| 401 | Three J Operating Company, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2024 |
| 402 | Three J'S Petroleum, Inc. | Lubbock, TX 79452 | Oil & Gas Operator | Apr 2024 |
| 403 | Three Mile Joint Venture | Houston, TX 77027 | Oil & Gas Operator | Jul 1995 |
| 404 | Three P Operating Co.,GP, L.L.C. | Newcastle, TX 76372 | Oil & Gas Operator | Apr 2024 |
| 405 | Three P Operating Company | Newcastle, TX 76372 | Oil & Gas Operator | Nov 2007 |
| 406 | Three R Oil Company | Post, TX 79356 | Oil & Gas Operator | Apr 2024 |
| 407 | Three Rivers Oper Co III LLC | Austin, TX 78735 | Oil & Gas Operator | Nov 2017 |
| 408 | Three Rivers Operating Co II LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 409 | Three Rivers Operating Co LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 410 | Three Sisters Petroleum, Inc. | Oil City, LA 71061 | Oil & Gas Operator | Jan 2024 |
| 411 | Three Span Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2024 |
| 412 | Three Summits Operating LLC | Grapevine, TX 76051 | Oil & Gas Operator | Apr 2024 |
| 413 | Three-B Oil Company, The | Monahans, TX 79756 | Oil & Gas Operator | Apr 2024 |
| 414 | Three-C Oil And Gas | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 415 | Three-C Production Company | Temple, TX 76502 | Oil Operator | Apr 2024 |
| 416 | Threeway Drilling Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 417 | Thresher Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Apr 2024 |
| 418 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 419 | Threshold Exploration, Inc. | College Sta, TX 77842 | Oil & Gas Operator | Oct 2015 |
| 420 | Thrifty Well Service | Rice, TX 75155 | Oil & Gas Operator | Jun 2009 |
| 421 | Throckmorton Oil, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Mar 2008 |
| 422 | Throne Delaware Resources, LLC | McKinney, TX 75072 | Oil & Gas Operator | Dec 2021 |
| 423 | Throne Petroleum Resources LLC | Houston, TX 77006 | Oil & Gas Operator | Aug 2021 |
| 424 | THT Covenant Holdings, LLC | Wichita Falls, TX 76307 | Oil Operator | Apr 2024 |
| 425 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | Jan 2024 |
| 426 | Thunder Resources LLC | Graham, TX 76450 | Oil Operator | Apr 2024 |
| 427 | Thunderbird (Texas) Resources LP | Edmond, OK 73025 | Oil & Gas Operator | Apr 2019 |
| 428 | Thunderbird Drilling, Inc. | Wichita, KS 67207 | Oil Operator | Oct 2008 |
| 429 | Thunderbird Energy, Inc. | Norman, OK 73069 | Oil & Gas Operator | Apr 2024 |
| 430 | Thunderbird Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 431 | Thunderbolt Oil & Gas, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Feb 2004 |
| 432 | Thunderbolt Petroleum Co. LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2011 |
| 433 | Thurston Texas Operating Co LLC | Dallas, TX 75219 | Oil Operator | Apr 2024 |
| 434 | Tiburon Oil & Gas, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2000 |
| 435 | Tidal Petroleum, Inc. | Schertz, TX 78154 | Oil & Gas Operator | Apr 2024 |
| 436 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 437 | Tidelands Oil Corporation | Crystal City, TX 78839 | Oil & Gas Operator | Aug 2003 |
| 438 | Tidemark Exploration Inc | Tulsa, OK 74120 | Oil & Gas Operator | Apr 2019 |
| 439 | Tidemark Petroleum, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2002 |
| 440 | Tidewater Minerals Corporation | Orange Grove, TX 78372 | Oil & Gas Operator | Apr 2024 |
| 441 | Tidewater Resources Corporation | Memphis, TN 38138 | Gas Operator | Apr 2024 |
| 442 | Tidlow | Santa Fe, NM 87508 | Oil & Gas Operator | Dec 2007 |
| 443 | Tidmore, Ann | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 444 | Tidwell Production Company | Sonora, TX 76950 | Oil & Gas Operator | Apr 2024 |
| 445 | Tierra Mineral Development, L.C. | Dallas, TX 75244 | Oil & Gas Operator | Oct 1994 |
| 446 | Tiger Resources, L.L.C. | Houston, TX 77070 | Oil & Gas Operator | Feb 2004 |
| 447 | Tigrett, Robert L. Oil & Gas Co. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2013 |
| 448 | Tiki Oil & Gas, LLC | Midland, TX 79704 | Oil Operator | Apr 2024 |
| 449 | Tilley Oil & Gas, Inc. | Oklahoma City, OK 73172 | Oil & Gas Operator | Apr 2024 |
| 450 | Tillman, Jack Equipment Co. | Holliday, TX 76366 | Oil & Gas Operator | Sep 2004 |
| 451 | Tilmon Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Sep 2012 |
| 452 | Timber Creek Operating LLC | Granbury, TX 76049 | Oil & Gas Operator | Apr 2024 |
| 453 | Timberwolf Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Apr 2024 |
| 454 | Timn Oil Co. | Lubbock, TX 79424 | Oil & Gas Operator | Aug 1997 |
| 455 | Tindle Petroleum LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 456 | Tipco Operating Co. | Marshall, TX 75671 | Oil & Gas Operator | Apr 2024 |
| 457 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 458 | Titan Allen Dome LLC | Houston, TX 77056 | Oil Operator | Feb 2015 |
| 459 | Titan Energy Operating LLC | Houston, TX 77056 | Oil Operator | Jan 2016 |
| 460 | Titan Energy, Inc. | Austin, TX 78703 | Oil & Gas Operator | Apr 2024 |
| 461 | Titan Exploration LLC | Luling, TX 78648 | Oil & Gas Operator | Feb 2024 |
| 462 | Titan Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2012 |
| 463 | Titan Resources I, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2000 |
| 464 | Titan Rock E&P, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2024 |
| 465 | Titus Oil & Gas Production, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2022 |
| 466 | Tiza Energy, Inc. | Austin, TX 78715 | Oil & Gas Operator | Apr 2024 |
| 467 | Tiza Operating Company | Austin, TX 78716 | Oil & Gas Operator | Jan 2000 |
| 468 | TJ Oil Company | Borger, TX 79008 | Oil & Gas Operator | Apr 2024 |
| 469 | TK Drilling Corp. | Tulsa, OK 74133 | Oil & Gas Operator | Jan 2024 |
| 470 | TK Operating | Cross Plains, TX 76443 | Oil & Gas Operator | Apr 2024 |
| 471 | TKL Oil Properties Inc | Konawa, OK 74849 | Oil & Gas Operator | Dec 2023 |
| 472 | TKP Petroleum, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | Apr 2024 |
| 473 | TLH Production LLC | Abilene, TX 79602 | Oil & Gas Operator | Apr 2024 |
| 474 | TMBR/Sharp Drilling, Inc. | Midland, TX 79703 | Oil & Gas Operator | Feb 2004 |
| 475 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Apr 2024 |
| 476 | TNC Energy, LLC | Lubbock, TX 79401 | Oil & Gas Operator | Nov 2016 |
| 477 | TNCH, LLC | Colorado City, TX 79512 | Oil Operator | Apr 2024 |
| 478 | TNR Petroleum, Inc. | Austin, TX 78747 | Oil & Gas Operator | Sep 1999 |
| 479 | TNT Energy Inc. | Brownwood, TX 76801 | Oil & Gas Operator | May 2013 |
| 480 | TNT Oil Co. | Hamlin, TX 79520 | Oil & Gas Operator | Apr 2024 |
| 481 | TNT Petroleum Company, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Feb 1996 |
| 482 | Toc Energy Resources, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2024 |
| 483 | Todd, J R Oil & Investments, Inc | Dallas, TX 75206 | Oil & Gas Operator | Jun 2002 |
| 484 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2024 |
| 485 | Tola Production Company | Dallas, TX 75367 | Oil & Gas Operator | Apr 2024 |
| 486 | Tollett Oil | Graham, TX 76450 | Oil Operator | Apr 2024 |
| 487 | Tom Coble Oil & Gas LP | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2024 |
| 488 | Tom E. Johnson Exploration LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2019 |
| 489 | Tom Operating And Minerals LLC | Andrews, TX 79714 | Gas Operator | Apr 2024 |
| 490 | Tom-Tom Operating, LLC | Dallas, TX 75209 | Oil Operator | Apr 2024 |
| 491 | Tomar Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2001 |
| 492 | Tomco Oil & Gas Inc. | Comanche, TX 76442 | Oil & Gas Operator | Apr 2024 |
| 493 | Tomel Production, LLC | Dallas, TX 75360 | Oil & Gas Operator | Apr 2024 |
| 494 | Tomlinson, John Oil Operator | Batson, TX 77519 | Oil & Gas Operator | Mar 2008 |
| 495 | Tomlinson, Thomas K. Inc. | Port Lavaca, TX 77979 | Oil & Gas Operator | Jul 2003 |
| 496 | Tompkins, Kevin D. | Kilgore, TX 75663 | Oil Operator | Apr 2024 |
| 497 | Tomsha LLC | Bryson, TX 76427 | Oil Operator | Apr 2024 |
| 498 | Toney, W.L. | Borger, TX 79007 | Oil & Gas Operator | Oct 2012 |
| 499 | Tong Petrotech Inc. | Houston, TX 77079 | Oil & Gas Operator | Apr 2024 |
| 500 | Tonk Creek Oil Company | Aspermont, TX 79502 | Oil & Gas Operator | Apr 2024 |