ACM RESEARCH INC-CLASS A (ACMR) Institutional Ownership Changes & 13F Activity

ACM RESEARCH INC-CLASS A (ACMR) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Longleaf Partners, Dodge & Cox Stock Fund, and Renaissance Technologies LLC.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Longleaf PartnersSell-897,281782,900$30,807,115
Q1 2026Dodge & Cox Stock FundBuy7,500119,892$4,717,750
Q1 2026Renaissance Technologies LLCSell-1,839122,600$4,824,310
Q4 2025Longleaf PartnersBuy194,4941,680,181$66,283,140
Q4 2025Renaissance Technologies LLCSell-175,486124,439$4,909,119
Q4 2025Dodge & Cox Stock FundSell-10,500112,392$4,433,864
Q3 2025Longleaf PartnersBuy299,9431,485,687$58,134,932
Q3 2025Renaissance Technologies LLCBuy262,925299,925$11,736,065
Q3 2025Dodge & Cox Stock FundBuy41,800122,892$4,808,764
Q2 2025Longleaf PartnersBuy1,185,7441,185,744$30,710,770
Q2 2025Renaissance Technologies LLCSell-108,80037,000$958,300
Q2 2025Dodge & Cox Stock FundBuy18,00081,092$2,100,283
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.

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