| 401 | Petrogas Energy Services, LLC | Dallas, TX 75214 | Oil Operator | Apr 2024 |
| 402 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 403 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 404 | Pinewood Exploration Inc. | Arlington, TX 76096 | Oil & Gas Operator | Oct 2011 |
| 405 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | Feb 2024 |
| 406 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Jan 2024 |
| 407 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 408 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Apr 2024 |
| 409 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 410 | Precise Development, Inc. | Austin, TX 78709 | Oil & Gas Operator | May 2005 |
| 411 | Precision Operating Inc. | Richardson, TX 75080 | Oil & Gas Operator | Jul 2014 |
| 412 | Premier Natural Resources II,LLC | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2015 |
| 413 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jan 2024 |
| 414 | Primrose Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2007 |
| 415 | Pursley, John | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2024 |
| 416 | Quail Ridge Petroleum LLC | Midland, TX 79710 | Oil & Gas Operator | Apr 2024 |
| 417 | Quatro Oil And Gas, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 418 | Quest Petroleum Company | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2024 |
| 419 | Quest Petroleum, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Apr 2024 |
| 420 | Quest-Tex Energy Op II, LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 421 | R. & R. Exploration, Inc. | Denton, TX 76202 | Oil Operator | Nov 1993 |
| 422 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 423 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 424 | Reddirt Operating, LLC. | Midland, TX 79704 | Oil & Gas Operator | Apr 2024 |
| 425 | Regal Energy Operating, L.L.C. | Plano, TX 75024 | Oil & Gas Operator | Apr 2024 |
| 426 | Reichmann Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Apr 2024 |
| 427 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Apr 2024 |
| 428 | Renaissance Petroleum Co LLC | Houston, TX 77058 | Oil & Gas Operator | Nov 2011 |
| 429 | Republic Energy Inc. | Decatur, TX 76234 | Oil & Gas Operator | Dec 2016 |
| 430 | Revier, J. B. Prod. Company | Wichita Falls, TX 76302 | Oil & Gas Operator | Apr 1996 |
| 431 | Rhyne, J.V. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2024 |
| 432 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2024 |
| 433 | Rife Energy Operating, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2024 |
| 434 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2024 |
| 435 | Rimrock Energy, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2012 |
| 436 | Rivercity Operating, Inc. | Austin, TX 78766 | Oil & Gas Operator | Apr 2024 |
| 437 | RKW Operating LLC | Weatherford, TX 76085 | Gas Operator | Apr 2024 |
| 438 | Roberson, Joe | Vernon, TX 76385 | Oil & Gas Operator | Feb 2015 |
| 439 | Robinson Oil & Gas, Inc. | Chico, TX 76431 | Oil & Gas Operator | Aug 2003 |
| 440 | Rock Petroleum, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2023 |
| 441 | Rodgers, William L. | Fort Worth, TX 76147 | Oil & Gas Operator | Jan 1995 |
| 442 | Roil Mineral & Land Co. | Dallas, TX 75379 | Oil & Gas Operator | Apr 2024 |
| 443 | Rollo Resources, LLC | Granbury, TX 76049 | Gas Operator | Apr 2024 |
| 444 | Ropa Exploration Corp. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2011 |
| 445 | Ropar Operating Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 446 | Rose Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Feb 2002 |
| 447 | Rosehill Operating Company, LLC | Houston, TX 77084 | Oil & Gas Operator | Sep 2021 |
| 448 | Roseland Oil & Gas Inc | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2003 |
| 449 | Ross, Dwight M. DRLG. Co., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 450 | Routh Operating, LLC | Dallas, TX 75204 | Oil & Gas Operator | Mar 2011 |
| 451 | Rubis Oil, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Apr 2024 |
| 452 | Rudman Partnership, The | Dallas, TX 75201 | Oil & Gas Operator | Dec 2014 |
| 453 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | Apr 2024 |
| 454 | Ryan Oil Co | Sherman Oaks, CA 91413 | Oil Operator | Dec 2021 |
| 455 | Ryder Scott Management, LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2018 |
| 456 | Ryder Scott Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2005 |
| 457 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 458 | S&G Oil LLC | Wichita Falls, TX 76309 | Oil & Gas Operator | Apr 2024 |
| 459 | Sabio Oil & Gas Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 1998 |
| 460 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 461 | Saddle Creek Energy Development | Dallas, TX 75251 | Oil & Gas Operator | Nov 2008 |
| 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 | Sanco Operating Company | Bullard, TX 75757 | Oil & Gas Operator | Apr 2024 |
| 466 | Sanders Oil & Gas, LTD. | Granbury, TX 76048 | Oil & Gas Operator | Aug 2015 |
| 467 | Sauder Management Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 468 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 469 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 470 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Jan 2024 |
| 471 | Share Petroleum Corp. | Mabank, TX 75147 | Oil Operator | Apr 2024 |
| 472 | Shiloh Oil Company LLC | Williston, FL 32696 | Oil & Gas Operator | Apr 2024 |
| 473 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 474 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Apr 2024 |
| 475 | Silver Creek Resources, LLC | Irving, TX 75038 | Oil & Gas Operator | Apr 2017 |
| 476 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2024 |
| 477 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 478 | Snow Operating Co., Inc. | Haltom City, TX 76117 | Oil & Gas Operator | Feb 2024 |
| 479 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 480 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 481 | Southern Tejas Asset Group LLC | McAllen, TX 78501 | Oil & Gas Operator | Apr 2024 |
| 482 | Spade Energy L.L.C. | Wichita Falls, TX 76310 | Gas Operator | Apr 2024 |
| 483 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2024 |
| 484 | Spragins, Ed | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 485 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Apr 2024 |
| 486 | Stacha, Eddy A. | Rice, TX 75155 | Oil & Gas Operator | Apr 2024 |
| 487 | Star Of Texas Energy SRVS, Inc. | Austin, TX 78702 | Oil & Gas Operator | Apr 2024 |
| 488 | Stelucan Energy, LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Apr 2024 |
| 489 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 490 | Stonebriar Oil LLC | Frisco, TX 75034 | Oil & Gas Operator | Apr 2024 |
| 491 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 492 | Strata Operating, Inc. | Corpus Chrsti, TX 78466 | Oil & Gas Operator | Apr 2024 |
| 493 | Stratagas, Inc. | Rowlett, TX 75088 | Oil & Gas Operator | May 2006 |
| 494 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Apr 2024 |
| 495 | Stroube Energy Corporation | Dallas, TX 75248 | Oil & Gas Operator | Jan 2012 |
| 496 | Stroud Energy, LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2006 |
| 497 | Suborp Energy, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Sep 2000 |
| 498 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 499 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 500 | Sunrise Enterprises | Bowie, TX 76230 | Oil & Gas Operator | Dec 2016 |