| 601 | Rayland Operating LLC | Moro, IL 62067 | Oil Operator | Jun 2023 |
| 602 | Red River Oil & Gas Company | Oklahoma City, OK 73132-5120 | Oil & Gas Operator | Mar 2015 |
| 603 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jul 2025 |
| 604 | Reed Power Tongs Inc | Seminole, OK 74818 | Oil & Gas Operator | Mar 2025 |
| 605 | Reed Richard L | Shawnee, OK 74802-1462 | Oil Operator | Nov 1993 |
| 606 | Regal Petroleum Services Inc | Euless, TX 76039-1127 | Oil & Gas Operator | May 2015 |
| 607 | Reid Williams Operating Inc | Shreveport, LA 71106-6223 | Oil & Gas Operator | Apr 2025 |
| 608 | Renco Energy Inc | Calgary, AB T2H 0H6 | Oil & Gas Operator | Feb 2025 |
| 609 | Research Oil Company Inc | Norman, OK 73070-8776 | Oil & Gas Operator | Aug 2019 |
| 610 | Revere Corporation | Fort Smith, AR 72902-0908 | Oil & Gas Operator | Feb 2015 |
| 611 | Revilo Exploration LLC | Edmond, OK 73034 | Oil & Gas Operator | Apr 2020 |
| 612 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 613 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 614 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2025 |
| 615 | River City Resources Inc | Tulsa, OK 74119 | Oil & Gas Operator | Nov 1997 |
| 616 | River Valley Oil LLC | Konawa, OK 74849 | Oil Operator | May 2025 |
| 617 | Rives Owen H | Holdenville, OK 74848-0913 | Oil & Gas Operator | Nov 2000 |
| 618 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 619 | Rixleben Jeffrey | West Chicago, IL 60186-0978 | Oil Operator | Feb 2016 |
| 620 | Rixleben Thomas B Estate | Ada, OK 74820 | Oil & Gas Operator | Mar 2014 |
| 621 | RKR Exploration Inc | Seminole, OK 74868 | Oil & Gas Operator | Apr 2025 |
| 622 | RLB Investments LLC | Holdenville, OK 74848-9421 | Oil Operator | Jul 2017 |
| 623 | Roberson David A | Ada, OK 74821-0008 | Oil & Gas Operator | Jul 2010 |
| 624 | Roberson Oil Company | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 625 | Robson & Shults Prod Corp | Mannford, OK 74044 | Oil & Gas Operator | Jun 1995 |
| 626 | Rockwell Drilling Company | New York, NY 10013 | Oil & Gas Operator | Dec 2005 |
| 627 | Rodman Petroleum Corp. | Odessa, TX 79768 | Oil & Gas Operator | Jul 2023 |
| 628 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 629 | Rogers Dan R | Okemah, OK 74847 | Oil & Gas Operator | Apr 2020 |
| 630 | Rogers Jerry L | Cushing, OK 74023-0911 | Oil & Gas Operator | Mar 2017 |
| 631 | Ronan Company | Springfield, MO 65704 | Oil & Gas Operator | Aug 2013 |
| 632 | Rose Rock Resources Inc | Wagoner, OK 74467-8362 | Oil & Gas Operator | Apr 2025 |
| 633 | Rover Operating, LLC | Chicago, IL 60606 | Oil & Gas Operator | May 2025 |
| 634 | Rumley Robert A & Associates | Tulsa, OK 74135-1907 | Oil Operator | Apr 2025 |
| 635 | Rupe Oil Company, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Mar 2025 |
| 636 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Apr 2025 |
| 637 | Rwit Company Inc | Tulsa, OK 74131-4255 | Oil & Gas Operator | Jul 2018 |
| 638 | S & S Star Operating, LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2023 |
| 639 | S & W Engine Supply | Oklahoma City, OK 73107 | Oil Operator | Jun 2003 |
| 640 | Sabco Operating Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2018 |
| 641 | Saber Industries LP | Dallas, TX 75254 | Oil Operator | Dec 2024 |
| 642 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 643 | Safire Resources LLC (Osage Only) | | Oil & Gas Operator | Apr 2025 |
| 644 | Salty Dog Disposal LLC | Cement, OK 73017 | Oil Operator | May 2025 |
| 645 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 646 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 647 | San Francisco-Okla Pet Ex Inc | | Oil & Gas Operator | Apr 2014 |
| 648 | Sand Point Production Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Apr 2025 |
| 649 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jul 2025 |
| 650 | Sandy Petroleum Inc | Shawnee, OK 74801-5634 | Oil & Gas Operator | Apr 2025 |
| 651 | Sanford Casondra | Ada, OK 74820-4460 | Oil & Gas Operator | May 2013 |
| 652 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jul 2025 |
| 653 | Sanook Inc | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Jan 2007 |
| 654 | Sasakwa Operating LLC | Oklahoma City, OK 73179-1902 | Oil & Gas Operator | Feb 2025 |
| 655 | Scissortail Energy LLC | Tulsa, OK 74137-3644 | Oil & Gas Operator | Feb 2015 |
| 656 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 657 | Seaport Inc | Oklahoma City, OK 73131 | Oil & Gas Operator | Apr 2025 |
| 658 | Seminole Tank Service | Seminole, OK 74818-1587 | Oil & Gas Operator | Apr 2025 |
| 659 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 660 | Sentinel Petroleum Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2020 |
| 661 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 662 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | May 2025 |
| 663 | Shallow Energy Inc | South Dennis, MA 2660 | Oil & Gas Operator | Feb 2025 |
| 664 | Sharber Billy Jack Operating | Konawa, OK 74849-0071 | Oil & Gas Operator | Mar 2015 |
| 665 | Sharber Production Inc | Konawa, OK 74849 | Oil & Gas Operator | Dec 2024 |
| 666 | Shields Energy Inc | Fort Smith, AR 72901-4607 | Oil & Gas Operator | Apr 2025 |
| 667 | Shields Operating, Inc | Fort Smith, AR 72901-3834 | Oil & Gas Operator | Oct 2021 |
| 668 | Signature Exploration Inc. | Shawnee, OK 74804-4130 | Oil & Gas Operator | Mar 2015 |
| 669 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Jul 2025 |
| 670 | Simcoe Oil Company | Scottsdale, AZ 85258-2553 | Oil & Gas Operator | May 2020 |
| 671 | Simmons Donald M | Muskogee, OK 74401 | Oil & Gas Operator | May 2013 |
| 672 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 673 | SJ Ok Oil Company | Dallas, TX 75206-9925 | Oil & Gas Operator | Apr 2025 |
| 674 | SLS Operating LLC | Seminole, OK 74868-5876 | Oil & Gas Operator | Apr 2025 |
| 675 | SLT Dakota Operating, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Jul 2025 |
| 676 | Smith J S Production | Seminole, OK 74868 | Oil & Gas Operator | Apr 2025 |
| 677 | Smith Max Dean | Wewoka, OK 74884 | Oil & Gas Operator | Dec 2024 |
| 678 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 679 | Smith Terry | Wewoka, OK 74884 | Oil & Gas Operator | Mar 2015 |
| 680 | Sonata Oil & Gas Corp Inc | Stratford, OK 74812 | Oil & Gas Operator | Apr 2014 |
| 681 | Sopac Exploration Inc | Drumright, OK 74030 | Oil & Gas Operator | Jun 1993 |
| 682 | Southerland Jackie Dale Dba Skyden Oil | Duncan, OK 73533-5392 | Oil & Gas Operator | Apr 2025 |
| 683 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | May 2025 |
| 684 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | May 2025 |
| 685 | Sparlin J L | Oklahoma City, OK 73156-1446 | Oil Operator | May 2025 |
| 686 | Spring Resources, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2007 |
| 687 | SRW Operating LLC | Duncan, OK 73534-2087 | Oil & Gas Operator | Sep 2014 |
| 688 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | May 2025 |
| 689 | Stargas Co | Tulsa, OK 74136-5407 | Oil & Gas Operator | Aug 2013 |
| 690 | Starks Leslie | Wetumka, OK 74883-0003 | Oil & Gas Operator | Oct 1995 |
| 691 | Staub, Larry, Inc. | Azle, TX 76020 | Oil & Gas Operator | Jul 2025 |
| 692 | Steele VIctor Patterson | Wewoka, OK 74884-0560 | Oil & Gas Operator | Jan 2001 |
| 693 | Stephen Michael Inc | Midwest City, OK 73130-5200 | Oil & Gas Operator | Oct 2015 |
| 694 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 695 | Stoneriver Energy, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Jul 2025 |
| 696 | Stover Company | Tulsa, OK 74152-0786 | Oil & Gas Operator | Jan 2013 |
| 697 | Stover Oil Company | Konawa, OK 74849-0216 | Oil & Gas Operator | Jul 2002 |
| 698 | Sturman Jay R | Mounds, OK 74047 | Oil & Gas Operator | Apr 2024 |
| 699 | Sultex Oil & Gas Inc | Houston, TX 77059-3126 | Oil & Gas Operator | Aug 2002 |
| 700 | Swadley Et Al | Holdenville, OK 74848-0794 | Oil & Gas Operator | Nov 2014 |