| 301 | Midwest Pipe & Supply Company | Oklahoma City, OK 73154-0245 | Oil & Gas Operator | Dec 2008 |
| 302 | Midwestern Exploration Company | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 303 | Migwis Operating LLC | Cushing, OK 74023-4854 | Oil & Gas Operator | Oct 2020 |
| 304 | Mija LLC | Oklahoma City, OK 73151 | Oil & Gas Operator | Nov 2025 |
| 305 | Mikal R Brown Oil LLC | Cleveland, OK 74020-6475 | Oil Operator | Dec 2022 |
| 306 | Mikarden Energy Inc | Sapulpa, OK 74066 | Oil Operator | Oct 2025 |
| 307 | Mikco Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2001 |
| 308 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 309 | Milburn R Kenneth | Ardmore, OK 73402-1118 | Oil & Gas Operator | Sep 2014 |
| 310 | Milburn Robert G | Countyline, OK 73025 | Oil Operator | Apr 2020 |
| 311 | Mild Oil Company | Duncan, OK 73533-9532 | Oil Operator | Mar 2000 |
| 312 | Miller & Stanley Oper Co | Amarillo, TX 79114 | Oil & Gas Operator | Sep 2014 |
| 313 | Miller B Investments | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2007 |
| 314 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 315 | Miller Joe B | Lawton, OK 73507 | Oil Operator | Sep 2025 |
| 316 | Miller John Production | Bristow, OK 74010-2455 | Oil & Gas Operator | Jul 2016 |
| 317 | Miller Oil & Gas Co | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2017 |
| 318 | Miller Petroleum Company | Yukon, OK 73099-0452 | Oil & Gas Operator | Aug 2009 |
| 319 | Miller William D | Sapulpa, OK 74066-1061 | Oil Operator | Oct 2010 |
| 320 | Miller, James R | Herrington, KS 67449 | Oil Operator | Oct 2025 |
| 321 | Miller-McGee Operating Inc | Stroud, OK 74079 | Oil & Gas Operator | Nov 2025 |
| 322 | Milmac Operating Company | Lubbock, TX 79408-2976 | Oil & Gas Operator | Sep 2004 |
| 323 | Milne Lewis Joel | Allen, OK 74825 | Oil & Gas Operator | Mar 2015 |
| 324 | Min-Tex Oil Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Dec 1996 |
| 325 | Miner Rick Oil Inc | Drumright, OK 74030-0373 | Oil & Gas Operator | Apr 2022 |
| 326 | Minerva Oil Company | Tulsa, OK 74152-0858 | Oil & Gas Operator | Mar 2015 |
| 327 | Minihan Oil And Gas Company | Seminole, OK 74868-9790 | Oil & Gas Operator | Sep 2014 |
| 328 | Minihan Production Co | Seminole, OK 74868 | Oil & Gas Operator | Jan 1997 |
| 329 | Mink Oil Company | | Oil Operator | Nov 2003 |
| 330 | Mink Richard | Cement, OK 73017 | Oil & Gas Operator | Oct 2025 |
| 331 | Minor Jr W T | Wichita Falls, TX 76307 | Oil Operator | Nov 1998 |
| 332 | Minor Mark | FT Worth, TX 76116-1003 | Oil Operator | Nov 2015 |
| 333 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |
| 334 | Miracle Production Inc | Yukon, OK 73085-0680 | Oil & Gas Operator | Jun 2007 |
| 335 | Mission Leasing LTD | Tulsa, OK 74136 | Oil Operator | Dec 2000 |
| 336 | Mission Oil & Gas | Pawhuska, OK 74056 | Oil Operator | May 2013 |
| 337 | Mitchell Cecil D | Haskell, OK 74436-7667 | Oil & Gas Operator | Apr 2020 |
| 338 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 339 | Mitchell Martha | Henryetta, OK 74437-0488 | Oil & Gas Operator | Apr 2011 |
| 340 | Miti-Mini Inc | Wetumka, OK 74883-6172 | Gas Operator | Jul 2016 |
| 341 | Mito Resources LLC | Edmond, OK 73013 | Oil & Gas Operator | Nov 2025 |
| 342 | Miura Petroleum Inc | Topeka, KS 66603 | Oil & Gas Operator | May 2006 |
| 343 | MJ Goetz Bonding, LLC | Bartlesville, OK 74006 | Oil Operator | Oct 2025 |
| 344 | MJB Production Company, Inc. | Brownfield, TX 79316 | Oil & Gas Operator | Dec 2025 |
| 345 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 346 | MJM Resources Inc | Norman, OK 73072 | Oil & Gas Operator | Nov 2025 |
| 347 | MLC Resources LLC | Kingfisher, OK 73750-0364 | Oil & Gas Operator | Oct 2025 |
| 348 | MLT Energy, LLC | Derby, KS 67037 | Oil Operator | Oct 2025 |
| 349 | Moabb Oil Corp | | Oil & Gas Operator | Apr 1998 |
| 350 | Mobil Exp & Prod Us Inc | Houston, TX 77060-1991 | Oil & Gas Operator | May 2001 |
| 351 | Mode Oil & Gasdev LTD12/21/Ofb 9-98 | | Oil & Gas Operator | May 2013 |
| 352 | Moffitt W G Trust | Fort Gibson, OK 74434-4258 | Gas Operator | Nov 2019 |
| 353 | Mogo Operating, LLC | Norman, OK 73069 | Oil & Gas Operator | Nov 2025 |
| 354 | Mogul Energy Corp | Los Angeles, CA 90024 | Oil & Gas Operator | Jan 2001 |
| 355 | Mohawk Operating LLC | Oklahoma City, OK 73173-8907 | Gas Operator | Feb 2004 |
| 356 | Mollenkopf Mark | Anadarko, OK 73005 | Oil Operator | Jul 2025 |
| 357 | Molz Oil Company Inc | Kiowa, KS 67070 | Oil & Gas Operator | Nov 2025 |
| 358 | Moms Oil & Gas LLC | Nowata, OK 74048 | Oil & Gas Operator | Mar 2023 |
| 359 | Monarch Energy Company LLC | Eufaula, OK 74432 | Oil & Gas Operator | Oct 2025 |
| 360 | Monarch Petroleum Corporation | FT Worth, TX 76102 | Oil & Gas Operator | Dec 2019 |
| 361 | Moncrief R W Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1994 |
| 362 | Monexco | Edmond, OK 73034-3776 | Oil & Gas Operator | Mar 2008 |
| 363 | Monexco LLC | Dallas, TX 75204-2634 | Oil & Gas Operator | Oct 2025 |
| 364 | Monexco Operating Company | Dallas, TX 75204-2634 | Oil & Gas Operator | Oct 2025 |
| 365 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | Oct 2025 |
| 366 | Montclair Energy LLC | Edmond, OK 73034-7291 | Oil & Gas Operator | Nov 2025 |
| 367 | Montego Resources Inc | Oklahoma City, OK 73172-0192 | Oil & Gas Operator | Mar 2015 |
| 368 | Monterey Production Company LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 369 | Montex Exploration Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2011 |
| 370 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Nov 2025 |
| 371 | Montgomery Jake E | Henryetta, OK 74437 | Oil & Gas Operator | Sep 2025 |
| 372 | Montgomery Oil & Gas Expl Inc | Tulsa, OK 74170-1884 | Oil & Gas Operator | Mar 2005 |
| 373 | Monty L Hott Production Corporation | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 374 | Moore & Moore Energy Inc | Purcell, OK 73080-0674 | Oil & Gas Operator | Dec 2012 |
| 375 | Moore Clay | Bradenton, FL 34211 | Oil & Gas Operator | Oct 2025 |
| 376 | Moore David K | Duncan, OK 73575 | Oil & Gas Operator | Oct 2009 |
| 377 | Moore Don | Elmore City, OK 73433 | Oil & Gas Operator | Oct 2025 |
| 378 | Moore Investments LC | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Feb 2023 |
| 379 | Moore Lynn D | Collinsville, OK 74021 | Oil Operator | Aug 2013 |
| 380 | Moore Oil And Gas | Burleson, TX 76028 | Oil & Gas Operator | Dec 2025 |
| 381 | Moore Petroleum Invest Corp | Norman, OK 73072-4217 | Oil & Gas Operator | Oct 2025 |
| 382 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 383 | Moore Robert L | Perryton, TX 79070-1275 | Oil & Gas Operator | Apr 2020 |
| 384 | Moore Tommy M | Sapulpa, OK 74066-8273 | Oil & Gas Operator | May 2013 |
| 385 | Moore W T | Sapulpa, OK 74067-0946 | Oil & Gas Operator | Jan 2021 |
| 386 | Moran Oil Enterprises LLC | Seminole, OK 74818 | Oil & Gas Operator | Dec 2019 |
| 387 | Moran Pipe & Supply Co Inc | Seminole, OK 74868 | Oil & Gas Operator | Jan 2019 |
| 388 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Nov 2025 |
| 389 | Moran-Kahn Oil | Seminole, OK 74868 | Oil & Gas Operator | Mar 1992 |
| 390 | Morgan David E | Enid, OK 73702-3525 | Oil & Gas Operator | Sep 2016 |
| 391 | Morgan Energy Corporation | Englewood, CO 80110 | Oil & Gas Operator | Mar 2006 |
| 392 | Morgan Oil Company | Nacogdoches, TX 75963 | Oil & Gas Operator | May 2006 |
| 393 | Morgan Petroleum Company | Edmond, OK 73083 | Oil & Gas Operator | Mar 1993 |
| 394 | Morgan Robert M / L Ladean | Wewoka, OK 74884 | Oil & Gas Operator | Jul 2015 |
| 395 | Morris & Associates | Purcell, OK 73080 | Oil Operator | Feb 2012 |
| 396 | Morris Dennis J | Cameron, OK 74932-2186 | Gas Operator | Oct 2025 |
| 397 | Morris Ed Dba Morris Operating Company | Mounds, OK 74047-4801 | Oil & Gas Operator | Oct 2025 |
| 398 | Morris Pete Drilling Company | | Oil Operator | Feb 1999 |
| 399 | Morris Roger Dan | Cushing, OK 74023 | Oil & Gas Operator | Sep 2025 |
| 400 | Morrison International Energy Inc | Oklahoma City, OK 73189-0537 | Oil & Gas Operator | Feb 2025 |