| 1 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 2 | Devon Energy Williston, L.L.C | Oklahoma City, OK 73102-8260 | Oil & Gas Operator | Sep 2025 |
| 3 | Intoil, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2002 |
| 4 | Mann Oil Company, LLC | | Oil Operator | Jun 2023 |
| 5 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 6 | Oasis Petroleum North America LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 7 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 8 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Aug 2025 |
| 9 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 10 | Spotted Hawk Development, LLC | | Oil & Gas Operator | Oct 2025 |
| 11 | Wesco Operating Inc | Casper, WY 82602 | Oil & Gas Operator | Oct 2025 |
| 12 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 13 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 14 | WPX Energy Williston, LLC | | Oil & Gas Operator | Oct 2025 |