23 institutions reported holding $26.6M of ETF OPPORTUNITIES TRUST (MSTZ) in SEC 13F filings for 2026-03-31. Largest institutional holders: SUSQUEHANNA INTERNATIONAL GROUP, LLP ($13.7M), JANE STREET GROUP, LLC ($4.7M), CITADEL ADVISORS LLC ($2.4M), XTX Topco Ltd ($1.5M), Elequin Capital, LP ($936,624). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $13.7M | 1.1M | Added |
| 2 | JANE STREET GROUP, LLC | $4.7M | 373,633 | Trimmed |
| 3 | CITADEL ADVISORS LLC | $2.4M | 189,200 | Added |
| 4 | XTX Topco Ltd | $1.5M | 117,319 | New |
| 5 | Elequin Capital, LP | $936,624 | 41,107 | Added |
| 6 | StoneX Group Inc. | $726,224 | 58,191 | Added |
| 7 | FLOW TRADERS U.S. LLC | $586,000 | 46,921 | New |
| 8 | TWO SIGMA SECURITIES, LLC | $530,637 | 42,519 | New |
| 9 | GTS SECURITIES LLC | $403,566 | 32,337 | New |
| 10 | IMC-Chicago, LLC | $319,812 | 25,626 | Added |
| 11 | Jump Financial, LLC | $298,309 | 23,903 | Trimmed |
| 12 | Optiver Holding B.V. | $209,115 | 16,756 | Trimmed |
| 13 | SBI Securities Co., Ltd. | $170,327 | 13,648 | Trimmed |
| 14 | Belvedere Trading LLC | $135,271 | 10,839 | New |
| 15 | SIMPLEX TRADING, LLC | $37,577 | 3,011 | New |
| 16 | Federation des caisses Desjardins du Quebec | $21,216 | 1,700 | New |
| 17 | IFP Advisors, Inc | $150 | 12 | New |
| 18 | Tower Research Capital LLC (TRC) | $0 | 0 | Exited |
| 19 | UBS Group AG | $0 | 0 | Exited |
| 20 | HOLLENCREST CAPITAL MANAGEMENT | $0 | 0 | Exited |
| 21 | Headlands Technologies LLC | $0 | 0 | Exited |
| 22 | Scientech Research LLC | $0 | 0 | Exited |
| 23 | CITIGROUP INC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31