| 401 | Precise Development, Inc. | Austin, TX 78709 | Oil & Gas Operator | May 2005 |
| 402 | Precision Operating Inc. | Richardson, TX 75080 | Oil & Gas Operator | Jul 2014 |
| 403 | Price, W. H. | Granbury, TX 76048 | Oil & Gas Operator | Jun 2024 |
| 404 | Primera Energy, LLC | Longview, TX 75606 | Oil & Gas Operator | Mar 2016 |
| 405 | Producers Operating Co Inc | Amarillo, TX 79105 | Oil & Gas Operator | May 2025 |
| 406 | Pruitt Oil & Gas | Decatur, TX 76234 | Oil & Gas Operator | Feb 2018 |
| 407 | Publishers Petroleum | Dallas, TX 75219 | Oil & Gas Operator | Aug 2003 |
| 408 | Quail Ridge Operating LLC | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 409 | Quatro Oil And Gas, Inc. | Joshua, TX 76058 | Oil & Gas Operator | May 2025 |
| 410 | R & R Energy, LTD. | Muenster, TX 76252 | Oil Operator | May 2025 |
| 411 | R&K Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | May 2025 |
| 412 | R. & R. Exploration, Inc. | Denton, TX 76202 | Oil Operator | Nov 1993 |
| 413 | R2Q Operating LLC | Iowa Park, TX 76367 | Oil & Gas Operator | May 2025 |
| 414 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 415 | Raven Operating Group, Inc. | Sedalia, CO 80135 | Oil & Gas Operator | Dec 2010 |
| 416 | Redman Operating Company LLC | Nocona, TX 76255 | Oil Operator | May 2025 |
| 417 | Reed Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Jun 2005 |
| 418 | Reed Production, Inc. | Gainesville, TX 76241 | Oil Operator | May 2025 |
| 419 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 420 | Republic Energy Inc. | Decatur, TX 76234 | Oil & Gas Operator | Dec 2016 |
| 421 | Revier, J. B. Prod. Company | Wichita Falls, TX 76302 | Oil & Gas Operator | Apr 1996 |
| 422 | Ric Petroleum, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2003 |
| 423 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | May 2025 |
| 424 | Rife Energy Operating, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | May 2025 |
| 425 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 426 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 427 | RLS Oil Company | Tulia, TX 79088 | Oil & Gas Operator | May 2025 |
| 428 | Roberts & Hammack, Inc. | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 429 | Rocanville Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 430 | Rockin C Production, L.L.C. | Nocona, TX 76255 | Oil Operator | May 2025 |
| 431 | Rocking, R, Drilling & Prod Co. | Bowie, TX 76230 | Oil & Gas Operator | May 2025 |
| 432 | Rohmer Brother'S | Muenster, TX 76252 | Oil & Gas Operator | May 2014 |
| 433 | Rohmer Resources LP | Muenster, TX 76252 | Oil Operator | May 2025 |
| 434 | Rohmer, Tony S. | Muenster, TX 76252 | Oil & Gas Operator | Sep 2015 |
| 435 | Rohmer, William J. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2011 |
| 436 | Roil Mineral & Land Co. | Dallas, TX 75379 | Oil & Gas Operator | May 2025 |
| 437 | Romco | Muenster, TX 76252 | Oil & Gas Operator | Mar 2015 |
| 438 | Ropa Exploration Corp. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2011 |
| 439 | Ropar Operating Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2025 |
| 440 | Roseland Oil & Gas Inc | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2003 |
| 441 | Ross, Dwight M. DRLG. Co., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2025 |
| 442 | Royal Texan Resources Co. | Breckenridge, TX 76424 | Oil & Gas Operator | May 2025 |
| 443 | Rudman Partnership, The | Dallas, TX 75201 | Oil & Gas Operator | Dec 2014 |
| 444 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | May 2025 |
| 445 | Ryder Scott Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2005 |
| 446 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 447 | S&G Oil LLC | Wichita Falls, TX 76309 | Oil & Gas Operator | May 2025 |
| 448 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 449 | Sage Natural Resources LLC | Tulsa, OK 74170 | Oil & Gas Operator | May 2025 |
| 450 | Sage Oil And Gas, LLC | Graham, TX 76450 | Gas Operator | May 2025 |
| 451 | Salmon, Raymond Jr Estate | Nocona, TX 76255 | Oil Operator | May 2025 |
| 452 | Salmon, Raymond, Jr. | Nocona, TX 76255 | Oil & Gas Operator | Sep 2017 |
| 453 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | May 2025 |
| 454 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 455 | Schkade Bros. Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 2021 |
| 456 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 457 | Seel-Mac Oil & Gas LLC | Richardson, TX 75080 | Oil Operator | Jul 2011 |
| 458 | Seelye, William L. | Plano, TX 75024 | Oil & Gas Operator | Oct 2005 |
| 459 | Seitz, J. R. & Adam | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2008 |
| 460 | Self Brothers | Montague, TX 76251 | Oil & Gas Operator | May 2025 |
| 461 | Sequoia Oil & Gas, Inc. | Fort Worth, TX 76164 | Oil & Gas Operator | Jan 1993 |
| 462 | Service Clearing Corp | Dallas, TX 75229 | Oil & Gas Operator | May 2025 |
| 463 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 464 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | May 2025 |
| 465 | Silver Creek Resources, LLC | Irving, TX 75038 | Oil & Gas Operator | Apr 2017 |
| 466 | Skidmore Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jul 1997 |
| 467 | Skidmore, James E. | Nocona, TX 76255 | Oil & Gas Operator | Nov 2008 |
| 468 | Skinner Cattle, Inc. | Nocona, TX 76255 | Oil Operator | May 2025 |
| 469 | Smith & Spragins | Wichita Falls, TX 76301 | Oil & Gas Operator | Jul 1995 |
| 470 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 471 | Snow Oil Company | Nocona, TX 76255 | Oil Operator | May 2025 |
| 472 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | May 2025 |
| 473 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 474 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 475 | Spragins, Ed | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 476 | Spruiell Drilling Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | May 2025 |
| 477 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | May 2025 |
| 478 | Sta-Kel Incorporated | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 479 | Star Of Texas Energy SRVS, Inc. | Austin, TX 78702 | Oil & Gas Operator | May 2025 |
| 480 | Stasney, H. R. & Sons, LTD. | Albany, TX 76430 | Oil & Gas Operator | May 2025 |
| 481 | Stelucan Energy, LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | May 2025 |
| 482 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 483 | Stone, J. G. Oil Co. | Victoria, TX 77904 | Oil & Gas Operator | Sep 2018 |
| 484 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 485 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 486 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 487 | Suncoast Technical Services Inc | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 488 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 489 | Swan Production Co. | Jacksboro, TX 76458 | Oil & Gas Operator | Nov 2009 |
| 490 | Swanson, Tommy Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Mar 2017 |
| 491 | Synergy Operating Co., LLC | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 492 | T. R. Production, Inc. | Pilot Point, TX 76258 | Oil & Gas Operator | Jul 2021 |
| 493 | Tanglewood Oil & Gas Co. | Gouldbusk, TX 76845 | Oil & Gas Operator | May 2025 |
| 494 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 495 | Targo Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 496 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 497 | Taylor, G. E. | Bridgeport, TX 76426 | Oil & Gas Operator | Jan 2001 |
| 498 | Taylor, G. E. Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Jul 2007 |
| 499 | Tega Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2012 |
| 500 | Tejas Western Corp. | Granbury, TX 76048 | Oil & Gas Operator | Jul 2018 |