ACM RESEARCH INC-CLASS A (ACMR) Institutional Ownership and Insiders Activity

ACM RESEARCH INC-CLASS A (ACMR) is widely held by institutional investors, with 4 tracked firms reporting positions valued at approximately $40.68M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Longleaf Partners is the largest disclosed holder, reporting approximately $30.81M in ACMR holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with Longleaf Partners representing the majority of disclosed value.

Recent insider activity includes 27 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.