| 1 | R & C Oil And Gas Inc | Ada, OK 74820-3150 | Oil Operator | Jul 2016 |
| 2 | R H S Inc | Ada, OK 74821-1252 | Oil & Gas Operator | Apr 2020 |
| 3 | R J Exploration LLC | Konawa, OK 74849 | Oil & Gas Operator | Mar 2026 |
| 4 | R W Production Company Inc | Ada, OK 74821-2693 | Oil & Gas Operator | Apr 2011 |
| 5 | R.D. Oil Company | Austin, TX 78755 | Oil & Gas Operator | Jun 2026 |
| 6 | Randy And Jan Walker Oil Company LLC | Konawa, OK 74849-9333 | Oil & Gas Operator | Mar 2026 |
| 7 | Ranken Energy Corporation | Edmond, OK 73013 | Oil & Gas Operator | Feb 2026 |
| 8 | Ratts, Robert V. Inc. | Bedford, TX 76021 | Oil & Gas Operator | Aug 2003 |
| 9 | Red River Oil & Gas Company | Oklahoma City, OK 73132-5120 | Oil & Gas Operator | Mar 2015 |
| 10 | Red Rock Resources, L.L.C. | Wichita Falls, TX 76310 | Oil & Gas Operator | Feb 2026 |
| 11 | Red Sand Resources LLC | Ada, OK 74821 | Oil Operator | Mar 2026 |
| 12 | Redland Resources LLC | Oklahoma City, OK 73127 | Oil & Gas Operator | Mar 2026 |
| 13 | Regency Petroleum Inc | Jones, OK 73049-8724 | Oil & Gas Operator | Mar 1999 |
| 14 | Research Oil Company Inc | Norman, OK 73070-8776 | Oil & Gas Operator | Aug 2019 |
| 15 | River Valley Oil LLC | Konawa, OK 74849 | Oil Operator | Mar 2026 |
| 16 | Roberson David A | Ada, OK 74821-0008 | Oil & Gas Operator | Jul 2010 |
| 17 | Roberson Oil Company | Houston, TX 77046 | Oil & Gas Operator | Mar 2026 |
| 18 | Roblyn Oil Inc | Allen, OK 74825-6933 | Oil & Gas Operator | Dec 2025 |
| 19 | Rock Creek Energy Co | Ada, OK 74820-5725 | Oil Operator | Jul 2022 |
| 20 | Ronmar Engineering & Expl Inc | Ada, OK 74820-1402 | Oil Operator | Aug 2013 |
| 21 | Rose Operating Company | Tulsa, OK 74101-2391 | Oil & Gas Operator | Dec 2014 |
| 22 | Ross Curtis | Ada, OK 74820-1354 | Oil & Gas Operator | Feb 2012 |
| 23 | Roxanna Oil Company | Oklahoma City, OK 73120-2717 | Oil Operator | Aug 2016 |
| 24 | Royal Drilling Inc | Russell, KS 67665 | Oil Operator | Feb 2026 |
| 25 | Rumley Robert A & Associates | Tulsa, OK 74135-1907 | Oil Operator | Feb 2026 |