| 601 | Sunstone Energy Company | Tulsa, OK 74153 | Oil & Gas Operator | Aug 2009 |
| 602 | Sunterra Energy Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2009 |
| 603 | Sunwest Oklahoma, Inc | Dallas, TX 75231 | Oil & Gas Operator | May 2023 |
| 604 | Suoco Oil Corporation | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 605 | Super Heaters LLC | Houston, TX 77242-1328 | Oil Operator | Mar 2022 |
| 606 | Superior Companies Inc | Bartlesville, OK 74003-2621 | Oil & Gas Operator | May 2013 |
| 607 | Superior Midstream, LLC | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2020 |
| 608 | Superior Oil & Gas Company Of Oklahoma | Calumet, OK 73014-8528 | Oil & Gas Operator | Jan 2024 |
| 609 | Superior Oil & Gas LLC | Ringwood, OK 73768-9658 | Oil & Gas Operator | Nov 2025 |
| 610 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 611 | Superior Production LLC | Ringwood, OK 73768 | Oil & Gas Operator | Nov 2025 |
| 612 | Superior Production MGMT Inc | Calumet, OK 73014 | Oil & Gas Operator | Mar 2015 |
| 613 | Superior Saltwater Disposal LLC | | Oil & Gas Operator | Dec 2016 |
| 614 | Supplyco Inc | Perry, OK 73077 | Oil & Gas Operator | Apr 2014 |
| 615 | Surge Ok Midstream LLC | Oklahoma City, OK 73114 | Oil Operator | Jun 2025 |
| 616 | Survivor Oil Inc | Tulsa, OK 74133 | Oil & Gas Operator | Sep 2007 |
| 617 | Sutton Eddie L Dba Sutton Eddie L Oil Company | Loco, OK 73442-9701 | Oil Operator | Oct 2025 |
| 618 | Sutton Energy LLC | Ada, OK 74820 | Oil & Gas Operator | Oct 2025 |
| 619 | Sutton Oil Company, LLC | Loco, OK 73442 | Oil Operator | Oct 2025 |
| 620 | Sutton-Munson Oil | Edmond, OK 73034 | Oil & Gas Operator | Jun 1999 |
| 621 | Sutton-Rhoads Exploration Inc | | Oil & Gas Operator | Aug 2005 |
| 622 | Swadley Et Al | Holdenville, OK 74848-0794 | Oil & Gas Operator | Nov 2014 |
| 623 | Swadley Roy W & Judith I | Holdenville, OK 74848-0794 | Oil & Gas Operator | Mar 2015 |
| 624 | Swain Clinton Edward | Ochelata, OK 74051-2220 | Oil Operator | Sep 2025 |
| 625 | Swain, Randall R | | Oil Operator | Aug 2000 |
| 626 | Swan Oil Co | Kellyville, OK 74039-5607 | Oil & Gas Operator | Dec 2023 |
| 627 | Swan Richard N | Claremore, OK 74018-0503 | Oil Operator | Aug 2013 |
| 628 | Swanson Douglas L & Sharon | Bartlesville, OK 74003-9319 | Oil Operator | Oct 2025 |
| 629 | Swanson G T | Duncan, OK 73533 | Oil & Gas Operator | Nov 1998 |
| 630 | Swanson, Tommy Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Mar 2017 |
| 631 | Swearingen Robert E Dba Sabo Production | Seminole, OK 74868 | Oil & Gas Operator | Oct 2025 |
| 632 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Oct 2025 |
| 633 | Swenton Michael J | Tulsa, OK 74105 | Oil & Gas Operator | Nov 2025 |
| 634 | Swift A W & Company Inc | Sand Springs, OK 74063-5124 | Oil Operator | Jun 2003 |
| 635 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 636 | Swinea Well Service Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 2015 |
| 637 | Swinkwood Oil Co | | Oil Operator | Apr 2015 |
| 638 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 639 | SWS Operating LLC | Lawton, OK 73501-3236 | Oil Operator | Sep 2024 |
| 640 | Sydson D'Oro Exploration Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 1992 |
| 641 | Sylvan Oil Operating Company | Tulsa, OK 74103-3516 | Oil & Gas Operator | Apr 2016 |
| 642 | Synergex Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 2025 |