ACM Research, Inc.
ACM Research, Inc. (ACMR) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ACMR · as of Mar 31, 2025
Ownership Breakdown
267
Institutional Holders
▲ 69 vs Q4
$838.08M
Total Inst. Value
▲ $298.66M vs Q4
64.12M
Shares Outstanding
freeFloat 90.19%
35.88M
13F Shares Held
▲ 152,391 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ACMR largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. special industry machinery, nec | 4.21M | 6.66% | 6.66% | $98.32B | May 2, 2025 | ▼ 690.7K |
VANGUARD GROUP INC special industry machinery, nec | 4.06M | 6.41% | 6.41% | $94.65B | May 9, 2025 | ▼ 146.1K |
MITSUBISHI UFJ TRUST & BANKING CORP special industry machinery, nec | 1.65M | 2.61% | 2.61% | $38.59B | May 9, 2025 | ▲ 184.0K |
TRIATA CAPITAL LTD special industry machinery, nec | 1.37M | 2.17% | 2.17% | $32.00B | May 14, 2025 | ▲ 344.2K |
INVESCO LTD. special industry machinery, nec | 1.34M | 2.12% | 2.12% | $31.25B | May 12, 2025 | ▲ 206.1K |
STATE STREET CORP special industry machinery, nec | 1.24M | 1.96% | 1.96% | $28.88B | May 15, 2025 | ▼ 13.7K |
GEODE CAPITAL MANAGEMENT, LLC special industry machinery, nec | 1.22M | 1.92% | 1.92% | $28.40B | May 13, 2025 | ▲ 31.8K |
PEAK6 LLC special industry machinery, nec | 1.10M | 1.73% | 1.73% | $25.57B | May 14, 2025 | ▲ 791.5K |
FEDERATED HERMES, INC. special industry machinery, nec | 1.07M | 1.70% | 1.70% | $25.04B | May 8, 2025 | ▲ 1.06M |
PERTENTO PARTNERS LLP special industry machinery, nec | 1.02M | 1.62% | 1.62% | $23.91B | May 14, 2025 | ▼ 160.4K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
21
Increased
+6.06M shares6
New Positions
first time holders22
Decreased
−5.92M shares0
Sold Out
fully exitedNet shares change (top 50)
+138.1K
+6.06M / −5.92M
Net new holders
+5
6 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ACMR insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
6
Buy transactions
29
Sell transactions
0.21
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Cheav Sotheara See remarks | Jun 4, 2026 | Sale | 1,300 | $84.08 | $109.3K | 112.1K | Form 4 ↗ |
Cheav Sotheara See remarks | Jun 5, 2026 | Sale | 2,384 | $81.73 | $194.8K | 103.0K | Form 4 ↗ |
Cheav Sotheara See remarks | Jun 4, 2026 | Sale | 9,212 | $85.11 | $784.0K | 102.8K | Form 4 ↗ |
Cheav Sotheara See remarks | Jun 5, 2026 | Sale | 968 | $82.61 | $80.0K | 102.0K | Form 4 ↗ |
Cheav Sotheara See remarks | Jun 5, 2026 | Sale | 400 | $84.01 | $33.6K | 101.6K | Form 4 ↗ |
Cheav Sotheara See remarks | Jun 4, 2026 | Sale | 2,839 | $85.77 | $243.5K | 100.0K | Form 4 ↗ |
Cheav Sotheara See remarks | Jun 5, 2026 | Sale | 1,647 | $85.41 | $140.7K | 100.0K | Form 4 ↗ |
Wang David H See Remarks | Jun 3, 2026 | Sale | 4,300 | $87.57 | $376.6K | 858.4K | Form 4 ↗ |
Wang David H See Remarks | Jun 3, 2026 | Sale | 6,295 | $88.98 | $560.1K | 852.1K | Form 4 ↗ |
Wang David H See Remarks | Jun 4, 2026 | Sale | 2,060 | $83.86 | $172.8K | 840.6K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
ACM Research, Inc. (ACMR) is primarily owned by institutional investors, who hold approximately 56.0% of total shares outstanding. Company insiders own approximately 9.81%, while retail and public investors account for the remaining 34.23%.
The largest institutional shareholder of ACM Research, Inc. is BLACKROCK, INC., holding approximately 4.21 million shares — equal to 6.66% of outstanding shares — as of March 31, 2025.
A total of 267 institutional investors currently hold ACMR stock, with a combined institutional value of approximately $838,076,306 as of the most recent 13F filing period.
Frequently asked questions
ACMR ownershipACM Research, Inc. (ACMR) is primarily owned by institutional investors, who hold approximately 56.0% of shares. The largest shareholder is BLACKROCK, INC. with a 6.66% stake. Company insiders hold 9.81%. Data sourced from SEC Form 13F as of March 31, 2025.