ACM RESEARCH INC-CLASS A (ACMR) Stock Institutional Trading Activity


ACM RESEARCH INC-CLASS A (ACMR) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Longleaf Partners, Renaissance Technologies LLC, and Dodge & Cox Stock Fund. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2025Renaissance Technologies LLCSell-175,486124,439$4,909,119
Q4 2025Longleaf PartnersBuy194,4941,680,181$66,283,140
Q3 2025Dodge & Cox Stock FundBuy41,800122,892$4,808,764
Q3 2025Renaissance Technologies LLCBuy262,925299,925$11,736,065
Q3 2025Longleaf PartnersBuy299,9431,485,687$58,134,932
Q2 2025Dodge & Cox Stock FundBuy18,00081,092$2,100,283
Q2 2025Renaissance Technologies LLCSell-108,80037,000$958,300
Q2 2025Longleaf PartnersBuy1,185,7441,185,744$30,710,770
Q1 2025Dodge & Cox Stock FundBuy9,50063,092$1,472,567
Q4 2024Dodge & Cox Stock FundBuy10,59253,592$809,239
Q3 2024Dodge & Cox Stock FundBuy43,00043,000$872,900
Q1 2024Renaissance Technologies LLCBuy34,200145,800$4,249
Q4 2022Renaissance Technologies LLCBuy15,800111,600$860
Q1 2022Renaissance Technologies LLCBuy11,50095,800$1,982
Q4 2021Renaissance Technologies LLCBuy34,70084,300$7,188
Q3 2019Renaissance Technologies LLCSell-80049,600$687
Q2 2019Renaissance Technologies LLCBuy50,40050,400$787

Frequently asked questions about ACMR activity

  • Which institutional owners are buying ACMR?

    Institutional owners buying ACMR include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in ACMR activity?

    "Buy" means an investor increased their reported position in ACMR compared to the prior reporting period. This reflects growing exposure to ACM RESEARCH INC-CLASS A (ACMR) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in ACMR increasing?

    Institutional interest in ACMR can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.