7 institutions reported holding $5.0M of INVESTMENT MANAGERS SER TR I (TARK) in SEC 13F filings for 2026-06-30. Largest institutional holders: Optiver Holding B.V. ($3.7M), CITADEL ADVISORS LLC ($529,977), SUSQUEHANNA INTERNATIONAL GROUP, LLP ($396,378), HRT FINANCIAL LP ($340,000), SIMPLEX TRADING, LLC ($8,205). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Optiver Holding B.V. | $3.7M | 77,002 | Added |
| 2 | CITADEL ADVISORS LLC | $529,977 | 11,044 | New |
| 3 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $396,378 | 8,260 | New |
| 4 | HRT FINANCIAL LP | $340,000 | 7,103 | New |
| 5 | SIMPLEX TRADING, LLC | $8,205 | 171 | Trimmed |
| 6 | UBS Group AG | $6,094 | 127 | New |
| 7 | Qube Research & Technologies Ltd | $3,167 | 66 | New |
Source: SEC Form 13F filings · as of 2026-06-30