6 institutions reported holding $3.7M of REX ETF TR (WMTI) in SEC 13F filings for 2026-06-30. Largest institutional holders: GROUP ONE TRADING LLC ($2.3M), OLD MISSION CAPITAL LLC ($718,900), CITADEL ADVISORS LLC ($302,845), JANE STREET GROUP, LLC ($228,964), SIMPLEX TRADING, LLC ($115,744). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GROUP ONE TRADING LLC | $2.3M | 100,700 | Added |
| 2 | OLD MISSION CAPITAL LLC | $718,900 | 32,500 | New |
| 3 | CITADEL ADVISORS LLC | $302,845 | 13,691 | New |
| 4 | JANE STREET GROUP, LLC | $228,964 | 10,351 | Trimmed |
| 5 | SIMPLEX TRADING, LLC | $115,744 | 6,000 | Added |
| 6 | UBS Group AG | $95,647 | 4,324 | New |
Source: SEC Form 13F filings · as of 2026-06-30