| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Nov 2024 |
| 2 | Athena Energy LLC | Toronto, ON M5E 1W7 | Gas Operator | Jan 2011 |
| 3 | Austin, Chas W | | Oil Operator | Jan 2009 |
| 4 | Brainstorm Energy, Inc. | Whitefish, MT 59937 | Oil & Gas Operator | Sep 2024 |
| 5 | Brown, J. Burns Operating Co. | Havre, MT 59501 | Oil & Gas Operator | Aug 2024 |
| 6 | Chippewa Cree Tribe | | Gas Operator | Sep 2024 |
| 7 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2024 |
| 8 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 9 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 10 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Sep 2024 |
| 11 | Fulton Producing Co. | Shelby, MT 59474-0603 | Oil & Gas Operator | Feb 2005 |
| 12 | G/S Producing, Inc. | Chester, MT 59522 | Oil & Gas Operator | Aug 2024 |
| 13 | Griffon Petroleum, Inc. | Calgary, AB T2P 3K2 | Oil & Gas Operator | May 2007 |
| 14 | Grynberg, Jack J. | Denver, CO 80237 | Oil & Gas Operator | Jun 2021 |
| 15 | HR Energy LLC | Shelby, MT 59474 | Oil & Gas Operator | Aug 2024 |
| 16 | Intermountain Operating, Inc. | Billings, MT 59103 | Oil & Gas Operator | Jul 2001 |
| 17 | Kipling Energy Incorporated | Shelby, MT 59474 | Oil & Gas Operator | Jan 2011 |
| 18 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 19 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |
| 20 | Montana Power Gas Company | | Oil & Gas Operator | Apr 2002 |
| 21 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 22 | NFR Bear Paw Basin, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2013 |
| 23 | Northwestern Corporation | Butte, MT 59701 | Oil & Gas Operator | Sep 2024 |
| 24 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 25 | Ocean Energy Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2024 |
| 26 | Omimex Canada, LTD. | Fort Worth, TX 76120-3608 | Oil & Gas Operator | Sep 2024 |
| 27 | Sage Creek Colony | Chester, MT 59522 | Gas Operator | Aug 2024 |
| 28 | Solomon Exploration Inc. | Havre, MT 59501 | Gas Operator | Jul 2024 |
| 29 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 30 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Nov 2024 |
| 31 | Western Natural Gas Company | Shelby, MT 59474 | Oil & Gas Operator | Jul 2024 |