| 1 | R & B Energy, LLC | Shelby, MT 59474 | Oil Operator | Jul 2025 |
| 2 | R & M Energy | Gonzales, TX 78629 | Oil & Gas Operator | Mar 2006 |
| 3 | R & S Oil Production Co. | Luling, TX 78648 | Oil & Gas Operator | Oct 2025 |
| 4 | R&R Resources Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2015 |
| 5 | Radius Operating, LLC | Round Rock, TX 78664 | Oil & Gas Operator | Oct 2025 |
| 6 | Rampage Exploration, Inc. | Austin, TX 78737 | Oil & Gas Operator | Oct 2025 |
| 7 | Rathburn Land & Devel, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 8 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Oct 2025 |
| 9 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 10 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Oct 2025 |
| 11 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 12 | Repsol Oil & Gas USA, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 13 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Oct 2025 |
| 14 | Rio Grande Drilling Company | San Antonio, TX 78212 | Oil & Gas Operator | Dec 1999 |
| 15 | Rocanville Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 16 | Rocc Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Apr 2024 |
| 17 | Rocc Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Oct 2025 |
| 18 | Rollert Co., Inc., The | Luling, TX 78648 | Oil & Gas Operator | Nov 2000 |
| 19 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 20 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 21 | Ross Gas And Oil, LTD. Co. | Dripping SPGS, TX 78620 | Oil & Gas Operator | Oct 2025 |
| 22 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 23 | Ruth Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Feb 2010 |