| 501 | Petro Speed Inc | Norman, OK 73069-8116 | Oil & Gas Operator | Mar 2015 |
| 502 | Petro-Management Assoc., Inc. | Edmond, OK 73083-2346 | Oil & Gas Operator | Jun 2007 |
| 503 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 504 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 505 | Petroleum Investment Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 506 | Petroleum Properties MGMT. Co. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2014 |
| 507 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 508 | Piper Operating LLC | Stigler, OK 74462 | Oil & Gas Operator | Feb 2025 |
| 509 | Pitco Production Company | Tulsa, OK 74170-2320 | Oil & Gas Operator | May 2013 |
| 510 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 511 | Plains Resources Group LLC | Wynnewood, OK 73098 | Oil & Gas Operator | Feb 2025 |
| 512 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 513 | Plainsmen Energy LLC | Enid, OK 73703-5747 | Oil & Gas Operator | Feb 2025 |
| 514 | Plotner Ralph Oil & Gas Inv Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2021 |
| 515 | Post Oak Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2013 |
| 516 | Prentice Napier & Green Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2025 |
| 517 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2025 |
| 518 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 519 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 520 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 521 | Prospective Investment & Trading | Scottsdale, AZ 85261-4190 | Oil & Gas Operator | Jun 2016 |
| 522 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |
| 523 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 524 | Questar Energy Trading | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2020 |
| 525 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 526 | Quinn Energy Corp | MT Vernon, IN 47620 | Oil & Gas Operator | Oct 1999 |
| 527 | R.E.J.A.S. Energy LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 528 | Ra-Jac LLC | Norman, OK 73072 | Oil & Gas Operator | Feb 2025 |
| 529 | Rachael Exploration Corp | Traverse City, MI 49686 | Oil & Gas Operator | Apr 2001 |
| 530 | Raker Resources LLC | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 531 | Ram Asset Management Co | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 532 | Rambler Oil Co | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 1999 |
| 533 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 534 | Ramsey Nichols Operating Company LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Feb 2025 |
| 535 | Ramsey Property Management LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Dec 2024 |
| 536 | Randy Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 537 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 538 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 539 | Raven Resources LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Jan 2025 |
| 540 | Raw Crude Oil & Gas LLC | Norman, OK 73069 | Oil & Gas Operator | Feb 2025 |
| 541 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 542 | Reading & Bates Petroleum Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 543 | Rebellion Energy LLC | Tulsa, OK 74135-6241 | Oil & Gas Operator | Jun 2022 |
| 544 | Red Eagle Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2005 |
| 545 | Red Plains Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Oct 2017 |
| 546 | Red Rocks Oil & Gas Operating LLC | Oklahoma City, OK 73103-4821 | Oil & Gas Operator | Feb 2025 |
| 547 | Red Wolf Operating LLC | Edmond, OK 73003-2179 | Oil & Gas Operator | Feb 2025 |
| 548 | Redland Development LLC | Cashion, OK 73016-9625 | Oil & Gas Operator | May 2019 |
| 549 | Redline Energy LLC | Dover, OK 73734 | Oil & Gas Operator | Feb 2025 |
| 550 | Regal Petroleum Services, Inc. | Euless, TX 76039-1127 | Oil & Gas Operator | May 2015 |
| 551 | Renegade Oil And Gas LLC | Helena, OK 73741-0162 | Oil & Gas Operator | Dec 2019 |
| 552 | Review Oil & Gas Inc | Edmond, OK 73034-7648 | Oil & Gas Operator | Jan 2025 |
| 553 | Reynolds J W & Associates | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2000 |
| 554 | Rhino Operating Company LLC | Brentwood, TN 37027-8760 | Oil & Gas Operator | Jan 2025 |
| 555 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2025 |
| 556 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 557 | Rimrock Resource Operating LLC | Tulsa, OK 74103-4462 | Oil & Gas Operator | Jan 2025 |
| 558 | Rio Blanco Operating LLC | Victoria, TX 77904 | Oil & Gas Operator | Jan 2025 |
| 559 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 560 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Feb 2025 |
| 561 | RMS Monte Christo, LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Mar 2023 |
| 562 | Roan Resources LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Apr 2024 |
| 563 | Robinson Brothers Drilling Co | | Oil & Gas Operator | Jul 2002 |
| 564 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 565 | Rougeot Oil & Gas Corp | Sperry, OK 74073 | Oil & Gas Operator | Jan 2025 |
| 566 | RTC Resources, LLP | Weatherford, OK 73096 | Oil & Gas Operator | Apr 2025 |
| 567 | Rue Johnny B | Duncan, OK 73533-2019 | Oil & Gas Operator | Jan 2025 |
| 568 | Rupe Oil Company, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Dec 2024 |
| 569 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Jan 2025 |
| 570 | S & S Star Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2023 |
| 571 | S N D Energy Company, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Apr 2025 |
| 572 | S/H Petroleum Corporation | Hennessey, OK 73742-0477 | Oil & Gas Operator | Feb 2016 |
| 573 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 574 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 575 | Salt Plain Pipeline Corp | Edmond, OK 73013 | Oil & Gas Operator | Jun 2010 |
| 576 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 577 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 578 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 579 | Sandlot Oil & Gas LLC | Gruver, TX 79040 | Oil & Gas Operator | Apr 2025 |
| 580 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Apr 2025 |
| 581 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2025 |
| 582 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 583 | Santa Fe-Andover Oil Co | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2000 |
| 584 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 585 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 586 | Scana Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2005 |
| 587 | Scarth Oil & Gas Co | Amarillo, TX 79101 | Oil & Gas Operator | Feb 1999 |
| 588 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 589 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 590 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 591 | Seals And Brown Oil Operating | Norman, OK 73072-3020 | Oil & Gas Operator | Sep 2024 |
| 592 | Search Drilling Company | Houston, TX 77010 | Oil & Gas Operator | Feb 2001 |
| 593 | Seneca Oil Company | Tulsa, OK 74121-1518 | Oil & Gas Operator | Jan 2015 |
| 594 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 595 | Sequent Exploration Inc | | Oil & Gas Operator | Oct 2017 |
| 596 | Seymour Oil Co., Inc. | Edmond, OK 73025 | Oil & Gas Operator | Jul 2011 |
| 597 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Jan 2025 |
| 598 | Shelly Energy Inc. | Berwyn, PA 19312 | Oil & Gas Operator | Feb 2025 |
| 599 | Shoshone Oil And Gas Inc | Lindsay, OK 73052-0217 | Oil & Gas Operator | Jan 2020 |
| 600 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |