| 1 | Rampage Exploration, Inc. | Austin, TX 78737 | Oil & Gas Operator | Mar 2025 |
| 2 | Ranger Oil Company | Canada, 00100 | Oil & Gas Operator | Sep 2001 |
| 3 | Recoil Resources Operating, Inc. | Houston, TX 77046 | Oil & Gas Operator | Mar 2024 |
| 4 | Renaissance Petroleum Co LLC | Houston, TX 77058 | Oil & Gas Operator | Nov 2011 |
| 5 | Repsol Eagle Ford North, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jul 2023 |
| 6 | Repsol Oil & Gas USA, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Mar 2025 |
| 7 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | Mar 2025 |
| 8 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 9 | Resource Expl & Prod, Inc. | Salado, TX 76571 | Oil & Gas Operator | Mar 2025 |
| 10 | Rickaway Energy, Corp. | Pleasanton, TX 78064 | Oil & Gas Operator | Mar 2025 |
| 11 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Mar 2025 |
| 12 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |
| 13 | Rio Bravo Royalty Co. | Bandera, TX 78003 | Oil & Gas Operator | Aug 2003 |
| 14 | Rio Exploration Company | San Antonio, TX 78209 | Gas Operator | Dec 2005 |
| 15 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2025 |
| 16 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 17 | Robert T. Epperson Prod Co, LLC | Tyler, TX 75713 | Gas Operator | Dec 2017 |
| 18 | Rocc Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Mar 2025 |
| 19 | Rockwell Energy, LLC | Spring, TX 77386 | Oil & Gas Operator | Sep 2014 |
| 20 | Rodel Oil & Gas Company | Houston, TX 77218 | Oil & Gas Operator | Mar 2025 |
| 21 | Rodenberg, Laura Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 22 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Mar 2025 |
| 23 | Rollert Co., Inc., The | Luling, TX 78648 | Oil & Gas Operator | Nov 2000 |
| 24 | Roma Oil And Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 25 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 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 | Mar 2025 |