| 501 | Rust Oil Corp. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2025 |
| 502 | Ruth Oil Co, LLC | Eunice, NM 88231 | Oil Operator | Mar 2015 |
| 503 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 504 | Saber Oil & Gas Ventures, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 505 | Sabre Op Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2025 |
| 506 | Saga Petroleum Limited Liability Co. | Midland, TX 79701 | Oil & Gas Operator | Apr 2008 |
| 507 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Apr 2025 |
| 508 | Saguaro Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 509 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 510 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 511 | Samuel Dale Hughes Dba Hughes Drilling Co. | Artesia, NM 88211026 | Oil Operator | Feb 2025 |
| 512 | San Marco Petroleum Inc | Denver, CO 80293 | Oil & Gas Operator | Mar 2025 |
| 513 | Sandel Operating Company | Huntsville, TX 77340 | Oil & Gas Operator | Apr 2025 |
| 514 | Sanders & Smith, L.C. | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2004 |
| 515 | Sandlott Energy (Jackie Brewer Dba) | Lovington, NM 88260 | Oil & Gas Operator | Dec 2024 |
| 516 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Apr 2025 |
| 517 | Santa Fe Energy Operating Partners L.P. | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 518 | Santa Fe Exploration Company | Lubbock, TX 79408 | Oil & Gas Operator | Nov 1997 |
| 519 | Santo Petroleum LLC | Artesia, NM 88211 | Oil & Gas Operator | Sep 2024 |
| 520 | SBKF, LLC | Artesia, NM 88211 | Oil & Gas Operator | Feb 2025 |
| 521 | Scott Branson | Carlsbad, NM 88221 | Oil & Gas Operator | Oct 2017 |
| 522 | SDG Resources L.P. | Montrose, CO 81402 | Oil & Gas Operator | May 2006 |
| 523 | SDX Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 524 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 525 | Seguro Oil And Gas, LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2024 |
| 526 | Sellers&Fulton Oil LLC | Artesia, NM 88210 | Oil & Gas Operator | Jun 2021 |
| 527 | Sensor Oil & Gas Inc | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 528 | Shackelford Oil Co | Midland, TX 79707 | Oil & Gas Operator | Feb 2025 |
| 529 | Shahara Oil LLC | Carlsbad, NM 88220 | Oil & Gas Operator | Oct 2000 |
| 530 | Shifflett Operating Company | Snyder, TX 79550 | Oil & Gas Operator | Apr 2025 |
| 531 | Shinnery Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 532 | Sidney Lanier | Midland, TX BADADDR | Oil & Gas Operator | Jan 1996 |
| 533 | Siete Oil And Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 534 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Jan 2025 |
| 535 | Silverback Operating II, LLC | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2025 |
| 536 | Slayton Resources Inc | Roswell, NM 88202 | Oil & Gas Operator | Feb 2025 |
| 537 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2025 |
| 538 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 539 | Smith & Marrs Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2021 |
| 540 | Snow Oil & Gas Inc. | Andrews, TX 79714 | Oil & Gas Operator | Apr 2025 |
| 541 | Snow Operating Co., Inc. | Haltom City, TX 76117 | Oil & Gas Operator | Feb 2024 |
| 542 | Socorro Pet Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 1995 |
| 543 | Sogo III LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2017 |
| 544 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 2025 |
| 545 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 546 | Southeastern Petroleum Inc | Roswell, NM BAD ADDR | Oil & Gas Operator | Dec 1995 |
| 547 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 548 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 549 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 550 | Southwestern Inc | Hobbs, NM 88240 | Oil Operator | Oct 2009 |
| 551 | SPC Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2024 |
| 552 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2025 |
| 553 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Apr 2025 |
| 554 | Spenergy Corp. | Midland, TX 79701 | Oil & Gas Operator | Dec 1999 |
| 555 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2025 |
| 556 | Spur Energy Partners LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2025 |
| 557 | Stanolind Operating LLC Dba Stanolind NM LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2014 |
| 558 | Stanolind Permian LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 559 | Stephens & Johnson Op Co | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2025 |
| 560 | Strata Production Co | Roswell, NM 882021030 | Oil & Gas Operator | Feb 2025 |
| 561 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Apr 2025 |
| 562 | Summers Exploration Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2002 |
| 563 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Apr 2025 |
| 564 | Sylvite Corp | Tulsa, OK 741363908 | Oil & Gas Operator | Dec 2000 |
| 565 | Synergex Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Jan 2025 |
| 566 | Synergy Resources | Artesia, NM 88210 | Oil & Gas Operator | Jan 2015 |
| 567 | Tahoe Energy, Inc. | Midland, TX 79703 | Oil & Gas Operator | Jul 1996 |
| 568 | Tandem Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 569 | Tap Rock Operating, LLC | Golden, CO 80401 | Oil & Gas Operator | Apr 2025 |
| 570 | Tarco Energy, LC | Lubbock, TX 79423 | Oil & Gas Operator | Jan 2025 |
| 571 | Tascosa Energy Partners, L.L.C | Midland, TX 79701 | Oil & Gas Operator | Feb 2025 |
| 572 | Tbi Exploration Inc | Englewood, CO 801556525 | Oil & Gas Operator | Jun 2011 |
| 573 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | Apr 2025 |
| 574 | Tempo Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 575 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Feb 2025 |
| 576 | Texas Independent Exploration LP | Houston, TX 77024 | Oil & Gas Operator | Mar 2017 |
| 577 | Texas Reexploration Operating LC | Fredericksbrg, TX 78624 | Oil & Gas Operator | Apr 2025 |
| 578 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Apr 2025 |
| 579 | Three Rivers Operating Co LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 580 | Three Span Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 581 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 582 | Thunderbolt Petroleum, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2013 |
| 583 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 584 | Tipton Oil & Gas Acquisitions, Inc. | Irving, TX 75038 | Oil & Gas Operator | Sep 2010 |
| 585 | Titan Resources I, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2000 |
| 586 | Titus Oil & Gas Production, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2022 |
| 587 | TMBR/Sharp Drilling, Inc. | Midland, TX 79703 | Oil & Gas Operator | Feb 2004 |
| 588 | Tom Boyd Drilling Co Inc | Roswell, NM 882021375 | Oil & Gas Operator | Jan 1996 |
| 589 | Tom Brown Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 590 | Tom R Cone | Hobbs, NM 88240 | Oil Operator | Oct 2009 |
| 591 | Tomsco Energy | Artesia, NM 88210 | Oil & Gas Operator | Mar 1996 |
| 592 | Topat Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Sep 2017 |
| 593 | Torch Energy Services, Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 594 | Trek Operating, LLC | Tulsa, OK 741520098 | Oil & Gas Operator | Mar 2021 |
| 595 | Trilogy Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2025 |
| 596 | Trinity River Energy, LLC | Houston, TX 77094 | Oil & Gas Operator | Aug 2015 |
| 597 | Trinity University & Closuit | Loco Hills, NM 88255 | Oil & Gas Operator | Dec 2002 |
| 598 | Tritex Resources, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2009 |
| 599 | U.S. Energy Development Corp | Fort Worth, TX 76164 | Oil & Gas Operator | Apr 2025 |
| 600 | Uhc New Mexico Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2007 |