Southeastern Asset Management (Longleaf)
SuperinvestorSoutheastern Asset Management Inc
- SEC CIK
- 0000807985
- Manager
- Mason Hawkins
- Style
- Value
- Latest filing
- Aug 14, 2026
ACMR holding history
ACM Research, Inc. in every 13F filed by Southeastern Asset Management (Longleaf), including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.
ACMR overviewAll 13F holders of ACMRFull Q2 2026 holdings
- Shares (Q2 2026)
- 139,478
- Value
- $17.7M
- % of portfolio
- 0.9%
- Quarters held
- 5
- Since Q2 2025
| Quarter | Shares | Value | % of portfolio | Share change | Action | All holders |
|---|---|---|---|---|---|---|
| Q2 2026 | 139,478 | $17.7M | 0.9% | −643,422−82.2% | Reduced | Holders |
| Q1 2026 | 782,900 | $30.8M | 1.5% | −897,281−53.4% | Reduced | Holders |
| Q4 2025 | 1,680,181 | $66.3M | 3.0% | +194,494+13.1% | Added | Holders |
| Q3 2025 | 1,485,687 | $58.1M | 3.0% | +299,943+25.3% | Added | Holders |
| Q2 2025 | 1,185,744 | $30.7M | 1.5% | +1,185,744 | New | Holders |