| 3101 | Mid-National Resources Inc. | | Oil Operator | Feb 1999 |
| 3102 | Mid-South Trading, Inc. | | Oil & Gas Operator | Jan 2025 |
| 3103 | Middle Bay Oil Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 3104 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 3105 | Mideast Gas Systems, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2005 |
| 3106 | Midla, LTD. | | Oil & Gas Operator | Jun 1990 |
| 3107 | Midland Workover, Inc. | | Oil & Gas Operator | Dec 2024 |
| 3108 | Midnight Drilling LLC | | Oil & Gas Operator | Jan 2016 |
| 3109 | Midroc Operating Company | | Oil & Gas Operator | Apr 2013 |
| 3110 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 3111 | Midstates Petroleum Company LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2018 |
| 3112 | Midstates Petroleum Corp. | | Oil & Gas Operator | Dec 2008 |
| 3113 | Midway Production Co. | | Gas Operator | May 1990 |
| 3114 | Midway Testing Company Inc | | Gas Operator | Mar 1984 |
| 3115 | Midwest Energy Companies, Inc. | | Oil & Gas Operator | Feb 1998 |
| 3116 | Midwest Enterprises Inc | Cashion, OK 73016-9626 | Oil & Gas Operator | Apr 2025 |
| 3117 | Mike Bonner | | Oil Operator | Aug 1999 |
| 3118 | Mike Revere | | Oil & Gas Operator | Jul 1991 |
| 3119 | Mil-Cro Inc. | | Oil Operator | Jan 1994 |
| 3120 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 3121 | Miles Oil & Gas Co. | | Oil & Gas Operator | Feb 1988 |
| 3122 | Millennium Offshore Group, Inc. | Houston, TX 77007 | Oil & Gas Operator | Sep 2005 |
| 3123 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 3124 | Miller Oil Field Services, Inc | | Oil Operator | Feb 1990 |
| 3125 | Miller S.W.D., Inc. | | Oil Operator | Oct 2002 |
| 3126 | Milton Crow,Inc.&RP Evans Etal | | Oil & Gas Operator | Aug 1988 |
| 3127 | Milton Galoob | | Oil Operator | Dec 1988 |
| 3128 | Milton Oil & Gas Management | | Oil & Gas Operator | Jul 1988 |
| 3129 | Minatome Corpora | | Oil & Gas Operator | Sep 1987 |
| 3130 | Minden Oil & Gas, Inc. | | Oil & Gas Operator | May 1985 |
| 3131 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 3132 | Mineral Equipment Co Inc. | | Oil & Gas Operator | May 1998 |
| 3133 | Mineral Ventures, Inc. | | Oil & Gas Operator | Dec 2024 |
| 3134 | Minerex Engineering Corp. | | Oil & Gas Operator | Mar 2004 |
| 3135 | Miocene Oil & Gas, LTD. | Englewood, CO 80110 | Oil & Gas Operator | Feb 2026 |
| 3136 | Miss Chub LLC | | Gas Operator | Dec 2024 |
| 3137 | Miss-Lou Oil Producers Inc | | Oil & Gas Operator | Dec 1998 |
| 3138 | Miss-Lou Operating LLC | | Oil & Gas Operator | Dec 2025 |
| 3139 | Miss-Lou Petroleum LLC | | Oil & Gas Operator | Jun 2011 |
| 3140 | Mission Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 3141 | Mission Exploration, Inc. | Fate, TX 75132 | Oil & Gas Operator | Dec 1987 |
| 3142 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 3143 | Mission River Systems, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Feb 2026 |
| 3144 | Mississippi River Transm. Corp | | Oil & Gas Operator | Sep 2002 |
| 3145 | Mississippi Ventures | | Gas Operator | Feb 1992 |
| 3146 | Mitchell Energy & Goodrich Oil | | Oil & Gas Operator | Feb 1985 |
| 3147 | Mitchell Energy Company L.P. | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |
| 3148 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 3149 | MJ Energy LLC | Denver, CO 80206 | Oil Operator | Jan 2025 |
| 3150 | MJ Energy, LLC Of Arkansas | | Oil Operator | Jan 2025 |
| 3151 | MJB Production Company, Inc. | Brownfield, TX 79316 | Oil & Gas Operator | Feb 2026 |
| 3152 | ML Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 3153 | MLGW | | Gas Operator | Sep 1984 |
| 3154 | Mobil E&P N.A.-Pel-Tex | | Oil & Gas Operator | Dec 1993 |
| 3155 | Mobil E&P N.A.-WM Scully Et Al | | Oil & Gas Operator | Dec 1993 |
| 3156 | Mobil E&P North America Inc. | | Oil & Gas Operator | Jan 1994 |
| 3157 | Mobil Oil E & P Southeast Inc | | Oil & Gas Operator | Sep 2013 |
| 3158 | Mobil Oil E&P Se Inc - Pel-Tex | | Oil & Gas Operator | Dec 2005 |
| 3159 | Mobley & Davis | | Oil & Gas Operator | Oct 1986 |
| 3160 | Mobley & McCain | | Oil & Gas Operator | Nov 1979 |
| 3161 | Mobley & McCain, Et Al | | Oil & Gas Operator | Jul 1986 |
| 3162 | Mobley Oil Company, Inc. | | Oil & Gas Operator | Feb 1990 |
| 3163 | Mobley Valve Service, Inc. | | Oil & Gas Operator | Nov 2006 |
| 3164 | Moco Operating Company | | Oil & Gas Operator | Mar 2002 |
| 3165 | Mole Operating Co., Inc. | | Oil & Gas Operator | Oct 1983 |
| 3166 | Monarch Petroleum Corporation | FT Worth, TX 76102 | Oil & Gas Operator | Dec 2019 |
| 3167 | Monex | | Oil Operator | Apr 1988 |
| 3168 | Monexco, Inc. | | Oil Operator | Dec 2003 |
| 3169 | Mongrue Oil Company, Inc. | | Oil & Gas Operator | Oct 1999 |
| 3170 | Mongrue, Roland, Inc | | Oil & Gas Operator | Mar 1979 |
| 3171 | Monroe Gas Associates-1 | | Gas Operator | Mar 2000 |
| 3172 | Monroe Gas Associates-2 | | Gas Operator | Mar 2000 |
| 3173 | Monroe Gas Joint Venture | | Gas Operator | Sep 2011 |
| 3174 | Monroe Well Ser-Amsterdam | | Oil Operator | Dec 1988 |
| 3175 | Monroe Well Ser-La Petr Assoc | | Oil Operator | Dec 1988 |
| 3176 | Monroe Well Ser-La Petro II | | Oil Operator | Dec 1988 |
| 3177 | Monroe Well Ser-New American85 | | Oil Operator | Dec 1988 |
| 3178 | Monroe Well Ser-Ocean Petr '84 | | Oil & Gas Operator | Dec 1988 |
| 3179 | Monroe Well Ser-Ocean Yacht II | | Oil Operator | May 1989 |
| 3180 | Monroe Well Ser-Oceanyacht1985 | | Oil Operator | Dec 1988 |
| 3181 | Monroe Well Ser-Riverside 1985 | | Oil Operator | Dec 1988 |
| 3182 | Monroe Well Serv-New American | | Oil Operator | Dec 1988 |
| 3183 | Monroe Well Serv-Northern La | | Oil Operator | Dec 1988 |
| 3184 | Monroe Well Serv-Omega 1985 | | Oil Operator | Dec 1988 |
| 3185 | Monroe Well Service | | Oil & Gas Operator | Apr 1998 |
| 3186 | Monroe Well Service-Ajk | | Oil Operator | Dec 1988 |
| 3187 | Monroe Well Service-Apk | | Oil Operator | Dec 1988 |
| 3188 | Monroe Well Service-Beaver1985 | | Oil Operator | Nov 1991 |
| 3189 | Monroe Well Service-Broadway | | Oil Operator | Dec 1988 |
| 3190 | Monroe Well Service-BWK | | Oil Operator | Dec 1988 |
| 3191 | Monroe Well Service-Columbus | | Oil Operator | Dec 1988 |
| 3192 | Monroe Well Service-Das | | Oil Operator | Mar 1989 |
| 3193 | Monroe Well Service-Derrick | | Oil Operator | Dec 1988 |
| 3194 | Monroe Well Service-East End | | Oil Operator | Dec 1988 |
| 3195 | Monroe Well Service-Empire | | Oil Operator | Dec 1988 |
| 3196 | Monroe Well Service-Energy | | Oil Operator | Dec 1988 |
| 3197 | Monroe Well Service-Energy 84 | | Oil Operator | Aug 1989 |
| 3198 | Monroe Well Service-Ged | | Oil Operator | Dec 1988 |
| 3199 | Monroe Well Service-Gotham | | Oil Operator | Apr 1992 |
| 3200 | Monroe Well Service-Gramercy | | Oil Operator | May 1992 |