3 institutions reported holding $3.1M of INVESTMENT MANAGERS SER TR I (STXX) in SEC 13F filings for 2026-06-30. Largest institutional holders: CITADEL ADVISORS LLC ($2.4M), SUSQUEHANNA INTERNATIONAL GROUP, LLP ($677,830), SIMPLEX TRADING, LLC ($21,144). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | CITADEL ADVISORS LLC | $2.4M | 40,548 | New |
| 2 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $677,830 | 11,284 | New |
| 3 | SIMPLEX TRADING, LLC | $21,144 | 352 | New |
Source: SEC Form 13F filings · as of 2026-06-30