| 1 | R & L Properties Inc | Richmond, MO 64085-0228 | Oil & Gas Operator | Apr 2001 |
| 2 | R3 Resources Operating Corporation | Denver, CO 80222 | Oil & Gas Operator | Nov 2025 |
| 3 | Rafter H Operating LLC | El Reno, OK 73036 | Oil & Gas Operator | Nov 2025 |
| 4 | Ram Asset Management Co | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 5 | Rambler Oil Co | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 1999 |
| 6 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 7 | Ramsey Nichols Operating Company LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Dec 2025 |
| 8 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 9 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 10 | Range Production Company, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2025 |
| 11 | Rasmussen, Hal J. Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 2009 |
| 12 | Raven Resources LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Nov 2025 |
| 13 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 14 | Rebellion Energy LLC | Tulsa, OK 74135-6241 | Oil & Gas Operator | Jun 2022 |
| 15 | Red Eagle Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2005 |
| 16 | Red Hawk Resources Inc | Edmond, OK 73003-3207 | Oil & Gas Operator | Dec 2025 |
| 17 | Red Wolf Operating LLC | Edmond, OK 73003-2179 | Oil & Gas Operator | Dec 2025 |
| 18 | Redland Resources LLC | Oklahoma City, OK 73127 | Oil & Gas Operator | Dec 2025 |
| 19 | Redline Energy LLC | Dover, OK 73734 | Oil & Gas Operator | Dec 2025 |
| 20 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 21 | Reeder Energy Operating LLC | Dallas, TX 75206-4085 | Oil & Gas Operator | Dec 2021 |
| 22 | Reign Operating LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2025 |
| 23 | Republic Resources Corporation | Oklahoma City, OK 73102-3081 | Oil & Gas Operator | May 2021 |
| 24 | Reserve Acquisition Group | Tulsa, OK 74153 | Oil & Gas Operator | Dec 1993 |
| 25 | Resolute Wyoming Inc | Denver, CO 80203 | Oil & Gas Operator | May 2018 |
| 26 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Nov 2025 |
| 27 | Richland Energy Corporation | Tulsa, OK 74103-4441 | Oil Operator | Jul 1995 |
| 28 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 29 | Rimrock Resource Operating LLC | Tulsa, OK 74103-4462 | Oil & Gas Operator | Nov 2025 |
| 30 | Rio Blanco Operating LLC | Victoria, TX 77904 | Oil & Gas Operator | Nov 2025 |
| 31 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 32 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Dec 2025 |
| 33 | Robson & Shults Prod Corp | Mannford, OK 74044 | Oil & Gas Operator | Jun 1995 |
| 34 | Rockford Energy Partners III,LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2012 |
| 35 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 36 | Rox Exploration Inc | Norman, OK 73069-6301 | Oil & Gas Operator | Nov 2025 |
| 37 | RTC Resources, LLP | Weatherford, OK 73096 | Oil & Gas Operator | Feb 2026 |
| 38 | Rupe Oil Company Inc | Wichita, KS 67278 | Oil & Gas Operator | Sep 2025 |
| 39 | Rush-Andrus Engineering | Royse City, TX 75189-1210 | Oil & Gas Operator | Feb 2022 |
| 40 | Russell D Meloy Oil & Gas Co | Enid, OK 73703-1623 | Oil & Gas Operator | Nov 2025 |