| 301 | Mayo Ross L Inc | Oklahoma City, OK 73120-1426 | Oil & Gas Operator | Jan 1997 |
| 302 | McAninch J W | Tonkawa, OK 74653 | Oil & Gas Operator | Nov 2000 |
| 303 | McAninch Michael E | Tonkawa, OK 74653-4415 | Oil & Gas Operator | May 2013 |
| 304 | McAninch W Kent | Tonkawa, OK 74653-4216 | Oil & Gas Operator | Oct 2016 |
| 305 | McCorgary Martin E | Arkansas City, KS 67005-5452 | Oil & Gas Operator | Feb 2025 |
| 306 | Mer Resources Inc | Edmond, OK 73013-7662 | Oil & Gas Operator | Mar 2015 |
| 307 | Mercer Oil & Gas Co. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 308 | Mervine Oil Company Inc | Blackwell, OK 74631-0514 | Oil Operator | Jan 2013 |
| 309 | Michael Goodnight Operating LLC | St Louis, OK 74866 | Oil & Gas Operator | Apr 2025 |
| 310 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2025 |
| 311 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 312 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 313 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 314 | Midwest Enterprises, Inc. | Cashion, OK 73016-9626 | Oil & Gas Operator | Apr 2025 |
| 315 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 316 | Milmac Operating Company | Lubbock, TX 79408-2976 | Oil & Gas Operator | Sep 2004 |
| 317 | Mission Leasing LTD | Tulsa, OK 74136 | Oil Operator | Dec 2000 |
| 318 | MLT Energy, LLC | Derby, KS 67037 | Oil Operator | Apr 2025 |
| 319 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | May 2025 |
| 320 | Morris Pete Drilling Company | | Oil Operator | Feb 1999 |
| 321 | Morrison International Energy Inc | Oklahoma City, OK 73189-0537 | Oil & Gas Operator | Feb 2025 |
| 322 | MT Dora Energy LLC | Houston, OK 77056-1940 | Oil & Gas Operator | Jun 2019 |
| 323 | Muegge, Clay A. | Lamont, OK 74643 | Oil & Gas Operator | May 2025 |
| 324 | Musgrove Energy Inc | Ponca City, OK 74602 | Oil & Gas Operator | Feb 2025 |
| 325 | Musgrove, Casey Oil | Ponca City, OK 74602-0391 | Oil & Gas Operator | Jun 2017 |
| 326 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2025 |
| 327 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |
| 328 | Mystique Resources Company | Aurora, CO 80016 | Oil & Gas Operator | Feb 2023 |
| 329 | New Century Petroleum Corp | Oklahoma City, OK 73105 | Oil & Gas Operator | May 2013 |
| 330 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 331 | Nexus Resources Corporation | Drumright, OK 74030 | Oil & Gas Operator | Jan 2013 |
| 332 | Nielson & Associates Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 333 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 334 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | Jul 2025 |
| 335 | Nogp Operating Company Inc | Frisco, TX 75033 | Oil & Gas Operator | Apr 2025 |
| 336 | Nondorf Oil & Gas Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2008 |
| 337 | Nytex Energy LLC | Edmond, OK 73083-5946 | Oil & Gas Operator | Sep 2015 |
| 338 | Nytex, L.L.C. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2006 |
| 339 | Oex-1 LLC | Tulsa, OK 74105-5153 | Oil & Gas Operator | Mar 2024 |
| 340 | Oil Production Management Inc | Squaw Valley, CA 93675-9725 | Oil & Gas Operator | Dec 2002 |
| 341 | Oil Production Systems Inc | Cushing, OK 74023 | Oil & Gas Operator | Jan 2013 |
| 342 | Oil Ventures LTD | | Oil & Gas Operator | Jan 2013 |
| 343 | Oklahoma Oil & Gas MGMT Inc | Edmond, OK 73083-6786 | Oil & Gas Operator | Apr 2025 |
| 344 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 345 | Orason Resources Inc | Tulsa, OK 74169-1225 | Oil & Gas Operator | Nov 2006 |
| 346 | Orion Exploration Partners LLC | Tulsa, OK 74105-5153 | Oil & Gas Operator | Apr 2025 |
| 347 | P I C Inc | Ponca City, OK 74602 | Oil & Gas Operator | Jan 2013 |
| 348 | Pace Exploration LLC | Tulsa, OK 74133 | Oil & Gas Operator | Apr 2025 |
| 349 | Palm Oil & Gas Company | Sedona, AZ 86340 | Oil & Gas Operator | May 2025 |
| 350 | Pan Western Energy Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Jul 2025 |
| 351 | Paradigm Twenty LLC | Stillwater, OK 74074-1745 | Oil & Gas Operator | Apr 2025 |
| 352 | Paragon Production Company | Edmond, OK 73013-5051 | Oil & Gas Operator | Feb 2021 |
| 353 | Parker & Parsley Dev Co | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 354 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 355 | Patina Oklahoma Corp | Duncan, OK 73533-9523 | Oil & Gas Operator | Nov 2014 |
| 356 | Payne Exploration Company | Crescent, OK 73028 | Oil & Gas Operator | Apr 2025 |
| 357 | Peak Operating Oil & Gas LLC | Wichita, KS 67226-3375 | Oil & Gas Operator | Apr 2025 |
| 358 | Peoples Bank & Trust Company | McPherson, KS 67460 | Oil Operator | Jan 2013 |
| 359 | Pepin Oil Co | Stillwater, OK 74076 | Oil & Gas Operator | Oct 2013 |
| 360 | Pepin Operating Company Inc | Stillwater, OK 74075-9535 | Oil & Gas Operator | May 2009 |
| 361 | Performance Petroleum Company LLC | Barnsdall, OK 74002 | Oil & Gas Operator | Apr 2025 |
| 362 | Perkins Energy Company | Duncan, OK 73533-3853 | Oil & Gas Operator | May 2025 |
| 363 | Petro-Guard Company, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2014 |
| 364 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 365 | Petroleum Production MGMT., Inc. | Kansas City, MO 64112 | Oil & Gas Operator | Jul 2025 |
| 366 | Petron Energy Inc | Dallas, TX 75252 | Oil & Gas Operator | Jul 2025 |
| 367 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Jul 2025 |
| 368 | Phillips Oil Operating Co | Enid, OK 73703-4921 | Oil & Gas Operator | May 2019 |
| 369 | Phillips Operating Co. | Mineral Wells, TX 76067 | Oil & Gas Operator | Jan 2013 |
| 370 | Pierce G R Oil Properties Inc | Oklahoma City, OK 73106 | Oil Operator | Feb 1999 |
| 371 | Pinnacle Corporation (The) | Broken Arrow, OK 74012 | Oil & Gas Operator | Nov 2014 |
| 372 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | May 2025 |
| 373 | Polaris Petroleum Operations LLC | Branson West, MO 65737 | Oil & Gas Operator | May 2019 |
| 374 | Prairie Exploration Company | Norman, OK 73072 | Oil & Gas Operator | Mar 2011 |
| 375 | Prairie Wind Oil LLC | Blackwell, OK 74647-7242 | Oil & Gas Operator | Apr 2025 |
| 376 | Pressure Pumping Services LLC | Blackwell, OK 74631-2466 | Oil & Gas Operator | Apr 2025 |
| 377 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 378 | Producers Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |
| 379 | Pryor, VIctor W., Jr. | Holdenville, OK 74848 | Oil & Gas Operator | Apr 2017 |
| 380 | Pullers Oil Company LLC | Blackwell, OK 74631-9512 | Oil & Gas Operator | May 2025 |
| 381 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 382 | Quail Oil & Gas LC | Garden City, KS 67846 | Oil & Gas Operator | May 2025 |
| 383 | R & S Oil Company | Tonkawa, OK 74653 | Oil & Gas Operator | Nov 2013 |
| 384 | R C Holdings LLC | Garber, OK 73738-5423 | Oil & Gas Operator | Apr 2017 |
| 385 | Ra-Jac LLC | Norman, OK 73072 | Oil & Gas Operator | May 2025 |
| 386 | Rahmco Oil And Gas Co Inc | Ponca City, OK 74604-5155 | Oil & Gas Operator | Jan 2013 |
| 387 | Ram Oil & Gas | Blackwell, OK 74631 | Oil & Gas Operator | May 2013 |
| 388 | Rama Operating Co., Inc. | Stafford, KS 67578 | Oil & Gas Operator | Apr 2025 |
| 389 | Ramsey Nichols Operating Company LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | May 2025 |
| 390 | Ramsey Property Management LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Apr 2025 |
| 391 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 392 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 393 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 394 | Red Eagle Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2005 |
| 395 | Red Fork (USA) Investments Inc | Midland, TX 79710-0272 | Oil & Gas Operator | May 2019 |
| 396 | Rence Guy A | | Oil Operator | Jan 2013 |
| 397 | Reno Resources Inc | Boynton, OK 74422-9762 | Oil & Gas Operator | May 2015 |
| 398 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 399 | Rhoads Mark Operations | Ponca City, OK 74604 | Oil & Gas Operator | May 2006 |
| 400 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jul 2025 |