| 201 | Macro Oil Company | Bartlesville, OK 74006 | Oil Operator | Aug 1999 |
| 202 | Macum Energy Inc | Billings, MT 59104 | Oil & Gas Operator | Aug 2021 |
| 203 | Mad Dog Oil Co. | | Oil Operator | Mar 2016 |
| 204 | Mad Operators LLC | | Oil & Gas Operator | Dec 2024 |
| 205 | Madco Energy Corp | Logan, OH 43138 | Oil & Gas Operator | Dec 1987 |
| 206 | Madden Ventures | Mundelein, IL 60060 | Oil & Gas Operator | Dec 2008 |
| 207 | Maddox Energy Corporation | Dallas, TX BAD ADDR | Oil & Gas Operator | Jul 1995 |
| 208 | Maddox Oil & Gas | | Gas Operator | Jun 1982 |
| 209 | Maddox Oil & Gas, Inc. | | Oil Operator | Apr 1983 |
| 210 | Maddox Operating | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2025 |
| 211 | Maddux Oil & Gas | Strawn, TX 76475 | Oil & Gas Operator | Apr 2025 |
| 212 | Maddux, Elizabeth H. | San Antonio, TX 78217 | Oil & Gas Operator | Nov 1995 |
| 213 | Madera, R. F. | Palm Desert, CA 92210 | Oil & Gas Operator | Sep 2000 |
| 214 | Madison And Wright LLC | The Colony, TX 75056 | Oil & Gas Operator | Apr 2025 |
| 215 | Madison Brothers Investment, LLC | Brownsville, KY 42210 | Oil & Gas Operator | Dec 2023 |
| 216 | Madison Mark T | Marienville, PA 16239-6029 | Oil & Gas Operator | Dec 2012 |
| 217 | Madison Oil Co.-Halbouty, M. T. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1998 |
| 218 | Madison Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1998 |
| 219 | Madtick Dev Corp | Punxsutawney, PA 15767-1179 | Oil & Gas Operator | Dec 2024 |
| 220 | Maersk Energy Inc. | Houston, TX 77042 | Oil & Gas Operator | Oct 1994 |
| 221 | Maertins Production, LLC | Queen City, TX 75572 | Oil Operator | Apr 2025 |
| 222 | Magaw & Zimmer | Perry, OK 73077-1055 | Oil & Gas Operator | Aug 2013 |
| 223 | Magellan E&P Holdings, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jun 2021 |
| 224 | Magellan Exploration Co LTD | Bethany, OK 73008-0909 | Oil & Gas Operator | Jun 2014 |
| 225 | Maggard Joe | Mannford, OK 74044-9610 | Oil & Gas Operator | May 2023 |
| 226 | Maggard Oil Co Inc | Manford, OK 74044 | Oil & Gas Operator | Sep 1997 |
| 227 | Maggard Supply & Oil Company | Mannford, OK 74044-1407 | Oil & Gas Operator | Nov 2014 |
| 228 | Maggard VIrginia J | Mannford, OK 74044-3027 | Oil Operator | Jan 2025 |
| 229 | Maggert Energy Corp. | Spring, TX 77387 | Gas Operator | Jun 1998 |
| 230 | Magic Circle Energy | Oklahoma City, OK 73185 | Oil & Gas Operator | Dec 1983 |
| 231 | Magic City Oil & Gas | Amarillo, TX 79109 | Oil & Gas Operator | Apr 2025 |
| 232 | Magic Investments LLC | Edmond, OK 73013-1688 | Oil & Gas Operator | Jan 2025 |
| 233 | Magic Oil & Gas Inc. | Houston, TX 77079 | Oil & Gas Operator | Jan 2001 |
| 234 | Magma Resources LLC | Paoli, OK 73074 | Oil & Gas Operator | Jan 2025 |
| 235 | Magna Diversified Group, Inc. | Jacksonville, TX 75766 | Oil & Gas Operator | Oct 2013 |
| 236 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 237 | Magna Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 238 | Magnatex Corp | Midland, TX 79702-1311 | Oil & Gas Operator | Feb 1995 |
| 239 | Magnatex Petrole | | Oil Operator | Jun 1994 |
| 240 | Magnatex Petroleum | | Oil Operator | Apr 1993 |
| 241 | Magness Petroleum Company | | Oil & Gas Operator | Dec 1994 |
| 242 | Magnet Oil LP | Bronte, TX 76933 | Oil & Gas Operator | Apr 2025 |
| 243 | Magnolia Oil & Gas Operating LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 244 | Magnolia Petroleum Inc | Tulsa, OK 74106-2433 | Oil Operator | Jun 2018 |
| 245 | Magnolia Production Co | Atlanta, TX 75551 | Oil & Gas Operator | Apr 2025 |
| 246 | Magnolia Production Company LLC | | Oil & Gas Operator | Nov 2024 |
| 247 | Magnum DRLG Of Ohio, Inc | Ashland, KY 41102 | Oil & Gas Operator | Dec 2023 |
| 248 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Feb 2025 |
| 249 | Magnum Engineering Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 250 | Magnum Exploration Kansas, LLC | Lipan, TX 76462 | Oil Operator | Oct 2016 |
| 251 | Magnum Gas Pipeline, L.L.C. | | Oil Operator | Dec 2024 |
| 252 | Magnum Hunter Production, Inc. | Irving, TX 75014 | Oil & Gas Operator | Dec 2019 |
| 253 | Magnum Hunter Resources Corporation | | Oil & Gas Operator | Nov 2019 |
| 254 | Magnum Minerals, Inc. | | Oil & Gas Operator | May 1998 |
| 255 | Magnum Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Jul 2000 |
| 256 | Magnum Oil & Gas Inc. | Linn, WV 26384 | Gas Operator | Dec 2021 |
| 257 | Magnum Oil, LLC | Hartford, KY 42347 | Oil Operator | Dec 2023 |
| 258 | Magnum Oilfield Services LLC | Bakersfield, CA 93309 | Oil Operator | Apr 2025 |
| 259 | Magnum Operating, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 260 | Magnum Petroleum, Inc. | Palm Desert, CA 92260 | Oil & Gas Operator | Nov 2013 |
| 261 | Magnum Producing & Operating Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jan 2004 |
| 262 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 263 | Magnum Production & Well Service | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2025 |
| 264 | Magnusson Karl E | | Oil Operator | Apr 1987 |
| 265 | Magpie Operating, Inc | | Oil & Gas Operator | Jan 2025 |
| 266 | Magruder '81, LTD. | Midland, TX 79701 | Oil & Gas Operator | Jan 1995 |
| 267 | Magruder, Edwin H., Jr. | Midland, TX 79701 | Oil & Gas Operator | Oct 2019 |
| 268 | Maguire James Q Inc | Norman, OK 73070-1748 | Oil & Gas Operator | Jun 2011 |
| 269 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 270 | Maha Energy Us Inc | | Oil Operator | Nov 2023 |
| 271 | Mahan Jim And Janet | Collinsville, OK 74021 | Oil & Gas Operator | Jan 2025 |
| 272 | Mahfouz Energy Company | Houston, TX 77255 | Oil & Gas Operator | Nov 2020 |
| 273 | Mahl, Matthew J. | Springville, NY 14141 | Gas Operator | Dec 2023 |
| 274 | Mahler & Scott | Ruidoso, NM 88355 | Oil & Gas Operator | Aug 2003 |
| 275 | Mahler, Kelly Operating | Graham, TX 76450 | Oil & Gas Operator | Mar 2017 |
| 276 | Mahue Construction Company | Huntington, WV 25724-2345 | Oil & Gas Operator | Dec 2021 |
| 277 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2024 |
| 278 | Mai Operations | | Oil Operator | Dec 1996 |
| 279 | Maier Resources Inc | Oklahoma City, OK 73157-2996 | Oil & Gas Operator | Mar 2015 |
| 280 | Maier, H Paul | | Oil Operator | Dec 2023 |
| 281 | Main Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 2009 |
| 282 | Main Street Royalty, Inc. | Lockhart, TX 78644 | Oil & Gas Operator | Aug 1999 |
| 283 | Maines, Wendy R. | Irving, NY 14081 | Gas Operator | Dec 2023 |
| 284 | Mainspring LLC | Uhrichsville, OH 44683 | Oil & Gas Operator | Dec 2023 |
| 285 | Maintainer Energy Res Corp Inc | Morris, OK 74445-2663 | Oil Operator | Jan 2025 |
| 286 | Majestic Energy Company LLC | Keifer, OK 74041 | Oil Operator | Jan 2025 |
| 287 | Majestic Energy Corporation | Shreveport, LA 71164 | Oil & Gas Operator | May 2013 |
| 288 | Majestic Management Corp | | Oil Operator | Dec 2013 |
| 289 | Majestic Oil & Gas Holding Co. | Midland, TX 79705 | Oil Operator | Apr 2025 |
| 290 | Majestic Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | May 2007 |
| 291 | Majestic Petroleum Corporation | Dallas, TX 75230 | Oil & Gas Operator | Oct 1996 |
| 292 | Majestic Petroleum Operations Inc | Story, WY 82842 | Gas Operator | Mar 2007 |
| 293 | Majestic Resources, Inc. | Dripping SPGS, TX 78620 | Oil & Gas Operator | Nov 2007 |
| 294 | Majoil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 1996 |
| 295 | Major Oil Co LLC | Drumright, OK 74030 | Oil & Gas Operator | Apr 2020 |
| 296 | Major Oil Compan | | Oil Operator | Mar 1988 |
| 297 | Majors Eugene E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Jan 2025 |
| 298 | Majors Gary E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Dec 2024 |
| 299 | Majors Jimmy R | Osceola, NE 68651-0726 | Oil & Gas Operator | Sep 2000 |
| 300 | Majors John Dba Majors Production Co | Weleetka, OK 74880 | Oil & Gas Operator | Jan 2025 |