| 601 | Renco Energy Inc | Calgary, AB T2H 0H6 | Oil & Gas Operator | Feb 2025 |
| 602 | Rensark Energy Company Inc | Oklahoma City, OK 73105-5208 | Oil & Gas Operator | Apr 2015 |
| 603 | Research Oil Company Inc | Norman, OK 73070-8776 | Oil & Gas Operator | Aug 2019 |
| 604 | Resource Oil And Gas, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2026 |
| 605 | Resource Operations Inc | Tulsa, OK 74157 | Oil & Gas Operator | May 2016 |
| 606 | RF Operating And Supply Inc | | Oil & Gas Operator | Feb 2013 |
| 607 | Rhoades Oil Co | Tulsa, OK 74136-5575 | Oil & Gas Operator | Aug 2013 |
| 608 | Rhodes-Fielding Corporation | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |
| 609 | Richard W Thompson Inc | Plano, TX 75075 | Oil & Gas Operator | Jul 2019 |
| 610 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2026 |
| 611 | Ricks Expl Acquisition LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2013 |
| 612 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2026 |
| 613 | River Valley Oil LLC | Konawa, OK 74849 | Oil Operator | Feb 2026 |
| 614 | Riverstone Energy LLC | Seminole, OK 74868 | Oil & Gas Operator | Dec 2025 |
| 615 | Rives Owen H | Holdenville, OK 74848-0913 | Oil & Gas Operator | Nov 2000 |
| 616 | Rixleben Jeffrey | West Chicago, IL 60186-0978 | Oil Operator | Feb 2016 |
| 617 | Rixleben Thomas B Estate | Ada, OK 74820 | Oil & Gas Operator | Mar 2014 |
| 618 | RJ Williams Oil & Gas LLC | Ardmore, OK 73401 | Oil & Gas Operator | Dec 2025 |
| 619 | RKR Exploration Inc | Seminole, OK 74868 | Oil & Gas Operator | Feb 2026 |
| 620 | Roadrunner Energy Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2015 |
| 621 | Roberson David A | Ada, OK 74821-0008 | Oil & Gas Operator | Jul 2010 |
| 622 | Roberson Oil Company | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 623 | Robinowitz Oil Company | Tulsa, OK 74136-1429 | Oil & Gas Operator | Feb 2023 |
| 624 | Robson & Shults Prod Corp | Mannford, OK 74044 | Oil & Gas Operator | Jun 1995 |
| 625 | Rockwell Drilling Company | New York, NY 10013 | Oil & Gas Operator | Dec 2005 |
| 626 | Rocky Roads Operating LLC | Tulsa, OK 74103-4048 | Oil & Gas Operator | Feb 2026 |
| 627 | Rodman Petroleum Corp. | Odessa, TX 79768 | Oil & Gas Operator | Jul 2023 |
| 628 | Roff Operating Company LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 629 | Rose Operating Company | Tulsa, OK 74101-2391 | Oil & Gas Operator | Dec 2014 |
| 630 | Rosenthal Henry & Co | | Oil Operator | Feb 1994 |
| 631 | Roulston Pat | Konawa, OK 74849-4020 | Oil Operator | Feb 2026 |
| 632 | Roxanna Oil Company | Oklahoma City, OK 73120-2717 | Oil Operator | Aug 2016 |
| 633 | Royal Drilling Inc | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 634 | Royalty Energy Development LLC | Edmond, OK 73003 | Oil & Gas Operator | Feb 2026 |
| 635 | Rumley Robert A & Associates | Tulsa, OK 74135-1907 | Oil Operator | Feb 2026 |
| 636 | Rwit Company Inc | Tulsa, OK 74131-4255 | Oil & Gas Operator | Jul 2018 |
| 637 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 638 | S & K Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jul 1994 |
| 639 | S & S Oil & Gas Corporation | Okemah, OK 74859-0659 | Oil & Gas Operator | Sep 2014 |
| 640 | Salt Creek Energy Company LLC | Shawnee, OK 74802-1505 | Oil & Gas Operator | Jan 2026 |
| 641 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 642 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 643 | San Francisco-Okla Pet Ex Inc | | Oil & Gas Operator | Apr 2014 |
| 644 | Sand Point Production Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Jan 2026 |
| 645 | Sandpoint Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Nov 2025 |
| 646 | Sanford Casondra | Ada, OK 74820-4460 | Oil & Gas Operator | May 2013 |
| 647 | Sanook Inc | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Jan 2007 |
| 648 | Santa Fe Operating LLC | Frisco, TX 75034 | Oil & Gas Operator | Apr 2026 |
| 649 | Santa Rita Resources Inc & Subs | | Oil & Gas Operator | Mar 2015 |
| 650 | Sasakwa Operating LLC | Oklahoma City, OK 73179-1902 | Oil & Gas Operator | Jan 2026 |
| 651 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 652 | Schonwald Supply Company | Oklahoma City, OK 73101-1571 | Oil & Gas Operator | May 1999 |
| 653 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 654 | Seals And Brown Oil Operating | Norman, OK 73072-3020 | Oil & Gas Operator | Sep 2024 |
| 655 | Seals Oil Company | Fox, OK 73435-0222 | Oil & Gas Operator | Nov 2011 |
| 656 | Selco Oil And Gas Inc | Alamo, CA 94507 | Oil & Gas Operator | Feb 2026 |
| 657 | Select Operating Company Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2014 |
| 658 | Seminole Company (The) | | Oil Operator | Dec 1994 |
| 659 | Seminole Oil Productions LLC | Surprise, AZ 85387-2015 | Oil Operator | Apr 2020 |
| 660 | Seminole Tank Service | Seminole, OK 74818-1587 | Oil & Gas Operator | Jan 2026 |
| 661 | Sensor Oil & Gas, Inc. | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 662 | Sentinel Petroleum Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2020 |
| 663 | Sessions Billy C | Muskogee, OK 74401-5323 | Oil Operator | Apr 2007 |
| 664 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Jan 2026 |
| 665 | Shallow Energy Inc | South Dennis, MA 2660 | Oil & Gas Operator | Feb 2025 |
| 666 | Sharber Billy Jack Operating | Konawa, OK 74849-0071 | Oil & Gas Operator | Mar 2015 |
| 667 | Sharber Don E | Okemah, OK 74859-0322 | Oil Operator | Dec 2018 |
| 668 | Sharber Production Inc | Konawa, OK 74849 | Oil & Gas Operator | Dec 2024 |
| 669 | Shaw, T. G. Oil Company, LTD. | Fort Worth, TX 76113 | Oil & Gas Operator | Apr 2026 |
| 670 | Sherman Oil & Gas Co Inc | Chandler, OK 74834-0571 | Oil & Gas Operator | Apr 2020 |
| 671 | Sherman Oil & Gas, L.L.C. | Chandler, OK 74834 | Oil & Gas Operator | Jan 2026 |
| 672 | Shield Operating Co. | Georgetown, TX 78627 | Oil & Gas Operator | Aug 2003 |
| 673 | Shields VIrginia | Kellyville, OK 74039 | Oil & Gas Operator | Jan 2026 |
| 674 | Signature Exploration Inc. | Shawnee, OK 74804-4130 | Oil & Gas Operator | Mar 2015 |
| 675 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Apr 2026 |
| 676 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Feb 2026 |
| 677 | Simasko Production Co | Denver, CO 80204 | Oil & Gas Operator | Nov 1997 |
| 678 | Simco Operating | Shawnee, OK 74804-2501 | Oil Operator | Jan 2013 |
| 679 | Simmons Evelyn B-Per Represent | Edmond, OK 73083-3610 | Oil & Gas Operator | Aug 1996 |
| 680 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2026 |
| 681 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 682 | SJ Ok Oil Company | Dallas, TX 75206-9925 | Oil & Gas Operator | Oct 2025 |
| 683 | SLS Operating LLC | Seminole, OK 74868-5876 | Oil & Gas Operator | Feb 2026 |
| 684 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2026 |
| 685 | Smith Bob W | Ardmore, OK 73403-5214 | Oil & Gas Operator | Sep 2014 |
| 686 | Smith J S Production | Seminole, OK 74868 | Oil & Gas Operator | Feb 2026 |
| 687 | Smith Manus L MFG Inc | Oklahoma City, OK 73147 | Oil & Gas Operator | Nov 1998 |
| 688 | Smith Max Dean | Wewoka, OK 74884 | Oil & Gas Operator | Oct 2025 |
| 689 | Sneed William A Bill | Cleveland, OK 74020-1007 | Oil & Gas Operator | Feb 2026 |
| 690 | Sonata Oil & Gas Corp Inc | Stratford, OK 74812 | Oil & Gas Operator | Apr 2014 |
| 691 | Sooner Drilling Inc | Shawnee, OK 74802-0037 | Oil & Gas Operator | Jan 2005 |
| 692 | Southland Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Aug 2022 |
| 693 | Southstar Oil And Gas Inc | Andover, KS 67002-0123 | Oil & Gas Operator | Jul 2020 |
| 694 | Southwest Exploration Company | Oklahoma City, OK 73132-2230 | Oil & Gas Operator | Jun 2017 |
| 695 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2026 |
| 696 | Speer Kenneth G | Seminole, OK 74818-1202 | Oil & Gas Operator | Dec 2001 |
| 697 | SSB Production LC | Ardmore, OK 73401 | Oil & Gas Operator | Jan 2026 |
| 698 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Feb 2026 |
| 699 | Stalnaker Oil Company | Maud, OK 74854-0295 | Oil Operator | May 2017 |
| 700 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2026 |