Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
180 institutional managers reported holding ATAT for the quarter ended Mar 31, 2026. Together they hold about 17% of shares outstanding; the top 10 hold 9%. 40 opened new positions; 43 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| OLP Capital Management LTD (focused) | 8.11M | 1.93% | $298.5M | trimmed -6.3% | 2023 Q4 |
| FMR (Fidelity) | 4.88M | 1.16% | $179.6M | unchanged | 2024 Q1 |
| WFM Asia (BVI) LTD (focused) | 3.68M | 0.88% | $135.5M | added +16.7% | 2025 Q1 |
| Aspex Management (HK) LTD (focused) | 3.55M | 0.85% | $130.8M | unchanged | 2023 Q4 |
| Schroder Investment Management Group | 3.46M | 0.83% | $127.4M | added +27.4% | 2023 Q3 |
| Vanguard Group | 2.88M | 0.69% | $105.9M | trimmed -15.7% | 2024 Q1 |
| M&G PLC | 2.81M | 0.67% | $103.5M | unchanged | 2024 Q2 |
| Greenwoods Asset Management Hong Kong LTD. (focused) | 2.59M | 0.62% | $95.4M | added +13.1% | 2025 Q2 |
| Bank OF America CORP /DE/ | 2.41M | 0.58% | $88.9M | trimmed -28.7% | 2023 Q1 |
| Mitsubishi UFJ Asset Management CO., LTD. | 2.26M | 0.54% | $83.2M | added +28.8% | 2024 Q2 |
| Renaissance Technologies | 2.15M | 0.51% | $79.3M | trimmed -1.1% | 2023 Q3 |
| BlackRock | 1.97M | 0.47% | $72.4M | added +13% | 2023 Q2 |
| Millennium Management | 1.39M | 0.33% | $51.1M | added +195.1% | 2023 Q3 |
| UBS | 1.29M | 0.31% | $47.6M | added +6.6% | 2023 Q1 |
| Man Group | 1.22M | 0.29% | $45.0M | added +18.2% | 2024 Q1 |
| Ameriprise Financial INC | 1.02M | 0.24% | $37.5M | added +57.4% | 2025 Q1 |
| Principal Financial Group INC | 978.0k | 0.23% | $36.0M | added +19.9% | 2023 Q4 |
| Cederberg Capital LTD (focused) | 900.6k | 0.21% | $33.2M | added +42.8% | 2025 Q3 |
| Think Investments LP (focused) | 897.5k | 0.21% | $33.0M | unchanged | 2024 Q4 |
| Qube Research & Technologies LTD | 891.2k | 0.21% | $32.8M | added +11.1% | 2024 Q4 |
| Goldman Sachs | 832.8k | 0.20% | $30.7M | trimmed -33.8% | 2023 Q2 |
| Broad Peak Investment Advisers Pte LTD (focused) | 806.0k | 0.19% | $29.7M | unchanged | 2025 Q4 |
| T. Rowe Price | 767.5k | 0.18% | $28.3M | added +1496.1% | 2023 Q2 |
| Aberdeen Group plc | 760.7k | 0.18% | $28.0M | trimmed -6.6% | 2025 Q1 |
| Prudential PLC | 715.3k | 0.17% | $26.3M | added +11.2% | 2024 Q2 |
| Marshall Wace | 708.0k | 0.17% | $26.1M | opened | 2026 Q1 |
| Bank OF Montreal /CAN/ | 693.1k | 0.17% | $25.5M | trimmed -5.3% | 2025 Q4 |
| American Century Companies INC | 688.1k | 0.16% | $25.3M | trimmed -36.3% | 2024 Q3 |
| Morgan Stanley | 673.6k | 0.16% | $24.8M | trimmed -43.6% | 2022 Q4 |
| Mawer Investment Management LTD. | 648.1k | 0.15% | $23.9M | added +35.2% | 2025 Q4 |
| Balyasny Asset Management | 621.5k | 0.15% | $22.9M | opened | 2023 Q3 |
| SG Americas Securities, LLC | 581.9k | 0.14% | $21.4M | trimmed -17.2% | 2024 Q1 |
| Triata Capital LTD (focused) | 565.2k | 0.14% | $20.8M | trimmed -15% | 2024 Q4 |
| Oversea-chinese Banking CORP LTD | 531.0k | 0.13% | $19.5M | added +65.3% | 2023 Q4 |
| E Fund Management CO., LTD. | 450.0k | 0.11% | $16.6M | opened | 2026 Q1 |
| AllianceBernstein | 447.0k | 0.11% | $16.5M | added +4.2% | 2024 Q3 |
| Public Sector Pension Investment Board | 436.4k | 0.10% | $16.1M | opened | 2026 Q1 |
| Lazard Asset Management LLC | 434.6k | 0.10% | $16.0M | added +3.6% | 2023 Q4 |
| Capital Wealth Planning, LLC | 388.7k | 0.09% | $14.3M | trimmed -1.3% | 2025 Q3 |
| CI Investments INC. | 381.1k | 0.09% | $14.0M | opened | 2026 Q1 |
| BNY Mellon | 340.2k | 0.08% | $12.5M | trimmed -17.5% | 2025 Q1 |
| Arrowstreet Capital | 339.0k | 0.08% | $12.5M | trimmed -51.8% | 2024 Q3 |
| Voloridge Investment Management | 330.5k | 0.08% | $12.2M | trimmed -3% | 2024 Q2 |
| Trexquant Investment LP | 328.6k | 0.08% | $12.1M | added +74.1% | 2024 Q2 |
| ABN Amro Investment Solutions | 314.7k | 0.07% | $11.6M | added +48.5% | 2024 Q2 |
| Point72 | 309.6k | 0.07% | $11.4M | opened | 2025 Q3 |
| Monolith Management LTD (focused) | 305.5k | 0.07% | $11.2M | added +42.9% | 2024 Q4 |
| Lighthouse Investment Partners, LLC | 301.2k | 0.07% | $11.1M | opened | 2025 Q3 |
| AI-Squared Management LTD (focused) | 295.7k | 0.07% | $10.9M | added +106.8% | 2023 Q4 |
| Two Sigma | 286.8k | 0.07% | $10.6M | added +273.4% | 2023 Q2 |
Largest 50 of 180 shown; the full ranked, searchable register is at boothcheck.com/holders/ATAT. 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.