Company · Ownership research

ACM Research, Inc. ACMR

CIK 0001680062 · CUSIP 00108J109

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 00108J109 (ACMR), not CUSIP 00108J909 (ACMR), CUSIP 00108J959 (ACMR), and does not merge CUSIPs.

This page lists the top 20 of 301 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$314.20M 7,984,847 shares	0.01%	+96.37K(+1.20%)Added	SEC filing ↗ May 13, 2026	▾
02	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$89.10M 2,264,337 shares	0.00%	—	SEC filing ↗ May 15, 2026	▾
03	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$86.72M 2,203,831 shares	0.00%	—	SEC filing ↗ May 8, 2026	▾
04	STATE STREET CORP CIK 93751 · View history	$78.94M 2,006,116 shares	0.00%	+48.08K(+2.50%)Added	SEC filing ↗ May 15, 2026	▾
05	WCM INVESTMENT MANAGEMENT, LLC CIK 1061186 · View history	$70.58M 1,860,874 shares	0.16%	+1.85M(+16,878.80%)Added	SEC filing ↗ May 7, 2026	▾
06	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$53.97M 1,371,227 shares	0.00%	+28.33K(+2.10%)Added	SEC filing ↗ May 15, 2026	▾
07	MORGAN STANLEY CIK 895421 · View history	$46.93M 1,192,705 shares	0.00%	-199.60K(-14.30%)Reduced	SEC filing ↗ May 15, 2026	▾
08	JANUS HENDERSON GROUP PLC CIK 1274173 · Amended · View history	$42.70M 1,085,634 shares	0.02%	+2.65K(+0.20%)Added	SEC filing ↗ May 18, 2026	▾
09	Value Aligned Research Advisors, LLC CIK 1963565 · View history	$37.62M 955,927 shares	0.45%	+955.93KNew	SEC filing ↗ May 18, 2026	▾
10	Polunin Capital Partners Ltd CIK 1629869 · View history	$31.81M 763,318 shares	8.25%	+763.32KNew	SEC filing ↗ Apr 15, 2026	▾
11	Invesco Ltd. CIK 914208 · Amended · View history	$30.97M 787,101 shares	0.00%	-555.03K(-41.40%)Reduced	SEC filing ↗ May 12, 2026	▾
12	SOUTHEASTERN ASSET MANAGEMENT INC/TN/ CIK 807985 · View history	$30.81M 782,900 shares	1.52%	-897.28K(-53.40%)Reduced	SEC filing ↗ May 15, 2026	▾
13	Qube Research & Technologies Ltd CIK 1729829 · View history	$28.51M 724,405 shares	0.04%	+578.35K(+396.00%)Added	SEC filing ↗ May 15, 2026	▾
14	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$28.29M 719,023 shares	0.01%	+485.28K(+207.60%)Added	SEC filing ↗ May 7, 2026	▾
15	Tekne Capital Management, LLC CIK 1558971 · View history	$28.14M 715,000 shares	11.89%	0(0.00%)Unchanged	SEC filing ↗ May 14, 2026	▾
16	Longaeva Partners L.P. CIK 2054122 · View history	$27.87M 708,379 shares	1.34%	+708.38KNew	SEC filing ↗ May 15, 2026	▾
17	FMR LLC CIK 315066 · View history	$24.76M 629,244 shares	0.00%	-174.42K(-21.70%)Reduced	SEC filing ↗ May 15, 2026	▾
18	CITIGROUP INC CIK 831001 · View history	$24.39M 619,892 shares	0.02%	+576.14K(+1,316.80%)Added	SEC filing ↗ May 11, 2026	▾
19	WEXFORD CAPITAL LP CIK 1048462 · View history	$23.58M 599,246 shares	3.89%	+264.24K(+78.90%)Added	SEC filing ↗ May 15, 2026	▾
20	Cederberg Capital Ltd CIK 1861244 · View history	$23.58M 599,200 shares	12.66%	-94.70K(-13.60%)Reduced	SEC filing ↗ May 15, 2026	▾

Showing 20 / 301 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

301

Cancelled or null records excluded

Disclosed shares

44,396,941

Not deduplicated across managers

Disclosed value

$1.74B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

ACM Research, Inc. · Q1 2026

Explore all 301 reporting institutions.

This page includes 20 of 301 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.