ACMR
ACM Research, Inc. · Technology · Semiconductors
Momentum inputs (comparable managers):
holder breadth +7.1% ·
share flow -0.3% ·
net new positions +6.7%
— formula
Ownership fragmentation — more holders, smaller aggregate stake
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 110 | +18 | 33.41M | $4.22B | +22 | −3 |
| Q1 2026 | 94 | +3 | 30.41M | $1.19B | +10 | −8 |
| Q4 2025 | 92 | -2 | 30.05M | $1.19B | +1 | −2 |
| Q3 2025 | 17 | 0 | 19.46M | $761.29M | +2 | −3 |
| Q2 2025 | 15 | +1 | 12.95M | $335.52M | +2 | −1 |
| Q1 2025 | 11 | +3 | 4.40M | $102.74M | +3 | — |
| Q4 2024 | 8 | -2 | 3.56M | $53.70M | — | −2 |
| Q3 2024 | 9 | 0 | 2.94M | $59.78M | +1 | −1 |
| Q2 2024 | 9 | — | 3.63M | $83.63M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | The Vanguard Group ✦ (passive) | 4.30M | — | $111.28M | 0.0% | n/c | 1 | SEC ↗ |
| 2 | The Vanguard Group ✦ (passive) | 4.30M | — | $111.28M | 0.0% | n/c | 1 | SEC ↗ |
| 3 | The Vanguard Group ✦ (passive) | 4.30M | — | $111.28M | 0.0% | n/c | 1 | SEC ↗ |
| 4 | The Vanguard Group ✦ (passive) | 4.30M | — | $111.28M | 0.0% | n/c | 1 | SEC ↗ |
| 5 | The Vanguard Group ✦ (passive) | 4.30M | — | $111.28M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 15 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 16 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 17 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | BlackRock ✦ (passive) | 4.11M | — | $106.35M | 0.0% | n/c | 1 | SEC ↗ |
| 20 | State Street Global Advisors ✦ (passive) | 1.25M | +1.4% | $32.50M | 0.0% | ▲ Add | 3 | SEC ↗ |
| 21 | Geode Capital Management ✦ (passive) | 1.24M | +1.8% | $32.07M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 22 | Geode Capital Management ✦ (passive) | 1.24M | +1.8% | $32.07M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 23 | Millennium Management ✦ | 518.35K | +1187.0% | $13.43M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 24 | AQR Capital Management ✦ | 413.37K | +69.5% | $10.71M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 25 | AQR Capital Management ✦ | 413.37K | +69.5% | $10.71M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 26 | AQR Capital Management ✦ | 413.37K | +69.5% | $10.71M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 27 | AQR Capital Management ✦ | 413.37K | +69.5% | $10.71M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 28 | Point72 Asset Management ✦ | 252.27K | -73.0% | $6.53M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 29 | Marshall Wace ✦ | 234.21K | +527.3% | $6.07M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 30 | Marshall Wace ✦ | 234.21K | +527.3% | $6.07M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 31 | Citadel Advisors ✦ | 204.02K | -55.0% | $5.28M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 32 | Citadel Advisors ✦ | 204.02K | -55.0% | $5.28M | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 33 | Fidelity (FMR) ✦ | 183.19K | — | $4.74M | 0.0% | n/c | 1 | SEC ↗ |
| 34 | Fidelity (FMR) ✦ | 183.19K | — | $4.74M | 0.0% | n/c | 1 | SEC ↗ |
| 35 | Dodge & Cox ✦ | 81.09K | +28.5% | $2.10M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 36 | Gotham Asset Management ✦ | 64.75K | New | $1.68M | 0.0% | New | 1 | SEC ↗ |
| 37 | T. Rowe Price ✦ | 42.09K | +8.6% | $1.09M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 38 | Renaissance Technologies ✦ | 37.00K | New | $958,300 | 0.0% | New | 1 | SEC ↗ |
| 39 | Norges Bank ✦ (passive) | 28.53K | 0.0% | $738,875 | 0.0% | Held | 5 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Gotham Asset Management | $1.68M | 0.0% |
| Renaissance Technologies | $958,300 | 0.0% |
Exited
| D. E. Shaw & Co. | $2.53M | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 298 holders, 44.10M shares, $1.62B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Officer · 13.62K sh · $1.04M
Officer · 30.36K sh · $2.35M
Officer · 11.21K sh · $873,069
Director · 1.20K sh · $96,348
Director · 3.40K sh · $276,454
Director · 400 sh · $32,868
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology