| 401 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 402 | Powell, Gene Investments, Inc. | Longview, TX 75608 | Oil & Gas Operator | Apr 2024 |
| 403 | Preston Exploration LLC | Spring, TX 77387 | Oil & Gas Operator | Dec 2014 |
| 404 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2024 |
| 405 | Pride Exploration, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2015 |
| 406 | Princess Three Corporation | Henderson, TX 75653 | Oil & Gas Operator | Apr 2020 |
| 407 | Princess Three Operating, LLC | Henderson, TX 75653 | Oil & Gas Operator | Apr 2024 |
| 408 | Proex Energy Management, L.L.C. | Spring, TX 77386 | Oil & Gas Operator | Apr 2024 |
| 409 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2024 |
| 410 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 411 | PXP Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2007 |
| 412 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Jan 2024 |
| 413 | Quatros Operating Company | Kilgore, TX 75663 | Oil Operator | Apr 2024 |
| 414 | R & C Petroleum, Inc. | Flint, TX 75762 | Oil & Gas Operator | Apr 2024 |
| 415 | R & S Investments | Tulsa, OK 74146-4743 | Oil Operator | Aug 2013 |
| 416 | R. Lacy Services, LTD. | Longview, TX 75606 | Oil & Gas Operator | Apr 2024 |
| 417 | Rabalais, F.W. Inc. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2023 |
| 418 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 419 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2024 |
| 420 | Ratex Energy Inc. | Manchaca, TX 78652 | Oil & Gas Operator | Sep 2002 |
| 421 | RBD-Shelby Agency | Dallas, TX 75283 | Oil & Gas Operator | Dec 1993 |
| 422 | Redmon Oil Company, Inc., The | Plano, TX 75023 | Oil & Gas Operator | Apr 2024 |
| 423 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 424 | Reef Exploration, Inc. (A-1) | Richardson, TX 75080 | Oil & Gas Operator | Oct 2006 |
| 425 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Apr 2024 |
| 426 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 427 | Reserve Management, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 428 | Ress Production Co. | Farmington, NM 87499 | Oil & Gas Operator | Apr 2024 |
| 429 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 430 | Reynolds Drilling Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Apr 2024 |
| 431 | Reynolds E & P, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Apr 2024 |
| 432 | Rfe Operating, LLC | Tyler, TX 75703 | Oil & Gas Operator | Apr 2024 |
| 433 | Richey Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 434 | Richey Properties, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 435 | Rippy Oil Company | Tyler, TX 75702 | Oil & Gas Operator | Apr 2024 |
| 436 | Riverstone Energy Operating, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2024 |
| 437 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 438 | Roberts & Murphy, Inc. | Shreveport, LA 71137 | Oil & Gas Operator | Apr 2016 |
| 439 | Rockcliff Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 440 | Rodessa Management, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 1995 |
| 441 | Rojo Burro Petroleo & Gas | Kilgore, TX 75662 | Oil & Gas Operator | Aug 2007 |
| 442 | Roosth & Genecov Production Co. | Tyler, TX 75710 | Oil & Gas Operator | Aug 2003 |
| 443 | Roosth Production Co. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 444 | Rusk Co. Well Service Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 445 | Rusk Energy Management, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2008 |
| 446 | S M K Energy Corporation | Corpus Chrsti, TX 78475 | Oil & Gas Operator | Apr 2024 |
| 447 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 448 | Sabine Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 449 | Sabine Pipe & Supply Co. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2004 |
| 450 | Salt Creek Resources, LLC | Caney, KS 67333 | Oil Operator | Oct 2019 |
| 451 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2024 |
| 452 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 453 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 454 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2024 |
| 455 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 456 | Scheriger Production | Graham, TX 76450 | Oil & Gas Operator | Jun 2006 |
| 457 | SDG Operating Company, Inc | Tyler, TX 75701 | Oil & Gas Operator | Apr 2024 |
| 458 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 459 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 460 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 461 | Sendero Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Apr 2024 |
| 462 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Apr 2024 |
| 463 | Shappell Oil Company | Holliday, TX 76366 | Oil & Gas Operator | Sep 2012 |
| 464 | Shappell Oil Company, L.L.C. | Kilgore, TX 75663 | Oil Operator | Apr 2024 |
| 465 | Shelby Operating Company | Dallas, TX 75205 | Oil & Gas Operator | Apr 2024 |
| 466 | Shelby Production Co. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2009 |
| 467 | Shelby, Michael H. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 1994 |
| 468 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 469 | Sheridan Production Co III, LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 470 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2024 |
| 471 | Shield Operating Co. | Georgetown, TX 78627 | Oil & Gas Operator | Aug 2003 |
| 472 | Shivers, Linward, Operator | Shreveport, LA 71161 | Oil & Gas Operator | Sep 1997 |
| 473 | Shoco Production LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 474 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 475 | Shuler Drilling Co., Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Feb 2024 |
| 476 | Sikes Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Jun 2003 |
| 477 | Silver Hill Energy Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 478 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 479 | Silver Oak Operating, LLC | Longview, TX 75604 | Oil & Gas Operator | Apr 2024 |
| 480 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Feb 2024 |
| 481 | Sinclair Development, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 482 | Siroco Operating Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2010 |
| 483 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 484 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Apr 2024 |
| 485 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2024 |
| 486 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 487 | Smith, R. E. Interests, Inc. | Houston, TX 77027 | Oil & Gas Operator | Mar 1998 |
| 488 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 489 | Sogc, Inc. | Salt Lake Cty, UT 84131 | Oil & Gas Operator | Apr 2024 |
| 490 | Sojitz Energy Venture, Inc. | Houston, TX 77042 | Oil & Gas Operator | Feb 2018 |
| 491 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 492 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 493 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 494 | Sonat Exploration Company-MCR | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 495 | Southcoast Production Inc | Dayton, TX 77535 | Oil & Gas Operator | Apr 2024 |
| 496 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | Apr 2024 |
| 497 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Apr 2024 |
| 498 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 499 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2024 |
| 500 | Sponte Operating, Inc. | Dallas, TX 75313 | Oil & Gas Operator | Apr 2024 |