4 institutions reported holding $161.5M of PROSHARES SHORT VIX ST FUTUR (OILU1) in SEC 13F filings for 2026-06-30. Largest institutional holders: IMC-Chicago, LLC ($90.6M), GROUP ONE TRADING LLC ($45.2M), SIMPLEX TRADING, LLC ($25.6M), RAMSEY QUANTITATIVE SYSTEMS ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $90.6M | 1.5M | Trimmed |
| 2 | GROUP ONE TRADING LLC | $45.2M | 987,100 | Trimmed |
| 3 | SIMPLEX TRADING, LLC | $25.6M | 443,900 | Added |
| 4 | RAMSEY QUANTITATIVE SYSTEMS | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30