| 401 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | Dec 2023 |
| 402 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2023 |
| 403 | Marmac Resources Inc | | Oil Operator | Nov 1998 |
| 404 | Marsh Oil & Gas Company | Pauls Valley, OK 73075-0726 | Oil & Gas Operator | Jan 2024 |
| 405 | Martin Jim & Julie | Wynona, OK 74084 | Oil & Gas Operator | Jan 2024 |
| 406 | Martin Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Jan 2024 |
| 407 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 408 | Matna Enterprises LLC | | Oil & Gas Operator | Dec 2023 |
| 409 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Dec 2023 |
| 410 | McClintock, Robert T | | Oil & Gas Operator | Nov 2023 |
| 411 | McO Resources Integrated Corp | Houston, TX 77057 | Oil Operator | Jan 1997 |
| 412 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 413 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Jan 2024 |
| 414 | Medina-Pierce Oil & Gas Co | | Oil & Gas Operator | Feb 2012 |
| 415 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 416 | Mep Operating LLC | | Oil & Gas Operator | Dec 2023 |
| 417 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 418 | Mesa Exploration Company Inc | Dallas, TX 75206-0500 | Oil & Gas Operator | Jan 2024 |
| 419 | Michael Goodnight Operating LLC | Saint Louis, OK 74866-0051 | Oil & Gas Operator | Dec 2023 |
| 420 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 421 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 422 | Midwest Pipe & Supply Company | Oklahoma City, OK 73154-0245 | Oil & Gas Operator | Dec 2008 |
| 423 | Minihan Oil And Gas Company | Seminole, OK 74868-9790 | Oil & Gas Operator | Sep 2014 |
| 424 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |
| 425 | Miracle Production Inc | Yukon, OK 73085-0680 | Oil & Gas Operator | Jun 2007 |
| 426 | Mito Resources LLC | Edmond, OK 73013 | Oil & Gas Operator | Jan 2024 |
| 427 | Montclair Energy LLC | | Oil & Gas Operator | Dec 2023 |
| 428 | Moore Investments LC | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Feb 2023 |
| 429 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 430 | Moran Oil Enterprises, LLC | Seminole, OK 74818 | Oil & Gas Operator | Dec 2023 |
| 431 | Moran-K Oil LLC | Seminole, OK 74818-1295 | Oil & Gas Operator | Jan 2024 |
| 432 | Moran-Kahn Oil | Seminole, OK 74868 | Oil & Gas Operator | Mar 1992 |
| 433 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Jan 2024 |
| 434 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 435 | Nadel And Gussman, L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2024 |
| 436 | Nail Stephen Dba Nail Oil & Gas | Maud, OK 74854-0237 | Oil Operator | Dec 2023 |
| 437 | Nelson Exploration Corporation | | Oil & Gas Operator | Dec 2023 |
| 438 | Nemaha Environmental Services LLC | Enid, OK 73703 | Oil Operator | Dec 2023 |
| 439 | New Dominion LLC | Tulsa, OK 74119-3220 | Oil & Gas Operator | Dec 2023 |
| 440 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 441 | Newell Oil And Gas LLC | Shawnee, OK 74801-5783 | Oil & Gas Operator | Jan 2024 |
| 442 | NGL Crude Logistics LLC | Denver, CO 80220 | Oil Operator | Dec 2023 |
| 443 | Nitro Petroleum Inc | Phoenix, AZ 85016-4599 | Oil & Gas Operator | May 2020 |
| 444 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 445 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Apr 2024 |
| 446 | Oak Hills Drilling & Oper., LLC | Holdenville, OK 74848 | Oil & Gas Operator | May 2013 |
| 447 | Oak Hills Energy Inc | Holdenville, OK 74848-0470 | Oil & Gas Operator | Sep 2014 |
| 448 | Oakland Petroleum Oper Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 449 | Oasis Energy Resources LLC | | Oil & Gas Operator | Dec 2023 |
| 450 | Octagon Resources LLC | Norman, OK 73071-1295 | Oil & Gas Operator | May 2015 |
| 451 | Odessa Oil Investment Co., Inc. | Odessa, TX 79762 | Oil & Gas Operator | Nov 2016 |
| 452 | Oil Center Operating Inc | Fort Worth, TX 76102-5108 | Oil & Gas Operator | Apr 2014 |
| 453 | Oil Production Systems Inc | Cushing, OK 74023 | Oil & Gas Operator | Jan 2013 |
| 454 | Okla Sub-Surface Pump & Supply Co | Seminole, OK 74818-2248 | Oil & Gas Operator | Jan 2024 |
| 455 | Oklahoma Basic Economy Corp | Houston, TX 77002-6003 | Oil & Gas Operator | Apr 2020 |
| 456 | Oklahoma Equipment & Salvage | Oklahoma City, OK 73120-5903 | Oil & Gas Operator | Mar 2015 |
| 457 | Oklahoma Liquid Resources Inc | Owasso, OK 74055-0841 | Oil & Gas Operator | Dec 2023 |
| 458 | Oklahoma Oil & Gas MGMT Inc | | Oil & Gas Operator | Dec 2023 |
| 459 | Oklahoma Petroleum Allies LLC | Ardmore, OK 73401 | Oil Operator | Oct 2023 |
| 460 | Okland Oil Company | Oklahoma City, OK 73102-9022 | Oil & Gas Operator | Jan 2024 |
| 461 | Onshore Royalties LLC | Houston, TX 77269 | Oil & Gas Operator | Feb 2024 |
| 462 | Orca Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2024 |
| 463 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jan 2024 |
| 464 | Pace Exploration LLC | Tulsa, OK 74170-1923 | Oil & Gas Operator | Dec 2023 |
| 465 | Pace Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | Apr 2024 |
| 466 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 467 | Paleo, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Apr 2024 |
| 468 | Palm Operating LLC | Oklahoma City, OK 73106-5646 | Oil & Gas Operator | Nov 2019 |
| 469 | Paluca Petroleum Inc | Holdenville, OK 74848 | Oil & Gas Operator | Jan 2024 |
| 470 | Paramount Petroleum Corp | Dallas, TX 75374 | Oil Operator | Dec 2000 |
| 471 | Parkinsol Oil Company | Seminole, OK 74868-1648 | Oil & Gas Operator | Oct 2014 |
| 472 | Parsons Engineering Corporation | Tulsa, OK 74137-7505 | Oil & Gas Operator | Oct 2017 |
| 473 | Patco Investments Inc | Seminole, OK 74868 | Oil Operator | Nov 2007 |
| 474 | Patterson Russell B | Wewoka, OK 74884-1262 | Oil & Gas Operator | Feb 2020 |
| 475 | Paul Gillham Oil Company | Maud, OK 74854-0699 | Oil & Gas Operator | Jan 2024 |
| 476 | PBT Enterprises Inc | Garber, OK 73738-0262 | Oil & Gas Operator | May 2023 |
| 477 | PCL Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 478 | Pelican Production Company | New Orleans, LA 70130-2477 | Oil & Gas Operator | Mar 2014 |
| 479 | Pennant Energy LLC | | Oil Operator | Oct 2023 |
| 480 | Pennant Oil & Gas LLC | | Oil & Gas Operator | Dec 2023 |
| 481 | Pennmark Resources Company | Edmond, OK 73013 | Oil & Gas Operator | Dec 2023 |
| 482 | Petro Davis Inc | Oklahoma City, OK 73142-1807 | Oil & Gas Operator | Jan 2013 |
| 483 | Petro Speed Inc | Norman, OK 73069-8116 | Oil & Gas Operator | Mar 2015 |
| 484 | Petro-Management Assoc., Inc. | Edmond, OK 73083-2346 | Oil & Gas Operator | Jun 2007 |
| 485 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 486 | Petroleum Resources Co | Wichita, KS 67206 | Oil & Gas Operator | May 2000 |
| 487 | Pheldon Oil Production Inc | Asher, OK 74826-2629 | Oil & Gas Operator | Dec 2023 |
| 488 | Phoenix Oil & Gas Inc | Seminole, OK 74818-1859 | Oil & Gas Operator | Jan 2024 |
| 489 | Pinnacle Corporation (The) | Tulsa, OK 74137-1437 | Oil & Gas Operator | Nov 2014 |
| 490 | Plains Liquids Transport Inc | Houston, TX 77002 | Oil & Gas Operator | May 1996 |
| 491 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 492 | Pogue Randall | Ada, OK 74821-1547 | Oil & Gas Operator | Apr 2014 |
| 493 | Positive Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 494 | Postrock Midcontinent Production LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Dec 2023 |
| 495 | PRDJ Cockrum Enterprises Inc | Okemah, OK 74859-5126 | Oil & Gas Operator | Mar 2022 |
| 496 | Presley Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2024 |
| 497 | Presley Petroleum Company | Newport Beach, CA 92658-2200 | Oil & Gas Operator | Oct 1999 |
| 498 | Prime Energy Corp | Charleston, WV 25301-1707-1707 | Oil & Gas Operator | Sep 2015 |
| 499 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 500 | Princess Three Operating, LLC | Henderson, TX 75653 | Oil & Gas Operator | Apr 2024 |