| 18001 | Malone Oil Production | La Vernia, TX 78121 | Oil & Gas Operator | Jun 2025 |
| 18002 | Malone-Killen Oil Expl. Co. | | Oil Operator | Apr 1992 |
| 18003 | Maloney Helen V Dba Penn-Ok Corporation | Hockessin, DE 19707-9640 | Oil & Gas Operator | Dec 2024 |
| 18004 | Malpais Inc | Prague, OK 74864 | Gas Operator | Mar 2025 |
| 18005 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 18006 | Malvern Group Inc | Clearwater, FL 33758-6817-6817 | Oil & Gas Operator | Mar 2005 |
| 18007 | Maly & Maly Oil | Beggs, OK 74421-2844 | Oil & Gas Operator | Mar 2025 |
| 18008 | Mamerow Energy Corp | Ganado, TX 77962 | Oil & Gas Operator | Jun 2025 |
| 18009 | Mammoser, Donald | Eden, NY 14057 | Gas Operator | Dec 2023 |
| 18010 | Mammoth Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2023 |
| 18011 | Mammoth Operating LLC | Spicewood, TX 78669 | Oil Operator | Jun 2025 |
| 18012 | Mammoth Service Group, LLC | | Oil & Gas Operator | Mar 2025 |
| 18013 | Manana Gas Inc | Albuquerque, NM 87122 | Oil & Gas Operator | Apr 2025 |
| 18014 | Mancal Resources Corporation | | Oil & Gas Operator | Aug 2019 |
| 18015 | Mance, Patricia M. | Eden, NY 14057 | Gas Operator | Dec 2023 |
| 18016 | Manchester Oil Co | | Oil Operator | Jan 2000 |
| 18017 | Mancuso, Richard L. | Le Roy, NY 14482 | Gas Operator | Dec 2023 |
| 18018 | Mandalay Oil & Gas, L.L.C. | | Oil & Gas Operator | May 2008 |
| 18019 | Mandalay Trading Services Inc. | | Oil Operator | Jul 1999 |
| 18020 | Mandarin Oil & Gas Company | Austin, TX 78714 | Oil & Gas Operator | Jun 2025 |
| 18021 | Mandina & Murphy Oil Company | | Oil Operator | Nov 1990 |
| 18022 | Mandujano, Alfonso & Olga | Von Ormy, TX 78073 | Oil & Gas Operator | Dec 2014 |
| 18023 | Mandujano, Alfonso, Jr. | Von Ormy, TX 78073 | Oil Operator | Jun 2025 |
| 18024 | Manewal Bradley Oil Company | Newcastle, WY 82701 | Oil & Gas Operator | Aug 2013 |
| 18025 | Maney McNeal Oil & Gas | | Oil & Gas Operator | Dec 1999 |
| 18026 | Manhattan Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 18027 | Manis Oil & Gas Inc | Blanchard, OK 73010 | Oil & Gas Operator | Mar 2025 |
| 18028 | Manitou Explor Co Inc | Granville, OH 43023 | Oil & Gas Operator | Dec 1997 |
| 18029 | Manley Energy Resources LLC | | Oil Operator | Jan 2018 |
| 18030 | Manley, John D. III, Oper., Inc | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Feb 2016 |
| 18031 | Mann Energy, Inc. | Charleston, WV 25332-3242 | Oil & Gas Operator | Nov 2018 |
| 18032 | Mann Oil Company, LLC | | Oil Operator | Jun 2023 |
| 18033 | Mann Production Co., Inc. | | Oil Operator | Nov 1995 |
| 18034 | Manna Corporation | Oklahoma City, OK 73162 | Oil & Gas Operator | Dec 2014 |
| 18035 | Manna Minerals, Inc. | | Oil & Gas Operator | Apr 1989 |
| 18036 | Manning, Gregory | Ellinwood, KS 67526 | Oil Operator | Feb 2025 |
| 18037 | Manning, Jack | Odessa, TX 79760 | Oil & Gas Operator | Dec 2003 |
| 18038 | Mannon L. Walters, Inc. | | Oil & Gas Operator | Jun 2024 |
| 18039 | Manns' Atp, Inc. | Potwin, KS 67123 | Oil Operator | Nov 2024 |
| 18040 | Manolo Energy, Inc. | | Oil Operator | Sep 1996 |
| 18041 | Manorado Oil Company | | Oil Operator | Feb 1999 |
| 18042 | Manta Petroleum, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2020 |
| 18043 | Mantex Inc | Tulsa, OK 74114-6234 | Oil & Gas Operator | Mar 2015 |
| 18044 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 18045 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Jun 2025 |
| 18046 | Manti Tarka Permian Op, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2025 |
| 18047 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Jun 2025 |
| 18048 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Mar 2025 |
| 18049 | Manufacturers Light & Heat Co | Pittsburgh, PA 15219 | Gas Operator | Dec 1986 |
| 18050 | Manursing Island Prod. Corp. | | Oil & Gas Operator | Sep 2002 |
| 18051 | Manx Inc | Pleasantville, PA 16341-1229 | Oil Operator | Dec 2020 |
| 18052 | Manx Oil Corporation | Casper, WY 82601 | Oil & Gas Operator | Jun 2010 |
| 18053 | Manzanita Corporation | Midland, TX 79710 | Oil & Gas Operator | Nov 2008 |
| 18054 | Manzanita Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 18055 | Manzano LLC | Roswell, NM 88202 | Oil & Gas Operator | Jun 2025 |
| 18056 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 18057 | Manziel Interests | Tyler, TX 75711 | Oil & Gas Operator | Jun 2004 |
| 18058 | Manziel Management Corporation | Tyler, TX 75711 | Oil Operator | Feb 2014 |
| 18059 | Map Associates, L.P. | | Oil & Gas Operator | Mar 1995 |
| 18060 | Map Drilling Company | | Oil & Gas Operator | Apr 2012 |
| 18061 | Map Oil Co. | | Oil Operator | Jan 1978 |
| 18062 | Map Production Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2025 |
| 18063 | Mapco Inc | Billings, MT 59102 | Oil & Gas Operator | Dec 1983 |
| 18064 | Mapco Oil & Gas Company | Tulsa, OK 74101-2115 | Oil & Gas Operator | Jan 1985 |
| 18065 | Mapco Oil Company | | Oil & Gas Operator | Jan 1985 |
| 18066 | Mapco Production Co | Billings, MT 59102 | Oil & Gas Operator | Apr 1994 |
| 18067 | Maple Energy Holdings, LLC | Houston, TX 77007 | Oil & Gas Operator | Sep 2023 |
| 18068 | Maple Grove Enterprises Inc | Rimersburg, PA 16248-6415 | Oil & Gas Operator | Dec 2024 |
| 18069 | Maple Gulf Coast Props. Corp. | | Oil & Gas Operator | Jun 1989 |
| 18070 | Maple Lane Farms Dairy And Grain LLC | Marietta, NY 13110 | Gas Operator | Dec 2023 |
| 18071 | Maple Leaf Energ | | Oil & Gas Operator | Sep 1989 |
| 18072 | Maple Properties Corp | Dallas, TX 75204 | Oil & Gas Operator | Jan 1999 |
| 18073 | Mar Oil & Gas Corp. | Santa Fe, NM 87502 | Oil & Gas Operator | Apr 2025 |
| 18074 | Mar Oil Company | Upper Sandusky, OH 43351 | Oil & Gas Operator | Dec 2023 |
| 18075 | Mar-Bar Enterprises Inc | Cushing, OK 74023-3031 | Oil Operator | Mar 2025 |
| 18076 | Mar-Bec Energy Company, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | May 2001 |
| 18077 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Feb 2025 |
| 18078 | Mar-Low Corporation | | Oil & Gas Operator | Mar 1992 |
| 18079 | Mar-Win Development Co. | | Oil & Gas Operator | Nov 1988 |
| 18080 | Mar/Reg Investments | Irving, TX 75016 | Oil & Gas Operator | Jul 1999 |
| 18081 | Mar/Reg Oil Company | Reno, NV 89511 | Oil & Gas Operator | Apr 2025 |
| 18082 | Maralex Resources Inc | Ignacio, CO 81137 | Oil & Gas Operator | Apr 2025 |
| 18083 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 18084 | Maralo, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 18085 | Maram Energy Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2024 |
| 18086 | Maran Oil Company | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2020 |
| 18087 | Maran Oil Company, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2022 |
| 18088 | Maranatha Energy Corporation | Athens, WV 24712 | Oil & Gas Operator | Dec 2021 |
| 18089 | Maranatha Exploration Inc | Killbuck, OH 44637 | Oil & Gas Operator | Dec 1992 |
| 18090 | Maranatha Exploration, LP | Wichita Falls, TX 76307 | Oil Operator | Feb 2012 |
| 18091 | Maranatha Oil Company | Gonzales, TX 78629 | Oil & Gas Operator | Jun 2025 |
| 18092 | Maranatha Petroleum Inc. | | Oil & Gas Operator | Mar 2025 |
| 18093 | Marata Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 18094 | Marathon Corporation | | Oil Operator | Dec 1994 |
| 18095 | Marathon Oil Co.-Rocky Mountain Region | Cody, WY 82414 | Oil Operator | Dec 1999 |
| 18096 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 18097 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Apr 2025 |
| 18098 | Marathon Oil Company Operator | | Oil & Gas Operator | Dec 1993 |
| 18099 | Marathon Oil Company/Fina | | Oil & Gas Operator | Jan 2005 |
| 18100 | Marathon Oil Ef LLC | Houston, TX 77252 | Oil & Gas Operator | Jun 2025 |