3 institutions reported holding $4.7M of BLACK HILLS CORP (BKHU) in SEC 13F filings for 2026-06-30. Largest institutional holders: SIMPLEX TRADING, LLC ($2.4M), IMC-Chicago, LLC ($2.3M), GROUP ONE TRADING LLC ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SIMPLEX TRADING, LLC | $2.4M | 32,300 | Trimmed |
| 2 | IMC-Chicago, LLC | $2.3M | 31,200 | Trimmed |
| 3 | GROUP ONE TRADING LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30