| 601 | Steward Energy, LLC | Frisco, TX 75034 | Oil & Gas Operator | Nov 2014 |
| 602 | Stivers Inc | Graham, TX 76450 | Oil & Gas Operator | May 2003 |
| 603 | Stivers Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 1995 |
| 604 | Stout Energy Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2026 |
| 605 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Apr 2026 |
| 606 | Stronghold Energy II Oper, LLC | Midland, TX 79702 | Oil & Gas Operator | Aug 2022 |
| 607 | Success Oil Company, Inc. | Beverly Hills, CA 90211 | Oil & Gas Operator | Apr 2026 |
| 608 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Apr 2026 |
| 609 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 610 | Synergex Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Jan 2026 |
| 611 | T & D Oil | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2026 |
| 612 | T.G.B., Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 613 | Tap Rock Operating, LLC | Denver, CO 80203 | Oil & Gas Operator | Apr 2026 |
| 614 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 615 | Taurus Exploration U.S.A., Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 1998 |
| 616 | Taylor, Ben J. Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Feb 2022 |
| 617 | Taylor, J. S. Inc. | Lewisville, TX 75057 | Oil & Gas Operator | Apr 2026 |
| 618 | Taylor-Link Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Apr 2017 |
| 619 | TD Natural Resources LLC | Cuero, TX 77954 | Oil & Gas Operator | Apr 2026 |
| 620 | Teke Production LLC | Houston, TX 77269 | Oil Operator | Apr 2026 |
| 621 | Terrace Petroleum Corporation | Midland, TX 79701 | Oil & Gas Operator | Jul 2013 |
| 622 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Apr 2026 |
| 623 | Texas Consolidated Pet. Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2026 |
| 624 | Texland Petroleum Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2003 |
| 625 | Texland Petroleum, L.P. | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2026 |
| 626 | Texland-Rector & Schumacher | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2000 |
| 627 | Texon Oil Company, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2023 |
| 628 | Three Rivers Operating Co LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 629 | Three-B Oil Company, The | Monahans, TX 79756 | Oil & Gas Operator | Apr 2026 |
| 630 | Thunderbird Drilling, Inc. | Wichita, KS 67207 | Oil Operator | Oct 2008 |
| 631 | Tiburon Oil & Gas, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2000 |
| 632 | Tidwell Production Company | Sonora, TX 76950 | Oil & Gas Operator | Apr 2026 |
| 633 | Titan Resources I, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2000 |
| 634 | Titus Oil & Gas Production, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2022 |
| 635 | Torch Energy Services, Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 636 | TPC Exploration, LLC | May, TX 76857 | Oil & Gas Operator | Apr 2026 |
| 637 | Trans-Tex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | Apr 2026 |
| 638 | Treadaway Oil Co. | Balmorhea, TX 79718 | Oil & Gas Operator | Apr 2026 |
| 639 | Triple "N" Services, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 640 | TRP Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Apr 2026 |
| 641 | TS Oil, LLC | Fort Worth, TX 76114 | Oil & Gas Operator | Apr 2026 |
| 642 | Two Black Bears Oil, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2003 |
| 643 | Two P Partners, LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2026 |
| 644 | TX Heat Of The Permian Basin Inc | Odessa, TX 79768 | Oil & Gas Operator | Dec 2021 |
| 645 | U. S. Energy Development Corporation | Fort Worth, TX 76164 | Oil & Gas Operator | Apr 2026 |
| 646 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Jul 2025 |
| 647 | Ultra Petroleum (U.S.A.), Inc. | Granbury, TX 76048 | Oil & Gas Operator | Sep 2003 |
| 648 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 649 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 650 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2026 |
| 651 | United Energy Corporation | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2026 |
| 652 | United Oil & Minerals L. P. | Austin, TX 78746 | Oil & Gas Operator | Jun 2003 |
| 653 | United Oil & Minerals, Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2001 |
| 654 | United Resources LP | Austin, TX 78746 | Oil & Gas Operator | Oct 2011 |
| 655 | Unitex Oil & Gas, L.L.C. | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 656 | Upp Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 657 | Valley Gathering Company | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 658 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 659 | Vanguard Permian, LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 660 | Vaquero Operating | FT Stockton, TX 79735 | Oil & Gas Operator | Apr 2026 |
| 661 | Ventex Operating Corp. | Addison, TX 75001 | Oil & Gas Operator | Apr 2026 |
| 662 | Victorian Oil & Gas | Monahans, TX 79756 | Oil Operator | Apr 2026 |
| 663 | Vidonia Oil LLC | Plymouth MTNG, PA 19462 | Oil Operator | Apr 2026 |
| 664 | Viola Production Inc | Dallas, TX 75251 | Oil & Gas Operator | Apr 2026 |
| 665 | Vista Resources, Inc. (A) | Midland, TX 79701 | Oil & Gas Operator | Feb 2000 |
| 666 | Vital Energy, Inc. | Tulsa, OK 74120 | Oil & Gas Operator | Apr 2026 |
| 667 | Vogel, A. J., Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 1994 |
| 668 | Wadi Petroleum Inc | Houston, TX 77014 | Oil & Gas Operator | May 2018 |
| 669 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2026 |
| 670 | Wagner, Duer & Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1999 |
| 671 | Walbet | Monahans, TX 79756 | Oil & Gas Operator | Dec 1993 |
| 672 | Walbet, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Apr 2026 |
| 673 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Apr 2026 |
| 674 | Ward, Ted G. Jr. | Monahans, TX 79756 | Oil & Gas Operator | Nov 2000 |
| 675 | Waterbridge Texas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2026 |
| 676 | Watson Packer Employee Fund | Monahans, TX 79756 | Oil & Gas Operator | Apr 2026 |
| 677 | Way, Ralph L., Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 678 | Wellstar Corporation | Northglenn, CO 80233 | Oil & Gas Operator | Feb 2026 |
| 679 | Western Disposal Systems, Inc. | Corrales, NM 87048 | Oil Operator | Apr 2026 |
| 680 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 681 | Westover Production Co., LLC | Kermit, TX 79745 | Oil & Gas Operator | Apr 2026 |
| 682 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 683 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Feb 2026 |
| 684 | White Sail Resources LLC | Austin, TX 78731 | Oil Operator | Apr 2026 |
| 685 | White Wing Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2012 |
| 686 | White, Cecil | Monahans, TX 79756 | Oil & Gas Operator | Mar 2017 |
| 687 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 688 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 689 | Williams Oil Company | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 690 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2026 |
| 691 | Wilson Exploration Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 1996 |
| 692 | Wilson, WM. B. Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 693 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 694 | Wineridge Inc. | Austin, TX 78747 | Oil Operator | Apr 2026 |
| 695 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 696 | Wolf Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2021 |
| 697 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 698 | WPX Energy Permian, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 699 | WTG Exploration | Midland, TX 79705 | Oil & Gas Operator | Apr 2026 |
| 700 | WTG Exploration Inc | Midland, TX 79705 | Oil & Gas Operator | Dec 2023 |