| Symbol | Name | Country | Exchange |
|---|---|---|---|
| BKH | Black Hills Corporation | US | NYSE |
| KRP | Kimbell Royalty Partners | US | NYSE |
| MTR | Mesa Royalty Trust | US | NYSE |
| SJT | San Juan Basin Royalty Trust | US | NYSE |
| WMB | Williams Companies, Inc. (The) | US | NYSE |
| HRST | Harvest Oil & Gas Corp | US | OTC |