Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
323 institutional managers reported holding INSW for the quarter ended Mar 31, 2026. Together they hold about 77% of shares outstanding; the top 10 hold 53%. 74 opened new positions; 33 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 6.27M | 12.61% | $456.8M | added +2.1% | 2016 Q4 |
| FMR (Fidelity) | 4.94M | 9.93% | $359.9M | added +5.7% | 2016 Q4 |
| Vanguard Group | 4.50M | 9.05% | $328.1M | added +4.7% | 2016 Q4 |
| Dimensional Fund Advisors | 3.02M | 6.08% | $220.5M | added +1.8% | 2016 Q4 |
| American Century Companies INC | 2.00M | 4.02% | $145.6M | added +2.7% | 2021 Q2 |
| Nomura Asset Management International INC. | 1.60M | 3.22% | $116.8M | trimmed -9.4% | 2025 Q4 |
| State Street | 1.56M | 3.14% | $113.7M | added +2.1% | 2016 Q4 |
| Geode Capital | 1.14M | 2.29% | $82.8M | added +12.4% | 2016 Q4 |
| Hosking Partners LLP | 686.9k | 1.38% | $50.1M | unchanged | 2017 Q4 |
| Charles Schwab Investment Management | 651.4k | 1.31% | $47.5M | added +2% | 2016 Q4 |
| Invesco | 647.9k | 1.30% | $47.2M | added +89.5% | 2018 Q1 |
| Arrowstreet Capital | 608.3k | 1.22% | $44.3M | added +167.6% | 2023 Q1 |
| Morgan Stanley | 593.5k | 1.19% | $43.3M | trimmed -13.6% | 2016 Q4 |
| Northern Trust | 414.6k | 0.83% | $30.2M | added +2.5% | 2016 Q4 |
| Bridgeway Capital Management, LLC | 414.6k | 0.83% | $30.2M | unchanged | 2024 Q4 |
| Frontier Capital Management CO LLC | 344.7k | 0.69% | $25.1M | added +25.1% | 2017 Q3 |
| CastleKnight Management LP | 286.8k | 0.58% | $20.9M | added +397.5% | 2025 Q2 |
| Goldman Sachs | 268.7k | 0.54% | $19.6M | trimmed -26.1% | 2017 Q1 |
| Empowered Funds, LLC | 268.2k | 0.54% | $19.5M | added +13.9% | 2023 Q1 |
| BNY Mellon | 267.8k | 0.54% | $19.5M | trimmed -2.9% | 2016 Q4 |
| AQR Capital | 263.2k | 0.53% | $19.2M | trimmed -7.1% | 2022 Q2 |
| Victory Capital Management INC | 260.2k | 0.52% | $19.0M | added +10.9% | 2019 Q3 |
| Citadel Advisors | 254.1k | 0.51% | $18.5M | added +29.9% | 2021 Q3 |
| Principal Financial Group INC | 252.7k | 0.51% | $18.4M | added +30.9% | 2020 Q4 |
| UBS | 241.6k | 0.49% | $17.6M | trimmed -9.7% | 2016 Q4 |
| Baird Financial Group, INC. | 236.7k | 0.48% | $17.3M | added +4.5% | 2025 Q1 |
| Private Management Group INC | 225.3k | 0.45% | $16.4M | trimmed -40.8% | 2021 Q4 |
| Allianz Asset Management GmbH | 199.7k | 0.40% | $14.6M | added +168.2% | 2025 Q4 |
| Jane Street | 186.3k | 0.38% | $13.6M | added +4.3% | 2022 Q1 |
| Public Sector Pension Investment Board | 186.1k | 0.37% | $13.6M | added +4.9% | 2024 Q4 |
| Acorn Financial Advisory Services INC /ADV | 180.4k | 0.36% | $13.1M | opened | 2026 Q1 |
| Clearbridge Investments, LLC | 180.2k | 0.36% | $13.1M | trimmed -18.7% | 2024 Q4 |
| First Trust Advisors LP | 175.6k | 0.35% | $12.8M | added +65.3% | 2022 Q4 |
| Tudor Investment | 169.8k | 0.34% | $12.4M | added +16.3% | 2025 Q4 |
| Envestnet Asset Management INC | 169.1k | 0.34% | $12.3M | added +5.1% | 2023 Q2 |
| Franklin Resources | 160.9k | 0.32% | $11.7M | added +244% | 2023 Q2 |
| Bank OF America CORP /DE/ | 157.2k | 0.32% | $11.5M | trimmed -6.8% | 2016 Q4 |
| Rhumbline Advisers | 111.7k | 0.23% | $8.1M | added +3.5% | 2016 Q4 |
| Loomis Sayles & CO L P | 111.6k | 0.23% | $8.1M | trimmed -51.2% | 2021 Q3 |
| Aristotle Capital Boston, LLC | 109.0k | 0.22% | $7.9M | trimmed -37% | 2021 Q3 |
| Legal & General Group PLC | 106.7k | 0.21% | $7.8M | trimmed -5.5% | 2016 Q4 |
| Bessemer Group INC | 102.9k | 0.21% | $7.5M | added +45.3% | 2024 Q2 |
| Susquehanna International Group | 100.9k | 0.20% | $7.4M | added +357.6% | 2021 Q3 |
| Connor, Clark & Lunn Investment Management LTD. | 98.7k | 0.20% | $7.2M | opened | 2026 Q1 |
| Millennium Management | 96.7k | 0.20% | $7.1M | added +7.2% | 2024 Q2 |
| Nuveen | 89.0k | 0.18% | $6.5M | trimmed -10.3% | 2019 Q2 |
| Swiss National Bank | 82.8k | 0.17% | $6.0M | unchanged | 2017 Q2 |
| Energy Income Partners, LLC | 82.3k | 0.17% | $6.0M | added +3.4% | 2024 Q3 |
| Qube Research & Technologies LTD | 79.9k | 0.16% | $5.8M | opened | 2026 Q1 |
| Renaissance Technologies | 79.0k | 0.16% | $5.8M | trimmed -46.5% | 2022 Q4 |
Largest 50 of 323 shown; the full ranked, searchable register is at boothcheck.com/holders/INSW. 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.