| 601 | Texas Gas Transmission Corp. | | Oil Operator | Aug 2003 |
| 602 | Texas Gas Transmission, LLC | Owensboro, KY 42301 | Oil & Gas Operator | Dec 2024 |
| 603 | Texas General Petroleum Corp | | Oil & Gas Operator | Aug 1984 |
| 604 | Texas Green Energy Services LLC | Richmond, TX 77407 | Oil Operator | Jun 2026 |
| 605 | Texas Gulf Gas Corporation | Fayetteville, TX 78940 | Oil & Gas Operator | Jun 2005 |
| 606 | Texas Hydrogen Energy Corp. | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 607 | Texas Ind. Exploration, Inc. | | Oil & Gas Operator | Oct 2001 |
| 608 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Jun 2026 |
| 609 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 610 | Texas Independent Exploration LP | Houston, TX 77024 | Oil & Gas Operator | Mar 2017 |
| 611 | Texas Independent Oil Co., LLC | Argyle, TX 76226 | Oil & Gas Operator | Jun 2026 |
| 612 | Texas International Oper., LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2013 |
| 613 | Texas International Resource LLC | Allen, TX 75013 | Oil Operator | Jun 2026 |
| 614 | Texas Investments | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2008 |
| 615 | Texas Keystone Inc | Oakmont, PA 15139-2072 | Oil & Gas Operator | Nov 2017 |
| 616 | Texas Land & Petro Co., LLC | Carrollton, TX 75010 | Oil & Gas Operator | Jun 2026 |
| 617 | Texas Land & Trading Co, Inc. | Austin, TX 78734 | Oil & Gas Operator | Mar 2008 |
| 618 | Texas Lone Star Petroleum Corp. | Corpus Christ, TX 78401 | Oil & Gas Operator | Dec 2013 |
| 619 | Texas M.O.R., Inc. | Corsicana, TX 75109 | Oil Operator | Sep 2013 |
| 620 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 621 | Texas Meridian Res. Expl., Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1998 |
| 622 | Texas Mineral Group | Midland, TX 79705 | Oil & Gas Operator | Aug 2013 |
| 623 | Texas Moran Exploration Company | Houston, TX 77098 | Oil & Gas Operator | Jun 2023 |
| 624 | Texas Offshore Operations, LLC | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Jun 2026 |
| 625 | Texas Oil & Gas | Denver, CO 80264 | Oil & Gas Operator | Oct 1981 |
| 626 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 627 | Texas Oil And Gas Operating, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Jun 2026 |
| 628 | Texas Oil Company, The | Houston, TX 77018 | Oil & Gas Operator | Aug 2006 |
| 629 | Texas Oil Resources Oper, LLC | Houston, TX 77024 | Oil Operator | Jun 2026 |
| 630 | Texas Onshore Energy, Inc. | Austin, TX 78704 | Oil & Gas Operator | Jun 2026 |
| 631 | Texas Operating & Consult., LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2018 |
| 632 | Texas Operating Partners LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2026 |
| 633 | Texas Pacific Oil Co. | | Oil & Gas Operator | Dec 1980 |
| 634 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2026 |
| 635 | Texas Pharchem Inc. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2019 |
| 636 | Texas Presco, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2025 |
| 637 | Texas Rayco Inc. | Daingerfield, TX 75638 | Oil & Gas Operator | Jun 2026 |
| 638 | Texas Reexploration Operating LC | Fredericksbrg, TX 78624 | Oil & Gas Operator | Jun 2026 |
| 639 | Texas Refining, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2003 |
| 640 | Texas Royalty Corp. | Austin, TX 78746 | Oil & Gas Operator | Jun 2026 |
| 641 | Texas Sands Resources, LLC | Abilene, TX 79603 | Oil Operator | Jun 2026 |
| 642 | Texas Secondary Oil Corporation | Devine, TX 78016 | Oil & Gas Operator | Jun 2026 |
| 643 | Texas Shallow Oil & Gas, LLC | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 644 | Texas South Operating Co, Inc. | Houston, TX 77027 | Oil Operator | Jun 2026 |
| 645 | Texas Southern Petroleum Corp. | Corpus Christ, TX 78410 | Oil & Gas Operator | Jun 2026 |
| 646 | Texas Standard Oil Operating Co. | Midland, TX 79705 | Oil & Gas Operator | Oct 2019 |
| 647 | Texas Standard Operating NM LLC | Midland, TX 79705 | Oil & Gas Operator | Mar 2026 |
| 648 | Texas State Oil Co. | Irving, TX 75062 | Oil & Gas Operator | Mar 2017 |
| 649 | Texas Sunset Energy And Ent Inc | Victoria, TX 77904 | Oil Operator | Aug 2003 |
| 650 | Texas T Oil Co. | | Oil & Gas Operator | Apr 1990 |
| 651 | Texas Tea Of Colorado LLC Dba Texas Tea LLC | | Oil & Gas Operator | Jun 2021 |
| 652 | Texas Tea Oil Company | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2011 |
| 653 | Texas Trade International Inc. | Andrews, TX 79714 | Oil Operator | Jun 2026 |
| 654 | Texas United Geoproduction, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Jun 2026 |
| 655 | Texas United Petroleum Inc | Dallas, TX 75243 | Oil & Gas Operator | Jun 2003 |
| 656 | Texas Utilities Fuel Co. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2018 |
| 657 | Texas Utilities Mining Co. | Dallas, TX 75201 | Oil & Gas Operator | May 1995 |
| 658 | Texas Valley Oil & Gas, LLC | Hidalgo, TX 78557 | Oil Operator | Jun 2026 |
| 659 | Texas Vanguard Oil Company | Austin, TX 78720 | Oil & Gas Operator | Jan 2014 |
| 660 | Texas Western Energy Corporation | Portland, TX 78374 | Oil & Gas Operator | Nov 2002 |
| 661 | Texas Western Oil Company | Sioux Falls, SD 57109 | Oil & Gas Operator | Sep 2013 |
| 662 | Texas, Les & Co. | Brenham, TX 77833 | Oil & Gas Operator | Jun 2026 |
| 663 | Texas, Les C., LTD. | Houston, TX 77095 | Oil & Gas Operator | Dec 2006 |
| 664 | Texas-Australia Power Inc. | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2011 |
| 665 | Texas-Ohio Producing Company | Spring, TX 77383 | Oil & Gas Operator | Jul 1995 |
| 666 | Texasgulf Inc. | Newgulf, TX 77462 | Oil & Gas Operator | Jul 1994 |
| 667 | Texcal Energy (GP) LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2016 |
| 668 | Texcal Oil Co | Cuero, TX 77954 | Oil & Gas Operator | Feb 2006 |
| 669 | Texcal Oil Inc. | Vidor, TX 77662 | Oil & Gas Operator | Jun 1994 |
| 670 | Texcal Resources, Inc. | Plano, TX 75094 | Oil & Gas Operator | Apr 1994 |
| 671 | Texcel Exploration, Inc. | Colorado SPGS, CO 80960 | Oil & Gas Operator | Jun 2026 |
| 672 | Texcrude Services LLC | Iowa Park, TX 76367 | Oil Operator | Jun 2026 |
| 673 | Texdon Operating | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2005 |
| 674 | Texeast Operating Co., Inc. | Farmers BRNCH, TX 75234 | Oil Operator | Jun 2026 |
| 675 | Texegy Operating Company LLC | Corpus Christ, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 676 | Texex Petroleum Corporation | | Oil & Gas Operator | Dec 2024 |
| 677 | Texian Energy Corporation | Amarillo, TX 79120 | Oil & Gas Operator | Apr 1997 |
| 678 | Texian Operating Company, LLC | Irving, TX 75063 | Oil & Gas Operator | Jun 2026 |
| 679 | Texical, Inc. | Katy, TX 77491 | Oil & Gas Operator | Jun 2026 |
| 680 | Texinia Corp | Dallas, TX 75201 | Oil & Gas Operator | Jun 2015 |
| 681 | Texinia Limited Partnership | Dallas, TX 75201 | Gas Operator | Jan 2017 |
| 682 | Texinia Oil & Gas Inc | Dallas, TX 75214 | Oil & Gas Operator | Mar 2026 |
| 683 | Texkan Exploration LLC | Plainville, KS 67663 | Oil Operator | Dec 2019 |
| 684 | Texkan Resources, LLC | Odessa, TX 79765 | Oil & Gas Operator | Jun 2025 |
| 685 | Texla Operating Co | Jonesville, TX 75659 | Oil & Gas Operator | Jun 2026 |
| 686 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 687 | Texlan Oil Company, L.C. | Tyler, TX 75711 | Oil & Gas Operator | Aug 2003 |
| 688 | Texland Petroleum Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2003 |
| 689 | Texland Petroleum, L.P. | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2026 |
| 690 | Texland Petroleum-Hobbs, L.L.C. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2026 |
| 691 | Texland-Rector & Schumacher | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2000 |
| 692 | Texland/JMC Joint Venture | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2002 |
| 693 | Texlark Exploration Company, Inc | Plano, TX 75074 | Oil & Gas Operator | Sep 2001 |
| 694 | Texocan Minerals Inc | Tulsa, OK 74147 | Oil & Gas Operator | Dec 2000 |
| 695 | Texoil Company | | Oil & Gas Operator | Dec 2000 |
| 696 | Texokan Energy C | | Oil Operator | Nov 1986 |
| 697 | Texokan Operating, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2026 |
| 698 | Texokan Resources, Inc. | Dallas, TX 75206 | Oil Operator | Apr 2012 |
| 699 | Texoma Oil & Gas Corporation | Longview, TX 75604-3137 | Oil Operator | Apr 2014 |
| 700 | Texoma Oil Tools, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |