| 401 | Petrocorp Acquisition Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2002 |
| 402 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 403 | Petrosource Energy Corporation | Fort Worth, TX 76112 | Oil & Gas Operator | Apr 2024 |
| 404 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 405 | Pinon Petroleum, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Apr 2004 |
| 406 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 407 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 408 | Plantation Operating, LLC | Houston, TX 77041 | Oil & Gas Operator | Nov 2011 |
| 409 | Pony Oil Company | Borger, TX 79008 | Oil & Gas Operator | Jul 2001 |
| 410 | Post Oak Operating, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 411 | Powell-McCarroll Partnership | Sachse, TX 75048 | Oil & Gas Operator | Apr 2024 |
| 412 | Prentice Petroleum, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Sep 1994 |
| 413 | Prickly Pair Production | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 414 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jan 2024 |
| 415 | Primrose Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2007 |
| 416 | Pro Oil & Gas Inc | Frankfort, IL 60423 | Oil & Gas Operator | May 2014 |
| 417 | Probe Offshore, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 418 | Pryor, Curtis | Lubbock, TX 79424 | Oil & Gas Operator | Dec 1998 |
| 419 | PV Oil Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 420 | Quail Operating, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 421 | Quantum Investments | Lubbock, TX 79424 | Oil Operator | Apr 2024 |
| 422 | Quest Emg, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 423 | Quest Petroleum, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Apr 2024 |
| 424 | R J Operating Company | Albany, TX 76430 | Oil & Gas Operator | Dec 2023 |
| 425 | R.P.Wilson, Inc. | Stephenville, TX 76401 | Oil & Gas Operator | Jan 2011 |
| 426 | Rampart Petroleum, Incorporated | Buffalo Gap, TX 79508 | Oil & Gas Operator | Jan 2009 |
| 427 | Ratex Energy Inc. | Manchaca, TX 78652 | Oil & Gas Operator | Sep 2002 |
| 428 | Rattlesnake Mountain Oil LLC | Newport, OR 97365 | Oil & Gas Operator | Apr 2024 |
| 429 | Ray - A Operating Inc. | Albany, TX 76430 | Oil Operator | Apr 2024 |
| 430 | Raylee Operating Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 431 | Red Man Oil, Co. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 432 | Red-Tex Energy Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2000 |
| 433 | Red-Tex Petroleum, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Aug 2003 |
| 434 | Reostar Operating Incorporated | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2012 |
| 435 | Revard Petroleum, L.L.C. | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2024 |
| 436 | Richards, Tot Oil Co. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 437 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 438 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2024 |
| 439 | Richland Energy, Inc. | Irving, TX 75063 | Oil & Gas Operator | Apr 2024 |
| 440 | Ridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 441 | Ridglea Energy I, LLC | Spring, TX 77379 | Oil & Gas Operator | Apr 2024 |
| 442 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2024 |
| 443 | Rister, Dewey | Avoca, TX 79503 | Oil & Gas Operator | Apr 2024 |
| 444 | Ro-Jo, Inc. | Highland VLG, TX 75077 | Oil & Gas Operator | Aug 2003 |
| 445 | Robertson Resources, Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2024 |
| 446 | Robuck Petroleum, LLC | Nacogdoches, TX 75965 | Oil & Gas Operator | Apr 2024 |
| 447 | Roco Petroleum, Incorporated | Abilene, TX 79605 | Oil & Gas Operator | Apr 2024 |
| 448 | Rocoso Resources, LLC | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 449 | Rogers Drilling Co. | Olney, TX 76374 | Oil & Gas Operator | Apr 2024 |
| 450 | Ross Engineering, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Apr 2024 |
| 451 | Rough Hollow Ranch Corporation | Dallas, TX 75209 | Oil Operator | Aug 2006 |
| 452 | Rover Petroleum Operating, LLC | Plano, TX 75075 | Oil & Gas Operator | Apr 2024 |
| 453 | Royal Texan Energy Co. | Irvine, CA 92618 | Oil & Gas Operator | Apr 2024 |
| 454 | Ruff | Albany, TX 76430 | Oil & Gas Operator | Aug 2017 |
| 455 | Ruff Drilling Company | Albany, TX 76430 | Oil & Gas Operator | Dec 2019 |
| 456 | Ruff Oil Co. | Albany, TX 76430 | Oil Operator | Apr 2024 |
| 457 | Russell, T. Operating Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Aug 2005 |
| 458 | Rust Oil Corp. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2024 |
| 459 | Ruthson Energy, Inc. | Judson, TX 75660 | Oil Operator | Apr 2024 |
| 460 | S & H Resources | Abilene, TX 79605 | Oil & Gas Operator | Apr 2024 |
| 461 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 462 | S & S & H Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Jul 2004 |
| 463 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 464 | Sabine Pipe & Supply Co. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2004 |
| 465 | Saddle Creek Oil, LLC | Albany, TX 76430 | Oil Operator | Apr 2024 |
| 466 | Sage Oil And Gas, LLC | Graham, TX 76450 | Gas Operator | Apr 2024 |
| 467 | Salida Exploration, LLC | Abilene, TX 79603 | Oil & Gas Operator | Apr 2024 |
| 468 | Saling Oil Co. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2002 |
| 469 | Salty Lime Energy, LLC | Ovalo, TX 79541 | Oil Operator | Apr 2024 |
| 470 | Sanders Energy LLC | Aledo, TX 76008 | Oil & Gas Operator | Apr 2024 |
| 471 | Sandstone Services, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 472 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 473 | Schetawee, Inc. | Hamlin, TX 79520 | Oil & Gas Operator | Mar 2008 |
| 474 | Schkade Bros. Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 2021 |
| 475 | Schkade Production Co. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2020 |
| 476 | Schkade, Carl E. | Albany, TX 76430 | Oil & Gas Operator | Sep 2009 |
| 477 | Schkade, Harold | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 478 | Schkade, Louis | Albany, TX 76430 | Oil & Gas Operator | Mar 2008 |
| 479 | Scott Operating, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 480 | Sedona Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 481 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 482 | Senkel, Wesley, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2007 |
| 483 | Sequoia Energy Resources | Dallas, TX 75207 | Oil & Gas Operator | Apr 2024 |
| 484 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 485 | Sequoia Natural Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 486 | Seven Wells Oil & Gas Expl. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2014 |
| 487 | Shack, Bill | Albany, TX 76430 | Oil & Gas Operator | Apr 2006 |
| 488 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2024 |
| 489 | Sheets Exploration Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2016 |
| 490 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Apr 2024 |
| 491 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 492 | Sierra Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2008 |
| 493 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 494 | Sirena Holdings LLC Series 1 | Moran, TX 76464 | Oil & Gas Operator | Apr 2024 |
| 495 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2024 |
| 496 | Smalley, Bill | Albany, TX 76430 | Oil & Gas Operator | Jul 2001 |
| 497 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 498 | Snyder Drilling Corp. | Albany, TX 76430 | Oil & Gas Operator | Apr 2024 |
| 499 | So Operating Company | Cisco, TX 76437 | Oil & Gas Operator | Apr 2024 |
| 500 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |