Oberweis Asset Management’s Alpha and Omega Semiconductor AOSL Stock Holding History

Oberweis Asset Management’s Portfolio AOSL Stock Details AOSL Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q4	–	Sell	-271,100	Closed	-$7.58M	–	180
2025 Q3	$7.58M	Buy	271,100 +26,800	+11%	+$744K	0.29%	123
2025 Q2	$6.27M	Buy	244,300 +66,600	+37%	+$1.45M	0.27%	129
2025 Q1	$4.42M	Hold	177,700	–	–	0.22%	141
2024 Q4	$6.58M	Sell	177,700 -27,000	-13%	-$1.01M	0.31%	117
2024 Q3	$7.6M	Buy	204,700 +24,700	+14%	+$938K	0.39%	100
2024 Q2	$6.73M	Buy	+180,000	New	+$4.76M	0.41%	92
2022 Q4	–	Sell	-48,700	Closed	-$1.5M	–	166
2022 Q3	$1.5M	Sell	48,700 -13,300	-21%	-$492K	0.35%	64
2022 Q2	$2.07M	Sell	62,000 -12,000	-16%	-$491K	0.52%	35
2022 Q1	$4.04M	Hold	74,000	–	–	0.81%	20
2021 Q4	$4.48M	Hold	74,000	–	–	0.82%	20
2021 Q3	$2.32M	Buy	74,000 +29,000	+64%	+$804K	0.48%	30
2021 Q2	$1.37M	Buy	+45,000	New	+$1.38M	0.3%	59

Other funds holding AOSL

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

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

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

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

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

Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return

Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return

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

WCM

Weber Capital Management San Francisco, California $118M AUM

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Oberweis Asset Management's AOSL Position: Q4 2025 in Review

Oberweis Asset Management sold out of Alpha and Omega Semiconductor (AOSL) in Q4 2025, closing a stake of 271,100 shares — an estimated $7.58M sold.

Oberweis Asset Management first reported a position in AOSL in Q2 2021 and held it in 12 quarters. The position peaked at $7.6M in Q3 2024. 168 funds tracked by Wall St. Rank hold AOSL as of Q4 2025.

Oberweis Asset Management reported no remaining Alpha and Omega Semiconductor position as of Q4 2025 after selling out during the quarter.
Oberweis Asset Management sold 271,100 Alpha and Omega Semiconductor shares in Q4 2025, an estimated $7.58M.
Oberweis Asset Management first reported a position in Alpha and Omega Semiconductor in Q2 2021 and held it in 12 quarters.
Oberweis Asset Management's Alpha and Omega Semiconductor position peaked at $7.6M in Q3 2024.
168 funds tracked by Wall St. Rank held Alpha and Omega Semiconductor as of Q4 2025.

Based on Oberweis Asset Management's 13F filing for Q4 2025, filed 17 Feb 2026.