| 801 | Renfro, William B | | Oil Operator | Dec 2013 |
| 802 | Renfroe Lyndol | Wilson, OK 73463-6631 | Oil Operator | May 2020 |
| 803 | Renick Energy, L.C. | Cimarron, KS 67835 | Gas Operator | Apr 2016 |
| 804 | Rennolds Resources LLC | West Farmington, OH 44491 | Oil & Gas Operator | Dec 2025 |
| 805 | Reno Resources Inc | Boynton, OK 74422-9762 | Oil & Gas Operator | May 2015 |
| 806 | Renold, Inc. | Westfield, NY 14787 | Gas Operator | Dec 2025 |
| 807 | Renor Exploration | Englewood, CO 80111 | Oil Operator | Feb 2001 |
| 808 | Renos Land & Minerals Company | Casper, WY 82601 | Oil & Gas Operator | Oct 2021 |
| 809 | Rensark Energy Company Inc | Oklahoma City, OK 73105-5208 | Oil & Gas Operator | Apr 2015 |
| 810 | Rensma Steven E | Titusville, PA 16354-5304 | Oil Operator | Dec 1993 |
| 811 | Rent A Home Inc | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2025 |
| 812 | Rental & Fishing Tools, Inc. | | Oil Operator | Dec 2024 |
| 813 | Renuergy LLC | Houston, TX 77024 | Oil & Gas Operator | Jan 2024 |
| 814 | Renwar, Inc. | Corpus Christ, TX 78411 | Gas Operator | Feb 1999 |
| 815 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Sep 2026 |
| 816 | Reo Resources Inc | | Oil & Gas Operator | Apr 2018 |
| 817 | Reostar Operating Incorporated | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2012 |
| 818 | Replay Energy Assets LLC | Oklahoma City, OK 73156 | Oil & Gas Operator | Jun 2026 |
| 819 | Replay Resources LLC | Ada, OK 74820-6512 | Oil Operator | Nov 2022 |
| 820 | Repsol Oil & Gas USA, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2026 |
| 821 | Republic Energy Inc. | Decatur, TX 76234 | Oil & Gas Operator | Dec 2016 |
| 822 | Republic Energy Operating, LLC | Decatur, TX 76234 | Oil & Gas Operator | Jan 2016 |
| 823 | Republic Energy Resources,Inc. | | Oil Operator | May 1991 |
| 824 | Republic Exploration, LLC | Bowling Green, KY 42104 | Oil Operator | Dec 2011 |
| 825 | Republic Gas Gathering Sys Inc | | Oil & Gas Operator | Nov 1981 |
| 826 | Republic Mineral Corporation | | Oil & Gas Operator | Sep 1987 |
| 827 | Republic Petroleum Corp. | | Oil & Gas Operator | Nov 1977 |
| 828 | Republic Prod.Co.Of Tex., Inc | | Oil & Gas Operator | Jun 1981 |
| 829 | Republic Resources Corporation | Oklahoma City, OK 73102-3081 | Oil & Gas Operator | May 2021 |
| 830 | Republic Resources, LLC. | Longview, TX 75605 | Oil & Gas Operator | Sep 2026 |
| 831 | Res-Tech Inc. | | Oil & Gas Operator | Jul 2026 |
| 832 | Resaca Operating Company | Houston, TX 77010 | Oil & Gas Operator | Sep 2013 |
| 833 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Sep 2026 |
| 834 | Research Enterprises, Inc. | | Oil Operator | Jan 1996 |
| 835 | Research Exploration, LLC | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2018 |
| 836 | Research Oil Company Inc | Norman, OK 73070-8776 | Oil & Gas Operator | Aug 2019 |
| 837 | Reserve Acquisition Group | Tulsa, OK 74153 | Oil & Gas Operator | Dec 1993 |
| 838 | Reserve Energy Exploration Company | Chagrin Falls, OH 44023 | Gas Operator | Dec 2025 |
| 839 | Reserve Exploration Co. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2007 |
| 840 | Reserve Gas Company, Inc. | Alden, NY 14004 | Gas Operator | Dec 2025 |
| 841 | Reserve Management, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Sep 2026 |
| 842 | Reserve Oil & Gas | | Oil & Gas Operator | Feb 1980 |
| 843 | Reserve Oil & Gas Company | | Oil & Gas Operator | Jul 1981 |
| 844 | Reserve Oil & Gas, Inc. | Spencer, WV 252760000 | Oil & Gas Operator | Dec 2021 |
| 845 | Reserve Oil Inc. | | Oil & Gas Operator | Jan 1980 |
| 846 | Reserve Operating Corp. | Houston, TX 77040 | Oil & Gas Operator | Sep 2026 |
| 847 | Reserve Partners L.L.C. | | Oil & Gas Operator | Feb 2001 |
| 848 | Reserve Petroleum California Inc. | | Oil & Gas Operator | Dec 2025 |
| 849 | Reserve Production, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Mar 2008 |
| 850 | Reservoir Research Corp | | Oil Operator | Dec 2009 |
| 851 | Resetarits, David W. | Elma, NY 14059 | Gas Operator | Dec 2025 |
| 852 | Residual Flow Operating, LLC | | Oil Operator | Sep 2026 |
| 853 | Resolute Natural Res. Co., LLC | Midland, TX 79706 | Oil & Gas Operator | Sep 2026 |
| 854 | Resolute Natural Resources Co., LLC | Denver, CO 80203 | Oil & Gas Operator | Feb 2017 |
| 855 | Resolute Wyoming Inc | Denver, CO 80203 | Oil & Gas Operator | May 2018 |
| 856 | Resolve Energy Corp | | Gas Operator | May 2009 |
| 857 | Resonance Exploration (North Dakota) LLC | | Oil & Gas Operator | Jun 2026 |
| 858 | Resource Acquisitions Corp. | | Oil & Gas Operator | Dec 2002 |
| 859 | Resource America Inc | Uniontown, OH 44685 | Oil & Gas Operator | Dec 2011 |
| 860 | Resource Dev Technology LLC | Morrison, CO 80465-5020 | Oil & Gas Operator | Jan 2017 |
| 861 | Resource Development Inc | Stroud, OK 74079 | Oil & Gas Operator | Feb 2007 |
| 862 | Resource Development Technology, LLC | Morrison, CO 80465 | Oil & Gas Operator | Oct 2020 |
| 863 | Resource Energy Can-Am LLC | | Oil & Gas Operator | May 2022 |
| 864 | Resource Energy Inc | Uniontown, OH 44685 | Gas Operator | Dec 2007 |
| 865 | Resource Energy Technologies, LLC | | Oil & Gas Operator | Dec 2017 |
| 866 | Resource Engineering | | Gas Operator | Nov 2024 |
| 867 | Resource Enterprises Inc | Salt Lake City, UT 84108 | Gas Operator | Dec 1990 |
| 868 | Resource Expl & Prod, Inc. | Salado, TX 76571 | Oil & Gas Operator | Sep 2026 |
| 869 | Resource Management Company | Fredericksbrg, TX 78624 | Oil & Gas Operator | Feb 2015 |
| 870 | Resource Oil And Gas, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2026 |
| 871 | Resource Operating Company | Abilene, TX 79601 | Oil & Gas Operator | Jul 1997 |
| 872 | Resource Operations Inc | Tulsa, OK 74157 | Oil & Gas Operator | May 2016 |
| 873 | Resource Production Inc | Bridgeport, CT 06604 | Oil & Gas Operator | Dec 1993 |
| 874 | Resource Reclamation LLC | Greenville, KY 42345 | Gas Operator | Dec 2024 |
| 875 | Resource Rock Services, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2018 |
| 876 | Resource Securities Corp. | | Oil & Gas Operator | Mar 2005 |
| 877 | Resource Venture | | Oil & Gas Operator | Oct 1991 |
| 878 | Resources & Investment Co. | Mandeville, LA 70448 | Oil Operator | Oct 2023 |
| 879 | Resources America, Inc | | Oil Operator | Jan 1983 |
| 880 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 881 | Resources Operating Co Inc | Rogers, AR 72756 | Oil & Gas Operator | Oct 2025 |
| 882 | Ress Production Co. | Farmington, NM 87499 | Oil & Gas Operator | Mar 2026 |
| 883 | Ressler Well Service, Inc. | Burrton, KS 67020 | Oil & Gas Operator | Apr 2026 |
| 884 | Restoration Energy LLC | Amarillo, TX 79124 | Oil & Gas Operator | Sep 2026 |
| 885 | Restore Operating LLC | Andrews, TX 79714 | Oil & Gas Operator | Sep 2026 |
| 886 | Ret Oil Inc | Del City, OK 73115 | Oil & Gas Operator | Jan 2007 |
| 887 | Retama Oil Corporation | Uvalde, TX 78801 | Oil & Gas Operator | Sep 2026 |
| 888 | Retamco Operating Inc | Red Lodge, MT 59068 | Oil & Gas Operator | Jun 2026 |
| 889 | Retriever Operating LLC | Midland, TX 79704 | Oil & Gas Operator | Sep 2026 |
| 890 | Retsal Drilling Co. | | Oil & Gas Operator | Jan 1984 |
| 891 | Retsal Production Company | | Oil & Gas Operator | Mar 1986 |
| 892 | Return Oil Corp | Oil City, PA 16301-0564 | Oil Operator | Dec 1992 |
| 893 | Reubin Collins Dba RCJ Enterprises | Hobbs, NM 882416055 | Oil & Gas Operator | May 2009 |
| 894 | Reunion Energy Company | Houston, TX 77056 | Oil & Gas Operator | May 1996 |
| 895 | Reunion Resources, Inc. | | Oil & Gas Operator | Dec 2015 |
| 896 | Reunion Titan, Inc. | | Oil & Gas Operator | Jan 2017 |
| 897 | Reusch Well Service, Inc. | Ottawa, KS 66067 | Oil Operator | Dec 2019 |
| 898 | Revard Oil And Gas Properties Inc | | Oil & Gas Operator | May 2026 |
| 899 | Revard Petroleum, L.L.C. | Tulsa, OK 74170 | Oil & Gas Operator | Sep 2026 |
| 900 | Reveille Resources | Houston, TX 77084 | Oil & Gas Operator | Apr 2011 |