| 401 | Primrose Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2007 |
| 402 | Pro Oil & Gas Inc | Frankfort, IL 60423 | Oil & Gas Operator | May 2014 |
| 403 | Proco Operating Co., Inc. | Graford, TX 76449 | Oil & Gas Operator | Apr 2024 |
| 404 | Pryor Petroleum Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 405 | Pullen Oil & Gas | Richardson, TX 75080 | Oil & Gas Operator | Dec 1997 |
| 406 | Purex Energy LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Oct 2015 |
| 407 | Pursley, John | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2024 |
| 408 | Pyramid Energy Inc | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2012 |
| 409 | Quail Well Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 410 | Quality Petroleum, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Dec 2021 |
| 411 | Quest Petroleum Company | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2024 |
| 412 | Quest Petroleum, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Apr 2024 |
| 413 | Quest-Tex Energy Op II, LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 414 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 415 | Quinlan Engineering | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 416 | R W Operating | Graford, TX 76449 | Oil & Gas Operator | Dec 2016 |
| 417 | Rainwater, John | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 418 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 419 | Raven Operating Group, Inc. | Sedalia, CO 80135 | Oil & Gas Operator | Dec 2010 |
| 420 | Ray Herring Estate | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 421 | Ray Herring Operating Co., LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 422 | Rayco Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 423 | Raylee Operating Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 424 | Red Rock Resources, L.L.C. | Wichita Falls, TX 76310 | Oil & Gas Operator | Jan 2024 |
| 425 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 426 | Remington Oil | South Bend, TX 76481 | Oil & Gas Operator | Mar 2008 |
| 427 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Apr 2024 |
| 428 | Republic Energy Operating, LLC | Decatur, TX 76234 | Oil & Gas Operator | Jan 2016 |
| 429 | Rhodes Drilling Company | Abilene, TX 79608 | Oil & Gas Operator | Sep 2000 |
| 430 | Rhyne, J.V. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2024 |
| 431 | Richey Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 432 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2024 |
| 433 | Ridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 434 | Rife Energy Operating, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2024 |
| 435 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2024 |
| 436 | Rife Operating, LTD. | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2005 |
| 437 | Rife, M. O., Jr. | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 1998 |
| 438 | Rio Grande Drilling Company | San Antonio, TX 78212 | Oil & Gas Operator | Dec 1999 |
| 439 | RKW Operating LLC | Weatherford, TX 76085 | Gas Operator | Apr 2024 |
| 440 | RLB Enterprises, Inc. | Strawn, TX 76475 | Oil & Gas Operator | Feb 1997 |
| 441 | Roanoke Corporation | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 1995 |
| 442 | Rob-Joe Gas & Oil Co. | Ranger, TX 76470 | Oil & Gas Operator | Apr 2024 |
| 443 | Rocker B Production, L.L.C. | Graham, TX 76450 | Gas Operator | Apr 2024 |
| 444 | Rockoil Energy Of Texas, Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Apr 2024 |
| 445 | Roco Petroleum, Incorporated | Abilene, TX 79605 | Oil & Gas Operator | Apr 2024 |
| 446 | Rogers Oilfield Op, Corp. | Granbury, TX 76048 | Oil & Gas Operator | Jul 2019 |
| 447 | Rollo Resources, LLC | Granbury, TX 76049 | Gas Operator | Apr 2024 |
| 448 | Ropar Operating Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 449 | Roseland Oil & Gas Inc | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2003 |
| 450 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 451 | Rover Operating Company, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 452 | Roxanna Oil Company | Oklahoma City, OK 73120-2717 | Oil Operator | Aug 2016 |
| 453 | Royal Texan Resources Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 454 | Royal Texas Petroleum | Lago VIsta, TX 78645 | Oil & Gas Operator | Apr 2024 |
| 455 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | Apr 2024 |
| 456 | Ryan, Joseph G. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 457 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 458 | S. P. Penntex Energy, L.P. | Abilene, TX 79605 | Oil & Gas Operator | May 2003 |
| 459 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 460 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Apr 2024 |
| 461 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 462 | Sage Natural Resources LLC | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2024 |
| 463 | Sage Oil And Gas, LLC | Graham, TX 76450 | Gas Operator | Apr 2024 |
| 464 | Saguaro Petroleum, LLC | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 465 | Salt Of The Earth Energy, LLC | Montgomery, TX 77356 | Oil & Gas Operator | Apr 2024 |
| 466 | Sanco Operating Company | Bullard, TX 75757 | Oil & Gas Operator | Apr 2024 |
| 467 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 468 | Sandollar Oil & Gas, Inc. | Hallsville, TX 75650 | Oil & Gas Operator | Feb 1993 |
| 469 | Scully And Smith Oil Corporation | Salado, TX 76571 | Oil & Gas Operator | Feb 1995 |
| 470 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 471 | Sendero Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Apr 2024 |
| 472 | Sequoia Energy Resources | Dallas, TX 75207 | Oil & Gas Operator | Apr 2024 |
| 473 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 474 | Sequoia Natural Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 475 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 476 | Sha Stephens, Incorporated | Weatherford, TX 76087 | Oil & Gas Operator | Apr 2006 |
| 477 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2024 |
| 478 | Sharoco Corporation | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 1996 |
| 479 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Apr 2024 |
| 480 | Shelley, Richard W | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2015 |
| 481 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Apr 2024 |
| 482 | Silver Creek Resources, LLC | Irving, TX 75038 | Oil & Gas Operator | Apr 2017 |
| 483 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 484 | Sitton, Ronnie Incorporated | Graford, TX 76449 | Oil & Gas Operator | Feb 2020 |
| 485 | Sky Development Corporation | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 486 | Sky Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 487 | Skybridge Energy LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2024 |
| 488 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2024 |
| 489 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 490 | Snow Operating Co., Inc. | Haltom City, TX 76117 | Oil & Gas Operator | Feb 2024 |
| 491 | Spence Energy Company | Dallas, TX 75206 | Oil & Gas Operator | Apr 2024 |
| 492 | Spi Operations LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2013 |
| 493 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2024 |
| 494 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2024 |
| 495 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 496 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 497 | Staley Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 498 | Stamper Operating Co., Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2024 |
| 499 | STB Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2008 |
| 500 | Steller Energy & Investment Corp | Plano, TX 75093 | Oil & Gas Operator | Feb 2021 |