| 601 | Oklahoma Tank Service Inc | Oklahoma City, OK 73143 | Oil Operator | Aug 1997 |
| 602 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 603 | Oktex Operating LLC | Edmond, OK 73013-1961 | Oil & Gas Operator | May 2020 |
| 604 | Old Dominion Oil Corporation | Oklahoma City, OK 73107 | Oil & Gas Operator | Apr 2009 |
| 605 | Oneok Exploration Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 606 | Oneok Field Services Company | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2022 |
| 607 | Oneok Gas Transportation Co | Tulsa, OK 74121-2089 | Oil & Gas Operator | Oct 2014 |
| 608 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 609 | Otc/Occ Not Assigned | | Oil & Gas Operator | Nov 2023 |
| 610 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jan 2024 |
| 611 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | May 2024 |
| 612 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2024 |
| 613 | Ozark Gas Gathering LLC | Fort Smith, AR 72916 | Oil & Gas Operator | Jan 2024 |
| 614 | P O & G Operating LLC | Houston, TX 77057 | Oil & Gas Operator | May 2024 |
| 615 | Panther Operating LLC | Pauls Valley, OK 73075-0921 | Oil & Gas Operator | Feb 2024 |
| 616 | Pappe Court Jr | Kingfisher, OK 73750-0688 | Oil & Gas Operator | Nov 2001 |
| 617 | Paramore Oil Company | Duncan, OK 73533 | Oil & Gas Operator | Apr 2022 |
| 618 | Paramount Petroleum Corp | Dallas, TX 75374 | Oil Operator | Dec 2000 |
| 619 | Park William M | Skiatook, OK 74070-0718 | Oil & Gas Operator | Jan 2024 |
| 620 | Parrish Jr W F | Ardmore, OK 73401-2941 | Oil & Gas Operator | Jan 2024 |
| 621 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 622 | Patina Oklahoma Corp | Duncan, OK 73533-9523 | Oil & Gas Operator | Nov 2014 |
| 623 | Paul Burton LLC | Ardmore, OK 73401 | Oil & Gas Operator | Feb 2024 |
| 624 | Pawnee Petroleum Company | Seminole, OK 74868-0951 | Oil & Gas Operator | Feb 2023 |
| 625 | Pax Energy LLC | Oklahoma City, OK 73112-7371 | Oil Operator | Sep 2021 |
| 626 | Payne Charlie D | Lawton, OK 73505 | Oil & Gas Operator | May 2001 |
| 627 | PBT Enterprises Inc | Garber, OK 73738-0262 | Oil & Gas Operator | May 2023 |
| 628 | PCL Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 629 | Pelican Production Company | New Orleans, LA 70130-2477 | Oil & Gas Operator | Mar 2014 |
| 630 | Penner Energy Inc | Oklahoma City, OK 73120-1930 | Oil & Gas Operator | Feb 2024 |
| 631 | Pennzoil Company | Midland, TX 79710-0090 | Oil & Gas Operator | Mar 2000 |
| 632 | Pennzoil Explor & Prod Co | Houston, TX 77002 | Oil & Gas Operator | Mar 2000 |
| 633 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 634 | Perkins Energy Company | Duncan, OK 73533-3853 | Oil & Gas Operator | Feb 2024 |
| 635 | Perkins Mike | Velma, OK 73091 | Oil & Gas Operator | Jan 2006 |
| 636 | Perkins, Bobby R | | Oil Operator | Mar 2017 |
| 637 | Perkins, Earl | | Oil & Gas Operator | Aug 2013 |
| 638 | Petro Davis Inc | Oklahoma City, OK 73142-1807 | Oil & Gas Operator | Jan 2013 |
| 639 | Petro-Mac Corporation | Tulsa, OK 74101-3405 | Oil & Gas Operator | Jan 2024 |
| 640 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 641 | Petroda Oil & Gas LLC | Edmond, OK 73054 | Oil & Gas Operator | Feb 2023 |
| 642 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 643 | Petroleum Investment Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 644 | Petroleum Properties MGMT. Co. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2014 |
| 645 | PHD Oil & Gas Inc | Rush Springs, OK 73082-0218 | Oil & Gas Operator | May 2021 |
| 646 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 647 | Phillips Operating Co. | Mineral Wells, TX 76067 | Oil & Gas Operator | Jan 2013 |
| 648 | Phoenix Petrocorp, Inc. | McKinney, TX 75070 | Oil & Gas Operator | Feb 2024 |
| 649 | Phoenix Petroleum Co | | Oil Operator | Nov 2000 |
| 650 | Pickelsimer Kenny | Wilson, OK 73463-6502 | Oil & Gas Operator | Aug 2014 |
| 651 | Pierce O M Operations | Duncan, OK 73533 | Oil & Gas Operator | Nov 1998 |
| 652 | Pierce Patsey R The Estate Of | Duncan, OK 73533-4900 | Oil Operator | Mar 2007 |
| 653 | Piper Operating LLC | | Oil & Gas Operator | Feb 2024 |
| 654 | Pixley Carlis D | Marlow, OK 73055 | Oil & Gas Operator | Sep 1999 |
| 655 | Plains Liquids Transport Inc | Houston, TX 77002 | Oil & Gas Operator | May 1996 |
| 656 | Plains Marketing & Trans Inc | Houston, TX 76002 | Oil & Gas Operator | Oct 1998 |
| 657 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 658 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 659 | Pletcher Oil Limited Liability Company | Ardmore, OK 73401 | Oil & Gas Operator | Feb 2024 |
| 660 | Pogue Randall | Ada, OK 74821-1547 | Oil & Gas Operator | Apr 2014 |
| 661 | Poorboy Oil Inc | Velma, OK 73491-0811 | Oil & Gas Operator | Jul 2022 |
| 662 | Positive Energy LLC | | Oil & Gas Operator | Feb 2024 |
| 663 | Post Oak Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2013 |
| 664 | Powell Oil | Healdton, OK 73438-4463 | Oil & Gas Operator | Jan 2024 |
| 665 | Prairiedale Energy Inc | | Oil & Gas Operator | Feb 2024 |
| 666 | Preston Carter Oil Company | Davis, OK 73030-0276 | Oil & Gas Operator | Jan 2024 |
| 667 | Price Brothers Oil Co | Duncan, OK 73533 | Oil Operator | Feb 1996 |
| 668 | Price J R Inc | Addington, OK 73520-0099 | Oil & Gas Operator | Apr 2015 |
| 669 | Price, W. H. | Granbury, TX 76048 | Oil & Gas Operator | Feb 2024 |
| 670 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | May 2024 |
| 671 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 672 | Prime Energy Corp | Charleston, WV 25301-1707-1707 | Oil & Gas Operator | Sep 2015 |
| 673 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | May 2024 |
| 674 | Priority Holdings LLC | | Oil Operator | Feb 2024 |
| 675 | Producers Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |
| 676 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |
| 677 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Jan 2024 |
| 678 | Pruitt Operating Company LLC | Ratliff City, OK 73481-5802 | Oil & Gas Operator | Feb 2024 |
| 679 | Psec Inc | Tulsa, OK 74102-0871 | Oil & Gas Operator | Dec 2016 |
| 680 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Jan 2024 |
| 681 | Questar Energy Trading | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2020 |
| 682 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 683 | R & H LLC | Ardmore, OK 73401-6329 | Oil & Gas Operator | Mar 2015 |
| 684 | R & S Oil Company | Tonkawa, OK 74653 | Oil & Gas Operator | Nov 2013 |
| 685 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2024 |
| 686 | R L Turner Oil Company LLC | Duncan, OK 73533 | Oil Operator | Feb 2024 |
| 687 | Ra-Jac LLC | Norman, OK 73070-4656 | Oil & Gas Operator | Feb 2024 |
| 688 | Raizen Oil Company | Velma, OK 73091 | Oil & Gas Operator | Feb 2016 |
| 689 | Raizen Oil LLC | Duncan, OK 73533-4657 | Oil & Gas Operator | Nov 2003 |
| 690 | Ramsey Property Management LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Jan 2024 |
| 691 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 692 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 693 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2024 |
| 694 | Ranken Energy Corporation | Edmond, OK 73013 | Oil & Gas Operator | Jan 2024 |
| 695 | Rar Properties LLC | | Oil Operator | Feb 2024 |
| 696 | Rasmussen, Hal J. Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 2009 |
| 697 | Ratliff City Trucking Inc | Ratliff City, OK 73481-9603 | Oil & Gas Operator | Feb 2018 |
| 698 | Raven Resources LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Jan 2024 |
| 699 | Ray Herman | Haskell, OK 74436-0446 | Oil & Gas Operator | Dec 2021 |
| 700 | Raye Oil Company | Velma, OK 73491-0482 | Oil & Gas Operator | Oct 2012 |