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Equibles

ACMR

ACM Research, Inc.

Company with tickers: ACMR

CIK
1680062
CUSIP
00108J109
Shares Outstanding
64,117,679
13F Activity (30d)
18 filings 14 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 305
Total Value: $1,799,988,091
Total Shares: 45,743,031
Showing 1–100 of 321 holdings by value · page 1 of 4

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 305 13F filers · Δ vs Dec 31, 2025
Top Holder
17.5%
Jun 2023 → Mar 2026 · range 10.5% – 17.5%
+1.5 pts
Top 5
34.3%
Jun 2023 → Mar 2026 · range 32.0% – 40.6%
−4.4 pts
Top 10
46.4%
Jun 2023 → Mar 2026 · range 46.4% – 57.4%
−6.6 pts
HHI
455
Jun 2023 → Mar 2026 · range 367 – 522
Broadly held−36

Quarterly Activity

vs Dec 31, 2025
New
71
Increased
83
Decreased
111
Sold Out
52
Unchanged
40
Holder count: +19
Institutional value: -7.6%
Shares held: -7.4%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Large WCM INVESTMENT MANAGEMENT, LLC +1,849,914 1,860,874
Mega CITIGROUP INC +1,548,140 1,591,892
Large Qube Research & Technologies Ltd +578,346 724,405
Mega DIMENSIONAL FUND ADVISORS LP +485,282 719,023
Large Tidal Investments LLC +266,239 628,115

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Large LSV ASSET MANAGEMENT −1,835,214 545,307
Mid SOUTHEASTERN ASSET MANAGEMENT INC/TN/ −897,281 782,900
Large PEAK6 LLC −587,800 235,700
Mega Invesco Ltd. −555,035 787,101
Mega JANE STREET GROUP, LLC −379,500 414,700

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 2,264,337 $89,101,660
Large Value Aligned Research Advisors, LLC 956,027 $37,619,662
Small Polunin Capital Partners Ltd 763,318 $30,036,563
Mid Longaeva Partners L.P. 708,379 $27,874,713
Small Oxbow Capital Management (HK) Ltd 596,689 $23,479,712

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 4,972,103 $196,149,462
Small Triata Capital Ltd 1,929,919 $76,135,304
Small Broad Bay Capital Management, LP 652,214 $25,729,842
Mid DISCOVERY CAPITAL MANAGEMENT, LLC / CT 296,200 $11,685,090
Small Yiheng Capital Management, L.P. 174,447 $6,881,934
Filter: New 71 Increased 83 Reduced 111 Sold out 52 Unchanged 40
Showing 100 of 321
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega BlackRock, Inc. $314,203,725 17.46% 7,984,847
Mega VANGUARD CAPITAL MANAGEMENT LLC $89,101,660 4.95% 2,264,337
Mega STATE STREET CORP $78,940,664 4.39% 2,006,116
Large WCM INVESTMENT MANAGEMENT, LLC $73,225,391 4.07% 1,860,874
Mega GEODE CAPITAL MANAGEMENT, LLC $53,957,782 3.00% 1,371,227
Mega MORGAN STANLEY $46,932,937 2.61% 1,192,705
Mega JANUS HENDERSON GROUP PLC $42,719,697 2.37% 1,085,634
Large Value Aligned Research Advisors, LLC $37,615,727 2.09% 955,927
Mega Invesco Ltd. $30,972,423 1.72% 787,101
Mid SOUTHEASTERN ASSET MANAGEMENT INC/TN/ $30,807,115 1.71% 782,900
Small Polunin Capital Partners Ltd $30,036,563 1.67% 763,318
Large Qube Research & Technologies Ltd $28,505,336 1.58% 724,405
Mega DIMENSIONAL FUND ADVISORS LP $28,293,554 1.57% 719,023
Small Tekne Capital Management, LLC $28,135,250 1.56% 715,000
Mid Longaeva Partners L.P. $27,874,713 1.55% 708,379
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $26,258,255 1.46% 667,300
Mega FMR LLC $24,760,750 1.38% 629,244
Mega CITIGROUP INC $24,392,749 1.36% 619,892
Small WEXFORD CAPITAL LP $23,580,330 1.31% 599,246
Small Cederberg Capital Ltd $23,578,520 1.31% 599,200
Small Oxbow Capital Management (HK) Ltd $23,479,712 1.30% 596,689
Mega NORTHERN TRUST CORP Bank $22,135,750 1.23% 562,535
Mega GOLDMAN SACHS GROUP INC $21,733,161 1.21% 552,304
Large LSV ASSET MANAGEMENT $21,457,830 1.19% 545,307
Mega CITIGROUP INC $19,124,100 1.06% 486,000
Mega CITIGROUP INC $19,124,100 1.06% 486,000
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $18,935,967 1.05% 481,219
Large Mitsubishi UFJ Trust & Banking Corp $18,327,616 1.02% 465,759
Mega UBS Group AG $15,901,687 0.88% 404,109
Mega BANK OF AMERICA CORP /DE/ Bank $15,834,911 0.88% 402,412
Mid Penn Capital Management Company, LLC $15,652,092 0.87% 397,766
Mega JANE STREET GROUP, LLC $15,389,785 0.85% 391,100
Mid Raiffeisen Bank International AG Bank $14,953,000 0.83% 380,000
Mega FIRST TRUST ADVISORS LP $14,716,388 0.82% 373,987
Mega VANGUARD FIDUCIARY TRUST CO Bank $13,434,129 0.75% 341,401
Mega PRINCIPAL FINANCIAL GROUP INC $13,407,488 0.74% 340,724
Large CONGRESS ASSET MANAGEMENT CO $13,373,609 0.74% 339,863
Mega AQR CAPITAL MANAGEMENT LLC $12,726,261 0.71% 323,412
Mega Bank of New York Mellon Corp Bank $12,379,862 0.69% 314,609
Large Tidal Investments LLC $12,367,705 0.69% 314,300
Large Tidal Investments LLC $12,348,620 0.69% 313,815
Mega JPMORGAN CHASE & CO $11,709,494 0.65% 297,573
Mega CITADEL ADVISORS LLC $11,136,050 0.62% 283,000
Mid Oasis Management Co Ltd. $10,627,962 0.59% 270,088
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $10,208,806 0.57% 259,436
Large JACOBS LEVY EQUITY MANAGEMENT, INC $9,611,316 0.53% 244,252
Large PEAK6 LLC $9,266,925 0.51% 235,500
Small Kerrisdale Advisers, LLC $8,804,759 0.49% 223,755
Small Steamboat Capital Partners, LLC $8,790,435 0.49% 223,391
Mega PRICE T ROWE ASSOCIATES INC /MD/ $8,537,178 0.47% 216,955
Mega AMERIPRISE FINANCIAL INC $8,351,918 0.46% 212,247
Mega WELLS FARGO & COMPANY/MN $8,029,405 0.45% 204,051
Mega CITADEL ADVISORS LLC $8,002,923 0.44% 203,378
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $7,822,780 0.43% 198,800
Large Public Sector Pension Investment Board Pension $7,501,133 0.42% 190,626
Large STOREBRAND ASSET MANAGEMENT AS $7,083,000 0.39% 180,000
Large Point72 Asset Management, L.P. $6,559,645 0.36% 166,700
Large Russell Investments Group, Ltd. $6,332,710 0.35% 160,933
Mega AMERICAN CENTURY COMPANIES INC $5,924,103 0.33% 150,549
Mega RHUMBLINE ADVISERS $5,588,132 0.31% 142,011
Small MATTHEWS INTERNATIONAL CAPITAL MANAGEMENT LLC $5,462,370 0.30% 138,815
Large Point72 Asset Management, L.P. $5,442,105 0.30% 138,300
Large HRT FINANCIAL LP $5,089,056 0.28% 129,328
Mega Legal & General Group Plc $4,969,746 0.28% 126,296
Large RENAISSANCE TECHNOLOGIES LLC $4,824,310 0.27% 122,600
Mega Dodge & Cox $4,717,750 0.26% 119,892
Mega Nuveen, LLC $4,402,832 0.24% 111,889
Mega Swiss National Bank Bank $4,194,710 0.23% 106,600
Mid KENNEDY CAPITAL MANAGEMENT LLC $4,070,993 0.23% 103,456
Mid THOMPSON SIEGEL & WALMSLEY LLC $3,978,285 0.22% 101,100
Mega FRANKLIN RESOURCES INC $3,794,204 0.21% 96,422
Mid Nearwater Capital Markets, Ltd $3,706,770 0.21% 94,200
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $3,629,760 0.20% 92,243
Mid GROUP ONE TRADING LLC $3,597,652 0.20% 91,427
Small RPg Family Wealth Advisory, LLC $3,582,030 0.20% 91,030
Mid SEGALL BRYANT & HAMILL, LLC $3,461,383 0.19% 87,964
Large SEI INVESTMENTS CO $3,344,946 0.19% 85,005
Mid Portolan Capital Management, LLC $3,276,123 0.18% 83,256
Small Kendall Capital Management $3,271,204 0.18% 83,131
Mega LPL Financial LLC $3,267,545 0.18% 83,038
Small INTRINSIC EDGE CAPITAL MANAGEMENT LLC $3,148,000 0.17% 80,000
Mega DEUTSCHE BANK AG\ Bank $3,142,293 0.17% 79,855
Mid Y-Intercept (Hong Kong) Ltd $2,998,942 0.17% 76,212
Mid GILDER GAGNON HOWE & CO LLC $2,803,490 0.16% 71,245
Large MACKENZIE FINANCIAL CORP $2,789,088 0.15% 70,879
Mega CITADEL ADVISORS LLC $2,738,760 0.15% 69,600
Small Horiko Capital Management LLC $2,597,100 0.14% 66,000
Mega MILLENNIUM MANAGEMENT LLC $2,579,786 0.14% 65,560
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $2,484,204 0.14% 63,131
Small HUSSMAN STRATEGIC ADVISORS, INC. $2,479,050 0.14% 63,000
Mid Inspire Investing, LLC $2,467,717 0.14% 62,712
Mega VICTORY CAPITAL MANAGEMENT INC $2,365,643 0.13% 60,118
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $2,351,044 0.13% 59,747
Large WEALTH ENHANCEMENT ADVISORY SERVICES, LLC $2,328,496 0.13% 59,174
Mega ALLIANCEBERNSTEIN L.P. $2,283,992 0.13% 58,043
Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Pension $2,248,773 0.12% 57,148
Mid XTX Topco Ltd $2,221,937 0.12% 56,466
Large BESSEMER GROUP INC $2,200,963 0.12% 55,933
Large PRUDENTIAL FINANCIAL INC $2,128,835 0.12% 54,100
Large Quantinno Capital Management LP $2,121,948 0.12% 53,925

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