| 501 | Petroleum Management Prof Inc | Oklahoma City, OK 73120-1848 | Oil & Gas Operator | Apr 2009 |
| 502 | Petroleum Management, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Apr 2025 |
| 503 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 504 | Petroleum Resources Co | Wichita, KS 67206 | Oil & Gas Operator | May 2000 |
| 505 | Phillips Oil Operating Co | Enid, OK 73703-4921 | Oil & Gas Operator | May 2019 |
| 506 | Pinnacle Corporation (The) | Broken Arrow, OK 74012 | Oil & Gas Operator | Nov 2014 |
| 507 | Pioneer Resources Prod LP | Irving, TX 75039-3745 | Oil & Gas Operator | Feb 2005 |
| 508 | Plains Liquids Transport Inc | Houston, TX 77002 | Oil & Gas Operator | May 1996 |
| 509 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 510 | Plainsmen Energy LLC | Enid, OK 73703-5747 | Oil & Gas Operator | Feb 2025 |
| 511 | Pollok Energy LLC | Tulsa, OK 74159 | Oil & Gas Operator | Feb 2025 |
| 512 | Polo Operating Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2006 |
| 513 | Porter John B | Ketchum, OK 74349-0207 | Oil & Gas Operator | May 2000 |
| 514 | Porter John E "Gene" | Cushing, OK 74023 | Oil & Gas Operator | Aug 2000 |
| 515 | Post Oak Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2013 |
| 516 | Prime Energy Corp | Charleston, WV 25301-1707-1707 | Oil & Gas Operator | Sep 2015 |
| 517 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 518 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 519 | Producers Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |
| 520 | Psa Inc | Chandler, OK 74834-4222 | Oil & Gas Operator | Jan 2025 |
| 521 | Pullers Oil Company LLC | Blackwell, OK 74631-9512 | Oil & Gas Operator | Feb 2025 |
| 522 | Quad J Oil & Gas LLC | Crescent, OK 73028 | Oil & Gas Operator | Feb 2025 |
| 523 | Quick Draw Tank Trucks Inc | Lamont, OK 74643-0158 | Oil Operator | Oct 1997 |
| 524 | R & B Trucking | Crescent, OK 73028-0775 | Oil & Gas Operator | Nov 2021 |
| 525 | R & S Oil Company | Tonkawa, OK 74653 | Oil & Gas Operator | Nov 2013 |
| 526 | R & S Operating | Perry, OK 73077 | Oil & Gas Operator | Jan 2013 |
| 527 | R C Holdings LLC | Garber, OK 73738-5423 | Oil & Gas Operator | Apr 2017 |
| 528 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2025 |
| 529 | R E Blaik Inc | Edmond, OK 73013-6675 | Oil & Gas Operator | Feb 2025 |
| 530 | R E C Tulsa Corporation | Oklahoma City, OK 73107 | Oil & Gas Operator | Apr 2014 |
| 531 | Ra-Jac LLC | Norman, OK 73072 | Oil & Gas Operator | Feb 2025 |
| 532 | Raf Oil Company | Oklahoma City, OK 73120-1944 | Oil & Gas Operator | Jul 2013 |
| 533 | Rahm Oil Company | Enid, OK 73703 | Oil & Gas Operator | Mar 2011 |
| 534 | Ram Asset Management Co | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 535 | Ram Oil & Gas | Blackwell, OK 74631 | Oil & Gas Operator | May 2013 |
| 536 | Rama Operating Co., Inc. | Stafford, KS 67578 | Oil & Gas Operator | Feb 2025 |
| 537 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 538 | Rampage Energy Inc | Bristow, OK 74010-6415 | Oil & Gas Operator | Apr 2020 |
| 539 | Ramsey Engineering Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 1993 |
| 540 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 541 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 542 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 543 | Red Fork (USA) Investments Inc | Midland, TX 79710-0272 | Oil & Gas Operator | May 2019 |
| 544 | Red Fork Valley Oil & Gas Co | Cushing, OK 74023 | Oil Operator | Dec 2014 |
| 545 | Reliance Trusts | Dallas, TX 75244 | Oil & Gas Operator | Nov 1995 |
| 546 | Renegade Operating Company | Aurora, CO 80016 | Oil & Gas Operator | Aug 2023 |
| 547 | Republic Resources Corporation | Oklahoma City, OK 73102-3081 | Oil & Gas Operator | May 2021 |
| 548 | Resources Operating Co Inc | Enid, OK 73703-1628 | Oil & Gas Operator | Jan 2025 |
| 549 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Jan 2025 |
| 550 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 551 | Rhoades Oil Co | Tulsa, OK 74136-5575 | Oil & Gas Operator | Aug 2013 |
| 552 | Richard C Sullins Credit Shelter Trust | Perry, OK 73077-3201 | Gas Operator | Nov 2024 |
| 553 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 554 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 555 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Feb 2025 |
| 556 | Roberson, Joe | Vernon, TX 76385 | Oil & Gas Operator | Feb 2015 |
| 557 | Rodman Petroleum Corp. | Odessa, TX 79768 | Oil & Gas Operator | Jul 2023 |
| 558 | Ron & Dan'S Oil LTD | Barnsdall, OK 74002-0628 | Oil & Gas Operator | May 2011 |
| 559 | Roth Gary E | Tonkawa, OK 74653-2033 | Oil & Gas Operator | Jan 2020 |
| 560 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 561 | Royalty Petroleum Company | Oklahoma City, OK 73120 | Gas Operator | Feb 2002 |
| 562 | RR Oil Well Operations LLC | Ringwood, OK 73768 | Oil & Gas Operator | Feb 2025 |
| 563 | Russell Oil Company | Haskell, OK 74436 | Oil & Gas Operator | Apr 2014 |
| 564 | S & J Oil Company | Ellinwood, KS 67526 | Oil Operator | Jun 2000 |
| 565 | S M Brothers Investments LLC | Denver, CO 80210-6059 | Oil Operator | Jan 2025 |
| 566 | S T Industries Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 2011 |
| 567 | Sage NR Ok LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2025 |
| 568 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 569 | Samhill LLC | Tonkawa, OK 74653-5533 | Oil & Gas Operator | Jan 2025 |
| 570 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 571 | Sand Point Production Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Jan 2025 |
| 572 | Sandridge Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2018 |
| 573 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Apr 2025 |
| 574 | Sandstone Resources, Inc. | Houston, TX 77043 | Oil & Gas Operator | Apr 2025 |
| 575 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 576 | Santa Fe Energy Operating Partner LP | Midland, TX 79701 | Oil & Gas Operator | Sep 2004 |
| 577 | Schonwald Supply Company | Oklahoma City, OK 73101-1571 | Oil & Gas Operator | May 1999 |
| 578 | Scissortail Energy LLC | Tulsa, OK 74137-3644 | Oil & Gas Operator | Feb 2015 |
| 579 | Scout Energy Corporation | Edmond, OK 73083-1348 | Oil & Gas Operator | Jan 2025 |
| 580 | Seaboard Gas Company | Edmond, OK 73034 | Oil & Gas Operator | Feb 1999 |
| 581 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 582 | Seaport Inc | Oklahoma City, OK 73131 | Oil & Gas Operator | Jan 2025 |
| 583 | Selco Oil And Gas Inc | Alamo, CA 94507 | Oil & Gas Operator | Jan 2025 |
| 584 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 585 | Sentinel Petroleum Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2020 |
| 586 | Sequoyah Energy Holdings LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2025 |
| 587 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 588 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 589 | Settlers Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Apr 1998 |
| 590 | Shawver & Son Inc | Oklahoma City, OK 73154-0778 | Oil & Gas Operator | Oct 2024 |
| 591 | Shawver Energy Inc | Oklahoma City, OK 73154-0683 | Oil & Gas Operator | Apr 2014 |
| 592 | Shebester Inc | Maysville, OK 73057 | Oil & Gas Operator | Nov 1998 |
| 593 | Sheets George M & Judith A | Tonkawa, OK 74653 | Oil & Gas Operator | Jan 2025 |
| 594 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Jan 2025 |
| 595 | Shell Western Expl & Prod Inc | Houston, TX 77251 | Oil & Gas Operator | Mar 2015 |
| 596 | Short Oil Co | Luling, TX 78648 | Oil & Gas Operator | Jan 2025 |
| 597 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Jan 2025 |
| 598 | Singer Fleischaker Oil Op. Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 599 | Smith C W & Associates Inc | Oklahoma City, OK 73178-0105 | Oil & Gas Operator | Aug 2013 |
| 600 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |