10 institutions reported holding $398,324 of THEMES ETF TR (DUOG) in SEC 13F filings for 2026-06-30. Largest institutional holders: CITADEL ADVISORS LLC ($259,018), Optiver Holding B.V. ($119,904), SIMPLEX TRADING, LLC ($19,015), GROUP ONE TRADING LLC ($387), SUSQUEHANNA INTERNATIONAL GROUP, LLP ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | CITADEL ADVISORS LLC | $259,018 | 6,688 | Trimmed |
| 2 | Optiver Holding B.V. | $119,904 | 3,096 | Trimmed |
| 3 | SIMPLEX TRADING, LLC | $19,015 | 491 | Added |
| 4 | GROUP ONE TRADING LLC | $387 | 10 | New |
| 5 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $0 | 0 | Exited |
| 6 | GTS SECURITIES LLC | $0 | 0 | Exited |
| 7 | Tower Research Capital LLC (TRC) | $0 | 0 | Exited |
| 8 | JANE STREET GROUP, LLC | $0 | 0 | Exited |
| 9 | Garden State Investment Advisory Services LLC | $0 | 0 | Exited |
| 10 | Virtu Financial LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30