3 institutions reported holding $2.4M of REX ETF TR (COII) in SEC 13F filings for 2026-06-30. Largest institutional holders: GROUP ONE TRADING LLC ($2.3M), SIMPLEX TRADING, LLC ($115,744), OLD MISSION CAPITAL LLC ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GROUP ONE TRADING LLC | $2.3M | 100,600 | Added |
| 2 | SIMPLEX TRADING, LLC | $115,744 | 6,000 | Added |
| 3 | OLD MISSION CAPITAL LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30