| 601 | Pearl Oil Company | Nichols Hills, OK 73120-1408 | Oil & Gas Operator | Nov 2023 |
| 602 | Pegasus Energy Corporation | Oklahoma City, OK 73162 | Oil & Gas Operator | Mar 2015 |
| 603 | Pelican Production Company | New Orleans, LA 70130-2477 | Oil & Gas Operator | Mar 2014 |
| 604 | Penn VIrginia MC Operating Co LLC | Houston, TX 77084-7213 | Oil & Gas Operator | Sep 2025 |
| 605 | Pennmark Resources Company | Edmond, OK 73013 | Oil & Gas Operator | Apr 2026 |
| 606 | Perkins Energy Company | Duncan, OK 73533-3853 | Oil & Gas Operator | Apr 2026 |
| 607 | Perrin, Mary L | | Oil & Gas Operator | Oct 2005 |
| 608 | Petro Energy Inc | Farmington, NM 87499 | Oil & Gas Operator | Sep 2025 |
| 609 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 610 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 611 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 612 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 613 | Petroleum Investment Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 614 | Petroleum Management Prof Inc | Oklahoma City, OK 73120-1848 | Oil & Gas Operator | Apr 2009 |
| 615 | Petroleum Management, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jun 2026 |
| 616 | Petroleum Properties MGMT. Co. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2014 |
| 617 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 618 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Jun 2026 |
| 619 | Philcon Development Co. | Amarillo, TX 79101 | Oil & Gas Operator | Sep 2014 |
| 620 | Phillips Oil Operating Co | Enid, OK 73703-4921 | Oil & Gas Operator | May 2019 |
| 621 | Phoenix Oil & Gas Inc | Seminole, OK 74868 | Oil & Gas Operator | May 2025 |
| 622 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | Apr 2026 |
| 623 | Pioneer Of Oklahoma LP | Houston, TX 77090-3655 | Oil & Gas Operator | Mar 2026 |
| 624 | Piper Operating LLC | Stigler, OK 74462 | Oil & Gas Operator | Mar 2026 |
| 625 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 626 | Plainsmen Energy LLC | Enid, OK 73703-5747 | Oil & Gas Operator | Mar 2026 |
| 627 | Polaris Energy Dev Co | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2000 |
| 628 | Pollok Energy LLC | Tulsa, OK 74159 | Oil & Gas Operator | Mar 2026 |
| 629 | Pontotoc Operations Inc | Dallas, TX 75225-1425 | Oil & Gas Operator | Jun 2017 |
| 630 | Post Oak Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2013 |
| 631 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Jun 2026 |
| 632 | Premier Resources LTD | Denver, CO 80237 | Oil & Gas Operator | Jul 2002 |
| 633 | Prentice, Napier & Green, Inc. | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2026 |
| 634 | Preston Oil Co | Woodlands, TX 77380 | Oil & Gas Operator | Dec 2009 |
| 635 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Jun 2026 |
| 636 | Primary Natural Resources III LLC | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2026 |
| 637 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 638 | Prime Energy Corp | Charleston, WV 25301-1707 | Oil & Gas Operator | Sep 2015 |
| 639 | Prime Operating Company | Midland, TX 79705 | Oil & Gas Operator | Jun 2026 |
| 640 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 641 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 642 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |
| 643 | Psec Inc | Tulsa, OK 74102-0871 | Oil & Gas Operator | Dec 2016 |
| 644 | PT II LTD | | Oil & Gas Operator | Oct 2004 |
| 645 | Pyro Energy Corp | Kingwood, TX 77339-2102 | Oil & Gas Operator | Mar 1998 |
| 646 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2026 |
| 647 | Quad J Oil & Gas LLC | Crescent, OK 73028 | Oil & Gas Operator | Mar 2026 |
| 648 | Quantum Resources Management LLC | Houston, TX 77010 | Oil & Gas Operator | Mar 2026 |
| 649 | Questa Energy Corporation | Amarillo, TX 79159 | Oil & Gas Operator | Jun 2026 |
| 650 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 651 | R & D Reclaiming LLC | | Oil Operator | Aug 2022 |
| 652 | R A Miller Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Mar 2020 |
| 653 | R C Holdings LLC | Garber, OK 73738-5423 | Oil & Gas Operator | Oct 2025 |
| 654 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2026 |
| 655 | R E Blaik Inc | Edmond, OK 73013-6675 | Oil & Gas Operator | Apr 2026 |
| 656 | R3 Resources Operating Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Apr 2026 |
| 657 | Ra-Jac LLC | Norman, OK 73069 | Oil & Gas Operator | Mar 2026 |
| 658 | Rafter H Operating LLC | El Reno, OK 73036 | Oil & Gas Operator | Mar 2026 |
| 659 | Ram Asset Management Co | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 660 | Rambler Oil Co | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 1999 |
| 661 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 662 | Rampage Energy Inc | Bristow, OK 74010-6415 | Oil & Gas Operator | Apr 2020 |
| 663 | Ramsey Engineering Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 1993 |
| 664 | Ramsey Nichols Operating Company LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Apr 2026 |
| 665 | Ramsey Property Management LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2026 |
| 666 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 667 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 668 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2026 |
| 669 | Raw Crude Oil & Gas, L.L.C. | Norman, OK 73069 | Oil & Gas Operator | Mar 2026 |
| 670 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 671 | Reading & Bates Petroleum Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 672 | Red Bluff Resources Operating LLC | Oklahoma City, OK 73112-5468 | Oil & Gas Operator | Mar 2026 |
| 673 | Red Eagle Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2005 |
| 674 | Red Hawk Resources Inc | Edmond, OK 73003-3207 | Oil & Gas Operator | Apr 2026 |
| 675 | Red Plains Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Oct 2017 |
| 676 | Red Wolf Operating LLC | Edmond, OK 73003-2179 | Oil & Gas Operator | Apr 2026 |
| 677 | Redfork Operations LLC | Dover, OK 73734 | Oil & Gas Operator | Apr 2026 |
| 678 | Redland Resources LLC | Oklahoma City, OK 73127 | Oil & Gas Operator | Apr 2026 |
| 679 | Redline Energy LLC | Dover, OK 73734 | Oil & Gas Operator | Mar 2026 |
| 680 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 681 | Remora Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2026 |
| 682 | Replay Energy Assets LLC | Oklahoma City, OK 73156 | Oil & Gas Operator | Mar 2026 |
| 683 | Reserve Acquisition Group | Tulsa, OK 74153 | Oil & Gas Operator | Dec 1993 |
| 684 | Resource Oil And Gas, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2026 |
| 685 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Mar 2026 |
| 686 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 687 | Rio Blanco Operating LLC | Victoria, TX 77904 | Oil & Gas Operator | Mar 2026 |
| 688 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 689 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Apr 2026 |
| 690 | RMS Monte Christo, LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Mar 2023 |
| 691 | Roberson Oil Company | Houston, TX 77046 | Oil & Gas Operator | Mar 2026 |
| 692 | Robson Resources Inc | Tulsa, OK 74104 | Oil & Gas Operator | May 1998 |
| 693 | Rodman Petroleum Corp. | Odessa, TX 79768 | Oil & Gas Operator | Jul 2023 |
| 694 | Rox Exploration Inc | Norman, OK 73069-6301 | Oil & Gas Operator | Apr 2026 |
| 695 | Royalty Energy Development LLC | Edmond, OK 73003 | Oil & Gas Operator | Apr 2026 |
| 696 | RR Oil Well Operations LLC | Ringwood, OK 73768 | Oil & Gas Operator | Mar 2026 |
| 697 | RTC Resources, LLP | Weatherford, OK 73096 | Oil & Gas Operator | Jun 2026 |
| 698 | Rupe Oil Company Inc | Wichita, KS 67278 | Oil & Gas Operator | Feb 2026 |
| 699 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Mar 2026 |
| 700 | Ryder Scott Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2005 |