Oberweis Asset Management’s ACM Research ACMR Stock Holding History

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

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$1.65M	Hold	13,000	–	–	0.03%	151
2026 Q1	$512K	Buy	+13,000	New	+$690K	0.02%	159
2025 Q3	–	Sell	-246,960	Closed	-$6.4M	–	183
2025 Q2	$6.4M	Sell	246,960 -49,988	-17%	-$1.12M	0.28%	124
2025 Q1	$6.93M	Sell	296,948 -188,252	-39%	-$4.3M	0.35%	109
2024 Q4	$7.33M	Buy	485,200 +68,700	+16%	+$1.24M	0.35%	111
2024 Q3	$8.45M	Sell	416,500 -24,630	-6%	-$472K	0.43%	89
2024 Q2	$10.2M	Hold	441,130	–	–	0.62%	57
2024 Q1	$12.9M	Buy	441,130 +47,730	+12%	+$1.09M	0.93%	27
2023 Q4	$7.69M	Buy	393,400 +51,600	+15%	+$902K	0.72%	38
2023 Q3	$6.19M	Buy	341,800 +56,200	+20%	+$836K	0.66%	42
2023 Q2	$3.74M	Buy	285,600 +70,000	+32%	+$737K	0.45%	83
2023 Q1	$2.52M	Buy	+215,600	New	+$2.49M	0.39%	83
2022 Q2	–	Sell	-64,000	Closed	-$1.32M	–	160
2022 Q1	$1.32M	Buy	+64,000	New	+$1.61M	0.27%	82
2021 Q2	–	Sell	-18,000	Closed	-$485K	–	159
2021 Q1	$485K	Buy	+18,000	New	+$595K	0.1%	116
2020 Q4	–	Sell	-30,960	Closed	-$713K	–	134
2020 Q3	$713K	Sell	30,960 -73,440	-70%	-$2.09M	0.24%	69
2020 Q2	$2.17M	Buy	104,400 +29,400	+39%	+$483K	0.85%	21
2020 Q1	$740K	Buy	+75,000	New	+$809K	0.41%	53

Other funds holding ACMR

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

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Capital World Investors Los Angeles, California $846B AUM 46.74% 1-Year Est. Return

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

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

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

VARA

Value Aligned Research Advisors Princeton, New Jersey $40.1B AUM 376.19% 1-Year Est. Return

WFM Asia Road Town, Tortola, British Virgin Islands $663M AUM 15.46% 1-Year Est. Return

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

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

Oberweis Asset Management held its ACM Research (ACMR) position steady in Q2 2026 at 13,000 shares worth $1.65M. The position accounts for 0.03% of the portfolio, ranked #151.

Oberweis Asset Management first reported a position in ACMR in Q1 2020 and has held it in 17 quarters since. The position peaked at $12.9M in Q1 2024. 373 funds tracked by Wall St. Rank hold ACMR as of Q2 2026.

Oberweis Asset Management held 13,000 shares of ACM Research worth $1.65M as of Q2 2026.
Oberweis Asset Management left its ACM Research share count unchanged in Q2 2026.
ACM Research made up 0.03% of Oberweis Asset Management's portfolio in Q2 2026, its #151 holding.
Oberweis Asset Management first reported a position in ACM Research in Q1 2020 and has held it in 17 quarters since.
Oberweis Asset Management's ACM Research position peaked at $12.9M in Q1 2024.
373 funds tracked by Wall St. Rank held ACM Research as of Q2 2026.

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