| 1 | R & C Petroleum, Inc. | Flint, TX 75762 | Oil & Gas Operator | Nov 2025 |
| 2 | R & H Oil & Gas Inc | | Oil & Gas Operator | Apr 1992 |
| 3 | R. I. P. Operating | | Oil Operator | Oct 1986 |
| 4 | R. W. Tyson Producing Co.,Inc | | Oil & Gas Operator | Dec 2024 |
| 5 | Radiant Oil & Gas Operating Company, Inc | | Oil & Gas Operator | Aug 2015 |
| 6 | Radzewicz Expl. & DRLG. Corp. | | Oil & Gas Operator | Mar 2011 |
| 7 | Radzewicz Operating Corporation | | Oil & Gas Operator | Oct 2017 |
| 8 | Ram Petroleum, LLC | Tylertown, MS 39667 | Oil & Gas Operator | Sep 2025 |
| 9 | Rebel Drilling Company, L. P. | | Oil & Gas Operator | Sep 2004 |
| 10 | Recon Operating Inc | | Oil & Gas Operator | Jun 1991 |
| 11 | Red Sands Energy, LLC | | Oil & Gas Operator | Apr 2017 |
| 12 | Reeves Prod. Co. | | Oil & Gas Operator | Mar 1989 |
| 13 | Reformation Energy Inc | | Oil & Gas Operator | May 1984 |
| 14 | Remington Oil And Gas Corporation | | Oil & Gas Operator | Sep 2009 |
| 15 | Remora Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2025 |
| 16 | Resolve Energy Corp | | Gas Operator | May 2009 |
| 17 | Reynolds E & P, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Nov 2025 |
| 18 | Ringer Oil Co Inc | | Oil & Gas Operator | Aug 1989 |
| 19 | RLP Gulf States, L.L.C. | | Oil & Gas Operator | Apr 2012 |
| 20 | Robinson Resource Dev. Co.Inc. | | Oil & Gas Operator | Oct 1982 |
| 21 | Rock Oil, Inc. | | Oil Operator | Nov 1989 |
| 22 | Rockland Oil Company | Addison, TX 75001 | Oil & Gas Operator | Aug 2025 |
| 23 | Roppolo Petroleum Co. | | Oil & Gas Operator | Jan 2000 |
| 24 | Rosson Et Al | | Oil Operator | Aug 1983 |
| 25 | Rosson Exploration Company | | Oil & Gas Operator | Apr 2005 |
| 26 | Roundtree & Associates, Inc. | | Oil & Gas Operator | Jun 2024 |
| 27 | Rover Operating, LLC | Chicago, IL 60606 | Oil & Gas Operator | Aug 2025 |