| 301 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 302 | M & S Operating LLC | Oklahoma City, OK 73112 | Oil Operator | Mar 1999 |
| 303 | M J M D Inc | Burlington, IA 52601 | Oil Operator | Jan 2013 |
| 304 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Jan 2024 |
| 305 | M M Resources, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2018 |
| 306 | M-P Petroleum, Inc. | McPherson, KS 67460 | Oil & Gas Operator | Jan 2013 |
| 307 | Mac Laskey Kelly Oilfield | El Dorado, KS 67042 | Oil & Gas Operator | Feb 2024 |
| 308 | Mackey Consulting & Leasing LLC | Cleveland, OK 74020-0490 | Oil & Gas Operator | Jan 2024 |
| 309 | Maggard Oil Co Inc | Manford, OK 74044 | Oil & Gas Operator | Sep 1997 |
| 310 | Maggard Supply & Oil Company | Mannford, OK 74044-1407 | Oil & Gas Operator | Nov 2014 |
| 311 | Magma Resources LLC | Paoli, OK 73074-0237 | Oil & Gas Operator | Jan 2024 |
| 312 | Magnum Petroleum, Inc. | Palm Desert, CA 92260 | Oil & Gas Operator | Nov 2013 |
| 313 | Mallard Oil & Gas | Cody, WY 82414-9640 | Oil & Gas Operator | Oct 2019 |
| 314 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jan 2024 |
| 315 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Mar 2024 |
| 316 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Jan 2024 |
| 317 | Marjo Operating Mid-Continent LLC | | Oil & Gas Operator | Feb 2024 |
| 318 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 319 | Maverick Brothers Resources LLC | Enid, OK 73702-0392 | Oil & Gas Operator | Jan 2024 |
| 320 | Max Oil Company | | Oil & Gas Operator | Aug 2021 |
| 321 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Jan 2024 |
| 322 | Mayo Ross L Inc | Oklahoma City, OK 73120-1426 | Oil & Gas Operator | Jan 1997 |
| 323 | McAninch J W | Tonkawa, OK 74653 | Oil & Gas Operator | Nov 2000 |
| 324 | McAninch Michael E | Tonkawa, OK 74653-4415 | Oil & Gas Operator | May 2013 |
| 325 | McAninch W Kent | Tonkawa, OK 74653-4216 | Oil & Gas Operator | Oct 2016 |
| 326 | McCorgary Martin E | Arkansas City, KS 67005-5452 | Oil & Gas Operator | Jan 2024 |
| 327 | Meek Joe E | | Oil Operator | Jul 2010 |
| 328 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 329 | Mer Resources Inc | Edmond, OK 73013-7662 | Oil & Gas Operator | Mar 2015 |
| 330 | Mercer Oil & Gas Co. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 331 | Mervine Oil Company Inc | Blackwell, OK 74631-0514 | Oil Operator | Jan 2013 |
| 332 | Michael Goodnight Operating LLC | Saint Louis, OK 74866-0051 | Oil & Gas Operator | Jan 2024 |
| 333 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 334 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2024 |
| 335 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 336 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 337 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 338 | Midwest Enterprises, Inc. | Cashion, OK 73016-9626 | Oil & Gas Operator | Jan 2024 |
| 339 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 340 | Milmac Operating Company | Lubbock, TX 79408-2976 | Oil & Gas Operator | Sep 2004 |
| 341 | Mission Leasing LTD | Tulsa, OK 74136 | Oil Operator | Dec 2000 |
| 342 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 343 | Moran-K Oil LLC | Seminole, OK 74818-1295 | Oil & Gas Operator | Feb 2024 |
| 344 | Morris Pete Drilling Company | | Oil Operator | Feb 1999 |
| 345 | Morrison International Energy Inc | Oklahoma City, OK 73189-0537 | Oil & Gas Operator | Dec 2023 |
| 346 | MT Dora Energy LLC | Houston, OK 77056-1940 | Oil & Gas Operator | Jun 2019 |
| 347 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Feb 2024 |
| 348 | Muegge, Clay A. | Lamont, OK 74643 | Oil & Gas Operator | Feb 2024 |
| 349 | Musgrove Energy Inc | Ponca City, OK 74602 | Oil & Gas Operator | Dec 2023 |
| 350 | Musgrove, Casey Oil | Ponca City, OK 74602-0391 | Oil & Gas Operator | Jun 2017 |
| 351 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2024 |
| 352 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |
| 353 | Mystique Resources Company | Aurora, CO 80016 | Oil & Gas Operator | Feb 2023 |
| 354 | Nelson Exploration Corporation | | Oil & Gas Operator | Jan 2024 |
| 355 | Nemaha Environmental Services LLC | Enid, OK 73703 | Oil Operator | Feb 2024 |
| 356 | New Century Petroleum Corp | Oklahoma City, OK 73105 | Oil & Gas Operator | May 2013 |
| 357 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | May 2024 |
| 358 | Nexus Resources Corporation | Drumright, OK 74030 | Oil & Gas Operator | Jan 2013 |
| 359 | Nielson & Associates Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 360 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2024 |
| 361 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | May 2024 |
| 362 | Nogp Operating Company LLC | | Oil & Gas Operator | Jan 2024 |
| 363 | Nondorf Oil & Gas Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2008 |
| 364 | Nytex Energy LLC | Edmond, OK 73083-5946 | Oil & Gas Operator | Sep 2015 |
| 365 | Nytex, L.L.C. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2006 |
| 366 | Occidental Energy MKT Inc | Houston, TX 77001 | Oil & Gas Operator | Jan 2011 |
| 367 | Oex-1 LLC | Tulsa, OK 74105-5153 | Oil & Gas Operator | Dec 2023 |
| 368 | Oil Production Management Inc | Squaw Valley, CA 93675-9725 | Oil & Gas Operator | Dec 2002 |
| 369 | Oil Production Systems Inc | Cushing, OK 74023 | Oil & Gas Operator | Jan 2013 |
| 370 | Oil Ventures LTD | | Oil & Gas Operator | Jan 2013 |
| 371 | Oklahoma Liquid Resources Inc | Owasso, OK 74055-0841 | Oil & Gas Operator | Jan 2024 |
| 372 | Oklahoma Oil & Gas MGMT Inc | | Oil & Gas Operator | Jan 2024 |
| 373 | Oklahoma Petroleum Allies LLC | Ardmore, OK 73401 | Oil Operator | Oct 2023 |
| 374 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 375 | Orason Resources Inc | Tulsa, OK 74169-1225 | Oil & Gas Operator | Nov 2006 |
| 376 | Orion Exploration Partners LLC | | Oil & Gas Operator | Jul 2020 |
| 377 | P I C Inc | Ponca City, OK 74602 | Oil & Gas Operator | Jan 2013 |
| 378 | Pace Exploration LLC | Tulsa, OK 74170-1923 | Oil & Gas Operator | Dec 2023 |
| 379 | Palm Oil & Gas Company | Sedona, AZ 86340-4808 | Oil & Gas Operator | Feb 2024 |
| 380 | Pan Western Energy Corporation | Tulsa, OK 74114 | Oil & Gas Operator | May 2024 |
| 381 | Paradigm Twenty LLC | | Oil & Gas Operator | Jan 2024 |
| 382 | Paragon Production Company | Edmond, OK 73013-5051 | Oil & Gas Operator | Feb 2021 |
| 383 | Paramount Petroleum Corp | Dallas, TX 75374 | Oil Operator | Dec 2000 |
| 384 | Parker & Parsley Dev Co | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 385 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 386 | Patina Oklahoma Corp | Duncan, OK 73533-9523 | Oil & Gas Operator | Nov 2014 |
| 387 | PBT Enterprises Inc | Garber, OK 73738-0262 | Oil & Gas Operator | May 2023 |
| 388 | PCX Corporation | | Oil & Gas Operator | Feb 1994 |
| 389 | Peoples Bank & Trust Company | McPherson, KS 67460 | Oil Operator | Jan 2013 |
| 390 | Pepin Oil Co | Stillwater, OK 74076 | Oil & Gas Operator | Oct 2013 |
| 391 | Pepin Operating Company Inc | Stillwater, OK 74075-9535 | Oil & Gas Operator | May 2009 |
| 392 | Performance Petroleum Company LLC | Barnsdall, OK 74002-0628 | Oil & Gas Operator | Jan 2024 |
| 393 | Perkins Energy Company | Duncan, OK 73533-3853 | Oil & Gas Operator | Feb 2024 |
| 394 | Petro-Guard Company, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2014 |
| 395 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 396 | Petroleum Production MGMT., Inc. | Kansas City, MO 64112 | Oil & Gas Operator | May 2024 |
| 397 | Petron Energy Inc | Dallas, TX 75252 | Oil & Gas Operator | May 2024 |
| 398 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | May 2024 |
| 399 | Phillips Oil Operating Co | Enid, OK 73703-4921 | Oil & Gas Operator | May 2019 |
| 400 | Phillips Operating Co. | Mineral Wells, TX 76067 | Oil & Gas Operator | Jan 2013 |