| 18101 | Mark & Troy Johnson | Sugar Grove, PA 16350-5938 | Oil Operator | Dec 2024 |
| 18102 | Mark A & Michael J Midlik | Warren, PA 16365-2029 | Oil & Gas Operator | Dec 2015 |
| 18103 | Mark A Meier Dba MSC Oil And Gas Co | Oklahoma City, OK 73105 | Oil & Gas Operator | Jun 2025 |
| 18104 | Mark F Preddy & Associates,Inc | | Oil & Gas Operator | Dec 1987 |
| 18105 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | Jun 2025 |
| 18106 | Mark I Oil Company | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 18107 | Mark III Oil, Inc. | Wichita, KS 67206 | Oil Operator | Dec 2009 |
| 18108 | Mark IV Energy | San Antonio, TX 78213 | Oil & Gas Operator | Apr 1993 |
| 18109 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Jul 2025 |
| 18110 | Mark Oil, Inc. | Chanute, KS 66720 | Oil Operator | Feb 2025 |
| 18111 | Mark Petroleum Inc | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2018 |
| 18112 | Mark Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 1987 |
| 18113 | Mark Resources Corp | Pittsburgh, PA 15276 | Oil & Gas Operator | Dec 1993 |
| 18114 | Mark Seifer | | Oil & Gas Operator | Dec 2024 |
| 18115 | Mark T. Kellner Oil Co. | Olean, NY 14760 | Oil & Gas Operator | Dec 2024 |
| 18116 | Mark V Petroleum Company | | Oil & Gas Operator | Feb 2020 |
| 18117 | Markan Oil Incor | | Oil Operator | Mar 1991 |
| 18118 | Markay Oil & Gas Company | Midland, TX 79701 | Oil & Gas Operator | Sep 1998 |
| 18119 | Marker Oil Compa | | Oil Operator | Jul 1985 |
| 18120 | Market Street Energy, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Oct 2025 |
| 18121 | Markham, Charles A., Jr. & Janet E. | Gowanda, NY 14070 | Gas Operator | Dec 2024 |
| 18122 | Markley Exploration | Bixby, OK 74008-5332 | Oil & Gas Operator | Jan 2014 |
| 18123 | Markley L C Corporation | Fletcher, OK 73541 | Oil & Gas Operator | Aug 2002 |
| 18124 | Marks & Co., Inc. | | Oil & Gas Operator | Dec 2021 |
| 18125 | Marks And Garner Production LTD Co | Hobbs, NM 88241 | Oil & Gas Operator | Sep 2010 |
| 18126 | Marks Operating LLC | | Oil & Gas Operator | Jul 2016 |
| 18127 | Marksmen Energy USA Inc | Worthington, OH 43085-1270 | Oil Operator | Dec 2023 |
| 18128 | Markus Production | Littleton, CO 80123 | Oil & Gas Operator | Jun 2025 |
| 18129 | Markus Production, Inc | | Oil & Gas Operator | Mar 2021 |
| 18130 | Markwest Resources Inc | Englewood, CO 801125004 | Oil & Gas Operator | Jun 2003 |
| 18131 | Marlan Anderson | | Oil Operator | Jan 2025 |
| 18132 | Marler Philip | Purcell, OK 73080-1522 | Oil & Gas Operator | Nov 2016 |
| 18133 | Marlin And Davis | | Oil Operator | Sep 1987 |
| 18134 | Marlin Coastal, L.L.C. | | Oil & Gas Operator | Apr 2008 |
| 18135 | Marlin Energy Offshore, L.L.C. | | Oil & Gas Operator | Jun 2006 |
| 18136 | Marlin Energy Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2018 |
| 18137 | Marlin Energy Southwest GP, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Oct 2025 |
| 18138 | Marlin Expl.,Inc&Exchg O&G Co | | Oil & Gas Operator | Jun 1987 |
| 18139 | Marlin Exploration, Inc. | | Oil & Gas Operator | Oct 2006 |
| 18140 | Marlin Exploration, LLC | | Oil & Gas Operator | Jul 2025 |
| 18141 | Marlin Oil Company LLC | Gillette, WY 82718 | Oil & Gas Operator | Mar 2023 |
| 18142 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Jun 2025 |
| 18143 | Marlin Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Jul 2025 |
| 18144 | Marlin Pacific Oil & Gas | | Oil & Gas Operator | Dec 2003 |
| 18145 | Marlin Resources, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jan 2025 |
| 18146 | Marlin, Bruce W | | Oil Operator | Jun 2025 |
| 18147 | Marline Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 1989 |
| 18148 | Marline Petroleum Corporation | | Oil & Gas Operator | Dec 1985 |
| 18149 | Marlow Environmental LLC | Marlow, OK 73055 | Oil Operator | May 2022 |
| 18150 | Marlyn Company | | Oil & Gas Operator | Dec 2009 |
| 18151 | Marmac Petroleum | | Oil & Gas Operator | Oct 1994 |
| 18152 | Marmac Petroleum Company | Denver, CO 80222 | Oil Operator | Apr 1998 |
| 18153 | Marmac Resources Co. | | Oil & Gas Operator | Mar 2015 |
| 18154 | Marmac Resources Inc | | Oil Operator | Nov 1998 |
| 18155 | Marmaton Oil Company | Houston, TX 77002 | Oil & Gas Operator | Jul 1998 |
| 18156 | Marmik Oil Compa | | Oil Operator | Jun 1995 |
| 18157 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 18158 | Maroon Energy LLC | Spring, TX 77379 | Oil & Gas Operator | Feb 2025 |
| 18159 | Maroski, Inc. | | Oil Operator | Jan 1989 |
| 18160 | Marple Petroleum LLC | Edmond, OK 73013 | Oil Operator | Jun 2025 |
| 18161 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 18162 | Marquis Resources, LLC | | Oil & Gas Operator | Jul 2021 |
| 18163 | Marquis-Allred Eng Inc | | Oil & Gas Operator | Apr 1992 |
| 18164 | Marquise Oil Properties Inc | Konawa, OK 74849 | Oil & Gas Operator | Nov 1992 |
| 18165 | Marr Company | | Oil & Gas Operator | Mar 1989 |
| 18166 | Marr, M. H. | Dallas, TX 75201 | Gas Operator | Jan 2002 |
| 18167 | Marrow, N. S. | Austin, TX 78703 | Oil & Gas Operator | Aug 2012 |
| 18168 | Marrs Bros Oil Co Inc | Drumright, OK 74030 | Oil Operator | Sep 1994 |
| 18169 | Marrs, Richard L.(Deceased) | Arkansas City, KS 67005 | Oil & Gas Operator | Feb 2013 |
| 18170 | Marsh Engineering, Inc. | | Oil & Gas Operator | Dec 1990 |
| 18171 | Marsh Lonnie C | Konawa, OK 74849 | Oil & Gas Operator | May 2025 |
| 18172 | Marsh Oil & Gas Company | Oklahoma City, OK 73118 | Oil & Gas Operator | Jun 2025 |
| 18173 | Marsh Oil & Gas Field Services, Inc | Sebree, KY 42455 | Oil & Gas Operator | Dec 2023 |
| 18174 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Jun 2025 |
| 18175 | Marsha Azar | | Oil & Gas Operator | Jan 2017 |
| 18176 | Marshall & McCain | | Oil & Gas Operator | Oct 1988 |
| 18177 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2025 |
| 18178 | Marshall Energy, Inc. | Dallas, TX 75243 | Oil & Gas Operator | May 1997 |
| 18179 | Marshall Exploration, Inc. | | Oil & Gas Operator | Jun 1992 |
| 18180 | Marshall Lew L O | | Oil Operator | Jun 1994 |
| 18181 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 18182 | Marshall Oil, LLC | Eureka, KS 67045 | Oil Operator | Jun 2025 |
| 18183 | Marshall Petroleum, Inc. | Houston, TX 77040 | Oil & Gas Operator | Aug 2003 |
| 18184 | Marshall Pipe & Supply Co. | Nocona, TX 76255 | Oil & Gas Operator | Mar 2008 |
| 18185 | Marshall Prod. & Energy Inc. | | Oil & Gas Operator | Jan 1992 |
| 18186 | Marshall Production Co Inc | | Oil & Gas Operator | Jun 1989 |
| 18187 | Marshall R Young Oil Co | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 1996 |
| 18188 | Marshall R. Young Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 18189 | Marshall Richard R | Jeromesville, OH 44840 | Oil & Gas Operator | Dec 2023 |
| 18190 | Marshall Young Oil Co | | Oil & Gas Operator | Jan 2007 |
| 18191 | Marshall, A. B. | Houston, TX 77050 | Oil & Gas Operator | Sep 1995 |
| 18192 | Marshall, Dale | | Gas Operator | Dec 1995 |
| 18193 | Marshall, Sam | Granbury, TX 76048 | Oil & Gas Operator | Aug 2010 |
| 18194 | Marshall, Samuel Meek, Estate Of | Granbury, TX 76048 | Oil & Gas Operator | Oct 2025 |
| 18195 | Marshco Production LLC | Colorado City, TX 79512 | Oil Operator | Oct 2025 |
| 18196 | Marshel Inv | | Oil Operator | Oct 1991 |
| 18197 | Marshfield Oil & Gas, LLC | Houston, TX 77070 | Oil & Gas Operator | Oct 2025 |
| 18198 | Marshland Exploration Company | | Oil & Gas Operator | May 2006 |
| 18199 | Martec Petroleum | | Oil Operator | Jan 1984 |
| 18200 | Martens & Peck Operating Co | | Gas Operator | Feb 1997 |