| 601 | Producers Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |
| 602 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Jan 2024 |
| 603 | Pryor, VIctor W., Jr. | Holdenville, OK 74848 | Oil & Gas Operator | Apr 2017 |
| 604 | Pumping Services Inc | Seminole, OK 74868-2421 | Oil & Gas Operator | Feb 2023 |
| 605 | Q T Oil LTD Co | Seminole, OK 74801 | Oil Operator | Jan 2024 |
| 606 | Quench Oil & Gas Inc | Plano, TX 75075-2902 | Oil & Gas Operator | Apr 2009 |
| 607 | Quest Cherokee LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2023 |
| 608 | R & C Oil And Gas Inc | Ada, OK 74820-3150 | Oil Operator | Jul 2016 |
| 609 | R Baker Oil LLC | Okemah, OK 74859-0621 | Oil & Gas Operator | Feb 2024 |
| 610 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2024 |
| 611 | R H S Inc | Ada, OK 74821-1252 | Oil & Gas Operator | Apr 2020 |
| 612 | R J Exploration LLC | | Oil & Gas Operator | Feb 2024 |
| 613 | R K R Exploration | Seminole, OK 74868-9754 | Oil & Gas Operator | Mar 2015 |
| 614 | R W Production Company Inc | Ada, OK 74821-2693 | Oil & Gas Operator | Apr 2011 |
| 615 | Radford Dale | Konawa, OK 74849-8828 | Oil & Gas Operator | Nov 2023 |
| 616 | Rainbow Energy Inc | | Oil Operator | Feb 2024 |
| 617 | Rainmaker Oil & Gas Corp | Oklahoma City, OK 73112-8883 | Oil & Gas Operator | Apr 2015 |
| 618 | Raizen Oil Company | Velma, OK 73091 | Oil & Gas Operator | Feb 2016 |
| 619 | Ramhead Petroleum Inc | Seminole, OK 74818-0848 | Oil & Gas Operator | Aug 2008 |
| 620 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 621 | Randy And Jan Walker Oil Company LLC | Konawa, OK 74849-9333 | Oil & Gas Operator | Feb 2024 |
| 622 | Ravil Inc | Edmond, OK 73013 | Gas Operator | Nov 1998 |
| 623 | Rawhide Oil Company | | Oil & Gas Operator | Sep 2011 |
| 624 | Rayland Operating LLC | | Oil Operator | Jun 2023 |
| 625 | Reach Oil And Gas Company Inc | | Oil & Gas Operator | Jan 2024 |
| 626 | Reames Jr Keith E | Duncan, OK 73534-0246 | Oil & Gas Operator | Jul 1999 |
| 627 | Red Hawk Disposal LLC | | Oil Operator | Jun 2023 |
| 628 | Red River Oil & Gas Company | Oklahoma City, OK 73132-5120 | Oil & Gas Operator | Mar 2015 |
| 629 | Red Rock Resources, L.L.C. | Wichita Falls, TX 76310 | Oil & Gas Operator | Jan 2024 |
| 630 | Red Rocks Oil & Gas Operating LLC | | Oil & Gas Operator | Feb 2024 |
| 631 | Redhen Oil Company | Oklahoma City, OK 73155-5449 | Oil & Gas Operator | Feb 2024 |
| 632 | Reed Power Tongs Inc | Seminole, OK 74818-1462 | Oil & Gas Operator | Jan 2024 |
| 633 | Reed Richard L | Shawnee, OK 74802-1462 | Oil Operator | Nov 1993 |
| 634 | Reid Williams Operating Inc | Shreveport, LA 71106-6223 | Oil & Gas Operator | Jan 2024 |
| 635 | Renco Energy Inc | Calgary, AB T2H 0H6 | Oil & Gas Operator | Jan 2024 |
| 636 | Rensark Energy Company Inc | Oklahoma City, OK 73105-5208 | Oil & Gas Operator | Apr 2015 |
| 637 | Research Oil Company Inc | Norman, OK 73070-8776 | Oil & Gas Operator | Aug 2019 |
| 638 | Resource Oil And Gas, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2024 |
| 639 | Resource Operations, Inc. | Tulsa, OK 74157 | Oil & Gas Operator | May 2016 |
| 640 | RF Operating And Supply Inc | | Oil & Gas Operator | Feb 2013 |
| 641 | Rhoades Oil Co | Tulsa, OK 74136-5575 | Oil & Gas Operator | Aug 2013 |
| 642 | Rhodes-Fielding Corporation | Edmond, OK 73083-6634 | Oil & Gas Operator | Jan 2024 |
| 643 | Richard W Thompson Inc | Plano, TX 75026 | Oil & Gas Operator | Jul 2019 |
| 644 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2024 |
| 645 | Ricks Expl Acquisition LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2013 |
| 646 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2024 |
| 647 | River Valley Oil LLC | | Oil Operator | Feb 2024 |
| 648 | Riverstone Energy LLC | | Oil & Gas Operator | Feb 2024 |
| 649 | Rives Owen H | Holdenville, OK 74848-0913 | Oil & Gas Operator | Nov 2000 |
| 650 | Rixleben Jeffrey | West Chicago, IL 60186-0978 | Oil Operator | Feb 2016 |
| 651 | Rixleben Thomas B Estate | Ada, OK 74820 | Oil & Gas Operator | Mar 2014 |
| 652 | RJ Williams Oil & Gas LLC | Ardmore, OK 73402-1931 | Oil & Gas Operator | Feb 2024 |
| 653 | RKR Exploration Inc | Seminole, OK 74868-1688 | Oil & Gas Operator | Jan 2024 |
| 654 | Roadrunner Energy, Inc. | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2015 |
| 655 | Roberson David A | Ada, OK 74821-0008 | Oil & Gas Operator | Jul 2010 |
| 656 | Roberson Oil Company | Houston, TX 77046 | Oil & Gas Operator | Jan 2024 |
| 657 | Robinowitz Oil Company | Tulsa, OK 74136-1429 | Oil & Gas Operator | Feb 2023 |
| 658 | Robson & Shults Prod Corp | Mannford, OK 74044 | Oil & Gas Operator | Jun 1995 |
| 659 | Rockwell Drilling Company | New York, NY 10013 | Oil & Gas Operator | Dec 2005 |
| 660 | Rocky Roads Operating LLC | | Oil & Gas Operator | Feb 2024 |
| 661 | Rodman Petroleum Corp. | Odessa, TX 79768 | Oil & Gas Operator | Jul 2023 |
| 662 | Roff Operating Company LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 663 | Rose Operating Company | Tulsa, OK 74101-2391 | Oil & Gas Operator | Dec 2014 |
| 664 | Rosenthal Henry & Co | | Oil Operator | Feb 1994 |
| 665 | Roulston Pat | Konawa, OK 74849-4020 | Oil Operator | Feb 2024 |
| 666 | Roxanna Oil Company | Oklahoma City, OK 73120-2717 | Oil Operator | Aug 2016 |
| 667 | Royal Drilling Inc | Russell, KS 67665 | Oil Operator | Dec 2023 |
| 668 | Royal Oaks Petroleum Corp | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2001 |
| 669 | Royalty Energy Development LLC | Edmond, OK 73083 | Oil & Gas Operator | Feb 2024 |
| 670 | Rumley Robert A & Associates | Tulsa, OK 74135-1907 | Oil Operator | Nov 2023 |
| 671 | Rwit Company Inc | Tulsa, OK 74131-4255 | Oil & Gas Operator | Jul 2018 |
| 672 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 673 | S & K Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jul 1994 |
| 674 | S & S Oil & Gas Corporation | Okemah, OK 74859-0659 | Oil & Gas Operator | Sep 2014 |
| 675 | Salt Creek Energy Company LLC | Shawnee, OK 74802-1505 | Oil & Gas Operator | Jan 2024 |
| 676 | Salty Dog Disposal LLC | | Oil Operator | Mar 2024 |
| 677 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 678 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 679 | San Francisco-Okla Pet Ex Inc | | Oil & Gas Operator | Apr 2014 |
| 680 | Sand Point Production Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Jan 2024 |
| 681 | Sandpoint Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Jan 2024 |
| 682 | Sanford Casondra | Ada, OK 74820-4460 | Oil & Gas Operator | May 2013 |
| 683 | Sanook Inc | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Jan 2007 |
| 684 | Santa Rita Resources Inc & Subs | | Oil & Gas Operator | Mar 2015 |
| 685 | Sasakwa Operating LLC | Oklahoma City, OK 73179-1902 | Oil & Gas Operator | Dec 2023 |
| 686 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 687 | Schonwald Supply Company | Oklahoma City, OK 73101-1571 | Oil & Gas Operator | May 1999 |
| 688 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2024 |
| 689 | Seals And Brown Oil Operating | Norman, OK 73072-3020 | Oil & Gas Operator | Feb 2024 |
| 690 | Seals Oil Company | Fox, OK 73435-0222 | Oil & Gas Operator | Nov 2011 |
| 691 | Selco Oil And Gas Inc | Danville, CA 94526-7638 | Oil & Gas Operator | Jan 2024 |
| 692 | Select Operating Company Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2014 |
| 693 | Semcrude LP | | Oil & Gas Operator | Jul 2008 |
| 694 | Seminole Company (The) | | Oil Operator | Dec 1994 |
| 695 | Seminole Oil Productions LLC | Surprise, AZ 85387-2015 | Oil Operator | Apr 2020 |
| 696 | Seminole Tank Service | Seminole, OK 74818-1587 | Oil & Gas Operator | Jan 2024 |
| 697 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 698 | Sentinel Petroleum Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2020 |
| 699 | Sessions Billy C | Muskogee, OK 74401-5323 | Oil Operator | Apr 2007 |
| 700 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Jan 2024 |