| 201 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 202 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2025 |
| 203 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | May 2025 |
| 204 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 205 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 206 | Sonat Exploration Company-MCR | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 207 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 208 | Spitfire Partners, LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 209 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 210 | Strickland, H.W. | Henrietta, TX 76365 | Oil & Gas Operator | Dec 1999 |
| 211 | Suncoast Technical Services Inc | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 212 | Sutherland Energy Co., LLC | Bridgeport, TX 76426 | Oil & Gas Operator | May 2025 |
| 213 | Talon Production, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2025 |
| 214 | Talus Inc | Graham, TX 76450-1210 | Oil & Gas Operator | Feb 2017 |
| 215 | Targo Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 216 | Tascosa Petroleum Corporation | Amarillo, TX 79105 | Oil & Gas Operator | May 2025 |
| 217 | Te-Ray Resources, Inc. | Oklahoma City, OK 73108 | Oil & Gas Operator | Mar 2015 |
| 218 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 219 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | May 2025 |
| 220 | Texakoma E & P, LLC | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 221 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 222 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Jan 2025 |
| 223 | Texoma Oil Tools, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 224 | Thompson, Richard W. Inc. | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 225 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | May 2025 |
| 226 | TK Drilling Corp. | Tulsa, OK 74133 | Oil & Gas Operator | Feb 2025 |
| 227 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | May 2025 |
| 228 | Triangle Three Resources L.L.C. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 229 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | May 2025 |
| 230 | Trio Consulting & Management,LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 231 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 232 | Tsar Energy, LLC | Dallas, TX 75205 | Oil & Gas Operator | May 2025 |
| 233 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 234 | Van Operating, LTD. | Albany, TX 76430 | Oil & Gas Operator | May 2025 |
| 235 | Veneto Exploration, LLC | Richardson, TX 75083 | Oil & Gas Operator | May 2025 |
| 236 | Viola Production Inc | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 237 | Vista Resources, Inc. (A) | Midland, TX 79701 | Oil & Gas Operator | Feb 2000 |
| 238 | Walsh, F. Howard, Jr. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 1994 |
| 239 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 240 | Weber Energy Corporation | Dallas, TX 75219 | Oil & Gas Operator | Feb 2017 |
| 241 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 242 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Mar 2025 |
| 243 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | May 2025 |
| 244 | Willow Creek Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2009 |
| 245 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 246 | WPH Operating Company | Amarillo, TX 79105 | Oil & Gas Operator | Mar 2017 |
| 247 | Xplore Operating, LLC | Arlington, TX 76001 | Oil & Gas Operator | May 2025 |
| 248 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |