| 1 | R & B Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 2 | R & B Oil & Gas, Inc. | Attica, KS 67009 | Oil & Gas Operator | Jun 2025 |
| 3 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2025 |
| 4 | R.C.Taylor Companies, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2019 |
| 5 | Rains & Williams | | Oil & Gas Operator | Nov 1995 |
| 6 | Rains And Williamson Oil Co. | Wichita, KS 67277 | Oil & Gas Operator | Jun 2025 |
| 7 | Raker Resources LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 8 | Rama Operating Co., Inc. | Stafford, KS 67578 | Oil & Gas Operator | Jun 2025 |
| 9 | Ramco Energy Corporation | FT. Lauderdale, FL 33312 | Oil & Gas Operator | Dec 2008 |
| 10 | Ramshorn Resources, LLC | Wichita, KS 67202 | Oil & Gas Operator | Jun 2025 |
| 11 | Range Oil Co., Inc. | Wichita, KS 67278 | Oil & Gas Operator | Jan 2020 |
| 12 | Rankin, Lennes | Sharon, KS 67138 | Gas Operator | Jun 2025 |
| 13 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Oct 2025 |
| 14 | Raymond Oil Co., Inc. | Wichita, KS 67201 | Oil & Gas Operator | Jun 2025 |
| 15 | Raymond Oil Comp | | Oil & Gas Operator | Dec 1996 |
| 16 | Reach Petroleum | | Oil & Gas Operator | Jan 1994 |
| 17 | Reach Petroleum Corporation | Wichita, KS 67218 | Oil & Gas Operator | Dec 2009 |
| 18 | Red Cedar Oil, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Feb 2025 |
| 19 | Red Hills Energy, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Jun 2025 |
| 20 | Redland Resources, LLC | Oklahoma City, OK 73127 | Oil & Gas Operator | Jul 2025 |
| 21 | Reed Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Jun 2005 |
| 22 | Resource Operations, Inc. | Tulsa, OK 74157 | Oil & Gas Operator | May 2016 |
| 23 | Resource Venture | | Oil & Gas Operator | Oct 1991 |
| 24 | Resources & Investment Co. | Mandeville, LA 70448 | Oil Operator | Oct 2023 |
| 25 | Resources Invest | | Oil & Gas Operator | Jun 1985 |
| 26 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 27 | Rice Engineering Corporation | Great Bend, KS 67530 | Oil & Gas Operator | Feb 2023 |
| 28 | Rider, Don C. | Medicine Lodge, KS 67104 | Gas Operator | Mar 2000 |
| 29 | Rine Exploration | | Oil & Gas Operator | Jul 1994 |
| 30 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 31 | Roberts Resources, Inc. | Wichita, KS 67275 | Oil & Gas Operator | Jun 2025 |
| 32 | Robinson Oil Com | | Oil & Gas Operator | Feb 1995 |
| 33 | Rupe Oil Company, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Jun 2025 |