| 1 | R & S Oil Company | Tonkawa, OK 74653 | Oil & Gas Operator | Nov 2013 |
| 2 | Rains & Williamson Oil Co Inc | Wichita, KS 67277 | Oil & Gas Operator | Jun 2025 |
| 3 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 4 | Ramsey Nichols Operating Company LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Sep 2025 |
| 5 | Ramsey Property Management LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Oct 2025 |
| 6 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 7 | RDH Enterprises Inc | El Reno, OK 73036 | Oil & Gas Operator | May 2015 |
| 8 | Red Eagle Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2005 |
| 9 | Remora Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 10 | Research Oil Company Inc | Norman, OK 73070-8776 | Oil & Gas Operator | Aug 2019 |
| 11 | Resource Oil And Gas, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2025 |
| 12 | Richard Charles J | | Oil & Gas Operator | May 1996 |
| 13 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 14 | Riley Lee Roy | Chickasha, OK 73018-9306 | Oil & Gas Operator | May 2006 |
| 15 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 16 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Oct 2025 |
| 17 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Oct 2025 |