| 701 | SV Energy Company, LLC | Corpus Christ, TX 78401 | Oil & Gas Operator | Mar 2017 |
| 702 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 703 | T & T Production Co. | Victoria, TX 77902 | Oil & Gas Operator | Feb 1995 |
| 704 | Tana Oil And Gas Corporation | Irving, TX 75062 | Oil & Gas Operator | Mar 2000 |
| 705 | Taurus Minerals, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 706 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Jun 2026 |
| 707 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jun 2026 |
| 708 | Teal Energy USA, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 2026 |
| 709 | Tempest Energy Resources, LP | Houston, TX 77251 | Oil & Gas Operator | Jun 2013 |
| 710 | Teon Management, LLC | Midland, TX 79704 | Oil & Gas Operator | Mar 2020 |
| 711 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 712 | Tesoro E&P Company, L.P. | San Antonio, TX 78216 | Oil & Gas Operator | Jan 2000 |
| 713 | Tesoro Expl. & Prod. Company | San Antonio, TX 78216 | Gas Operator | Sep 2010 |
| 714 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Jun 2026 |
| 715 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Jun 2026 |
| 716 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 717 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2026 |
| 718 | Texas Royalty Corp. | Austin, TX 78746 | Oil & Gas Operator | Jun 2026 |
| 719 | Texas Southern Petroleum Corp. | Corpus Christ, TX 78410 | Oil & Gas Operator | Jun 2026 |
| 720 | Texas, Les & Co. | Brenham, TX 77833 | Oil & Gas Operator | Jun 2026 |
| 721 | Texas, Les C., LTD. | Houston, TX 77095 | Oil & Gas Operator | Dec 2006 |
| 722 | Texegy Operating Company LLC | Corpus Christ, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 723 | Texokan Operating, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2026 |
| 724 | Texstar Petroleum, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2000 |
| 725 | Thorp Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 726 | Three C Exploration, LLC | Hebbronville, TX 78361 | Oil & Gas Operator | Jun 2026 |
| 727 | Three-C Oil And Gas | Hebbronville, TX 78361 | Oil & Gas Operator | Jun 2026 |
| 728 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2026 |
| 729 | Tidal Petroleum, Inc. | Schertz, TX 78154 | Oil & Gas Operator | Jun 2026 |
| 730 | Tola Production Company | Dallas, TX 75367 | Oil & Gas Operator | Jun 2026 |
| 731 | Trace Operating, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Jun 2026 |
| 732 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 733 | Tracker Oil & Gas, Inc. | Bastrop, TX 78602 | Oil & Gas Operator | Jun 2026 |
| 734 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jun 2026 |
| 735 | Trans-Tex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | Jun 2026 |
| 736 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 737 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 738 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 739 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 740 | Triangle Three Resources L.L.C. | Dallas, TX 75240 | Oil & Gas Operator | Jun 2026 |
| 741 | Trident Corporation | Woodsboro, TX 78393 | Oil & Gas Operator | Jun 2026 |
| 742 | Trinity Gas Corporation | Enid, OK 73702 | Oil & Gas Operator | Jun 2026 |
| 743 | Triple L Oil Company | Corpus Christ, TX 78469 | Oil & Gas Operator | Jan 1998 |
| 744 | Tristar Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Jun 2026 |
| 745 | Trium, LTD. | Laredo, TX 78041 | Oil Operator | Jun 2026 |
| 746 | Tschoepe, Arthur J. | Leakey, TX 78873 | Oil & Gas Operator | Jun 2001 |
| 747 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Jun 2026 |
| 748 | TX Petroleum Company | Corpus Christ, TX 78412 | Oil & Gas Operator | Apr 1996 |
| 749 | U.S. Enercorp, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2004 |
| 750 | U.S. Enercorp, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2019 |
| 751 | U.S. Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 752 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | Jun 2026 |
| 753 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 754 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Jun 2026 |
| 755 | United Operating, LLC *** | Midland, TX 79710 | Oil & Gas Operator | Jun 2026 |
| 756 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Jun 2026 |
| 757 | Uvalde Energy Co. | Austin, TX 78747 | Oil & Gas Operator | Nov 1994 |
| 758 | Valera Oil Company | Kingsland, TX 78639 | Oil & Gas Operator | Apr 2000 |
| 759 | Valley Gathering Company | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 760 | Valley Petrochemicals, LLC | Pharr, TX 78577 | Oil Operator | Jun 2026 |
| 761 | Vaquero Operating | FT Stockton, TX 79735 | Oil & Gas Operator | Jun 2026 |
| 762 | Varas Energy Operating Company, LLC | Houston, TX 77005 | Oil & Gas Operator | Jun 2026 |
| 763 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Feb 2026 |
| 764 | Venus Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2002 |
| 765 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 766 | Virtex Operating Company, Inc. | Corpus Christ, TX 78401 | Oil & Gas Operator | Oct 2023 |
| 767 | Virtex Petroleum Company, Inc. | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Jan 2008 |
| 768 | Vision Oil And Gas LLC | Laredo, TX 78041 | Oil & Gas Operator | Jun 2026 |
| 769 | Vistatex Energy LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 770 | Vortt Exploration Company, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2019 |
| 771 | Voyager Gas Corporation | Spring, TX 77379 | Oil & Gas Operator | Feb 2012 |
| 772 | VT VIstatex Energy LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2026 |
| 773 | Wadi Petroleum Inc | Houston, TX 77014 | Oil & Gas Operator | May 2018 |
| 774 | Wagner & Brown, LTD. | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 775 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2026 |
| 776 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 777 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 778 | Wallis Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Jun 2026 |
| 779 | Ward, E. B. | Alice, TX 78333 | Oil & Gas Operator | Jun 2001 |
| 780 | Warner-Pawel | Alice, TX 78333 | Oil & Gas Operator | Jun 2026 |
| 781 | Waters Eng. & Operating, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Sep 2013 |
| 782 | Welder Exploration & Prod., Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Dec 2022 |
| 783 | Welderxp LTD. | San Antonio, TX 78212 | Oil & Gas Operator | Jun 2026 |
| 784 | Western Energy Group, LLC | Leander, TX 78641 | Oil & Gas Operator | Jun 2026 |
| 785 | Western Pride Resources, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Jan 2011 |
| 786 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Jun 2026 |
| 787 | Whitesands Operating, L.L.C. | Corpus Chrsti, TX 78466 | Oil & Gas Operator | Mar 2025 |
| 788 | Whitesands Resources, L.L.C. | Corpus Chrsti, TX 78466 | Oil Operator | Jun 2019 |
| 789 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 790 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 791 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | Jun 2026 |
| 792 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Jun 2026 |
| 793 | Wilson Hydrocarbon Inc. | Houston, TX 77066 | Oil & Gas Operator | Jun 2026 |
| 794 | Winn Exploration Co., Inc. | Corpus Christ, TX 78401 | Oil & Gas Operator | Jun 2026 |
| 795 | Winslow, Harry C. | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2026 |
| 796 | Wofford, C. J. | El Campo, TX 77437 | Oil & Gas Operator | Jun 2026 |
| 797 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 798 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 799 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 800 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2026 |