| 1 | R3 Operating Corporation | Denver, CO 80222 | Oil & Gas Operator | Dec 2025 |
| 2 | Radtke, D.E. & Associates, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2004 |
| 3 | Ram Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2012 |
| 4 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 5 | Rand Oil & Gas Corp. | Houston, TX 77040 | Oil & Gas Operator | Dec 2025 |
| 6 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 7 | Raw Oil & Gas, Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Dec 2025 |
| 8 | Ray Herring Estate | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 9 | Ray Herring Operating Co., LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 10 | Red Tail Exploration, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 11 | Redmon Oil Company, Inc., The | Plano, TX 75023 | Oil & Gas Operator | Dec 2025 |
| 12 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Dec 2025 |
| 13 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 14 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 15 | RMB Operating LLC | Lubbock, TX 79493 | Oil & Gas Operator | Dec 2025 |
| 16 | Roberts & Roberts Enterprise,Inc | Levelland, TX 79336 | Oil & Gas Operator | Jun 1996 |
| 17 | Roc Operating, Inc. | Plano, TX 75093 | Oil & Gas Operator | Oct 2008 |
| 18 | Roca Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 19 | Roca Resource Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 20 | Rocker A Operating Company | Post, TX 79356 | Oil & Gas Operator | Aug 2022 |
| 21 | Rogers, S. K. Oil, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Dec 2025 |
| 22 | Rollo Resources, LLC | Granbury, TX 76049 | Gas Operator | Dec 2025 |