Acm Research Inc (ACMR)
Who owns Acm Research Inc (ACMR)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 91.1% of the shares are freely tradable; institutional investors hold 74.2%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 11.55 | 7,984,847 | +1.2 | 03/31/2026 |
| Vanguard Group Inc | 7.19 | 4,972,103 | +2.6 | 12/31/2025 |
| Vanguard Capital Management, LLC | 3.28 | 2,264,337 | +0.0 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 3.19 | 2,203,831 | +0.0 | 03/31/2026 |
| State Street Corp | 2.90 | 2,006,116 | +2.5 | 03/31/2026 |
| WCM Investment Management | 2.69 | 1,860,874 | +16,878.8 | 03/31/2026 |
| Geode Capital Management, LLC | 1.98 | 1,371,227 | +2.1 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 4.68 | 3,234,598 | +0.0 | 05/29/2026 |
| Vanguard Total Stock Mkt Idx Inv | 2.34 | 1,620,470 | +0.3 | 04/30/2026 |
| Vanguard Information Technology ETF | 1.90 | 1,309,775 | +0.5 | 04/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 17. Apr 2026 | Charles C Pappis | Director | Sell | 5,000 | 52.00 | 260,000 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.