| 1 | R J Operating Company | Albany, TX 76430 | Oil & Gas Operator | Jun 2025 |
| 2 | R. P. Nixon Operations, Inc | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 3 | Ram Service - Mi | | Oil Operator | Sep 1994 |
| 4 | Rama Operating C | | Oil & Gas Operator | Dec 1996 |
| 5 | Rama Operating Co., Inc. | Stafford, KS 67578 | Oil & Gas Operator | Jun 2025 |
| 6 | Ramco Drilling S | | Oil & Gas Operator | Dec 1992 |
| 7 | Ramco Energy Corporation | FT. Lauderdale, FL 33312 | Oil & Gas Operator | Dec 2008 |
| 8 | Raney Oil Company | Lawrence, KS 66047 | Oil & Gas Operator | May 1999 |
| 9 | Range Oil Co., Inc. | Wichita, KS 67278 | Oil & Gas Operator | Jan 2020 |
| 10 | Range Oil Compan | | Oil & Gas Operator | Nov 1995 |
| 11 | Raymond Oil Co., Inc. | Wichita, KS 67201 | Oil & Gas Operator | Jun 2025 |
| 12 | Raymond Oil Comp | | Oil & Gas Operator | Dec 1996 |
| 13 | Reichlinger Business Services | | Oil Operator | Apr 2014 |
| 14 | Reif Oil & Gas Company LLC | Hoisington, KS 67544 | Oil Operator | Aug 2010 |
| 15 | Reif Oil Operati | | Oil Operator | Nov 1988 |
| 16 | Resource Operations, Inc. | Tulsa, OK 74157 | Oil & Gas Operator | May 2016 |
| 17 | Rice Engineering | | Oil & Gas Operator | Jul 1988 |
| 18 | Rice Production Company | | Oil Operator | Dec 2019 |
| 19 | Richlan Drilling | | Oil Operator | Dec 1994 |
| 20 | Richlan Drilling, A General Partnership | Beaver, KS 67525 | Oil & Gas Operator | Jun 2025 |
| 21 | Ritchie Explorat | | Oil & Gas Operator | Dec 1996 |
| 22 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Jun 2025 |
| 23 | Ritchie, A. Scott | Wichita, KS 67202 | Oil Operator | Mar 1988 |
| 24 | Riverside Petrol | | Oil Operator | Sep 1995 |
| 25 | RJM Company | Claflin, KS 67525 | Oil & Gas Operator | Jun 2025 |
| 26 | Robinowitz Oil C | | Oil Operator | Dec 1996 |
| 27 | Robinowitz Oil Company, A General Partnership | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2023 |
| 28 | Robl-Six, Inc. | Ellinwood, KS 67526 | Oil Operator | Dec 2019 |
| 29 | Rodgers, Murray | Sedan, KS 67361 | Oil Operator | Oct 1996 |
| 30 | Rosel Energy, Inc. | Liberal, KS 67901 | Oil & Gas Operator | Jul 2004 |
| 31 | Roxana Corporati | | Oil & Gas Operator | Feb 1993 |
| 32 | Royal Drilling Inc | Russell, KS 67665 | Oil Operator | Jun 2025 |
| 33 | Rupe Oil Company, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Jun 2025 |
| 34 | Russco Energy In | | Oil Operator | Jun 1994 |
| 35 | Russell Oil, Inc. | Edmond, OK 73083 | Oil Operator | Jun 2025 |
| 36 | Ryan, Daniel J. | Oklahoma City, OK 73139 | Oil Operator | Sep 2003 |