| 1 | R A Miller Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Mar 2020 |
| 2 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2025 |
| 3 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 4 | Ranken Energy Corporation | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 5 | Ravil Inc | Edmond, OK 73013 | Gas Operator | Nov 1998 |
| 6 | RCK Oil And Gas LLC | Denton, TX 76207 | Oil & Gas Operator | Jun 2025 |
| 7 | Red Mountain Operating LLC | Oklahoma City, OK 73118-1253 | Oil & Gas Operator | Apr 2024 |
| 8 | Red Rocks Oil & Gas Operating LLC | Oklahoma City, OK 73103-4821 | Oil & Gas Operator | Jul 2025 |
| 9 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Oct 2025 |
| 10 | Redwine Resources Inc | Dallas, TX 75225 | Oil & Gas Operator | Feb 2015 |
| 11 | Reid Williams Operating Inc | Shreveport, LA 71106-6223 | Oil & Gas Operator | Jun 2025 |
| 12 | Revere Corporation | Fort Smith, AR 72902-0908 | Oil & Gas Operator | Feb 2015 |
| 13 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 14 | Riley Exploration Operating Co LLC | Blanchard, OK 73010-8024 | Gas Operator | Jun 2017 |
| 15 | Rio VIsta Operating LLC | Eufaula, OK 74432-0789 | Gas Operator | May 2025 |
| 16 | River City Resources Inc | Tulsa, OK 74119 | Oil & Gas Operator | Nov 1997 |
| 17 | Riverfront Exploration LLC | Fort Smith, AR 72901 | Gas Operator | Jun 2025 |
| 18 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 19 | RL&B Energy LLC | Wichita Falls, TX 76230 | Oil & Gas Operator | May 2025 |
| 20 | Roberson Oil Company | Houston, TX 77046 | Oil & Gas Operator | Jun 2025 |
| 21 | Rockwell Drilling Company | New York, NY 10013 | Oil & Gas Operator | Dec 2005 |
| 22 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 23 | Rover Operating, LLC | Chicago, IL 60606 | Oil & Gas Operator | Jun 2025 |
| 24 | Royalty Petroleum Company | Oklahoma City, OK 73120 | Gas Operator | Feb 2002 |
| 25 | Rush Creek Operating LLC | McKinney, TX 75070 | Oil & Gas Operator | Oct 2025 |