Ardsley Advisory Partners’s Ambarella AMBA Stock Holding History

Ardsley Advisory Partners’s Portfolio AMBA Stock Details AMBA Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q3	–	Sell	-5,000	Closed	-$330K	–	135
2025 Q2	$330K	Buy	+5,000	New	+$265K	0.04%	139
2025 Q1	–	Sell	-2,500	Closed	-$182K	–	141
2024 Q4	$182K	Buy	+2,500	New	+$159K	0.03%	142
2023 Q1	–	Sell	-17,700	Closed	-$1.46M	–	105
2022 Q4	$1.46M	Buy	17,700 +10,700	+153%	+$712K	0.3%	60
2022 Q3	$393K	Sell	7,000 -4,600	-40%	-$341K	0.09%	92
2022 Q2	$759K	Sell	11,600 -84,400	-88%	-$6.8M	0.12%	92
2022 Q1	$10.1M	Buy	96,000 +87,000	+967%	+$11.1M	1.68%	15
2021 Q4	$1.83M	Sell	9,000 -15,000	-63%	-$2.78M	0.35%	50
2021 Q3	$3.74M	Buy	24,000 +1,500	+7%	+$172K	0.57%	39
2021 Q2	$2.4M	Buy	22,500 +2,500	+13%	+$248K	0.28%	62
2021 Q1	$2.01M	Sell	20,000 -5,000	-20%	-$544K	0.24%	58
2020 Q4	$2.3M	Sell	25,000 -97,750	-80%	-$6.84M	0.38%	50
2020 Q3	$6.41M	Buy	+122,750	New	+$5.94M	1.24%	25
2020 Q2	–	Sell	-18,000	Closed	-$874K	–	134
2020 Q1	$874K	Buy	+18,000	New	+$1.03M	0.34%	46
2018 Q1	–	Sell	-4,000	Closed	-$235K	–	144
2017 Q4	$235K	Buy	+4,000	New	+$222K	0.03%	122

Other funds holding AMBA

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

JCAM

Jericho Capital Asset Management New York $6.76B AUM 88.1% 1-Year Est. Return

Fuller & Thaler Asset Management San Mateo, California $29.7B AUM 43.33% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

Manulife (Manufacturers Life Insurance) Canada, Ontario, Canada $116B AUM 26.37% 1-Year Est. Return

UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

Barclays London, United Kingdom $416B AUM 33.63% 1-Year Est. Return

Ardsley Advisory Partners's AMBA Position: Q3 2025 in Review

Ardsley Advisory Partners sold out of Ambarella (AMBA) in Q3 2025, closing a stake of 5,000 shares — an estimated $330K sold.

Ardsley Advisory Partners first reported a position in AMBA in Q4 2017 and held it in 14 quarters. The position peaked at $10.1M in Q1 2022. 329 funds tracked by Wall St. Rank hold AMBA as of Q3 2025.

Ardsley Advisory Partners reported no remaining Ambarella position as of Q3 2025 after selling out during the quarter.
Ardsley Advisory Partners sold 5,000 Ambarella shares in Q3 2025, an estimated $330K.
Ardsley Advisory Partners first reported a position in Ambarella in Q4 2017 and held it in 14 quarters.
Ardsley Advisory Partners's Ambarella position peaked at $10.1M in Q1 2022.
329 funds tracked by Wall St. Rank held Ambarella as of Q3 2025.

Based on Ardsley Advisory Partners's 13F filing for Q3 2025, filed 14 Nov 2025.