| 1 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 2 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 3 | Sandpoint Texas LLC | Houston, TX 77270 | Oil Operator | Dec 2024 |
| 4 | Savannah Oil Co. | Jefferson, TX 75657 | Oil & Gas Operator | Nov 2007 |
| 5 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 6 | Seelye, William L. | Plano, TX 75024 | Oil & Gas Operator | Oct 2005 |
| 7 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 8 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Dec 2024 |
| 9 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 10 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 11 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 12 | Sklar-Tex L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 13 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 14 | Smith Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Dec 2024 |
| 15 | Smith Resources, L.L.C. | Marshall, TX 75671 | Oil & Gas Operator | Dec 2024 |
| 16 | Smith, E.N. III Energy Corp. | Marshall, TX 75671 | Oil & Gas Operator | Sep 2006 |
| 17 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 18 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 19 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | Dec 2024 |
| 20 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 21 | Spear Production Company, Inc. | Shreveport, LA 71161 | Oil Operator | Dec 2024 |
| 22 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 23 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | Dec 2024 |
| 24 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 25 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Dec 2024 |
| 26 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Dec 2024 |
| 27 | Swanson Operating, Inc. | Holliday, TX 76366 | Oil Operator | Dec 2024 |
| 28 | Swanson, Tom | Electra, TX 76360 | Oil & Gas Operator | Oct 2004 |