| 501 | Pcore Exploration & Prod II LLC | Golden, CO 80401 | Oil & Gas Operator | Jun 2020 |
| 502 | PDC Energy | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 503 | PDC-WV-Co Corporation | Denver, CO 80203 | Oil & Gas Operator | Aug 2010 |
| 504 | Pecos Operators, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1993 |
| 505 | Ped Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 506 | Pen-Tex Production Co. Inc. | Penwell, TX 79776 | Oil & Gas Operator | Apr 2025 |
| 507 | Pen-Tex Production Co. L.L.C. | Penwell, TX 79776 | Oil & Gas Operator | Nov 1998 |
| 508 | Penergy | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 509 | Pennant Dev. And Prod., LLC | Midland, TX 79702 | Oil Operator | Apr 2025 |
| 510 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 511 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 512 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Feb 2025 |
| 513 | Penwell Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 514 | Penwell South Operating LLC | Houston, TX 77269 | Oil Operator | Apr 2025 |
| 515 | Permian Resources Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 516 | Permian Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 517 | Permian Services Co., LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2013 |
| 518 | Permian Solutions LLC | Midland, TX 79702 | Oil Operator | Apr 2025 |
| 519 | Petex | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 520 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 521 | Petroleum Technical Services Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2004 |
| 522 | Petromining, Inc. | Plano, TX 75026 | Oil & Gas Operator | Apr 2025 |
| 523 | Petroplex Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 524 | Petroplex Equipment, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2019 |
| 525 | Pfog Operations, LLC | Midland, TX 79710 | Oil Operator | Apr 2025 |
| 526 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Apr 2025 |
| 527 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 528 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 529 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 530 | Piedra Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2023 |
| 531 | Pinnacle Mining Corporation | Midland, TX 79708 | Oil & Gas Operator | Apr 2025 |
| 532 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | Feb 2025 |
| 533 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Apr 2025 |
| 534 | Pitco Investments, LTD. | Scottsdale, AZ 85261 | Oil & Gas Operator | Jan 2013 |
| 535 | Pitts Energy Co. | Midland, TX 79707 | Oil & Gas Operator | Apr 2025 |
| 536 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 537 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 538 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 539 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 540 | Platinum Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 541 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 542 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 543 | Prairie Crude, Inc. | Midland, TX 79704 | Oil & Gas Operator | Jan 2005 |
| 544 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2025 |
| 545 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 546 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 547 | Pro- Gas, Inc. | Midland, TX 79711 | Oil & Gas Operator | Apr 2025 |
| 548 | Probity Operating, LLC | Midland, TX 79708 | Oil & Gas Operator | Jul 2014 |
| 549 | Production Gathering Company, LP | Dallas, TX 75206 | Oil & Gas Operator | Apr 2025 |
| 550 | Pronghorn Management Corporation | Hobbs, NM 88241 | Oil & Gas Operator | Apr 2025 |
| 551 | Prospctv Invstmnt & TRDG Co, LTD | Tulsa, OK 74170 | Oil & Gas Operator | May 2001 |
| 552 | Prosper Oil & Gas,Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 553 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |
| 554 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 555 | Qualia, C. F. Operating,Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2013 |
| 556 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Jan 2025 |
| 557 | Quay Valley, Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2007 |
| 558 | Questa Oil & Gas Co. | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 559 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 560 | R. K. G. Engineering, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2025 |
| 561 | R.K.G. Operations, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Jun 2004 |
| 562 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 563 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 564 | Raptor Petroleum Develop, LLC | Edmond, OK 73034 | Oil & Gas Operator | Apr 2025 |
| 565 | Raptor Resources, Inc. | Austin, TX 78701 | Oil & Gas Operator | Apr 2025 |
| 566 | Rasmussen, Hal J. Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 2009 |
| 567 | Rasmussen, Tom | San Angelo, TX 76904 | Oil & Gas Operator | Apr 2025 |
| 568 | Rattler Midstream Operating LLC | Midland, TX 79701 | Oil Operator | Apr 2025 |
| 569 | RBD-Shelby Agency | Dallas, TX 75283 | Oil & Gas Operator | Dec 1993 |
| 570 | RBJ & Associates, LP | Midland, TX 79707 | Oil Operator | Jan 2020 |
| 571 | Rci, L.L.C. | Abilene, TX 79606 | Oil & Gas Operator | Apr 2025 |
| 572 | Reata Resources | Kermit, TX 79745 | Oil & Gas Operator | Sep 2007 |
| 573 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 574 | Redco Oil & Gas, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Apr 2025 |
| 575 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 576 | Reeves County Systems, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Aug 2019 |
| 577 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 578 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 579 | Rein Pusher Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Apr 2025 |
| 580 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 581 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Apr 2025 |
| 582 | Rendova Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2002 |
| 583 | Resaca Operating Company | Houston, TX 77010 | Oil & Gas Operator | Sep 2013 |
| 584 | Resolute Natural Res. Co., LLC | Midland, TX 79706 | Oil & Gas Operator | Apr 2025 |
| 585 | Rhonda Operating Company | Midland, TX 79710 | Oil & Gas Operator | Aug 2017 |
| 586 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 587 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2025 |
| 588 | Richmond Drilling Company | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 589 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Apr 2025 |
| 590 | Ring Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 591 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 592 | RMR Operating, LLC | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 593 | Robertson Resources, Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2025 |
| 594 | Roca Resource Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 595 | Rover Operating Inc | Richardson, TX 75080 | Oil & Gas Operator | Apr 2000 |
| 596 | Rowland, Rex D. | Midland, TX 79701 | Oil & Gas Operator | Dec 2017 |
| 597 | RSP Permian, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2018 |
| 598 | Rust Oil Corp. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2025 |
| 599 | Ryann Operating, LLC | Waller, TX 77484 | Oil & Gas Operator | Apr 2025 |
| 600 | Saber Oil & Gas Ventures, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |