| 2901 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Apr 2024 |
| 2902 | Mertz Energy LLC | Houston, TX 77098 | Oil & Gas Operator | Jan 2024 |
| 2903 | Mesa Gulf Coast LLC | | Oil & Gas Operator | Dec 2020 |
| 2904 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 2905 | Mesa Petroleum Co. | | Oil & Gas Operator | Aug 1985 |
| 2906 | Mescalero Energy, Inc. | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 2907 | Metairie Energy Company, Inc. | | Oil & Gas Operator | Nov 2019 |
| 2908 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 2909 | Mettz,Carmody & Foster Oil Co | | Oil Operator | May 1990 |
| 2910 | Meyers-Lasher, Inc. | | Oil & Gas Operator | Mar 1999 |
| 2911 | MFP Petroleum LTD. Partnership | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2017 |
| 2912 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 2913 | Mich-La Oil & Gas Exploration | | Oil & Gas Operator | Jan 1992 |
| 2914 | Michael D Brown | | Oil Operator | Jul 1993 |
| 2915 | Michael W Mills | | Oil Operator | Jul 2007 |
| 2916 | Michel T. Halbouty | | Oil & Gas Operator | Dec 1996 |
| 2917 | Michel T. Halbouty Energy Co. | | Oil & Gas Operator | Nov 1986 |
| 2918 | Michigan-Wisconsin Pipe Line Co | | Oil & Gas Operator | Dec 1983 |
| 2919 | Micron Minerals Company | | Oil & Gas Operator | Sep 1988 |
| 2920 | Mid Field Oil Co. | | Oil & Gas Operator | Mar 1989 |
| 2921 | Mid Louisiana Gas Company | | Oil & Gas Operator | Oct 2002 |
| 2922 | Mid South Oil & Gas Expl Inc | | Oil & Gas Operator | Jan 1992 |
| 2923 | Mid-America Resources Corporation | | Oil Operator | Jan 2019 |
| 2924 | Mid-America Resources, Inc. | | Oil & Gas Operator | Feb 2008 |
| 2925 | Mid-America/Hughes & Hughes | | Oil Operator | Jul 1984 |
| 2926 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 2927 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2024 |
| 2928 | Mid-Continent Energy Operating | | Gas Operator | Aug 2007 |
| 2929 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 2930 | Mid-National Resources Inc. | | Oil Operator | Feb 1999 |
| 2931 | Mid-South Trading, Inc. | | Oil & Gas Operator | Jan 2024 |
| 2932 | Middle Bay Oil Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 2933 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 2934 | Mideast Gas Systems, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2005 |
| 2935 | Midla, LTD. | | Oil & Gas Operator | Jun 1990 |
| 2936 | Midland Workover, Inc. | | Oil & Gas Operator | Jan 2024 |
| 2937 | Midnight Drilling LLC | | Oil & Gas Operator | Jan 2016 |
| 2938 | Midroc Operating Company | | Oil & Gas Operator | Apr 2013 |
| 2939 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 2940 | Midstates Petroleum Company LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2018 |
| 2941 | Midstates Petroleum Corp. | | Oil & Gas Operator | Dec 2008 |
| 2942 | Midway Production Co. | | Gas Operator | May 1990 |
| 2943 | Midwest Energy Companies, Inc. | | Oil & Gas Operator | Feb 1998 |
| 2944 | Midwest Enterprises, Inc. | Cashion, OK 73016-9626 | Oil & Gas Operator | Jan 2024 |
| 2945 | Mike Bonner | | Oil Operator | Aug 1999 |
| 2946 | Mil-Cro Inc. | | Oil Operator | Jan 1994 |
| 2947 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 2948 | Miles Oil & Gas Co. | | Oil & Gas Operator | Feb 1988 |
| 2949 | Millennium Offshore Group, Inc. | Houston, TX 77007 | Oil & Gas Operator | Sep 2005 |
| 2950 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 2951 | Miller Oil Field Services, Inc | | Oil Operator | Feb 1990 |
| 2952 | Miller S.W.D., Inc. | | Oil Operator | Oct 2002 |
| 2953 | Milton Crow,Inc.&RP Evans Etal | | Oil & Gas Operator | Aug 1988 |
| 2954 | Milton Galoob | | Oil Operator | Dec 1988 |
| 2955 | Minatome Corporation | | Oil & Gas Operator | Sep 1987 |
| 2956 | Minden Oil & Gas, Inc. | | Oil & Gas Operator | May 1985 |
| 2957 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 2958 | Mineral Ventures, Inc. | | Oil & Gas Operator | Dec 2023 |
| 2959 | Minerex Engineering Corp. | | Oil & Gas Operator | Mar 2004 |
| 2960 | Miocene Oil & Gas, LTD. | Englewood, CO 80110 | Oil & Gas Operator | Apr 2024 |
| 2961 | Miss Chub LLC | | Gas Operator | Dec 2023 |
| 2962 | Miss Lou Oil Producers, Inc. | | Oil & Gas Operator | Nov 1998 |
| 2963 | Miss-Lou Operating LLC | | Oil & Gas Operator | Jan 2024 |
| 2964 | Miss-Lou Petroleum LLC | | Oil & Gas Operator | Jun 2011 |
| 2965 | Mission Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 2966 | Mission Exploration, Inc. | Tolar, TX 76476 | Oil & Gas Operator | Dec 1987 |
| 2967 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 2968 | Mission River Systems, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Apr 2024 |
| 2969 | Mississippi River Transm. Corp | | Oil & Gas Operator | Sep 2002 |
| 2970 | Mississippi Ventures | | Gas Operator | Feb 1992 |
| 2971 | Mitchell Energy & Goodrich Oil | | Oil & Gas Operator | Feb 1985 |
| 2972 | Mitchell Energy Company L.P. | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |
| 2973 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 2974 | MJ Energy, LLC | Denver, CO 80206 | Oil Operator | Jan 2024 |
| 2975 | MJB Production Company, Inc. | Brownfield, TX 79316 | Oil & Gas Operator | Apr 2024 |
| 2976 | ML Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 2977 | MLGW | | Gas Operator | Sep 1984 |
| 2978 | Mobil E&P N.A.-Pel-Tex | | Oil & Gas Operator | Dec 1993 |
| 2979 | Mobil E&P N.A.-WM Scully Et Al | | Oil & Gas Operator | Dec 1993 |
| 2980 | Mobil E&P North America Inc. | | Oil & Gas Operator | Jan 1994 |
| 2981 | Mobil Oil E & P Southeast Inc | | Oil & Gas Operator | Sep 2013 |
| 2982 | Mobil Oil E&P Se Inc - Pel-Tex | | Oil & Gas Operator | Dec 2005 |
| 2983 | Mobley & Davis | | Oil & Gas Operator | Oct 1986 |
| 2984 | Mobley & McCain | | Oil & Gas Operator | Nov 1979 |
| 2985 | Mobley & McCain, Et Al | | Oil & Gas Operator | Jul 1986 |
| 2986 | Mobley Oil Company, Inc. | | Oil & Gas Operator | Feb 1990 |
| 2987 | Mobley Valve Service, Inc. | | Oil & Gas Operator | Nov 2006 |
| 2988 | Moco Operating Company | | Oil & Gas Operator | Mar 2002 |
| 2989 | Mole Operating Co., Inc. | | Oil & Gas Operator | Oct 1983 |
| 2990 | Monarch Petroleum Corporation | FT Worth, TX 76102 | Oil & Gas Operator | Dec 2019 |
| 2991 | Monex | | Oil Operator | Apr 1988 |
| 2992 | Monexco, Inc. | | Oil Operator | Dec 2003 |
| 2993 | Mongrue Oil Company, Inc. | | Oil & Gas Operator | Oct 1999 |
| 2994 | Mongrue, Roland, Inc | | Oil & Gas Operator | Mar 1979 |
| 2995 | Monroe Gas Joint Venture | | Gas Operator | Sep 2011 |
| 2996 | Monroe Well Ser-Amsterdam | | Oil Operator | Dec 1988 |
| 2997 | Monroe Well Ser-La Petr Assoc | | Oil Operator | Dec 1988 |
| 2998 | Monroe Well Ser-La Petro II | | Oil Operator | Dec 1988 |
| 2999 | Monroe Well Ser-New American85 | | Oil Operator | Dec 1988 |
| 3000 | Monroe Well Ser-Ocean Petr '84 | | Oil & Gas Operator | Dec 1988 |