| 1 | S & B Operating, LLC | Iowa Park, TX 76367 | Oil Operator | Oct 2025 |
| 2 | Saco Oil Company | El Dorado, KS 67042 | Oil Operator | Jan 2001 |
| 3 | Samson Resources | | Oil Operator | Jan 1994 |
| 4 | Satchell Creek Petroleum, LLC | Wichita, KS 67205 | Oil Operator | Jul 2024 |
| 5 | Seed Group/Aa Drilling | | Oil Operator | Oct 2009 |
| 6 | Sheffler Industries | Phoenix, AZ 85013 | Oil Operator | Aug 1999 |
| 7 | Shields Oil Prod | | Oil & Gas Operator | Aug 1995 |
| 8 | Short W D Oil Co | | Oil Operator | Mar 1996 |
| 9 | Silver Creek Oil | Merkel, TX 79536 | Oil & Gas Operator | Aug 2003 |
| 10 | Slo Oil, LLC | El Dorado, KS 67042 | Oil Operator | Nov 2024 |
| 11 | Smitherman, Leon C., Jr. | Andover, KS 67002 | Oil Operator | Dec 2019 |
| 12 | Smokey Valley Resources, Inc. | Geneseo, KS 67444 | Oil Operator | Nov 2008 |
| 13 | Snyder, Jim Estate (Deceased) | Hamilton, KS 66853 | Oil Operator | Dec 2009 |
| 14 | Sonoma Resources LLC | Andover, KS 67002 | Oil & Gas Operator | Jun 2025 |
| 15 | Soule, Richard A. | Eureka, KS 67045 | Oil Operator | Sep 2019 |
| 16 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 17 | Spradco, Inc. | Towanda, KS 67144 | Oil Operator | Jun 2025 |
| 18 | Stebeth Gas Production, Inc. | Beaumont, KS 67012 | Oil Operator | May 1996 |
| 19 | Stelbar Oil Corp | Wichita, KS 67206 | Oil & Gas Operator | Aug 1995 |
| 20 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 21 | Stewart Producers, Inc. | Mount Vernon, IL 62864 | Oil & Gas Operator | Jun 2025 |
| 22 | Suerte Oil Compa | | Oil & Gas Operator | Oct 1995 |
| 23 | Suerte Oil Company | Howard, KS 67349 | Oil & Gas Operator | Jan 2017 |
| 24 | Sundgren, Stephen E. And Jackie | Rosalia, KS 67132 | Oil Operator | Jun 2023 |