ACMR: ACM Research Inc insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 0 sales totaling - in the last 180 days.
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-07-31 | New 13G stake | Vanguard Portfolio Management | 5.31% | SEC |
Institutional ownership (Q2 2026)
377 institutions reported holding $5.76B of ACM Research Inc on Form 13F (301 the quarter before). 117 opened a new position and 39 sold out. Shares held by institutions: +9%.
| Largest holders | Shares | Value |
|---|---|---|
| BlackRock, Inc. | 8,660,842 | $1.10B |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3,349,436 | $425.01M |
| VANGUARD CAPITAL MANAGEMENT LLC | 2,462,745 | $312.50M |
| Capital World Investors | 2,398,036 | $304.29M |
| STATE STREET CORP | 2,188,254 | $277.67M |
| GEODE CAPITAL MANAGEMENT, LLC | 1,487,797 | $188.82M |
| Invesco Ltd. | 1,170,080 | $148.47M |
| Value Aligned Research Advisors, LLC | 1,053,949 | $133.74M |
| DIMENSIONAL FUND ADVISORS LP | 954,474 | $121.07M |
| WCM INVESTMENT MANAGEMENT, LLC | 917,651 | $109.09M |
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