3 institutions reported holding $916,596 of OSISKO DEVELOPMENT CORP (RNGTF) in SEC 13F filings for 2026-06-30. Largest institutional holders: GROUP ONE TRADING LLC ($442,554), IMC-Chicago, LLC ($251,904), SIMPLEX TRADING, LLC ($222,138). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GROUP ONE TRADING LLC | $442,554 | 179,900 | Added |
| 2 | IMC-Chicago, LLC | $251,904 | 102,400 | Trimmed |
| 3 | SIMPLEX TRADING, LLC | $222,138 | 90,300 | Added |
Source: SEC Form 13F filings · as of 2026-06-30