
2023
$5.8M
-$778.8K
$2.8M
-44%
+48%
2022
$5.9M
-$5.2M
$3.7M
-5%
+1%
2021
$6.2M
$21.2M
$2.6M
+49%
+21%
Tagged by the company under SEC Item 402(v). Returns are cumulative from the start of the disclosure period. Green where the company beat its own peer group.
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
Insiders have filed to sell, before selling.
The record shows a net $8.7M sold by insiders over 180 days, 206 funds added last quarter, $144.6K in planned Form 144 sales. Each figure is a federal filing, dated the day it went public.
Backtest this pattern Open the screener
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AMBA financials

Revenue growth
+37.2%
XBRL, annual
Net margin
-19.4%
Ratios from the company's XBRL filings, latest filings
Revenue, TTM
$417.8M
four quarters, 2025-08-01 to 2026-07-31
Net margin, TTM
-13.5%
net income over revenue, 2025-08-01 to 2026-07-31
Free cash flow, TTM
$9.7M
operating cash flow minus capex, 2025-08-01 to 2026-07-31
Debt to equity
n/a
no debt line filed
Cash flow to debt
n/a
no debt line filed
Return on equity
-9.4%
TTM net income over average of 2025-07-31 and 2026-07-31
Return on assets
-7.6%
TTM net income over average of 2025-07-31 and 2026-07-31
Return on invested capital
n/a
pre-tax loss, no effective tax rate to apply
Return on capital employed
-10.2%
operating income (EBIT proxy) over average of 2025-07-31 and 2026-07-31 minus current liabilities
P/E, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
Enterprise value
n/a
no debt line filed
FCF yield
+0.3%
TTM free cash flow over market value at close 2026-10-26
PEG, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
Price as of 2026-10-26. Hover or tap a tile for its yearly and quarterly history.
Method
TTM is four consecutive fiscal quarters; Q4 is the year minus nine months when not filed. Returns use the average of opening and closing balances. EBIT is approximated by operating income. PEG uses trailing EPS growth.
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
2026-012025-012024-012023-01
Revenue$390.7M$284.9M$226.5M$337.6M
Gross profit$231.3M$172.3M$136.8M$208.9M
Operating income-$82.5M-$126.6M-$154.6M-$74.3M
Net income-$75.9M-$117.1M-$169.4M-$65.4M
EPS (diluted)-1.78-2.84-4.25-1.70
Operating cash flow$73.5M$33.8M$19.0M$44.1M
Cash$191.0M$144.6M$144.9M$113.5M
Buybacks$1.0M$0$0$0
SEC XBRL, fiscal years, as known on 2026-10-27

AMBA Stock Sonar score 5/7 axes

Find similar shapesCompare

AMBA ranks highest on growth (84th percentile) and institutional and government (58th), and lowest on insider conviction (20th), among Semiconductors & Electronics peers.

ProfitGrowthInsidersInstitutionsRisk
Profitability
32
Inputs
  • Return on equity-9.4% · 31 pct, sector of 154
  • Return on assets-7.6% · 32 pct, sector of 171
  • Return on invested capitalpre-tax loss, no effective tax rate to apply
  • Return on capital employed-10.2% · 32 pct, sector of 155
Growth
84
Inputs
  • Revenue growth, YoY+37.2% · 76 pct, sector of 194
  • Backlog growth, YoY+133.2% · 92 pct, sector of 51
Insider conviction
20
Inputs
  • Net Form 4 buying (codes P and S), 180d-$8.5M · 40 pct, sector of 147
  • Insider buyers, 180d0 · 0 pct, sector of 151
Institutional and government
58
Inputs
  • Funds adding, latest quarter206 · 58 pct, sector of 184
  • Congress net buyers, 365dno Congress trades in 365 days
  • Federal contracts, 180dno federal contracts in 180 days
  • Lobbying spend, 4 quartersno lobbying filings in the last four quarters
Risk and compliance
48
Inputs
  • Short interest, % of float+12.2% · 24 pct, sector of 221
  • Recalls per $1B revenue, 3ynot measured for this sector, almost no peer has an event
  • EPA cases per $1B revenue, 5ynot measured for this sector, almost no peer has an event
  • New text in Risk Factors, latest 10-K+7.8% · 72 pct, sector of 152
2 not measured: Financial health, US patents
  • Financial health needs 1 of 2 inputs, 0 present: no debt line filed
  • US patents needs 1 of 2 inputs, 0 present: patent data not loaded yet

5 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored

AMBA filings, in plain words

Are Ambarella insiders buying or selling AMBA?

In the 180 days to 2026-10-27, Ambarella insiders were net sellers, a net $8.7M across purchases and sales reported on Form 4, by 6 sellers.

Are there planned insider sales of AMBA?

Yes. 2 Form 144 notices of planned insider sales were filed in the 90 days to 2026-10-27, covering $144.6K of stock; the latest, by PAISLEY CHRISTOPHER B, was filed 2026-09-25.

Read the full summary

In the 180 days to 2026-10-27, Ambarella insiders were net sellers of AMBA, a net $8.7M across purchases and sales reported on Form 4 by 6 sellers. 10% of the 20 insider sales were made under a Rule 10b5-1 plan; the rest were not flagged as planned. Insiders filed 2 Form 144 notices of intent to sell in the 90 days to 2026-10-27, covering $144.6K of stock. Each figure is counted from SEC and House filings as of 2026-10-27, dated the day the filing was made public.

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