ACMR · ACM Research, Inc. · Holdings
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.
Institutional Ownership Trend
Superinvestors Holding ACMR
All superinvestors →Holder Concentration
Across 384 13F filersWho Holds ACMR
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 376 filers, like-for-like change +9.3%; actively managed books +16.0%; index-like books +3.3%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 45.1% | 193 | +14.1% |
| Exempt adviser | 1.1% | 5 | -62.6% |
| Adviser | 10.3% | 14 | +239.7% |
| Bank | 9.4% | 16 | -6.8% |
| Insurer | 0.9% | 2 | +6.0% |
| Broker-dealer | 0.5% | 2 | +43.5% |
| Benefit plan | 0.3% | 5 | -23.1% |
| Non-US | 1.1% | 9 | +14.3% |
| Holding company | 22.1% | 9 | +3.1% |
| Unknown | 9.3% | 121 | -22.6% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 38.1% | 39 | +3.3% |
| Systematic-like | 3.3% | 28 | +6.6% |
| Concentrated | 9.3% | 56 | +5.2% |
| Diversified active | 49.2% | 253 | +19.0% |
| Unknown | 0.0% | 0 | -100.0% |
| Not measured | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 51.9% | 203 | +8.6% |
| Medium turnover | 26.8% | 89 | +11.7% |
| High turnover | 6.6% | 53 | -9.3% |
| Unknown | 14.8% | 31 | +17.9% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 15.1% | 45 | -5.4% |
| Medium horizon | 24.8% | 57 | +12.0% |
| Long horizon | 55.1% | 240 | +20.1% |
| Unknown | 5.0% | 34 | -33.7% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 10.5% | 95 | +4.6% |
| $1B to $10B | 5.6% | 106 | -26.5% |
| $10B to $100B | 13.7% | 109 | -13.7% |
| $100B or more | 70.2% | 66 | +21.0% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 2.3% | 91 | +120.7% |
| Pooled investment vehicles | 12.9% | 36 | +43.3% |
| Registered funds and BDCs | 23.6% | 28 | +22.6% |
| Pension and profit sharing plans | 0.0% | 3 | +416.3% |
| Insurance companies | 0.1% | 3 | +36.8% |
| Governments and sovereign funds | 1.7% | 5 | -21.8% |
| Other investment advisers | 0.1% | 6 | +68.8% |
| Other | 0.1% | 2 | +11.8% |
| Diversified | 4.1% | 19 | -46.6% |
| Charitable organizations | 0.0% | 0 | — |
| Corporations | 0.0% | 0 | — |
| Unknown | 54.9% | 183 | +5.6% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 12.8% | 51 | +1.0% |
| Private equity funds | 1.7% | 10 | -3.6% |
| Venture capital funds | 0.0% | 1 | +6.1% |
| Real estate funds | 0.0% | 4 | +753.3% |
| Liquidity funds | 0.0% | 1 | new |
| Securitized asset funds | 0.3% | 1 | +58.7% |
| Other private funds | 6.4% | 22 | +5.7% |
| Mixed private funds | 2.0% | 3 | -48.2% |
| Private funds, type not stated | 0.1% | 7 | -58.5% |
| No private funds | 22.7% | 98 | +29.7% |
| Unknown | 53.8% | 178 | +9.7% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 88.7% | 310 | +11.0% |
| Outside the US | 11.3% | 66 | -2.6% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 3 holders with no observed 2026-03-31 13F and 4 holders with no observed 2026-06-30 13F. Compared across CIK changes: JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.
Conviction and Crowding
376 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $1,590,962 (1 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 49.5% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies ACMR's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | FINV FinVolution Group | 3 |
| 2 | ATAT Atour Lifestyle Holdings Ltd | 5 |
| 3 | SN SharkNinja, Inc. | 10 |
| 4 | RXO RXO, Inc. | 4 |
| 5 | AEHR Aehr Test Systems | 5 |
| 6 | POWL Powell Industries Inc | 9 |
| 7 | ADEA Adeia Inc. | 4 |
| 8 | HG Hamilton Insurance Group, Ltd. | 3 |
| 9 | BIDU Baidu, Inc. | 8 |
| 10 | LTM Latam Airlines Group S.A. | 3 |
Shareholder Targets
13F filers that own its peers but not ACMR, quarter ended Jun 30, 2026Found through its holder-overlap peers: FINV, ATAT, SN, RXO, AEHR, POWL, ADEA, HG, BIDU, LTM, LMB, QFIN, EC, CHEF, GDS, LASR, GHM, VNET, PAM, TSEM. 1,323 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | PRIMECAP MANAGEMENT CO/CA/ Registered adviser, Diversified active | $1,311,683,237 4 held | BIDU, SN, LASR |
| 2 | Clal Insurance Enterprises Holdings Ltd Unknown, Concentrated | $1,280,976,402 2 held | TSEM, SN |
| 3 | JANE STREET GROUP, LLC Unknown, Diversified active | $1,119,655,490 11 held | TSEM, POWL, AEHR |
| 4 | Orbis Allan Gray Ltd Unknown, Diversified active | $1,004,220,101 1 held | RXO |
| 5 | Phoenix Financial Ltd. Unknown, Diversified active | $914,044,619 2 held | TSEM, ADEA |
| 6 | MFN Partners Management, LP Registered adviser, Concentrated | $775,553,299 1 held | RXO |
| 7 | Harel Insurance Investments & Financial Services Ltd. Unknown, Diversified active | $594,097,342 1 held | TSEM |
| 8 | Magnitude Capital, LLC Registered adviser, Unknown | $512,390,143 1 held | HG |
| 9 | Senvest Management, LLC Registered adviser, Diversified active | $512,152,804 4 held | TSEM, VNET, LASR |
| 10 | Migdal Insurance & Financial Holdings Ltd. Holding company, Concentrated | $452,156,507 2 held | TSEM, SN |
Fund Ownership of ACMR by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 23.57% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 3.69% | 2,567,106 |
| Index ETFs | 19.88% | 13,846,220 |
| Active ETFs | 1.45% | 1,009,487 |
| Active funds | 8.92% | 6,215,755 |
| Unclassified | 0.86% | 602,196 |
| All registered funds | 34.80% | 24,240,764 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. Holding company | $1,098,974,235 | 16.60% | 8,660,842 | Shares | 2026-08-07 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $425,009,934 | 6.42% | 3,349,436 | Shares | 2026-08-13 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $312,497,713 | 4.72% | 2,462,745 | Shares | 2026-08-13 | |
| Mega Capital World Investors Adviser | $304,286,788 | 4.60% | 2,398,036 | Shares | 2026-08-12 | |
| Mega STATE STREET CORP Bank | $277,667,550 | 4.19% | 2,188,254 | Shares | 2026-09-22 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $188,786,560 | 2.85% | 1,487,797 | Shares | 2026-08-12 | |
| Mega JANE STREET GROUP, LLC | $156,937,552 | 2.37% | 1,236,800 | Call | 2026-08-14 | |
| Mega Invesco Ltd. Adviser | $148,471,448 | 2.24% | 1,170,080 | Shares | 2026-08-14 | |
| Large Value Aligned Research Advisors, LLC Registered adviser | $133,735,588 | 2.02% | 1,053,949 | Shares | 2026-08-17 | |
| Small WFM ASIA (BVI) Ltd Registered adviser | $122,981,788 | 1.86% | 969,200 | Shares | 2026-08-11 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $121,113,203 | 1.83% | 954,474 | Shares | 2026-08-11 | |
| Large WCM INVESTMENT MANAGEMENT, LLC Registered adviser | $116,440,734 | 1.76% | 917,651 | Shares | 2026-08-13 | |
| Large Tidal Investments LLC Registered adviser | $114,632,426 | 1.73% | 903,400 | Call | 2026-08-13 | |
| Small Tekne Capital Management, LLC Registered adviser | $93,581,375 | 1.41% | 737,500 | Shares | 2026-08-13 | |
| Mega MORGAN STANLEY Holding company | $88,846,470 | 1.34% | 700,185 | Shares | 2026-08-13 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $86,120,243 | 1.30% | 678,700 | Call | 2026-08-14 | |
| Mega FMR LLC Holding company | $85,293,426 | 1.29% | 672,184 | Shares | 2026-08-13 | |
| Large FULLER & THALER ASSET MANAGEMENT, INC. Registered adviser | $81,139,556 | 1.23% | 639,448 | Shares | 2026-08-12 | |
| Mid GILDER GAGNON HOWE & CO LLC Registered adviser | $80,836,289 | 1.22% | 637,058 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $80,808,119 | 1.22% | 636,836 | Shares | 2026-09-02 | |
| Mega Capital International Investors Adviser | $79,106,905 | 1.20% | 623,429 | Shares | 2026-08-12 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $75,064,697 | 1.13% | 591,573 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $72,216,396 | 1.09% | 569,126 | Shares | 2026-08-13 | |
| Mega Jupiter Topco LLC | $70,267,621 | 1.06% | 553,768 | Shares | 2026-08-14 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $66,840,576 | 1.01% | 526,760 | Shares | 2026-08-14 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $60,869,892 | 0.92% | 479,706 | Shares | 2026-08-14 | |
| Large Tidal Investments LLC Registered adviser | $59,757,195 | 0.90% | 470,937 | Shares | 2026-08-13 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $54,085,973 | 0.82% | 426,243 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $51,276,249 | 0.77% | 404,100 | Shares | 2026-08-13 | |
| Mega UBS Group AG Bank | $51,069,798 | 0.77% | 402,473 | Shares | 2026-08-13 | |
| Mega PRINCIPAL FINANCIAL GROUP INC Insurer | $47,065,150 | 0.71% | 370,913 | Shares | 2026-08-04 | |
| Mid Raiffeisen Bank International AG | $45,680,400 | 0.69% | 360,000 | Shares | 2026-08-03 | |
| Small WEXFORD CAPITAL LP Registered adviser | $45,096,706 | 0.68% | 355,400 | Shares | 2026-08-14 | |
| Large Mitsubishi UFJ Trust & Banking Corp Registered adviser | $44,564,274 | 0.67% | 351,204 | Shares | 2026-08-06 | |
| Mega Bank of New York Mellon Corp Bank | $41,402,173 | 0.63% | 326,284 | Shares | 2026-08-06 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $39,865,283 | 0.60% | 314,172 | Shares | 2026-08-14 | |
| Mega FIRST TRUST ADVISORS LP Registered adviser | $38,832,654 | 0.59% | 306,034 | Shares | 2026-08-11 | |
| Mid Penn Capital Management Company, LLC Registered adviser | $36,263,893 | 0.55% | 285,790 | Shares | 2026-07-30 | |
| Mega Qube Research & Technologies Ltd Exempt adviser | $35,531,103 | 0.54% | 280,015 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $35,376,932 | 0.53% | 278,800 | Call | 2026-09-02 | |
| Mid Oasis Management Co Ltd. Adviser | $34,834,477 | 0.53% | 274,525 | Shares | 2026-08-14 | |
| Large MACKENZIE FINANCIAL CORP Registered adviser | $34,007,027 | 0.51% | 268,004 | Shares | 2026-08-13 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $33,562,405 | 0.51% | 264,500 | Put | 2026-08-14 | |
| Small Cederberg Capital Ltd | $32,314,949 | 0.49% | 254,669 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $32,188,313 | 0.49% | 253,671 | Shares | 2026-08-14 | |
| Small MY.Alpha Management HK Advisors Ltd Exempt adviser | $31,659,055 | 0.48% | 249,500 | Shares | 2026-08-14 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $29,159,322 | 0.44% | 229,800 | Shares | 2026-08-13 | |
| Small 12 West Capital Management LP Registered adviser | $28,550,250 | 0.43% | 225,000 | Shares | 2026-08-14 | |
| Mega Russell Investments Group, Ltd. | $28,141,026 | 0.43% | 221,775 | Shares | 2026-08-06 | |
| Large Point72 Asset Management, L.P. Registered adviser | $28,093,446 | 0.42% | 221,400 | Call | 2026-08-14 | |
| Mega JPMORGAN CHASE & CO Bank | $27,262,694 | 0.41% | 214,853 | Shares | 2026-08-12 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $26,969,708 | 0.41% | 212,544 | Shares | 2026-08-14 | |
| Mega JANE STREET GROUP, LLC | $26,887,991 | 0.41% | 211,900 | Put | 2026-08-14 | |
| Mega CITIGROUP INC Bank | $26,627,231 | 0.40% | 209,845 | Shares | 2026-08-03 | |
| Large Point72 Asset Management, L.P. Registered adviser | $26,278,919 | 0.40% | 207,100 | Put | 2026-08-14 | |
| Large Public Sector Pension Investment Board Non-US | $24,871,962 | 0.38% | 196,012 | Shares | 2026-08-13 | |
| Large JACOBS LEVY EQUITY MANAGEMENT, INC Registered adviser | $24,358,565 | 0.37% | 191,966 | Shares | 2026-08-14 | |
| Large NEW YORK STATE COMMON RETIREMENT FUND | $24,303,876 | 0.37% | 191,535 | Shares | 2026-07-29 | |
| Small Steamboat Capital Partners, LLC Registered adviser | $23,192,065 | 0.35% | 182,773 | Shares | 2026-08-14 | |
| Mid Portolan Capital Management, LLC | $22,514,346 | 0.34% | 177,432 | Shares | 2026-08-14 | |
| Large CONGRESS ASSET MANAGEMENT CO Registered adviser | $22,426,978 | 0.34% | 277,150 | Shares | 2026-10-06 | |
| Mega WELLINGTON MANAGEMENT GROUP LLP Holding company | $22,204,099 | 0.34% | 174,987 | Shares | 2026-08-14 | |
| Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. Adviser | $21,485,268 | 0.32% | 169,322 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $20,188,199 | 0.30% | 159,100 | Put | 2026-09-02 | |
| Mid GROUP ONE TRADING LLC Broker-dealer | $19,928,835 | 0.30% | 157,056 | Shares | 2026-08-14 | |
| Mega Nuveen, LLC | $18,842,403 | 0.28% | 148,494 | Shares | 2026-08-11 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $18,578,468 | 0.28% | 146,414 | Shares | 2026-08-13 | |
| Mega FRANKLIN RESOURCES INC Adviser | $18,447,900 | 0.28% | 145,385 | Shares | 2026-08-13 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $17,828,171 | 0.27% | 140,501 | Shares | 2026-08-14 | |
| Mid SOUTHEASTERN ASSET MANAGEMENT INC/TN/ Registered adviser | $17,698,363 | 0.27% | 139,478 | Shares | 2026-08-14 | |
| Small MATTHEWS INTERNATIONAL CAPITAL MANAGEMENT LLC Registered adviser | $16,799,728 | 0.25% | 132,396 | Shares | 2026-07-31 | |
| Large PEAK6 LLC Broker-dealer | $16,647,968 | 0.25% | 131,200 | Call | 2026-08-13 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $16,366,145 | 0.25% | 128,979 | Shares | 2026-08-12 | |
| Mega Legal & General Group Plc | $15,939,794 | 0.24% | 125,619 | Shares | 2026-08-14 | |
| Small BRIGHT VALLEY CAPITAL Ltd | $14,973,020 | 0.23% | 118,000 | Shares | 2026-08-13 | |
| Mega Dodge & Cox Registered adviser | $14,768,980 | 0.22% | 116,392 | Shares | 2026-08-13 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $14,614,936 | 0.22% | 115,178 | Shares | 2026-08-14 | |
| Small Horiko Capital Management LLC Registered adviser | $13,530,026 | 0.20% | 106,628 | Shares | 2026-08-13 | |
| Mid THOMPSON SIEGEL & WALMSLEY LLC Registered adviser | $13,423,693 | 0.20% | 105,790 | Shares | 2026-08-11 | |
| Mega Swiss National Bank | $13,145,804 | 0.20% | 103,600 | Shares | 2026-08-11 | |
| Mega AMERICAN CENTURY COMPANIES INC | $12,841,268 | 0.19% | 101,200 | Shares | 2026-08-12 | |
| Small RPg Family Wealth Advisory, LLC | $12,456,283 | 0.19% | 98,166 | Shares | 2026-08-05 | |
| Mega LPL Financial LLC Broker-dealer | $11,837,314 | 0.18% | 93,288 | Shares | 2026-08-07 | |
| Mega DEUTSCHE BANK AG\ Non-US | $11,483,544 | 0.17% | 90,500 | Shares | 2026-08-07 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $10,955,682 | 0.17% | 86,340 | Shares | 2026-08-13 | |
| Large STOREBRAND ASSET MANAGEMENT AS | $10,215,913 | 0.15% | 80,510 | Shares | 2026-08-12 | |
| Small INTRINSIC EDGE CAPITAL MANAGEMENT LLC Registered adviser | $10,151,200 | 0.15% | 80,000 | Shares | 2026-08-12 | |
| Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Non-US | $9,488,580 | 0.14% | 74,778 | Shares | 2026-08-13 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $9,432,748 | 0.14% | 74,338 | Shares | 2026-08-14 | |
| Small Kendall Capital Management Registered adviser | $9,240,129 | 0.14% | 72,820 | Shares | 2026-08-12 | |
| Mid Aperture Investors, LLC Registered adviser | $8,954,500 | 0.14% | 70,569 | Shares | 2026-08-14 | |
| Large LAZARD ASSET MANAGEMENT LLC Adviser | $8,093,551 | 0.12% | 63,784 | Shares | 2026-08-14 | |
| Mid Atika Capital Management LLC | $7,994,069 | 0.12% | 63,000 | Shares | 2026-08-13 | |
| Mid Inspire Investing, LLC Registered adviser | $7,988,867 | 0.12% | 62,959 | Shares | 2026-08-12 | |
| Small Kerrisdale Advisers, LLC Registered adviser | $7,939,507 | 0.12% | 62,570 | Shares | 2026-08-14 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $7,575,586 | 0.11% | 59,702 | Shares | 2026-08-24 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $7,439,178 | 0.11% | 58,627 | Shares | 2026-08-14 | |
| Large PRUDENTIAL FINANCIAL INC Insurer | $7,423,699 | 0.11% | 58,505 | Shares | 2026-08-12 | |
| Large BESSEMER GROUP INC | $7,100,891 | 0.11% | 55,961 | Shares | 2026-08-12 | |
| Large Quantinno Capital Management LP Registered adviser | $6,879,722 | 0.10% | 54,218 | Shares | 2026-08-13 |
Showing the top 100 of 403 holders. Create a free account to see every holder, past quarters, search, filters and CSV export.