Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
232 institutional managers reported holding TNK for the quarter ended Mar 31, 2026. Together they hold about 59% of shares outstanding; the top 10 hold 31%. 48 opened new positions; 33 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Dimensional Fund Advisors | 1.90M | 5.47% | $139.4M | added +3.7% | 2014 Q1 |
| Mercuria Capital Strategies, LLC (focused) | 1.78M | 5.12% | $130.2M | opened | 2026 Q1 |
| FMR (Fidelity) | 1.66M | 4.77% | $121.3M | added +17.5% | 2018 Q3 |
| BlackRock | 1.51M | 4.35% | $110.7M | trimmed -10.9% | ≤2013 |
| American Century Companies INC | 990.0k | 2.85% | $72.5M | trimmed -2.3% | 2022 Q4 |
| Acadian Asset Management | 706.8k | 2.03% | $51.7M | added +144.9% | 2022 Q4 |
| Morgan Stanley | 614.3k | 1.77% | $45.0M | trimmed -18.3% | ≤2013 |
| Renaissance Technologies | 558.0k | 1.60% | $40.9M | unchanged | 2022 Q1 |
| Summit Street Capital Management, LLC (focused) | 471.1k | 1.35% | $34.5M | unchanged | 2025 Q2 |
| Geode Capital | 421.1k | 1.21% | $30.8M | added +17.4% | ≤2013 |
| Qube Research & Technologies LTD | 409.0k | 1.18% | $29.9M | added +46.2% | 2022 Q2 |
| State Street | 401.4k | 1.15% | $29.4M | unchanged | 2021 Q2 |
| CastleKnight Management LP | 390.3k | 1.12% | $28.6M | trimmed -32.2% | 2025 Q1 |
| Ameriprise Financial INC | 352.3k | 1.01% | $25.8M | trimmed -4.4% | ≤2013 |
| Fuller & Thaler Asset Management, INC. | 320.5k | 0.92% | $23.5M | unchanged | 2023 Q4 |
| Bridgeway Capital Management, LLC | 292.3k | 0.84% | $21.4M | added +7.8% | 2019 Q2 |
| Goldman Sachs | 261.3k | 0.75% | $19.1M | added +87.2% | ≤2013 |
| Citadel Advisors | 257.5k | 0.74% | $18.9M | added +17.4% | 2013 Q3 |
| Mizuho Markets Americas LLC | 250.0k | 0.72% | $18.3M | opened | 2026 Q1 |
| AQR Capital | 242.2k | 0.70% | $17.7M | added +28.1% | 2022 Q3 |
| Tudor Investment | 219.1k | 0.63% | $16.0M | added +94.1% | 2025 Q2 |
| Arrowstreet Capital | 217.5k | 0.63% | $15.9M | added +367.2% | 2022 Q3 |
| Vanguard Group | 213.0k | 0.61% | $15.6M | unchanged | ≤2013 |
| Northern Trust | 205.7k | 0.59% | $15.1M | added +4.1% | ≤2013 |
| Connor, Clark & Lunn Investment Management LTD. | 200.2k | 0.58% | $14.7M | added +290.5% | 2025 Q4 |
| Empowered Funds, LLC | 191.5k | 0.55% | $14.0M | added +21.1% | 2023 Q2 |
| Oceanic Investment Management LTD (focused) | 190.6k | 0.55% | $14.0M | added +417.6% | 2025 Q4 |
| Systematic Financial Management LP | 189.5k | 0.55% | $13.9M | trimmed -11.7% | 2023 Q3 |
| Hartree Partners, LP | 185.5k | 0.53% | $13.6M | added +25% | 2024 Q4 |
| Neos Investment Management LLC | 180.8k | 0.52% | $13.2M | added +1070.9% | 2025 Q4 |
| Point72 | 174.3k | 0.50% | $12.8M | added +48.8% | 2025 Q4 |
| Bank OF America CORP /DE/ | 173.7k | 0.50% | $12.7M | trimmed -17.3% | ≤2013 |
| Balyasny Asset Management | 170.5k | 0.49% | $12.5M | opened | 2026 Q1 |
| Russell Investments Group, LTD. | 166.8k | 0.48% | $12.2M | added +81.3% | 2019 Q1 |
| Man Group | 160.7k | 0.46% | $11.8M | added +63.1% | 2025 Q4 |
| Jacobs Levy Equity Management, INC | 152.5k | 0.44% | $11.2M | trimmed -13.7% | 2022 Q3 |
| Royce & Associates | 145.4k | 0.42% | $10.6M | trimmed -15.5% | 2024 Q4 |
| HRT Financial LP | 145.3k | 0.42% | $10.6M | added +53.8% | 2025 Q4 |
| Victory Capital Management INC | 124.9k | 0.36% | $9.1M | added +167.2% | 2023 Q2 |
| Trexquant Investment LP | 109.6k | 0.32% | $8.0M | added +13.6% | 2024 Q4 |
| UBS | 108.0k | 0.31% | $7.9M | trimmed -25% | ≤2013 |
| SEI Investments CO | 106.2k | 0.30% | $7.8M | added +155.7% | 2022 Q4 |
| Quantedge Capital Pte LTD | 104.7k | 0.30% | $7.7M | trimmed -2.9% | 2025 Q3 |
| Denali Advisors LLC | 100.7k | 0.29% | $7.4M | added +11.7% | 2024 Q4 |
| Two Sigma | 96.0k | 0.28% | $7.0M | opened | 2026 Q1 |
| Charles Schwab Investment Management | 90.5k | 0.26% | $6.6M | trimmed -6.5% | ≤2013 |
| Franklin Resources | 89.9k | 0.26% | $6.6M | added +35.8% | 2022 Q4 |
| CSM Advisors, LLC | 84.4k | 0.24% | $6.2M | added +18.3% | 2025 Q2 |
| Millennium Management | 82.8k | 0.24% | $6.1M | trimmed -43.4% | 2022 Q2 |
| Squarepoint Ops LLC | 82.4k | 0.24% | $6.0M | trimmed -14.9% | 2024 Q4 |
Largest 50 of 232 shown; the full ranked, searchable register is at boothcheck.com/holders/TNK. 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.