| 1 | R. K. G. Engineering, Inc. | Odessa, TX 79760 | Oil & Gas Operator | May 2026 |
| 2 | Ranger O & G Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | May 2026 |
| 3 | Red Byrd Oil, LLC | Crystal City, TX 78839 | Oil Operator | May 2026 |
| 4 | Red Horse Petroleum | Dallas, TX 75240 | Oil & Gas Operator | May 2026 |
| 5 | Redemption Oil & Gas, LLC | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2024 |
| 6 | Reh Energy, Inc. | Corpus Christ, TX 78413 | Oil & Gas Operator | May 2026 |
| 7 | Remora Operating LLC | Houston, TX 77056 | Oil & Gas Operator | May 2026 |
| 8 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | May 2026 |
| 9 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | May 2026 |
| 10 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 11 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | May 2026 |
| 12 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | May 2026 |
| 13 | Rio Bravo Royalty Co. | Bandera, TX 78003 | Oil & Gas Operator | Aug 2003 |
| 14 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | May 2026 |
| 15 | Rocc Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | May 2026 |
| 16 | Rockford Energy Partners II, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2007 |
| 17 | Rockport Georgetown Holdings,LP | Bellaire, TX 77401 | Oil & Gas Operator | Nov 2007 |
| 18 | Rod Oil & Gas LTD. | Houston, TX 77261 | Oil & Gas Operator | Jun 1995 |
| 19 | Roma Oil And Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | May 2026 |
| 20 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | May 2026 |
| 21 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | May 2026 |
| 22 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 23 | Royal Production Company, Inc. | Corpus Christ, TX 78401 | Oil & Gas Operator | May 2026 |
| 24 | Royal Texan Resources Co. | Breckenridge, TX 76424 | Oil & Gas Operator | May 2026 |