| 3101 | Monroe Well Service-West End | | Oil Operator | Dec 1988 |
| 3102 | Monroe Well Service-York | | Oil Operator | Dec 1988 |
| 3103 | Monsanto Company | Indianapolis, IN 46280 | Oil & Gas Operator | Jan 2005 |
| 3104 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 3105 | Monterey Pipeline Co. | | Oil Operator | Aug 1993 |
| 3106 | Monterey Resources LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Oct 2019 |
| 3107 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 3108 | Moon-Hines-Tigrett Opr Co Inc | | Oil & Gas Operator | Oct 1995 |
| 3109 | Moore McCormack Energy, Inc. | | Oil & Gas Operator | Jul 1988 |
| 3110 | Moore Oil & Gas-Marion Corp. | | Oil & Gas Operator | Nov 1986 |
| 3111 | Moore&Munger Hydrocarbons Inc | | Oil Operator | May 1987 |
| 3112 | Mooringsport Energy Prod Corp | | Oil & Gas Operator | Oct 1994 |
| 3113 | Mooringsport Energy Trans Corp | | Oil Operator | Apr 1990 |
| 3114 | Moran Exploration, Inc. | | Oil & Gas Operator | Jan 1985 |
| 3115 | Moran Oil Co., Inc. | | Oil & Gas Operator | Aug 2009 |
| 3116 | Moransco Energy Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 3117 | Morgan Enterprises | | Oil & Gas Operator | Aug 1997 |
| 3118 | Moro Bay Oil Company, Inc. | | Oil Operator | Jan 1997 |
| 3119 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 3120 | Moseley Petroleum Corp. | | Oil & Gas Operator | Apr 1988 |
| 3121 | MRD Operating LLC | | Oil & Gas Operator | Dec 2016 |
| 3122 | Mrs. C. M. Roberson | | Oil Operator | Mar 1989 |
| 3123 | Mrs. Cecile Andries & Sons | | Oil Operator | Dec 2006 |
| 3124 | MRT Exploration Co | | Oil & Gas Operator | Feb 1983 |
| 3125 | MTBB Acquisition Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2022 |
| 3126 | Mullen Exploration Inc | | Oil & Gas Operator | Dec 2002 |
| 3127 | Mullins & Prichard | | Oil & Gas Operator | May 1992 |
| 3128 | Munday Operating Co., L.L.C. | | Oil & Gas Operator | May 2007 |
| 3129 | Munoco Company | El Dorado, AR 71730 | Oil & Gas Operator | Jul 2021 |
| 3130 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Aug 2020 |
| 3131 | Murexco Petroleum Inc | Dallas, TX 75251 | Oil & Gas Operator | Oct 1996 |
| 3132 | Murphrey Oil Company, Inc. | | Oil Operator | Jan 2025 |
| 3133 | Murphy - Sun | | Oil & Gas Operator | May 1989 |
| 3134 | Murphy Exp & Prod Co.-USA | | Oil & Gas Operator | May 2014 |
| 3135 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 3136 | Murphy Oil USA, Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 3137 | Murray J. Evans | | Oil Operator | Mar 1985 |
| 3138 | Muslow And Parker | | Oil & Gas Operator | Jul 1994 |
| 3139 | Muslow Oil Industries | | Oil Operator | Jan 1995 |
| 3140 | Mustang Energy Inc. | Porter, TX 77365 | Oil & Gas Operator | Mar 2008 |
| 3141 | Mustang Energy L C | | Oil & Gas Operator | Jan 2013 |
| 3142 | MVM Resources Louisiana L.L.C. | | Oil & Gas Operator | Jan 2025 |
| 3143 | MVP Production Inc. | | Oil & Gas Operator | Apr 2005 |
| 3144 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 3145 | N And B Exploration, Inc. | | Oil & Gas Operator | Jun 1993 |
| 3146 | N Central Casing Pullers, Inc. | | Oil & Gas Operator | May 1994 |
| 3147 | N. B. Hunt | | Oil & Gas Operator | May 1981 |
| 3148 | N. E. Loomis | | Oil Operator | Oct 1986 |
| 3149 | N. J. Pardue | | Oil & Gas Operator | Jul 1994 |
| 3150 | N. R. Price | | Oil & Gas Operator | Nov 1983 |
| 3151 | N. T. Rutledge Oil Co. | | Oil Operator | Jan 1989 |
| 3152 | N. W. Corporation | | Gas Operator | Jan 1989 |
| 3153 | Nabors Drilling Company, Inc. | | Oil & Gas Operator | Sep 1977 |
| 3154 | Nabors Well Services LTD | Houston, TX 77067-4536 | Oil Operator | Apr 2011 |
| 3155 | Nabors-Johnson Prod Co., Inc. | | Oil & Gas Operator | Dec 2020 |
| 3156 | Nacatosh Gas Incorporated | | Oil & Gas Operator | Aug 2013 |
| 3157 | Nadel & Gussman | Tulsa, OK 74103 | Oil & Gas Operator | May 2007 |
| 3158 | Nadel & Gussman-Jetta Oper. Co. | | Oil & Gas Operator | Mar 2012 |
| 3159 | Nadel And Gussman LLC | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2026 |
| 3160 | Nadel And Gussman Ruston, LLC | | Oil & Gas Operator | Dec 2024 |
| 3161 | Nasser Oil & Gas, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 3162 | Nat. Gas Pipeline Co Of Amer. | | Oil Operator | Dec 2008 |
| 3163 | Nathan C. Hale | | Oil & Gas Operator | Jan 2025 |
| 3164 | Nathan Hale Oil Co. | | Oil & Gas Operator | Jan 2025 |
| 3165 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 3166 | National Exploration Company | | Oil & Gas Operator | Mar 1982 |
| 3167 | National Offshore LP | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 3168 | Natomas North America Inc | | Oil & Gas Operator | Aug 1993 |
| 3169 | Natomas-McCormick-Coastal | | Oil & Gas Operator | Feb 1984 |
| 3170 | Natural Gas Systems, Inc. | | Oil & Gas Operator | Dec 2002 |
| 3171 | Natural Resource MGMT. Corp. | | Oil & Gas Operator | Jun 1989 |
| 3172 | Navarro Gas Production Company | | Gas Operator | Dec 1996 |
| 3173 | Navitas Resources, LLC | | Oil & Gas Operator | May 2016 |
| 3174 | Naylor-Pritchard | | Oil Operator | Jul 1987 |
| 3175 | NCM Operations, Inc. | | Oil Operator | Oct 2000 |
| 3176 | NCX Company, Inc. | | Oil & Gas Operator | Aug 1999 |
| 3177 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Sep 2026 |
| 3178 | Nebo Operating Company | | Oil & Gas Operator | Apr 1991 |
| 3179 | Needham Resources, Inc. | | Oil & Gas Operator | Jan 1998 |
| 3180 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | May 2026 |
| 3181 | Neilco | | Oil & Gas Operator | Nov 2024 |
| 3182 | Nelson Energy, Inc. | | Oil & Gas Operator | Nov 2024 |
| 3183 | Nelson Oil & Gas, Inc. | | Oil & Gas Operator | Aug 1995 |
| 3184 | Nelson Oil Corporation | | Oil Operator | Jul 1983 |
| 3185 | Nemours Corporation | | Gas Operator | Jan 1986 |
| 3186 | Neosho Operating La, LLC | | Oil Operator | Oct 2016 |
| 3187 | Nerco Oil & Gas Inc | | Oil & Gas Operator | Dec 1996 |
| 3188 | Nestor Petroleum Company | | Oil & Gas Operator | Jun 1986 |
| 3189 | Netco Energy 1 LLC | | Oil Operator | Jan 2025 |
| 3190 | Neuhoff Oil & Gas Corp. | | Oil & Gas Operator | Dec 1986 |
| 3191 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | Sep 2026 |
| 3192 | Nevanen Energy Inc | | Oil & Gas Operator | Dec 2022 |
| 3193 | New & Brasher Operating | | Oil Operator | Oct 1984 |
| 3194 | New & Hughes Drilling Co. Inc. | | Oil Operator | Jun 1983 |
| 3195 | New Century Exploration, Inc. | Spring, TX 77379 | Oil & Gas Operator | Sep 2026 |
| 3196 | New Ora Oil, Inc. | | Oil Operator | Aug 1984 |
| 3197 | New Orleans Public Service Inc | | Oil Operator | Dec 1994 |
| 3198 | New York Petroleum Corp. | | Oil & Gas Operator | Nov 1982 |
| 3199 | New-Park, Inc. | | Oil Operator | Sep 1990 |
| 3200 | Newco Inc | Oklahoma City, OK 73177 | Oil Operator | Aug 1999 |