EAM Investors’s ACM Research ACMR Stock Holding History

EAM Investors’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 Q1	$1.73M	Buy	+43,874	New	+$2.33M	0.2%	175
2025 Q2	–	Sell	-85,967	Closed	-$2.01M	–	222
2025 Q1	$2.01M	Buy	+85,967	New	+$1.96M	0.35%	133
2023 Q4	–	Sell	-147,188	Closed	-$2.66M	–	236
2023 Q3	$2.66M	Buy	+147,188	New	+$2.19M	0.51%	53
2020 Q3	–	Sell	-175,146	Closed	-$3.64M	–	266
2020 Q2	$3.64M	Sell	175,146 -98,802	-36%	-$1.62M	0.8%	14
2020 Q1	$2.7M	Buy	273,948 +110,016	+67%	+$1.19M	0.84%	19
2019 Q4	$1.01M	Sell	163,932 -148,569	-48%	-$731K	0.22%	201
2019 Q3	$1.44M	Sell	312,501 -22,227	-7%	-$117K	0.38%	128
2019 Q2	$1.74M	Buy	334,728 +187,347	+127%	+$1.09M	0.43%	85
2019 Q1	$758K	Buy	+147,381	New	+$561K	0.19%	211
2018 Q3	–	Sell	-205,926	Closed	-$740K	–	298
2018 Q2	$740K	Hold	205,926	–	–	0.12%	248
2018 Q1	$844K	Buy	+205,926	New	+$551K	0.14%	220

Other funds holding ACMR

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

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

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

WCM Investment Management Laguna Beach, California $43.8B AUM 42.28% 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

Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return

VARA

Value Aligned Research Advisors Princeton, New Jersey $20.7B AUM 292.88% 1-Year Est. Return

PCP

Polunin Capital Partners London, United Kingdom $407M AUM 55.12% 1-Year Est. Return

EAM Investors's ACMR Position: Q1 2026 in Review

EAM Investors opened a new position in ACM Research (ACMR) in Q1 2026: 43,874 shares worth $1.73M. The stake represents 0.2% of the portfolio and ranks #175 among its holdings. This is a return to the name: EAM Investors previously reported a position in ACMR as recently as Q1 2025.

EAM Investors first reported a position in ACMR in Q1 2018 and has held it in 11 quarters since. The position peaked at $3.64M in Q2 2020. 300 funds tracked by Wall St. Rank hold ACMR as of Q1 2026.

EAM Investors held 43,874 shares of ACM Research worth $1.73M as of Q1 2026.
ACM Research was a new EAM Investors position in Q1 2026.
ACM Research made up 0.2% of EAM Investors's portfolio in Q1 2026, its #175 holding.
EAM Investors first reported a position in ACM Research in Q1 2018 and has held it in 11 quarters since.
EAM Investors's ACM Research position peaked at $3.64M in Q2 2020.
300 funds tracked by Wall St. Rank held ACM Research as of Q1 2026.

Based on EAM Investors's 13F filing for Q1 2026, filed 13 May 2026.