| 601 | Tri-County Operating Company | Seguin, TX 78156 | Gas Operator | Feb 1997 |
| 602 | Tri-Ex Petroleum, L.P. | Amarillo, TX 79101 | Oil & Gas Operator | Jan 2013 |
| 603 | Tri-Force Operating, L.L.C. | Royse City, TX 75189 | Oil & Gas Operator | Apr 2024 |
| 604 | Tri-K Production Company, Inc. | Olney, TX 76374 | Oil & Gas Operator | Apr 1996 |
| 605 | Tri-State Exploration & Prod Inc | Marshall, TX 75671 | Oil & Gas Operator | Aug 2003 |
| 606 | Tri-State Resources, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Sep 2012 |
| 607 | Tri-State Sales & Production | Rodessa, LA 71069 | Oil & Gas Operator | Dec 2008 |
| 608 | Tri-Tex Exploration LTD | Abilene, TX 79608 | Oil Operator | Apr 2019 |
| 609 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 610 | Tri-W Oil | Luling, TX 78648 | Oil Operator | Apr 2024 |
| 611 | Tri-W Oil, Inc. | Luling, TX 78648 | Oil Operator | Apr 2007 |
| 612 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 613 | Triag Energy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2014 |
| 614 | Triangle Development Co | Mahtomedi, MN 55115 | Gas Operator | Feb 1982 |
| 615 | Triangle Energy Co. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 616 | Triangle P Development Corp. | Bronte, TX 76933 | Oil & Gas Operator | Apr 2024 |
| 617 | Triangle Three Resources L.L.C. | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 618 | Triax Energy LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2018 |
| 619 | Trich Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2024 |
| 620 | Trico Energy LLC | Hager Hill, KY 41222 | Oil Operator | Dec 2018 |
| 621 | Trico Oil & Gas Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Apr 2024 |
| 622 | Trident Corporation | Woodsboro, TX 78393 | Oil & Gas Operator | Apr 2024 |
| 623 | Triesco, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1996 |
| 624 | Trigeo Energy, LLC | Addison, TX 75001 | Oil & Gas Operator | Apr 2024 |
| 625 | Trilogy Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2024 |
| 626 | Trinidad Energy, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2024 |
| 627 | Trinidad Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | Mar 2008 |
| 628 | Trinidad Petroleum, Inc. | Austin, TX 78711 | Oil & Gas Operator | Apr 2024 |
| 629 | Trinidad Resources, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2024 |
| 630 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Apr 2024 |
| 631 | Trinity Eor, LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2019 |
| 632 | Trinity Gas Corporation | Edmond, OK 73003 | Oil & Gas Operator | Apr 2024 |
| 633 | Trinity Gas Storage, LLC | Flower Mound, TX 75027 | Oil & Gas Operator | Apr 2024 |
| 634 | Trinity Minerals&Operating Corp. | Abilene, TX 79605 | Oil & Gas Operator | Dec 1995 |
| 635 | Trinity Oil And Gas Production, LLC | Kilgore, TX 75663 | Oil Operator | Apr 2024 |
| 636 | Trinity Operating & Prod., Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 637 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 638 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 639 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 640 | Trinity River Operating Company | Oklahoma City, OK 73147 | Oil & Gas Operator | Apr 2024 |
| 641 | Trio Consulting & Management,LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 642 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 643 | Trio Production Company, LLC | Stephens, AR 71764 | Oil Operator | Mar 2024 |
| 644 | Triple "B" Production DRLG Inc | Poynor, TX 75782 | Oil & Gas Operator | Sep 2022 |
| 645 | Triple "G" Oil Company | Clyde, TX 79510 | Oil & Gas Operator | Apr 1999 |
| 646 | Triple "N" Services, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 647 | Triple "S" Gas, Inc. | Dallas, TX 75355 | Oil & Gas Operator | Apr 2024 |
| 648 | Triple "S" Resources Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Jun 1995 |
| 649 | Triple "W" Oil Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 650 | Triple 'A' Energy, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Apr 2024 |
| 651 | Triple C Oil Inc. | Lockhart, TX 78644 | Oil Operator | Aug 2019 |
| 652 | Triple Crown Resources, LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 653 | Triple D Oil & Gas Co., Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Apr 2024 |
| 654 | Triple G Oil & Gas | Sonora, TX 76950 | Oil & Gas Operator | Oct 2022 |
| 655 | Triple G Well Service, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2024 |
| 656 | Triple H Production | Stockdale, TX 78160 | Oil Operator | Apr 2024 |
| 657 | Triple J Investments Inc | Longview, TX 75606 | Oil & Gas Operator | Feb 2023 |
| 658 | Triple J Oil Co. | Pampa, TX 79065 | Oil & Gas Operator | Aug 1996 |
| 659 | Triple L Oil Company | Corpus Chrsti, TX 78469 | Oil & Gas Operator | Jan 1998 |
| 660 | Triple L Operating Company LLC | Gladewater, TX 75647 | Oil Operator | Apr 2024 |
| 661 | Triple M Saltwater Disposal, LP | Kilgore, TX 75663 | Oil Operator | Apr 2024 |
| 662 | Triple Singleton, Inc. | Santa Fe, TX 77510 | Oil & Gas Operator | Dec 2020 |
| 663 | Triple T Resources, LP | Dallas, TX 75205 | Oil & Gas Operator | Dec 2023 |
| 664 | Tripledee Drilling Co Inc | Ardmore, OK 73402-1888 | Oil & Gas Operator | Dec 2015 |
| 665 | Tripower Resources LLC | Ardmore, OK 73402 | Oil & Gas Operator | Apr 2024 |
| 666 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 667 | Tripp & Sons, LLC | Odessa, TX 79768 | Oil & Gas Operator | Apr 2024 |
| 668 | Tripp Oil Company Inc | Houston, TX 77023 | Oil & Gas Operator | Jan 1992 |
| 669 | Tristar Exploration, Inc | Pflugerville, TX 78660 | Oil & Gas Operator | Apr 2024 |
| 670 | Tristar Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Apr 2024 |
| 671 | Tritex Production Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Jan 2013 |
| 672 | Tritex Resources, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2009 |
| 673 | Triton Energy LLC | Wortham, TX 76693 | Oil & Gas Operator | Apr 2024 |
| 674 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 675 | Triton Operating LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Apr 2024 |
| 676 | Trium, LTD. | Laredo, TX 78041 | Oil Operator | Apr 2024 |
| 677 | Triumph Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 678 | Triumph Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 1994 |
| 679 | Trivestco Energy Company | Ponca City, OK 74601 | Oil & Gas Operator | Feb 2024 |
| 680 | Trivista Operating LLC | Giddings, TX 78942 | Oil & Gas Operator | Apr 2024 |
| 681 | Trivium Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2024 |
| 682 | Trojan Oil And Gas | White Deer, TX 79097 | Oil & Gas Operator | Dec 1994 |
| 683 | Trojan Oil Company, LLC | Big Lake, TX 76932 | Oil Operator | Apr 2024 |
| 684 | Troubadour Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Apr 2024 |
| 685 | Troup Oil & Gas, LLC | Oklahoma City, OK 73112 | Oil Operator | Apr 2024 |
| 686 | Trousil & Associates, Inc. | Steamboat SPG, CO 80477 | Oil & Gas Operator | Dec 2006 |
| 687 | Trout Oil Company, Inc. | Odessa, TX 79762 | Oil & Gas Operator | Apr 2024 |
| 688 | TRP Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 689 | True Oil Company | Casper, WY 82602 | Oil & Gas Operator | Aug 2003 |
| 690 | True Oil Company LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2016 |
| 691 | True Wolf Operating, LLC | Iowa Park, TX 76367 | Oil Operator | Apr 2024 |
| 692 | Trueblood Resources, Inc. | Denver, CO 80222 | Oil & Gas Operator | Apr 2024 |
| 693 | Trump Energy | Austin, TX 78734 | Oil & Gas Operator | Mar 2008 |
| 694 | Trumter Petroleum Corporation | Fort Worth, TX 76185 | Oil & Gas Operator | Aug 1998 |
| 695 | Trust Oil Co. | Pine, CO 80470 | Oil & Gas Operator | Apr 2024 |
| 696 | Trustar Operating Company Inc. | Austin, TX 78750 | Oil Operator | Apr 2024 |
| 697 | Trutex Operating, LLC | Haltom City, TX 76117 | Oil & Gas Operator | Apr 2024 |
| 698 | Truth Resources LP | Conroe, TX 77304 | Oil Operator | Sep 2021 |
| 699 | Tryall, Inc | Porter, TX 77365 | Oil & Gas Operator | Apr 2024 |
| 700 | Tryco Exploration, LLC | Plano, TX 75026 | Oil & Gas Operator | Nov 2006 |