| 501 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 502 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 503 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 504 | Southwest Gas Systems, Inc. | Spring, TX 77379 | Oil & Gas Operator | Apr 2024 |
| 505 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 506 | Spring Tree Management LC | Abilene, TX 79604 | Oil Operator | May 2013 |
| 507 | Squyres Oil Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 508 | Stamper Operating Co., Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2024 |
| 509 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Apr 2024 |
| 510 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 511 | Stasney Well Service, LLC | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 512 | Stasney, H. R. & Sons, LTD. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 513 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 514 | Stober Oil And Gas Services, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 515 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 516 | Stovall, Troy | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 517 | Strand, Carlton Oil | Stamford, TX 79553 | Oil & Gas Operator | May 1997 |
| 518 | Strawn Operating Co., L.L.C. | El Paso, TX 79912 | Oil Operator | Apr 2024 |
| 519 | Street, Spencer B., Jr. | Graham, TX 76450 | Oil & Gas Operator | Mar 1998 |
| 520 | Strike Too Oil | Albany, TX 76430 | Oil Operator | Apr 2024 |
| 521 | Stryker Energy Corp. | Mesquite, TX 75180 | Oil & Gas Operator | Apr 2024 |
| 522 | Subsea Operating Co. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 523 | Sundance Consulting Corp. | Abilene, TX 79605 | Oil & Gas Operator | Apr 2024 |
| 524 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 525 | Supreme Energy Company, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 526 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2024 |
| 527 | Synergy Operating Co., LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 528 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2024 |
| 529 | Tabor Creek Oil Company | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 530 | Talus Inc | Graham, TX 76450-1210 | Oil & Gas Operator | Feb 2017 |
| 531 | Tam2 Squared Energy Services,LLC | Ranger, TX 76470 | Oil Operator | Apr 2024 |
| 532 | Tankersley, D. C. | Abilene, TX 79601 | Oil & Gas Operator | Sep 2002 |
| 533 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 534 | Targo Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 535 | Taylor, Raymond C. Jr. | Woodway, TX 76712 | Oil & Gas Operator | Dec 2012 |
| 536 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2024 |
| 537 | Terry'S Roustabout Service, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Oct 2002 |
| 538 | Tetragon Investments, LLC | Abilene, TX 79604 | Oil Operator | Jul 2014 |
| 539 | Tex-Ann Oil & Gas Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 540 | Texas Pharchem Inc. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2019 |
| 541 | Texcal Resources, Inc. | Plano, TX 75094 | Oil & Gas Operator | Apr 1994 |
| 542 | Texoma Oil Tools, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 543 | Texowa, LLC | Roanoke, TX 76262 | Oil Operator | Apr 2024 |
| 544 | Texzona Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 1997 |
| 545 | Thornton, Michael D. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 1995 |
| 546 | Three P Operating Co.,GP, L.L.C. | Newcastle, TX 76372 | Oil & Gas Operator | Apr 2024 |
| 547 | Throckmorton Oil, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Mar 2008 |
| 548 | Thunderbolt Oil & Gas, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Feb 2004 |
| 549 | Tidmore, Ann | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 550 | Tiki Oil & Gas, LLC | Midland, TX 79704 | Oil Operator | Apr 2024 |
| 551 | Tollett Oil | Graham, TX 76450 | Oil Operator | Apr 2024 |
| 552 | Tom-Tom Operating, LLC | Dallas, TX 75209 | Oil Operator | Apr 2024 |
| 553 | Tracker Mineral | Clyde, TX 79510 | Oil & Gas Operator | Apr 2024 |
| 554 | Tracker Resource Dev III, LLC | Englewood, CO 80112 | Oil & Gas Operator | Jul 2021 |
| 555 | Trans Oil Marketing LLC | Abilene, TX 79602 | Oil Operator | Aug 2023 |
| 556 | Treco Oil Company | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 557 | Tres Piedras, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 1999 |
| 558 | Tri Sportsmen Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 559 | Tri-Tex Exploration LTD | Abilene, TX 79608 | Oil Operator | Apr 2019 |
| 560 | Triple Singleton, Inc. | Santa Fe, TX 77510 | Oil & Gas Operator | Dec 2020 |
| 561 | Trumter Petroleum Corporation | Fort Worth, TX 76185 | Oil & Gas Operator | Aug 1998 |
| 562 | TSW Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Jan 2016 |
| 563 | U.S. Sovereign Oil And Gas, Inc. | Dallas, TX 75355 | Oil & Gas Operator | Apr 2024 |
| 564 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2024 |
| 565 | United Operating, LLC *** | Midland, TX 79710 | Oil & Gas Operator | Apr 2024 |
| 566 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 567 | Valera Oil Company | Kingsland, TX 78639 | Oil & Gas Operator | Apr 2000 |
| 568 | Valley Petroleum Company | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 569 | Van Operating, LTD. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 570 | Vin Fisher Operating, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Apr 2024 |
| 571 | W.O.G., Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 572 | Waddell, Kent | Abilene, TX 79606 | Oil & Gas Operator | Nov 2010 |
| 573 | Walkabout Operating, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2024 |
| 574 | Waller, C.W. Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 575 | Waters Petroleum | Albany, TX 76430 | Oil & Gas Operator | Aug 2016 |
| 576 | Weaver Global Operating, LLC | Colleyville, TX 76034 | Oil Operator | Apr 2024 |
| 577 | Wells Oilfield Services, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 578 | West-States Energy, Inc. | Rimrock, AZ 86335 | Oil Operator | Apr 2024 |
| 579 | Western Reserves Corporation | Abilene, TX 79608 | Oil & Gas Operator | Jan 2008 |
| 580 | Western Sky Oil & Gas | Abilene, TX 79604 | Oil & Gas Operator | Aug 2003 |
| 581 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 582 | Westridge Oil & Gas Properties | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2024 |
| 583 | Westwood Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2013 |
| 584 | White, Oscar | Tuscola, TX 79562 | Oil & Gas Operator | Apr 2024 |
| 585 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 586 | Whitt Oil & Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 587 | Whitt, W. J. | Albany, TX 76430 | Oil & Gas Operator | Nov 1996 |
| 588 | Wilbanks, Bruce A. | Midland, TX 79701 | Oil & Gas Operator | Aug 1996 |
| 589 | Wilbrook Exploration, Inc. | Lingleville, TX 76461 | Oil & Gas Operator | Aug 2003 |
| 590 | Williams Deville Operating, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2024 |
| 591 | Wimsco, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 1994 |
| 592 | Winco Oil Inc. | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 593 | Winfrey Oil Co., Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2016 |
| 594 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 595 | WM Wild Wolf Production LLC | Albany, TX 76430 | Oil Operator | Apr 2024 |
| 596 | Xophi Energy, LLC | Arlington, TX 76006 | Oil & Gas Operator | Apr 2024 |
| 597 | Yeates, F. L. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 1997 |
| 598 | Yellow Rose Oil & Gas Oper. Inc. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2024 |
| 599 | Yellow Rose Oil & Gas Operating | Cisco, TX 76437 | Oil & Gas Operator | Jan 1996 |
| 600 | Young Marshall R Oil Co | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |