| 18201 | Magnum Oilfield Services LLC | Bakersfield, CA 93309 | Oil Operator | Apr 2025 |
| 18202 | Magnum Operating, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 18203 | Magnum Petroleum, Inc. | Palm Desert, CA 92260 | Oil & Gas Operator | Nov 2013 |
| 18204 | Magnum Producing & Operating Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jan 2004 |
| 18205 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 18206 | Magnum Production & Well Service | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2025 |
| 18207 | Magnusson Karl E | | Oil Operator | Apr 1987 |
| 18208 | Magpie Operating, Inc | | Oil & Gas Operator | Feb 2025 |
| 18209 | Magruder '81, LTD. | Midland, TX 79701 | Oil & Gas Operator | Jan 1995 |
| 18210 | Magruder, Edwin H., Jr. | Midland, TX 79701 | Oil & Gas Operator | Oct 2019 |
| 18211 | Maguire James Q Inc | Norman, OK 73070-1748 | Oil & Gas Operator | Jun 2011 |
| 18212 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 18213 | Maha Energy Us Inc | | Oil Operator | Nov 2023 |
| 18214 | Mahan Jim And Janet | Collinsville, OK 74021 | Oil & Gas Operator | Jan 2025 |
| 18215 | Mahfouz Energy Company | Houston, TX 77255 | Oil & Gas Operator | Nov 2020 |
| 18216 | Mahl, Matthew J. | Springville, NY 14141 | Gas Operator | Dec 2023 |
| 18217 | Mahler & Scott | Ruidoso, NM 88355 | Oil & Gas Operator | Aug 2003 |
| 18218 | Mahler, Kelly Operating | Graham, TX 76450 | Oil & Gas Operator | Mar 2017 |
| 18219 | Mahue Construction Company | Huntington, WV 25724-2345 | Oil & Gas Operator | Dec 2021 |
| 18220 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2024 |
| 18221 | Mai Operations | | Oil Operator | Dec 1996 |
| 18222 | Maier Resources Inc | Oklahoma City, OK 73157-2996 | Oil & Gas Operator | Mar 2015 |
| 18223 | Maier, H Paul | | Oil Operator | Dec 2023 |
| 18224 | Main Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 2009 |
| 18225 | Main Street Royalty, Inc. | Lockhart, TX 78644 | Oil & Gas Operator | Aug 1999 |
| 18226 | Maines, Wendy R. | Irving, NY 14081 | Gas Operator | Dec 2023 |
| 18227 | Mainspring LLC | Uhrichsville, OH 44683 | Oil & Gas Operator | Dec 2023 |
| 18228 | Maintainer Energy Res Corp Inc | Morris, OK 74445-2663 | Oil Operator | Jan 2025 |
| 18229 | Majestic Energy Company LLC | Keifer, OK 74041 | Oil Operator | Jan 2025 |
| 18230 | Majestic Energy Corporation | Shreveport, LA 71164 | Oil & Gas Operator | May 2013 |
| 18231 | Majestic Management Corp | | Oil Operator | Dec 2013 |
| 18232 | Majestic Oil & Gas Holding Co. | Midland, TX 79705 | Oil Operator | Apr 2025 |
| 18233 | Majestic Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | May 2007 |
| 18234 | Majestic Petroleum Corporation | Dallas, TX 75230 | Oil & Gas Operator | Oct 1996 |
| 18235 | Majestic Petroleum Operations Inc | Story, WY 82842 | Gas Operator | Mar 2007 |
| 18236 | Majestic Resources, Inc. | Dripping SPGS, TX 78620 | Oil & Gas Operator | Nov 2007 |
| 18237 | Majoil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 1996 |
| 18238 | Major Oil Co LLC | Drumright, OK 74030 | Oil & Gas Operator | Apr 2020 |
| 18239 | Major Oil Compan | | Oil Operator | Mar 1988 |
| 18240 | Majors Eugene E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Jan 2025 |
| 18241 | Majors Gary E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Dec 2024 |
| 18242 | Majors Jimmy R | Osceola, NE 68651-0726 | Oil & Gas Operator | Sep 2000 |
| 18243 | Majors John Dba Majors Production Co | Weleetka, OK 74880 | Oil & Gas Operator | Jan 2025 |
| 18244 | Majors Michael | Holdenville, OK 74848-0531 | Oil & Gas Operator | Sep 1994 |
| 18245 | Mak Oil & Gas Co | | Oil Operator | Mar 2009 |
| 18246 | Mak-J Energy Partners(TX),LTD. | Denver, CO 80206 | Oil & Gas Operator | Sep 2013 |
| 18247 | Mak-J Energy Wyoming LLC | Denver, CO 80620 | Oil & Gas Operator | Nov 2012 |
| 18248 | Makar Production Company | Amarillo, TX 79118 | Oil & Gas Operator | Apr 2025 |
| 18249 | Makk Oil Production Inc. | Monahans, TX 79756 | Oil & Gas Operator | Apr 2025 |
| 18250 | Mako Exploration Management, LLC | Shreveport, LA 71105 | Oil & Gas Operator | Apr 2025 |
| 18251 | Mako Operating Company, LLC | Andover, KS 67002 | Gas Operator | May 2002 |
| 18252 | Makoil, Inc. | Lake Forest, CA 92630 | Oil & Gas Operator | Jul 2007 |
| 18253 | Maledon Enterprises | Austin, TX 78738 | Oil & Gas Operator | Feb 1996 |
| 18254 | Malka Production Company | Oklahoma City, OK 73101-0248 | Oil & Gas Operator | Jan 2000 |
| 18255 | Mallard Drilling Corp. | | Oil & Gas Operator | Jan 1993 |
| 18256 | Mallard Exploration, Inc. | | Oil & Gas Operator | Sep 1975 |
| 18257 | Mallard Oil & Gas | Cody, WY 82414-9640 | Oil & Gas Operator | Oct 2019 |
| 18258 | Mallard Operating LLC | | Oil & Gas Operator | Nov 2024 |
| 18259 | Mallard Petroleum, Inc. | | Oil & Gas Operator | Apr 1986 |
| 18260 | Mallett Luke-Dba Mallett Energy | New Concord, OH 43762 | Oil & Gas Operator | Dec 2016 |
| 18261 | Mallon Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2005 |
| 18262 | Mallonee-Mahoney | | Oil & Gas Operator | Dec 1994 |
| 18263 | Mallorn Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Jan 2025 |
| 18264 | Mallory, Meredith, Jr. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2002 |
| 18265 | Malmac Energy Corp. | | Oil & Gas Operator | Jul 1987 |
| 18266 | Malone Donald J | | Oil Operator | Nov 1993 |
| 18267 | Malone Oil & Gas Exploration, Inc. | | Oil Operator | Dec 2018 |
| 18268 | Malone Oil Co. | | Oil & Gas Operator | Jul 2006 |
| 18269 | Malone Oil Compa | | Oil Operator | Dec 1994 |
| 18270 | Malone Oil Production | La Vernia, TX 78121 | Oil & Gas Operator | Apr 2025 |
| 18271 | Malone-Killen Oil Expl. Co. | | Oil Operator | Apr 1992 |
| 18272 | Maloney Helen V Dba Penn-Ok Corporation | Hockessin, DE 19707-9640 | Oil & Gas Operator | Dec 2024 |
| 18273 | Malpais Inc | Prague, OK 74864 | Gas Operator | Jan 2025 |
| 18274 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 18275 | Malvern Group Inc | Clearwater, FL 33758-6817-6817 | Oil & Gas Operator | Mar 2005 |
| 18276 | Maly & Maly Oil | Beggs, OK 74421-2844 | Oil & Gas Operator | Jan 2025 |
| 18277 | Mamerow Energy Corp | Ganado, TX 77962 | Oil & Gas Operator | Apr 2025 |
| 18278 | Mammoser, Donald | Eden, NY 14057 | Gas Operator | Dec 2023 |
| 18279 | Mammoth Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2023 |
| 18280 | Mammoth Operating LLC | Spicewood, TX 78669 | Oil Operator | Apr 2025 |
| 18281 | Mammoth Resource, LLC | | Oil & Gas Operator | Dec 2008 |
| 18282 | Mammoth Service Group, LLC | | Oil & Gas Operator | Jan 2025 |
| 18283 | Manana Gas Inc | Albuquerque, NM 87122 | Oil & Gas Operator | Jan 2025 |
| 18284 | Mancal Resources Corporation | | Oil & Gas Operator | Aug 2019 |
| 18285 | Mance, Patricia M. | Eden, NY 14057 | Gas Operator | Dec 2023 |
| 18286 | Manchester Oil Co | | Oil Operator | Jan 2000 |
| 18287 | Mancuso, Richard L. | Le Roy, NY 14482 | Gas Operator | Dec 2023 |
| 18288 | Mandalay Oil & Gas, L.L.C. | | Oil & Gas Operator | May 2008 |
| 18289 | Mandalay Trading Services Inc. | | Oil Operator | Jul 1999 |
| 18290 | Mandarin Oil & Gas Company | Austin, TX 78714 | Oil & Gas Operator | Apr 2025 |
| 18291 | Mandina & Murphy Oil Company | | Oil Operator | Nov 1990 |
| 18292 | Mandujano, Alfonso & Olga | Von Ormy, TX 78073 | Oil & Gas Operator | Dec 2014 |
| 18293 | Mandujano, Alfonso, Jr. | Von Ormy, TX 78073 | Oil Operator | Apr 2025 |
| 18294 | Manewal Bradley Oil Company | Newcastle, WY 82701 | Oil & Gas Operator | Aug 2013 |
| 18295 | Maney McNeal Oil & Gas | | Oil & Gas Operator | Dec 1999 |
| 18296 | Manhattan Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 18297 | Manis Oil & Gas Inc | Blanchard, OK 73010-6654 | Oil & Gas Operator | Dec 2024 |
| 18298 | Manitou Explor Co Inc | Granville, OH 43023 | Oil & Gas Operator | Dec 1997 |
| 18299 | Manley Energy Resources LLC | | Oil Operator | Jan 2018 |
| 18300 | Manley, John D. III, Oper., Inc | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Feb 2016 |