ACMR Institutional Ownership
Who owns ACM Research, Inc. and what the big funds did with it last quarter, from every SEC 13F filing. 379 funds reported holding ACMR at Jun 30, 2026.
- ▲242 buying vs 132 selling
- ▲Shares held by funds +9.3%
- ▲Funds holding +76
- ▲Superinvestors: 4 added, 0 cut
- ▲Put/call 0.48 to 0.19
What the filings show, not a forecast. Positions can be up to 45 days old and leave out short sales.
Funds holding and ownership
8 quartersQuarter over quarter
all 13F filers| Q2 2026 | This quarter | Q1 2026 | Change |
|---|---|---|---|
| Funds holding | 379 | 303 | +25.1% |
| In funds' top 10 | 14 | 6 | +133.3% |
| 13F shares | 48.6M | 44.5M | +9.3% |
| Held by funds | – | – | – |
| New positions | 118 | 65 | +81.5% |
| Increased | 124 | 84 | +47.6% |
| Reduced | 92 | 105 | −12.4% |
| Sold out | 40 | 45 | −11.1% |
| Calls (shares) | 1.2M | 478K | +160.1% |
| Puts (shares) | 237K | 231K | +2.6% |
| Put/call ratio | 0.19 | 0.48 | −60.6% |
Buyers vs sellers
adding or new vs cutting or sold outSuperinvestors in ACMR
All superinvestors →
Who owns ACMR
share of fund held shares- Index and passive funds45.9%
- Active managers and hedge funds42.4%
- Banks and brokers9.8%
- Pensions, insurers and other1.9%
The top 10 holders own 50.8% of all ACMR shares that funds reported. Groups are our own grouping of filers by name.
Put/call ratio
funds' options, market makers left outAbove 1 means funds hold more puts than calls, a sign of hedging or bets on a fall. Options are valued at the underlying shares.
Filed so far for Q3 2026
107 funds changed their position- Raiffeisen Bank International AGTrimmed−69K sh
- Congress Asset Management CoAdded+53K sh
- Hussman Strategic Advisors, Inc.New+42K sh
- Wasatch Advisors LPNew+29K sh
- CenterBook Partners LPTrimmed−23K sh
🔒 Free account: see all 20.
Top holders
Q2 2026| # | Fund | Of company | Shares | Value | Change |
|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | – | 8.7M | $1.1B | +676K |
| 2 | Vanguard Portfolio Management LLC | – | 3.3M | $425M | +1.1M |
| 3 | Vanguard Capital Management LLC | – | 2.5M | $312M | +198K |
| 4 | Capital World Investors | – | 2.4M | $304M | +2.4M |
| 5 | State Street Corp | – | 2.2M | $278M | +182K |
| 6 | Geode Capital Management, LLC | – | 1.5M | $189M | +117K |
| 7 | Invesco Ltd. | – | 1.2M | $148M | +383K |
| 8 | Value Aligned Research Advisors, LLC | – | 1.1M | $134M | +98K |
| 9 | WFM ASIA (BVI) Ltd | – | 969K | $123M | +969K |
| 10 | Dimensional Fund Advisors LP | – | 954K | $121M | +235K |
- Capital World Investors+2.4M sh+$304M
- Vanguard Portfolio Management LLC+1.1M sh+$145M
- WFM ASIA (BVI) Ltd+969K sh+$123M
- BlackRock, Inc.+676K sh+$85.8M
- Fuller & Thaler Asset Management, Inc.+639K sh+$81.1M
- Capital International Investors+623K sh+$79.1M
- Gilder Gagnon Howe & Co LLC+566K sh+$71.8M
- Citadel Advisors LLC+433K sh+$55M
- Wcm Investment Management, LLC−943K sh−$112M
- Longaeva Partners L.P.−691K sh−$87.6M
- Southeastern Asset Management Inc/tn/−643K sh−$81.6M
- Lsv Asset Management−533K sh−$67.6M
- Morgan Stanley−493K sh−$62.5M
- Qube Research & Technologies Ltd−444K sh−$56.4M
- Citigroup Inc−410K sh−$52M
- Cederberg Capital Ltd−345K sh−$43.7M
ACMR institutional ownership FAQ
Who owns the most ACMR stock?
In Q2 2026 13F filings the largest holder of ACMR was BlackRock, Inc., followed by Vanguard Portfolio Management LLC and Vanguard Capital Management LLC. Index fund managers are usually the biggest holders of large companies.
What percentage of ACMR is owned by institutions?
379 funds reported holding 48.6M ACMR shares at Jun 30, 2026.
Are hedge funds buying ACMR?
In Q2 2026, 242 funds bought ACMR (118 of them new positions) and 132 sold (40 sold out completely). Among well known investors, 4 added and 0 cut. Our fund sentiment for ACMR is strongly bullish.
What is ACMR's institutional put/call ratio?
Funds reported $30.1M of ACMR puts against $158M of calls, a put/call ratio of 0.19 (0.48 the quarter before). Market makers and bank trading desks are left out, since their options are mostly hedges.
How current is this ACMR ownership data?
13F filings show holdings at the end of each quarter and are due within 45 days, so positions can be up to six weeks old when they appear. We add each new filing within minutes, and the "filed so far" list shows funds that have already reported the next quarter.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Fund sentiment summarises what 13F filings show and is not a forecast. Holdings come from SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.