| 19101 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 19102 | Mextex Operating Company | Austin, TX 78734 | Oil & Gas Operator | May 2025 |
| 19103 | Meyer Douglas P | Longmont, CO 80501 | Oil & Gas Operator | Aug 2006 |
| 19104 | Meyer Oil Co., Inc. | Skellytown, TX 79080 | Oil & Gas Operator | Feb 2025 |
| 19105 | Meyer Richard C Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 19106 | Meyer, David M. | South Wales, NY 14139 | Gas Operator | Dec 2023 |
| 19107 | Meyer, Norbert | Conway Springs, KS 67031 | Oil Operator | Aug 1994 |
| 19108 | Meyer, Ruskin H. Et Al | | Oil Operator | Oct 1980 |
| 19109 | Meyer, Theodore J. | Conway Springs, KS 67031 | Oil Operator | Jan 2025 |
| 19110 | Meyerhoff & Cox Inc | Tulsa, OK 74135-7830 | Oil Operator | Aug 1993 |
| 19111 | Meyers Marsha L | Danville, OH 43014 | Oil & Gas Operator | Dec 2007 |
| 19112 | Meyers-Lasher, Inc. | | Oil & Gas Operator | Mar 1999 |
| 19113 | MFC Drilling Inc | Coshocton, OH 43812 | Oil & Gas Operator | Dec 2024 |
| 19114 | MFP Petroleum LP | Oklahoma City, OK 73142-3017 | Gas Operator | Feb 2025 |
| 19115 | MFP Petroleum LTD. Partnership | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2017 |
| 19116 | Mga Energy Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2024 |
| 19117 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Feb 2025 |
| 19118 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 19119 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 19120 | MGM Oil & Gas Inc. | Ballinger, TX 76821 | Oil & Gas Operator | May 2025 |
| 19121 | MGM Well Service, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Oct 2004 |
| 19122 | MH Oilfield Service LLC | Amesville, OH 45711 | Oil & Gas Operator | Dec 2023 |
| 19123 | MHM Oil Co. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2002 |
| 19124 | MHM Pipeline Co., Inc. | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 19125 | Mi-Co Oil & Gas LLC | Caddo, TX 76429 | Oil Operator | May 2025 |
| 19126 | Miami Oil Producers Inc | Reno, NV 89501 | Oil & Gas Operator | Dec 2012 |
| 19127 | Mica Energy Corp. | Lincoln, NE 68516 | Oil & Gas Operator | Dec 2010 |
| 19128 | Mich Geosearch/Eagle O&G | Wichita Falls, TX 76308-1061-1061 | Oil & Gas Operator | Dec 2001 |
| 19129 | Mich-La Oil & Gas Exploration | | Oil & Gas Operator | Jan 1992 |
| 19130 | Michael D Brown | | Oil Operator | Jul 1993 |
| 19131 | Michael D. Traylor LLC | El Dorado, KS 67042 | Oil Operator | Jan 2025 |
| 19132 | Michael D. Weilert Oil Company | | Oil Operator | Jan 2025 |
| 19133 | Michael Goodnight Operating LLC | St Louis, OK 74866 | Oil & Gas Operator | Feb 2025 |
| 19134 | Michael Petr. & Hurd Ent., LTD. | Houston, TX 77056 | Oil & Gas Operator | Oct 1993 |
| 19135 | Michael Petroleum Corporation | Houston, TX 77040 | Oil & Gas Operator | Dec 2001 |
| 19136 | Michael W Mills | | Oil Operator | Jul 2007 |
| 19137 | Michaelis Leo Oi | | Oil Operator | Aug 1991 |
| 19138 | Michaels, Bobby W | | Oil Operator | Nov 1998 |
| 19139 | Michaelson Producing Company | MC Camey, TX 79752 | Oil & Gas Operator | May 2025 |
| 19140 | Michel T. Halbouty | | Oil & Gas Operator | Dec 1996 |
| 19141 | Michel T. Halbouty Energy Co. | | Oil & Gas Operator | Nov 1986 |
| 19142 | Michigan Gas Utilities Co | | Oil & Gas Operator | Mar 2011 |
| 19143 | Michigan Geosearch Inc | Lansing, MI 48917 | Oil & Gas Operator | Jan 2025 |
| 19144 | Michigan Oil Co. | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |
| 19145 | Michigan Petroleum Exploration Inc | | Oil & Gas Operator | Oct 2005 |
| 19146 | Michigan Production Co LLC | | Oil & Gas Operator | Oct 2002 |
| 19147 | Michigan-Wisconsin Pipe Line Co | | Oil & Gas Operator | Dec 1983 |
| 19148 | Mickalson Operating Company | Cleveland, OK 74020 | Oil & Gas Operator | Mar 2025 |
| 19149 | Mico Oil & Gas | Paola, KS 66071 | Oil Operator | Aug 1995 |
| 19150 | Micro Oil, LLC | Casa Grande, AZ 85193 | Oil Operator | Nov 2024 |
| 19151 | Micro Operating, Inc. | Bryan, TX 77807 | Oil & Gas Operator | May 2025 |
| 19152 | Micron Minerals Company | | Oil & Gas Operator | Sep 1988 |
| 19153 | Mid Amer Natural Resources Inc | Erie, PA 16505-4760 | Gas Operator | Dec 1994 |
| 19154 | Mid America Ener | | Oil Operator | Nov 1993 |
| 19155 | Mid Atlantic Oil Co | Hillsdale, MI 49242 | Oil & Gas Operator | Dec 1999 |
| 19156 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 19157 | Mid Central Production LLC | Evanston, WY 82930 | Oil Operator | Dec 2024 |
| 19158 | Mid Con Energy Corporation | Fort Scott, KS 66701 | Oil Operator | Dec 2009 |
| 19159 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | May 2025 |
| 19160 | Mid East Oil Co | Indiana, PA 15701-5378 | Gas Operator | Dec 2006 |
| 19161 | Mid Field Oil Co. | | Oil & Gas Operator | Mar 1989 |
| 19162 | Mid Gulf Incorpo | | Oil & Gas Operator | Nov 1993 |
| 19163 | Mid Kansas Explo | | Oil Operator | Apr 1994 |
| 19164 | Mid Kansas Gas Gathering | | Gas Operator | Jan 2025 |
| 19165 | Mid Louisiana Gas Company | | Oil & Gas Operator | Oct 2002 |
| 19166 | Mid Michigan Gas Storage Co | | Oil & Gas Operator | Mar 2022 |
| 19167 | Mid South Oil & Gas Expl Inc | | Oil & Gas Operator | Jan 1992 |
| 19168 | Mid States Energ | | Oil Operator | Aug 1985 |
| 19169 | Mid States Gener | | Oil Operator | Apr 1988 |
| 19170 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 19171 | Mid Western Oil | | Oil Operator | Oct 1989 |
| 19172 | Mid-America Energy Company, Inc. | Lebanon, MO 65536 | Oil Operator | Jul 2003 |
| 19173 | Mid-America Resources Corporation | | Oil Operator | Jan 2019 |
| 19174 | Mid-America Resources, Inc. | | Oil & Gas Operator | Feb 2008 |
| 19175 | Mid-America/Hughes & Hughes | | Oil Operator | Jul 1984 |
| 19176 | Mid-American Hyd | | Oil & Gas Operator | Jan 1992 |
| 19177 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 19178 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 19179 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 19180 | Mid-Con Petroleum Co Inc | Heath, OH 43056 | Oil & Gas Operator | Dec 2010 |
| 19181 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 19182 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2025 |
| 19183 | Mid-Continent Energy Operating | | Gas Operator | Aug 2007 |
| 19184 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 19185 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 19186 | Mid-Continent Petroleum Management Inc | Cement, OK 73017 | Oil & Gas Operator | Mar 2025 |
| 19187 | Mid-Continent Re | | Oil & Gas Operator | Jan 1993 |
| 19188 | Mid-Continental Exploration,Inc. | Sanger, TX 76266 | Oil & Gas Operator | May 2025 |
| 19189 | Mid-Eastern Oil & Gas Co. | Burton, WV 26562-0000 | Oil & Gas Operator | Dec 2021 |
| 19190 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 19191 | Mid-National Resources Inc. | | Oil Operator | Feb 1999 |
| 19192 | Mid-Penn Energy Corporation | Harrisburg, PA 17101-1002 | Gas Operator | Dec 2021 |
| 19193 | Mid-South Trading, Inc. | | Oil & Gas Operator | Jan 2025 |
| 19194 | Mid-States Operating Company | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 19195 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 19196 | Mid-Tex Operating, Inc. | Austin, TX 78748 | Oil & Gas Operator | May 2025 |
| 19197 | Mid-Tex Resources | Merkel, TX 79536 | Oil & Gas Operator | Feb 2001 |
| 19198 | Mid-Way Environmental Services Inc | Stroud, OK 74079 | Oil Operator | Feb 2022 |
| 19199 | Midas Resources, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 2025 |
| 19200 | Midco Energy, Inc. | | Oil & Gas Operator | Dec 1992 |