| 201 | Roberts & Murphy, Inc. | Shreveport, LA 71137 | Oil & Gas Operator | Apr 2016 |
| 202 | Roberts Brothers | | Oil Operator | Oct 1993 |
| 203 | Roberts Resources, Inc. | Wichita, KS 67275 | Oil & Gas Operator | Jun 2025 |
| 204 | Roberts, Randy | Sedan, KS 67361 | Oil & Gas Operator | Jun 2025 |
| 205 | Robertson, Richard | Tulsa, OK 74127 | Gas Operator | Jun 2025 |
| 206 | Robinette Oil Company LLC | Chanute, KS 66720 | Oil Operator | Jun 2025 |
| 207 | Robinowitz Oil C | | Oil Operator | Dec 1996 |
| 208 | Robinowitz Oil Company, A General Partnership | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2023 |
| 209 | Robinson Energy & Exploration, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Aug 2008 |
| 210 | Robinson Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 211 | Robinson Oil Com | | Oil & Gas Operator | Feb 1995 |
| 212 | Robinson, Beryl A. | Peru, KS 67360 | Oil & Gas Operator | Mar 2012 |
| 213 | Robison, L. E. Oil | Yates Center, KS 66783 | Oil Operator | Sep 2001 |
| 214 | Robl-Six, Inc. | Ellinwood, KS 67526 | Oil Operator | Dec 2019 |
| 215 | Robuck Petroleum, LLC | Nacogdoches, TX 75965 | Oil & Gas Operator | Dec 2025 |
| 216 | Rock Creek Crude, LLC | Morrill, KS 66515 | Oil Operator | Jun 2025 |
| 217 | Rock Creek Resources LLC | Englewood, CO 80112 | Oil & Gas Operator | Dec 2021 |
| 218 | Rock Oil Company | Broken Arrow, OK 74014-6106 | Oil & Gas Operator | Aug 2025 |
| 219 | Rock Oil Corporation | Lawrence, KS 66046 | Oil Operator | Oct 2004 |
| 220 | Rock Petroleum, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2024 |
| 221 | Rockhound Petroleum, LLC | St. John, KS 67576 | Oil & Gas Operator | Jun 2025 |
| 222 | Rockin 'A' Oil | | Oil Operator | May 2025 |
| 223 | Rockin 9 Oil And Gas, LLC | Auburndale, FL 33823 | Gas Operator | Jun 2025 |
| 224 | Rockin Bar Nothin Ranch, Inc. | Independence, KS 67301 | Oil Operator | Jun 2025 |
| 225 | Rockin G. Energy, LLC | Weatherford, TX 76087 | Gas Operator | Sep 2020 |
| 226 | Rockin K Enterprises LLC | Riverside, MO 64168 | Oil Operator | May 2025 |
| 227 | Rockwall Energy LLC | Colony, KS 66015 | Oil Operator | May 2025 |
| 228 | Rockwood Petrole | | Oil Operator | Aug 1985 |
| 229 | Rocky Road Oil Company | | Oil Operator | May 2024 |
| 230 | Rodeo Resources | | Oil Operator | Jul 1986 |
| 231 | Rodgers, Murray | Sedan, KS 67361 | Oil Operator | Oct 1996 |
| 232 | Rodriguez, Everado | Paola, KS 66071 | Oil Operator | Mar 2021 |
| 233 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 234 | Rogers Merlin D | | Oil Operator | Feb 2001 |
| 235 | Rogers Oil Co. | Bronson, KS 66716 | Oil & Gas Operator | Sep 1995 |
| 236 | Rogers Oil Compa | | Oil Operator | Apr 1993 |
| 237 | Rolfe & Rolfe Oi | | Oil Operator | May 1988 |
| 238 | Rolling Meadows Oil & Gas Development, LLC | Centerville, KS 66014 | Oil Operator | Jun 2025 |
| 239 | Rome Oil, LLC | Lakewood, CO 80232 | Oil Operator | Jun 2025 |
| 240 | Ron Brooks Corp | | Oil Operator | Sep 1995 |
| 241 | Ron'S Oil Oper I | | Oil Operator | Nov 1994 |
| 242 | Ron'S Oil Operations Inc | Penokee, KS 67659 | Oil Operator | Dec 2018 |
| 243 | Ron-Bob Oil LLC | Neosho Falls, KS 66758 | Oil Operator | Jun 2025 |
| 244 | Ronald Russ Prater, Inc. | Eastborough, KS 67207 | Gas Operator | Nov 2024 |
| 245 | Ronco Incorporat | | Oil Operator | Sep 1988 |
| 246 | Rookstool, William A. | Edmond, OK 73034 | Gas Operator | Jan 1999 |
| 247 | Rosel Energy, Inc. | Liberal, KS 67901 | Oil & Gas Operator | Jul 2004 |
| 248 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 249 | Rowden, John A. | Chanute, KS 66720 | Oil Operator | Oct 1998 |
| 250 | Roxana Corporati | | Oil & Gas Operator | Feb 1993 |
| 251 | Roxanna Pipeline, Inc. | Dallas, TX 75206 | Oil & Gas Operator | May 2010 |
| 252 | Roy Farr Heirs | | Oil Operator | Jun 2013 |
| 253 | Royal Drilling Inc | Russell, KS 67665 | Oil Operator | Jun 2025 |
| 254 | Royal Energy, Inc. | Dodge City, KS 67801 | Oil Operator | Dec 2019 |
| 255 | Royal Petroleum | Baytown, TX 77521 | Oil & Gas Operator | Aug 2003 |
| 256 | RSD Minerals LLC | Wichita, KS 67206 | Oil Operator | Jun 2025 |
| 257 | Ruda Exploration Inc | Atwood, KS 67730 | Oil Operator | Jun 2025 |
| 258 | Rude Crude | | Oil Operator | Jun 2025 |
| 259 | Running Foxes Petroleum Inc. | Centennial, CO 80112 | Oil & Gas Operator | Jun 2025 |
| 260 | Rupe Oil Company Inc | Wichita, KS 67278 | Oil & Gas Operator | Jun 2025 |
| 261 | Rush Oil & Gas C | | Oil Operator | Dec 1995 |
| 262 | Rush, Terry L. | Wakeeney, KS 67672 | Oil Operator | Jun 2025 |
| 263 | Rushmore & Tresn | | Oil Operator | Jan 1995 |
| 264 | Russco Energy In | | Oil Operator | Jun 1994 |
| 265 | Russco Energy, Inc. | Gladstone, MO 64118 | Oil Operator | Apr 2002 |
| 266 | Russell Gas Co., LLC | Hugoton, KS 67451 | Gas Operator | Jun 2025 |
| 267 | Russell James E | | Oil Operator | Apr 1994 |
| 268 | Russell Oil, Inc. | Edmond, OK 73083 | Oil Operator | Jun 2025 |
| 269 | Russell, Gerald W. | Tulsa, OK 74103 | Oil Operator | Feb 1986 |
| 270 | Ryan, Daniel J. | Oklahoma City, OK 73139 | Oil Operator | Sep 2003 |
| 271 | Ryholland Fielder, Inc | Delray Beach, FL 33446 | Oil & Gas Operator | Dec 2025 |