| 601 | Resaca Operating Company | Houston, TX 77010 | Oil & Gas Operator | Sep 2013 |
| 602 | Resolute Natural Res. Co., LLC | Midland, TX 79706 | Oil & Gas Operator | Sep 2026 |
| 603 | Rhonda Operating Company | Midland, TX 79710 | Oil & Gas Operator | Aug 2017 |
| 604 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 605 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2026 |
| 606 | Richmond Drilling Company | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 607 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Sep 2026 |
| 608 | Ring Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 609 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 610 | RMR Operating, LLC | Plano, TX 75024 | Oil & Gas Operator | Sep 2026 |
| 611 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Sep 2026 |
| 612 | Roca Resource Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 613 | Rover Operating Inc | Richardson, TX 75080 | Oil & Gas Operator | Apr 2000 |
| 614 | Rowland, Rex D. | Midland, TX 79701 | Oil & Gas Operator | Dec 2017 |
| 615 | RSP Permian, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2018 |
| 616 | Rust Oil Corp. | Fort Worth, TX 76121 | Oil & Gas Operator | Sep 2026 |
| 617 | Ryann Operating, LLC | Waller, TX 77484 | Oil & Gas Operator | Sep 2026 |
| 618 | Saber Oil & Gas Ventures, LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 619 | Sabinal Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 620 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 621 | Saddleback Exploration, LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2024 |
| 622 | Saga Pet. LTD Liability Co Of Co | Midland, TX 79701 | Oil & Gas Operator | Apr 2004 |
| 623 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Sep 2026 |
| 624 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Sep 2026 |
| 625 | Saguaro Petroleum, LLC | Eastland, TX 76448 | Oil & Gas Operator | Sep 2026 |
| 626 | Sahara Operating Company | Midland, TX 79704 | Oil & Gas Operator | Sep 2026 |
| 627 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 628 | Samis Oil Company, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2000 |
| 629 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 630 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 631 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2026 |
| 632 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | May 2026 |
| 633 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Sep 2026 |
| 634 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 635 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 636 | Sarita Energy Resources, LTD. | Houston, TX 77277 | Oil & Gas Operator | Sep 2026 |
| 637 | Satanta Oil Company | Midland, TX 79704 | Oil & Gas Operator | Sep 2026 |
| 638 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 639 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 640 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Sep 2026 |
| 641 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 642 | Schlachter, David A., Estate Of | Dallas, TX 75225 | Oil & Gas Operator | Jan 2000 |
| 643 | Schlagal, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2016 |
| 644 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2026 |
| 645 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 646 | SDG Resources L.P. | Montrose, CO 81402 | Oil & Gas Operator | May 2006 |
| 647 | Seaboard Oil Company | Midland, TX 79710 | Oil & Gas Operator | Mar 2008 |
| 648 | Seaboard Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Sep 2026 |
| 649 | Seco Production Company | Midland, TX 79708 | Oil & Gas Operator | Aug 2003 |
| 650 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Jul 2026 |
| 651 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Sep 2026 |
| 652 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 653 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | May 2026 |
| 654 | Shifflett Operating Company | Snyder, TX 79550 | Oil & Gas Operator | Sep 2026 |
| 655 | Shinnery Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 656 | Siana Oil & Gas | Conroe, TX 77305 | Oil & Gas Operator | Sep 2026 |
| 657 | Silver Cross Energy Partners LLC | Richmond, TX 77469 | Oil & Gas Operator | Sep 2026 |
| 658 | Simpson Oil Company | Odessa, TX 79760 | Oil & Gas Operator | Oct 2004 |
| 659 | Slack, R. C. | Pecos, TX 79772 | Oil & Gas Operator | Jul 2000 |
| 660 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Sep 2026 |
| 661 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2026 |
| 662 | Smith & Marrs Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2021 |
| 663 | Sogo III LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2017 |
| 664 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Sep 2026 |
| 665 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 666 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 667 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2026 |
| 668 | Southwest-Operating | Penwell, TX 79776 | Oil & Gas Operator | Sep 2026 |
| 669 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Sep 2026 |
| 670 | St Johns Operating #1 LP | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 671 | St. Clair Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Mar 2008 |
| 672 | Stanolind Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2021 |
| 673 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 674 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | Sep 2026 |
| 675 | Stickney Oil & Gas, Inc. | Midland, TX 79704 | Oil & Gas Operator | Nov 2014 |
| 676 | Stickney, F. C., Inc. | Midland, TX 79704 | Oil & Gas Operator | Oct 1998 |
| 677 | Strata Petroleum Co. | Midland, TX 79701 | Oil & Gas Operator | May 1997 |
| 678 | Success Oil Company, Inc. | Beverly Hills, CA 90211 | Oil & Gas Operator | Sep 2026 |
| 679 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Sep 2026 |
| 680 | Summit Exploration, L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2008 |
| 681 | Sunday Corporation | Olney, TX 76374 | Oil & Gas Operator | Sep 2026 |
| 682 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Sep 2026 |
| 683 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 684 | Sunergon Oil Operating, LLC | Gainesville, TX 76240 | Oil Operator | Sep 2026 |
| 685 | Sunray Energy, Inc. | Round Rock, TX 78683 | Oil & Gas Operator | Nov 2018 |
| 686 | Swanson, Tommy Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Mar 2017 |
| 687 | T & D Oil | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2026 |
| 688 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2026 |
| 689 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 690 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 2026 |
| 691 | Tacor Resources Inc | Midland, TX 79705 | Oil & Gas Operator | Sep 2026 |
| 692 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 693 | Targa Midstream Services LLC | Tulsa, OK 74103 | Oil Operator | Mar 2023 |
| 694 | Targa Pipeline Mid-Continent LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2018 |
| 695 | Taurus Exploration U.S.A., Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 1998 |
| 696 | Taurus Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2026 |
| 697 | Tejas Trucking, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Sep 2026 |
| 698 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Sep 2026 |
| 699 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Sep 2026 |
| 700 | Texas Consolidated Pet. Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | Sep 2026 |