| 1 | Ram Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2012 |
| 2 | Rand - Paulson Oil Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Feb 1999 |
| 3 | Rand Energy Company | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 4 | Raptor Resources, Inc. | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 5 | Redman Operating Company | Houston, TX 77042 | Oil & Gas Operator | May 2008 |
| 6 | Reh Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Oct 2025 |
| 7 | Remco Oil & Gas Production,Inc. | Rio Grande Ci, TX 78582 | Oil & Gas Operator | Nov 2021 |
| 8 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 9 | Reserve Operating Corp. | Houston, TX 77040 | Oil & Gas Operator | Oct 2025 |
| 10 | Resource Expl & Prod, Inc. | Salado, TX 76571 | Oil & Gas Operator | Oct 2025 |
| 11 | Ress Production Co. | Farmington, NM 87499 | Oil & Gas Operator | Oct 2025 |
| 12 | Reveille Resources | Houston, TX 77084 | Oil & Gas Operator | Apr 2011 |
| 13 | Reveille Resources (Texas), Inc. | Houston, TX 77084 | Oil & Gas Operator | Jan 2013 |
| 14 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 15 | Ricochet Energy, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Oct 2025 |
| 16 | Riddle Engineering Corp. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2011 |
| 17 | Ridge Petroleum Inc. | Tyler, TX 75701 | Oil & Gas Operator | Oct 2025 |
| 18 | Rincon Petroleum Corporation | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Oct 2025 |
| 19 | Rlu Oil & Gas, Inc. | Devine, TX 78016 | Oil & Gas Operator | Oct 2025 |
| 20 | Rlu Operating, LLC | Devine, TX 78016 | Oil & Gas Operator | Oct 2025 |
| 21 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 22 | RNS Oil Co. | Rio Grande Ci, TX 78582 | Oil Operator | Oct 2025 |
| 23 | Roc Operating, Inc. | Plano, TX 75093 | Oil & Gas Operator | Oct 2008 |
| 24 | Rock Energy Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 25 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Oct 2025 |
| 26 | Ross Gas And Oil, LTD. Co. | Dripping SPGS, TX 78620 | Oil & Gas Operator | Oct 2025 |
| 27 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 28 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 29 | Rse, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2000 |
| 30 | Rudman Partnership, The | Dallas, TX 75201 | Oil & Gas Operator | Dec 2014 |