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The company

Ambarella, Inc. -

AMBA · Nasdaq

TechnologySemiconductorsNot moving yetAIAutonomy

AMBA stood above a rising 150-day average in 15 of the last 52 weekly readings, and has been out of that trend for the last 2 weeks. It is 10.3% below that average now. Semiconductors: 25% of its 68 stocks in an uptrend (−15 points in four weeks); Technology: 29% (−3 points in four weeks).

SEC filings

Statistics

Rotation: Not moving yet
Weeks in an uptrend: out for 2
Industry in uptrend: 25% -15 in 4 wk
Insider buys, 12 months: $0
Insider sales, 12 months: $32.9M
Officials’ trades on record: 4
Institutions holding: 319 (+37)

In the rotation

Each square a week: lit when it closed above a rising 150-day average. 15 of 52 weeks.

17 Apr – 16 Oct

Semiconductors: A minority of its stocks are in an uptrend and the share has fallen sharply over four weeks. Technology: A minority of its stocks are in an uptrend and the share has been slipping.

Money in and out

1 Nov 2024 – 1 Oct 2026

Open-market buys above the line and sales below, in dollars.

Congress and officials

4 disclosed lines: House 4, Senate 0, executive 0; 2 people.

Who	Did	Amount	Traded
Donna E. Shalala House: U.S. House ClerkFL27	sold	$1k–$15k	24 Jun 2019filed 27 Apr 2020
Donna E. Shalala House: U.S. House ClerkFL27	bought	$1k–$15k	15 May 2019filed 27 Apr 2020
Donna E. Shalala House: U.S. House ClerkFL27	bought	$1k–$15k	16 Apr 2019filed 27 Apr 2020
Barbara Comstock House: U.S. House ClerkVA10	sold	$1k–$15k	19 Jun 2015filed 19 Jun 2015

Insiders

Buy orders, 12 months0

Sale orders, 12 months37

Buyers · sellers0 · 7

Who	Did	Shares	Traded
Christopher B. PaisleyDirector	sold	250at $70.76	25 Sep 2026filed 28 Sep 2026
John Alexander YoungCFO	sold	1,896at $67.28	18 Sep 2026filed 21 Sep 2026
John Alexander YoungCFO	sold	3,126at $64.83	17 Sep 2026filed 18 Sep 2026
Chan W. LeeChief Operations Officer	sold	2,893at $64.83	17 Sep 2026filed 18 Sep 2026
Chi-Hong JuSenior VP, Systems & GM	sold	2,009at $64.83	17 Sep 2026filed 18 Sep 2026
Feng-Ming WangCEO	sold	6,086at $64.83	17 Sep 2026filed 18 Sep 2026
Yun-Lung ChenVP, Business Dev. & Marketing	sold	5,958at $78.66	9 Jul 2026filed 10 Jul 2026
Feng-Ming WangCEO	sold	16,250at $90.08	1 Jul 2026filed 2 Jul 2026
Chi-Hong JuSenior VP, Systems & GM	sold	10,000at $88.84	1 Jul 2026filed 2 Jul 2026
Christopher B. PaisleyDirector	sold	250at $62.01	26 Jun 2026filed 30 Jun 2026
Feng-Ming WangCEO	sold	6,204at $67.87	17 Jun 2026filed 18 Jun 2026
Chi-Hong JuSenior VP, Systems & GM	sold	2,017at $67.87	17 Jun 2026filed 18 Jun 2026

Lines filed since 2 January 2026, newest first; every insider’s older lines are on their own page.

Institutions

Holders319+37 on the quarter

New · exited88 · 52

Reported value$2.9B

Quarter to 30 Jun 2026, against 31 Mar 2026; newest filing 31 Aug 2026.

Manager	Shares	Change
BlackRock, Inc.added · filed 7 Aug 2026	3,944,592$338.4M	+155,377+4.1%
VANGUARD PORTFOLIO MANAGEMENT LLCreduced · filed 13 Aug 2026	3,688,405$316.5M	-28,458−0.8%
STATE STREET CORPadded · filed 7 Aug 2026	2,562,733$219.9M	+586,269+29.7%
VANGUARD CAPITAL MANAGEMENT LLCadded · filed 13 Aug 2026	1,873,539$160.7M	+58,936+3.2%
MANUFACTURERS LIFE INSURANCE COMPANY, THEreduced · filed 14 Aug 2026	1,186,541$158.2M	-399,541−25.2%
Legal & General Group Plcadded · filed 14 Aug 2026	1,116,729$95.8M	+190,333+20.5%
GEODE CAPITAL MANAGEMENT, LLCadded · filed 12 Aug 2026	1,098,120$94.2M	+68,891+6.7%
MENORA MIVTACHIM HOLDINGS LTD.new · filed 13 Aug 2026	757,571$65.0M	+757,571
Stephens Investment Management Group LLCadded · filed 29 Jul 2026	721,711$61.9M	+246,570+51.9%
DIMENSIONAL FUND ADVISORS LPadded · filed 11 Aug 2026	718,154$61.6M	+79,567+12.5%