| 1 | Altamont Oil & Gas Inc. | Cut Bank, MT 59427-0200 | Oil & Gas Operator | May 2012 |
| 2 | Austin, Chas W | | Oil Operator | Jan 2009 |
| 3 | Ayers, Milan R. | | Gas Operator | Oct 2000 |
| 4 | Balko, Inc. | Conrad, MT 59425 | Oil & Gas Operator | Dec 2025 |
| 5 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Dec 2025 |
| 6 | Branch Oil & Gas | Shelby, MT 59474-0766 | Oil & Gas Operator | Jul 2010 |
| 7 | Branch, Jerry L. | | Oil & Gas Operator | Jul 1999 |
| 8 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2025 |
| 9 | Campanella, George L | Great Falls, MT 59403 | Oil & Gas Operator | Nov 2025 |
| 10 | Compass Energy, Inc. | Shelby, MT 59474 | Gas Operator | Feb 2007 |
| 11 | Equitable Resources Energy Co, Western Region | Billings, MT 59102 | Oil & Gas Operator | May 1997 |
| 12 | Fulton Fuel Company | Shelby, MT 59474 | Oil & Gas Operator | Oct 2025 |
| 13 | Fulton Producing Co. | Shelby, MT 59474-0603 | Oil & Gas Operator | Feb 2005 |
| 14 | FX Drilling Company, Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2025 |
| 15 | Gallup City Oil, Inc. | Conrad, MT 59425 | Oil & Gas Operator | Mar 2011 |
| 16 | Gallup City Oil, LLC | Conrad, MT 59425 | Oil Operator | Nov 2025 |
| 17 | Hawkins, Robert S. | Kevin, MT 59454 | Oil Operator | Jun 2018 |
| 18 | Hawley & Desimon | Conrad, MT 59425 | Oil Operator | Nov 2025 |
| 19 | Hawley Hydrocarbons, Merrill&Carol Hawley Dba | Great Falls, MT 59405 | Oil Operator | Dec 2025 |
| 20 | Hawley Oil Company | Great Falls, MT 59405-5156 | Oil Operator | Nov 2025 |
| 21 | K2 America Corporation | Calgary, AB T3P 3S8 | Oil & Gas Operator | Nov 2017 |
| 22 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 23 | Keesun Corporation | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2025 |
| 24 | Lamarsa Corp. | Cut Bank, MT 59427 | Oil & Gas Operator | Nov 2025 |
| 25 | McMinn Operating Company, Inc. | Hempstead, TX 77445 | Oil & Gas Operator | Feb 2026 |
| 26 | MCR, LLC | Shelby, MT 59474 | Oil & Gas Operator | Oct 2025 |
| 27 | Montalban Oil & Gas Operations, Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2025 |
| 28 | Montana Oil Field Acquisition I, LLC | Rutherford, NJ 07070 | Oil Operator | Jun 2016 |
| 29 | Mountain Pacific General Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Jun 2022 |
| 30 | Mountain States Resources Inc | Cut Bank, MT 59427 | Oil & Gas Operator | Oct 2000 |
| 31 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 32 | NRC Development, LLC | | Gas Operator | Nov 2002 |
| 33 | Petrox Petroleum Company | Great Falls, MT 59403-0989 | Oil Operator | Dec 2025 |
| 34 | Provident Energy Of Montana, LLC | Cut Bank, MT 59427 | Oil Operator | Dec 2025 |
| 35 | Quicksilver Resources Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2018 |
| 36 | R.C.S. Oil, Inc. | Conrad, MT 59425 | Oil Operator | Oct 2025 |
| 37 | Ranck Oil Company | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2025 |
| 38 | Robert Hawkins Inc | Kevin, MT 59454 | Oil & Gas Operator | Dec 2025 |
| 39 | Roland Oil And Gas | Cut Bank, MT 59427 | Oil Operator | Feb 2023 |
| 40 | Sands Oil Company Inc | Billings, MT 59103 | Oil & Gas Operator | Dec 2025 |
| 41 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Dec 2025 |
| 42 | Somont Oil Co., Inc. | Spring, TX 77379 | Oil & Gas Operator | Dec 2025 |
| 43 | Synergy Offshore LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2022 |
| 44 | T.W.O. (Taylor Well Operating) | Missoula, MT 59803 | Oil & Gas Operator | Dec 2025 |
| 45 | TNT Oil, LLC | Conrad, MT 59425 | Oil Operator | Nov 2017 |
| 46 | Yellowstone Petroleums Inc. | Canada, 00100 | Oil & Gas Operator | Jun 2025 |