| 1 | R & S Oil Company | Tonkawa, OK 74653 | Oil & Gas Operator | Nov 2013 |
| 2 | R A M Corporation | Blackwell, OK 74631-0045 | Oil & Gas Operator | Mar 2026 |
| 3 | R C Holdings LLC | Garber, OK 73738-5423 | Oil & Gas Operator | Oct 2025 |
| 4 | Ra-Jac LLC | Norman, OK 73069 | Oil & Gas Operator | Mar 2026 |
| 5 | Rahmco Oil And Gas Co Inc | Ponca City, OK 74604-5155 | Oil & Gas Operator | Jan 2013 |
| 6 | Ram Oil & Gas | Blackwell, OK 74631 | Oil & Gas Operator | May 2013 |
| 7 | Rama Operating Company Inc | Stafford, KS 67578 | Oil & Gas Operator | Apr 2026 |
| 8 | Ramsey Nichols Operating Company LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Apr 2026 |
| 9 | Ramsey Property Management LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2026 |
| 10 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 11 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 12 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2026 |
| 13 | Red Eagle Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2005 |
| 14 | Red Fork (USA) Investments Inc | Midland, TX 79710-0272 | Oil & Gas Operator | May 2019 |
| 15 | Rence Guy A | | Oil Operator | Jan 2013 |
| 16 | Reno Resources Inc | Boynton, OK 74422-9762 | Oil & Gas Operator | May 2015 |
| 17 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 18 | Rhoads Mark Operations | Ponca City, OK 74604 | Oil & Gas Operator | May 2006 |
| 19 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2026 |
| 20 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 21 | Roadrunner Energy Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2015 |
| 22 | Rogers Well Service Inc | Ponca City, OK 74601 | Oil & Gas Operator | Apr 2014 |
| 23 | Ron & Dan'S Oil LTD | Barnsdall, OK 74002-0628 | Oil & Gas Operator | May 2011 |
| 24 | Ronco Energy Resources Inc | Norman, OK 73072 | Oil & Gas Operator | Apr 2015 |
| 25 | Rose Rock Resources Inc | Wagoner, OK 74467-8362 | Oil & Gas Operator | Mar 2026 |
| 26 | Roth Gary E | Tonkawa, OK 74653-2033 | Oil & Gas Operator | Jan 2020 |
| 27 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |