| 1 | Ram Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2012 |
| 2 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Oct 2025 |
| 3 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 4 | Ranger Oil Company | Canada, 00100 | Oil & Gas Operator | Sep 2001 |
| 5 | Rasmussen, Hal J. Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 2009 |
| 6 | Reb Petroleum Company | Sugar Land, TX 77478 | Oil & Gas Operator | Oct 2025 |
| 7 | Remora Management, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Oct 2025 |
| 8 | Renaissance Petroleum Co LLC | Houston, TX 77058 | Oil & Gas Operator | Nov 2011 |
| 9 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 10 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Oct 2025 |
| 11 | Riseden Services, Inc. | Houston, TX 77256 | Oil & Gas Operator | Sep 1997 |
| 12 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 13 | Rock Energy Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 14 | Rocker A Operating Company | Post, TX 79356 | Oil & Gas Operator | Aug 2022 |
| 15 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Oct 2025 |
| 16 | Roma Oil And Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 17 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 18 | Ross Production Co. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 19 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 20 | Rusk Energy Operating LLC | Houston, TX 77040 | Oil & Gas Operator | Oct 2025 |