| 601 | Raf Oil Company | Oklahoma City, OK 73120-1944 | Oil & Gas Operator | Jul 2013 |
| 602 | Rainbow Oil & Gas | Pawhuska, OK 74056-0056 | Oil Operator | Oct 2010 |
| 603 | Rainbow Oil & Gas LLC | Coolville, OH 45723 | Oil & Gas Operator | Dec 2024 |
| 604 | Ram Energy LLC | Tulsa, OK 74152 | Oil & Gas Operator | Dec 2025 |
| 605 | Rampage Energy Inc | Bristow, OK 74010-6415 | Oil & Gas Operator | Apr 2020 |
| 606 | Ramsey Property Management LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Dec 2025 |
| 607 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 608 | Randy And Jan Walker Oil Company LLC | Konawa, OK 74849-9333 | Oil & Gas Operator | Jan 2026 |
| 609 | Ranken Energy Corporation | Edmond, OK 73013 | Oil & Gas Operator | Dec 2025 |
| 610 | Raper Brice Oil Company LLC | Yale, OK 74085-6865 | Oil & Gas Operator | Apr 2015 |
| 611 | Ravil Inc | Edmond, OK 73013 | Gas Operator | Nov 1998 |
| 612 | Rayland Operating LLC | Moro, IL 62067 | Oil Operator | Jun 2023 |
| 613 | Red River Oil & Gas Company | Oklahoma City, OK 73132-5120 | Oil & Gas Operator | Mar 2015 |
| 614 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Mar 2026 |
| 615 | Reed Power Tongs Inc | Seminole, OK 74818 | Oil & Gas Operator | Sep 2025 |
| 616 | Reed Richard L | Shawnee, OK 74802-1462 | Oil Operator | Nov 1993 |
| 617 | Regal Petroleum Services, Inc. | Euless, TX 76039-1127 | Oil & Gas Operator | May 2015 |
| 618 | Reid Williams Operating Inc | Shreveport, LA 71106-6223 | Oil & Gas Operator | Dec 2025 |
| 619 | Renco Energy Inc | Calgary, AB T2H 0H6 | Oil & Gas Operator | Feb 2025 |
| 620 | Research Oil Company Inc | Norman, OK 73070-8776 | Oil & Gas Operator | Aug 2019 |
| 621 | Revere Corporation | Fort Smith, AR 72902-0908 | Oil & Gas Operator | Feb 2015 |
| 622 | Revilo Exploration LLC | Edmond, OK 73034 | Oil & Gas Operator | Apr 2020 |
| 623 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 624 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Mar 2026 |
| 625 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2026 |
| 626 | River City Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Nov 1997 |
| 627 | River Valley Oil LLC | Konawa, OK 74849 | Oil Operator | Jan 2026 |
| 628 | Rives Owen H | Holdenville, OK 74848-0913 | Oil & Gas Operator | Nov 2000 |
| 629 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2026 |
| 630 | Rixleben Jeffrey | West Chicago, IL 60186-0978 | Oil Operator | Feb 2016 |
| 631 | Rixleben Thomas B Estate | Ada, OK 74820 | Oil & Gas Operator | Mar 2014 |
| 632 | RKR Exploration Inc | Seminole, OK 74868 | Oil & Gas Operator | Dec 2025 |
| 633 | RLB Investments LLC | Holdenville, OK 74848-9421 | Oil Operator | Jul 2017 |
| 634 | Roberson David A | Ada, OK 74821-0008 | Oil & Gas Operator | Jul 2010 |
| 635 | Roberson Oil Company | Houston, TX 77046 | Oil & Gas Operator | Jan 2026 |
| 636 | Robson & Shults Prod Corp | Mannford, OK 74044 | Oil & Gas Operator | Jun 1995 |
| 637 | Rockwell Drilling Company | New York, NY 10013 | Oil & Gas Operator | Dec 2005 |
| 638 | Rodman Petroleum Corp. | Odessa, TX 79768 | Oil & Gas Operator | Jul 2023 |
| 639 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 640 | Rogers Dan R | Okemah, OK 74847 | Oil & Gas Operator | Apr 2020 |
| 641 | Rogers Jerry L | Cushing, OK 74023-0911 | Oil & Gas Operator | Mar 2017 |
| 642 | Ronan Company | Springfield, MO 65704 | Oil & Gas Operator | Aug 2013 |
| 643 | Rose Rock Resources Inc | Wagoner, OK 74467-8362 | Oil & Gas Operator | Dec 2025 |
| 644 | Rover Operating, LLC | Chicago, IL 60606 | Oil & Gas Operator | Dec 2025 |
| 645 | Rumble Energy LLC | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2026 |
| 646 | Rumley Robert A & Associates | Tulsa, OK 74135-1907 | Oil Operator | Dec 2025 |
| 647 | Rupe Oil Company Inc | Wichita, KS 67278 | Oil & Gas Operator | Sep 2025 |
| 648 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Dec 2025 |
| 649 | Rwit Company Inc | Tulsa, OK 74131-4255 | Oil & Gas Operator | Jul 2018 |
| 650 | S & S Star Operating, LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2023 |
| 651 | S & W Engine Supply | Oklahoma City, OK 73107 | Oil Operator | Jun 2003 |
| 652 | Sabco Operating Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2018 |
| 653 | Saber Industries LP | Dallas, TX 75230 | Oil Operator | Dec 2024 |
| 654 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2026 |
| 655 | Safire Resources LLC (Osage Only) | | Oil & Gas Operator | Dec 2025 |
| 656 | Salty Dog Disposal LLC | Cement, OK 73017 | Oil Operator | Feb 2026 |
| 657 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 658 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 659 | San Francisco-Okla Pet Ex Inc | | Oil & Gas Operator | Apr 2014 |
| 660 | Sand Point Production Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Dec 2025 |
| 661 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Mar 2026 |
| 662 | Sandy Petroleum Inc | Shawnee, OK 74801-5634 | Oil & Gas Operator | Dec 2025 |
| 663 | Sanford Casondra | Ada, OK 74820-4460 | Oil & Gas Operator | May 2013 |
| 664 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2026 |
| 665 | Sanook Inc | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Jan 2007 |
| 666 | Santa Fe Operating LLC | Frisco, TX 75034 | Oil & Gas Operator | Mar 2026 |
| 667 | Sasakwa Operating LLC | Oklahoma City, OK 73179-1902 | Oil & Gas Operator | Nov 2025 |
| 668 | Scissortail Energy LLC | Tulsa, OK 74137-3644 | Oil & Gas Operator | Jan 2026 |
| 669 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 670 | Seaport Inc | Oklahoma City, OK 73131 | Oil & Gas Operator | Dec 2025 |
| 671 | Seminole Tank Service | Seminole, OK 74818-1587 | Oil & Gas Operator | Dec 2025 |
| 672 | Sensor Oil & Gas, Inc. | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 673 | Sentinel Petroleum Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2020 |
| 674 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 675 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Jan 2026 |
| 676 | Shallow Energy Inc | South Dennis, MA 2660 | Oil & Gas Operator | Feb 2025 |
| 677 | Sharber Billy Jack Operating | Konawa, OK 74849-0071 | Oil & Gas Operator | Mar 2015 |
| 678 | Sharber Production Inc | Konawa, OK 74849 | Oil & Gas Operator | Dec 2024 |
| 679 | Shields Energy Inc | Fort Smith, AR 72901-4607 | Oil & Gas Operator | Dec 2025 |
| 680 | Shields Operating Inc | Fort Smith, AR 72901-3834 | Oil & Gas Operator | Oct 2021 |
| 681 | Signature Exploration Inc. | Shawnee, OK 74804-4130 | Oil & Gas Operator | Mar 2015 |
| 682 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Mar 2026 |
| 683 | Simcoe Oil Company | Scottsdale, AZ 85258-2553 | Oil & Gas Operator | May 2020 |
| 684 | Simmons Donald M | Muskogee, OK 74401 | Oil & Gas Operator | May 2013 |
| 685 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 686 | SJ Ok Oil Company | Dallas, TX 75206-9925 | Oil & Gas Operator | Oct 2025 |
| 687 | SLS Operating LLC | Seminole, OK 74868-5876 | Oil & Gas Operator | Dec 2025 |
| 688 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Mar 2026 |
| 689 | Smith J S Production | Seminole, OK 74868 | Oil & Gas Operator | Dec 2025 |
| 690 | Smith Max Dean | Wewoka, OK 74884 | Oil & Gas Operator | Oct 2025 |
| 691 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Mar 2026 |
| 692 | Smith Terry | Wewoka, OK 74884 | Oil & Gas Operator | Mar 2015 |
| 693 | Sonata Oil & Gas Corp Inc | Stratford, OK 74812 | Oil & Gas Operator | Apr 2014 |
| 694 | Sopac Exploration Inc | Drumright, OK 74030 | Oil & Gas Operator | Jun 1993 |
| 695 | Southerland Jackie Dale Dba Skyden Oil | Duncan, OK 73533-5392 | Oil & Gas Operator | Dec 2025 |
| 696 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jan 2026 |
| 697 | Southwest Energy LP | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 698 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | Jan 2026 |
| 699 | Sparlin J L | Oklahoma City, OK 73156-1446 | Oil Operator | Jan 2026 |
| 700 | Spring Resources, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2007 |