| 601 | Red Stone Resources LLC | Edmond, OK 73013 | Oil Operator | Jun 2023 |
| 602 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 603 | Regions Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 604 | Reichmann Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Sep 2026 |
| 605 | Rein Pusher Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Sep 2026 |
| 606 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Sep 2026 |
| 607 | Renaud Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 608 | Resaca Operating Company | Houston, TX 77010 | Oil & Gas Operator | Sep 2013 |
| 609 | Reserve Management, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Sep 2026 |
| 610 | Resolute Natural Res. Co., LLC | Midland, TX 79706 | Oil & Gas Operator | Sep 2026 |
| 611 | RHB Exploration & Production,LLC | Grapevine, TX 76099 | Oil & Gas Operator | Sep 2026 |
| 612 | Rhonda Operating Company | Midland, TX 79710 | Oil & Gas Operator | Aug 2017 |
| 613 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 614 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 615 | Robert C. Brower, LLC | Southlake, TX 76092 | Oil & Gas Operator | Sep 2026 |
| 616 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Sep 2026 |
| 617 | Roc Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2013 |
| 618 | Roca Resource Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 619 | Rockin' D, LLC | Big Spring, TX 79720 | Oil & Gas Operator | Mar 2024 |
| 620 | Roden Oil Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2008 |
| 621 | Rodgers, William L. | Fort Worth, TX 76147 | Oil & Gas Operator | Jan 1995 |
| 622 | Roosth Production Co. | Tyler, TX 75711 | Oil & Gas Operator | Sep 2026 |
| 623 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 624 | Rover Petroleum Operating, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2026 |
| 625 | Royalty Land & Dev. Co., Inc. | Wolfforth, TX 79382 | Oil & Gas Operator | Sep 2026 |
| 626 | Royalty Resources, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 627 | RP Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 628 | RRCH Corp. | Longview, TX 75606 | Oil & Gas Operator | Dec 2013 |
| 629 | RRG Operating, LLC | Odessa, TX 79760 | Oil & Gas Operator | Sep 2026 |
| 630 | Ruwco Oil And Gas Corp. | Austin, TX 78701 | Oil & Gas Operator | Aug 2021 |
| 631 | Sabalo Operating, LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jun 2021 |
| 632 | Saber Oil & Gas Ventures, LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 633 | Saber Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2008 |
| 634 | Sabinal Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 635 | Saga Pet. LTD Liability Co Of Co | Midland, TX 79701 | Oil & Gas Operator | Apr 2004 |
| 636 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Sep 2026 |
| 637 | Sagebrush Oilandgas Company,LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2010 |
| 638 | Sahara Operating Company | Midland, TX 79704 | Oil & Gas Operator | Sep 2026 |
| 639 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 640 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 641 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 642 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | May 2026 |
| 643 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 644 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 645 | Satanta Oil Company | Midland, TX 79704 | Oil & Gas Operator | Sep 2026 |
| 646 | Satex Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2003 |
| 647 | Sayers Operating Company | Midland, TX 79705 | Oil & Gas Operator | Feb 2005 |
| 648 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Sep 2026 |
| 649 | Schlagal, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2016 |
| 650 | Scope Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2003 |
| 651 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2026 |
| 652 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 653 | SDG Resources L.P. | Montrose, CO 81402 | Oil & Gas Operator | May 2006 |
| 654 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 655 | Seay Exploration, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2008 |
| 656 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2026 |
| 657 | Sequoia Natural Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Sep 2026 |
| 658 | Shale Energy LLC | Jeffersonville, KY 40337 | Oil Operator | Dec 2018 |
| 659 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Sep 2026 |
| 660 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Sep 2026 |
| 661 | Shenandoah Oil, Inc. (I) | Midland, TX 79710 | Oil & Gas Operator | Apr 1996 |
| 662 | Shenandoah Petroleum Corporation | Midland, TX 79705 | Oil & Gas Operator | Sep 2026 |
| 663 | Shenandoah Resources LLC | Houston, TX 77086 | Oil & Gas Operator | Apr 2020 |
| 664 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | May 2026 |
| 665 | Sinclair Exploration Company | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 666 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Sep 2026 |
| 667 | Skeeter Oil L.L.C. | Big Spring, TX 79720 | Oil Operator | Sep 2026 |
| 668 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Sep 2026 |
| 669 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2026 |
| 670 | Smith & Marrs Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2021 |
| 671 | Smith Brothers Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 672 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Sep 2026 |
| 673 | Sogc, Inc. | Salt Lake Cty, UT 84131 | Oil & Gas Operator | Jun 2026 |
| 674 | Sogc, LLC | Salt Lake Cty, UT 84131 | Oil & Gas Operator | Sep 2026 |
| 675 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Sep 2026 |
| 676 | Sola Operating, LLC | Trout, LA 71371 | Oil Operator | Sep 2026 |
| 677 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 678 | Southstone Energy, LLC | Austin, TX 78735 | Oil Operator | Sep 2026 |
| 679 | Southwest Energy Devel.,Inc. | Sugar Land, TX 77478 | Oil & Gas Operator | Jul 2007 |
| 680 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2026 |
| 681 | Special JHR Corp | Bridgeville, PA 15017 | Oil & Gas Operator | Sep 2026 |
| 682 | Spirit O&G Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Sep 2026 |
| 683 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Sep 2026 |
| 684 | St. Cajetan Oil Company, LLC | Gainesville, TX 76240 | Oil & Gas Operator | Sep 2026 |
| 685 | St. Clair Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Mar 2008 |
| 686 | Staley Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Jan 2022 |
| 687 | Stasney, H. R. & Sons, LTD. | Albany, TX 76430 | Oil & Gas Operator | Sep 2026 |
| 688 | Statex Operating, LLC | Dallas, TX 75229 | Oil & Gas Operator | Mar 2007 |
| 689 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 690 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Apr 2021 |
| 691 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 692 | Sterling Oil And Gas LLC | Wichita Falls, TX 76310 | Oil Operator | Sep 2026 |
| 693 | Subsurface Energy Corp. | Coleman, TX 76834 | Oil & Gas Operator | Sep 2026 |
| 694 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Sep 2026 |
| 695 | Surge Operating, LLC | Houston, TX 77041 | Oil & Gas Operator | Sep 2026 |
| 696 | Sutton Oil Co. | San Antonio, TX 78254 | Oil & Gas Operator | Sep 2026 |
| 697 | Sweet Crude Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Sep 2026 |
| 698 | T.O.I. | Midland, TX 79710 | Oil & Gas Operator | Mar 2001 |
| 699 | Tahoe Exploration Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2016 |
| 700 | Tall City Operations LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2016 |