| 501 | Sea Sand Oil Company | Fort Worth, TX 76185 | Oil & Gas Operator | Jun 1995 |
| 502 | Sed Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 503 | Seguro Oil And Gas, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2024 |
| 504 | SFM Holdings, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 1995 |
| 505 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | May 2024 |
| 506 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Jan 2024 |
| 507 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 508 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2024 |
| 509 | Shinnery Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 510 | Siana Oil & Gas | Pearland, TX 77581 | Oil & Gas Operator | May 2024 |
| 511 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | May 2024 |
| 512 | Silver Cross Energy Partners LLC | Richmond, TX 77469 | Oil & Gas Operator | May 2024 |
| 513 | Simata Energy, LLC | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 514 | Simmons, L.B. Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 2000 |
| 515 | Simpson Bros. Oil Co. | Odessa, TX 79760 | Oil & Gas Operator | Jan 2001 |
| 516 | Simpson Oil Company | Odessa, TX 79760 | Oil & Gas Operator | Oct 2004 |
| 517 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2024 |
| 518 | Smith, John A. | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 519 | Sol Oil Co., L.C. | Crane, TX 79731 | Oil Operator | May 2024 |
| 520 | Southland Royalty Co.-Midland | Midland, TX 79702 | Oil & Gas Operator | Mar 1996 |
| 521 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 522 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 523 | Southwest-Operating | Penwell, TX 79776 | Oil & Gas Operator | May 2024 |
| 524 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 525 | Space Production Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2024 |
| 526 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | May 2024 |
| 527 | Stanolind Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Apr 2008 |
| 528 | Stanolind Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2021 |
| 529 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 530 | Stephens, Mickie L. | MC Camey, TX 79752 | Oil & Gas Operator | Aug 1998 |
| 531 | Stevens & Tull, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 532 | Stout Energy Inc. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 533 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 534 | Stronghold Energy II Oper, LLC | Midland, TX 79702 | Oil & Gas Operator | Aug 2022 |
| 535 | Summit Petroleum LLC | Midland, TX 79705 | Oil & Gas Operator | May 2024 |
| 536 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | May 2024 |
| 537 | Swanson, Tom | Electra, TX 76360 | Oil & Gas Operator | Oct 2004 |
| 538 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | May 2024 |
| 539 | Talus Inc | Graham, TX 76450-1210 | Oil & Gas Operator | Feb 2017 |
| 540 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 541 | Taurus Petroleum, Inc. (A) | San Antonio, TX 78259 | Oil & Gas Operator | Jul 1996 |
| 542 | Taylor, Ben J. Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Feb 2022 |
| 543 | Taylor-McIlhenny Oper. Co., Inc. | Lewisville, TX 75029 | Oil & Gas Operator | Jan 1996 |
| 544 | TD Oil & Gas LLC | Duncan, OK 73533-1851 | Oil Operator | Apr 2023 |
| 545 | Tejones Operating Corporation | San Antonio, TX 78217 | Oil & Gas Operator | May 2024 |
| 546 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | May 2024 |
| 547 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | May 2024 |
| 548 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 549 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | May 2024 |
| 550 | Texan Petroleum Corporation | Dallas, TX 75204 | Oil & Gas Operator | Oct 2004 |
| 551 | Texas Consolidated Pet. Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | May 2024 |
| 552 | Texas Secondary Oil Corporation | Devine, TX 78016 | Oil & Gas Operator | May 2024 |
| 553 | Texas Vanguard Oil Company | Austin, TX 78720 | Oil & Gas Operator | Jan 2014 |
| 554 | Texland-Rector & Schumacher | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2000 |
| 555 | Thompson, J. Cleo | Dallas, TX 75201 | Oil & Gas Operator | May 2024 |
| 556 | Three Span Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 557 | Three-B Oil Company, The | Monahans, TX 79756 | Oil & Gas Operator | May 2024 |
| 558 | Titan Resources I, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2000 |
| 559 | TMBR/Sharp Drilling, Inc. | Midland, TX 79703 | Oil & Gas Operator | Feb 2004 |
| 560 | Toc Energy Resources, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | May 2024 |
| 561 | Tola Production Company | Dallas, TX 75367 | Oil & Gas Operator | May 2024 |
| 562 | Topat Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Sep 2017 |
| 563 | Torch Energy Services, Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 564 | Trans Oil Marketing LLC | Abilene, TX 79602 | Oil Operator | Aug 2023 |
| 565 | Tres Roughneckas WTX LLC | Houston, TX 77009 | Oil Operator | May 2024 |
| 566 | Triesco, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1996 |
| 567 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | May 2024 |
| 568 | Triple "N" Services, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 569 | Tripp & Sons, LLC | Odessa, TX 79768 | Oil & Gas Operator | May 2024 |
| 570 | Trivista Operating LLC | Giddings, TX 78942 | Oil & Gas Operator | May 2024 |
| 571 | Tumbleweed Energy Limited | Midland, TX 79704 | Oil & Gas Operator | Dec 2022 |
| 572 | TX Heat Of The Permian Basin Inc | Odessa, TX 79768 | Oil & Gas Operator | Dec 2021 |
| 573 | U S Energy Corp. Of Amer. Inc. | Ranger, TX 76470 | Oil & Gas Operator | May 2024 |
| 574 | Uhc Petroleum Corporation | Rocksprings, TX 78880 | Oil & Gas Operator | May 2024 |
| 575 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 576 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 577 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | May 2024 |
| 578 | United Company | Lubbock, TX 79408 | Oil & Gas Operator | Jun 1995 |
| 579 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 580 | V-F Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 581 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 582 | Vanguard Permian LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 583 | Vaquero Operating | FT Stockton, TX 79735 | Oil & Gas Operator | May 2024 |
| 584 | Venus Exploration, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2013 |
| 585 | Venus Oil Company | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2002 |
| 586 | Viola Prod., Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2024 |
| 587 | Vista Resources, Inc. (A) | Midland, TX 79701 | Oil & Gas Operator | Feb 2000 |
| 588 | Vital Energy, Inc. | Tulsa, OK 74120 | Oil & Gas Operator | May 2024 |
| 589 | Walbet | Monahans, TX 79756 | Oil & Gas Operator | Dec 1993 |
| 590 | Walbet, Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2024 |
| 591 | Walker, Kent | Midland, TX 79704 | Oil & Gas Operator | Jun 2004 |
| 592 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | May 2024 |
| 593 | Watson Packer Employee Fund | Monahans, TX 79756 | Oil & Gas Operator | May 2024 |
| 594 | WCWB Energy, LLC | Midland, TX 79701 | Oil Operator | Sep 2015 |
| 595 | West Bay Exploration Company | Muenster, TX 76252 | Oil & Gas Operator | Feb 2024 |
| 596 | Westar Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 597 | Western DRLG. Co. | Longview, TX 75604 | Oil & Gas Operator | Nov 1996 |
| 598 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 599 | Westport Oil & Gas Company LP | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2007 |
| 600 | Wheeler Operating Corporation | Fort Worth, TX 76101 | Oil & Gas Operator | May 2024 |