| 1 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Dec 2025 |
| 2 | Ansbro Petroleum Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2008 |
| 3 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 4 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 5 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Oct 2025 |
| 6 | Branch Oil & Gas | Shelby, MT 59474-0766 | Oil & Gas Operator | Jul 2010 |
| 7 | Branch, Jerry L. | | Oil & Gas Operator | Jul 1999 |
| 8 | Cavalier Petroleum | Shelby, MT 59474 | Oil & Gas Operator | Oct 2014 |
| 9 | Chelin LLC | Cut Bank, MT 59427 | Oil & Gas Operator | Aug 2025 |
| 10 | Comanche Drilling Company | Cut Bank, MT 59427 | Oil & Gas Operator | Jun 2025 |
| 11 | Croft Petroleum Co. | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2022 |
| 12 | Cut Bank Gas Company | Cut Bank, MT 59427 | Gas Operator | May 2025 |
| 13 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 14 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 15 | Fulton Producing Co. | Shelby, MT 59474-0603 | Oil & Gas Operator | Feb 2005 |
| 16 | FX Drilling Company, Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Sep 2025 |
| 17 | Glacier Minerals, LLC | The Woodlands, TX 77382 | Gas Operator | Aug 2025 |
| 18 | Glacier Production, Inc. | Cut Bank, MT 59427 | Oil Operator | Sep 2025 |
| 19 | Grey Wolf Production Company, Inc. | Garnett, KS 66032-0426 | Oil Operator | Mar 2015 |
| 20 | Griffon Petroleum, Inc. | Calgary, AB T2P 3K2 | Oil & Gas Operator | May 2007 |
| 21 | Gypsy Highview Gathering System, Inc. | Cut Bank, MT 59427-0250 | Oil & Gas Operator | Oct 2000 |
| 22 | Hardrock Oil Company | Great Falls, MT 59403 | Gas Operator | Aug 2025 |
| 23 | Haynes, Keisel | Bushnell, IL 61422-000 | Gas Operator | Dec 2014 |
| 24 | Home-Stake Oil & Gas Company | Plano, TX 75093 | Oil & Gas Operator | Sep 2025 |
| 25 | Humble Oil & Refining Co. | Houston, TX 77252 | Oil & Gas Operator | Jan 2000 |
| 26 | J & G Operating | Shelby, MT 59474 | Oil & Gas Operator | Aug 2000 |
| 27 | K2 America Corporation | Calgary, AB T3P 3S8 | Oil & Gas Operator | Nov 2017 |
| 28 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 29 | Keesun Corporation | Cut Bank, MT 59427 | Oil & Gas Operator | Sep 2025 |
| 30 | Kipling Energy Incorporated | Shelby, MT 59474 | Oil & Gas Operator | Jan 2011 |
| 31 | Lamarsa Corp. | Cut Bank, MT 59427 | Oil & Gas Operator | Aug 2025 |
| 32 | Lyon, John J. | Bozeman, MT 59718 | Oil & Gas Operator | Jun 2022 |
| 33 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 34 | MCR, LLC | Shelby, MT 59474 | Oil & Gas Operator | Jul 2025 |
| 35 | Mercury Exploration Co. | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 36 | Mogo Reagan, LLC | Cut Bank, MT 59427 | Oil & Gas Operator | Sep 2025 |
| 37 | Montalban Oil & Gas Operations, Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Sep 2025 |
| 38 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |
| 39 | Montana Power Gas Company | | Oil & Gas Operator | Apr 2002 |
| 40 | Monte Grande Exploration, Inc. | Cut Bank, MT 59427 | Oil Operator | Oct 2000 |
| 41 | Mountain States Resources Inc | Cut Bank, MT 59427 | Oil & Gas Operator | Oct 2000 |
| 42 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 43 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 44 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 45 | Newfield Production Company | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jul 2022 |
| 46 | Northwestern Corporation | Butte, MT 59701 | Oil & Gas Operator | Sep 2025 |
| 47 | Northwestern Energy, LLC | Butte, MT 59701 | Oil & Gas Operator | Dec 2004 |
| 48 | NRC Development, LLC | | Gas Operator | Nov 2002 |
| 49 | Omimex Canada, LTD. | Fort Worth, TX 76120-3608 | Oil & Gas Operator | Sep 2025 |
| 50 | Phoenix Production Company | Cody, WY 82414-3607 | Oil & Gas Operator | Oct 2023 |
| 51 | Provident Energy Of Montana, LLC | Cut Bank, MT 59427 | Oil Operator | Aug 2025 |
| 52 | Quest Petroleum Corporation | Reno, NV 89570 | Oil Operator | Apr 1998 |
| 53 | Quicksilver Resources Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2018 |
| 54 | Ranck Oil Company | Cut Bank, MT 59427 | Oil & Gas Operator | Sep 2025 |
| 55 | Rock Creek Oil, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Nov 2019 |
| 56 | Roland Oil And Gas | Cut Bank, MT 59427 | Oil Operator | Feb 2023 |
| 57 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2025 |
| 58 | Somont Oil Co., Inc. | Spring, TX 77379 | Oil & Gas Operator | Sep 2025 |
| 59 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 60 | Summit Resources, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2016 |
| 61 | Synergy Offshore LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2022 |
| 62 | Trout Kye Jr | | Oil & Gas Operator | Dec 2010 |
| 63 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Oct 2025 |
| 64 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 65 | United States Energy Corp. | Longview, TX 75601 | Oil & Gas Operator | Mar 2025 |
| 66 | Yellowstone Petroleums Inc. | Canada, 00100 | Oil & Gas Operator | Jun 2025 |