| 401 | PDC Energy | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 402 | PDC-WV-Co Corporation | Denver, CO 80203 | Oil & Gas Operator | Aug 2010 |
| 403 | Pecos Operating Company, LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2021 |
| 404 | Ped Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 405 | Penergy | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 406 | Pennant Dev. And Prod., LLC | Midland, TX 79702 | Oil Operator | May 2025 |
| 407 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Feb 2025 |
| 408 | Pentex Operating Company | Oklahoma City, OK 73132 | Oil & Gas Operator | Oct 1994 |
| 409 | Perimeter Resource Company | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 410 | Permex Petroleum Corporation | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 411 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 412 | Permian Solutions LLC | Midland, TX 79702 | Oil Operator | May 2025 |
| 413 | Permian West Corp. | Odessa, TX 79762 | Oil & Gas Operator | May 2025 |
| 414 | Perry Producing Company, Inc. | Ackerly, TX 79713 | Oil & Gas Operator | May 2025 |
| 415 | Petro-West Corporation | Lubbock, TX 79404 | Oil & Gas Operator | Oct 2001 |
| 416 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 417 | Petrolegacy Energy II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2023 |
| 418 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 419 | Petroplex Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 420 | Petroplex Equipment, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2019 |
| 421 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 422 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 423 | Piedra Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2023 |
| 424 | Pinon Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2023 |
| 425 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 426 | Pitco Investments, LTD. | Scottsdale, AZ 85261 | Oil & Gas Operator | Jan 2013 |
| 427 | Pitts Energy Co. | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 428 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 429 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 430 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 431 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 432 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 433 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 434 | PPC Operating Company LLC | Houston, TX 77279 | Oil & Gas Operator | Jul 2019 |
| 435 | Prasad, Hari Production Co. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 436 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 437 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 438 | Prospctv Invstmnt & TRDG Co, LTD | Tulsa, OK 74170 | Oil & Gas Operator | May 2001 |
| 439 | Psi Production, Inc. | Tyler, TX 75702 | Gas Operator | Jan 1994 |
| 440 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |
| 441 | Purvis Operating Co. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 442 | Purvis, J. H. | Midland, TX 79702 | Oil & Gas Operator | Dec 1994 |
| 443 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2025 |
| 444 | Qstar Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2016 |
| 445 | Quay Valley, Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2007 |
| 446 | Queen Sand Operating Co. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 447 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 448 | R & R Oil & Gas LLC | Big Spring, TX 79720 | Oil & Gas Operator | Dec 2024 |
| 449 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 450 | R&R Resources Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2015 |
| 451 | R. K. G. Engineering, Inc. | Odessa, TX 79760 | Oil & Gas Operator | May 2025 |
| 452 | Radtke, D.E. & Associates, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2004 |
| 453 | Rafter T Resources LLC | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 454 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 455 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | May 2025 |
| 456 | Rand Oil & Gas Corp. | Houston, TX 77040 | Oil & Gas Operator | May 2025 |
| 457 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 458 | Rattler Midstream Operating LLC | Midland, TX 79701 | Oil Operator | May 2025 |
| 459 | RBJ & Associates, LP | Midland, TX 79707 | Oil Operator | Jan 2020 |
| 460 | RCW Oil Company | Forsan, TX 79733 | Oil & Gas Operator | Mar 2019 |
| 461 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 462 | Reef Exploration, Inc. (A-1) | Richardson, TX 75080 | Oil & Gas Operator | Oct 2006 |
| 463 | Regions Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 464 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 465 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | May 2025 |
| 466 | Resolute Natural Res. Co., LLC | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 467 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | May 2025 |
| 468 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 469 | Rising Star Petroleum, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Apr 2010 |
| 470 | Rittenhouse Oil & Gas Co. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 471 | RMB Operating LLC | Lubbock, TX 79493 | Oil & Gas Operator | May 2025 |
| 472 | Robertson Resources, Inc. | Midland, TX 79708 | Oil & Gas Operator | May 2025 |
| 473 | Rock Fish Operating LLC | McKinney, TX 75070 | Oil & Gas Operator | May 2025 |
| 474 | Roff Operating Company LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 475 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 476 | RSP Permian, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2018 |
| 477 | Rusk Co. Well Service Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 478 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | May 2025 |
| 479 | Sahara Operating Company | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 480 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 481 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 482 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 483 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 484 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | May 2025 |
| 485 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 486 | Santa Fe Exploration Company | Lubbock, TX 79408 | Oil & Gas Operator | Nov 1997 |
| 487 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 488 | Saxon Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Oct 2009 |
| 489 | Schlagal, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2016 |
| 490 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 491 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 492 | Seay Exploration, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2008 |
| 493 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | May 2025 |
| 494 | Ser E&P, Inc. | McKinney, TX 75069 | Oil & Gas Operator | May 2025 |
| 495 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | May 2025 |
| 496 | Shenandoah Petroleum Corporation | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 497 | Shirley, B. J. | Lawn, TX 79530 | Oil & Gas Operator | Mar 2008 |
| 498 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 499 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 500 | Smith & Marrs Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2021 |