| 601 | Questa Oil & Gas Co. | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 602 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 603 | R. K. G. Engineering, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2026 |
| 604 | Rad Oil Company | Snyder, TX 79549 | Oil & Gas Operator | Apr 2026 |
| 605 | Ram Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2012 |
| 606 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 607 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Apr 2026 |
| 608 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 609 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 610 | Rasmussen, Hal J. Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 2009 |
| 611 | Rasmussen, Tom | San Angelo, TX 76904 | Oil & Gas Operator | Apr 2026 |
| 612 | Rayden | Southlake, TX 76092 | Oil & Gas Operator | Apr 2026 |
| 613 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 614 | Recovery Operating LP | San Angelo, TX 76904 | Oil & Gas Operator | Apr 2026 |
| 615 | Red Oak Energy Co | San Angelo, TX 76906 | Oil & Gas Operator | Apr 2026 |
| 616 | Red Stag Energy, LLC | Ozona, TX 76943 | Oil & Gas Operator | Jan 2022 |
| 617 | Red Stag Operating, LLC | Ozona, TX 76943 | Oil & Gas Operator | Apr 2026 |
| 618 | Red Tank Resources, LLC | Dallas, TX 75379 | Oil & Gas Operator | Apr 2026 |
| 619 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 620 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 621 | Regency Petroleum Co. Of New Mex | Coppell, TX 75019 | Oil & Gas Operator | Apr 2008 |
| 622 | Rein Pusher Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Apr 2026 |
| 623 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 624 | Reliance Operating Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 625 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 626 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Apr 2026 |
| 627 | Rendova Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2002 |
| 628 | Reverence Operating LLC | Odessa, TX 79768 | Oil & Gas Operator | Apr 2026 |
| 629 | Rhombus Operating Co., LTD | Littleton, CO 80160 | Oil & Gas Operator | Feb 2026 |
| 630 | Rhonda Operating Company | Midland, TX 79710 | Oil & Gas Operator | Aug 2017 |
| 631 | RHR Oil & Gas, LLC | Fort Worth, TX 76107 | Oil Operator | Apr 2026 |
| 632 | Rhyne, J.V. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2026 |
| 633 | Riata Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2006 |
| 634 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Feb 2026 |
| 635 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 636 | Ricks Expl Acquisition Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2004 |
| 637 | Ricks Expl Acquisition LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2013 |
| 638 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 639 | Ridgeline Resources, LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 640 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Apr 2026 |
| 641 | Rimrock Production Inc. | Giddings, TX 78942 | Oil & Gas Operator | Apr 2026 |
| 642 | Rio Blanco Energy, Inc. | Littleton, CO 80121 | Oil & Gas Operator | Oct 2002 |
| 643 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2026 |
| 644 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 645 | RMB Operating LLC | Lubbock, TX 79493 | Oil & Gas Operator | Apr 2026 |
| 646 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 647 | Roberts & Hammack, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Apr 2026 |
| 648 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Apr 2026 |
| 649 | Roc Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2013 |
| 650 | Roc Operating, Inc. | Plano, TX 75093 | Oil & Gas Operator | Oct 2008 |
| 651 | Roca Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 652 | Roca Resource Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 653 | Rocanville Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 654 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Apr 2026 |
| 655 | Rodman Petroleum Corp. | Odessa, TX 79768 | Oil & Gas Operator | Jul 2023 |
| 656 | Romine Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 657 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 658 | Rowland, Rex D. | Midland, TX 79701 | Oil & Gas Operator | Dec 2017 |
| 659 | Rowland, Rex D. Estate Of | Midland, TX 79705 | Oil & Gas Operator | Apr 2026 |
| 660 | Rozzlle Operating Company, LLC | Blackwell, TX 79506 | Oil & Gas Operator | Apr 2026 |
| 661 | RRP Operating LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 662 | Rudman Partnership, The | Dallas, TX 75201 | Oil & Gas Operator | Dec 2014 |
| 663 | Russell Operating Company, LLC | Big Lake, TX 76932 | Oil Operator | Apr 2026 |
| 664 | Ruwco Oil And Gas Corp. | Austin, TX 78701 | Oil & Gas Operator | Aug 2021 |
| 665 | S & C Construction, Inc. | Whitefish, MT 59937 | Oil & Gas Operator | Oct 2025 |
| 666 | S & P Energy | Benbrook, TX 76126 | Oil & Gas Operator | Oct 1994 |
| 667 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 668 | S2 Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2023 |
| 669 | Saber Oil & Gas Ventures, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 670 | Sable Permian Resources Land,LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2019 |
| 671 | Sable Permian Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2021 |
| 672 | Safari Production Company, Inc. | McAllen, TX 78501 | Oil & Gas Operator | Apr 2026 |
| 673 | Safemark Oil & Gas, LLC | McKinney, TX 75072 | Oil & Gas Operator | Apr 2026 |
| 674 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Apr 2026 |
| 675 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Apr 2026 |
| 676 | Sagebrush Oilandgas Company,LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2010 |
| 677 | Sahara Operating Company | Midland, TX 79704 | Oil & Gas Operator | Apr 2026 |
| 678 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 679 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 680 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 681 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 682 | Sandia Production Co., Inc. | Corrales, NM 87048 | Oil & Gas Operator | Apr 2026 |
| 683 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 684 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 685 | Sarita Energy Resources, LTD. | Houston, TX 77277 | Oil & Gas Operator | Apr 2026 |
| 686 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 687 | SBJ Oil & Gas, LLC | Iraan, TX 79744 | Oil & Gas Operator | Apr 2026 |
| 688 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 689 | Schlachter, David A., Estate Of | Dallas, TX 75225 | Oil & Gas Operator | Jan 2000 |
| 690 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Apr 2026 |
| 691 | SDMB Resources LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 692 | Seay Exploration, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2008 |
| 693 | Sed Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 694 | Sem Operating Company LLC | Houston, TX 77042 | Oil & Gas Operator | Apr 2026 |
| 695 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 696 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2026 |
| 697 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 698 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 699 | Sigma Energy & Explor., Co LLC | Ozona, TX 76943 | Oil & Gas Operator | Feb 2010 |
| 700 | Silver Oil & Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Apr 2026 |