Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
521 institutional managers reported holding RIG for the quarter ended Mar 31, 2026. Together they hold about 80% of shares outstanding; the top 10 hold 40%. 130 opened new positions; 68 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 99.22M | 8.83% | $657.8M | added +2% | ≤2013 |
| BlackRock | 88.37M | 7.86% | $585.9M | unchanged | ≤2013 |
| Dimensional Fund Advisors | 48.82M | 4.34% | $323.7M | added +12.3% | ≤2013 |
| Two Sigma | 46.46M | 4.13% | $308.1M | added +91.7% | 2016 Q3 |
| D. E. Shaw | 39.26M | 3.49% | $260.3M | added +139% | 2020 Q2 |
| Slate Path Capital LP (focused) | 30.06M | 2.67% | $199.3M | opened | 2026 Q1 |
| Capital Group (American Funds) | 29.58M | 2.63% | $196.1M | added +88.8% | 2023 Q1 |
| State Street | 24.98M | 2.22% | $165.6M | added +1% | ≤2013 |
| Pilgrim Global Advisors LLC (focused) | 23.91M | 2.13% | $158.5M | trimmed -24.7% | 2024 Q3 |
| Geode Capital | 23.47M | 2.09% | $155.6M | added +3% | ≤2013 |
| American Century Companies INC | 22.76M | 2.02% | $150.9M | trimmed -17.2% | 2020 Q2 |
| Morgan Stanley | 21.69M | 1.93% | $143.8M | trimmed -12.5% | ≤2013 |
| VAN ECK Associates CORP | 21.14M | 1.88% | $140.1M | added +25.6% | ≤2013 |
| Dalal Street, LLC (focused) | 20.39M | 1.81% | $135.2M | trimmed -24.6% | 2025 Q3 |
| Voloridge Investment Management | 16.54M | 1.47% | $109.7M | opened | 2026 Q1 |
| Marshall Wace | 16.04M | 1.43% | $106.4M | added +42120.4% | 2022 Q2 |
| Elliott Investment Management (focused) | 15.63M | 1.39% | $103.6M | opened | 2026 Q1 |
| Goldman Sachs | 12.90M | 1.15% | $85.5M | trimmed -19.6% | ≤2013 |
| Keybank National ASSOCIATION/OH | 12.66M | 1.13% | $83.9M | added +3.3% | 2023 Q3 |
| Gendell Jeffrey L | 11.70M | 1.04% | $77.6M | added +8.4% | 2024 Q2 |
| FIL LTD | 11.24M | 1.00% | $74.5M | added +58296.9% | 2023 Q3 |
| Charles Schwab Investment Management | 9.81M | 0.87% | $65.0M | trimmed -1.9% | ≤2013 |
| Bank OF America CORP /DE/ | 8.60M | 0.77% | $57.0M | trimmed -44.5% | ≤2013 |
| Northern Trust | 8.14M | 0.72% | $54.0M | added +3.1% | ≤2013 |
| UBS | 7.53M | 0.67% | $49.9M | added +10.2% | ≤2013 |
| Driehaus Capital Management LLC | 7.21M | 0.64% | $47.8M | opened | 2026 Q1 |
| Susquehanna International Group | 6.23M | 0.55% | $41.3M | trimmed -29.7% | ≤2013 |
| BNY Mellon | 5.70M | 0.51% | $37.8M | added +67.8% | ≤2013 |
| Point72 | 5.41M | 0.48% | $35.8M | added +176.3% | 2023 Q4 |
| Tudor Investment | 5.28M | 0.47% | $35.0M | added +2897.5% | 2025 Q2 |
| CWA Asset Management Group, LLC | 5.20M | 0.46% | $34.5M | opened | 2026 Q1 |
| Cibc World Market INC. | 5.20M | 0.46% | $34.5M | trimmed -2% | 2021 Q1 |
| Millennium Management | 4.69M | 0.42% | $31.1M | trimmed -38.2% | ≤2013 |
| Empyrean Capital Partners, LP | 4.57M | 0.41% | $30.3M | opened | 2026 Q1 |
| ION Fund Management LTD | 4.49M | 0.40% | $29.8M | added +2.1% | 2025 Q4 |
| Nuveen | 4.48M | 0.40% | $29.7M | added +62.4% | 2014 Q1 |
| Solus Alternative Asset Management LP (focused) | 4.47M | 0.40% | $29.6M | unchanged | 2023 Q3 |
| Squarepoint Ops LLC | 4.21M | 0.37% | $27.9M | trimmed -22.3% | 2020 Q1 |
| FMR (Fidelity) | 3.93M | 0.35% | $26.1M | added +326.6% | ≤2013 |
| Clough Capital Partners L P | 3.61M | 0.32% | $23.9M | trimmed -21.1% | 2023 Q1 |
| Canoe Financial LP | 3.57M | 0.32% | $23.7M | opened | 2026 Q1 |
| Citadel Advisors | 3.51M | 0.31% | $23.3M | trimmed -49.8% | ≤2013 |
| AQR Capital | 3.28M | 0.29% | $21.7M | added +10.1% | 2014 Q4 |
| BNP Paribas Financial Markets | 3.27M | 0.29% | $21.7M | added +49.4% | ≤2013 |
| Rokos Capital Management LLP | 3.17M | 0.28% | $21.0M | opened | 2026 Q1 |
| Penn Capital Management Company, LLC | 3.15M | 0.28% | $20.9M | trimmed -16.1% | 2022 Q4 |
| Man Group | 3.15M | 0.28% | $20.9M | opened | 2026 Q1 |
| Renaissance Technologies | 3.13M | 0.28% | $20.8M | trimmed -65.3% | 2024 Q4 |
| Jump Financial | 3.10M | 0.28% | $20.5M | added +407% | 2021 Q1 |
| Trexquant Investment LP | 3.08M | 0.27% | $20.4M | opened | 2026 Q1 |
Largest 50 of 521 shown; the full ranked, searchable register is at boothcheck.com/holders/RIG. 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.