Oberweis Asset Management’s Ambarella AMBA Stock Holding History

Oberweis Asset Management’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
2026 Q2	$29.4M	Buy	342,254 +47,069	+16%	+$3.24M	0.61%	62
2026 Q1	$15.2M	Sell	295,185 -322,675	-52%	-$20.1M	0.45%	90
2025 Q4	$43.8M	Buy	617,860 +6,500	+1%	+$525K	1.6%	5
2025 Q3	$50.4M	Buy	611,360 +38,000	+7%	+$2.76M	1.93%	4
2025 Q2	$37.9M	Buy	573,360 +4,535	+0.8%	+$240K	1.65%	7
2025 Q1	$28.6M	Buy	568,825 +386,025	+211%	+$26.4M	1.43%	6
2024 Q4	$13.3M	Buy	182,800 +20,800	+13%	+$1.33M	0.63%	67
2024 Q3	$9.14M	Buy	+162,000	New	+$8.62M	0.47%	85
2015 Q1	–	Sell	-21,611	Closed	-$1.1M	–	171
2014 Q4	$1.1M	Sell	21,611 -36,789	-63%	-$1.72M	0.33%	56
2014 Q3	$2.55M	Sell	58,400 -17,300	-23%	-$573K	0.7%	40
2014 Q2	$2.36M	Sell	75,700 -16,700	-18%	-$441K	0.58%	46
2014 Q1	$2.47M	Hold	92,400	–	–	0.52%	46
2013 Q4	$3.13M	Sell	92,400 -12,500	-12%	-$287K	0.76%	40
2013 Q3	$2.05M	Buy	104,900 +54,800	+109%	+$932K	0.58%	39
2013 Q2	$843K	Buy	+50,100	New	+$761K	0.24%	80

Other funds holding AMBA

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Manulife (Manufacturers Life Insurance) Canada, Ontario, Canada $128B AUM 35.83% 1-Year Est. Return

Legal & General Group London, United Kingdom $480B AUM 42.84% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

MMH

Menora Mivtachim Holdings Ramat Gan, Israel $25.6B AUM 50.04% 1-Year Est. Return

SIMG

Stephens Investment Management Group Houston, Texas $9.33B AUM 56.1% 1-Year Est. Return

Oberweis Asset Management's AMBA Position: Q2 2026 in Review

Oberweis Asset Management increased its Ambarella (AMBA) stake by 16% in Q2 2026, buying an estimated $3.24M and bringing the position to 342,254 shares worth $29.4M. The position accounts for 0.61% of the portfolio, ranked #62.

Oberweis Asset Management first reported a position in AMBA in Q2 2013 and has held it in 15 quarters since. The position peaked at $50.4M in Q3 2025. 342 funds tracked by Wall St. Rank hold AMBA as of Q2 2026.

Oberweis Asset Management held 342,254 shares of Ambarella worth $29.4M as of Q2 2026.
Oberweis Asset Management bought 47,069 Ambarella shares in Q2 2026, an estimated $3.24M.
Ambarella made up 0.61% of Oberweis Asset Management's portfolio in Q2 2026, its #62 holding.
Oberweis Asset Management first reported a position in Ambarella in Q2 2013 and has held it in 15 quarters since.
Oberweis Asset Management's Ambarella position peaked at $50.4M in Q3 2025.
342 funds tracked by Wall St. Rank held Ambarella as of Q2 2026.

Based on Oberweis Asset Management's 13F filing for Q2 2026, filed 14 Aug 2026.