| 17901 | Mallard Exploration, Inc. | | Oil & Gas Operator | Sep 1975 |
| 17902 | Mallard Oil & Gas | Cody, WY 82414-9640 | Oil & Gas Operator | Oct 2019 |
| 17903 | Mallard Operating LLC | | Oil & Gas Operator | Nov 2024 |
| 17904 | Mallard Petroleum, Inc. | | Oil & Gas Operator | Apr 1986 |
| 17905 | Mallett Luke-Dba Mallett Energy | New Concord, OH 43762 | Oil & Gas Operator | Dec 2016 |
| 17906 | Mallon Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2005 |
| 17907 | Mallonee-Mahoney | | Oil & Gas Operator | Dec 1994 |
| 17908 | Mallorn Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Apr 2025 |
| 17909 | Mallory, Meredith, Jr. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2002 |
| 17910 | Malmac Energy Corp. | | Oil & Gas Operator | Jul 1987 |
| 17911 | Malone Donald J | | Oil Operator | Nov 1993 |
| 17912 | Malone Oil & Gas Exploration, Inc. | | Oil Operator | Dec 2018 |
| 17913 | Malone Oil Co. | | Oil & Gas Operator | Jul 2006 |
| 17914 | Malone Oil Compa | | Oil Operator | Dec 1994 |
| 17915 | Malone Oil Production | La Vernia, TX 78121 | Oil & Gas Operator | Jul 2025 |
| 17916 | Malone-Killen Oil Expl. Co. | | Oil Operator | Apr 1992 |
| 17917 | Maloney Helen V Dba Penn-Ok Corporation | Hockessin, DE 19707-9640 | Oil & Gas Operator | Dec 2024 |
| 17918 | Malpais Inc | Prague, OK 74864 | Gas Operator | Apr 2025 |
| 17919 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 17920 | Malvern Group Inc | Clearwater, FL 33758-6817 | Oil & Gas Operator | Mar 2005 |
| 17921 | Maly & Maly Oil | Beggs, OK 74421-2844 | Oil & Gas Operator | Apr 2025 |
| 17922 | Mamerow Energy Corp | Ganado, TX 77962 | Oil & Gas Operator | Jul 2025 |
| 17923 | Mammoth Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2023 |
| 17924 | Mammoth Operating LLC | Spicewood, TX 78669 | Oil Operator | Jul 2025 |
| 17925 | Mammoth Service Group, LLC | | Oil & Gas Operator | Apr 2025 |
| 17926 | Manana Gas Inc | Albuquerque, NM 87122 | Oil & Gas Operator | May 2025 |
| 17927 | Mancal Resources Corporation | | Oil & Gas Operator | Aug 2019 |
| 17928 | Mance, Patricia M. | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 17929 | Manchester Oil Co | | Oil Operator | Jan 2000 |
| 17930 | Mancuso, Richard L. | Le Roy, NY 14482 | Gas Operator | Dec 2024 |
| 17931 | Mandalay Oil & Gas, L.L.C. | | Oil & Gas Operator | May 2008 |
| 17932 | Mandalay Trading Services Inc. | | Oil Operator | Jul 1999 |
| 17933 | Mandarin Oil & Gas Company | Austin, TX 78714 | Oil & Gas Operator | Jul 2025 |
| 17934 | Mandina & Murphy Oil Company | | Oil Operator | Nov 1990 |
| 17935 | Mandujano, Alfonso & Olga | Von Ormy, TX 78073 | Oil & Gas Operator | Dec 2014 |
| 17936 | Mandujano, Alfonso, Jr. | Von Ormy, TX 78073 | Oil Operator | Jul 2025 |
| 17937 | Manewal Bradley Oil Company | Newcastle, WY 82701 | Oil & Gas Operator | Aug 2013 |
| 17938 | Maney McNeal Oil & Gas | | Oil & Gas Operator | Dec 1999 |
| 17939 | Manhattan Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 17940 | Manis Oil & Gas Inc | Blanchard, OK 73010 | Oil & Gas Operator | Mar 2025 |
| 17941 | Manitou Explor Co Inc | Granville, OH 43023 | Oil & Gas Operator | Dec 1997 |
| 17942 | Manley Energy Resources LLC | | Oil Operator | Jan 2018 |
| 17943 | Manley, John D. III, Oper., Inc | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Feb 2016 |
| 17944 | Mann Energy, Inc. | Charleston, WV 25332-3242 | Oil & Gas Operator | Nov 2018 |
| 17945 | Mann Oil Company, LLC | | Oil Operator | Jun 2023 |
| 17946 | Mann Production Co., Inc. | | Oil Operator | Nov 1995 |
| 17947 | Manna Corporation | Oklahoma City, OK 73162 | Oil & Gas Operator | Dec 2014 |
| 17948 | Manna Minerals, Inc. | | Oil & Gas Operator | Apr 1989 |
| 17949 | Manning, Gregory | Ellinwood, KS 67526 | Oil Operator | Mar 2025 |
| 17950 | Manning, Jack | Odessa, TX 79760 | Oil & Gas Operator | Dec 2003 |
| 17951 | Mannon L. Walters, Inc. | | Oil & Gas Operator | Jun 2024 |
| 17952 | Manns' Atp, Inc. | Potwin, KS 67123 | Oil Operator | Nov 2024 |
| 17953 | Manolo Energy, Inc. | | Oil Operator | Sep 1996 |
| 17954 | Manorado Oil Company | | Oil Operator | Feb 1999 |
| 17955 | Manta Petroleum, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2020 |
| 17956 | Mantex Inc | Tulsa, OK 74114-6234 | Oil & Gas Operator | Mar 2015 |
| 17957 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 17958 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Jul 2025 |
| 17959 | Manti Tarka Permian Op, LLC | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 17960 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Jul 2025 |
| 17961 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | May 2025 |
| 17962 | Manufacturers Light & Heat Co | Pittsburgh, PA 15219 | Gas Operator | Dec 1986 |
| 17963 | Manursing Island Prod. Corp. | | Oil & Gas Operator | Sep 2002 |
| 17964 | Manx Inc | Pleasantville, PA 16341-1229 | Oil Operator | Dec 2020 |
| 17965 | Manx Oil Corporation | Casper, WY 82601 | Oil & Gas Operator | Jun 2010 |
| 17966 | Manzanita Corporation | Midland, TX 79710 | Oil & Gas Operator | Nov 2008 |
| 17967 | Manzanita Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 17968 | Manzano LLC | Roswell, NM 88202 | Oil & Gas Operator | Jul 2025 |
| 17969 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 17970 | Manziel Interests | Tyler, TX 75711 | Oil & Gas Operator | Jun 2004 |
| 17971 | Manziel Management Corporation | Tyler, TX 75711 | Oil Operator | Feb 2014 |
| 17972 | Map Associates, L.P. | | Oil & Gas Operator | Mar 1995 |
| 17973 | Map Drilling Company | | Oil & Gas Operator | Apr 2012 |
| 17974 | Map Oil Co. | | Oil Operator | Jan 1978 |
| 17975 | Map Production Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 17976 | Mapco Inc | Billings, MT 59102 | Oil & Gas Operator | Dec 1983 |
| 17977 | Mapco Oil & Gas Company | Tulsa, OK 74101-2115 | Oil & Gas Operator | Jan 1985 |
| 17978 | Mapco Oil Company | | Oil & Gas Operator | Jan 1985 |
| 17979 | Mapco Production Co | Billings, MT 59102 | Oil & Gas Operator | Apr 1994 |
| 17980 | Maple Energy Holdings, LLC | Houston, TX 77007 | Oil & Gas Operator | Sep 2023 |
| 17981 | Maple Grove Enterprises Inc | Rimersburg, PA 16248-6415 | Oil & Gas Operator | Dec 2024 |
| 17982 | Maple Gulf Coast Props. Corp. | | Oil & Gas Operator | Jun 1989 |
| 17983 | Maple Lane Farms Dairy And Grain LLC | Marietta, NY 13110 | Gas Operator | Dec 2024 |
| 17984 | Maple Leaf Energ | | Oil & Gas Operator | Sep 1989 |
| 17985 | Maple Properties Corp | Dallas, TX 75204 | Oil & Gas Operator | Jan 1999 |
| 17986 | Mar Oil & Gas Corp. | Santa Fe, NM 87502 | Oil & Gas Operator | May 2025 |
| 17987 | Mar Oil Company | Upper Sandusky, OH 43351 | Oil & Gas Operator | Dec 2023 |
| 17988 | Mar-Bar Enterprises Inc | Cushing, OK 74023-3031 | Oil Operator | Apr 2025 |
| 17989 | Mar-Bec Energy Company, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | May 2001 |
| 17990 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Mar 2025 |
| 17991 | Mar-Low Corporation | | Oil & Gas Operator | Mar 1992 |
| 17992 | Mar-Win Development Co. | | Oil & Gas Operator | Nov 1988 |
| 17993 | Mar/Reg Investments | Irving, TX 75016 | Oil & Gas Operator | Jul 1999 |
| 17994 | Mar/Reg Oil Company | Reno, NV 89511 | Oil & Gas Operator | May 2025 |
| 17995 | Maralex Resources Inc | Ignacio, CO 81137 | Oil & Gas Operator | May 2025 |
| 17996 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 17997 | Maralo, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 17998 | Maram Energy Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2024 |
| 17999 | Maran Oil Company | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2020 |
| 18000 | Maran Oil Company, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2022 |