| 501 | United Texas Petroleum Inc. | McKinney, TX 75070 | Oil & Gas Operator | Apr 2025 |
| 502 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Apr 2025 |
| 503 | V/J Oil Company | Yancey, TX 78886 | Oil & Gas Operator | Oct 2015 |
| 504 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Apr 2025 |
| 505 | Valley Petrochemicals, LLC | Pharr, TX 78577 | Oil Operator | Apr 2025 |
| 506 | Valor Energy, LLC | Dallas, TX 75205 | Oil & Gas Operator | May 2023 |
| 507 | Vantage Operating, LLC | San Antonio, TX 78230 | Oil & Gas Operator | Apr 2025 |
| 508 | Varas Energy Operating Company, LLC | Houston, TX 77005 | Oil & Gas Operator | Apr 2025 |
| 509 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Dec 2024 |
| 510 | Viola Prod., Inc. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 511 | Vision Oil And Gas LLC | Laredo, TX 78041 | Oil & Gas Operator | Apr 2025 |
| 512 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 513 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 514 | Wallis Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Apr 2025 |
| 515 | Waters Eng. & Operating, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Sep 2013 |
| 516 | Wayne E. Glenn Associates, Inc. | Dickinson, TX 77539 | Oil & Gas Operator | Jan 2016 |
| 517 | Welder Exploration & Prod., Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Dec 2022 |
| 518 | Western Global Oil, Inc | Deerfld Beach, FL 33442 | Oil Operator | Apr 2025 |
| 519 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 520 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Apr 2025 |
| 521 | Whittier Operating Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2007 |
| 522 | Wilcox Operating Corporation | Shreveport, LA 71115 | Oil & Gas Operator | Apr 2025 |
| 523 | Willstar Energy GP, LLC | Houston, TX 77279 | Oil & Gas Operator | Sep 2013 |
| 524 | WJW Operating Co.,LLC | Austin, TX 78738 | Oil & Gas Operator | May 2002 |
| 525 | Wolsey Well Service, Inc. | Windthorst, TX 76389 | Oil & Gas Operator | Jul 2006 |
| 526 | Wolsey Well Service, L.P. | Bowie, TX 76230 | Oil & Gas Operator | Jun 2014 |
| 527 | Wright Brothers Energy, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Apr 2025 |
| 528 | Wright Brothers Petroleum, LTD. | San Antonio, TX 78212 | Oil & Gas Operator | May 2002 |
| 529 | Wynn-Crosby Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 530 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 531 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 532 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 533 | Zachry, H. B. Company | San Antonio, TX 78205 | Oil & Gas Operator | Apr 1994 |