7 institutions reported holding $394,660 of ETF OPPORTUNITIES TRUST (RBLU) in SEC 13F filings for 2026-03-31. Largest institutional holders: Optiver Holding B.V. ($255,173), CITADEL ADVISORS LLC ($136,459), SBI Securities Co., Ltd. ($1,656), SIMPLEX TRADING, LLC ($1,029), Tower Research Capital LLC (TRC) ($343). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Optiver Holding B.V. | $255,173 | 21,570 | Added |
| 2 | CITADEL ADVISORS LLC | $136,459 | 11,535 | New |
| 3 | SBI Securities Co., Ltd. | $1,656 | 140 | Added |
| 4 | SIMPLEX TRADING, LLC | $1,029 | 87 | New |
| 5 | Tower Research Capital LLC (TRC) | $343 | 29 | New |
| 6 | CITIGROUP INC | $0 | 0 | Exited |
| 7 | GROUP ONE TRADING LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31