| 401 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 402 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Mar 2026 |
| 403 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 404 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 405 | Piedra Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2023 |
| 406 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2026 |
| 407 | Pitco Investments, LTD. | Scottsdale, AZ 85261 | Oil & Gas Operator | Jan 2013 |
| 408 | Pitts Energy Co. | Midland, TX 79707 | Oil & Gas Operator | Mar 2026 |
| 409 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 410 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 411 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 412 | Platform Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2026 |
| 413 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Mar 2026 |
| 414 | PPC Operating Company LLC | Houston, TX 77279 | Oil & Gas Operator | Jul 2019 |
| 415 | Prasad, Hari Production Co. | Midland, TX 79701 | Oil & Gas Operator | Mar 2026 |
| 416 | Prasad, LTD. | Midland, TX 79701 | Oil & Gas Operator | Sep 2006 |
| 417 | Premier Natural Resources, L.P. | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2007 |
| 418 | Premier Natural Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2026 |
| 419 | Premier Operating Company | Tulsa, OK 74153 | Gas Operator | Nov 1996 |
| 420 | Prime Operating Company | Midland, TX 79705 | Oil & Gas Operator | Mar 2026 |
| 421 | Pro- Gas, Inc. | Midland, TX 79711 | Oil & Gas Operator | Mar 2026 |
| 422 | Probity Operating, LLC | Midland, TX 79708 | Oil & Gas Operator | Jul 2014 |
| 423 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |
| 424 | Purvis Oil Corp | Midland, TX 79702 | Oil & Gas Operator | Jul 1994 |
| 425 | Purvis Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Mar 2026 |
| 426 | Purvis, J. H. | Midland, TX 79702 | Oil & Gas Operator | Dec 1994 |
| 427 | QP, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2026 |
| 428 | Qualia, C. F. Operating,Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2013 |
| 429 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Dec 2025 |
| 430 | Quay Valley, Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2007 |
| 431 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 432 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 433 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 434 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Mar 2026 |
| 435 | Ranger 40 Petroleum, LLC | Fairfield, CT 06824 | Oil & Gas Operator | Mar 2026 |
| 436 | Rattler Midstream Operating LLC | Midland, TX 79701 | Oil Operator | Mar 2026 |
| 437 | Rayden | Southlake, TX 76092 | Oil & Gas Operator | Mar 2026 |
| 438 | RBJ & Associates, LP | Midland, TX 79707 | Oil Operator | Jan 2020 |
| 439 | Reach Oil And Gas Company Inc | Oklahoma City, OK 73118-1100 | Oil & Gas Operator | Dec 2025 |
| 440 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2026 |
| 441 | Red Stone Resources LLC | Edmond, OK 73013 | Oil Operator | Jun 2023 |
| 442 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 443 | Regions Energy LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2016 |
| 444 | Regions Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 445 | Remo, Inc. | Odessa, TX 79760 | Oil & Gas Operator | May 2003 |
| 446 | Rendova Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2002 |
| 447 | Resolute Natural Res. Co., LLC | Midland, TX 79706 | Oil & Gas Operator | Mar 2026 |
| 448 | Reverence Operating LLC | Odessa, TX 79768 | Oil & Gas Operator | Mar 2026 |
| 449 | Rex Energy Operating Corp. | State College, PA 16801 | Oil & Gas Operator | Jun 2012 |
| 450 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 451 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Mar 2026 |
| 452 | Rio Oil And Gas (Permian) II,LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Nov 2024 |
| 453 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 454 | Rittenhouse Oil & Gas Co. | Midland, TX 79702 | Oil & Gas Operator | Mar 2026 |
| 455 | Rki Exploration & Production LLC | Tulsa, OK 74172 | Oil & Gas Operator | Mar 2026 |
| 456 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 457 | Roberts & Hammack, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2026 |
| 458 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Mar 2026 |
| 459 | Rock Fish Operating LLC | McKinney, TX 75070 | Oil & Gas Operator | Mar 2026 |
| 460 | Romine Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Mar 2026 |
| 461 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2026 |
| 462 | RP Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Mar 2026 |
| 463 | RSP Permian, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2018 |
| 464 | Rust Oil Corp. | Fort Worth, TX 76121 | Oil & Gas Operator | Mar 2026 |
| 465 | Sahara Operating Company | Midland, TX 79704 | Oil & Gas Operator | Mar 2026 |
| 466 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 467 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 468 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 469 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2026 |
| 470 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 471 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Mar 2026 |
| 472 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 473 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 474 | Schlagal, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2016 |
| 475 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Mar 2026 |
| 476 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 477 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 478 | Seaboard Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Mar 2026 |
| 479 | Shackelford,Frank Oil Properties | Midland, TX 79701 | Oil & Gas Operator | Aug 1997 |
| 480 | Shale Energy LLC | Jeffersonville, KY 40337 | Oil Operator | Dec 2018 |
| 481 | Shenandoah Petroleum Corporation | Midland, TX 79705 | Oil & Gas Operator | Mar 2026 |
| 482 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Mar 2026 |
| 483 | Shifflett Operating Company | Snyder, TX 79550 | Oil & Gas Operator | Mar 2026 |
| 484 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 485 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Mar 2026 |
| 486 | Six-S Properties, Inc. | Austin, TX 78767 | Oil & Gas Operator | Mar 2026 |
| 487 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Mar 2026 |
| 488 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Mar 2026 |
| 489 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2026 |
| 490 | Smith Brothers Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2026 |
| 491 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Mar 2026 |
| 492 | Snow Oil & Gas Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2026 |
| 493 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 494 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2026 |
| 495 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 496 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2026 |
| 497 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 498 | Spirit O&G Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Mar 2026 |
| 499 | Spur Energy | Midland, TX 79708 | Oil & Gas Operator | Mar 1996 |
| 500 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |