| 1 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2025 |
| 2 | R.C.Taylor Companies, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2019 |
| 3 | R.J. Patrick Operating Co. | | Oil & Gas Operator | Jun 2006 |
| 4 | Rains & Williams | | Oil & Gas Operator | Nov 1995 |
| 5 | Rains And Williamson Oil Co. | Wichita, KS 67277 | Oil & Gas Operator | Jun 2025 |
| 6 | Rama Operating C | | Oil & Gas Operator | Dec 1996 |
| 7 | Rama Operating Co., Inc. | Stafford, KS 67578 | Oil & Gas Operator | Jun 2025 |
| 8 | Raw Energy Corporation Of Kansas | Weatherford, TX 76086 | Gas Operator | Dec 2019 |
| 9 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Oct 2025 |
| 10 | Red Hills Resources, Inc. | Englewood, KS 67840 | Oil & Gas Operator | Jun 2025 |
| 11 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 12 | Resources Invest | | Oil & Gas Operator | Jun 1985 |
| 13 | Rice Engineering Corporation | Great Bend, KS 67530 | Oil & Gas Operator | Feb 2023 |
| 14 | Ritchie Explorat | | Oil & Gas Operator | Dec 1996 |
| 15 | Ritchie Exploration | | Oil Operator | Aug 1995 |
| 16 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Jun 2025 |
| 17 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 18 | Rock Creek Resources LLC | Englewood, CO 80112 | Oil & Gas Operator | Dec 2021 |
| 19 | Rosel Energy, Inc. | Liberal, KS 67901 | Oil & Gas Operator | Jul 2004 |