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AMBA · Ambarella Inc
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TEAM-0.32% 13F +439META+2.47% 13F +2,694RCG-2.04% CLUSTERUTHR-4.03% 13F +425CRWV+4.49% 13F +693CRM+2.92% 13F +1,018CVNA-0.98% 13F +794TPL-0.71% 13F +444NET-4.47% 13F +710MSTR-1.35% 13F +526DELL+4.91% 13F +1,203CRWD+5.68% 13F +1,382ANET+1.22% 13F +1,323COIN+10.14% 13F +475TEAM-0.32% 13F +439META+2.47% 13F +2,694RCG-2.04% CLUSTERUTHR-4.03% 13F +425CRWV+4.49% 13F +693CRM+2.92% 13F +1,018CVNA-0.98% 13F +794TPL-0.71% 13F +444NET-4.47% 13F +710MSTR-1.35% 13F +526DELL+4.91% 13F +1,203CRWD+5.68% 13F +1,382ANET+1.22% 13F +1,323COIN+10.14% 13F +475
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AMBA

AMBARELLA INC
SEMICONDUCTORS & ELECTRONICS · SEMICONDUCTORS & RELATED DEVICES · CIK 0001280263
FORM 144 · 4☆ WATCH
INSIDER NET · 180D
-$10.5M
open-market buys minus sells, Form 4 codes P and S
INSIDER BUYERS · 180D
0
CONGRESS BUYERS · 1Y
0
FUNDS ADDED · QTR
207
13F, latest reported quarter
REVENUE GROWTH
+37.2%
XBRL, annual
NET MARGIN
-19.4%
CONVERSIONS · 180D
6
codes C/M, not in net · $22.3K priced
SEVEN FACTS, RANKED AGAINST THE SECTOR · RANK IS NOT A FORECAST
INSIDERS
net -$10.5M over 180 days
-$4.6M over 90 days
below 62% of Semiconductors & Electronics
CONGRESS
no member of Congress has reported trading it
FUNDS
207 funds added or opened last quarter
more than 61% of Semiconductors & Electronics
REVENUE
+37.2% year over year
more than 78% of Semiconductors & Electronics
MARGIN
-19.4% net margin
below 65% of Semiconductors & Electronics
BUYBACKS
$2.4M repurchased, FY to 2026-04-30
below 86% of Semiconductors & Electronics
SHORT
11.8% of shares outstanding short · 2.2 days to cover · settled 2026-07-31
more than 84% of Semiconductors & Electronics
THE SITUATION · EVERY LINE IS ONE RULE OVER ONE DATASET
Insiders are net sellers: -$10.5M across 6 people in 180 days.
207 funds added or opened positions in the latest 13F quarter, of 343 holders.
The year, with the filings on it
Total return indexed to 100 over the last 12 months · every marker is a federal filing, placed at its date — hover any marker for the detail
TOTAL 12M RETURN -21.5%
-21.5%12M
-39%-20%-0%+19%2025-092025-102025-122026-032026-052026-072026-09 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 $739.5K2025-09-10 · Chen Yun-Lung sold $716.9K2026-06-12 · 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 $553.3K2025-10-14 · Ju Chi-Hong sold $498.4K2026-07-09 · Chen Yun-Lung sold $468.7K2026-03-19 · Wang Feng-Ming sold $437.6K2026-06-17 · Wang Feng-Ming sold $421.1K2025-10-13 · Ju Chi-Hong sold $411.1K2025-09-17 · Wang Feng-Ming sold $391.4K2025-12-17 · 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 $241.5K2025-10-06 · Schwarting Elizabeth M sold $227.5K2026-06-17 · Young John Alexander sold $216.2K2025-09-17 · Young John Alexander sold $203.8K2026-06-17 · Lee Chan W sold $200.3K2026-03-19 · Lee Chan W sold $197.1K2025-12-17 · Young John Alexander sold $185.2K2025-09-17 · Kohn Leslie sold $178.6K2025-12-17 · Lee Chan W sold $172.8K2026-03-19 · Young John Alexander sold $164.5K2026-03-02 · Wang Feng-Ming sold $154.8K2025-09-17 · Lee Chan W sold $154.7K2026-06-17 · Ju Chi-Hong sold $136.9K2026-06-17 · 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 $96.4K2025-09-17 · Ju Chi-Hong sold $92.8K2026-07-09 · 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
INDEXED RETURN, DIVIDEND-ADJUSTED — NOT A PRICE CHART · LARGE TRADES DRAWN FIRST WHEN A NAME FILES HEAVILY
Live price
Daily candles from TradingView, on their licence — no filings are marked on this one
WHY THIS NAME IS ON THE DESK
Insiders have filed to sell — before selling.
The record shows a net $10.5M sold by insiders over 180 days, 207 funds added last quarter, $2.8M in planned Form 144 sales. Every figure is a federal filing, dated the day it became public.
Backtest this pattern Open the screener
Same sector, ranked by filing activity
Sector from the SEC's own SIC classification
NVDACRDOVICRMPWRVPLMALABPIMTSIMUAIPAVGOMSI
Insider transactions
Form 4 purchases and sales (codes P and S) — grants, option exercises and preferred conversions excluded

Over the last 180 days, AMBARELLA INC insiders sold a net $10.5M of stock across 250 Form 4 purchases and sales, with 0 insider(s) buying. Source: SEC Form 4 filings, as of 2026-09-05.

INSIDER
FILED
SHARES
VALUE
Chen Yun-Lung
VP, Business Dev. & Marketing
SELL
2026-07-09
5,958.0
$468.7K
Wang Feng-Ming
CEO
SELL
2026-07-01
16,250.0
$1.5M
Ju Chi-Hong
Senior VP, Systems & GM
SELL
2026-07-01
10,000.0
$888.4K
PAISLEY CHRISTOPHER B
Director
SELL
2026-06-26
250.0
$15.5K
Young John Alexander
CFO
SELL
2026-06-17
3,186.0
$216.2K
250 TRANSACTIONS ON RECORD

Showing the most recent few. Create a free account to see 245 more transactions on record, the cross-source screener and CSV export. We store only your email address, and there is no password to create.

Institutional holders
13F · holdings as of the latest quarter funds have reported
BlackRock, Inc.
3,944,592.0 sh
$338.4M
VANGUARD PORTFOLIO MANAGEMENT LLC
3,688,405.0 sh
$316.5M
STATE STREET CORP
2,562,733.0 sh
$219.9M
VANGUARD CAPITAL MANAGEMENT LLC
1,873,539.0 sh
$160.7M
MANUFACTURERS LIFE INSURANCE COMPANY, THE
1,186,541.0 sh
$158.2M
SCHEDULE 13D/G
No 5%+ ownership filings
Nobody has crossed 5% with a filing obligation. Absence is a fact here, not missing data.
Planned sales · Form 144
Filed before the sale — intent, not a trade
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
PAISLEY CHRISTOPHER B
FILED 2026-06-26
$15.5K
Fund concentration
N-PORT · funds ranked by how much of THEMSELVES they put in this stock — the conviction number 13F cannot show
RIVER OAK DISCOVERY FUND
$418.5K POSITION · AS OF 2026-04-30
2.7%
ROBO Global Artificial Intelligence ETF
$7.9M POSITION · AS OF 2026-04-30
2.5%
Small Cap Core Fund
$41.7M POSITION · AS OF 2026-04-30
2.1%
ROBO Global Robotics and Automation Index ETF
$31.4M POSITION · AS OF 2026-04-30
1.8%
Small Cap Core Trust
$4.1M POSITION · AS OF 2026-03-31
1.4%
Oberweis Micro-Cap Fund
$13.1M POSITION · AS OF 2026-03-31
1.3%
SEC N-PORT, MONTHLY WITH A ~60-DAY PUBLIC LAG · FUNDS ≥ $10M · % = SHARE OF THE FUND'S OWN BOOK
Executive pay vs shareholder return · Dr. Feng-Ming (Fermi) Wang
DEF 14A pay-versus-performance disclosure · both the headline pay and the SEC's mark-to-market figure, beside the return the company delivered and the return of the peer group it chose itself
FY
CEO TOTAL
ACTUALLY PAID
OTHER NEOs 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) · RETURN IS CUMULATIVE FROM THE START OF THE DISCLOSURE PERIOD · GREEN WHERE THE COMPANY BEAT ITS OWN PEER GROUP
Fundamentals
Annual figures from XBRL filings · pick a past date to see them exactly as the market knew them then — restatements and all
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-YEAR PERIODS · AS KNOWN ON 2026-09-05 · NOBODY ELSE SHOWS FUNDAMENTALS AS OF A PAST DATE
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Public filings, honestly analyzed. Official US government sources in one desk — every figure carries the date it was filed, and the methodology is published, backtest included.

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© 2026 WAVEMAN · SOURCE: SEC EDGAR & OFFICIAL GOVERNMENT DATA · NOT INVESTMENT ADVICE · CHART BY TRADINGVIEW · UPDATED 2026-09-05 ALL SYSTEMS LIVE FOR MACHINES →