| 1 | A & G Oil & Gas | Shelby, MT 59474 | Oil & Gas Operator | Jul 2011 |
| 2 | A. B. Energy LLC | Chester, MT 59522 | Oil & Gas Operator | Dec 2025 |
| 3 | Alme, Henry A. | Cut Bank, MT 59427 | Gas Operator | Nov 2025 |
| 4 | American Midwest Oil & Gas Corp. | Billings, MT 59101 | Gas Operator | Jun 2021 |
| 5 | Ayers, Milan R. | | Gas Operator | Oct 2000 |
| 6 | Balko, Inc. | Conrad, MT 59425 | Oil & Gas Operator | Dec 2025 |
| 7 | Ballantyne Ventures LLC | Shelby, MT 59474 | Oil & Gas Operator | Nov 2025 |
| 8 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Dec 2025 |
| 9 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Jan 2026 |
| 10 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 11 | Brainstorm Energy, Inc. | Whitefish, MT 59937 | Oil & Gas Operator | Oct 2025 |
| 12 | Branch Oil & Gas | Shelby, MT 59474-0766 | Oil & Gas Operator | Jul 2010 |
| 13 | Branch, Jerry L. | | Oil & Gas Operator | Jul 1999 |
| 14 | Brandon Oil Company | Sunburst, MT 59482 | Oil & Gas Operator | Feb 2023 |
| 15 | Brown, J. Burns Operating Co. | Havre, MT 59501 | Oil & Gas Operator | Dec 2025 |
| 16 | Buckley, Michael T. | Sweetgrass, MT 59484 | Oil & Gas Operator | Jul 2025 |
| 17 | Bye, April & Scott | Kevin, MT 59454 | Oil & Gas Operator | Sep 2025 |
| 18 | Cavalier Petroleum | Shelby, MT 59474 | Oil & Gas Operator | Oct 2014 |
| 19 | Chelin LLC | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2025 |
| 20 | Comanche Drilling Company | Cut Bank, MT 59427 | Oil & Gas Operator | Oct 2025 |
| 21 | Coolidge, G. B., Inc. | Shelby, MT 59474 | Oil & Gas Operator | Aug 2016 |
| 22 | Coolidge, Paul | | Oil Operator | Sep 2025 |
| 23 | Coolidge, Timothy J & Billiette Nebel | Kevin, MT 59454 | Oil Operator | Sep 2025 |
| 24 | Croft Petroleum Co. | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2022 |
| 25 | D & H Energy, LLC | Shelby, MT 59474 | Oil & Gas Operator | Nov 2025 |
| 26 | D & M Welding LLC | Kevin, MT 59454 | Oil & Gas Operator | Dec 2025 |
| 27 | D.C. Oil | Natalia, TX 78059 | Oil Operator | Feb 2026 |
| 28 | Dankbar, LLC | Kevin, MT 59454 | Oil Operator | Dec 2025 |
| 29 | Dart Oil & Gas Corporation | Mason, MI 48854 | Oil & Gas Operator | Jun 2018 |
| 30 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2025 |
| 31 | Dry Coulee Oil & Gas Company | Oilmont, MT 59466 | Oil Operator | Oct 2003 |
| 32 | Empire Utilities LTD | | Oil & Gas Operator | Mar 2002 |
| 33 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 34 | Enclave Operating, LLC | Shelby, MT 59474 | Oil & Gas Operator | May 2014 |
| 35 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Feb 2023 |
| 36 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 37 | Equitable Resources Energy Co, Western Region | Billings, MT 59102 | Oil & Gas Operator | May 1997 |
| 38 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 39 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2026 |
| 40 | Fulton Fuel Company | Shelby, MT 59474 | Oil & Gas Operator | Oct 2025 |
| 41 | Fulton Producing Co. | Shelby, MT 59474-0603 | Oil & Gas Operator | Feb 2005 |
| 42 | Fulton, William M. | Shelby, MT 59474 | Oil & Gas Operator | Feb 2005 |
| 43 | Great Northern Drilling Company | Billings, MT 59103 | Oil & Gas Operator | Jun 2016 |
| 44 | Griffon Petroleum, Inc. | Calgary, AB T2P 3K2 | Oil & Gas Operator | May 2007 |
| 45 | Gypsy Highview Gathering System, Inc. | Cut Bank, MT 59427-0250 | Oil & Gas Operator | Oct 2000 |
| 46 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 47 | Hawkins, Robert S. | Kevin, MT 59454 | Oil Operator | Jun 2018 |
| 48 | Hofland, James D. | Kevin, MT 59454 | Oil & Gas Operator | Dec 2025 |
| 49 | Home-Stake Oil & Gas Company | Plano, TX 75093 | Oil & Gas Operator | Sep 2025 |
| 50 | HR Energy LLC | Shelby, MT 59474 | Oil & Gas Operator | Dec 2025 |
| 51 | Intermountain Operating, Inc. | Billings, MT 59103 | Oil & Gas Operator | Jul 2001 |
| 52 | J & G Operating | Shelby, MT 59474 | Oil & Gas Operator | Aug 2000 |
| 53 | J H Oil Company (James Hofland) | Kevin, MT 59454 | Oil & Gas Operator | Jun 2015 |
| 54 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 55 | Keesun Corporation | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2025 |
| 56 | King-Sherwood Oil | Condon, MT 59826 | Oil Operator | Dec 2025 |
| 57 | Kipling Energy Incorporated | Shelby, MT 59474 | Oil & Gas Operator | Jan 2011 |
| 58 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 59 | Knaup, Harry J. & Lucille | Shelby, MT 59474 | Oil Operator | Oct 2023 |
| 60 | Lamarsa Corp. | Cut Bank, MT 59427 | Oil & Gas Operator | Nov 2025 |
| 61 | Lyon, John J. | Bozeman, MT 59718 | Oil & Gas Operator | Jun 2022 |
| 62 | Macum Energy Inc | Billings, MT 59104 | Oil & Gas Operator | Aug 2021 |
| 63 | McCarthy, Lawrence J. | Plains, MT 59859-9215 | Oil & Gas Operator | Nov 2011 |
| 64 | McCullis Resources Co., Inc. | Littleton, CO 80161 | Oil & Gas Operator | Dec 2025 |
| 65 | McOil Montana One LLC | Vancouver, BC V6Z2W5 | Gas Operator | Aug 2025 |
| 66 | MCR, LLC | Shelby, MT 59474 | Oil & Gas Operator | Oct 2025 |
| 67 | Miller, Frank I. | Cut Bank, MT 59427 | Oil & Gas Operator | Sep 2025 |
| 68 | Misc Oil Co | Oilmont, MT 59466 | Oil Operator | Dec 2025 |
| 69 | Montalban Oil & Gas Operations, Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2025 |
| 70 | Montana Oil Field Acquisition I, LLC | Rutherford, NJ 07070 | Oil Operator | Jun 2016 |
| 71 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |
| 72 | Montana Power Gas Company | | Oil & Gas Operator | Apr 2002 |
| 73 | Mountain Pacific General Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Jun 2022 |
| 74 | Natural Gas Processing Company | Worland, WY 82401 | Oil & Gas Operator | Dec 2025 |
| 75 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 76 | Northern Producing LLC | Shelby, MT 59474 | Oil Operator | Nov 2025 |
| 77 | Northstar Gas Company, Inc. | | Oil & Gas Operator | Jan 2016 |
| 78 | Northwestern Corporation | Butte, MT 59701 | Oil & Gas Operator | Dec 2025 |
| 79 | Northwestern Energy, LLC | Butte, MT 59701 | Oil & Gas Operator | Dec 2004 |
| 80 | NRC Development, LLC | | Gas Operator | Nov 2002 |
| 81 | Omimex Canada, LTD. | Fort Worth, TX 76120-3608 | Oil & Gas Operator | Dec 2025 |
| 82 | Parsell, R. W. | Whitlash, MT 59545 | Oil & Gas Operator | Nov 2025 |
| 83 | Parsell, RF Partnership | Bellevue, WA 98004 | Oil Operator | Nov 2025 |
| 84 | Petro Productions,Petrotec Production,Inc Dba | Wichita, KS 67202 | Oil Operator | Aug 1993 |
| 85 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 86 | Phoenix Energy, Inc. | Oilmont, MT 59466 | Oil & Gas Operator | Dec 2025 |
| 87 | Phoenix Production Company | Cody, WY 82414-3607 | Oil & Gas Operator | Oct 2023 |
| 88 | Potlatch Oil & Refining Co | Shelby, MT 59474 | Oil & Gas Operator | Nov 2025 |
| 89 | Quest Petroleum Corporation | Reno, NV 89570 | Oil Operator | Apr 1998 |
| 90 | Quicksilver Resources Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2018 |
| 91 | R & B Energy, LLC | Shelby, MT 59474 | Oil Operator | Jul 2025 |
| 92 | R.C.S. Oil, Inc. | Conrad, MT 59425 | Oil Operator | Oct 2025 |
| 93 | Ranck Oil Company | Cut Bank, MT 59427 | Oil & Gas Operator | Dec 2025 |
| 94 | Rimrock Colony | Sunburst, MT 59482 | Gas Operator | Nov 2025 |
| 95 | Rimrock Oil Company | Kalispell, MT 59901 | Oil & Gas Operator | Dec 2023 |
| 96 | Robert Hawkins Inc | Kevin, MT 59454 | Oil & Gas Operator | Dec 2025 |
| 97 | Robinson Oil Company, LLC | Billings, MT 59103 | Gas Operator | Dec 2015 |
| 98 | S & W Petroleum Consultants, Inc. | Broomfield, CO 80020 | Gas Operator | Feb 2004 |
| 99 | Sands Oil Company Inc | Billings, MT 59103 | Oil & Gas Operator | Dec 2025 |
| 100 | Sauby, Warren | Kevin, MT 59454 | Oil Operator | Feb 2009 |