5 institutions reported holding $7.0M of ROUNDHILL ETF TRUST (COSW) in SEC 13F filings for 2026-06-30. Largest institutional holders: EXCHANGE TRADED CONCEPTS, LLC ($6.6M), GTS SECURITIES LLC ($393,938), SUSQUEHANNA INTERNATIONAL GROUP, LLP ($0), OLD MISSION CAPITAL LLC ($0), SIMPLEX TRADING, LLC ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | EXCHANGE TRADED CONCEPTS, LLC | $6.6M | 164,212 | Trimmed |
| 2 | GTS SECURITIES LLC | $393,938 | 9,788 | Added |
| 3 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $0 | 0 | Exited |
| 4 | OLD MISSION CAPITAL LLC | $0 | 0 | Exited |
| 5 | SIMPLEX TRADING, LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30