| 501 | Pinon Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2023 |
| 502 | Pinon Petroleum, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Apr 2004 |
| 503 | Pintail Oil & Gas, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2019 |
| 504 | Pintail Production Co., Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Apr 2024 |
| 505 | Pintex Operating Inc. | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Feb 2005 |
| 506 | Pioneer Energy Corporation | Dallas, TX 75204 | Oil & Gas Operator | Apr 2024 |
| 507 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | Feb 2024 |
| 508 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Jan 2024 |
| 509 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 510 | Pioneer Natural Res. (GPC), Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 1998 |
| 511 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Apr 2024 |
| 512 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Dec 2023 |
| 513 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 514 | Pipeline Management, Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Dec 2002 |
| 515 | Pitchfork Investments, LLC | Amarillo, TX 79109 | Oil & Gas Operator | Apr 2024 |
| 516 | Pitchfork Oil & Gas, Inc. | Orchard, TX 77464 | Oil & Gas Operator | Apr 2024 |
| 517 | Pitco Investments, LTD. | Scottsdale, AZ 85261 | Oil & Gas Operator | Jan 2013 |
| 518 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 519 | Pittencrieff (Gulf Coast), Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1998 |
| 520 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 521 | Pitts Energy Co. | Midland, TX 79707 | Oil & Gas Operator | Apr 2024 |
| 522 | Pitts, Charles Company | Abilene, TX 79604 | Oil & Gas Operator | Dec 1997 |
| 523 | PK Gath & Oilfield SVCS, Inc. | Cleburne, TX 76031 | Oil & Gas Operator | Apr 2024 |
| 524 | PK Petroleum LLC | Pampa, TX 79065 | Oil & Gas Operator | Apr 2024 |
| 525 | PKS Energy Savers Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 1994 |
| 526 | Place Oil And Gas Co. | Eastland, TX 76448 | Oil & Gas Operator | Apr 2024 |
| 527 | Placer Oil Co. | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2008 |
| 528 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 529 | Placid Operating, LLC | Dallas, TX 75230 | Oil & Gas Operator | Jul 2021 |
| 530 | Plains Exploration & Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Jul 2013 |
| 531 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 532 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 533 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 534 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 535 | Planetierra Partnership | Sunray, TX 79086 | Oil & Gas Operator | Jan 2020 |
| 536 | Planetierra Three Partnership | Sunray, TX 79086 | Oil & Gas Operator | Apr 2024 |
| 537 | Plano Petroleum Corporation | McKinney, TX 75070 | Oil & Gas Operator | Dec 2023 |
| 538 | Plantation Operating Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Apr 2024 |
| 539 | Plantation Operating, LLC | Houston, TX 77041 | Oil & Gas Operator | Nov 2011 |
| 540 | Plateau Energy, LLC | Smyer, TX 79367 | Oil & Gas Operator | Dec 2022 |
| 541 | Platform Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 542 | Platinum Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 543 | Platinum Oil & Gas, L.L.C. | San Juan, TX 78589 | Oil & Gas Operator | Apr 2024 |
| 544 | Platinum Properties Inc. | Wichita Falls, TX 76301 | Oil Operator | Aug 2003 |
| 545 | Playa Minerals & Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2003 |
| 546 | Plemons Enterprises | Borger, TX 79008 | Oil & Gas Operator | Aug 1998 |
| 547 | Plo'S Oil & Gas | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Apr 2024 |
| 548 | Plover Production Company | Fort Worth, TX 76109 | Oil & Gas Operator | Jul 2006 |
| 549 | PLR Energy, LLC | Houston, TX 77079 | Oil Operator | May 2018 |
| 550 | Plumb Resources, Inc. | Houston, TX 77096 | Oil & Gas Operator | Jun 1998 |
| 551 | Plumley Company | Pampa, TX 79066 | Oil & Gas Operator | Mar 2022 |
| 552 | Plumley, M. C. & Associates | Borger, TX 79008 | Oil & Gas Operator | Apr 2024 |
| 553 | PM Oil & Gas, Inc. | San Angelo, TX 76903 | Oil Operator | Apr 2024 |
| 554 | PMB Energy, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Apr 2024 |
| 555 | Pmi Energy Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Aug 2002 |
| 556 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 557 | PMR Energy, LLC | San Antonio, TX 78209 | Oil Operator | Apr 2024 |
| 558 | PN Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2003 |
| 559 | PNG Operating Company | Oklahoma City, OK 73172 | Oil & Gas Operator | Apr 2024 |
| 560 | PNP Operating Company LLC | San Antonio, TX 78209 | Oil Operator | Apr 2024 |
| 561 | Pobres Incorporated | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2008 |
| 562 | Poco LLC | Houston, TX 77270 | Oil & Gas Operator | Apr 2024 |
| 563 | Poco Oil Co. | Houston, TX 77069 | Oil & Gas Operator | Mar 1997 |
| 564 | Poff, H. Bryan | Fort Worth, TX 76103 | Oil & Gas Operator | Mar 2008 |
| 565 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 566 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 567 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 568 | Pogue, Randall R. | Ada, OK 74820 | Oil & Gas Operator | May 2003 |
| 569 | Point Energy Partners Petro, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 570 | Polaris Enterprises Inc | Houston, TX 77057 | Oil & Gas Operator | Oct 1998 |
| 571 | Polaris Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 572 | Polaris Production Corp. | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 573 | Polk Petroleum, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 574 | Pomykal, Verde Oil Co | Brenham, TX 77833 | Oil & Gas Operator | Apr 2024 |
| 575 | Ponderosa Oil & Gas, LLC | Houston, TX 77008 | Oil & Gas Operator | Apr 2024 |
| 576 | Ponderosa TX Operating LLC | Stinnett, TX 79083 | Oil & Gas Operator | Apr 2024 |
| 577 | Ponta E&P LLP | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 578 | Pontotoc Oil Corp. | Midland, TX 79702 | Oil & Gas Operator | Feb 1996 |
| 579 | Pony Creek Operating LLC. | Flower Mound, TX 75028 | Oil Operator | Apr 2024 |
| 580 | Pony Express Corporate Trust | Aledo, TX 76008 | Oil & Gas Operator | Apr 2024 |
| 581 | Pony Oil Company | Borger, TX 79008 | Oil & Gas Operator | Jul 2001 |
| 582 | Pool, Lloyd Operating | Sandia Park, NM 87047 | Gas Operator | Dec 2013 |
| 583 | Poor Boy Operating Co. | Lubbock, TX 79403 | Oil Operator | Dec 2021 |
| 584 | Pop Operating Company | Denton, TX 76202 | Oil & Gas Operator | Apr 2024 |
| 585 | Porosity Oil LLC | Imperial, TX 79743 | Oil Operator | Apr 2024 |
| 586 | Portal Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Mar 1993 |
| 587 | Porter Operating Company, L.L.C. | Pampa, TX 79066 | Oil & Gas Operator | Apr 2024 |
| 588 | Porter, E. J. | Mingus, TX 76463 | Gas Operator | Jan 2011 |
| 589 | Porter, James W. | Houston, TX 77240 | Oil & Gas Operator | Oct 1993 |
| 590 | Porter, James W. Special | Blanco, TX 78606 | Oil & Gas Operator | Apr 2024 |
| 591 | Portfolio Oil Corporation | Oklahoma City, OK 73119 | Oil & Gas Operator | May 2013 |
| 592 | Post Oak Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2013 |
| 593 | Post Oak Operating, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 594 | Potato Creek, L.L.C. | Edna, KS 67342 | Oil & Gas Operator | Dec 2019 |
| 595 | Poteet Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 1994 |
| 596 | Powco Oil & Gas Co. | Athens, TX 75751 | Oil & Gas Operator | Feb 1995 |
| 597 | Powder River Resources, LLC | Archer City, TX 76351 | Oil & Gas Operator | Apr 2024 |
| 598 | Powell & Brown | Denver City, TX 79323 | Oil & Gas Operator | Mar 2008 |
| 599 | Powell Properties, Inc. | Los Altos, CA 94024 | Oil & Gas Operator | Apr 2024 |
| 600 | Powell, A. Brandt | Coleman, TX 76834 | Oil & Gas Operator | Mar 1999 |