| 501 | Pierce O M Operations | Duncan, OK 73533 | Oil & Gas Operator | Nov 1998 |
| 502 | Pierce Patsey R The Estate Of | Duncan, OK 73533-4900 | Oil Operator | Mar 2007 |
| 503 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 504 | Pletcher Oil Limited Liability Company | Ardmore, OK 73401 | Oil & Gas Operator | May 2026 |
| 505 | Pogue Randall | Ada, OK 74821-1547 | Oil & Gas Operator | Apr 2014 |
| 506 | Positive Energy LLC | Ada, OK 74820 | Oil & Gas Operator | May 2026 |
| 507 | Potts Exploration LLC | Oklahoma City, OK 73114 | Gas Operator | Jan 2016 |
| 508 | Pound Robert M | Bristow, OK 74010 | Oil & Gas Operator | Sep 2014 |
| 509 | Powell Oil | Healdton, OK 73438-4463 | Oil & Gas Operator | Apr 2026 |
| 510 | Presidio Petroleum LLC | Canadian, TX 79014 | Oil & Gas Operator | Jul 2026 |
| 511 | Preston Carter Oil Company | Davis, OK 73030 | Oil & Gas Operator | Apr 2026 |
| 512 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2026 |
| 513 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 514 | Prime Energy Corp | Charleston, WV 25301-1707 | Oil & Gas Operator | Sep 2015 |
| 515 | Producers Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |
| 516 | Prompt Operating LLC | Velma, OK 73491 | Oil Operator | Apr 2026 |
| 517 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Apr 2026 |
| 518 | Pruitt Operating Company LLC | Ratliff City, OK 73481-5802 | Oil & Gas Operator | May 2026 |
| 519 | Psa Inc | Chandler, OK 74834-4222 | Oil & Gas Operator | Apr 2026 |
| 520 | Psec Inc | Tulsa, OK 74102-0871 | Oil & Gas Operator | Dec 2016 |
| 521 | PV Oil & Gas LLC | Ratliff City, OK 73481 | Oil Operator | Apr 2026 |
| 522 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 523 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 524 | R & C Oil And Gas Inc | Ada, OK 74820-3150 | Oil Operator | Jul 2016 |
| 525 | R & H LLC | Ardmore, OK 73401-6329 | Oil & Gas Operator | Mar 2015 |
| 526 | Ra-Jac LLC | Norman, OK 73069 | Oil & Gas Operator | May 2026 |
| 527 | Rafter H Operating LLC | El Reno, OK 73036 | Oil & Gas Operator | Apr 2026 |
| 528 | Raizen Oil Company | Velma, OK 73091 | Oil & Gas Operator | Feb 2016 |
| 529 | Raizen Oil LLC | Duncan, OK 73533-4657 | Oil & Gas Operator | Nov 2003 |
| 530 | Ram Asset Management Co | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 531 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 532 | Ramsey George H Estate | Ardmore, OK 73401-3644 | Oil & Gas Operator | Nov 2013 |
| 533 | Ramsey Property Management LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2026 |
| 534 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 535 | Ratliff City Trucking Inc | Ratliff City, OK 73481-9603 | Oil & Gas Operator | Feb 2018 |
| 536 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 537 | Reading & Bates Petroleum Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 538 | Redbud Oil Company | Elmore City, OK 73433-8637 | Oil Operator | Apr 2026 |
| 539 | Redland Resources LLC | Oklahoma City, OK 73127 | Oil & Gas Operator | May 2026 |
| 540 | Reid Williams Operating Inc | Shreveport, LA 71106-6223 | Oil & Gas Operator | Apr 2026 |
| 541 | Renfroe Lyndol | Wilson, OK 73463-6631 | Oil Operator | May 2020 |
| 542 | Reo Resources Inc | | Oil & Gas Operator | Apr 2018 |
| 543 | Research Oil Company Inc | Norman, OK 73070-8776 | Oil & Gas Operator | Aug 2019 |
| 544 | Ricks Expl Acquisition Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2004 |
| 545 | Ricks Expl Acquisition LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2013 |
| 546 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 547 | Rimrock Resource Operating LLC | Tulsa, OK 74103-4462 | Oil & Gas Operator | Apr 2026 |
| 548 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 549 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2026 |
| 550 | RJ Williams Oil & Gas LLC | Ardmore, OK 73401 | Oil & Gas Operator | May 2026 |
| 551 | Roan Resources LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Apr 2024 |
| 552 | Rocket Oil Company | Duncan, OK 73534 | Oil & Gas Operator | Apr 2015 |
| 553 | Rockland Oil Company | Addison, TX 75001 | Oil & Gas Operator | Apr 2026 |
| 554 | Romax Corporation | Ardmore, OK 73401-8882 | Oil & Gas Operator | Feb 2022 |
| 555 | Roring Jr Roy W | Duncan, OK 73533-3048 | Oil & Gas Operator | Aug 2022 |
| 556 | Roring Roy W | Ardmore, OK 73401 | Oil & Gas Operator | Dec 1998 |
| 557 | Roring Steven A | Ratliff City, OK 73481-0206 | Oil Operator | Feb 2018 |
| 558 | Rose Operating Company | Tulsa, OK 74101-2391 | Oil & Gas Operator | Dec 2014 |
| 559 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Jul 2026 |
| 560 | Roundup Oil LLC | Springer, OK 73458 | Oil & Gas Operator | May 2026 |
| 561 | Rue Johnny B | Duncan, OK 73533-2019 | Oil & Gas Operator | Oct 2025 |
| 562 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Apr 2026 |
| 563 | Russell, John R | | Oil Operator | Mar 2025 |
| 564 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 565 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2026 |
| 566 | Sajac Energy Company LLC | Duncan, OK 73533 | Oil & Gas Operator | May 2026 |
| 567 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 568 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 569 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 570 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jul 2026 |
| 571 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jul 2026 |
| 572 | Sanook Inc | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Jan 2007 |
| 573 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 574 | Sarkeys Inc | | Oil & Gas Operator | Dec 1998 |
| 575 | Scissortail Exploration & Production, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2026 |
| 576 | Scout Energy Corporation | Edmond, OK 73083-1348 | Oil & Gas Operator | Apr 2026 |
| 577 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2026 |
| 578 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 579 | Seals And Brown Oil Operating | Norman, OK 73072-3020 | Oil & Gas Operator | Sep 2024 |
| 580 | Seals Oil Company | Fox, OK 73435-0222 | Oil & Gas Operator | Nov 2011 |
| 581 | Sean M Sharp LLC | Chalk Hill, PA 15421 | Oil & Gas Operator | Oct 2025 |
| 582 | Shadowpeak Operating LLC | Oklahoma City, OK 73159-6905 | Oil & Gas Operator | Apr 2026 |
| 583 | Shanks Drilling & Production Company LLC | Bixby, OK 74008 | Oil & Gas Operator | May 2026 |
| 584 | Shell Western Expl & Prod Inc | Houston, TX 77251 | Oil & Gas Operator | Mar 2015 |
| 585 | Sikes Oil Company Inc | Velma, OK 73091-0759 | Oil & Gas Operator | Jan 2014 |
| 586 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Jul 2026 |
| 587 | Simmons, L.B. Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 2000 |
| 588 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 589 | Slawson Clifford Ray | Healdton, OK 73438 | Oil Operator | Jan 1995 |
| 590 | Smith C W & Associates Inc | Oklahoma City, OK 73178-0105 | Oil & Gas Operator | Aug 2013 |
| 591 | Smith Energy Company LLC | Purcell, OK 73080-4772 | Oil & Gas Operator | May 2015 |
| 592 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 593 | Sonata Oil & Gas Corp Inc | Stratford, OK 74812 | Oil & Gas Operator | Apr 2014 |
| 594 | Sooner Exploration & Development Co Inc | Enid, OK 73702-3525 | Oil & Gas Operator | Oct 2023 |
| 595 | Sooner Oilfield Services Inc | Piedmont, OK 73078-0810 | Oil & Gas Operator | May 2024 |
| 596 | Southerland Joe Don Dba Taylor Oil Co | Duncan, OK 73533 | Oil & Gas Operator | Apr 2026 |
| 597 | Southerland Marquieta Dba Keta Oil Company | Loco, OK 73442 | Oil & Gas Operator | Apr 2026 |
| 598 | Southern Oklahoma Production | Wilson, OK 73463-6537 | Oil & Gas Operator | May 2026 |
| 599 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | Mar 2026 |
| 600 | Southwestern Exploration Consultants Inc | Oklahoma City, OK 73118-1116 | Oil & Gas Operator | May 2026 |