| 701 | Sparks, Sidney A., Trustee | Alice, TX 78332 | Oil & Gas Operator | Jun 1996 |
| 702 | Speed, F. Michael, Trustee | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Aug 1998 |
| 703 | Spiller Operating Co., Inc. | Round Rock, TX 78665 | Oil & Gas Operator | May 2015 |
| 704 | Star Oil & Gas | Ben Bolt, TX 78342 | Oil & Gas Operator | Mar 2025 |
| 705 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jan 2025 |
| 706 | Sterling Engine Service, Inc. | Alice, TX 78333 | Oil & Gas Operator | Mar 2025 |
| 707 | Stinger Oil & Gas Inc. | Sherman Oaks, CA 91403 | Oil & Gas Operator | Oct 2013 |
| 708 | Stonegate Operators, Inc. | Addison, TX 75001 | Oil Operator | Mar 2025 |
| 709 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Mar 2025 |
| 710 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 711 | Suemaur Exploration, Inc. | Corpus Chrsti, TX 78470 | Oil & Gas Operator | Mar 2008 |
| 712 | Sun Exploration, Inc. | Alice, TX 78332 | Oil & Gas Operator | Mar 2025 |
| 713 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 714 | Sure Flow Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Mar 2008 |
| 715 | SV Energy Company, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2017 |
| 716 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 717 | T & T Production Co. | Victoria, TX 77902 | Oil & Gas Operator | Feb 1995 |
| 718 | Tana Oil And Gas Corporation | Irving, TX 75062 | Oil & Gas Operator | Mar 2000 |
| 719 | Taurus Minerals, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 720 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Mar 2025 |
| 721 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 722 | Teal Energy USA, Inc. | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 723 | Tempest Energy Resources, LP | Houston, TX 77251 | Oil & Gas Operator | Jun 2013 |
| 724 | Teon Management, LLC | Midland, TX 79704 | Oil & Gas Operator | Mar 2020 |
| 725 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 726 | Tesoro E&P Company, L.P. | San Antonio, TX 78216 | Oil & Gas Operator | Jan 2000 |
| 727 | Tesoro Expl. & Prod. Company | San Antonio, TX 78216 | Gas Operator | Sep 2010 |
| 728 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Mar 2025 |
| 729 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 730 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 731 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 732 | Texas Royalty Corp. | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 733 | Texas Southern Petroleum Corp. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Mar 2025 |
| 734 | Texas, Les & Co. | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 735 | Texas, Les C., LTD. | Houston, TX 77095 | Oil & Gas Operator | Dec 2006 |
| 736 | Texco Operating Co. | San Antonio, TX 78209 | Gas Operator | Aug 2003 |
| 737 | Texegy Operating Company LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 738 | Texokan Operating, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2025 |
| 739 | Texstar Petroleum, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2000 |
| 740 | Thorp Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 741 | Three C Exploration, LLC | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 2025 |
| 742 | Three-C Oil And Gas | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 2025 |
| 743 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2024 |
| 744 | Tidal Petroleum, Inc. | Schertz, TX 78154 | Oil & Gas Operator | Mar 2025 |
| 745 | Tola Production Company | Dallas, TX 75367 | Oil & Gas Operator | Mar 2025 |
| 746 | Trace Operating, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |
| 747 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 748 | Tracker Oil & Gas, Inc. | Bastrop, TX 78602 | Oil & Gas Operator | Mar 2025 |
| 749 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 750 | Trans-Tex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | Mar 2025 |
| 751 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 752 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 753 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 754 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 755 | Triangle Three Resources L.L.C. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 756 | Trident Corporation | Woodsboro, TX 78393 | Oil & Gas Operator | Mar 2025 |
| 757 | Trinity Gas Corporation | Edmond, OK 73003 | Oil & Gas Operator | Mar 2025 |
| 758 | Triple L Oil Company | Corpus Chrsti, TX 78469 | Oil & Gas Operator | Jan 1998 |
| 759 | Tristar Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Mar 2025 |
| 760 | Trium Energy, Inc. | Laredo, TX 78041 | Gas Operator | Jul 2011 |
| 761 | Trium, LTD. | Laredo, TX 78041 | Oil Operator | Mar 2025 |
| 762 | Truth Resources LP | Houston, TX 77090 | Oil Operator | Sep 2021 |
| 763 | Tschoepe, Arthur J. | Leakey, TX 78873 | Oil & Gas Operator | Jun 2001 |
| 764 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Mar 2025 |
| 765 | TX Petroleum Company | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Apr 1996 |
| 766 | U.S. Enercorp, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2004 |
| 767 | U.S. Enercorp, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2019 |
| 768 | U.S. Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 769 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | Mar 2025 |
| 770 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 771 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2025 |
| 772 | United Operating, LLC *** | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 773 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Mar 2025 |
| 774 | Uvalde Energy Co. | Austin, TX 78747 | Oil & Gas Operator | Nov 1994 |
| 775 | Valera Oil Company | Kingsland, TX 78639 | Oil & Gas Operator | Apr 2000 |
| 776 | Valero Marketing & Supply Co | San Antonio, TX 78269-6000 | Oil & Gas Operator | Sep 2023 |
| 777 | Valley Gathering Company | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 778 | Valley Petrochemicals, LLC | Pharr, TX 78577 | Oil Operator | Mar 2025 |
| 779 | Vaquero Operating | FT Stockton, TX 79735 | Oil & Gas Operator | Mar 2025 |
| 780 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Nov 2024 |
| 781 | Venus Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2002 |
| 782 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Dec 2024 |
| 783 | Virtex Operating Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2023 |
| 784 | Virtex Petroleum Company, Inc. | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Jan 2008 |
| 785 | Vision Oil And Gas LLC | Laredo, TX 78041 | Oil & Gas Operator | Mar 2025 |
| 786 | Vistatex Energy LLC | Houston, TX 77057 | Oil & Gas Operator | Jan 2025 |
| 787 | Vortt Exploration Company, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2019 |
| 788 | Voyager Gas Corporation | Spring, TX 77379 | Oil & Gas Operator | Feb 2012 |
| 789 | VT VIstatex Energy LLC | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 790 | Wadi Petroleum Inc | Houston, TX 77014 | Oil & Gas Operator | May 2018 |
| 791 | Wagner & Brown, LTD. | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 792 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 793 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 794 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 795 | Wallis Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 796 | Ward, E. B. | Alice, TX 78333 | Oil & Gas Operator | Jun 2001 |
| 797 | Warner-Pawel | Alice, TX 78333 | Oil & Gas Operator | Mar 2025 |
| 798 | Waters Eng. & Operating, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Sep 2013 |
| 799 | Welder Exploration & Prod., Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Dec 2022 |
| 800 | Welderxp LTD. | San Antonio, TX 78212 | Oil & Gas Operator | Mar 2025 |