| 18101 | Marathon Oil Permian LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 18102 | Marben Corporation | | Oil Operator | Jul 1995 |
| 18103 | Marbet LLC | Edmond, OK 73013-6691 | Oil & Gas Operator | Mar 2025 |
| 18104 | Marbil Oil, Inc. | Olney, TX 76374 | Oil & Gas Operator | Jun 2013 |
| 18105 | Marbob Energy Corp | Artesia, NM 882110227 | Oil & Gas Operator | Oct 2010 |
| 18106 | Marchman, J. E. | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 18107 | Marco Drilling Inc | Monroeville, PA 15146-0278 | Oil & Gas Operator | Dec 2024 |
| 18108 | Marco Land & Petroleum, Inc. | | Oil & Gas Operator | Jun 2000 |
| 18109 | Marco Oil Co, Inc | Sparta, KY 41086 | Oil Operator | Dec 2021 |
| 18110 | Marco Oil Compan | | Oil & Gas Operator | Aug 1992 |
| 18111 | Marco Oil Company LLC | Bartlesville, OK 74005 | Oil & Gas Operator | Mar 2025 |
| 18112 | Marco Polo Exploration, Inc. | Rosenberg, TX 77471 | Oil & Gas Operator | Dec 1993 |
| 18113 | Marcon Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2011 |
| 18114 | Marconi Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 1997 |
| 18115 | Marcum Drilling Co. | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 18116 | Marcus Exploration Inc | Piedmont, OK 73078-0308 | Oil & Gas Operator | Dec 2000 |
| 18117 | Mardale Drilling Company | Oklahoma City, OK 73157 | Oil Operator | Nov 1998 |
| 18118 | Marden Petroleum Exp Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 1990 |
| 18119 | Marden Producing | | Gas Operator | Aug 1990 |
| 18120 | Marden Producing Company | Edmond, OK 73083 | Gas Operator | Jan 2025 |
| 18121 | Mare Energy | Danville, OH 43014 | Oil & Gas Operator | Dec 2021 |
| 18122 | Mare Energy LLC | Danville, OH 43014 | Oil & Gas Operator | Dec 2023 |
| 18123 | Marexco | | Oil & Gas Operator | Nov 1994 |
| 18124 | Marexco, Inc. | Castle Rock, CO 80104 | Oil & Gas Operator | Feb 2025 |
| 18125 | Margaret Merganser Inc | Tionesta, PA 16353-5853 | Oil & Gas Operator | Dec 2008 |
| 18126 | Maria L. Andrade | | Oil Operator | Dec 2006 |
| 18127 | Mariacher, Matthew | Elma, NY 14059 | Gas Operator | Dec 2023 |
| 18128 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 18129 | Mariah Exploration LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Oct 2008 |
| 18130 | Mariah Operating Company, LLC | Denver, CO 80201 | Oil & Gas Operator | Dec 2009 |
| 18131 | Marianas Operating Co. | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 18132 | Marieff Petroleum, Inc. | Sagamore Hills, OH 44067 | Gas Operator | Dec 2023 |
| 18133 | Marienfeld Exploration | Houston, TX 77005 | Oil & Gas Operator | Mar 1994 |
| 18134 | Marienfeld Exploration, Inc. | Ojai, CA 93024 | Oil & Gas Operator | Jun 2025 |
| 18135 | Marietta Royalty Co Inc | Stillwater, OK 74076 | Oil & Gas Operator | Dec 1986 |
| 18136 | Marina Pacifica Oil Company | | Oil & Gas Operator | Dec 1981 |
| 18137 | Marine Cont. & Supply Inc. | | Oil & Gas Operator | Nov 1985 |
| 18138 | Marine Properties, Inc. | | Oil & Gas Operator | Feb 1995 |
| 18139 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 18140 | Marino, Charles B. | Tomball, TX 77377 | Oil & Gas Operator | Jun 2025 |
| 18141 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 18142 | Marion County Prod. Co., L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2025 |
| 18143 | Marion Energy Inc | Houston, TX 770082292 | Oil & Gas Operator | May 2015 |
| 18144 | Marion Operating Corp | Marion, OH 43301-0453-0453 | Oil & Gas Operator | Dec 2020 |
| 18145 | Mariposa Petroleum Co. | | Gas Operator | Dec 1980 |
| 18146 | Maritech Resources, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2009 |
| 18147 | Maritech Resources, LLC | | Oil & Gas Operator | May 2011 |
| 18148 | Marjac Energy Co | Bremen, OH 43107 | Oil & Gas Operator | Dec 1986 |
| 18149 | Marjac Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2025 |
| 18150 | Marjo Incorporat | | Oil & Gas Operator | Jun 1990 |
| 18151 | Marjo Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Oct 1999 |
| 18152 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Mar 2025 |
| 18153 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 18154 | Marjo, Inc. | | Oil & Gas Operator | Sep 1991 |
| 18155 | Mark & Troy Johnson | Sugar Grove, PA 16350-5938 | Oil Operator | Dec 2024 |
| 18156 | Mark A & Michael J Midlik | Warren, PA 16365-2029 | Oil & Gas Operator | Dec 2015 |
| 18157 | Mark A Meier Dba MSC Oil And Gas Co | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2025 |
| 18158 | Mark F Preddy & Associates,Inc | | Oil & Gas Operator | Dec 1987 |
| 18159 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | Apr 2025 |
| 18160 | Mark I Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 18161 | Mark III Oil, Inc. | Wichita, KS 67206 | Oil Operator | Dec 2009 |
| 18162 | Mark IV Energy | San Antonio, TX 78213 | Oil & Gas Operator | Apr 1993 |
| 18163 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Apr 2025 |
| 18164 | Mark Oil, Inc. | Chanute, KS 66720 | Oil Operator | Feb 2025 |
| 18165 | Mark Petroleum Inc | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2018 |
| 18166 | Mark Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 1987 |
| 18167 | Mark Resources Corp | Pittsburgh, PA 15276 | Oil & Gas Operator | Dec 1993 |
| 18168 | Mark Seifer | | Oil & Gas Operator | Dec 2024 |
| 18169 | Mark T. Kellner Oil Co. | Olean, NY 14760 | Oil & Gas Operator | Dec 2023 |
| 18170 | Mark V Petroleum Company | | Oil & Gas Operator | Feb 2020 |
| 18171 | Markan Oil Incor | | Oil Operator | Mar 1991 |
| 18172 | Markay Oil & Gas Company | Midland, TX 79701 | Oil & Gas Operator | Sep 1998 |
| 18173 | Marker Oil Compa | | Oil Operator | Jul 1985 |
| 18174 | Market Street Energy, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Jun 2025 |
| 18175 | Markham, Charles A., Jr. & Janet E. | Gowanda, NY 14070 | Gas Operator | Dec 2023 |
| 18176 | Markley Exploration | Bixby, OK 74008-5332 | Oil & Gas Operator | Jan 2014 |
| 18177 | Markley L C Corporation | Fletcher, OK 73541 | Oil & Gas Operator | Aug 2002 |
| 18178 | Marks & Co., Inc. | | Oil & Gas Operator | Dec 2021 |
| 18179 | Marks And Garner Production LTD Co | Hobbs, NM 88241 | Oil & Gas Operator | Sep 2010 |
| 18180 | Marks Operating LLC | | Oil & Gas Operator | Jul 2016 |
| 18181 | Marksmen Energy USA Inc | Worthington, OH 43085-1270-1270 | Oil Operator | Dec 2023 |
| 18182 | Markus Production | Littleton, CO 80123 | Oil & Gas Operator | Mar 2025 |
| 18183 | Markus Production, Inc | | Oil & Gas Operator | Mar 2021 |
| 18184 | Markwest Resources Inc | Englewood, CO 801125004 | Oil & Gas Operator | Jun 2003 |
| 18185 | Marlan Anderson | | Oil Operator | Jan 2025 |
| 18186 | Marler Philip | Purcell, OK 73080-1522 | Oil & Gas Operator | Nov 2016 |
| 18187 | Marlin And Davis | | Oil Operator | Sep 1987 |
| 18188 | Marlin Coastal, L.L.C. | | Oil & Gas Operator | Apr 2008 |
| 18189 | Marlin Energy Offshore, L.L.C. | | Oil & Gas Operator | Jun 2006 |
| 18190 | Marlin Energy Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2018 |
| 18191 | Marlin Energy Southwest GP, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Jun 2025 |
| 18192 | Marlin Expl.,Inc&Exchg O&G Co | | Oil & Gas Operator | Jun 1987 |
| 18193 | Marlin Exploration, Inc. | | Oil & Gas Operator | Oct 2006 |
| 18194 | Marlin Exploration, LLC | | Oil & Gas Operator | Apr 2025 |
| 18195 | Marlin Oil Company LLC | Gillette, WY 82718 | Oil & Gas Operator | Mar 2023 |
| 18196 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Mar 2025 |
| 18197 | Marlin Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Mar 2025 |
| 18198 | Marlin Pacific Oil & Gas | | Oil & Gas Operator | Dec 2003 |
| 18199 | Marlin Resources, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jan 2025 |
| 18200 | Marlin, Bruce W | | Oil Operator | Mar 2025 |