| 1 | R & S Investments | Tulsa, OK 74146-4743 | Oil Operator | Aug 2013 |
| 2 | Radley Electric, Inc. | Sourlake, TX 77659 | Oil & Gas Operator | Oct 2001 |
| 3 | Radley, Terry R., Operator | Sourlake, TX 77659 | Oil & Gas Operator | Apr 2006 |
| 4 | Raptor Resources, Inc. | Austin, TX 78701 | Oil & Gas Operator | Feb 2026 |
| 5 | Ratts, Robert V. Inc. | Bedford, TX 76021 | Oil & Gas Operator | Aug 2003 |
| 6 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Feb 2026 |
| 7 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 8 | Remora Management, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Feb 2026 |
| 9 | Remora Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 10 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Feb 2026 |
| 11 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 12 | Reserve Management, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 13 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Nov 2025 |
| 14 | Riddle Engineering Corp. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2011 |
| 15 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Feb 2026 |
| 16 | Rincon Petroleum Corporation | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Feb 2026 |
| 17 | Rio O & P LLC | Pasadena, TX 77504 | Oil Operator | Feb 2026 |
| 18 | Rio Petroleum, Inc. | Amarillo, TX 79102 | Oil & Gas Operator | Feb 2026 |
| 19 | Riseden Services, Inc. | Houston, TX 77256 | Oil & Gas Operator | Sep 1997 |
| 20 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 21 | Rockstar Resources, LLC | Sourlake, TX 77659 | Oil & Gas Operator | Feb 2026 |
| 22 | Rockwall Marketing Corporation | Benbrook, TX 76126 | Oil & Gas Operator | Dec 2007 |
| 23 | Rodeo Resources, L.L.C. | Houston, TX 77079 | Oil & Gas Operator | Dec 2024 |
| 24 | Rox Exploration Inc | Norman, OK 73069-6301 | Oil & Gas Operator | Nov 2025 |
| 25 | Roy Jackson Energy Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 26 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 27 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 28 | Rutherford Oil Corporation | Houston, TX 77046 | Oil & Gas Operator | Jun 2019 |
| 29 | RWJ Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |