| 601 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 602 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 603 | Pal Kids Inc | Coronado, CA 92118 | Oil & Gas Operator | Nov 2000 |
| 604 | Paloma Operating Co Inc | Houston, TX 77002-5220 | Oil & Gas Operator | Dec 2024 |
| 605 | Panda Resources Inc | Tulsa, OK 74137-3536 | Oil & Gas Operator | Feb 1994 |
| 606 | Panenergy Services Inc | Houston, TX 77525 | Oil & Gas Operator | May 2001 |
| 607 | Panhandle Eastern Pipeline Company LP | Houston, TX 77002-6803 | Oil & Gas Operator | Oct 1999 |
| 608 | Panhandle Oil & Gas Consultants Inc | Woodward, OK 73802-5011 | Oil & Gas Operator | Jul 2015 |
| 609 | Panhandle Oilfield Service Companies Inc | Liberal, KS 67905-1256 | Oil Operator | Sep 2000 |
| 610 | Panhandle Trading Company | Houston, TX 77251-1642 | Oil & Gas Operator | Jun 2003 |
| 611 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2025 |
| 612 | Pardee Production Co. | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2021 |
| 613 | Park Avenue Exploration Corp | Oklahoma City, OK 73102-5604 | Oil & Gas Operator | Sep 2011 |
| 614 | Parker & Parsley Dev Co | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 615 | Parker & Parsley Dev LP | Irving, TX 75039-3745 | Oil & Gas Operator | Mar 2015 |
| 616 | Parwest Land Exploration, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Jan 2025 |
| 617 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 618 | Patina Oklahoma Corp | Duncan, OK 73533-9523 | Oil & Gas Operator | Nov 2014 |
| 619 | Patrick R J & Jack H Vaughn | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2002 |
| 620 | Patrick RJ Operating Co | Liberal, KS 67905-1157 | Oil & Gas Operator | Nov 2014 |
| 621 | Patton Dale | Stillwater, OK 74074 | Oil & Gas Operator | Dec 2011 |
| 622 | Payne Exploration Company | Crescent, OK 73028 | Oil & Gas Operator | Jan 2025 |
| 623 | Payne W C Family Trust | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Mar 2015 |
| 624 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 625 | Perkins Nova | Atwood, OK 74827-9738 | Oil Operator | Feb 2014 |
| 626 | Pet-Ex, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2024 |
| 627 | Petra Petroleum Inc | Littleton, CO 80160-0319 | Oil & Gas Operator | Jun 2005 |
| 628 | Petro Speed Inc | Norman, OK 73069-8116 | Oil & Gas Operator | Mar 2015 |
| 629 | Petro-Haley | Borger, TX 79008 | Oil & Gas Operator | Apr 2025 |
| 630 | Petro-Management Assoc., Inc. | Edmond, OK 73083-2346 | Oil & Gas Operator | Jun 2007 |
| 631 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 632 | Petroglyph Operating Co | Boise, ID 83709 | Oil & Gas Operator | Jul 2017 |
| 633 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 634 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 635 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 636 | Philcon Development Co. | Amarillo, TX 79101 | Oil & Gas Operator | Sep 2014 |
| 637 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Apr 2025 |
| 638 | Plains Liquids Transport Inc | Houston, TX 77002 | Oil & Gas Operator | May 1996 |
| 639 | Plains Marketing & Trans Inc | Houston, TX 76002 | Oil & Gas Operator | Oct 1998 |
| 640 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 641 | Poblano Energy LLC | Houston, TX 77024-2217 | Oil & Gas Operator | Jan 2025 |
| 642 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 643 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 644 | Polaris Energy Dev Co | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2000 |
| 645 | Pond David Well Service Inc Dba D W P Production | Perryton, TX 79070 | Gas Operator | Sep 2021 |
| 646 | Post Oak Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2013 |
| 647 | Post Petroleum Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Aug 2013 |
| 648 | PRDJ Cockrum Enterprises Inc | Okemah, OK 74859-5126 | Oil & Gas Operator | Mar 2022 |
| 649 | Premier Resources LTD | Denver, CO 80237 | Oil & Gas Operator | Jul 2002 |
| 650 | Prentice Napier & Green Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2025 |
| 651 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2025 |
| 652 | Primary Natural Resources III LLC | Tulsa, OK 74136-6351 | Oil & Gas Operator | Feb 2025 |
| 653 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 654 | Prime Energy Corp | Charleston, WV 25301-1707-1707 | Oil & Gas Operator | Sep 2015 |
| 655 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 656 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 657 | Princess Three Corporation | Henderson, TX 75653 | Oil & Gas Operator | Apr 2020 |
| 658 | Princess Three Operating, LLC | Henderson, TX 75653 | Oil & Gas Operator | Apr 2025 |
| 659 | Pringle Operating Co. | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2015 |
| 660 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 661 | Producers Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |
| 662 | Proex Energy Management, L.L.C. | Spring, TX 77386 | Oil & Gas Operator | Apr 2025 |
| 663 | Protege Energy II LLC | Tulsa, OK 74135-3252-3252 | Oil & Gas Operator | Dec 2013 |
| 664 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |
| 665 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Feb 2025 |
| 666 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 667 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 668 | Quail Creek Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 669 | Quail Creek Petro MGMT Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 670 | Quail Oil & Gas LC | Garden City, KS 67846 | Oil & Gas Operator | Jan 2025 |
| 671 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Jan 2025 |
| 672 | Questa Energy Corporation | Amarillo, TX 79159 | Oil & Gas Operator | Apr 2025 |
| 673 | Questa Oil & Gas Co. | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 674 | Questar Energy Trading | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2020 |
| 675 | R & A Moore, Inc. | Cleburne, TX 76033 | Oil & Gas Operator | Apr 2025 |
| 676 | R E Blaik Inc | Edmond, OK 73013-6675 | Oil & Gas Operator | Feb 2025 |
| 677 | Rama Operating Co., Inc. | Stafford, KS 67578 | Oil & Gas Operator | Feb 2025 |
| 678 | Ramco Energy Corporation | FT. Lauderdale, FL 33312 | Oil & Gas Operator | Dec 2008 |
| 679 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 680 | Ramsey Engineering Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 1993 |
| 681 | Ramsey Nichols Operating Company LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Feb 2025 |
| 682 | Ramsey Property Management LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Dec 2024 |
| 683 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 684 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 685 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 686 | Rasmussen, Hal J. Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 2009 |
| 687 | Ray G H Oil Company | Chickasha, OK 73023-0650 | Oil Operator | Feb 2010 |
| 688 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2025 |
| 689 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 690 | Red River Services LLC | Tulsa, OK 74136 | Gas Operator | Jan 2007 |
| 691 | Redland Resources, LLC | Oklahoma City, OK 73127 | Oil & Gas Operator | Feb 2025 |
| 692 | Redline Energy LLC | Dover, OK 73734 | Oil & Gas Operator | Feb 2025 |
| 693 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 694 | Reeder Energy Operating LLC | Dallas, TX 75206-4085 | Oil & Gas Operator | Dec 2021 |
| 695 | Remnant Energy, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Apr 2025 |
| 696 | Republic Energy Inc. | Decatur, TX 76234 | Oil & Gas Operator | Dec 2016 |
| 697 | Republic Resources Corporation | Oklahoma City, OK 73102-3081 | Oil & Gas Operator | May 2021 |
| 698 | Resource Dev Technology LLC | Morrison, CO 80465-5020 | Oil & Gas Operator | Jan 2017 |
| 699 | Resource Oil And Gas, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2025 |
| 700 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Jan 2025 |