Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
373 institutional managers reported holding BTU for the quarter ended Mar 31, 2026. Together they hold about 93% of shares outstanding; the top 10 hold 59%. 71 opened new positions; 44 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 17.95M | 14.71% | $591.3M | added +0.7% | 2017 Q2 |
| Vanguard Group | 15.60M | 12.79% | $514.0M | added +2.9% | 2017 Q2 |
| State Street | 10.38M | 8.51% | $342.0M | added +8.9% | 2017 Q2 |
| Dimensional Fund Advisors | 6.23M | 5.11% | $205.4M | added +0.9% | 2017 Q3 |
| Renaissance Technologies | 5.93M | 4.86% | $195.5M | trimmed -3.3% | 2017 Q3 |
| American Century Companies INC | 4.58M | 3.75% | $150.9M | added +1% | 2022 Q1 |
| Geode Capital | 3.31M | 2.72% | $109.2M | added +14.6% | 2017 Q2 |
| MFS Investment Management | 2.91M | 2.38% | $95.9M | trimmed -4.6% | 2025 Q4 |
| Hudson Bay Capital | 2.24M | 1.83% | $73.7M | added +5.5% | 2024 Q2 |
| Morgan Stanley | 2.23M | 1.83% | $73.6M | trimmed -1.7% | 2017 Q2 |
| Charles Schwab Investment Management | 1.65M | 1.35% | $54.4M | trimmed -4.4% | 2017 Q2 |
| Forest Avenue Capital Management LP (focused) | 1.65M | 1.35% | $54.2M | added +40.2% | 2025 Q3 |
| Invesco | 1.59M | 1.31% | $52.5M | added +106.7% | 2017 Q2 |
| FIL LTD | 1.48M | 1.21% | $48.6M | opened | 2026 Q1 |
| Sourcerock Group LLC (focused) | 1.42M | 1.17% | $46.8M | trimmed -26.7% | 2025 Q2 |
| Northern Trust | 1.22M | 1.00% | $40.2M | added +2.3% | 2017 Q2 |
| Assenagon Asset Management S.a. | 1.21M | 0.99% | $39.9M | added +331.2% | 2025 Q4 |
| UBS | 1.07M | 0.88% | $35.2M | trimmed -49.5% | 2017 Q2 |
| BNY Mellon | 953.7k | 0.78% | $31.4M | trimmed -3.5% | 2017 Q2 |
| T. Rowe Price Investment Management, INC. | 912.7k | 0.75% | $30.1M | opened | 2026 Q1 |
| Jane Street | 897.9k | 0.74% | $29.6M | trimmed -61.3% | 2017 Q3 |
| Goldman Sachs | 866.9k | 0.71% | $28.6M | trimmed -11.5% | 2017 Q2 |
| Susquehanna International Group | 857.2k | 0.70% | $28.2M | added +35.4% | 2017 Q2 |
| Bridgeway Capital Management, LLC | 797.1k | 0.65% | $26.3M | trimmed -5.9% | 2025 Q1 |
| Empowered Funds, LLC | 740.8k | 0.61% | $24.4M | added +35% | 2025 Q1 |
| Allianz Asset Management GmbH | 717.3k | 0.59% | $23.6M | added +463.5% | 2024 Q2 |
| Qube Research & Technologies LTD | 643.0k | 0.53% | $21.2M | added +894.4% | 2025 Q1 |
| Principal Financial Group INC | 591.0k | 0.48% | $19.5M | added +2% | 2022 Q2 |
| T. Rowe Price | 583.7k | 0.48% | $19.2M | added +407.8% | 2017 Q3 |
| Franklin Resources | 559.8k | 0.46% | $18.4M | added +165.2% | 2022 Q1 |
| LSV Asset Management | 544.4k | 0.45% | $17.9M | trimmed -1.8% | 2023 Q4 |
| Gendell Jeffrey L | 506.6k | 0.41% | $16.7M | unchanged | 2022 Q1 |
| Deutsche Bank AG\ | 504.2k | 0.41% | $16.6M | added +2.3% | 2017 Q2 |
| Alta Fundamental Advisers LLC (focused) | 500.0k | 0.41% | $16.5M | trimmed -7.8% | 2024 Q2 |
| Empire Life Investments INC. | 493.4k | 0.40% | $16.3M | added +8.5% | 2022 Q3 |
| Connor, Clark & Lunn Investment Management LTD. | 464.9k | 0.38% | $15.3M | trimmed -20.5% | 2022 Q2 |
| AQR Capital | 445.3k | 0.36% | $14.7M | added +12.2% | 2021 Q1 |
| Public Sector Pension Investment Board | 435.0k | 0.36% | $14.3M | added +3.4% | 2024 Q1 |
| Trek Financial, LLC | 360.0k | 0.29% | $11.9M | opened | 2026 Q1 |
| Envestnet Asset Management INC | 357.2k | 0.29% | $11.8M | added +23% | 2025 Q3 |
| Prudential Financial INC | 356.9k | 0.29% | $11.8M | added +28.7% | 2022 Q1 |
| Apis Capital Advisors, LLC | 350.0k | 0.29% | $11.5M | added +12.9% | 2025 Q4 |
| Nomura Asset Management International INC. | 346.1k | 0.28% | $11.4M | added +16% | 2025 Q3 |
| Federated Hermes, INC. | 342.0k | 0.28% | $11.3M | unchanged | 2017 Q3 |
| Arrowstreet Capital | 328.1k | 0.27% | $10.8M | added +1139.3% | 2025 Q2 |
| VAN ECK Associates CORP | 319.5k | 0.26% | $10.5M | added +38.1% | 2025 Q4 |
| Rhumbline Advisers | 302.1k | 0.25% | $10.0M | added +0.8% | 2017 Q2 |
| Citadel Advisors | 289.6k | 0.24% | $9.5M | opened | 2026 Q1 |
| AllianceBernstein | 276.8k | 0.23% | $9.1M | added +14.5% | 2017 Q2 |
| Nuveen | 270.3k | 0.22% | $8.9M | trimmed -11.9% | 2019 Q2 |
Largest 50 of 373 shown; the full ranked, searchable register is at boothcheck.com/holders/BTU. 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.