| 3801 | Ridgeway Exco, Inc. | San Antonio, TX 78279 | Oil & Gas Operator | Mar 1996 |
| 3802 | Rig Iron Petroleum Inc | | Oil & Gas Operator | Aug 1988 |
| 3803 | Rig Iron, Inc. | | Oil & Gas Operator | Mar 1991 |
| 3804 | Rigel Resources Co., Inc. | | Oil Operator | Aug 2009 |
| 3805 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Apr 2024 |
| 3806 | Rimco Production Company, Inc. | | Oil & Gas Operator | Jan 2004 |
| 3807 | Rio Bravo Expl. & Prod. Co. | Houston, TX 77055 | Oil & Gas Operator | Apr 2020 |
| 3808 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |
| 3809 | Rio Grande Drilling Company | San Antonio, TX 78212 | Oil & Gas Operator | Dec 1999 |
| 3810 | Ripco | | Oil & Gas Operator | Jul 1986 |
| 3811 | Rippy Oil Company | Tyler, TX 75702 | Oil & Gas Operator | Apr 2024 |
| 3812 | Riseden Services, Inc. | Houston, TX 77256 | Oil & Gas Operator | Sep 1997 |
| 3813 | Riseden, LTD | | Oil & Gas Operator | Nov 1989 |
| 3814 | Risher Company, Inc. | | Oil & Gas Operator | Jul 2001 |
| 3815 | Rising Star 2000 Oil & Gas, Inc. | | Oil Operator | Dec 2023 |
| 3816 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 3817 | Rising Star Energy-Oper Co., LLC | | Oil & Gas Operator | Nov 2006 |
| 3818 | River Bend Operating, Inc. | | Oil & Gas Operator | Jul 1999 |
| 3819 | River City Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Nov 1997 |
| 3820 | River Energy Co., Inc. | | Gas Operator | Dec 2012 |
| 3821 | River Rouge Minerals | | Oil & Gas Operator | Dec 2023 |
| 3822 | River Rouge Minerals Inc | | Oil & Gas Operator | Mar 1981 |
| 3823 | Riverside Resources, Inc. | | Oil & Gas Operator | Oct 2015 |
| 3824 | Riverstone Energy Operating, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2024 |
| 3825 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2024 |
| 3826 | RLM Energy Company Inc. | Monroe, LA 71201 | Oil & Gas Operator | Mar 2008 |
| 3827 | RLP Gulf States, L.L.C. | | Oil & Gas Operator | Apr 2012 |
| 3828 | RLS Partnership | | Oil Operator | Apr 1983 |
| 3829 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 3830 | RMR Oil Company | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2005 |
| 3831 | RMT Resources LLC | | Oil Operator | Jan 2024 |
| 3832 | Robco Investments, Inc. | | Oil & Gas Operator | Jul 2016 |
| 3833 | Roberson Farm Equipment, Inc. | | Oil Operator | Mar 1989 |
| 3834 | Roberson Well Service | | Gas Operator | Dec 2023 |
| 3835 | Robert A Craig | | Oil Operator | Jul 2020 |
| 3836 | Robert C. Pettit | | Oil & Gas Operator | Feb 1986 |
| 3837 | Robert D Valerius Inc. | | Oil Operator | Mar 1996 |
| 3838 | Robert E McDowell | | Oil Operator | Dec 1998 |
| 3839 | Robert G Cox & Assoc La Inc. | | Oil & Gas Operator | Jun 1994 |
| 3840 | Robert K. Freeman | | Oil Operator | Jul 1991 |
| 3841 | Robert L. Waterbury | | Oil & Gas Operator | Nov 2001 |
| 3842 | Robert L. Waterbury, L.L.C. | | Oil & Gas Operator | Jan 2024 |
| 3843 | Robert M. Mills | | Oil Operator | Oct 2017 |
| 3844 | Robert P. Artzberger | | Oil & Gas Operator | Dec 1979 |
| 3845 | Robert S. Barnwell, III | | Oil & Gas Operator | Oct 1984 |
| 3846 | Robert W. Omeara | | Oil & Gas Operator | Sep 1988 |
| 3847 | Roberts & Bunch Resources | | Oil & Gas Operator | Dec 1993 |
| 3848 | Roberts Oil Corp. | | Oil & Gas Operator | Sep 1982 |
| 3849 | Robertson Energy, LLC | | Oil & Gas Operator | Dec 2023 |
| 3850 | Robie A. Bridges III | | Oil Operator | Aug 1993 |
| 3851 | Robinett Resources Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 1999 |
| 3852 | Roblyn Petroleum Corp. | | Oil & Gas Operator | May 1983 |
| 3853 | Rock Creek Oil, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Nov 2019 |
| 3854 | Rock Energy Operating Company | | Oil & Gas Operator | Nov 2008 |
| 3855 | Rock Energy, Inc. | | Oil & Gas Operator | Sep 1992 |
| 3856 | Rock Well Petroleum (U.S.), Inc. | Canada, 00100 | Oil & Gas Operator | Sep 2014 |
| 3857 | Rockbridge Oil & Gas | Houston, TX 77027 | Oil & Gas Operator | Mar 1990 |
| 3858 | Rockcliff Operating La LLC | | Oil & Gas Operator | Jul 2022 |
| 3859 | Rockland Oil Company | Addison, TX 75001 | Oil & Gas Operator | Jan 2024 |
| 3860 | Rockleigh K. Thurman | | Oil & Gas Operator | Jan 2024 |
| 3861 | Rocky Mount Gas Gathering,LLC | | Oil Operator | Apr 2001 |
| 3862 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Apr 2024 |
| 3863 | Roger Wilson | | Oil Operator | Apr 2002 |
| 3864 | Roger Wilson, Inc. | | Oil Operator | Jul 2019 |
| 3865 | Rogers Oil Co. | Bronson, KS 66716 | Oil & Gas Operator | Sep 1995 |
| 3866 | Rojo Oil Company | McLean, TX 79057 | Oil & Gas Operator | Apr 2024 |
| 3867 | Rollar Oil Co., Inc. | | Oil & Gas Operator | Jul 1999 |
| 3868 | Romaxsco Exploration Co., Inc. | | Oil & Gas Operator | Aug 1993 |
| 3869 | Roms Co., Inc. | | Oil Operator | Jun 1983 |
| 3870 | Ron Knott & Associates,Inc. | | Oil & Gas Operator | Aug 1989 |
| 3871 | Ronald E. Hall | | Oil Operator | Nov 1991 |
| 3872 | Ronny N. Davis | | Oil Operator | Jan 2024 |
| 3873 | Rooster Petroleum, LLC | | Oil & Gas Operator | Feb 2011 |
| 3874 | Rooster Production, LLC | Oil City, LA 71061 | Oil Operator | Apr 2024 |
| 3875 | Rosamond Drilling Co., Inc. | | Gas Operator | Nov 1984 |
| 3876 | Rosbottom Petroleum | | Oil & Gas Operator | Aug 1988 |
| 3877 | Rosbottom Production Corp | Shreveport, LA 71134 | Oil & Gas Operator | Dec 2017 |
| 3878 | Rose Pass Mines, Inc. | | Oil Operator | Oct 1982 |
| 3879 | Rosestone Operating Company, LLC | | Oil & Gas Operator | Dec 2023 |
| 3880 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2024 |
| 3881 | Rosewood Resources (HPC), Inc. | | Gas Operator | Dec 1984 |
| 3882 | Rosewood Resources (Poc), Inc. | | Oil & Gas Operator | Dec 1984 |
| 3883 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 3884 | Ross & Glenn Petroleum Inc. | | Oil & Gas Operator | Aug 1984 |
| 3885 | Ross Exploration,Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2013 |
| 3886 | Ross Prod. - Zwahlen & Raish | | Oil & Gas Operator | Sep 1998 |
| 3887 | Ross Production Co. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 3888 | Roughneck L.L.C. | | Oil Operator | Jan 2024 |
| 3889 | Rouxopco LLC | | Oil Operator | Nov 2023 |
| 3890 | Rovig Minerals, Inc. | | Oil & Gas Operator | May 2020 |
| 3891 | Rowe Oil And Gas, Inc. | | Oil & Gas Operator | May 1999 |
| 3892 | Rowe Oil Co. | | Oil Operator | Jan 2002 |
| 3893 | Rowe, Inc. | | Oil & Gas Operator | Jun 1992 |
| 3894 | Roxanna Acadia, LLC | | Oil & Gas Operator | May 2023 |
| 3895 | Roy D. Gish | | Oil & Gas Operator | Sep 2019 |
| 3896 | Roy M. Huffington, Inc. | | Oil & Gas Operator | Jul 1983 |
| 3897 | Roy M. Teel | | Oil & Gas Operator | Nov 1983 |
| 3898 | Royal Petroleum Corp. | Dallas, TX 75229 | Oil & Gas Operator | Jan 2024 |
| 3899 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 3900 | Royalty Management & Dev Corp. | | Oil & Gas Operator | Apr 1998 |