| 101 | Reef Exploration Corporation | Richardson, TX 75080 | Oil Operator | Sep 2019 |
| 102 | Reef Operating, Inc. | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 103 | Reese Exploratio | | Oil & Gas Operator | Mar 1995 |
| 104 | Reese Oil Company | Raytown, MO 64133 | Oil Operator | Jan 1999 |
| 105 | Regency Field Services LLC | Dallas, TX 75201 | Oil Operator | Jul 2017 |
| 106 | Regency Midcon Gas LLC | Dallas, TX 75201 | Oil Operator | Oct 2014 |
| 107 | Reh Oil And Gas, LLC. | Pratt, KS 67124 | Oil & Gas Operator | Apr 2019 |
| 108 | Reichlinger Business Services | | Oil Operator | Apr 2014 |
| 109 | Reif Oil & Gas Company LLC | Hoisington, KS 67544 | Oil Operator | Aug 2010 |
| 110 | Reif Oil Operati | | Oil Operator | Nov 1988 |
| 111 | Reilly Oil Company, Inc. | Wakeeney, KS 67672 | Oil Operator | Dec 2025 |
| 112 | Reilly Oil E & P | | Oil Operator | Dec 2025 |
| 113 | Relative Energy, Inc. | Lindsborg, KS 67456 | Oil Operator | Dec 2025 |
| 114 | Reliance Oil, LLC | Gridley, KS 66852 | Oil Operator | Nov 2025 |
| 115 | Remco Ener Corpo | | Oil & Gas Operator | Dec 1994 |
| 116 | Remco Energy Corporation | Independence, MO 64055 | Oil & Gas Operator | Nov 2009 |
| 117 | Remington Financ | | Oil Operator | Oct 1994 |
| 118 | Renegade Resources Corp. | Reno, NV 89511 | Oil & Gas Operator | Jul 2024 |
| 119 | Renick Energy, L.C. | Cimarron, KS 67835 | Gas Operator | Apr 2016 |
| 120 | Resource Oil And Gas, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2026 |
| 121 | Resource Operations Inc | Tulsa, OK 74157 | Oil & Gas Operator | May 2016 |
| 122 | Resource Venture | | Oil & Gas Operator | Oct 1991 |
| 123 | Resources & Investment Co. | Mandeville, LA 70448 | Oil Operator | Oct 2023 |
| 124 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 125 | Ressler Well Service, Inc. | Burrton, KS 67020 | Oil & Gas Operator | Dec 2025 |
| 126 | Reusch Well Service, Inc. | Ottawa, KS 66067 | Oil Operator | Dec 2019 |
| 127 | Rexoco Incorpora | | Oil Operator | Apr 1992 |
| 128 | Reynolds Oil Company | | Oil Operator | Nov 2005 |
| 129 | RFB Exploration | | Oil Operator | Feb 1981 |
| 130 | RGN Company, Inc. | Stockton, KS 67669 | Oil Operator | Aug 2025 |
| 131 | RH Capital-Beets, LLC | Jefferson City, MO 65101 | Oil Operator | Dec 2025 |
| 132 | Rhea, Andrew | Galva, KS 67443 | Oil & Gas Operator | Aug 2025 |
| 133 | Rheem Resources Inc | Wichita, KS 67220 | Oil Operator | Aug 1998 |
| 134 | Rhoads, Mark | Seminole, OK 74868 | Oil Operator | Sep 1999 |
| 135 | Rhodes Well Service | | Oil Operator | Dec 2025 |
| 136 | Rice Engineering | | Oil & Gas Operator | Jul 1988 |
| 137 | Rice Engineering Corporation | Great Bend, KS 67530 | Oil & Gas Operator | Feb 2023 |
| 138 | Rice Oil Co | Hobbs, NM 88240 | Oil & Gas Operator | Dec 2020 |
| 139 | Rice Production Company | | Oil Operator | Dec 2019 |
| 140 | Richard Engineer | | Oil Operator | Mar 1991 |
| 141 | Richard Oil Comp | | Oil Operator | Mar 1992 |
| 142 | Richardson And Son , Inc. | Winfield, KS 67156 | Oil Operator | Dec 2025 |
| 143 | Richardson Developments | | Oil Operator | Oct 2025 |
| 144 | Richardson J Mar | | Oil & Gas Operator | Apr 1995 |
| 145 | Richardson Oil | | Oil & Gas Operator | Dec 2019 |
| 146 | Richardson Oil Operating | | Oil & Gas Operator | Dec 2009 |
| 147 | Richey Heartsill | | Oil Operator | Feb 1991 |
| 148 | Richlan Drilling | | Oil Operator | Dec 1994 |
| 149 | Richlan Drilling, A General Partnership | Beaver, KS 67525 | Oil & Gas Operator | Dec 2025 |
| 150 | Richland Oil Investments, LLC | Palco, KS 67657 | Oil Operator | Dec 2025 |
| 151 | Rick'S Well Service | Cherryvale, KS 67335 | Oil & Gas Operator | Apr 2023 |
| 152 | Rickerson, Russell | Rantoul, KS 66079 | Oil Operator | Nov 2025 |
| 153 | Rider Oil & Gas | | Oil Operator | Aug 1991 |
| 154 | Rider, Don C. | Medicine Lodge, KS 67104 | Gas Operator | Mar 2000 |
| 155 | Rierson Energy, LLC | McPherson, KS 67460 | Oil & Gas Operator | Dec 2025 |
| 156 | Rierson, Joe | McPherson, KS 67460 | Oil Operator | Nov 2025 |
| 157 | Rig 6 Drilling Co., Inc. | Bronson, KS 66716 | Oil Operator | Oct 2019 |
| 158 | Riley Resources, Inc . | Oklahoma City, OK 73162 | Gas Operator | Dec 2025 |
| 159 | Rim Oil Company | Hays, KS 67601 | Oil Operator | Jun 2001 |
| 160 | Rimco Oil & Gas | | Oil Operator | Mar 1987 |
| 161 | Rincon Oil & Gas LLC | Arvada, CO 80005 | Gas Operator | Jun 2022 |
| 162 | Rine Drilling Co | | Oil & Gas Operator | Mar 1994 |
| 163 | Rine Drillingand Exploration, Inc. | Wichita, KS 67202 | Gas Operator | Dec 2009 |
| 164 | Rine Exploration | | Oil & Gas Operator | Jul 1994 |
| 165 | Rine Exploration Co. | | Oil Operator | Jul 1988 |
| 166 | Ring Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 167 | Ringneck Resources, LLC | Tulsa, OK 74135 | Gas Operator | Sep 2025 |
| 168 | Rissman Lease Operating | Oklahoma City, OK 73116 | Oil Operator | Dec 1996 |
| 169 | Ritchie C Stewar | | Oil Operator | Aug 1982 |
| 170 | Ritchie Explorat | | Oil & Gas Operator | Dec 1996 |
| 171 | Ritchie Exploration | | Oil Operator | Aug 1995 |
| 172 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Dec 2025 |
| 173 | Ritchie, A. Scott | Wichita, KS 67202 | Oil Operator | Mar 1988 |
| 174 | River Road Production, LLC | Hays, KS 67601 | Oil Operator | Feb 1997 |
| 175 | River Rock Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 176 | Riveria Drilling | | Oil Operator | Aug 1984 |
| 177 | Riverside Petrol | | Oil Operator | Sep 1995 |
| 178 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 179 | RJ Energy, LLC | Garnett, KS 66032 | Oil Operator | Dec 2025 |
| 180 | RJ VIsion Operating | | Oil Operator | Dec 2025 |
| 181 | RJM Company | Claflin, KS 67525 | Oil & Gas Operator | Dec 2025 |
| 182 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | Feb 2026 |
| 183 | RL Investment, LLC | Hill City, KS 67642 | Oil Operator | Dec 2025 |
| 184 | RLT Investment | Morland, KS 67650 | Oil Operator | Mar 2009 |
| 185 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 186 | RMR Drilling Com | | Oil Operator | Sep 1988 |
| 187 | Roadrunner Energy | | Oil Operator | Sep 2005 |
| 188 | Roadrunner Energy Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2015 |
| 189 | Roark S L | | Oil & Gas Operator | Nov 1992 |
| 190 | Roark, Nancy | Winfield, KS 67156 | Oil Operator | Dec 2004 |
| 191 | Robert Hopkins Operations, LLC | Salina, KS 67401 | Oil Operator | Nov 2019 |
| 192 | Robert P. Wilson, Inc. | Montclair, NJ 07043 | Gas Operator | Dec 2019 |
| 193 | Robert S. Harwell, Inc. | Edmond, OK 73034 | Oil Operator | Nov 2019 |
| 194 | Robert-Gay Energ | | Oil & Gas Operator | Jun 1992 |
| 195 | Robert-Gay Energy Enterprises | Hutchinson, KS 67501 | Oil Operator | Nov 1999 |
| 196 | Roberta Hutton/Robert Hutton | Iola, KS 66749 | Oil Operator | Oct 2007 |
| 197 | Roberts & Murphy | | Oil & Gas Operator | Sep 1995 |
| 198 | Roberts & Murphy, Inc. | Shreveport, LA 71137 | Oil & Gas Operator | Apr 2016 |
| 199 | Roberts Brothers | | Oil Operator | Oct 1993 |
| 200 | Roberts Resources, Inc. | Wichita, KS 67275 | Oil & Gas Operator | Dec 2025 |