| 1 | S & S Oil | Ponca City, OK 74601 | Oil & Gas Operator | Dec 2025 |
| 2 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 3 | Samuel Gary Jr. & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | Mar 2026 |
| 4 | San Marco Petroleum Inc | Denver, CO 80293 | Oil & Gas Operator | Apr 2026 |
| 5 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2026 |
| 6 | Sovereign Operating Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2016 |
| 7 | Spess Oil Company, A General Partnership | Cleveland, OK 74020 | Oil & Gas Operator | Mar 2026 |
| 8 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Mar 2026 |
| 9 | Stewart, William C. | Amarillo, TX 79105 | Gas Operator | May 2003 |
| 10 | Stone Oil Compan | | Oil Operator | Jan 1990 |
| 11 | Stone, D J | Palo Alto, CA 94301 | Oil & Gas Operator | Sep 1985 |
| 12 | Stonegate Ranch LLC | Caney, KS 67333 | Oil & Gas Operator | Mar 2026 |
| 13 | Stromquist C Dal | | Oil & Gas Operator | Aug 1991 |
| 14 | Stromquist, C. Dale, A General Partnership | Liberal, KS 67901 | Oil & Gas Operator | Aug 2010 |
| 15 | Suerte Oil Compa | | Oil & Gas Operator | Oct 1995 |
| 16 | Superior Oil Com | | Oil & Gas Operator | Dec 1994 |