| 401 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 402 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 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 | Petrocorp Acquisition Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2002 |
| 406 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 407 | Petroleum Capital, L.C. | Dallas, TX 75367 | Oil & Gas Operator | Apr 2026 |
| 408 | Pfed Operating | Keller, TX 76248 | Oil Operator | Apr 2026 |
| 409 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Apr 2026 |
| 410 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 411 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 412 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 413 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 414 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 415 | Pobres Incorporated | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2008 |
| 416 | Pogue, Randall R. | Ada, OK 74820 | Oil & Gas Operator | May 2003 |
| 417 | Powell-McCarroll Partnership | Sachse, TX 75048 | Oil & Gas Operator | Apr 2026 |
| 418 | Power, Scott | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 1997 |
| 419 | Prensorus Energy, LLC | Abilene, TX 79604 | Oil & Gas Operator | Apr 2026 |
| 420 | Prickett, Jimmy | Wichita Falls, TX 76308 | Oil Operator | Feb 2002 |
| 421 | Probe Offshore, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 422 | Putnam, Joe Oil Company | Abilene, TX 79606 | Oil & Gas Operator | Apr 2026 |
| 423 | PV Oil Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Apr 2026 |
| 424 | Pyramid Energy Inc | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2012 |
| 425 | Pyramid Production Co. | Abilene, TX 79608 | Oil & Gas Operator | Jun 1994 |
| 426 | Ram Oil And Gas, Inc. | Walsh, CO 81090 | Oil & Gas Operator | Apr 2026 |
| 427 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 428 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 429 | Ramco Operating Company | Tulsa, OK 74135 | Oil & Gas Operator | Jan 1998 |
| 430 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 431 | Raptor Petroleum II, LLC | Houston, TX 77251 | Oil & Gas Operator | Apr 2026 |
| 432 | Raylee Operating Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 433 | Redwine Oil Company | Throckmorton, TX 76483 | Oil & Gas Operator | Jul 2009 |
| 434 | Reef Exploration, Inc. (A-1) | Richardson, TX 75080 | Oil & Gas Operator | Oct 2006 |
| 435 | Reese Wellsite Supervision, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 436 | Reliance Operating Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 437 | Renaissance Petroleum Co LLC | Houston, TX 77058 | Oil & Gas Operator | Nov 2011 |
| 438 | Reserve Production, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Mar 2008 |
| 439 | Reynolds, Richard | Seymour, TX 76380 | Oil & Gas Operator | Mar 2008 |
| 440 | Ric Petroleum, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2003 |
| 441 | Richards, Tot Dozer, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | May 2013 |
| 442 | Richards, Tot Oil Co. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2026 |
| 443 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 444 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2026 |
| 445 | Richland Energy, Inc. | Irving, TX 75063 | Oil & Gas Operator | Apr 2026 |
| 446 | Ridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 447 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2026 |
| 448 | Riley Production | Throckmorton, TX 76483 | Oil & Gas Operator | Apr 2026 |
| 449 | Rio Grande Drilling Company | San Antonio, TX 78212 | Oil & Gas Operator | Dec 1999 |
| 450 | Rivercity Operating, Inc. | Austin, TX 78766 | Oil & Gas Operator | Apr 2026 |
| 451 | Roberts & Hammack, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Apr 2026 |
| 452 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Apr 2026 |
| 453 | Robuck Petroleum, LLC | Nacogdoches, TX 75965 | Oil & Gas Operator | Apr 2026 |
| 454 | Rodgers, William L. | Fort Worth, TX 76147 | Oil & Gas Operator | Jan 1995 |
| 455 | Rogers Drilling Co. | Olney, TX 76374 | Oil & Gas Operator | Apr 2026 |
| 456 | Romac Oil Company, Inc. | Throckmorton, TX 76483 | Oil & Gas Operator | Apr 2026 |
| 457 | Ross, Dwight M. DRLG. Co., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2026 |
| 458 | Ruff Drilling Company | Albany, TX 76430 | Oil & Gas Operator | Dec 2019 |
| 459 | Russell, T. Operating Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Aug 2005 |
| 460 | Ruthson Energy, Inc. | Judson, TX 75660 | Oil Operator | Apr 2026 |
| 461 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | Apr 2026 |
| 462 | Ryder Scott Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2005 |
| 463 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 464 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 465 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Apr 2026 |
| 466 | Safari Resources, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2026 |
| 467 | Salty Lime Energy, LLC | Ovalo, TX 79541 | Oil Operator | Apr 2026 |
| 468 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 469 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 470 | Schkade Bros. Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 2021 |
| 471 | Scott Oil Company | Corsicana, TX 75110 | Oil & Gas Operator | Apr 2011 |
| 472 | Scott Operating, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2026 |
| 473 | Senkel, Wesley, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2007 |
| 474 | Sha Stephens, Incorporated | Weatherford, TX 76087 | Oil & Gas Operator | Apr 2006 |
| 475 | Shack, Bill | Albany, TX 76430 | Oil & Gas Operator | Apr 2006 |
| 476 | Shadawn Corporation | Wichita Falls, TX 76310 | Oil & Gas Operator | Mar 2005 |
| 477 | Shamrock Minerals Corporation | Merkel, TX 79536 | Oil & Gas Operator | Nov 1998 |
| 478 | Shanks, Bob | Haskell, OK 74436 | Oil Operator | Sep 2002 |
| 479 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2026 |
| 480 | Sheets Exploration Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2016 |
| 481 | Sheets, P. A. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 1994 |
| 482 | Shelco | Maysville, MO 64469 | Oil & Gas Operator | May 2021 |
| 483 | Sierra Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2008 |
| 484 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Apr 2026 |
| 485 | Smith, W. Don | Breckenridge, TX 76424 | Oil & Gas Operator | Aug 2001 |
| 486 | So Operating Company | Cisco, TX 76437 | Oil & Gas Operator | Apr 2026 |
| 487 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 2026 |
| 488 | Soldier Creek Energy, LLC | Edmond, OK 73013 | Oil & Gas Operator | Apr 2026 |
| 489 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 490 | Southern Alliance Oil Corp. | Grapevine, TX 76099 | Oil & Gas Operator | Apr 2026 |
| 491 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 492 | Southlake Exploration, Inc. | Southlake, TX 76092 | Oil & Gas Operator | Apr 2026 |
| 493 | Spade Energy L.L.C. | Fort Worth, TX 76177 | Oil & Gas Operator | Apr 2026 |
| 494 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 495 | Speller Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2026 |
| 496 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Apr 2026 |
| 497 | Spitfire Partners, LLC | Dallas, TX 75225 | Oil Operator | Apr 2026 |
| 498 | Squyres Oil Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2024 |
| 499 | Stamper Operating Co., Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2026 |
| 500 | Stasney Well Service, LLC | Albany, TX 76430 | Oil & Gas Operator | Apr 2026 |