| 501 | Piedra Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2023 |
| 502 | Pierce Junction Petroleum Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2010 |
| 503 | Pierce Operating Company, L.L.C. | Bryan, TX 77808 | Oil & Gas Operator | Dec 2018 |
| 504 | Pierce Production Company | Eunice, NM 88231 | Oil & Gas Operator | Oct 2012 |
| 505 | Pierce Production Company, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 506 | Pierce, Ray A. | Eunice, NM 88231 | Oil & Gas Operator | Nov 2004 |
| 507 | Pierco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Dec 2025 |
| 508 | Pierre Petroleum Corp. | Borger, TX 79007 | Oil & Gas Operator | Feb 1997 |
| 509 | Pikeco Inc | Whitesboro, TX 76273 | Oil & Gas Operator | Nov 2001 |
| 510 | Pilgrim Energy Partners L.L.C. | Fairfield, IL 62837 | Oil Operator | Dec 2025 |
| 511 | Pillans, Benjamin P. | Abilene, TX 79605 | Gas Operator | Aug 2012 |
| 512 | Pillar Efs, LLC | Dallas, TX 75204 | Oil & Gas Operator | Dec 2025 |
| 513 | Pillar Energy, LLC | Charleston, WV 25312-5987 | Oil & Gas Operator | Dec 2024 |
| 514 | Pillows, Burl A. | Houston, TX 77062 | Oil & Gas Operator | Dec 2025 |
| 515 | Pima Energy, LLC | Knott, TX 79748 | Oil & Gas Operator | Dec 2025 |
| 516 | Pine Creek Operating LLC | Colorado SPGS, CO 80903 | Oil & Gas Operator | Jul 2021 |
| 517 | Pine Island Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 518 | Pine Island Production Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2012 |
| 519 | Pine Ridge Operating, L.P. | Waelder, TX 78959 | Oil & Gas Operator | Dec 2025 |
| 520 | Pine Wave Energy Partners Op,LLC | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 521 | Pinewood Exploration Inc. | Arlington, TX 76096 | Oil & Gas Operator | Oct 2011 |
| 522 | Pinnacle Mining Corporation | Midland, TX 79708 | Oil & Gas Operator | Dec 2025 |
| 523 | Pinnacle Operating Company, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Dec 2025 |
| 524 | Pinon Corporation | San Antonio, TX 78266 | Oil & Gas Operator | Jul 2001 |
| 525 | Pinon Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2023 |
| 526 | Pinon Petroleum, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Apr 2004 |
| 527 | Pintail Oil & Gas, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2019 |
| 528 | Pintail Production Co., Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Dec 2025 |
| 529 | Pintex Operating Inc. | Corpus Chrsti, TX 78478 | Oil & Gas Operator | Feb 2005 |
| 530 | Pioneer Energy Corporation | Dallas, TX 75204 | Oil & Gas Operator | Dec 2025 |
| 531 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2025 |
| 532 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Oct 2025 |
| 533 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 534 | Pioneer Gas Pipeline, Inc. | San Angelo, TX 76903 | Oil & Gas Operator | Dec 2025 |
| 535 | Pioneer Natural Res. (GPC), Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 1998 |
| 536 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 537 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 538 | Pioneer Resources | Jefferson, CO 80456 | Oil Operator | Dec 2009 |
| 539 | Pioneer Resources Prod LP | Irving, TX 75039-3745 | Oil & Gas Operator | Feb 2005 |
| 540 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 541 | Pipeline Management, Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Dec 2002 |
| 542 | Pipeline Resources, Inc. | Corpus Chrsti, TX 78412 | Gas Operator | Aug 2003 |
| 543 | Pitchfork Investments, LLC | Amarillo, TX 79109 | Oil & Gas Operator | Dec 2025 |
| 544 | Pitchfork Oil & Gas, Inc. | Orchard, TX 77464 | Oil & Gas Operator | Dec 2025 |
| 545 | Pitco Investments, LTD. | Scottsdale, AZ 85261 | Oil & Gas Operator | Jan 2013 |
| 546 | Pitcock, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 547 | Pittencrieff (Gulf Coast), Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1998 |
| 548 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 549 | Pitts Energy Co. | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 550 | Pitts, Charles Company | Abilene, TX 79604 | Oil & Gas Operator | Dec 1997 |
| 551 | PK Gath & Oilfield SVCS, Inc. | Cleburne, TX 76031 | Oil & Gas Operator | Dec 2025 |
| 552 | PK Petroleum LLC | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 553 | PKS Energy Savers Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 1994 |
| 554 | Place Oil And Gas Co. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2025 |
| 555 | Placer Oil Co. | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2008 |
| 556 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 557 | Placid Operating, LLC | Dallas, TX 75230 | Oil & Gas Operator | Jul 2021 |
| 558 | Plains Exploration & Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Jul 2013 |
| 559 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 560 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 561 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 562 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 563 | Planetierra Three Partnership | Sunray, TX 79086 | Oil & Gas Operator | Dec 2025 |
| 564 | Plano Petroleum Corporation | McKinney, TX 75070 | Oil & Gas Operator | Jun 2025 |
| 565 | Plantation Operating Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Dec 2025 |
| 566 | Plantation Operating, LLC | Houston, TX 77041 | Oil & Gas Operator | Nov 2011 |
| 567 | Plateau Energy, LLC | Smyer, TX 79367 | Oil & Gas Operator | Dec 2023 |
| 568 | Platform Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 569 | Platinum Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 570 | Platinum Oil & Gas, L.L.C. | San Juan, TX 78589 | Oil & Gas Operator | Dec 2025 |
| 571 | Platinum Properties Inc. | Wichita Falls, TX 76301 | Oil Operator | Aug 2003 |
| 572 | Playa Minerals & Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Nov 2003 |
| 573 | Plemons Enterprises | Borger, TX 79008 | Oil & Gas Operator | Aug 1998 |
| 574 | Plo'S Oil & Gas | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Dec 2025 |
| 575 | Plover Production Company | Fort Worth, TX 76109 | Oil & Gas Operator | Jul 2006 |
| 576 | PLR Energy, LLC | Houston, TX 77079 | Oil Operator | May 2018 |
| 577 | Plumb Resources, Inc. | Houston, TX 77096 | Oil & Gas Operator | Jun 1998 |
| 578 | Plumley, M. C. & Associates | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 579 | PM Oil & Gas, Inc. | San Angelo, TX 76903 | Oil Operator | Dec 2025 |
| 580 | PMB Energy, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Dec 2025 |
| 581 | Pmi Energy Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Aug 2002 |
| 582 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 583 | PMR Energy, LLC | San Antonio, TX 78209 | Oil Operator | Dec 2025 |
| 584 | PN Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2003 |
| 585 | PNG Gathering, LLC | Wellington, TX 79095 | Oil & Gas Operator | Dec 2024 |
| 586 | PNG Operating Company | Oklahoma City, OK 73172 | Oil & Gas Operator | Dec 2025 |
| 587 | PNG Production, LLC | Wellington, TX 79095 | Oil & Gas Operator | Dec 2025 |
| 588 | PNP Operating Company LLC | San Antonio, TX 78230 | Oil Operator | Dec 2025 |
| 589 | Pobres Incorporated | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2008 |
| 590 | Poco LLC | Houston, TX 77270 | Oil & Gas Operator | Dec 2025 |
| 591 | Poco Oil Co. | Houston, TX 77069 | Oil & Gas Operator | Mar 1997 |
| 592 | Poff, H. Bryan | Fort Worth, TX 76103 | Oil & Gas Operator | Mar 2008 |
| 593 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 594 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 595 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 596 | Pogue, Randall R. | Ada, OK 74820 | Oil & Gas Operator | May 2003 |
| 597 | Point Energy Partners Petro, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 598 | Polaris Enterprises Inc | Houston, TX 77057 | Oil & Gas Operator | Oct 1998 |
| 599 | Polaris Operating, LLC | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 600 | Polaris Production Corp. | Midland, TX 79702 | Oil & Gas Operator | Jan 2024 |