| 601 | Romines & Warner | Pampa, TX 79065 | Oil & Gas Operator | Jan 2002 |
| 602 | Romines Operating Group | Pampa, TX 79066 | Oil & Gas Operator | Nov 2022 |
| 603 | Rominger, R.L. | Wichita Falls, TX 76307 | Oil & Gas Operator | Jan 2015 |
| 604 | Ronde Operating, LLC | Houston, TX 77006 | Oil & Gas Operator | Mar 2021 |
| 605 | Ronning Gas And Oil LLC | Mesa, AZ 85203 | Oil & Gas Operator | Dec 2025 |
| 606 | Roome Exploration Company | Bartlett, TX 76511 | Oil & Gas Operator | Mar 2008 |
| 607 | Roome Oil Co. | Bartlett, TX 76511 | Oil & Gas Operator | Dec 2025 |
| 608 | Roon Energy, Inc. | Dickinson, TX 77539 | Oil Operator | Dec 2025 |
| 609 | Roosevelt Resources LP | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 610 | Rooster Production, LLC | Oil City, LA 71061 | Oil Operator | Jan 2025 |
| 611 | Roosth & Genecov Production Co. | Tyler, TX 75710 | Oil & Gas Operator | Aug 2003 |
| 612 | Roosth Production Co. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 613 | Ropa Exploration Corp. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2011 |
| 614 | Ropar Operating Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 2025 |
| 615 | Rorico Oil Company | Argyle, TX 76226 | Oil & Gas Operator | Dec 2025 |
| 616 | Rosbottom Production Corp | Shreveport, LA 71134 | Oil & Gas Operator | Dec 2017 |
| 617 | Rose City Resources, LLC | Tyler, TX 75703 | Oil & Gas Operator | Dec 2025 |
| 618 | Rose Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Feb 2002 |
| 619 | Rosehill Operating Company, LLC | Houston, TX 77084 | Oil & Gas Operator | Sep 2021 |
| 620 | Roseland Oil & Gas Inc | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2003 |
| 621 | Rosenthal, Stanley H. | Bay City, TX 77404 | Oil & Gas Operator | Dec 2020 |
| 622 | Rosetta Energy Partners, L P | Dallas, TX 75219 | Oil & Gas Operator | Jul 2009 |
| 623 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2025 |
| 624 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 625 | Roskydal, Laverne | La Vernia, TX 78121 | Oil Operator | Dec 2025 |
| 626 | Rosner, S. | San Antonio, TX 78216 | Oil & Gas Operator | Aug 1996 |
| 627 | Ross Engineering, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Dec 2025 |
| 628 | Ross Exploration,Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2013 |
| 629 | Ross Gas And Oil, LTD. Co. | Dripping SPGS, TX 78620 | Oil & Gas Operator | Dec 2025 |
| 630 | Ross Operating Company | Shreveport, LA 71163 | Oil & Gas Operator | May 1996 |
| 631 | Ross Production Co. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 632 | Ross, Dwight M. DRLG. Co., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 2025 |
| 633 | Ross-Rippy | Tyler, TX 75702 | Oil & Gas Operator | Oct 2002 |
| 634 | Rosson, Robert K. | Novice, TX 79538 | Oil & Gas Operator | Aug 2003 |
| 635 | Roswell Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2019 |
| 636 | Rotation, Incorporated | Houston, TX 77057 | Oil & Gas Operator | Mar 2023 |
| 637 | Rough Creek Exploration, Inc. | Santa Anna, TX 76878 | Oil & Gas Operator | Jan 1996 |
| 638 | Rough Hollow Ranch Corporation | Dallas, TX 75209 | Oil Operator | Aug 2006 |
| 639 | Roule Production Company | Bay City, TX 77414 | Oil & Gas Operator | Feb 1997 |
| 640 | Round Rock Resources, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Sep 2012 |
| 641 | Routh Operating, LLC | Dallas, TX 75204 | Oil & Gas Operator | Mar 2011 |
| 642 | Rover Operating Company, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 643 | Rover Operating Inc | Richardson, TX 75080 | Oil & Gas Operator | Apr 2000 |
| 644 | Rover Petroleum Operating, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2025 |
| 645 | Rowan, Al | Van, TX 75790 | Oil & Gas Operator | Apr 2021 |
| 646 | Rowan-Ungerecht, Inc. | Van, TX 75790 | Oil & Gas Operator | Sep 1993 |
| 647 | Rowden Oil & Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2023 |
| 648 | Rowland Tank Truck Company | Whitewright, TX 75491 | Oil & Gas Operator | Dec 2025 |
| 649 | Rowland, Rex D. | Midland, TX 79701 | Oil & Gas Operator | Dec 2017 |
| 650 | Rowland, Rex D. Estate Of | Dallas, TX 75252 | Oil & Gas Operator | Dec 2025 |
| 651 | Rox Exploration Inc | Norman, OK 73069-6301 | Oil & Gas Operator | Sep 2025 |
| 652 | Roxanna Oil Company | Oklahoma City, OK 73120-2717 | Oil Operator | Aug 2016 |
| 653 | Roxi Production | Pampa, TX 79065 | Oil & Gas Operator | Dec 2025 |
| 654 | Roy Jackson Energy Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 655 | Roy Production Co. | Shamrock, TX 79079 | Oil & Gas Operator | Jul 2012 |
| 656 | Royal American Oil & Gas | Post, TX 79356 | Oil & Gas Operator | Jan 2019 |
| 657 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 658 | Royal Oil LTD. Co. | Hobbs, NM 88241 | Oil & Gas Operator | Mar 1996 |
| 659 | Royal Petroleum | Baytown, TX 77521 | Oil & Gas Operator | Aug 2003 |
| 660 | Royal Petroleum Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Dec 2025 |
| 661 | Royal Petroleum Corp. | Dallas, TX 75229 | Oil & Gas Operator | Jan 2025 |
| 662 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2025 |
| 663 | Royal Seahorse Developments Inc | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1994 |
| 664 | Royal Texan Energy Co. | Irvine, CA 92618 | Oil & Gas Operator | Dec 2025 |
| 665 | Royal Texan Resources Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 666 | Royal Texas Petroleum | Lago VIsta, TX 78645 | Oil & Gas Operator | Dec 2025 |
| 667 | Royale Operating Company | San Diego, CA 92108 | Oil & Gas Operator | Apr 1996 |
| 668 | Royalty Land & Dev. Co., Inc. | Wolfforth, TX 79382 | Oil & Gas Operator | Dec 2025 |
| 669 | Royalty Operating, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Nov 2007 |
| 670 | Royalty Resources, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 671 | Royko Oil Company | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2025 |
| 672 | Rozzlle Operating Company, LLC | Blackwell, TX 79506 | Oil & Gas Operator | Dec 2025 |
| 673 | RP Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 674 | RPG Operating LLC | MC Queeney, TX 78123 | Oil Operator | Dec 2025 |
| 675 | RPM Operating Company | New Braunfels, TX 78131 | Oil & Gas Operator | Mar 2008 |
| 676 | RPM Petroleum, LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Apr 2013 |
| 677 | RR Ventures Limited Partnership | San Antonio, TX 78239 | Oil & Gas Operator | Dec 2025 |
| 678 | RRCH Corp. | Longview, TX 75606 | Oil & Gas Operator | Dec 2013 |
| 679 | RRG Operating, LLC | Odessa, TX 79760 | Oil & Gas Operator | Dec 2025 |
| 680 | Rrig Exploration, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 681 | RRP Operating LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 682 | RRR Exploration, Inc. | Dallas, TX 75247 | Oil & Gas Operator | May 1994 |
| 683 | RSD Minerals LLC | Wichita, KS 67206 | Oil Operator | Jun 2025 |
| 684 | Rse, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2000 |
| 685 | RSP Permian, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2018 |
| 686 | RTC Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 687 | RTC Resources, LLP | Weatherford, OK 73096 | Oil & Gas Operator | Dec 2025 |
| 688 | RTD Inc | Bartlesville, OK 74006 | Oil Operator | Jan 1995 |
| 689 | RTD Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 690 | Rto Operating, LLC | San Antonio, TX 78212 | Oil Operator | Feb 2016 |
| 691 | RTZ Energy, LLC | Kilgore, TX 75663 | Gas Operator | Apr 2006 |
| 692 | Rubicon Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 693 | Rubis Oil, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 694 | Ruby Operating Company, Inc | Clyde, TX 79510 | Oil & Gas Operator | Dec 2025 |
| 695 | Rucker, Gary | Archer City, TX 76351 | Oil & Gas Operator | Dec 2003 |
| 696 | Ruckus Energy Operating, LLC | San Antonio, TX 78257 | Oil & Gas Operator | Dec 2025 |
| 697 | Rudman Partnership, The | Dallas, TX 75201 | Oil & Gas Operator | Dec 2014 |
| 698 | Ruff | Albany, TX 76430 | Oil & Gas Operator | Aug 2017 |
| 699 | Ruff Drilling Company | Albany, TX 76430 | Oil & Gas Operator | Dec 2019 |
| 700 | Ruff Oil Co. | Albany, TX 76430 | Oil Operator | Dec 2025 |