| 601 | Petroleum International, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2000 |
| 602 | Petroleum Management, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Apr 2025 |
| 603 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Apr 2025 |
| 604 | PHD Oil & Gas Inc | Rush Springs, OK 73082-0218 | Oil & Gas Operator | May 2021 |
| 605 | Phoenix Petrocorp, Inc. | McKinney, TX 75070 | Oil & Gas Operator | Feb 2025 |
| 606 | Pierce O M Operations | Duncan, OK 73533 | Oil & Gas Operator | Nov 1998 |
| 607 | Pierce Patsey R The Estate Of | Duncan, OK 73533-4900 | Oil Operator | Mar 2007 |
| 608 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | Feb 2025 |
| 609 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Apr 2025 |
| 610 | Plains Liquids Transport Inc | Houston, TX 77002 | Oil & Gas Operator | May 1996 |
| 611 | Plains Marketing & Trans Inc | Houston, TX 76002 | Oil & Gas Operator | Oct 1998 |
| 612 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 613 | Pletcher Oil Limited Liability Company | Ardmore, OK 73401 | Oil & Gas Operator | Feb 2025 |
| 614 | Poblano Energy LLC | Houston, TX 77024-2217 | Oil & Gas Operator | Jan 2025 |
| 615 | Polaris Energy Dev Co | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2000 |
| 616 | Positive Energy LLC | Ada, OK 74820 | Oil & Gas Operator | Feb 2025 |
| 617 | Post Oak Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2013 |
| 618 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2025 |
| 619 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 620 | Prime Energy Corp | Charleston, WV 25301-1707-1707 | Oil & Gas Operator | Sep 2015 |
| 621 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 622 | Prospective Investment & Trading | Scottsdale, AZ 85261-4190 | Oil & Gas Operator | Jun 2016 |
| 623 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Feb 2025 |
| 624 | Providence Oil & Gas Corp | Tulsa, OK 74135-5463 | Oil & Gas Operator | May 2005 |
| 625 | Pulliam Melvin | Mannford, OK 74044 | Oil & Gas Operator | Jul 2019 |
| 626 | Pyramid Energy Inc | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2012 |
| 627 | Pyramid Oil Of America, Inc. | Nichols Hill, OK 73116 | Oil & Gas Operator | Jan 2025 |
| 628 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 629 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Jan 2025 |
| 630 | Questar Energy Trading | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2020 |
| 631 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 632 | R & B Trucking | Crescent, OK 73028-0775 | Oil & Gas Operator | Nov 2021 |
| 633 | R & N Associates | Grapevine, TX 76051 | Oil & Gas Operator | Jan 2025 |
| 634 | R D T Properties | Tulsa, OK 74105-7122 | Oil & Gas Operator | Sep 2017 |
| 635 | R.D. Oil Company | Austin, TX 78755 | Oil & Gas Operator | Apr 2025 |
| 636 | Raker Resources LLC | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 637 | Ram Asset Management Co | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 638 | Ramsey Property Management LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Dec 2024 |
| 639 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 640 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 641 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 642 | Raven Petroleum Inc | Oklahoma City, OK 73120 | Oil Operator | Jan 1997 |
| 643 | Raw Crude Oil & Gas LLC | Norman, OK 73069 | Oil & Gas Operator | Feb 2025 |
| 644 | Ray G H Oil Company | Chickasha, OK 73023-0650 | Oil Operator | Feb 2010 |
| 645 | Real Production Management LLC | Elmore City, OK 73433 | Oil Operator | Jan 2025 |
| 646 | Rebellion Energy LLC | Tulsa, OK 74135-6241 | Oil & Gas Operator | Jun 2022 |
| 647 | Red Hawk Resources Inc | Edmond, OK 73003-3207 | Oil & Gas Operator | Feb 2025 |
| 648 | Red River Crude Oil LLC | Houston, TX 77081 | Oil Operator | Jan 2025 |
| 649 | Red River Oil & Gas Company | Oklahoma City, OK 73132-5120 | Oil & Gas Operator | Mar 2015 |
| 650 | Red Rocks Oil & Gas Operating LLC | Oklahoma City, OK 73103-4821 | Oil & Gas Operator | Feb 2025 |
| 651 | Red Wolf Operating LLC | Edmond, OK 73003-2179 | Oil & Gas Operator | Feb 2025 |
| 652 | Redhill Operating LLC | Duncan, OK 73533 | Oil & Gas Operator | Feb 2025 |
| 653 | Redland Resources, LLC | Oklahoma City, OK 73127 | Oil & Gas Operator | Feb 2025 |
| 654 | Reeves Harold D | | Oil & Gas Operator | Apr 1992 |
| 655 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Jan 2025 |
| 656 | Revolution Operating Company,LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2024 |
| 657 | Revolution Resources LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2023 |
| 658 | Ricks Expl Acquisition Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2004 |
| 659 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 660 | Riley Lee Roy | Chickasha, OK 73018-9306 | Oil & Gas Operator | May 2006 |
| 661 | Rimrock Resource Operating LLC | Tulsa, OK 74103-4462 | Oil & Gas Operator | Jan 2025 |
| 662 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 663 | RMS Monte Christo, LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Mar 2023 |
| 664 | Roan Resources LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Apr 2024 |
| 665 | Roberts & Murphy, Inc. | Shreveport, LA 71137 | Oil & Gas Operator | Apr 2016 |
| 666 | Robinson Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Aug 2012 |
| 667 | Rocky Roads Operating LLC | Tulsa, OK 74103-4048 | Oil & Gas Operator | Feb 2025 |
| 668 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 669 | Roka Management Inc | Oklahoma City, OK 73139 | Oil & Gas Operator | Feb 2025 |
| 670 | Rose Rock Resources Inc | Wagoner, OK 74467-8362 | Oil & Gas Operator | Jan 2025 |
| 671 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2025 |
| 672 | RPM Oilfield Services LLC | Lindsay, OK 73052-8005 | Oil & Gas Operator | Jan 2025 |
| 673 | Rupe Oil Company, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Dec 2024 |
| 674 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Jan 2025 |
| 675 | S & G Operating LLC | McLoud, OK 74851 | Oil & Gas Operator | Jan 2025 |
| 676 | S & H Tank Service Of Okla | Lindsay, OK 73052 | Oil & Gas Operator | Mar 2017 |
| 677 | S & S Star Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2023 |
| 678 | S N D Energy Company, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Apr 2025 |
| 679 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 680 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 681 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 682 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 683 | San Marco Petroleum Inc | Denver, CO 80293 | Oil & Gas Operator | Mar 2025 |
| 684 | Sand Point Production Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Jan 2025 |
| 685 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Apr 2025 |
| 686 | Sanguine Gas Exploration, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2025 |
| 687 | Sanook Inc | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Jan 2007 |
| 688 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 689 | Santa Rita Resources Inc & Subs | | Oil & Gas Operator | Mar 2015 |
| 690 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 691 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 692 | Scana Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2005 |
| 693 | Scissortail Exploration And Production LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2025 |
| 694 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Apr 2025 |
| 695 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 696 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 697 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 698 | Sears M N | Oklahoma City, OK 73143 | Oil & Gas Operator | Apr 2015 |
| 699 | Sequent Exploration Inc | | Oil & Gas Operator | Oct 2017 |
| 700 | Seventy-One Inc | | Oil & Gas Operator | May 1999 |