| 1 | S & C Resources Inc | Cleveland, OK 74020 | Oil Operator | May 2025 |
| 2 | S & H Tank Service Of Okla | Lindsay, OK 73052 | Oil & Gas Operator | Mar 2017 |
| 3 | S & S Oil Company | Electra, TX 76360 | Oil & Gas Operator | Dec 2025 |
| 4 | S & S Star Operating, LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2023 |
| 5 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 6 | Selby Larry Monroe | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2020 |
| 7 | Sellmeyer Frank | San Rafael, CA 94901-1339 | Oil Operator | Dec 2014 |
| 8 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 9 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Sep 2025 |
| 10 | Shelton Oil Company LLC | Collinsville, OK 74021-5619 | Oil Operator | Aug 2025 |
| 11 | Short Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Aug 2025 |
| 12 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 13 | Smith Connie M & Sheryle | Chelsea, OK 74016-1959 | Oil Operator | Feb 2017 |
| 14 | Smith Jack Boyd | Elkhart, IN 46515-1968 | Oil & Gas Operator | Oct 2011 |
| 15 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | Sep 2025 |
| 16 | SP Energy Development Company | Seattle, WA 98101-3277 | Oil & Gas Operator | Mar 2015 |
| 17 | Sparks Greg | Afton, OK 74331 | Oil & Gas Operator | Oct 2025 |
| 18 | Spencer Oil Company | Borger, TX 79007 | Oil & Gas Operator | Aug 2025 |
| 19 | Spurgeon William Allan | Nowata, OK 74048-9713 | Oil Operator | Feb 2010 |
| 20 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 21 | Sterling Properties Inc | Lawton, OK 73501-9601 | Oil Operator | Jul 2025 |
| 22 | STP Cherokee Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2014 |
| 23 | Stumpff Paul | Bartlesville, OK 74006-3426 | Oil & Gas Operator | Mar 2015 |
| 24 | Subterranean Energy, LLC | Tyler, TX 75705 | Oil & Gas Operator | Dec 2025 |
| 25 | Sunday-Smith Mary E | Mannford, OK 74044-1457 | Oil & Gas Operator | Mar 2015 |
| 26 | Superior Companies Inc | Bartlesville, OK 74003-2621 | Oil & Gas Operator | May 2013 |