| 1 | Radley, Terry R., Operator | Sourlake, TX 77659 | Oil & Gas Operator | Apr 2006 |
| 2 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 3 | Red Wolf Oil Company, Inc. | Brenham, TX 77833 | Oil & Gas Operator | Oct 2025 |
| 4 | Redman Operating Company | Houston, TX 77042 | Oil & Gas Operator | May 2008 |
| 5 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Oct 2025 |
| 6 | Reef Exploration, Inc. (A-1) | Richardson, TX 75080 | Oil & Gas Operator | Oct 2006 |
| 7 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Oct 2025 |
| 8 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | Oct 2025 |
| 9 | Rheaco Oil Company, LTD. | Sourlake, TX 77659 | Oil Operator | Oct 2025 |
| 10 | Rock Creek Oil, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Nov 2019 |
| 11 | Rockbridge Oil And Gas, Inc. | Houston, TX 77227 | Oil & Gas Operator | Nov 1997 |
| 12 | Rockland Oil Company | Addison, TX 75001 | Oil & Gas Operator | Jun 2025 |
| 13 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 14 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 15 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 16 | Rutherford Oil Corporation | Houston, TX 77046 | Oil & Gas Operator | Jun 2019 |