| 501 | Sun-Key Oil Co., Inc. | Dublin, TX 76446 | Oil & Gas Operator | Apr 2024 |
| 502 | Sunbelt Salvage | Eastland, TX 76448 | Oil & Gas Operator | Sep 1998 |
| 503 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 504 | Supreme Energy Company, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 505 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2024 |
| 506 | T & S Oil & Gas, LLC | Stephenville, TX 76401 | Gas Operator | Apr 2024 |
| 507 | T-Square Petroleum Co. | Rising Star, TX 76471 | Oil & Gas Operator | Apr 2024 |
| 508 | T. L. J. Incorporated | Big Lake, TX 76932 | Oil & Gas Operator | Dec 1998 |
| 509 | T.L.S. Oil Co. | Hawley, TX 79525 | Oil & Gas Operator | Apr 2024 |
| 510 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 511 | Tandem Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 512 | Targo Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 513 | Taylor Oil & Gas Serv | Snyder, TX 79549 | Oil Operator | Apr 2024 |
| 514 | TCF Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 515 | Teaco | Snyder, TX 79550 | Oil & Gas Operator | Jan 1998 |
| 516 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2024 |
| 517 | Terrick Resources | Midland, TX 79708 | Oil & Gas Operator | Jul 2005 |
| 518 | Tex-Am Petroleum Corp. | Eastland, TX 76448 | Oil & Gas Operator | Apr 2024 |
| 519 | Tex-Ann Oil & Gas Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 520 | Texas State Oil Co. | Irving, TX 75062 | Oil & Gas Operator | Mar 2017 |
| 521 | Texas United Geoproduction, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Apr 2024 |
| 522 | Texdon Operating | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2005 |
| 523 | Texokan Operating, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Apr 2024 |
| 524 | Texxol Operating Company, Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2024 |
| 525 | Thrifty Well Service | Rice, TX 75155 | Oil & Gas Operator | Jun 2009 |
| 526 | THT Covenant Holdings, LLC | Wichita Falls, TX 76307 | Oil Operator | Apr 2024 |
| 527 | Tidwell Production Company | Sonora, TX 76950 | Oil & Gas Operator | Apr 2024 |
| 528 | TK Operating | Cross Plains, TX 76443 | Oil & Gas Operator | Apr 2024 |
| 529 | Todd, J R Oil & Investments, Inc | Dallas, TX 75206 | Oil & Gas Operator | Jun 2002 |
| 530 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2024 |
| 531 | Torch Operating LLC | Fort Worth, TX 76135 | Oil & Gas Operator | Oct 2020 |
| 532 | Trace Energy Management Inc | Weatherford, TX 76086 | Oil & Gas Operator | Apr 2024 |
| 533 | Tracer Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 534 | Trans Oil Marketing LLC | Abilene, TX 79602 | Oil Operator | Aug 2023 |
| 535 | Transcontinental Shale L.L.C. | Austin, TX 78717 | Oil & Gas Operator | Feb 2016 |
| 536 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Apr 2024 |
| 537 | Tri Sportsmen Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 538 | Triple Singleton, Inc. | Santa Fe, TX 77510 | Oil & Gas Operator | Dec 2020 |
| 539 | Trumter Petroleum Corporation | Fort Worth, TX 76185 | Oil & Gas Operator | Aug 1998 |
| 540 | Tuckco Petroleum Corporation | Andrews, TX 79714 | Oil & Gas Operator | Apr 2024 |
| 541 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 542 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 543 | United Operating, LLC *** | Midland, TX 79710 | Oil & Gas Operator | Apr 2024 |
| 544 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 545 | Valley Petroleum Company | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 546 | Van Operating, LTD. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 547 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 548 | Vanguard Permian LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 549 | Verado Energy, Inc. | Allen, TX 75013 | Oil & Gas Operator | Apr 2024 |
| 550 | Viola Production Inc | Dallas, TX 75251 | Oil & Gas Operator | Apr 2024 |
| 551 | Vortt Exploration Company, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2019 |
| 552 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 553 | Watson Oil & Gas Co. | Gorman, TX 76454 | Oil & Gas Operator | Jan 2002 |
| 554 | Watson Oil & Gas, Inc. | Gorman, TX 76454 | Oil & Gas Operator | Apr 2024 |
| 555 | Weakland Investments, Inc. | Denver, CO 80215 | Oil & Gas Operator | Apr 2024 |
| 556 | Wehunt Oil Company, Inc. | Dallas, TX 75376 | Oil & Gas Operator | Nov 2002 |
| 557 | Wejco, Inc. | Rising Star, TX 76471 | Oil & Gas Operator | Apr 2024 |
| 558 | Welcome Well Serv. & Boykin Bros | Abilene, TX 79604 | Oil & Gas Operator | Apr 1995 |
| 559 | Wells Oilfield Services, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 560 | Wes-Tex Drilling Company | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 561 | West Texas Royalties, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 562 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 563 | Western Gulf Oil & Gas Inc. | Dallas, TX 75360 | Oil & Gas Operator | Jul 2000 |
| 564 | Western Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 565 | Wheat, Buck Resources, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2009 |
| 566 | Whiteside, Robert | Comanche, TX 76442 | Oil & Gas Operator | May 1998 |
| 567 | Whitt, W. J. | Albany, TX 76430 | Oil & Gas Operator | Nov 1996 |
| 568 | Wilbanks, Bruce A. | Midland, TX 79701 | Oil & Gas Operator | Aug 1996 |
| 569 | Wilbrook Exploration, Inc. | Lingleville, TX 76461 | Oil & Gas Operator | Aug 2003 |
| 570 | Wilson Well Service Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Apr 2024 |
| 571 | Wilson, Jerry L. | Ranger, TX 76470 | Oil & Gas Operator | Apr 2024 |
| 572 | Wilson, Olan Max | Cisco, TX 76437 | Oil & Gas Operator | Apr 2024 |
| 573 | Wilson, WM. B. Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 574 | Window Operating Co., The | Coleman, TX 76834 | Oil & Gas Operator | Apr 2024 |
| 575 | Wineridge Inc. | Austin, TX 78747 | Oil Operator | Apr 2024 |
| 576 | Wise Production Company | Bowie, TX 76230 | Oil & Gas Operator | Apr 2024 |
| 577 | WJC, Inc. | Post, TX 79356 | Oil & Gas Operator | Apr 2024 |
| 578 | World Producers, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1994 |
| 579 | Wright Oil And Gas, LLC | Benbrook, TX 76126 | Oil & Gas Operator | Apr 2024 |
| 580 | Xeric Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Jul 1997 |
| 581 | Xplore Operating, LLC | Arlington, TX 76001 | Oil & Gas Operator | Apr 2024 |
| 582 | Yellow Rose Oil & Gas Oper. Inc. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2024 |
| 583 | Yellow Rose Oil & Gas Operating | Cisco, TX 76437 | Oil & Gas Operator | Jan 1996 |
| 584 | Young, L. M. | Brownwood, TX 76804 | Oil & Gas Operator | Aug 2003 |