Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
289 institutional managers reported holding ACMR for the quarter ended Mar 31, 2026. Together they hold about 63% of shares outstanding; the top 10 hold 33%. 67 opened new positions; 50 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 7.98M | 11.45% | $313.9M | added +1.2% | 2018 Q2 |
| Vanguard Group | 4.88M | 7.00% | $192.0M | trimmed -1.8% | 2018 Q1 |
| State Street | 2.01M | 2.88% | $78.9M | added +2.5% | 2019 Q4 |
| WCM Investment Management | 1.86M | 2.67% | $73.2M | added +16878.8% | 2025 Q4 |
| Geode Capital | 1.37M | 1.97% | $53.9M | added +2.1% | 2018 Q2 |
| Morgan Stanley | 1.19M | 1.71% | $46.9M | trimmed -14.3% | 2018 Q1 |
| Janus Henderson | 1.09M | 1.56% | $42.7M | unchanged | 2019 Q4 |
| Value Aligned Research Advisors, LLC | 955.9k | 1.37% | $37.6M | opened | 2026 Q1 |
| Invesco | 787.1k | 1.13% | $30.9M | trimmed -41.4% | 2022 Q2 |
| Southeastern Asset Management INC/TN/ (focused) | 782.9k | 1.12% | $30.8M | trimmed -53.4% | 2025 Q2 |
| Polunin Capital Partners LTD (focused) | 763.3k | 1.09% | $30.0M | opened | 2026 Q1 |
| Qube Research & Technologies LTD | 724.4k | 1.04% | $28.5M | added +396% | 2024 Q1 |
| Dimensional Fund Advisors | 719.0k | 1.03% | $28.3M | added +207.6% | 2025 Q4 |
| Tekne Capital Management, LLC (focused) | 715.0k | 1.02% | $28.1M | unchanged | 2025 Q4 |
| Longaeva Partners L.p. | 708.4k | 1.01% | $27.8M | opened | 2026 Q1 |
| FMR (Fidelity) | 629.2k | 0.90% | $24.7M | trimmed -21.7% | 2022 Q2 |
| Citigroup INC | 619.9k | 0.89% | $24.4M | added +1316.8% | 2020 Q2 |
| Wexford Capital LP | 599.2k | 0.86% | $23.6M | added +78.9% | 2025 Q1 |
| Cederberg Capital LTD (focused) | 599.2k | 0.86% | $23.6M | added +20.7% | 2025 Q3 |
| Oxbow Capital Management (HK) LTD (focused) | 596.7k | 0.85% | $23.5M | opened | 2026 Q1 |
| Northern Trust | 562.5k | 0.81% | $22.1M | added +3.4% | 2018 Q2 |
| Goldman Sachs | 552.3k | 0.79% | $21.7M | added +52.7% | 2019 Q2 |
| LSV Asset Management | 545.3k | 0.78% | $21.4M | trimmed -77.1% | 2025 Q2 |
| UBS | 496.4k | 0.71% | $19.5M | trimmed -16.8% | 2017 Q4 |
| Charles Schwab Investment Management | 481.2k | 0.69% | $18.9M | added +0.6% | 2020 Q3 |
| Mitsubishi UFJ Asset Management CO., LTD. | 465.8k | 0.67% | $18.3M | trimmed -43.8% | 2020 Q3 |
| Bank OF America CORP /DE/ | 402.4k | 0.58% | $15.8M | added +33.4% | 2018 Q1 |
| Penn Capital Management Company, LLC | 397.8k | 0.57% | $15.6M | trimmed -8.7% | 2025 Q4 |
| Raiffeisen Bank International AG | 380.0k | 0.55% | $14.9M | trimmed -12.6% | 2024 Q4 |
| First Trust Advisors LP | 374.0k | 0.54% | $14.7M | added +73.7% | 2025 Q2 |
| Principal Financial Group INC | 340.7k | 0.49% | $13.4M | trimmed -11.1% | 2024 Q1 |
| Congress Asset Management CO | 339.9k | 0.49% | $13.4M | added +17.4% | 2025 Q2 |
| AQR Capital | 323.4k | 0.46% | $12.7M | trimmed -5.9% | 2022 Q4 |
| BNY Mellon | 314.6k | 0.45% | $12.4M | trimmed -3.2% | 2018 Q2 |
| Tidal Investments LLC | 313.8k | 0.45% | $12.3M | added +73.4% | 2025 Q2 |
| Oasis Management CO LTD. | 270.1k | 0.39% | $10.6M | added +15.4% | 2024 Q2 |
| NEW York State Common Retirement Fund | 259.4k | 0.37% | $10.2M | trimmed -14.5% | 2022 Q2 |
| Jacobs Levy Equity Management, INC | 244.3k | 0.35% | $9.6M | opened | 2026 Q1 |
| Kerrisdale Advisers, LLC | 223.8k | 0.32% | $8.8M | trimmed -15.1% | 2024 Q3 |
| Steamboat Capital Partners, LLC | 223.4k | 0.32% | $8.8M | trimmed -55.7% | 2024 Q1 |
| T. Rowe Price | 217.0k | 0.31% | $8.5M | added +358.2% | 2020 Q3 |
| Ameriprise Financial INC | 212.2k | 0.30% | $8.3M | trimmed -32.2% | 2022 Q3 |
| Wells Fargo & COMPANY/MN | 204.1k | 0.29% | $8.0M | added +144.2% | 2018 Q2 |
| Citadel Advisors | 203.4k | 0.29% | $8.0M | added +42.2% | 2019 Q2 |
| Public Sector Pension Investment Board | 190.6k | 0.27% | $7.5M | added +3.4% | 2025 Q3 |
| Storebrand Asset Management AS | 180.0k | 0.26% | $7.1M | opened | 2026 Q1 |
| Russell Investments Group, LTD. | 160.9k | 0.23% | $6.3M | trimmed -2.1% | 2023 Q1 |
| American Century Companies INC | 150.5k | 0.22% | $5.9M | trimmed -0.9% | 2023 Q2 |
| Rhumbline Advisers | 142.0k | 0.20% | $5.6M | added +2.8% | 2022 Q2 |
| Matthews International Capital Management LLC (focused) | 138.8k | 0.20% | $5.5M | trimmed -25.9% | 2021 Q3 |
Largest 50 of 289 shown; the full ranked, searchable register is at boothcheck.com/holders/ACMR. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.