Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
590 institutional managers reported holding OVV for the quarter ended Mar 31, 2026. Together they hold about 91% of shares outstanding; the top 10 hold 51%. 126 opened new positions; 72 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 29.93M | 11.16% | $1.78B | added +7.5% | 2020 Q1 |
| BlackRock | 26.74M | 9.97% | $1.59B | added +5.7% | 2020 Q1 |
| FMR (Fidelity) | 23.77M | 8.86% | $1.41B | added +14% | 2020 Q1 |
| Dimensional Fund Advisors | 10.55M | 3.93% | $626.0M | trimmed -4.6% | 2020 Q1 |
| State Street | 9.98M | 3.72% | $592.4M | added +14% | 2020 Q1 |
| Hotchkis & Wiley Capital Management LLC | 8.50M | 3.17% | $504.7M | trimmed -3.1% | 2022 Q3 |
| Arrowstreet Capital | 7.88M | 2.94% | $467.8M | added +16.9% | 2024 Q1 |
| T. Rowe Price | 7.21M | 2.69% | $428.1M | added +15.2% | 2020 Q1 |
| Invesco | 6.93M | 2.58% | $411.5M | added +446.3% | 2020 Q1 |
| Citadel Advisors | 5.92M | 2.21% | $351.6M | added +25.4% | 2020 Q1 |
| Millennium Management | 5.86M | 2.18% | $347.6M | added +2.9% | 2020 Q1 |
| Geode Capital | 5.37M | 2.00% | $318.5M | added +13.2% | 2020 Q1 |
| Capital Research Global Investors | 5.36M | 2.00% | $318.3M | opened | 2026 Q1 |
| Adage Capital Partners GP, L.l.c. | 4.91M | 1.83% | $291.3M | trimmed -10.2% | 2024 Q2 |
| Merewether Investment Management, LP | 4.28M | 1.60% | $254.3M | added +18.6% | 2025 Q1 |
| Mackenzie Financial CORP | 3.38M | 1.26% | $200.4M | added +79.7% | 2021 Q2 |
| BNY Mellon | 2.95M | 1.10% | $174.9M | added +8.8% | 2020 Q1 |
| Charles Schwab Investment Management | 2.66M | 0.99% | $157.7M | trimmed -73.1% | 2020 Q2 |
| AQR Capital | 2.52M | 0.94% | $149.6M | trimmed -26.5% | 2021 Q1 |
| Northern Trust | 2.40M | 0.89% | $142.4M | added +11.4% | 2020 Q1 |
| Point72 | 1.95M | 0.73% | $115.9M | trimmed -56.5% | 2020 Q2 |
| Qube Research & Technologies LTD | 1.83M | 0.68% | $108.5M | added +18% | 2023 Q4 |
| American Century Companies INC | 1.79M | 0.67% | $106.0M | added +70.7% | 2020 Q1 |
| Allianz Asset Management GmbH | 1.72M | 0.64% | $102.0M | trimmed -3.5% | 2020 Q1 |
| Alyeska Investment Group | 1.71M | 0.64% | $101.5M | trimmed -24.9% | 2020 Q4 |
| Morgan Stanley | 1.58M | 0.59% | $93.9M | trimmed -1% | 2020 Q1 |
| UBS | 1.53M | 0.57% | $91.0M | added +3.1% | 2020 Q1 |
| First Trust Advisors LP | 1.48M | 0.55% | $88.0M | added +74.2% | 2020 Q1 |
| Freestone Grove Partners LP | 1.31M | 0.49% | $77.9M | trimmed -57.3% | 2024 Q4 |
| Bank OF America CORP /DE/ | 1.23M | 0.46% | $73.2M | added +52.4% | 2020 Q1 |
| Two Sigma | 1.22M | 0.46% | $72.6M | added +62.3% | 2023 Q4 |
| Voloridge Investment Management | 1.19M | 0.44% | $70.4M | trimmed -22.3% | 2024 Q1 |
| Victory Capital Management INC | 1.17M | 0.44% | $69.3M | added +56.1% | 2020 Q2 |
| Goldman Sachs | 1.14M | 0.43% | $67.9M | added +160.2% | 2020 Q1 |
| Deutsche Bank AG\ | 1.13M | 0.42% | $66.9M | added +1394.6% | 2020 Q2 |
| Wellington Management | 1.11M | 0.41% | $65.7M | added +44.5% | 2020 Q1 |
| Yaupon Capital Management LP | 1.10M | 0.41% | $65.1M | trimmed -34.8% | 2021 Q3 |
| MFS Investment Management | 1.04M | 0.39% | $62.0M | opened | 2026 Q1 |
| Sourcerock Group LLC (focused) | 942.0k | 0.35% | $55.9M | added +98.5% | 2025 Q4 |
| Goldentree Asset Management LP (focused) | 825.5k | 0.31% | $49.0M | trimmed -47.4% | 2025 Q4 |
| Schroder Investment Management Group | 804.0k | 0.30% | $47.7M | added +77.5% | 2020 Q1 |
| Royal Bank OF Canada | 796.3k | 0.30% | $47.3M | added +34.2% | 2020 Q1 |
| VAN ECK Associates CORP | 781.5k | 0.29% | $46.4M | opened | 2026 Q1 |
| Webs Creek Capital Management LP (focused) | 775.2k | 0.29% | $46.0M | trimmed -40.5% | 2024 Q4 |
| Rhumbline Advisers | 737.5k | 0.28% | $43.8M | added +11.6% | 2020 Q2 |
| Gw&k Investment Management, LLC | 734.5k | 0.27% | $43.6M | trimmed -1.8% | 2022 Q1 |
| Callodine Capital Management, LP | 733.8k | 0.27% | $43.6M | added +1203.2% | 2025 Q3 |
| Evergreen Capital Management LLC | 732.3k | 0.27% | $43.5M | unchanged | 2024 Q3 |
| Systematic Financial Management LP | 720.7k | 0.27% | $42.8M | trimmed -2.4% | 2021 Q2 |
| Intact Investment Management INC. | 680.8k | 0.25% | $40.4M | opened | 2026 Q1 |
Largest 50 of 590 shown; the full ranked, searchable register is at boothcheck.com/holders/OVV. 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.