| 401 | Power, Scott | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 1997 |
| 402 | Prensorus Energy, LLC | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 403 | Prentice Petroleum, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Sep 1994 |
| 404 | Presley Prod Investments, LLC | Abilene, TX 79604 | Oil Operator | Apr 2024 |
| 405 | Principal Oil Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2002 |
| 406 | Privateer Energy LLC | Warren, NJ 07059 | Oil Operator | Apr 2024 |
| 407 | Proco Operating Co., Inc. | Graford, TX 76449 | Oil & Gas Operator | Apr 2024 |
| 408 | Production Management Associates | Plano, TX 75075 | Oil & Gas Operator | Apr 2024 |
| 409 | Production Operators Of TX, LLC | Abilene, TX 79605 | Oil & Gas Operator | Apr 2024 |
| 410 | Progas Properties, Inc. | New Braunfels, TX 78132 | Oil & Gas Operator | Apr 2024 |
| 411 | Putnam Oil Production | Abilene, TX 79603 | Oil & Gas Operator | Jun 2002 |
| 412 | PV Oil Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 413 | Pyramid Production Co. | Abilene, TX 79608 | Oil & Gas Operator | Jun 1994 |
| 414 | Quail Operating, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 415 | Quail Well Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 416 | Quality Operating, Inc. | Dallas, TX 75367 | Oil & Gas Operator | Aug 2005 |
| 417 | Quantum Investments | Lubbock, TX 79424 | Oil Operator | Apr 2024 |
| 418 | Quest Petroleum, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Apr 2024 |
| 419 | Quisto Energy Corp. | Kerrville, TX 78029 | Oil & Gas Operator | Jan 1998 |
| 420 | R & P Operating | Tuscola, TX 79562 | Oil & Gas Operator | Jun 1997 |
| 421 | Rampart Petroleum, Incorporated | Buffalo Gap, TX 79508 | Oil & Gas Operator | Jan 2009 |
| 422 | Rasbury | Clyde, TX 79510 | Oil Operator | Apr 2024 |
| 423 | Ratts, Robert V. Inc. | Bedford, TX 76021 | Oil & Gas Operator | Aug 2003 |
| 424 | Rayco Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 425 | Raymond, WM. C. | Rockdale, TX 76567 | Oil & Gas Operator | Apr 2024 |
| 426 | Red-Tex Petroleum, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Aug 2003 |
| 427 | Redbud E & P, Inc. | Spring, TX 77379 | Oil & Gas Operator | Apr 2024 |
| 428 | Redmon Oil Company, Inc., The | Plano, TX 75023 | Oil & Gas Operator | Apr 2024 |
| 429 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 430 | Regions Energy LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2016 |
| 431 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Apr 2024 |
| 432 | Rendova Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2002 |
| 433 | Renegade Operating Company, LLC | Abilene, TX 79608 | Oil Operator | Oct 2006 |
| 434 | RHB Exploration & Production,LLC | Grapevine, TX 76099 | Oil & Gas Operator | Apr 2024 |
| 435 | Rhodes Drilling Company | Abilene, TX 79608 | Oil & Gas Operator | Sep 2000 |
| 436 | Richardson Resources Inc | Brownwood, TX 76801 | Oil & Gas Operator | Apr 2024 |
| 437 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 438 | Richmond Drilling Company | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 439 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2024 |
| 440 | Riptide Energy LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2024 |
| 441 | RMB Operating LLC | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 442 | Robertson Resources, Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2024 |
| 443 | Robertson, French M. Oil Co. | Abilene, TX 79608 | Oil & Gas Operator | Mar 1995 |
| 444 | Roco Petroleum, Incorporated | Abilene, TX 79605 | Oil & Gas Operator | Apr 2024 |
| 445 | Ross Engineering, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 446 | Rover Petroleum Operating, LLC | Plano, TX 75075 | Oil & Gas Operator | Apr 2024 |
| 447 | Royal Texas Petroleum | Lago VIsta, TX 78645 | Oil & Gas Operator | Apr 2024 |
| 448 | Rozzlle Operating Company, LLC | Blackwell, TX 79506 | Oil & Gas Operator | Apr 2024 |
| 449 | Rust Oil Corp. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2024 |
| 450 | S & H Resources | Abilene, TX 79605 | Oil & Gas Operator | Apr 2024 |
| 451 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 452 | S & R Operating | Merkel, TX 79536 | Oil & Gas Operator | Mar 2008 |
| 453 | S M K Energy Corporation | Corpus Chrsti, TX 78475 | Oil & Gas Operator | Apr 2024 |
| 454 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 455 | S.U.E. Company | Abilene, TX 79604 | Oil Operator | Jan 1998 |
| 456 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Apr 2024 |
| 457 | Salida Exploration, LLC | Abilene, TX 79603 | Oil & Gas Operator | Apr 2024 |
| 458 | Saling Oil Co. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2002 |
| 459 | Salty Lime Energy, LLC | Ovalo, TX 79541 | Oil Operator | Apr 2024 |
| 460 | Sanders Energy LLC | Aledo, TX 76008 | Oil & Gas Operator | Apr 2024 |
| 461 | Schkade Bros. Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 2021 |
| 462 | Schkade Production Co. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2020 |
| 463 | Scott Operating, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 464 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 465 | Seago Operating Co., L.L.C. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2011 |
| 466 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 467 | Ser E&P, Inc. | McKinney, TX 75069 | Oil & Gas Operator | Apr 2024 |
| 468 | Seven Cross Operating, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Apr 2024 |
| 469 | Seven Wells Oil & Gas Expl. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2014 |
| 470 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 471 | Shady Oil Co. | Brownwood, TX 76801 | Oil & Gas Operator | Apr 2024 |
| 472 | Shamrock Minerals Corporation | Merkel, TX 79536 | Oil & Gas Operator | Nov 1998 |
| 473 | Shenandoah Oil, Inc. (I) | Midland, TX 79710 | Oil & Gas Operator | Apr 1996 |
| 474 | Shifflett Operating Company | Snyder, TX 79550 | Oil & Gas Operator | Apr 2024 |
| 475 | SHL Operating | Lubbock, TX 79416 | Oil & Gas Operator | Apr 2024 |
| 476 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 477 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 478 | Signal Oil And Gas Company | Colleyville, TX 76034 | Oil & Gas Operator | Apr 2024 |
| 479 | Sims, John S. | Lawn, TX 79530 | Oil & Gas Operator | Aug 2003 |
| 480 | Six Oil Producers | Abilene, TX 79601 | Oil & Gas Operator | Sep 2002 |
| 481 | Smalley, Bill | Albany, TX 76430 | Oil & Gas Operator | Jul 2001 |
| 482 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 483 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Apr 2024 |
| 484 | Snyder Drilling Corp. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 485 | Socorro Exploration, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | Apr 2024 |
| 486 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 487 | Solar Exploration TX LLC | Tulsa, OK 74133 | Oil Operator | Dec 2018 |
| 488 | Southern Crude, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2017 |
| 489 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 490 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 491 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 492 | Spence Energy Company | Dallas, TX 75206 | Oil & Gas Operator | Apr 2024 |
| 493 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2024 |
| 494 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 495 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Apr 2024 |
| 496 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 497 | Stearns Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 1993 |
| 498 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 499 | Stephens, Hayseed Oil Inc. | Weatherford, TX 76087 | Oil & Gas Operator | Mar 2008 |
| 500 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | Apr 2024 |