| 601 | Oso Resources LLC | Edmond, OK 73003 | Oil & Gas Operator | Apr 2026 |
| 602 | Osterhout Phillip L | Drumright, OK 74030-0693 | Oil & Gas Operator | Jan 2014 |
| 603 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | May 2026 |
| 604 | Pablo Energy II, LLC | Amarillo, TX 79105 | Oil & Gas Operator | May 2026 |
| 605 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 606 | Pacific Enterprises Royalty Co | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 607 | Pan Western Energy Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Jul 2026 |
| 608 | Panadero Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Apr 2002 |
| 609 | Panexco Operating LLC | Oklahoma City, OK 73103-2203 | Oil & Gas Operator | Oct 2014 |
| 610 | Pangaea Exploration Corp | Edmond, OK 73013 | Oil & Gas Operator | May 2019 |
| 611 | Papal Enterprises Inc | Oklahoma City, OK 73154-1555 | Oil & Gas Operator | Apr 2015 |
| 612 | Pardee Production Co. | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2021 |
| 613 | Parker & Parsley Dev Co | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 614 | Parsons Engineering Corporation | Tulsa, OK 74137-7505 | Oil & Gas Operator | Oct 2017 |
| 615 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 616 | Patina Oklahoma Corp | Duncan, OK 73533-9523 | Oil & Gas Operator | Nov 2014 |
| 617 | Payne Exploration Company | Crescent, OK 73028 | Oil & Gas Operator | Apr 2026 |
| 618 | Payne W C Family Trust | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Mar 2015 |
| 619 | Pearl Petroleum Inc | Lawton, OK 73501-5821 | Oil & Gas Operator | Jan 2014 |
| 620 | Pedestal Oil Company Inc | Oklahoma City, OK 73101-1522 | Oil & Gas Operator | May 2019 |
| 621 | Pegasus Energy Corporation | Oklahoma City, OK 73162 | Oil & Gas Operator | Mar 2015 |
| 622 | Pelican Production Company | New Orleans, LA 70130-2477 | Oil & Gas Operator | Mar 2014 |
| 623 | Penn VIrginia MC Operating Co LLC | Houston, TX 77084-7213 | Oil & Gas Operator | Sep 2025 |
| 624 | Pepin Oil Co | Stillwater, OK 74076 | Oil & Gas Operator | Oct 2013 |
| 625 | Performance Petroleum Company LLC | Barnsdall, OK 74002 | Oil & Gas Operator | Apr 2026 |
| 626 | Petro Davis Inc | Oklahoma City, OK 73142-1807 | Oil & Gas Operator | Jan 2013 |
| 627 | Petro Speed Inc | Norman, OK 73069-8116 | Oil & Gas Operator | Mar 2015 |
| 628 | Petro-Management Assoc., Inc. | Edmond, OK 73083-2346 | Oil & Gas Operator | Jun 2007 |
| 629 | Petroleum Properties MGMT. Co. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2014 |
| 630 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 631 | Petroleum Resources Co | Wichita, KS 67206 | Oil & Gas Operator | May 2000 |
| 632 | Petrolia Drilling Corporation | | Oil & Gas Operator | Jul 2003 |
| 633 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Jul 2026 |
| 634 | Phillips Oil Operating Co | Enid, OK 73703-4921 | Oil & Gas Operator | May 2019 |
| 635 | Plainsmen Energy LLC | Enid, OK 73703-5747 | Oil & Gas Operator | May 2026 |
| 636 | Plotner Oil Company | Oklahoma City, OK 73122 | Oil & Gas Operator | Apr 2026 |
| 637 | Plotner Ralph Oil & Gas Inv Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2021 |
| 638 | Post Oak Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2013 |
| 639 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Jul 2026 |
| 640 | Prairie Wind Oil LLC | Blackwell, OK 74647-7242 | Oil & Gas Operator | Apr 2026 |
| 641 | Prentice, Napier & Green, Inc. | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2026 |
| 642 | Presidio Petroleum LLC | Canadian, TX 79014 | Oil & Gas Operator | Jul 2026 |
| 643 | Presley Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 644 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2026 |
| 645 | Prime Energy Corp | Charleston, WV 25301-1707 | Oil & Gas Operator | Sep 2015 |
| 646 | Prime Operating Company | Midland, TX 79705 | Oil & Gas Operator | Jul 2026 |
| 647 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 648 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 649 | Producers Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |
| 650 | Providence Oil & Gas Corp | Tulsa, OK 74135-5463 | Oil & Gas Operator | May 2005 |
| 651 | Psec Inc | Tulsa, OK 74102-0871 | Oil & Gas Operator | Dec 2016 |
| 652 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 653 | Pyramid Energy Inc | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2012 |
| 654 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 655 | Quad J Oil & Gas LLC | Crescent, OK 73028 | Oil & Gas Operator | May 2026 |
| 656 | Quest Property Inc | Yukon, OK 73099 | Oil & Gas Operator | Apr 2026 |
| 657 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 658 | R & B Trucking | Crescent, OK 73028-0775 | Oil & Gas Operator | Nov 2021 |
| 659 | R & N Associates | Grapevine, TX 76051 | Oil & Gas Operator | Feb 2025 |
| 660 | R & N Oil Company | Fairfax, OK 74637 | Oil & Gas Operator | May 2013 |
| 661 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | May 2026 |
| 662 | R E Blaik Inc | Edmond, OK 73013-6675 | Oil & Gas Operator | Apr 2026 |
| 663 | R L Clampitt & Associates LLC | Bartlesville, OK 74006 | Oil & Gas Operator | May 2026 |
| 664 | Ra-Jac LLC | Norman, OK 73069 | Oil & Gas Operator | May 2026 |
| 665 | Rackley Oil & Gas, LLC | Balko, OK 73931 | Oil & Gas Operator | Apr 2026 |
| 666 | Rainwater A L | Okmulgee, OK 74447 | Oil & Gas Operator | Jan 2013 |
| 667 | Ram Asset Management Co | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 668 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 669 | Ramsey Engineering Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 1993 |
| 670 | Ramsey Nichols Operating Company LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Apr 2026 |
| 671 | Ramsey Property Management LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2026 |
| 672 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 673 | Randall E James Oil Company | Guthrie, OK 73044-9352 | Oil & Gas Operator | Apr 2026 |
| 674 | Randy Inc | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2026 |
| 675 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 676 | Ranken Energy Corporation | Edmond, OK 73013 | Oil & Gas Operator | Apr 2026 |
| 677 | Rapp Oil & Gas | Oklahoma City, OK 73120 | Gas Operator | Jul 2020 |
| 678 | Raw Crude Oil & Gas, L.L.C. | Norman, OK 73069 | Oil & Gas Operator | Apr 2026 |
| 679 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 680 | Rebellion Energy LLC | Tulsa, OK 74135-6241 | Oil & Gas Operator | Jun 2022 |
| 681 | Red Bluff Resources Operating LLC | Oklahoma City, OK 73112-5468 | Oil & Gas Operator | Apr 2026 |
| 682 | Red Eagle Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2005 |
| 683 | Red Fork (USA) Investments Inc | Midland, TX 79710-0272 | Oil & Gas Operator | May 2019 |
| 684 | Redland Development LLC | Cashion, OK 73016-9625 | Oil & Gas Operator | May 2019 |
| 685 | Redland Resources LLC | Oklahoma City, OK 73127 | Oil & Gas Operator | May 2026 |
| 686 | Redline Energy LLC | Dover, OK 73734 | Oil & Gas Operator | May 2026 |
| 687 | Redneck Oil & Gas LLC | Cushing, OK 74023 | Oil Operator | Apr 2026 |
| 688 | Reed Power Tongs Inc | Seminole, OK 74818 | Oil & Gas Operator | Apr 2026 |
| 689 | Regency Exploration Inc | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 1999 |
| 690 | Remo Production Co | Stillwater, OK 74074-9333 | Oil Operator | Apr 2014 |
| 691 | Renegade Oil And Gas LLC | Helena, OK 73741-0162 | Oil & Gas Operator | Dec 2019 |
| 692 | Republic Resources Corporation | Oklahoma City, OK 73102-3081 | Oil & Gas Operator | May 2021 |
| 693 | Reserve Acquisition Group | Tulsa, OK 74153 | Oil & Gas Operator | Dec 1993 |
| 694 | Resource Operations Inc | Tulsa, OK 74157 | Oil & Gas Operator | May 2016 |
| 695 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Apr 2026 |
| 696 | Review Oil & Gas Inc | Edmond, OK 73034-7648 | Oil & Gas Operator | Apr 2026 |
| 697 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 698 | Revolution Resources LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2023 |
| 699 | Rhoades Oil Co | Tulsa, OK 74136-5575 | Oil & Gas Operator | Aug 2013 |
| 700 | Rhodes-Fielding Corporation | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |