| 1 | R & B Energy, LLC | Shelby, MT 59474 | Oil Operator | Jul 2025 |
| 2 | R & S Energy Company | Luling, TX 78648 | Oil & Gas Operator | Dec 2010 |
| 3 | R & S Oil Production Co. | Luling, TX 78648 | Oil & Gas Operator | Oct 2025 |
| 4 | Ragars Oil & Gas Co. | Austin, TX 78716 | Oil & Gas Operator | Oct 2025 |
| 5 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Oct 2025 |
| 6 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 7 | Ranger Oil Company | Canada, 00100 | Oil & Gas Operator | Sep 2001 |
| 8 | Reach Oil And Gas Company Inc | Oklahoma City, OK 73118-1100 | Oil & Gas Operator | Jun 2025 |
| 9 | Red Shell Inc | Dale, TX 78616 | Oil & Gas Operator | Oct 2025 |
| 10 | Red Wolf Oil Company, Inc. | Brenham, TX 77833 | Oil & Gas Operator | Oct 2025 |
| 11 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Oct 2025 |
| 12 | Remora Management, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Oct 2025 |
| 13 | Remora Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 14 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Oct 2025 |
| 15 | Repsol Oil & Gas USA, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 16 | Reserve Operating Corp. | Houston, TX 77040 | Oil & Gas Operator | Oct 2025 |
| 17 | Riddle Engineering Corp. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2011 |
| 18 | Riggs, Don R. | San Antonio, TX 78270 | Oil & Gas Operator | Aug 2003 |
| 19 | Riley Exploration Opg Co, LLC | La Grange, TX 78945 | Oil & Gas Operator | Oct 2025 |
| 20 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Oct 2025 |
| 21 | Rincon Petroleum Corporation | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Oct 2025 |
| 22 | Rio Bravo Expl. & Prod. Co. | Houston, TX 77055 | Oil & Gas Operator | Apr 2020 |
| 23 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |
| 24 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Oct 2025 |
| 25 | Rocc Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Apr 2024 |
| 26 | Rocc Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Oct 2025 |
| 27 | Rocker A Operating Company | Post, TX 79356 | Oil & Gas Operator | Aug 2022 |
| 28 | Rockoil Energy Of Texas, Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Oct 2025 |
| 29 | Rocky Creek Resources, LLC | Houston, TX 77055 | Oil & Gas Operator | Mar 2025 |
| 30 | Roma Oil And Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 31 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 32 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 33 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 34 | Runion Oil, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Aug 2003 |