Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
183 institutional managers reported holding SBLK for the quarter ended Mar 31, 2026. Together they hold about 32% of shares outstanding; the top 10 hold 15%. 45 opened new positions; 32 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Two Sigma | 3.01M | 2.61% | $69.2M | added +435.7% | 2023 Q4 |
| Renaissance Technologies | 2.07M | 1.79% | $47.5M | added +13% | 2016 Q3 |
| Victory Capital Management INC | 1.92M | 1.66% | $44.1M | opened | 2026 Q1 |
| Philosophy Capital Management LLC (focused) | 1.87M | 1.62% | $43.0M | added +13.6% | 2024 Q3 |
| Goldman Sachs | 1.74M | 1.51% | $39.9M | added +173.5% | 2015 Q2 |
| Boston Partners | 1.63M | 1.41% | $37.3M | added +92.9% | 2022 Q3 |
| Morgan Stanley | 1.53M | 1.33% | $35.2M | added +40.2% | 2013 Q3 |
| Marshall Wace | 1.22M | 1.05% | $27.9M | added +1168.9% | 2025 Q4 |
| D. E. Shaw | 1.17M | 1.02% | $26.9M | added +1084% | 2025 Q4 |
| Focus Partners Wealth | 1.14M | 0.99% | $26.2M | added +9.5% | 2024 Q3 |
| Qube Research & Technologies LTD | 1.09M | 0.94% | $24.9M | opened | 2026 Q1 |
| Fearnley Asset Management AS (focused) | 951.2k | 0.82% | $21.8M | added +425.1% | 2025 Q4 |
| Cooper Creek Partners Management LLC | 866.0k | 0.75% | $19.9M | opened | 2026 Q1 |
| Allianz Asset Management GmbH | 799.4k | 0.69% | $18.4M | added +4.3% | 2024 Q2 |
| Point72 | 789.9k | 0.68% | $18.1M | trimmed -2.1% | 2025 Q4 |
| HRT Financial LP | 771.2k | 0.67% | $17.7M | added +1625.5% | 2025 Q4 |
| Arrowstreet Capital | 757.4k | 0.66% | $17.4M | opened | 2026 Q1 |
| DNB Asset Management AS | 743.8k | 0.64% | $17.1M | trimmed -9% | 2024 Q2 |
| Tudor Investment | 735.0k | 0.64% | $16.9M | opened | 2026 Q1 |
| Millennium Management | 719.5k | 0.62% | $16.5M | trimmed -18.9% | 2025 Q3 |
| BlackRock | 600.5k | 0.52% | $13.8M | added +268.5% | 2020 Q2 |
| Bank OF America CORP /DE/ | 565.6k | 0.49% | $13.0M | added +48.5% | 2016 Q4 |
| Bridgewater Associates | 551.3k | 0.48% | $12.7M | trimmed -8.8% | 2025 Q3 |
| Jane Street | 550.3k | 0.48% | $12.6M | added +53.9% | 2025 Q3 |
| Voloridge Investment Management | 522.5k | 0.45% | $12.0M | added +163.8% | 2025 Q4 |
| Marnell Management LLC | 430.3k | 0.37% | $9.9M | added +19.1% | 2025 Q4 |
| Vanguard Group | 424.5k | 0.37% | $9.7M | trimmed -3.9% | 2022 Q3 |
| Citadel Advisors | 411.2k | 0.36% | $9.4M | opened | 2020 Q4 |
| Russell Investments Group, LTD. | 379.5k | 0.33% | $8.7M | added +46.7% | 2021 Q3 |
| Valueworks LLC (focused) | 354.9k | 0.31% | $8.1M | trimmed -1% | 2020 Q4 |
| Engineers Gate Manager LP | 313.1k | 0.27% | $7.2M | opened | 2026 Q1 |
| XTX Topco LTD | 306.8k | 0.27% | $7.0M | added +135.4% | 2025 Q4 |
| Walleye Capital LLC | 287.3k | 0.25% | $6.6M | added +608% | 2021 Q1 |
| Susquehanna International Group | 284.6k | 0.25% | $6.5M | trimmed -41.8% | 2016 Q4 |
| LPL Financial LLC | 272.8k | 0.24% | $6.3M | added +77% | 2021 Q1 |
| GSA Capital Partners LLP | 269.8k | 0.23% | $6.2M | opened | 2026 Q1 |
| UBS | 224.1k | 0.19% | $5.1M | trimmed -77.1% | ≤2013 |
| Jump Financial | 219.5k | 0.19% | $5.0M | trimmed -53.9% | 2025 Q4 |
| Counterpoint Mutual Funds LLC | 208.4k | 0.18% | $4.8M | opened | 2026 Q1 |
| Campbell & CO Investment Adviser LLC | 183.5k | 0.16% | $4.2M | opened | 2026 Q1 |
| Schonfeld Strategic Advisors | 156.0k | 0.14% | $3.6M | added +12.8% | 2025 Q1 |
| Geode Capital | 154.1k | 0.13% | $3.5M | added +2.6% | 2014 Q3 |
| Hartree Partners, LP | 150.0k | 0.13% | $3.4M | opened | 2026 Q1 |
| Y-Intercept (Hong Kong) LTD | 144.9k | 0.13% | $3.3M | opened | 2026 Q1 |
| Numerai GP LLC | 143.1k | 0.12% | $3.3M | opened | 2026 Q1 |
| ExodusPoint | 140.2k | 0.12% | $3.2M | trimmed -11.5% | 2025 Q1 |
| KLP Kapitalforvaltning AS | 140.0k | 0.12% | $3.2M | trimmed -6.7% | 2025 Q4 |
| Manatuck Hill Partners, LLC | 133.8k | 0.12% | $3.1M | trimmed -34.3% | 2022 Q4 |
| Marex Group plc | 126.0k | 0.11% | $2.9M | added +142.6% | 2024 Q2 |
| Impala Asset Management LLC (focused) | 120.0k | 0.10% | $2.8M | trimmed -28.1% | 2025 Q4 |
Largest 50 of 183 shown; the full ranked, searchable register is at boothcheck.com/holders/SBLK. 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.