| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Mar 2025 |
| 2 | Behm Energy, Inc. | Minot, ND 58702 | Oil & Gas Operator | Feb 2025 |
| 3 | Brown, J. Burns Operating Co. | Havre, MT 59501 | Oil & Gas Operator | Jan 2025 |
| 4 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Mar 2025 |
| 5 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Mar 2025 |
| 6 | Croft Petroleum Co. | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2022 |
| 7 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 8 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 9 | Eagle Operating Inc | Minot, ND 58701 | Oil & Gas Operator | Jan 2025 |
| 10 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 11 | Granite Creek Energy LLC | Cody, WY 82414 | Oil & Gas Operator | Jan 2025 |
| 12 | Hardrock Oil Company | Great Falls, MT 59403 | Gas Operator | Dec 2024 |
| 13 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 14 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 15 | Kykuit Resources, LLC | Winifred, MT 59489 | Gas Operator | Mar 2021 |
| 16 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 17 | Lonewolf Operating, LLC | Billings, MT 59108 | Oil & Gas Operator | Nov 2024 |
| 18 | Macum Energy Inc | Billings, MT 59104 | Oil & Gas Operator | Aug 2021 |
| 19 | Montana Land & Exploration, Inc. | Calgary, AB T2P 3E7 | Oil & Gas Operator | Apr 2019 |
| 20 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |
| 21 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 22 | Nexen Oil & Gas USA, Inc. | Calgary, AB T2P 5C1 | Oil & Gas Operator | Feb 2010 |
| 23 | NFR Bear Paw Basin, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2013 |
| 24 | Northwestern Corporation | Butte, MT 59701 | Oil & Gas Operator | Jan 2025 |
| 25 | Ocean Energy Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 26 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 27 | Omimex Canada, LTD. | Fort Worth, TX 76120-3608 | Oil & Gas Operator | Jan 2025 |
| 28 | Ranck Oil Company | Cut Bank, MT 59427 | Oil & Gas Operator | Oct 2024 |
| 29 | Solomon Exploration Inc. | Havre, MT 59501 | Gas Operator | Sep 2024 |
| 30 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 31 | Summit Resources, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2016 |
| 32 | Texaco Exploration And Production Inc | Houston, TX 77236 | Oil & Gas Operator | Nov 2024 |
| 33 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Mar 2025 |
| 34 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Jan 2025 |
| 35 | Vesta Inc | Great Falls, MT 59403 | Gas Operator | Mar 1997 |
| 36 | Xeno, Inc | Calgary, AB T2P 2S5 | Gas Operator | Dec 2001 |