| 3801 | Red Rooster Gas Corporation | | Gas Operator | Sep 1993 |
| 3802 | Red Willow Offshore, LLC | | Oil & Gas Operator | Apr 2011 |
| 3803 | Red Wing Oil & Gas, Inc. | | Oil Operator | Sep 1990 |
| 3804 | Redd Production Of Mansfield | | Oil & Gas Operator | Jan 1991 |
| 3805 | Redman Operating Company | Houston, TX 77042 | Oil & Gas Operator | May 2008 |
| 3806 | Redmon Oil Company, Inc., The | Plano, TX 75023 | Oil & Gas Operator | Sep 2026 |
| 3807 | Reeder Production | | Oil Operator | Oct 2005 |
| 3808 | Reef Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2007 |
| 3809 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Sep 2026 |
| 3810 | Reese Energy Corp. | | Oil & Gas Operator | Oct 1991 |
| 3811 | Reese Oil & Gas LTD | | Oil & Gas Operator | Sep 1991 |
| 3812 | Reese Oil And Gas Company | | Oil & Gas Operator | Mar 1985 |
| 3813 | Refined Products, Inc. | Beaumont, TX 77705 | Oil Operator | Sep 2026 |
| 3814 | Regal Petroleum Services Inc | Euless, TX 76039-1127 | Oil & Gas Operator | May 2015 |
| 3815 | Regency Field Services LLC | Dallas, TX 75201 | Oil Operator | Jul 2017 |
| 3816 | Regency Gas Gathrng & Proc LLC | | Oil Operator | Sep 2007 |
| 3817 | Regency Intrastate Gas LLC | | Oil Operator | Feb 2009 |
| 3818 | Reita Oil Company | | Oil & Gas Operator | Jan 1987 |
| 3819 | Relco Exploration Co., Inc. | | Gas Operator | Aug 1987 |
| 3820 | Reliable Prod Service Inc. | | Oil Operator | Mar 2007 |
| 3821 | Reliance Energy, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 3822 | Reliance Petroleum Corporation | | Oil & Gas Operator | Oct 2018 |
| 3823 | Reliance TR-JV | | Gas Operator | Apr 1988 |
| 3824 | Reliance Trusts | Dallas, TX 75244 | Oil & Gas Operator | Nov 1995 |
| 3825 | Reliance Trusts HS | | Gas Operator | Feb 1989 |
| 3826 | Reliance Well Service, Inc. | | Oil & Gas Operator | Apr 1997 |
| 3827 | Reliant Energy Field SVS Inc. | | Oil Operator | Sep 2002 |
| 3828 | Relmm Corporation | | Oil & Gas Operator | May 1980 |
| 3829 | Remuda Oil & Gas Corp. | | Oil & Gas Operator | Aug 1987 |
| 3830 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Sep 2026 |
| 3831 | Renaissance Offshore, LLC | | Oil & Gas Operator | Mar 2023 |
| 3832 | Renaissance Petroleum Co LLC | Houston, TX 77058 | Oil & Gas Operator | Nov 2011 |
| 3833 | Rental & Fishing Tools, Inc. | | Oil Operator | Dec 2024 |
| 3834 | Republic Energy Resources,Inc. | | Oil Operator | May 1991 |
| 3835 | Republic Gas Gathering Sys Inc | | Oil & Gas Operator | Nov 1981 |
| 3836 | Republic Mineral Corporation | | Oil & Gas Operator | Sep 1987 |
| 3837 | Republic Petroleum Corp. | | Oil & Gas Operator | Nov 1977 |
| 3838 | Republic Prod.Co.Of Tex., Inc | | Oil & Gas Operator | Jun 1981 |
| 3839 | Research Enterprises, Inc. | | Oil Operator | Jan 1996 |
| 3840 | Reserve Oil Inc. | | Oil & Gas Operator | Jan 1980 |
| 3841 | Reserve Partners L.L.C. | | Oil & Gas Operator | Feb 2001 |
| 3842 | Resource Acquisitions Corp. | | Oil & Gas Operator | Dec 2002 |
| 3843 | Resource Development Inc | Stroud, OK 74079 | Oil & Gas Operator | Feb 2007 |
| 3844 | Resource Securities Corp. | | Oil & Gas Operator | Mar 2005 |
| 3845 | Resources America, Inc | | Oil Operator | Jan 1983 |
| 3846 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 3847 | Retsal Drilling Co. | | Oil & Gas Operator | Jan 1984 |
| 3848 | Retsal Production Company | | Oil & Gas Operator | Mar 1986 |
| 3849 | Reunion Energy Company | Houston, TX 77056 | Oil & Gas Operator | May 1996 |
| 3850 | Reunion Resources, Inc. | | Oil & Gas Operator | Dec 2015 |
| 3851 | Reunion Titan, Inc. | | Oil & Gas Operator | Jan 2017 |
| 3852 | Revel Oil & Gas, Inc. | | Oil & Gas Operator | Feb 2001 |
| 3853 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 3854 | Reynolds Drill Coinc/Rosbottom | | Oil & Gas Operator | Jan 1990 |
| 3855 | Reynolds Drilling Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Sep 2026 |
| 3856 | Reynolds E & P, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Sep 2026 |
| 3857 | Reynolds Oil Company | | Oil Operator | Nov 2005 |
| 3858 | Rhoads Oil, LLC | | Oil Operator | Jan 2025 |
| 3859 | Ric Petroleum | | Gas Operator | Dec 1998 |
| 3860 | Riceland Petroleum Company | | Oil & Gas Operator | Nov 2024 |
| 3861 | Richard A. Williams Expl Corp. | | Oil & Gas Operator | Dec 1983 |
| 3862 | Richard B. Nelson,Etal | | Oil & Gas Operator | May 1979 |
| 3863 | Richard C. Hinds | | Oil Operator | Jan 2025 |
| 3864 | Richard H. Lee, L.L.C. | | Oil & Gas Operator | Sep 1999 |
| 3865 | Richard Nelson | | Oil Operator | Feb 1987 |
| 3866 | Richard T. Perry | | Gas Operator | May 1993 |
| 3867 | Richardson Energy Corporation | | Oil & Gas Operator | Dec 1987 |
| 3868 | Ricks & Ricks Oil Producers | | Oil Operator | Sep 1983 |
| 3869 | Ridgelake Energy, Inc. | | Oil & Gas Operator | Jul 2020 |
| 3870 | Ridgeway Exco, Inc. | San Antonio, TX 78279 | Oil & Gas Operator | Mar 1996 |
| 3871 | Rig Iron Petroleum Inc | | Oil & Gas Operator | Aug 1988 |
| 3872 | Rig Iron, Inc. | | Oil & Gas Operator | Mar 1991 |
| 3873 | Rigel Resources Co., Inc. | | Oil Operator | Aug 2009 |
| 3874 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Sep 2026 |
| 3875 | Rimco Production Company, Inc. | | Oil & Gas Operator | Jan 2004 |
| 3876 | Rimfire Swabbing, Inc. | | Oil Operator | Jan 2025 |
| 3877 | Rio Bravo Expl. & Prod. Co. | Houston, TX 77055 | Oil & Gas Operator | Apr 2020 |
| 3878 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |
| 3879 | Rio Grande Drilling Company | San Antonio, TX 78212 | Oil & Gas Operator | Dec 1999 |
| 3880 | Ripco | | Oil & Gas Operator | Jul 1986 |
| 3881 | Rippy Oil Company | Tyler, TX 75702 | Oil & Gas Operator | Sep 2026 |
| 3882 | Riseden Services, Inc. | Houston, TX 77256 | Oil & Gas Operator | Sep 1997 |
| 3883 | Riseden, LTD | | Oil & Gas Operator | Nov 1989 |
| 3884 | Risher Company, Inc. | | Oil & Gas Operator | Jul 2001 |
| 3885 | Rising Star 2000 Oil & Gas, Inc. | | Oil Operator | Dec 2024 |
| 3886 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 3887 | Rising Star Energy-Oper Co., LLC | | Oil & Gas Operator | Nov 2006 |
| 3888 | River Bend Operating, Inc. | | Oil & Gas Operator | Jul 1999 |
| 3889 | River City Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Nov 1997 |
| 3890 | River Energy Co., Inc. | | Gas Operator | Dec 2012 |
| 3891 | River Rouge Minerals | | Oil & Gas Operator | Dec 2024 |
| 3892 | River Rouge Minerals Inc | | Oil & Gas Operator | Mar 1981 |
| 3893 | Riverside Resources, Inc. | | Oil & Gas Operator | Oct 2015 |
| 3894 | Riverstone Energy Operating, LLC | Houston, TX 77090 | Oil & Gas Operator | Sep 2026 |
| 3895 | Riverwood Production Co., Inc. | | Oil & Gas Operator | Nov 1990 |
| 3896 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2026 |
| 3897 | RLM Energy Company Inc. | Monroe, LA 71201 | Oil & Gas Operator | Mar 2008 |
| 3898 | RLS Partnership | | Oil Operator | Apr 1983 |
| 3899 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 3900 | RMR Oil Company | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2005 |