Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
92 institutional managers reported holding ECO for the quarter ended Mar 31, 2026. Together they hold about 28% of shares outstanding; the top 10 hold 16%. 40 opened new positions; 12 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| QVT Financial LP | 1.42M | 4.37% | $72.0M | unchanged | 2024 Q1 |
| FIL LTD | 624.2k | 1.92% | $31.6M | added +8.7% | 2023 Q4 |
| Portolan Capital Management, LLC | 538.9k | 1.65% | $27.3M | added +233% | 2025 Q4 |
| Marshall Wace | 492.0k | 1.51% | $24.9M | added +52.6% | 2025 Q4 |
| Encompass Capital Advisors LLC | 377.4k | 1.16% | $19.1M | trimmed -53.4% | 2025 Q4 |
| Acadian Asset Management | 367.3k | 1.13% | $18.6M | opened | 2026 Q1 |
| VR Advisory Services LTD (focused) | 343.7k | 1.05% | $17.4M | added +33.6% | 2024 Q3 |
| Goldman Sachs | 342.4k | 1.05% | $17.3M | added +51.9% | 2023 Q4 |
| Jane Street | 326.3k | 1.00% | $16.5M | added +310.9% | 2025 Q4 |
| Two Sigma | 304.4k | 0.93% | $15.4M | added +92.2% | 2025 Q2 |
| Bank OF America CORP /DE/ | 278.3k | 0.85% | $14.1M | added +96.7% | 2023 Q4 |
| Barclays PLC | 270.0k | 0.83% | $13.7M | added +142.9% | 2023 Q4 |
| BlackRock | 266.6k | 0.82% | $13.5M | added +29.8% | 2025 Q3 |
| Fearnley Asset Management AS (focused) | 236.4k | 0.73% | $12.0M | added +370.9% | 2025 Q4 |
| Voloridge Investment Management | 178.1k | 0.55% | $9.0M | opened | 2026 Q1 |
| Walleye Capital LLC | 177.4k | 0.55% | $9.0M | added +71.9% | 2025 Q4 |
| Qube Research & Technologies LTD | 172.8k | 0.53% | $8.7M | added +133% | 2025 Q4 |
| Arrowstreet Capital | 158.6k | 0.49% | $8.0M | trimmed -45.8% | 2023 Q4 |
| Point72 | 131.1k | 0.40% | $6.6M | added +10.6% | 2025 Q3 |
| Oceanic Investment Management LTD (focused) | 112.4k | 0.34% | $5.7M | opened | 2026 Q1 |
| Global IMC LLC (focused) | 107.0k | 0.33% | $5.4M | opened | 2026 Q1 |
| Dymon Asia Capital (SINGAPORE) Pte. LTD. | 105.0k | 0.32% | $5.3M | opened | 2026 Q1 |
| BNP Paribas Financial Markets | 99.0k | 0.30% | $5.0M | added +225.6% | 2025 Q2 |
| Millennium Management | 91.2k | 0.28% | $4.6M | trimmed -26.5% | 2024 Q3 |
| UBS | 90.9k | 0.28% | $4.6M | added +44.2% | 2023 Q4 |
| Raymond James Financial INC | 83.1k | 0.26% | $4.2M | opened | 2026 Q1 |
| Informed Momentum CO LLC | 80.6k | 0.25% | $4.1M | opened | 2026 Q1 |
| Engineers Gate Manager LP | 71.5k | 0.22% | $3.6M | added +37.7% | 2025 Q4 |
| Militia Capital Management LLC | 70.0k | 0.21% | $3.5M | opened | 2026 Q1 |
| Quadrature Capital LTD | 69.2k | 0.21% | $3.5M | added +18.1% | 2025 Q4 |
| Energy Income Partners, LLC | 69.1k | 0.21% | $3.5M | added +3.4% | 2024 Q3 |
| Invesco | 63.2k | 0.19% | $3.2M | added +222% | 2025 Q2 |
| Boothbay Fund Management, LLC | 63.1k | 0.19% | $3.2M | added +145.3% | 2024 Q4 |
| ExodusPoint | 62.0k | 0.19% | $3.1M | added +328.6% | 2025 Q4 |
| Morgan Stanley | 58.9k | 0.18% | $3.0M | added +21.3% | 2024 Q1 |
| Penserra Capital Management LLC | 58.6k | 0.18% | $3.0M | opened | 2026 Q1 |
| Thomist Capital Management, LP (focused) | 55.1k | 0.17% | $2.8M | opened | 2026 Q1 |
| HRT Financial LP | 54.7k | 0.17% | $2.8M | opened | 2026 Q1 |
| Aquatic Capital Management LLC | 53.6k | 0.17% | $2.7M | added +323.8% | 2025 Q4 |
| Marnell Management LLC | 53.3k | 0.16% | $2.7M | added +561% | 2025 Q4 |
| Graham Capital Wealth Management, LLC | 52.6k | 0.16% | $2.7M | opened | 2026 Q1 |
| Cetera Investment Advisers | 42.4k | 0.13% | $2.1M | opened | 2026 Q1 |
| GeoSphere Capital Management, LLC (focused) | 40.0k | 0.12% | $2.0M | trimmed -44.8% | 2025 Q4 |
| XTX Topco LTD | 38.4k | 0.12% | $1.9M | opened | 2026 Q1 |
| Cvfg LLC | 31.7k | 0.10% | $1.6M | opened | 2026 Q1 |
| Credit Agricole S A | 30.0k | 0.09% | $1.5M | unchanged | 2025 Q4 |
| Glenorchy Capital LTD | 27.7k | 0.09% | $1.4M | added +11.5% | 2023 Q4 |
| Citigroup INC | 27.3k | 0.08% | $1.4M | added +37.8% | 2023 Q4 |
| Massar Capital Management, LP | 26.3k | 0.08% | $1.3M | opened | 2026 Q1 |
| Uniplan Investment Counsel, INC. | 22.8k | 0.07% | $1.2M | opened | 2026 Q1 |
Largest 50 of 92 shown; the full ranked, searchable register is at boothcheck.com/holders/ECO. 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.