5 institutions reported holding $1.4M of THEMES ETF TR (TSMG) in SEC 13F filings for 2026-03-31. Largest institutional holders: CITADEL ADVISORS LLC ($943,465), Optiver Holding B.V. ($399,538), HALBERT HARGROVE GLOBAL ADVISORS, LLC ($15,653), SIMPLEX TRADING, LLC ($5,931), UBS Group AG ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | CITADEL ADVISORS LLC | $943,465 | 34,200 | Added |
| 2 | Optiver Holding B.V. | $399,538 | 14,483 | Added |
| 3 | HALBERT HARGROVE GLOBAL ADVISORS, LLC | $15,653 | 567 | Hold |
| 4 | SIMPLEX TRADING, LLC | $5,931 | 215 | New |
| 5 | UBS Group AG | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31