| 18101 | Manning, Gregory | Ellinwood, KS 67526 | Oil Operator | Jun 2025 |
| 18102 | Manning, Jack | Odessa, TX 79760 | Oil & Gas Operator | Dec 2003 |
| 18103 | Mannon L. Walters, Inc. | | Oil & Gas Operator | Jun 2024 |
| 18104 | Manns' Atp, Inc. | Potwin, KS 67123 | Oil Operator | Jun 2025 |
| 18105 | Manolo Energy, Inc. | | Oil Operator | Sep 1996 |
| 18106 | Manorado Oil Company | | Oil Operator | Feb 1999 |
| 18107 | Manta Petroleum, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2020 |
| 18108 | Mantex Inc | Tulsa, OK 74114-6234 | Oil & Gas Operator | Mar 2015 |
| 18109 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 18110 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Dec 2025 |
| 18111 | Manti Tarka Permian Op, LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 18112 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Dec 2025 |
| 18113 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 18114 | Manufacturers Light & Heat Co | Pittsburgh, PA 15219 | Gas Operator | Dec 1986 |
| 18115 | Manursing Island Prod. Corp. | | Oil & Gas Operator | Sep 2002 |
| 18116 | Manx Inc | Pleasantville, PA 16341-1229 | Oil Operator | Dec 2020 |
| 18117 | Manx Oil Corporation | Casper, WY 82601 | Oil & Gas Operator | Jun 2010 |
| 18118 | Manzanita Corporation | Midland, TX 79710 | Oil & Gas Operator | Nov 2008 |
| 18119 | Manzanita Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 18120 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 18121 | Manzano, LLC | Roswell, NM 88202 | Oil & Gas Operator | Dec 2025 |
| 18122 | Manziel Interests | Tyler, TX 75711 | Oil & Gas Operator | Jun 2004 |
| 18123 | Manziel Management Corporation | Tyler, TX 75711 | Oil Operator | Feb 2014 |
| 18124 | Map Associates, L.P. | | Oil & Gas Operator | Mar 1995 |
| 18125 | Map Drilling Company | | Oil & Gas Operator | Apr 2012 |
| 18126 | Map Oil Co. | | Oil Operator | Jan 1978 |
| 18127 | Map Production Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 18128 | Mapco Inc | Billings, MT 59102 | Oil & Gas Operator | Dec 1983 |
| 18129 | Mapco Oil & Gas Company | Tulsa, OK 74101-2115 | Oil & Gas Operator | Jan 1985 |
| 18130 | Mapco Oil Company | | Oil & Gas Operator | Jan 1985 |
| 18131 | Mapco Production Co | Billings, MT 59102 | Oil & Gas Operator | Apr 1994 |
| 18132 | Maple Energy Holdings, LLC | Houston, TX 77007 | Oil & Gas Operator | Sep 2023 |
| 18133 | Maple Grove Enterprises Inc | Rimersburg, PA 16248-6415 | Oil & Gas Operator | Dec 2024 |
| 18134 | Maple Gulf Coast Props. Corp. | | Oil & Gas Operator | Jun 1989 |
| 18135 | Maple Lane Farms Dairy And Grain LLC | Marietta, NY 13110 | Gas Operator | Dec 2024 |
| 18136 | Maple Leaf Energ | | Oil & Gas Operator | Sep 1989 |
| 18137 | Maple Properties Corp | Dallas, TX 75204 | Oil & Gas Operator | Jan 1999 |
| 18138 | Mapleton Gas Pipeline, Inc. | Mapleton, KS 66754 | Gas Operator | Jun 2011 |
| 18139 | Mar Oil & Gas Corp. | Santa Fe, NM 87502 | Oil & Gas Operator | Oct 2025 |
| 18140 | Mar Oil Company | Upper Sandusky, OH 43351 | Oil & Gas Operator | Dec 2023 |
| 18141 | Mar-Bar Enterprises Inc | Cushing, OK 74023-3031 | Oil Operator | Sep 2025 |
| 18142 | Mar-Bec Energy Company, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | May 2001 |
| 18143 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Jun 2025 |
| 18144 | Mar-Low Corporation | | Oil & Gas Operator | Mar 1992 |
| 18145 | Mar-Win Development Co. | | Oil & Gas Operator | Nov 1988 |
| 18146 | Mar/Reg Investments | Irving, TX 75016 | Oil & Gas Operator | Jul 1999 |
| 18147 | Mar/Reg Oil Company | Reno, NV 89511 | Oil & Gas Operator | Sep 2025 |
| 18148 | Maralex Resources Inc | Ignacio, CO 81137 | Oil & Gas Operator | Oct 2025 |
| 18149 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 18150 | Maralo, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 18151 | Maram Energy Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2024 |
| 18152 | Maran Oil Company | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2020 |
| 18153 | Maran Oil Company, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2022 |
| 18154 | Maranatha Energy Corporation | Athens, WV 24712 | Oil & Gas Operator | Dec 2021 |
| 18155 | Maranatha Exploration Inc | Killbuck, OH 44637 | Oil & Gas Operator | Dec 1992 |
| 18156 | Maranatha Exploration, LP | Wichita Falls, TX 76307 | Oil Operator | Feb 2012 |
| 18157 | Maranatha Oil Company | Gonzales, TX 78629 | Oil & Gas Operator | Dec 2025 |
| 18158 | Maranatha Petroleum Inc. | | Oil & Gas Operator | Sep 2025 |
| 18159 | Marata Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 18160 | Marathon Corporation | | Oil Operator | Dec 1994 |
| 18161 | Marathon Oil Co.-Rocky Mountain Region | Cody, WY 82414 | Oil Operator | Dec 1999 |
| 18162 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 18163 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 18164 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | Oct 2025 |
| 18165 | Marathon Oil Company Operator | | Oil & Gas Operator | Dec 1993 |
| 18166 | Marathon Oil Company/Fina | | Oil & Gas Operator | Jan 2005 |
| 18167 | Marathon Oil Ef LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 18168 | Marathon Oil Permian LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 18169 | Marben Corporation | | Oil Operator | Jul 1995 |
| 18170 | Marbet LLC | Edmond, OK 73013-6691 | Oil & Gas Operator | Oct 2025 |
| 18171 | Marbil Oil, Inc. | Olney, TX 76374 | Oil & Gas Operator | Jun 2013 |
| 18172 | Marbob Energy Corp | Artesia, NM 882110227 | Oil & Gas Operator | Oct 2010 |
| 18173 | Marchman, J. E. | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 18174 | Marco Drilling Inc | Monroeville, PA 15146-0278 | Oil & Gas Operator | Dec 2024 |
| 18175 | Marco Land & Petroleum, Inc. | | Oil & Gas Operator | Jun 2000 |
| 18176 | Marco Oil Compan | | Oil & Gas Operator | Aug 1992 |
| 18177 | Marco Oil Company | Sparta, KY 41086 | Oil Operator | Dec 2021 |
| 18178 | Marco Oil Company LLC | Bartlesville, OK 74005 | Oil & Gas Operator | Aug 2025 |
| 18179 | Marco Polo Exploration, Inc. | Rosenberg, TX 77471 | Oil & Gas Operator | Dec 1993 |
| 18180 | Marcon Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2011 |
| 18181 | Marconi Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 1997 |
| 18182 | Marcum Drilling Co. | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 18183 | Marcus Exploration Inc | Piedmont, OK 73078-0308 | Oil & Gas Operator | Dec 2000 |
| 18184 | Mardale Drilling Company | Oklahoma City, OK 73157 | Oil Operator | Nov 1998 |
| 18185 | Marden Petroleum Exp Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 1990 |
| 18186 | Marden Producing | | Gas Operator | Aug 1990 |
| 18187 | Marden Producing Company | Edmond, OK 73083 | Gas Operator | Jun 2025 |
| 18188 | Mare Energy | Danville, OH 43014 | Oil & Gas Operator | Dec 2021 |
| 18189 | Mare Energy LLC | Danville, OH 43014 | Oil & Gas Operator | Dec 2024 |
| 18190 | Marexco | | Oil & Gas Operator | Nov 1994 |
| 18191 | Marexco, Inc. | Castle Rock, CO 80104 | Oil & Gas Operator | Jun 2025 |
| 18192 | Margaret Merganser Inc | Tionesta, PA 16353-5853 | Oil & Gas Operator | Dec 2008 |
| 18193 | Maria L. Andrade | | Oil Operator | Dec 2006 |
| 18194 | Mariacher, Matthew | Elma, NY 14059 | Gas Operator | Dec 2023 |
| 18195 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 18196 | Mariah Exploration LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Oct 2008 |
| 18197 | Mariah Operating Company, LLC | Denver, CO 80201 | Oil & Gas Operator | Dec 2009 |
| 18198 | Marianas Operating Co. | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 18199 | Marieff Petroleum, Inc. | Sagamore Hills, OH 44067 | Gas Operator | Dec 2024 |
| 18200 | Marienfeld Exploration | Houston, TX 77005 | Oil & Gas Operator | Mar 1994 |