57 institutions reported holding $142.3M of PROSHARES (OILK) in SEC 13F filings for 2026-06-30. Largest institutional holders: Trek Financial, LLC ($35.1M), Harvest Fund Management Co., Ltd ($32.7M), Merit Financial Group, LLC ($21.7M), SUSQUEHANNA INTERNATIONAL GROUP, LLP ($12.4M), CITADEL ADVISORS LLC ($6.9M). Source: SEC Form 13F.
Source: SEC Form 13F filings · as of 2026-06-30