23 institutions reported holding $35.1M of ETF OPPORTUNITIES TRUST (MSTZ) in SEC 13F filings for 2026-06-30. Largest institutional holders: SUSQUEHANNA INTERNATIONAL GROUP, LLP ($16.8M), JANE STREET GROUP, LLC ($6.4M), CITADEL ADVISORS LLC ($3.4M), HRT FINANCIAL LP ($3.0M), StoneX Group Inc. ($1.8M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $16.8M | 1.1M | Trimmed |
| 2 | JANE STREET GROUP, LLC | $6.4M | 412,835 | Added |
| 3 | CITADEL ADVISORS LLC | $3.4M | 216,300 | Added |
| 4 | HRT FINANCIAL LP | $3.0M | 190,006 | New |
| 5 | StoneX Group Inc. | $1.8M | 169,824 | Added |
| 6 | IMC-Chicago, LLC | $890,133 | 57,317 | Added |
| 7 | GROUP ONE TRADING LLC | $814,176 | 52,426 | New |
| 8 | XTX Topco Ltd | $554,654 | 35,715 | Trimmed |
| 9 | TWO SIGMA SECURITIES, LLC | $537,913 | 34,637 | Trimmed |
| 10 | Optiver Holding B.V. | $400,969 | 25,819 | Added |
| 11 | GTS SECURITIES LLC | $176,250 | 11,349 | Trimmed |
| 12 | UBS Group AG | $136,183 | 8,769 | New |
| 13 | CITIGROUP INC | $131,617 | 8,475 | New |
| 14 | Geneos Wealth Management Inc. | $78,085 | 5,028 | New |
| 15 | Royal Bank of Canada | $71,000 | 4,573 | New |
| 16 | SBI Securities Co., Ltd. | $18,061 | 1,163 | Trimmed |
| 17 | Elequin Capital, LP | $5,715 | 368 | Trimmed |
| 18 | FLOW TRADERS U.S. LLC | $0 | 0 | Exited |
| 19 | SIMPLEX TRADING, LLC | $0 | 0 | Exited |
| 20 | Belvedere Trading LLC | $0 | 0 | Exited |
| 21 | IFP Advisors, Inc | $0 | 0 | Exited |
| 22 | Jump Financial, LLC | $0 | 0 | Exited |
| 23 | Federation des caisses Desjardins du Quebec | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30