| 1 | Alta VIsta Oil Corporation | Clearmont, WY 82835 | Oil & Gas Operator | Jul 2021 |
| 2 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Nov 2025 |
| 3 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 4 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Nov 2025 |
| 5 | Bluebird Energy, LLC | Billings, MT 59102 | Oil Operator | Nov 2025 |
| 6 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 7 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 8 | Cirque Resources LP | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 9 | Cline Production Company | Billings, MT 59104 | Oil & Gas Operator | Oct 2025 |
| 10 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 11 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Nov 2025 |
| 12 | Florentine Exploration & Production, Inc. | | Oil Operator | Mar 1997 |
| 13 | Grand Resources, LTD. | Rockville, MD 20852 | Oil Operator | Jul 2025 |
| 14 | Great Plains Operating, LLC. | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2014 |
| 15 | Great Plains Resources, Inc. | Nixon, TX 78140 | Oil & Gas Operator | Dec 2025 |
| 16 | Hammond Valley Colony, Inc. | Harlowton, MT 59036 | Gas Operator | Nov 2025 |
| 17 | Journey Operating LLC | Sugar Land, TX 77496 | Oil & Gas Operator | Aug 2006 |
| 18 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 19 | Montana Energy Company, LLC | McAllen, TX 78504 | Oil & Gas Operator | Jul 2025 |
| 20 | Phoenix Production Company | Cody, WY 82414-3607 | Oil & Gas Operator | Oct 2023 |
| 21 | Pinnacle Gas Resources, Inc. | Sheridan, WY 82801 | Gas Operator | Mar 2011 |
| 22 | R3 Operating Corporation | Denver, CO 80222 | Oil & Gas Operator | Dec 2025 |
| 23 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 24 | Sdoco, LLC | Highlands Ranch, CO 80129 | Oil Operator | Oct 2025 |
| 25 | Summit Gas Resources Inc | Sheridan, WY 82801 | Gas Operator | Dec 2023 |
| 26 | Sun Coulee, LLC | Martinsdale, MT 59053 | Oil & Gas Operator | Nov 2025 |
| 27 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 28 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Sep 2025 |
| 29 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 30 | Three Forks Resources, LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Dec 2025 |
| 31 | Tomahawk Oil Company, Inc. | Roundup, MT 59072 | Oil Operator | Nov 2025 |
| 32 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Nov 2025 |
| 33 | Tyler Oil Company | Billings, MT 59104-3203 | Oil & Gas Operator | Nov 2019 |
| 34 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Oct 2025 |
| 35 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 36 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |