3 institutions reported holding $5.1M of BLACK HILLS CORP (BKHU) in SEC 13F filings for 2026-03-31. Largest institutional holders: SIMPLEX TRADING, LLC ($2.6M), IMC-Chicago, LLC ($2.2M), GROUP ONE TRADING LLC ($208,230). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SIMPLEX TRADING, LLC | $2.6M | 37,700 | Added |
| 2 | IMC-Chicago, LLC | $2.2M | 32,200 | Added |
| 3 | GROUP ONE TRADING LLC | $208,230 | 3,000 | Added |
Source: SEC Form 13F filings · as of 2026-03-31