| 401 | Molz Oil Company | Kiowa, KS 67070 | Oil & Gas Operator | Feb 2024 |
| 402 | Monterey Production Company LLC | | Oil & Gas Operator | Feb 2024 |
| 403 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 404 | Mountain Front Pipeline Co, Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 405 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Feb 2024 |
| 406 | Muras Energy, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Jan 2024 |
| 407 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 408 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2024 |
| 409 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |
| 410 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 411 | Nadel And Gussman, L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | May 2024 |
| 412 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 413 | National Oil Company (Ohio) The | Columbus, OH 43215 | Oil & Gas Operator | Sep 1999 |
| 414 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2017 |
| 415 | Nelson Exploration Corporation | | Oil & Gas Operator | Jan 2024 |
| 416 | Nemaha Environmental Services LLC | Enid, OK 73703 | Oil Operator | Feb 2024 |
| 417 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2024 |
| 418 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | May 2024 |
| 419 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 420 | North Lake Resources LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | Jan 2024 |
| 421 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | May 2024 |
| 422 | Oilco Gas Co LC | Duncan, OK 73534 | Oil & Gas Operator | Dec 2014 |
| 423 | Oilsearch Corporation | Albuquerque, NM 87109 | Oil & Gas Operator | Feb 1994 |
| 424 | Oklahoma Liquid Resources Inc | Owasso, OK 74055-0841 | Oil & Gas Operator | Jan 2024 |
| 425 | Oklahoma Oil & Gas MGMT Inc | | Oil & Gas Operator | Jan 2024 |
| 426 | Oklahoma Oil Tactics Inc | Edmond, OK 73003-1351 | Oil & Gas Operator | Mar 2015 |
| 427 | Oklahoma Petroleum Allies LLC | Ardmore, OK 73401 | Oil Operator | Oct 2023 |
| 428 | Okland Oil Company | Oklahoma City, OK 73102-9022 | Oil & Gas Operator | Feb 2024 |
| 429 | Olympic Petroleum Company | Tulsa, OK 74114 | Oil & Gas Operator | Jun 1998 |
| 430 | Oneok Exploration Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 431 | Oneok Field Services Company | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2022 |
| 432 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 433 | Opal Operating Company LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2024 |
| 434 | Osborn Heirs Co | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2024 |
| 435 | Otc Petroleum Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Mar 2015 |
| 436 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jan 2024 |
| 437 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2024 |
| 438 | P O & G Operating LLC | Houston, TX 77057 | Oil & Gas Operator | May 2024 |
| 439 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 440 | Panadero Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Apr 2002 |
| 441 | Panenergy Services Inc | Houston, TX 77525 | Oil & Gas Operator | May 2001 |
| 442 | Panhandle Eastern Pipeline Company LP | Houston, TX 77002-6803 | Oil & Gas Operator | Oct 1999 |
| 443 | Panhandle Oil & Gas Consultants Inc | Woodward, OK 73802-5011 | Oil & Gas Operator | Jul 2015 |
| 444 | Panhandle Trading Company | Houston, TX 77251-1642 | Oil & Gas Operator | Jun 2003 |
| 445 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | May 2024 |
| 446 | Paramore Oil Company | Duncan, OK 73533 | Oil & Gas Operator | Apr 2022 |
| 447 | Paramount Petroleum Corp | Dallas, TX 75374 | Oil Operator | Dec 2000 |
| 448 | Pardee Production Co. | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2021 |
| 449 | Parker & Parsley Dev Co | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 450 | Parker & Parsley Dev LP | Irving, TX 75039-3745 | Oil & Gas Operator | Mar 2015 |
| 451 | Parwest Land Exploration, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Jan 2024 |
| 452 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 453 | Payne Exploration Company | Crescent, OK 73028-0502 | Oil & Gas Operator | Jan 2024 |
| 454 | Payne W C Family Trust | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Mar 2015 |
| 455 | PBT Enterprises Inc | Garber, OK 73738-0262 | Oil & Gas Operator | May 2023 |
| 456 | Pedestal Oil Company Inc | Oklahoma City, OK 73101-1522 | Oil & Gas Operator | May 2019 |
| 457 | Petra Petroleum Inc | Littleton, CO 80160-0319 | Oil & Gas Operator | Jun 2005 |
| 458 | Petro Energy Inc | Farmington, NM 87499 | Oil & Gas Operator | Jan 2024 |
| 459 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 460 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 461 | Petroleum Resources Co | Wichita, KS 67206 | Oil & Gas Operator | May 2000 |
| 462 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | May 2024 |
| 463 | Pharoah Bob | Maysville, OK 73057 | Oil & Gas Operator | Jul 1994 |
| 464 | Pices Energy Production Co. | Alva, OK 73717-9512 | Oil & Gas Operator | Apr 2014 |
| 465 | Plains Liquids Transport Inc | Houston, TX 77002 | Oil & Gas Operator | May 1996 |
| 466 | Plains Marketing & Trans Inc | Houston, TX 76002 | Oil & Gas Operator | Oct 1998 |
| 467 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 468 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 469 | Plenergy Dev LTD | | Oil & Gas Operator | Jun 2004 |
| 470 | Pollok Energy LLC | Tulsa, OK 74159 | Oil & Gas Operator | Feb 2024 |
| 471 | Post Petroleum Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Aug 2013 |
| 472 | Premier Resources LTD | Denver, CO 80237 | Oil & Gas Operator | Jul 2002 |
| 473 | Prentice Napier & Green Inc | Oklahoma City, OK 73172-1424 | Oil & Gas Operator | Feb 2024 |
| 474 | Presley Petroleum Company | Newport Beach, CA 92658-2200 | Oil & Gas Operator | Oct 1999 |
| 475 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | May 2024 |
| 476 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 477 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | May 2024 |
| 478 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jan 2024 |
| 479 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 480 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Jan 2024 |
| 481 | Providence Oil & Gas Corp | Tulsa, OK 74135-5463 | Oil & Gas Operator | May 2005 |
| 482 | Pyramid Oil Of America, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2024 |
| 483 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Jan 2024 |
| 484 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Jan 2024 |
| 485 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2024 |
| 486 | R E Blaik Inc | Edmond, OK 73013-6675 | Oil & Gas Operator | Feb 2024 |
| 487 | Radford Dale | Konawa, OK 74849-8828 | Oil & Gas Operator | Nov 2023 |
| 488 | Ram Asset Management Co | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 489 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 490 | Ramsey Property Management LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Jan 2024 |
| 491 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 492 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 493 | Ranken Energy Corporation | Edmond, OK 73013 | Oil & Gas Operator | Jan 2024 |
| 494 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | May 2024 |
| 495 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 496 | RDH Enterprises, Inc. | El Reno, OK 73036 | Oil & Gas Operator | May 2015 |
| 497 | Red Bluff Resources Operating LLC | | Oil & Gas Operator | Jan 2024 |
| 498 | Red Hawk Disposal LLC | | Oil Operator | Jun 2023 |
| 499 | Red Hawk Resources Inc | Edmond, OK 73003-3207 | Oil & Gas Operator | Feb 2024 |
| 500 | Red Rocks Oil & Gas Operating LLC | | Oil & Gas Operator | Feb 2024 |