| 401 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 402 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 403 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 404 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 405 | PPC Operating Company LLC | Houston, TX 77279 | Oil & Gas Operator | Jul 2019 |
| 406 | Prasad, Hari Production Co. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 407 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 408 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Apr 2025 |
| 409 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |
| 410 | Purvis Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 411 | Purvis, J. H. | Midland, TX 79702 | Oil & Gas Operator | Dec 1994 |
| 412 | Q Natural Resources, LLC | Jones, OK 73049 | Oil & Gas Operator | Jul 2025 |
| 413 | QP, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 414 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Apr 2025 |
| 415 | Quay Valley, Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2007 |
| 416 | Quien Sabe Operating, LLC | Sundown, TX 79372 | Oil & Gas Operator | Nov 2023 |
| 417 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 418 | Radtke, D.E. & Associates, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2004 |
| 419 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 420 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 421 | Rasmussen, Tom | San Angelo, TX 76904 | Oil & Gas Operator | Jul 2025 |
| 422 | Rattler Midstream Operating LLC | Midland, TX 79701 | Oil Operator | Jul 2025 |
| 423 | Raw Oil & Gas, Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Jul 2025 |
| 424 | RBJ & Associates, LP | Midland, TX 79707 | Oil Operator | Jan 2020 |
| 425 | Read & Stevens, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jul 2023 |
| 426 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 427 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Jul 2025 |
| 428 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 429 | Regions Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 430 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 431 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 432 | Renegade Operating Company, LLC | Abilene, TX 79608 | Oil Operator | Oct 2006 |
| 433 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Jul 2025 |
| 434 | Resolute Natural Res. Co., LLC | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 435 | Reunion Energy Company | Houston, TX 77056 | Oil & Gas Operator | May 1996 |
| 436 | Reverence Operating LLC | Odessa, TX 79768 | Oil & Gas Operator | Jul 2025 |
| 437 | Riata Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2008 |
| 438 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Jul 2025 |
| 439 | RMB Operating LLC | Lubbock, TX 79493 | Oil & Gas Operator | Jul 2025 |
| 440 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Jul 2025 |
| 441 | Robinson Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Aug 2012 |
| 442 | Roca Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 443 | Roca Resource Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 444 | Rock Fish Operating LLC | McKinney, TX 75070 | Oil & Gas Operator | Jul 2025 |
| 445 | Roff Operating Company LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 446 | Rogers, S. K. Oil, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Jul 2025 |
| 447 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 448 | Roy Jackson Energy Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 449 | RSP Permian, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2018 |
| 450 | Rusk Co. Well Service Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 451 | S2 Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2023 |
| 452 | Saber Oil & Gas Ventures, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 453 | Saber Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2008 |
| 454 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Jul 2025 |
| 455 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Jul 2025 |
| 456 | Sagebrush Oilandgas Company,LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2010 |
| 457 | Saguaro Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 458 | Sahara Operating Company | Midland, TX 79704 | Oil & Gas Operator | Jul 2025 |
| 459 | Salt Creek Production, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Jul 2025 |
| 460 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 461 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 462 | Satanta Oil Company | Midland, TX 79704 | Oil & Gas Operator | Jul 2025 |
| 463 | Schlagal, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2016 |
| 464 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | Jul 2025 |
| 465 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 466 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 467 | SDX Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 468 | Seaboard Oil Company | Midland, TX 79710 | Oil & Gas Operator | Mar 2008 |
| 469 | Seaboard Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 470 | Sedona Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Jul 2025 |
| 471 | Seguro Oil And Gas, LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2024 |
| 472 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | Jul 2025 |
| 473 | Sem Operating Company LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2025 |
| 474 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Jul 2025 |
| 475 | Siana Oil & Gas | Conroe, TX 77305 | Oil & Gas Operator | Jul 2025 |
| 476 | Siete Oil And Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 477 | Simata Energy | Midland, TX 79708 | Oil & Gas Operator | Jul 2025 |
| 478 | Sinclair Exploration Company | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 479 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Jul 2025 |
| 480 | Slape Oil Company, Inc. | Houston, TX 77064 | Oil & Gas Operator | Jun 2011 |
| 481 | Slaughter J M Oil Company | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2001 |
| 482 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Jul 2025 |
| 483 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 484 | Smith & Marrs Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2021 |
| 485 | Smith Energy Operating Company | Lubbock, TX 79423 | Oil & Gas Operator | Jul 2025 |
| 486 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 487 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 488 | Socorro Exploration, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | Jul 2025 |
| 489 | Sogo III LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2017 |
| 490 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 491 | Sonat Exploration Co. - Midland | Houston, TX 77251 | Oil & Gas Operator | Mar 1999 |
| 492 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 493 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 494 | Spi Operations LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2013 |
| 495 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Jul 2025 |
| 496 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Jul 2025 |
| 497 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 498 | Stanolind Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2021 |
| 499 | Stanolind Production LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2020 |
| 500 | STB Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2008 |