| 501 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 502 | Prime Energy Corp | Charleston, WV 25301-1707-1707 | Oil & Gas Operator | Sep 2015 |
| 503 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Dec 2023 |
| 504 | Princess Three Corporation | Henderson, TX 75653 | Oil & Gas Operator | Apr 2020 |
| 505 | Princess Three Operating, LLC | Henderson, TX 75653 | Oil & Gas Operator | Apr 2024 |
| 506 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 507 | Production Gathering Co | Dallas, TX 75243 | Oil & Gas Operator | Apr 2009 |
| 508 | Prospective Investment & Trading | Scottsdale, AZ 85261-4190 | Oil & Gas Operator | Jun 2016 |
| 509 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |
| 510 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Jan 2024 |
| 511 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2023 |
| 512 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Dec 2023 |
| 513 | Questa Energy Corporation | Amarillo, TX 79159 | Oil & Gas Operator | Apr 2024 |
| 514 | Questar Energy Trading | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2020 |
| 515 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 516 | R & A Moore, Inc. | Cleburne, TX 76033 | Oil & Gas Operator | Apr 2024 |
| 517 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2024 |
| 518 | Ram Asset Management Co | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 519 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 520 | Ramsey George H Estate | Ardmore, OK 73401-3644 | Oil & Gas Operator | Nov 2013 |
| 521 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 522 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2023 |
| 523 | Raven Resources LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Dec 2023 |
| 524 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2024 |
| 525 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 526 | Reading & Bates Petroleum Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 527 | Rebellion Energy LLC | | Oil & Gas Operator | Jun 2022 |
| 528 | Red Bluff Resources Operating LLC | | Oil & Gas Operator | Dec 2023 |
| 529 | Red Hawk Disposal LLC | | Oil Operator | Jun 2023 |
| 530 | Red Hawk Resources Inc | Edmond, OK 73003-3207 | Oil & Gas Operator | Jan 2024 |
| 531 | Red Rock Resources, L.L.C. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2023 |
| 532 | Redland Resources, LLC | Oklahoma City, OK 73127 | Oil & Gas Operator | Jan 2024 |
| 533 | Redline Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 534 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 535 | Resource Oil And Gas, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2024 |
| 536 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Dec 2023 |
| 537 | Revolution Operating Company,LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2024 |
| 538 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 539 | Rives Owen H | Holdenville, OK 74848-0913 | Oil & Gas Operator | Nov 2000 |
| 540 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2024 |
| 541 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Jan 2024 |
| 542 | RMS Monte Christo, LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Mar 2023 |
| 543 | Rockford Energy Partners III,LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2012 |
| 544 | Roff Operating Company LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 545 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 546 | Royal Oaks Petroleum Corp | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2001 |
| 547 | RTC Resources, LLP | Weatherford, OK 73096 | Oil & Gas Operator | Apr 2024 |
| 548 | Rue Johnny B | Duncan, OK 73533-2019 | Oil Operator | Dec 2023 |
| 549 | Rupe Oil Company, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Dec 2023 |
| 550 | S A C Operating Inc | Woodward, OK 73802-1749 | Oil & Gas Operator | Jan 1999 |
| 551 | Sabine Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 552 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 553 | Salty Dog Disposal LLC | | Oil Operator | Feb 2024 |
| 554 | Samson Gas Producing Company | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
| 555 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 556 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 557 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 558 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2024 |
| 559 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 560 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | Apr 2024 |
| 561 | Seabren Gas System Inc | Okla City, OK 73112 | Oil & Gas Operator | Mar 2016 |
| 562 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 563 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 564 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 565 | Semcrude LP | | Oil & Gas Operator | Jul 2008 |
| 566 | Shattuck SWD LLC | | Oil Operator | Mar 2022 |
| 567 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 568 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Dec 2023 |
| 569 | Shell Western Expl & Prod Inc | Houston, TX 77251 | Oil & Gas Operator | Mar 2015 |
| 570 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2023 |
| 571 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Apr 2024 |
| 572 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 573 | Singer Fleischaker Oil Op. Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 574 | Singer Oil Co LLC | Hennessey, OK 73742-0307 | Oil & Gas Operator | Jan 2024 |
| 575 | Singer Oil Company | Oklahoma City, OK 73148 | Oil & Gas Operator | Dec 2023 |
| 576 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2024 |
| 577 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 578 | Smith Production Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 579 | Smokey Trail LLC | Eastlake, CO 80241-1640 | Oil & Gas Operator | Jan 2024 |
| 580 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 581 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 582 | Sooner Exploration & Development Co Inc | Enid, OK 73702-3525 | Oil & Gas Operator | Oct 2023 |
| 583 | South Forty, The, Inc. | Laverne, OK 73848 | Oil & Gas Operator | Mar 2015 |
| 584 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jan 2024 |
| 585 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 586 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 587 | Spartan Resources LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2024 |
| 588 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Jan 2024 |
| 589 | Spring Operating Company | Edmond, OK 73083-2048 | Oil & Gas Operator | Jan 2024 |
| 590 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2023 |
| 591 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 592 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2018 |
| 593 | Stephens Exploration, Inc. | Dallas, TX 75367 | Oil & Gas Operator | Jan 2024 |
| 594 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jan 2024 |
| 595 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 596 | Stevenson Oil Company, Inc. | Lovington, NM 88260 | Oil & Gas Operator | Feb 2024 |
| 597 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 598 | Stone Oak Operating, LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2024 |
| 599 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2023 |
| 600 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Apr 2024 |