All 7 companies
A–Z by legal name| Company | Registry number | Registered | Status | City |
|---|---|---|---|---|
| Black Hills Institute Holotype Collection, LLC | DL261912 | 2023-11-03 | Active | Hill City |
| BLACK HILLS INSTITUTE OF GEOLOGICAL RESEARCH INCORPORATED | DB015126 | 1978-03-15 | Active | HILL CITY |
| Black Hills Museum of Natural Science, LLC | DL261910 | 2023-11-03 | Active | HILL CITY |
| Madison Karst Study Project | NS283511 | 2024-09-21 | Dissolved | — |
| New Land Finds LLC | DL316840 | 2025-12-31 | Active | Rapid City |
| Nova Supply LLC | DL276601 | 2024-06-07 | Dissolved | Rapid City |
| The Cave Discovery Initiative | NS203540 | 2021-05-24 | Dissolved | Rapid City |