| 401 | Person Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Sep 2002 |
| 402 | Person, Claude | Bowie, TX 76230 | Oil & Gas Operator | Apr 2007 |
| 403 | Peterson Oil And Gas LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Apr 2026 |
| 404 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 405 | Petro-Guard Company, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2014 |
| 406 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 407 | Pikeco Inc | Whitesboro, TX 76273 | Oil & Gas Operator | Nov 2001 |
| 408 | Pioneer Energy Corporation | Dallas, TX 75204 | Oil & Gas Operator | Apr 2026 |
| 409 | Playa Minerals & Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2003 |
| 410 | Pobres Incorporated | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2008 |
| 411 | Pogue, Randall R. | Ada, OK 74820 | Oil & Gas Operator | May 2003 |
| 412 | Pop Operating Company | Denton, TX 76202 | Oil & Gas Operator | Apr 2026 |
| 413 | Powell & Brown | Denver City, TX 79323 | Oil & Gas Operator | Mar 2008 |
| 414 | PRC Operating, Inc. | Bowie, TX 76230 | Oil & Gas Operator | Apr 2026 |
| 415 | Precise Development, Inc. | Austin, TX 78709 | Oil & Gas Operator | May 2005 |
| 416 | Precision Operating Inc. | Richardson, TX 75080 | Oil & Gas Operator | Jul 2014 |
| 417 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 418 | Primrose Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2007 |
| 419 | Producers Operating Co Inc | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2026 |
| 420 | Pruitt Oil & Gas | Decatur, TX 76234 | Oil & Gas Operator | Feb 2018 |
| 421 | Pryor Petroleum Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 422 | Publishers Petroleum | Dallas, TX 75219 | Oil & Gas Operator | Aug 2003 |
| 423 | Pullen Oil & Gas | Richardson, TX 75080 | Oil & Gas Operator | Dec 1997 |
| 424 | Pursley, John | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2026 |
| 425 | Quail Ridge Operating LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 426 | Quatro Oil And Gas, Inc. | Joshua, TX 76058 | Oil & Gas Operator | Apr 2026 |
| 427 | Quest Petroleum, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Apr 2026 |
| 428 | R2Q Operating LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2026 |
| 429 | Ram Oil And Gas, Inc. | Walsh, CO 81090 | Oil & Gas Operator | Apr 2026 |
| 430 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 431 | Raylee Operating Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 432 | Red River Operating & DRLG. Co. | Wylie, TX 75098 | Oil & Gas Operator | Apr 2026 |
| 433 | Renaissance Petroleum Co LLC | Houston, TX 77058 | Oil & Gas Operator | Nov 2011 |
| 434 | Revier Resources Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2005 |
| 435 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2026 |
| 436 | Rife Energy Operating, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2026 |
| 437 | Rife, M. O., Jr. | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 1998 |
| 438 | Rio Bravo Production, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 439 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 440 | RLS Oil Company | Tulia, TX 79088 | Oil & Gas Operator | Apr 2026 |
| 441 | Roberts & Hammack, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Apr 2026 |
| 442 | Roca Production, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2026 |
| 443 | Rocking, R, Drilling & Prod Co. | Bowie, TX 76230 | Oil & Gas Operator | Apr 2026 |
| 444 | Rockoil Energy Of Texas, Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Apr 2026 |
| 445 | Rocky Point Oil, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 446 | Rodgers, William L. | Fort Worth, TX 76147 | Oil & Gas Operator | Jan 1995 |
| 447 | Rogers Drilling Co. | Olney, TX 76374 | Oil & Gas Operator | Apr 2026 |
| 448 | Ropar Operating Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2026 |
| 449 | Ross, Dwight M. DRLG. Co., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2026 |
| 450 | Royal Petroleum Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2026 |
| 451 | Rubis Oil, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Apr 2026 |
| 452 | Rucker, Gary | Archer City, TX 76351 | Oil & Gas Operator | Dec 2003 |
| 453 | Ruwco Oil And Gas Corp. | Austin, TX 78701 | Oil & Gas Operator | Aug 2021 |
| 454 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | Apr 2026 |
| 455 | Ryder Scott Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2005 |
| 456 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 457 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 458 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 459 | Schaffner, Cecil | Byers, TX 76357 | Oil & Gas Operator | Apr 2004 |
| 460 | Schalk, Thomas S. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 1995 |
| 461 | Schenk Oil Co. | Scotland, TX 76379 | Oil Operator | Apr 2026 |
| 462 | Schlittler, Willard | Bryson, TX 76427 | Oil & Gas Operator | Apr 2026 |
| 463 | Seale, Don R. | Electra, TX 76360 | Oil & Gas Operator | Apr 2026 |
| 464 | Seelye, William L. | Plano, TX 75024 | Oil & Gas Operator | Oct 2005 |
| 465 | Sharp, Cherry L | Jacksboro, TX 76458 | Oil Operator | Apr 2026 |
| 466 | Sharp, John T. | Jacksboro, TX 76458 | Oil & Gas Operator | Jul 2014 |
| 467 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 468 | Shelley, Richard W | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2015 |
| 469 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Apr 2026 |
| 470 | Shiloh Oil Company LLC | Williston, FL 32696 | Oil & Gas Operator | Apr 2026 |
| 471 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Apr 2026 |
| 472 | Silver Creek Resources, LLC | Irving, TX 75038 | Oil & Gas Operator | Apr 2017 |
| 473 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2026 |
| 474 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Apr 2026 |
| 475 | Smith, Ted H. | Wichita Falls, TX 76310 | Oil & Gas Operator | Sep 1998 |
| 476 | Smulcer, Jimmy A. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2002 |
| 477 | South Texas Drilling & Expl, Inc | San Antonio, TX 78217 | Oil & Gas Operator | Jan 1999 |
| 478 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 479 | Spade Energy L.L.C. | Fort Worth, TX 76177 | Oil & Gas Operator | Apr 2026 |
| 480 | Spikes, Harry | Henrietta, TX 76365 | Oil & Gas Operator | Sep 2000 |
| 481 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Apr 2026 |
| 482 | Spragins, Ed | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 483 | Springfield Oil Services, Inc. | Mamaroneck, NY 10543 | Oil & Gas Operator | Apr 2026 |
| 484 | Spruiell Drilling Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Apr 2026 |
| 485 | St Johns Operating #1 LP | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 486 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 487 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 488 | Stal Oil Production, L.L.C. | Argyle, TX 76226 | Oil Operator | Apr 2026 |
| 489 | Stamper Operating Co., Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2026 |
| 490 | Staub, Larry, Inc. | Azle, TX 76020 | Oil & Gas Operator | Apr 2026 |
| 491 | STB Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2008 |
| 492 | Steinberger, D. | Windthorst, TX 76389 | Oil & Gas Operator | Oct 1995 |
| 493 | Steinberger, Gerald | Windthorst, TX 76389 | Oil & Gas Operator | Sep 2007 |
| 494 | Stelucan Energy, LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Apr 2026 |
| 495 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2026 |
| 496 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 497 | Stewart Construction | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 498 | Stine Massie Oil, LLC | Mansfield, TX 76063 | Oil Operator | Jul 2025 |
| 499 | Stine Oil Company | Mansfield, TX 76063 | Oil Operator | Mar 2016 |
| 500 | Stine, Ward L.Oil Company | Windthorst, TX 76389 | Oil & Gas Operator | Oct 1999 |