| 301 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Dec 2025 |
| 302 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Dec 2025 |
| 303 | Smith Family LTD Partnership | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2004 |
| 304 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 305 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 306 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 307 | Special JHR Corp | Bridgeville, PA 15017 | Oil & Gas Operator | Dec 2025 |
| 308 | Spitfire Partners, LLC | Dallas, TX 75225 | Oil Operator | Dec 2025 |
| 309 | Spragins, Ed | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 310 | Springfield Oil Services, Inc. | Mamaroneck, NY 10543 | Oil & Gas Operator | Dec 2025 |
| 311 | Spruiell Drilling Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Dec 2025 |
| 312 | Stagg Investment Group, Inc. | Midland, TX 79701 | Oil Operator | May 2013 |
| 313 | Staley, Jack C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 314 | Steinman, Frank C. | Electra, TX 76360 | Oil & Gas Operator | Dec 2025 |
| 315 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 316 | Stephens, Clayton E. | Dallas, TX 75229 | Oil & Gas Operator | Nov 2011 |
| 317 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Dec 2025 |
| 318 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 319 | Swanson, Tom | Electra, TX 76360 | Oil & Gas Operator | Oct 2004 |
| 320 | Swanson, Tommy Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Mar 2017 |
| 321 | Syntax Energy Corporation | Denton, TX 76210 | Oil Operator | Dec 2025 |
| 322 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2025 |
| 323 | T.F. Well Service, L.L.C. | Iowa Park, TX 76367 | Oil Operator | Dec 2025 |
| 324 | Talon Production, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 2025 |
| 325 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 326 | TCT Operating Company, Inc. | Johnson City, TX 78636 | Oil & Gas Operator | Feb 2017 |
| 327 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 328 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 329 | Thomas Production | Electra, TX 76360 | Oil & Gas Operator | Mar 2015 |
| 330 | Thompson, Richard W. Inc. | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 331 | Three Rivers Operating Co LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 332 | Thunderbird Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 333 | Tradition Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 334 | Tradition Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2017 |
| 335 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 336 | Trio Consulting & Management,LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 337 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 338 | Triple "S" Gas, Inc. | Louisville, KY 40255 | Oil & Gas Operator | Dec 2025 |
| 339 | Triton Operating LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2025 |
| 340 | True Wolf Operating, LLC | Iowa Park, TX 76367 | Oil Operator | Dec 2025 |
| 341 | Tucker Resources, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2003 |
| 342 | Twilco Operating LLC | Holliday, TX 76366 | Oil Operator | Dec 2025 |
| 343 | Twilight Energy LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Dec 2025 |
| 344 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | Dec 2025 |
| 345 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2025 |
| 346 | Unitex Oil & Gas, L.L.C. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 347 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2025 |
| 348 | V S Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2025 |
| 349 | Vanek, R. J. | Iowa Park, TX 76367 | Oil & Gas Operator | Dec 2025 |
| 350 | Veneto Exploration, LLC | Richardson, TX 75083 | Oil & Gas Operator | Dec 2025 |
| 351 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 352 | Viejo Services, LLC | Boyd, TX 76023 | Oil & Gas Operator | Dec 2025 |
| 353 | Vinland Texas Services LLC | Electra, TX 76360 | Oil & Gas Operator | Jun 2024 |
| 354 | W.T. Waggoner Estate, Inc. | Vernon, TX 76385 | Oil Operator | Dec 2025 |
| 355 | Waggoner Operating, L.L.C. | Vernon, TX 76385 | Oil Operator | Dec 2025 |
| 356 | Waggoner, W. T., Estate | Vernon, TX 76385 | Oil & Gas Operator | Feb 2018 |
| 357 | Wagman Petroleum, Inc. | Dallas, TX 75202 | Oil & Gas Operator | Dec 2025 |
| 358 | Wagman, Brent A. | Dallas, TX 75202 | Oil & Gas Operator | Dec 2025 |
| 359 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Dec 2025 |
| 360 | Walton Producing Company | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2005 |
| 361 | Walton Producing Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 362 | Walton, W. W. | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 1994 |
| 363 | Wells Oilfield Services, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 364 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 365 | WG Oil, LLC | Wichita Falls, TX 76308 | Oil Operator | Dec 2025 |
| 366 | WG Operating, Inc. | Tulsa, OK 74153 | Oil & Gas Operator | May 2012 |
| 367 | Wharton Oil Co. | Vernon, TX 76384 | Oil & Gas Operator | Dec 2000 |
| 368 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2025 |
| 369 | Wills Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 370 | Wills Oil Holdings, L.L.C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 371 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 372 | WJC, Inc. | Post, TX 79356 | Oil & Gas Operator | Dec 2025 |
| 373 | Wolfson, I. J. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2002 |
| 374 | Woodbine Petroleum, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Aug 2003 |
| 375 | Wortham Operating, LLC | Holliday, TX 76366 | Oil & Gas Operator | Apr 2023 |
| 376 | Wortham, E. H. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 377 | Wortham, Michael R. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 378 | Yates Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 379 | Zajac Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Dec 2025 |