| 601 | Trace Operators, Inc. |  | Oil & Gas Operator | Nov 2024 | 
| 602 | Trafalgar House Oil & Gas Inc. | Houston, TX 77002-7346 | Oil & Gas Operator | Jan 1992 | 
| 603 | Trans Ocean Oil, Inc. |  | Oil & Gas Operator | Sep 1980 | 
| 604 | Transcontinental Oil Corp. |  | Oil & Gas Operator | Sep 1985 | 
| 605 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 | 
| 606 | Triad Energy Corp. Of Texas | Houston, TX 77057-2696 | Oil & Gas Operator | Sep 2014 | 
| 607 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 | 
| 608 | Triumph Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2015 | 
| 609 | Two Bayous, Inc. |  | Oil & Gas Operator | Dec 2024 | 
| 610 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 | 
| 611 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 | 
| 612 | Union Exploration Partners, LTD. |  | Oil & Gas Operator | Aug 1990 | 
| 613 | Union Gas Operating Company | Houston, TX 77014 | Oil & Gas Operator | Oct 2025 | 
| 614 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 | 
| 615 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 | 
| 616 | Union Texas Petroleum Corp. | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 | 
| 617 | United Gas Pipe Line Co. |  | Oil Operator | Aug 1993 | 
| 618 | United Operators, Inc. |  | Oil Operator | Sep 1999 | 
| 619 | United Petroleum Corporation | Edgwater, CO 80214 | Oil & Gas Operator | May 1996 | 
| 620 | Universal Drilling Co., Inc. | Denver, CO 80203 | Oil & Gas Operator | Sep 2003 | 
| 621 | Unocal Exploration Corporation | Houston, TX 77001 | Oil & Gas Operator | May 1992 | 
| 622 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Oct 2025 | 
| 623 | Us Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | Aug 2025 | 
| 624 | Van Operating, LTD. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 | 
| 625 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Jun 2025 | 
| 626 | Vega Oil & Gas MGMT., Inc. |  | Oil & Gas Operator | Aug 1981 | 
| 627 | Venture Oil Company Of Texas |  | Oil Operator | Sep 1988 | 
| 628 | Verado Energy, Inc. | Allen, TX 75013 | Oil & Gas Operator | Oct 2025 | 
| 629 | Vernon E. Faulconer |  | Oil & Gas Operator | Dec 1996 | 
| 630 | Vernon E. Faulconer, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2024 | 
| 631 | Victory Financial Group, Inc. |  | Oil & Gas Operator | Sep 2002 | 
| 632 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | May 2025 | 
| 633 | Vista Resources LLC | Teague, TX 75860 | Oil & Gas Operator | Oct 2025 | 
| 634 | Volvo Petroleum, Inc. |  | Oil & Gas Operator | Jul 1984 | 
| 635 | W. H. Hunt |  | Oil & Gas Operator | Jan 1984 | 
| 636 | W. L. Estis |  | Oil & Gas Operator | Dec 1999 | 
| 637 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 | 
| 638 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 | 
| 639 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 | 
| 640 | Wapiti Operating, LLC | Houston, TX 77043 | Oil & Gas Operator | Oct 2025 | 
| 641 | Warhorse Oil & Gas, LLC |  | Oil & Gas Operator | Dec 2018 | 
| 642 | Warwick Oil Corp. |  | Oil & Gas Operator | Mar 1990 | 
| 643 | Watson Oil Corporation |  | Oil & Gas Operator | Jun 1981 | 
| 644 | Wayman W. Buchanan |  | Oil & Gas Operator | Feb 1986 | 
| 645 | Weaver Oil & Gas Corporation |  | Oil & Gas Operator | Dec 1984 | 
| 646 | Wentworth Production Company |  | Oil & Gas Operator | Aug 1985 | 
| 647 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 | 
| 648 | Westport Oil And Gas Company Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2002 | 
| 649 | White Deer Production Co. Inc. |  | Oil Operator | Jan 1999 | 
| 650 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Oct 2025 | 
| 651 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 | 
| 652 | Whittier Operating Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2007 | 
| 653 | Will Haristy, Jr. |  | Oil & Gas Operator | Nov 2024 | 
| 654 | Williams Exploration Company |  | Oil & Gas Operator | Dec 1986 | 
| 655 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 | 
| 656 | Wintershall Corporation |  | Oil & Gas Operator | Oct 1989 | 
| 657 | Wintershall Oil & Gas Co |  | Oil & Gas Operator | Feb 1980 | 
| 658 | Wle, Inc. |  | Oil & Gas Operator | Feb 2012 | 
| 659 | WM. H. Kenny Consultants, LTD. |  | Oil & Gas Operator | Nov 1991 | 
| 660 | WM. T. Burton Industries, Inc. |  | Oil & Gas Operator | Apr 1988 | 
| 661 | Woodbine Petroleum, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Aug 2003 | 
| 662 | Zachry Exploration, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Oct 2025 | 
| 663 | Zachry Exploration, LLC | San Antonio, TX 78224 | Oil & Gas Operator | Oct 2025 | 
| 664 | Zadeck Energy Group Inc |  | Oil & Gas Operator | Dec 2011 |