| 101 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 102 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 103 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 104 | Special JHR Corp | Bridgeville, PA 15017 | Oil & Gas Operator | Oct 2025 |
| 105 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 106 | Staggered T Oil LLC | Quanah, TX 79252 | Oil Operator | Oct 2025 |
| 107 | Stahl Petroleum Co. | Amarillo, TX 79118 | Oil & Gas Operator | Aug 2003 |
| 108 | Staley Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 109 | Staley, Jack C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 110 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 111 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 112 | Swanson, Tom | Electra, TX 76360 | Oil & Gas Operator | Oct 2004 |
| 113 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 114 | Texoma Oil Tools, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 115 | Thompson, Richard W. Inc. | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 116 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 117 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Jul 2025 |
| 118 | Upham, Chester R., Jr. | Mineral Wells, TX 76067 | Oil & Gas Operator | Aug 2001 |
| 119 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Oct 2025 |
| 120 | W.T. Waggoner Estate, Inc. | Vernon, TX 76385 | Oil Operator | Oct 2025 |
| 121 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 122 | Wes-Tex Drilling Company | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 123 | West Inland Energy, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Oct 2025 |
| 124 | Western Reserves Corporation | Abilene, TX 79608 | Oil & Gas Operator | Jan 2008 |
| 125 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 126 | Wilchar, DR. R. B. | Fort Worth, TX 76185 | Oil & Gas Operator | Jan 2007 |
| 127 | Wilcox Oil Company | Rule, TX 79547 | Oil & Gas Operator | Aug 2008 |
| 128 | Wilcox Petroleum Operating LLC. | Rule, TX 79547 | Oil & Gas Operator | Oct 2025 |
| 129 | Williams, A. Oil | Wichita Falls, TX 76308 | Oil Operator | Oct 2025 |
| 130 | Wortham Operating, LLC | Holliday, TX 76366 | Oil & Gas Operator | Apr 2023 |
| 131 | Wortham, E. H. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |