| 1 | A. B. Energy LLC | Chester, MT 59522 | Oil & Gas Operator | Mar 2026 |
| 2 | Athena Energy LLC | Toronto, ON M5E 1W7 | Gas Operator | Jan 2011 |
| 3 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Apr 2026 |
| 4 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Nov 2022 |
| 5 | Branch Oil & Gas | Shelby, MT 59474-0766 | Oil & Gas Operator | Jul 2010 |
| 6 | Branch, Jerry L. | | Oil & Gas Operator | Jul 1999 |
| 7 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2026 |
| 8 | Brown, J. Burns Operating Co. | Havre, MT 59501 | Oil & Gas Operator | Mar 2026 |
| 9 | Cavalier Petroleum | Shelby, MT 59474 | Oil & Gas Operator | Oct 2014 |
| 10 | Chelin LLC | Cut Bank, MT 59427 | Oil & Gas Operator | Mar 2026 |
| 11 | Coolidge, G. B., Inc. | Shelby, MT 59474 | Oil & Gas Operator | Aug 2016 |
| 12 | Croft Petroleum Co. | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2022 |
| 13 | Dart Oil & Gas Corporation | Mason, MI 48854 | Oil & Gas Operator | Jun 2018 |
| 14 | Eagle Creek Colony | Galata, MT 59444 | Oil & Gas Operator | Mar 2026 |
| 15 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 16 | Fulton Fuel Company | Shelby, MT 59474 | Oil & Gas Operator | Jan 2026 |
| 17 | Fulton Producing Co. | Shelby, MT 59474-0603 | Oil & Gas Operator | Feb 2005 |
| 18 | Fulton, William M. | Shelby, MT 59474 | Oil & Gas Operator | Feb 2005 |
| 19 | FX Drilling Company, Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Mar 2026 |
| 20 | G/S Producing, Inc. | Chester, MT 59522 | Oil & Gas Operator | Mar 2026 |
| 21 | Great Northern Drilling Company | Billings, MT 59103 | Oil & Gas Operator | Jun 2016 |
| 22 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 23 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 24 | Lamarsa Corp. | Cut Bank, MT 59427 | Oil & Gas Operator | Mar 2026 |
| 25 | Luff Exploration Company | Denver, CO 80203 | Oil & Gas Operator | Apr 2026 |
| 26 | Lyon, John J. | Bozeman, MT 59718 | Oil & Gas Operator | Jun 2022 |
| 27 | McCarthy, Lawrence J. | Plains, MT 59859-9215 | Oil & Gas Operator | Nov 2011 |
| 28 | MCR, LLC | Shelby, MT 59474 | Oil & Gas Operator | Jan 2026 |
| 29 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |
| 30 | Montana Power Gas Company | | Oil & Gas Operator | Apr 2002 |
| 31 | Omimex Canada, LTD. | Fort Worth, TX 76120-3608 | Oil & Gas Operator | Mar 2026 |
| 32 | Parsell, R. W. | Whitlash, MT 59545 | Oil & Gas Operator | Feb 2026 |
| 33 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 34 | Prairie Dog Exploration, LLC | Calgary, Alberta, T2P 0J9 | Gas Operator | Jun 2009 |
| 35 | Ranck Oil Company | Cut Bank, MT 59427 | Oil & Gas Operator | Mar 2026 |
| 36 | Sage Creek Colony | Chester, MT 59522 | Gas Operator | Mar 2026 |
| 37 | Sands Oil Company Inc | Billings, MT 59103 | Oil & Gas Operator | Mar 2026 |
| 38 | Shadco | Worland, WY 82401 | Oil & Gas Operator | Aug 2025 |
| 39 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2026 |
| 40 | T.W.O. (Taylor Well Operating) | Missoula, MT 59803 | Oil & Gas Operator | Mar 2026 |
| 41 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 42 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 43 | Three Forks Resources, LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Jun 2026 |
| 44 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Sep 2025 |
| 45 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Apr 2026 |
| 46 | Western Natural Gas Company | Shelby, MT 59474 | Oil & Gas Operator | Feb 2026 |
| 47 | Wheless Industries, Inc. | Shreveport, LA 71101-5301 | Oil & Gas Operator | Sep 2002 |
| 48 | Woods, Pete Or Maxine | Chester, MT 59522 | Oil & Gas Operator | Feb 2026 |