| 1 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 2 | Armstrong Operating, Inc. | Dickinson, ND 58602 | Oil & Gas Operator | Feb 2024 |
| 3 | Artex Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Dec 2023 |
| 4 | Aztec Gas And Oil Corporation | Elephant Butte, NM 87935-0370 | Oil & Gas Operator | Mar 2005 |
| 5 | Basic Earth Science Systems, Inc. | Austin, TX 78714 | Oil & Gas Operator | Apr 2010 |
| 6 | Bensun Energy, LLC | Grandview, TX 76050 | Oil Operator | Aug 2020 |
| 7 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Nov 2022 |
| 8 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 9 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Apr 2024 |
| 10 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Feb 2024 |
| 11 | Chandler Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2009 |
| 12 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2024 |
| 13 | Charger Resources, LLC | Hurst, TX 76054 | Oil & Gas Operator | Aug 2015 |
| 14 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2024 |
| 15 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 16 | City Of Baker | Baker, MT 59313 | Gas Operator | Feb 2024 |
| 17 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2024 |
| 18 | Crown Oil, Inc. | Houston, TX 77002 | Oil Operator | Jan 1999 |
| 19 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Apr 2024 |
| 20 | Diamond Oil & Gas LLC | Casper, WY 82604 | Oil & Gas Operator | Feb 2024 |
| 21 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Jan 2024 |
| 22 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2024 |
| 23 | Jurassic Resources Development Na LLC | Bismarck, ND 58504-5835 | Gas Operator | Jan 2024 |
| 24 | Macum Energy Inc | Billings, MT 59104 | Oil & Gas Operator | Aug 2021 |
| 25 | Newfield Production Company | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jul 2022 |
| 26 | Prospective Investment & Trading Co., LTD., The | Tulsa, OK 74170-2320 | Oil & Gas Operator | Apr 2014 |
| 27 | Remuda Energy Development LLC | Billings, MT 59104 | Oil & Gas Operator | Feb 2024 |
| 28 | Reserve Operating Corp. | Houston, TX 77040 | Oil & Gas Operator | Apr 2024 |
| 29 | Sagebrush Operating LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2023 |
| 30 | Sands Oil Company Inc | Billings, MT 59103 | Oil & Gas Operator | Feb 2024 |
| 31 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 32 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 33 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2023 |
| 34 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 35 | Wbi Energy Transmission, Inc. | Glendive, MT 59330-0131 | Gas Operator | Nov 1999 |
| 36 | Wbi Production, Inc. | Glendive, MT 59330-0131 | Gas Operator | Mar 2001 |
| 37 | Wesco Operating, Inc. | Casper, WY 82602 | Oil & Gas Operator | Feb 2024 |