| 1 | Aikins Drilling Company | Mohave Valley, AZ 86440 | Oil Operator | Dec 2019 |
| 2 | Balko, Inc. | Conrad, MT 59425 | Oil & Gas Operator | Jun 2025 |
| 3 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Aug 2025 |
| 4 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2025 |
| 5 | Croft Petroleum Co. | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2022 |
| 6 | Equitable Resources Energy Co, Western Region | Billings, MT 59102 | Oil & Gas Operator | May 1997 |
| 7 | Fairways Exploration & Production, LLC | Houston, TX 77057 | Oil & Gas Operator | Aug 2025 |
| 8 | Fulton Fuel Company | Shelby, MT 59474 | Oil & Gas Operator | May 2025 |
| 9 | Fulton Producing Co. | Shelby, MT 59474-0603 | Oil & Gas Operator | Feb 2005 |
| 10 | Gallup City Oil, Inc. | Conrad, MT 59425 | Oil & Gas Operator | Mar 2011 |
| 11 | Gallup City Oil, LLC | Conrad, MT 59425 | Oil Operator | Jun 2025 |
| 12 | Garman Stripper Wells, LLC | Choteau, MT 59422 | Oil Operator | Jul 2025 |
| 13 | Great Northern Drilling Company | Billings, MT 59103 | Oil & Gas Operator | Jun 2016 |
| 14 | Hawkins, Robert S. | Kevin, MT 59454 | Oil Operator | Jun 2018 |
| 15 | Hawley & Desimon | Conrad, MT 59425 | Oil Operator | Jul 2025 |
| 16 | Hawley Oil Company | Great Falls, MT 59405-5156 | Oil Operator | May 2025 |
| 17 | King-Sherwood Oil | Condon, MT 59826 | Oil Operator | Jun 2025 |
| 18 | Lowrance, Darrell A. | Cut Bank, MT 59427 | Oil Operator | Aug 2007 |
| 19 | MCR, LLC | Shelby, MT 59474 | Oil & Gas Operator | Jun 2025 |
| 20 | Montana Oil Field Acquisition I, LLC | Rutherford, NJ 07070 | Oil Operator | Jun 2016 |
| 21 | Monte Grande Exploration, Inc. | Cut Bank, MT 59427 | Oil Operator | Oct 2000 |
| 22 | Mountain States Resources Inc | Cut Bank, MT 59427 | Oil & Gas Operator | Oct 2000 |
| 23 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 24 | Pondera Partners Limited Partnership | Oroville, WA 98844 | Oil Operator | Sep 2023 |
| 25 | Quicksilver Resources Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2018 |
| 26 | R.C.S. Oil, Inc. | Valier, MT 59486 | Oil Operator | Jul 2025 |
| 27 | Robert Hawkins Inc | Kevin, MT 59454 | Oil & Gas Operator | Jul 2025 |
| 28 | Sands Oil Company Inc | Billings, MT 59103 | Oil & Gas Operator | Jul 2025 |
| 29 | Synergy Offshore LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2022 |