Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ACMR held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 8.0M | $314.2M | +1.2% | 12.057% | 0.01% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 2.3M | $89.1M | — | 3.419% | 0.00% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2.2M | $86.7M | — | 3.328% | 0.00% |
| 4 | STATE STREET CORP | 2.0M | $78.9M | +2.5% | 3.029% | 0.00% |
| 5 | WCM INVESTMENT MANAGEMENT, LLC | 1.9M | $70.6M | +16878.8% | 2.810% | 0.16% |
| 6 | CITIGROUP INC | 1.6M | $62.6M | +3538.4% | 2.404% | 0.03% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 1.4M | $54.0M | +2.1% | 2.071% | 0.00% |
| 8 | MORGAN STANLEY | 1.2M | $46.9M | -14.3% | 1.801% | 0.00% |
| 9 | JANUS HENDERSON GROUP PLC | 1.1M | $42.7M | +0.2% | 1.639% | 0.02% |
| 10 | Value Aligned Research Advisors, LLC | 956K | $37.6M | — | 1.444% | 0.18% |
| 11 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 926K | $36.4M | -28.4% | 1.398% | 0.00% |
| 12 | Invesco Ltd. | 787K | $31.0M | -41.3% | 1.188% | 0.00% |
| 13 | SOUTHEASTERN ASSET MANAGEMENT INC/TN/ | 783K | $30.8M | -53.4% | 1.182% | 1.52% |
| 14 | Qube Research & Technologies Ltd | 724K | $28.5M | +396.0% | 1.094% | 0.03% |
| 15 | DIMENSIONAL FUND ADVISORS LP | 719K | $28.3M | +207.6% | 1.086% | 0.01% |
| 16 | Tekne Capital Management, LLC | 715K | $28.1M | 0.0% | 1.080% | 11.89% |
| 17 | Longaeva Partners L.P. | 708K | $27.9M | — | 1.070% | 1.46% |
| 18 | FMR LLC | 629K | $24.8M | -21.7% | 0.950% | 0.00% |
| 19 | WEXFORD CAPITAL LP | 599K | $23.6M | +78.9% | 0.905% | 3.89% |
| 20 | Oxbow Capital Management (HK) Ltd | 597K | $23.5M | — | 0.901% | 6.33% |
| 21 | NORTHERN TRUST CORP | 563K | $22.1M | +3.4% | 0.849% | 0.00% |
| 22 | CITADEL ADVISORS LLC | 556K | $21.9M | -12.0% | 0.839% | 0.01% |
| 23 | GOLDMAN SACHS GROUP INC | 552K | $21.7M | +52.7% | 0.834% | 0.00% |
| 24 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 481K | $18.9M | +0.6% | 0.727% | 0.00% |
| 25 | Mitsubishi UFJ Trust & Banking Corp | 466K | $18.3M | -43.8% | 0.703% | 0.05% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in ACMR — a direct measure of their conviction.
Filings activity in ACMR during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 299 | +9.5% | 27.33% | 0.17 pp | $1.70B | 0.6% |
| Q4 2025 | 273 | +9.2% | 27.50% | +1.49 pp | $1.71B | +5.7% |
| Q3 2025 | 250 | +5.0% | 26.01% | +9.90 pp | $1.62B | +61% |
| Q2 2025 | 238 | +2.1% | 16.11% | +2.26 pp | $1.00B | +16% |
| Q1 2025 | 233 | +32% | 13.85% | +5.34 pp | $862M | +63% |
| Q4 2024 | 177 | +0.6% | 8.51% | 1.84 pp | $529M | 18% |
| Q3 2024 | 176 | 11% | 10.35% | 1.96 pp | $644M | 16% |
| Q2 2024 | 197 | — | 12.31% | — | $766M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ACMR stock.
Based on Q1 2026 13F filings, institutional ownership of ACM Research, Inc. stands at 27.3%, held across 299 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ACMR, with approximately 7,984,847 shares worth $0.31B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of ACMR, including SUSQUEHANNA INTERNATIONAL GROUP, LLP, CITADEL ADVISORS LLC.
Our composite Smart Money Score for ACMR is 62 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
78 institutions opened new positions in ACMR during Q1 2026, while 52 fully exited. 74 added to existing positions and 144 trimmed.
ACMR institutional ownership fell by 0.17 percentage points quarter-over-quarter, with a net change of +26 holders.
The top 10 institutions account for 52.0% of all reported 13F value in ACMR, and the top 25 account for 74.6%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
ACM Research, Inc. (ACMR) Institutional Ownership