| 301 | Scully And Smith Oil Corporation | Salado, TX 76571 | Oil & Gas Operator | Feb 1995 |
| 302 | Scully Energy Corporation | Salado, TX 76571 | Oil & Gas Operator | Mar 2012 |
| 303 | Seaco Production | Dripping SPGS, TX 78620 | Oil & Gas Operator | Feb 2016 |
| 304 | Sellers Lease Service, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Mar 2025 |
| 305 | SGB Oil LLC | Luling, TX 78648 | Oil Operator | Mar 2025 |
| 306 | Shale Operating Co. | Dallas, TX 75356 | Oil & Gas Operator | Mar 2025 |
| 307 | Shefts & Shefts, Inc. | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 308 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Dec 2024 |
| 309 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Mar 2025 |
| 310 | Shiloh Oil Company LLC | Williston, FL 32696 | Oil & Gas Operator | Mar 2025 |
| 311 | Short Oil Co | Luling, TX 78648 | Oil & Gas Operator | Dec 2024 |
| 312 | SHWJ Oil & Gas Co., Inc. | Oil City, LA 71061 | Oil Operator | Mar 2025 |
| 313 | Signal Oil And Gas Company | Colleyville, TX 76034 | Oil & Gas Operator | Mar 2025 |
| 314 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 315 | Solutions Projects And Consulting, LLC | Houston, TX 77070 | Oil Operator | Mar 2025 |
| 316 | Somont Oil Co., Inc. | Spring, TX 77379 | Oil & Gas Operator | Jan 2025 |
| 317 | Sotol Energy, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Mar 2025 |
| 318 | South West Texas Oil & Gas, Inc. | Luling, TX 78648 | Oil & Gas Operator | Feb 2000 |
| 319 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 320 | Southridge Operating Company | San Marcos, TX 78667 | Oil & Gas Operator | Mar 2025 |
| 321 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 322 | Spencer-Cloughly Investments Inc | San Marcos, TX 78666 | Oil & Gas Operator | Aug 2002 |
| 323 | Spiller, H. G. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1993 |
| 324 | Spiller, J. A. Company | Austin, TX 78735 | Oil & Gas Operator | Jan 2016 |
| 325 | Spiller, J.A. | Austin, TX 78735 | Oil & Gas Operator | Jan 2016 |
| 326 | Spiller, Joseph A. | Austin, TX 78746 | Oil & Gas Operator | Oct 1993 |
| 327 | Springs, Jesse | Luling, TX 78648 | Oil & Gas Operator | Jun 1998 |
| 328 | Stevenson, Ken & Associates, Inc | La Grange, TX 78945 | Oil & Gas Operator | Sep 2002 |
| 329 | Stonegate Operators, Inc. | Addison, TX 75001 | Oil Operator | Mar 2025 |
| 330 | Stratco Operating Co., Inc. | Austin, TX 78701 | Oil & Gas Operator | Mar 2025 |
| 331 | Success Oil Company, Inc. | Beverly Hills, CA 90211 | Oil & Gas Operator | Mar 2025 |
| 332 | Syj Oil & Gas | San Antonio, TX 78209 | Oil Operator | Sep 2000 |
| 333 | Syj Oil & Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 334 | T. A. W. Company | Kingsbury, TX 78638 | Oil & Gas Operator | Mar 2025 |
| 335 | T. N. T. Energy Co. | Belcher, LA 71004 | Oil Operator | May 1991 |
| 336 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | Mar 2025 |
| 337 | Tejones Operating Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2025 |
| 338 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 339 | Texas Vanguard Oil Company | Austin, TX 78720 | Oil & Gas Operator | Jan 2014 |
| 340 | Texian Operating Company, LLC | Irving, TX 75063 | Oil & Gas Operator | Mar 2025 |
| 341 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 342 | Texstar Oil & Gas, LLC | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 343 | Thomas Oil & Gas Company | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 344 | Tilmon Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Sep 2012 |
| 345 | Titan Exploration LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2025 |
| 346 | Trace Energy Management Inc | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2025 |
| 347 | Tri-County Operating Company | Seguin, TX 78156 | Gas Operator | Feb 1997 |
| 348 | Trinidad Petroleum, Inc. | Austin, TX 78711 | Oil & Gas Operator | Mar 2025 |
| 349 | Triple C Oil Inc. | Lockhart, TX 78644 | Oil Operator | Aug 2019 |
| 350 | Tristar Exploration, Inc | Pflugerville, TX 78660 | Oil & Gas Operator | Mar 2025 |
| 351 | Truth Resources LP | Houston, TX 77090 | Oil Operator | Sep 2021 |
| 352 | Tuleta Energy Partners, LLC | Norman, OK 73072 | Oil & Gas Operator | Mar 2025 |
| 353 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 354 | TX Lone Star Operating Co, LLC | Sulphur SPGS, TX 75483 | Oil & Gas Operator | Mar 2025 |
| 355 | Txla Energy, Inc. | Houston, TX 77018 | Oil & Gas Operator | Mar 2025 |
| 356 | United Operating, LLC *** | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 357 | USA Superior Energy LLC | Houston, TX 77077 | Oil Operator | Mar 2010 |
| 358 | Uvalde Energy Co. | Austin, TX 78747 | Oil & Gas Operator | Nov 1994 |
| 359 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Dec 2024 |
| 360 | Vintage Petroleum, LLC | Houston, TX 77210 | Oil & Gas Operator | Dec 2019 |
| 361 | Vista Energy Corp. | Good Lettsvle, TN 37072 | Oil & Gas Operator | Mar 2025 |
| 362 | Vomela Resources Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Mar 2025 |
| 363 | W.W. Energy | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 364 | Wehunt Oil Company, Inc. | Dallas, TX 75376 | Oil & Gas Operator | Nov 2002 |
| 365 | Weiss Oil Co. | Streator, IL 61364 | Oil & Gas Operator | Dec 1997 |
| 366 | White Stride LLC | Piedmont, OK 73078 | Oil & Gas Operator | Mar 2025 |
| 367 | Wilco Properties, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Jan 2004 |
| 368 | Winchester Energy Operating Co. | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 369 | Windmill Oil Company | Austin, TX 78747 | Oil & Gas Operator | Mar 2008 |
| 370 | WTXR Operating (Texas), Inc. | Carrollton, TX 75007 | Oil Operator | Mar 2025 |
| 371 | X Stone Energy LLC. | Plano, TX 75093 | Oil & Gas Operator | Mar 2025 |
| 372 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 373 | Ynew Corporation | Austin, TX 78747 | Oil & Gas Operator | Mar 2025 |