| 19101 | Mickalson Operating Company | Cleveland, OK 74020 | Oil & Gas Operator | Mar 2025 |
| 19102 | Mico Oil & Gas | Paola, KS 66071 | Oil Operator | Aug 1995 |
| 19103 | Micro Oil, LLC | Casa Grande, AZ 85193 | Oil Operator | Nov 2024 |
| 19104 | Micro Operating, Inc. | Bryan, TX 77807 | Oil & Gas Operator | Jun 2025 |
| 19105 | Micron Minerals Company | | Oil & Gas Operator | Sep 1988 |
| 19106 | Mid Amer Natural Resources Inc | Erie, PA 16505-4760 | Gas Operator | Dec 1994 |
| 19107 | Mid America Ener | | Oil Operator | Nov 1993 |
| 19108 | Mid Atlantic Oil Co | Hillsdale, MI 49242 | Oil & Gas Operator | Dec 1999 |
| 19109 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 19110 | Mid Central Production LLC | Evanston, WY 82930 | Oil Operator | Apr 2025 |
| 19111 | Mid Con Energy Corporation | Fort Scott, KS 66701 | Oil Operator | Dec 2009 |
| 19112 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jun 2025 |
| 19113 | Mid East Oil Co | Indiana, PA 15701-5378 | Gas Operator | Dec 2006 |
| 19114 | Mid Field Oil Co. | | Oil & Gas Operator | Mar 1989 |
| 19115 | Mid Gulf Incorpo | | Oil & Gas Operator | Nov 1993 |
| 19116 | Mid Kansas Explo | | Oil Operator | Apr 1994 |
| 19117 | Mid Kansas Gas Gathering | | Gas Operator | Feb 2025 |
| 19118 | Mid Louisiana Gas Company | | Oil & Gas Operator | Oct 2002 |
| 19119 | Mid Michigan Gas Storage Co | | Oil & Gas Operator | Mar 2022 |
| 19120 | Mid South Oil & Gas Expl Inc | | Oil & Gas Operator | Jan 1992 |
| 19121 | Mid States Energ | | Oil Operator | Aug 1985 |
| 19122 | Mid States Gener | | Oil Operator | Apr 1988 |
| 19123 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 19124 | Mid Western Oil | | Oil Operator | Oct 1989 |
| 19125 | Mid-America Energy Company, Inc. | Lebanon, MO 65536 | Oil Operator | Jul 2003 |
| 19126 | Mid-America Resources Corporation | | Oil Operator | Jan 2019 |
| 19127 | Mid-America Resources, Inc. | | Oil & Gas Operator | Feb 2008 |
| 19128 | Mid-America/Hughes & Hughes | | Oil Operator | Jul 1984 |
| 19129 | Mid-American Hyd | | Oil & Gas Operator | Jan 1992 |
| 19130 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 19131 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 19132 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 19133 | Mid-Con Petroleum Co Inc | Heath, OH 43056 | Oil & Gas Operator | Dec 2010 |
| 19134 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 19135 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Feb 2025 |
| 19136 | Mid-Continent Energy Operating | | Gas Operator | Aug 2007 |
| 19137 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 19138 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 19139 | Mid-Continent Petroleum Management Inc | Cement, OK 73017 | Oil & Gas Operator | Mar 2025 |
| 19140 | Mid-Continent Re | | Oil & Gas Operator | Jan 1993 |
| 19141 | Mid-Continental Exploration,Inc. | Sanger, TX 76266 | Oil & Gas Operator | Jun 2025 |
| 19142 | Mid-Eastern Oil & Gas Co. | Burton, WV 26562-0000 | Oil & Gas Operator | Dec 2021 |
| 19143 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 19144 | Mid-National Resources Inc. | | Oil Operator | Feb 1999 |
| 19145 | Mid-Penn Energy Corporation | Harrisburg, PA 17101-1002 | Gas Operator | Dec 2021 |
| 19146 | Mid-South Trading, Inc. | | Oil & Gas Operator | Jan 2025 |
| 19147 | Mid-States Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 19148 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 19149 | Mid-Tex Operating, Inc. | Austin, TX 78748 | Oil & Gas Operator | Jun 2025 |
| 19150 | Mid-Tex Resources | Merkel, TX 79536 | Oil & Gas Operator | Feb 2001 |
| 19151 | Mid-Way Environmental Services Inc | Stroud, OK 74079 | Oil Operator | Feb 2022 |
| 19152 | Midas Resources, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jun 2025 |
| 19153 | Midco Energy, Inc. | | Oil & Gas Operator | Dec 1992 |
| 19154 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Feb 2025 |
| 19155 | Midcoast G & P (East Texas) L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 19156 | Midcoast Resources Co | Tulsa, OK 74136 | Oil & Gas Operator | Dec 1992 |
| 19157 | Midcon Offshore, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 19158 | Midcontinent Acquisition Properties, Inc. | Oklahoma City, OK 73102 | Gas Operator | Jan 2000 |
| 19159 | Midcontinent Oil & Gas Company | Phoenix, AZ 85022-6180 | Oil & Gas Operator | Jun 2012 |
| 19160 | Middle Bay Oil Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 19161 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 19162 | Middle Fork Energy Uinta, LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 19163 | Middleton Oil Company | Houston, TX 77006 | Oil & Gas Operator | Jun 2025 |
| 19164 | Mideast Gas Systems, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2005 |
| 19165 | Midenergy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 19166 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 19167 | Midkiff, John | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 19168 | Midla, LTD. | | Oil & Gas Operator | Jun 1990 |
| 19169 | Midland Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 19170 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Jun 2025 |
| 19171 | Midland Oil Co | Brownsville, OH 43721 | Oil & Gas Operator | Dec 2000 |
| 19172 | Midland Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 19173 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 19174 | Midland Southwest Cold Lake Inc | Midland, TX 79702 | Oil & Gas Operator | Jun 1997 |
| 19175 | Midland TMG Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 19176 | Midland Workover, Inc. | | Oil & Gas Operator | Dec 2024 |
| 19177 | Midlands Gas Cor | | Gas Operator | Dec 1996 |
| 19178 | Midnight Drilling LLC | | Oil & Gas Operator | Jan 2016 |
| 19179 | Midnight Energy Operating LLC | Drumright, OK 74030 | Oil Operator | Mar 2025 |
| 19180 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 19181 | Midnight Well Se | | Oil Operator | Sep 1994 |
| 19182 | Midnite Oil Co. | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2025 |
| 19183 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 19184 | Midroc Oil Company Et Al | | Oil Operator | Nov 1984 |
| 19185 | Midroc Operating Co. & Watkins, H. Vaughan, Jr. | | Oil & Gas Operator | Feb 2010 |
| 19186 | Midroc Operating Co. & Watkins, H. Vaughan, Jr. & Placid Oil Co. | | Oil & Gas Operator | May 1991 |
| 19187 | Midroc Operating Company | | Oil & Gas Operator | Apr 2013 |
| 19188 | Midsco | Cross Plains, TX 76443 | Oil & Gas Operator | Jun 2025 |
| 19189 | Midstate Employment Services LLC | | Oil Operator | Apr 2024 |
| 19190 | Midstate Energy Inc | | Oil & Gas Operator | Aug 2017 |
| 19191 | Midstate Oil & Gas Company | Shawnee, OK 74801 | Oil & Gas Operator | Mar 2025 |
| 19192 | Midstates Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2025 |
| 19193 | Midstates Energy Operating, LLC | FT Myers, FL 33912 | Oil Operator | Feb 2025 |
| 19194 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 19195 | Midstates Petroleum Company LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2018 |
| 19196 | Midstates Petroleum Corp. | | Oil & Gas Operator | Dec 2008 |
| 19197 | Midville Energy, LLC. | Midland, TX 79705 | Oil & Gas Operator | Jul 2024 |
| 19198 | Midway City Gas Company | Huntington, WV 25701 | Oil & Gas Operator | Dec 2018 |
| 19199 | Midway Drilling | | Oil & Gas Operator | Dec 1996 |
| 19200 | Midway Drilling Co. | Richmond, TX 77469 | Oil & Gas Operator | Jun 2025 |