| 18101 | Ma-Si, Inc. | | Oil & Gas Operator | May 1998 |
| 18102 | Mac 5 Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Feb 2021 |
| 18103 | Mac Engineering & Operating Co | | Oil & Gas Operator | May 2005 |
| 18104 | Mac Laskey Kelly Oilfield | El Dorado, KS 67042 | Oil & Gas Operator | Feb 2025 |
| 18105 | Mac Oil Field Service Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2023 |
| 18106 | Mac Operating | Graham, TX 76450 | Oil & Gas Operator | Jun 2023 |
| 18107 | Macdonald Spidel | | Oil & Gas Operator | Dec 2021 |
| 18108 | Mace, T. A. | Oklahoma City, OK 73127 | Oil & Gas Operator | Feb 2008 |
| 18109 | Macfarlan Oil And Gas, LLC | Ellenboro, WV 26346-0058 | Oil & Gas Operator | Dec 2021 |
| 18110 | Mach Petroleum, Inc. | Tulsa, OK 74153 | Oil & Gas Operator | Nov 2014 |
| 18111 | Macha Enterprises, Inc. | Wichita Falls, TX 76309 | Oil Operator | Apr 2025 |
| 18112 | Machii-Ross Petroleum Co | | Oil & Gas Operator | Apr 2014 |
| 18113 | Machin & Associates, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2025 |
| 18114 | Macina, P.T. | Shamrock, TX 79079 | Gas Operator | Apr 2025 |
| 18115 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Feb 2025 |
| 18116 | Mack Energy Comp | | Oil & Gas Operator | Nov 1994 |
| 18117 | Mack Energy Corporation | Artesia, NM 88211 | Oil & Gas Operator | Feb 2025 |
| 18118 | Mack Oil Company | Duncan, OK 73534 | Oil & Gas Operator | Nov 2000 |
| 18119 | Mack Oil Corp | | Oil & Gas Operator | Nov 1998 |
| 18120 | Mack Oil Corp And Delta Oil Co Inc Great Lakes Nia | | Oil & Gas Operator | Feb 1986 |
| 18121 | Mack Oil Corp And Neyer Oil Inc | | Oil & Gas Operator | May 1988 |
| 18122 | Mackellar Inc | Oklahoma City, OK 73116-7101 | Oil & Gas Operator | Feb 2025 |
| 18123 | Mackenco Inc | Columbus, OH 43235 | Oil & Gas Operator | Dec 2020 |
| 18124 | Mackey Consulting & Leasing LLC | Cleveland, OK 74020 | Oil & Gas Operator | Dec 2024 |
| 18125 | Mackinaw Two, LLC | | Oil & Gas Operator | May 2020 |
| 18126 | Maclane Gas Company L.P. | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Mar 1994 |
| 18127 | Macmart Inc | Wynnewood, OK 73098 | Oil & Gas Operator | Jan 2016 |
| 18128 | Maco Incorporate | | Oil Operator | Jun 1984 |
| 18129 | Macpherson Oil Company | | Oil & Gas Operator | Dec 2024 |
| 18130 | Macpherson Operating Company L.P. | | Oil & Gas Operator | Dec 2024 |
| 18131 | Macro Oil Company | Bartlesville, OK 74006 | Oil Operator | Aug 1999 |
| 18132 | Macum Energy Inc | Billings, MT 59104 | Oil & Gas Operator | Aug 2021 |
| 18133 | Mad Dog Oil Co. | | Oil Operator | Mar 2016 |
| 18134 | Mad Operators LLC | | Oil & Gas Operator | Dec 2024 |
| 18135 | Madco Energy Corp | Logan, OH 43138 | Oil & Gas Operator | Dec 1987 |
| 18136 | Madden Ventures | Mundelein, IL 60060 | Oil & Gas Operator | Dec 2008 |
| 18137 | Maddox Energy Corporation | Dallas, TX BAD ADDR | Oil & Gas Operator | Jul 1995 |
| 18138 | Maddox Oil & Gas | | Gas Operator | Jun 1982 |
| 18139 | Maddox Oil & Gas, Inc. | | Oil Operator | Apr 1983 |
| 18140 | Maddox Operating | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2025 |
| 18141 | Maddux Oil & Gas | Strawn, TX 76475 | Oil & Gas Operator | Apr 2025 |
| 18142 | Maddux, Elizabeth H. | San Antonio, TX 78217 | Oil & Gas Operator | Nov 1995 |
| 18143 | Madera, R. F. | Palm Desert, CA 92210 | Oil & Gas Operator | Sep 2000 |
| 18144 | Madison And Wright LLC | The Colony, TX 75056 | Oil & Gas Operator | Apr 2025 |
| 18145 | Madison Brothers Investment, LLC | Brownsville, KY 42210 | Oil & Gas Operator | Dec 2023 |
| 18146 | Madison Mark T | Marienville, PA 16239-6029 | Oil & Gas Operator | Dec 2012 |
| 18147 | Madison Oil Co.-Halbouty, M. T. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1998 |
| 18148 | Madison Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1998 |
| 18149 | Madtick Dev Corp | Punxsutawney, PA 15767-1179 | Oil & Gas Operator | Dec 2024 |
| 18150 | Maersk Energy Inc. | Houston, TX 77042 | Oil & Gas Operator | Oct 1994 |
| 18151 | Maertins Production, LLC | Queen City, TX 75572 | Oil Operator | Apr 2025 |
| 18152 | Magaw & Zimmer | Perry, OK 73077-1055 | Oil & Gas Operator | Aug 2013 |
| 18153 | Magellan E&P Holdings, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jun 2021 |
| 18154 | Magellan Exploration Co LTD | Bethany, OK 73008-0909 | Oil & Gas Operator | Jun 2014 |
| 18155 | Maggard Joe | Mannford, OK 74044-9610 | Oil & Gas Operator | May 2023 |
| 18156 | Maggard Oil Co Inc | Manford, OK 74044 | Oil & Gas Operator | Sep 1997 |
| 18157 | Maggard Supply & Oil Company | Mannford, OK 74044-1407 | Oil & Gas Operator | Nov 2014 |
| 18158 | Maggard VIrginia J | Mannford, OK 74044-3027 | Oil Operator | Jan 2025 |
| 18159 | Maggert Energy Corp. | Spring, TX 77387 | Gas Operator | Jun 1998 |
| 18160 | Magic Circle Energy | Oklahoma City, OK 73185 | Oil & Gas Operator | Dec 1983 |
| 18161 | Magic City Oil & Gas | Amarillo, TX 79109 | Oil & Gas Operator | Apr 2025 |
| 18162 | Magic Investments LLC | Edmond, OK 73013-1688 | Oil & Gas Operator | Jan 2025 |
| 18163 | Magic Oil & Gas Inc. | Houston, TX 77079 | Oil & Gas Operator | Jan 2001 |
| 18164 | Magma Resources LLC | Paoli, OK 73074 | Oil & Gas Operator | Jan 2025 |
| 18165 | Magna Diversified Group, Inc. | Jacksonville, TX 75766 | Oil & Gas Operator | Oct 2013 |
| 18166 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 18167 | Magna Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 18168 | Magnatex Corp | Midland, TX 79702-1311 | Oil & Gas Operator | Feb 1995 |
| 18169 | Magnatex Petrole | | Oil Operator | Jun 1994 |
| 18170 | Magnatex Petroleum | | Oil Operator | Apr 1993 |
| 18171 | Magness Petroleum Company | | Oil & Gas Operator | Dec 1994 |
| 18172 | Magnet Oil LP | Bronte, TX 76933 | Oil & Gas Operator | Apr 2025 |
| 18173 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 18174 | Magnolia Petroleum Inc | Tulsa, OK 74106-2433 | Oil Operator | Jun 2018 |
| 18175 | Magnolia Production Co | Atlanta, TX 75551 | Oil & Gas Operator | Apr 2025 |
| 18176 | Magnolia Production Company LLC | | Oil & Gas Operator | Nov 2024 |
| 18177 | Magnum DRLG Of Ohio, Inc | Ashland, KY 41102 | Oil & Gas Operator | Dec 2023 |
| 18178 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Feb 2025 |
| 18179 | Magnum Engineering Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 18180 | Magnum Exploration Kansas, LLC | Lipan, TX 76462 | Oil Operator | Oct 2016 |
| 18181 | Magnum Gas Pipeline, L.L.C. | | Oil Operator | Dec 2024 |
| 18182 | Magnum Hunter Production, Inc. | Irving, TX 75014 | Oil & Gas Operator | Dec 2019 |
| 18183 | Magnum Hunter Resources Corporation | | Oil & Gas Operator | Nov 2019 |
| 18184 | Magnum Minerals, Inc. | | Oil & Gas Operator | May 1998 |
| 18185 | Magnum Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Jul 2000 |
| 18186 | Magnum Oil & Gas Inc. | Linn, WV 26384 | Gas Operator | Dec 2021 |
| 18187 | Magnum Oil, LLC | Hartford, KY 42347 | Oil Operator | Dec 2023 |
| 18188 | Magnum Oilfield Services LLC | Bakersfield, CA 93309 | Oil Operator | Apr 2025 |
| 18189 | Magnum Operating, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 18190 | Magnum Petroleum, Inc. | Palm Desert, CA 92260 | Oil & Gas Operator | Nov 2013 |
| 18191 | Magnum Producing & Operating Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jan 2004 |
| 18192 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 18193 | Magnum Production & Well Service | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2025 |
| 18194 | Magnusson Karl E | | Oil Operator | Apr 1987 |
| 18195 | Magpie Operating, Inc | | Oil & Gas Operator | Jan 2025 |
| 18196 | Magruder '81, LTD. | Midland, TX 79701 | Oil & Gas Operator | Jan 1995 |
| 18197 | Magruder, Edwin H., Jr. | Midland, TX 79701 | Oil & Gas Operator | Oct 2019 |
| 18198 | Maguire James Q Inc | Norman, OK 73070-1748 | Oil & Gas Operator | Jun 2011 |
| 18199 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 18200 | Maha Energy Us Inc | | Oil Operator | Nov 2023 |