| 1 | Radius Operating, LLC | Round Rock, TX 78664 | Oil & Gas Operator | Sep 2026 |
| 2 | Rainbow Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Nov 2002 |
| 3 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 4 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2026 |
| 5 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 6 | Reichmann Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Sep 2026 |
| 7 | Republic Energy Inc. | Decatur, TX 76234 | Oil & Gas Operator | Dec 2016 |
| 8 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Sep 2026 |
| 9 | Riverbirch Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2026 |
| 10 | RLB Investments LLC | Holdenville, OK 74848-9421 | Oil Operator | Jul 2017 |
| 11 | Roberts & Hammack, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2026 |
| 12 | Roca Resource Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 13 | Routh Operating, LLC | Dallas, TX 75204 | Oil & Gas Operator | Mar 2011 |
| 14 | Ryder Scott Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2005 |