9 institutions reported holding $622,179 of ETF OPPORTUNITIES TRUST (AAPX) in SEC 13F filings for 2026-03-31. Largest institutional holders: CITADEL ADVISORS LLC ($357,867), Optiver Holding B.V. ($255,412), CREATIVE FINANCIAL DESIGNS INC /ADV ($5,129), SIMPLEX TRADING, LLC ($3,771), GROUP ONE TRADING LLC ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | CITADEL ADVISORS LLC | $357,867 | 14,045 | Trimmed |
| 2 | Optiver Holding B.V. | $255,412 | 10,024 | Added |
| 3 | CREATIVE FINANCIAL DESIGNS INC /ADV | $5,129 | 201 | Hold |
| 4 | SIMPLEX TRADING, LLC | $3,771 | 148 | Added |
| 5 | GROUP ONE TRADING LLC | $0 | 0 | Exited |
| 6 | GTS SECURITIES LLC | $0 | 0 | Exited |
| 7 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $0 | 0 | Exited |
| 8 | FLOW TRADERS U.S. LLC | $0 | 0 | Exited |
| 9 | UBS Group AG | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31