| 201 | Republic Resources Corporation | Oklahoma City, OK 73102-3081 | Oil & Gas Operator | May 2021 |
| 202 | Research Oil Company Inc | Norman, OK 73070-8776 | Oil & Gas Operator | Aug 2019 |
| 203 | Reserve Acquisition Group | Tulsa, OK 74153 | Oil & Gas Operator | Dec 1993 |
| 204 | Reserve Exploration Co. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2007 |
| 205 | Reserve Management, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Jul 2025 |
| 206 | Resolute Wyoming Inc | Denver, CO 80203 | Oil & Gas Operator | May 2018 |
| 207 | Resource Dev Technology LLC | Morrison, CO 80465-5020 | Oil & Gas Operator | Jan 2017 |
| 208 | Resource Development, Inc. | Stroud, OK 74079 | Oil & Gas Operator | Feb 2007 |
| 209 | Resource Oil And Gas, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jul 2025 |
| 210 | Resource Operations, Inc. | Tulsa, OK 74157 | Oil & Gas Operator | May 2016 |
| 211 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 212 | Resources Operating Co Inc | Rogers, AR 72756 | Oil & Gas Operator | Apr 2025 |
| 213 | Ret Oil Inc | Del City, OK 73115 | Oil & Gas Operator | Jan 2007 |
| 214 | Revard Oil And Gas Properties Inc | | Oil & Gas Operator | Apr 2025 |
| 215 | Revelation Gas & Oil Oklahoma LLC | Kansas City, KS 66103 | Oil & Gas Operator | Jul 2023 |
| 216 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Apr 2025 |
| 217 | Revere Corporation | Fort Smith, AR 72902-0908 | Oil & Gas Operator | Feb 2015 |
| 218 | Review Oil & Gas Inc | Edmond, OK 73034-7648 | Oil & Gas Operator | Apr 2025 |
| 219 | Revilo Exploration LLC | Edmond, OK 73034 | Oil & Gas Operator | Apr 2020 |
| 220 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 221 | Revocable Inter VIvos Trust Of Delapp Frankie L | Bartlesville, OK 74006-0307 | Oil & Gas Operator | Feb 2020 |
| 222 | Revolution Operating Company,LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2024 |
| 223 | Revolution Resources LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2023 |
| 224 | Reynolds J W & Associates | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2000 |
| 225 | RF Operating And Supply Inc | | Oil & Gas Operator | Feb 2013 |
| 226 | Rhino Operating Company LLC | Brentwood, TN 37027-8760 | Oil & Gas Operator | Apr 2025 |
| 227 | Rhoades Oil Co | Tulsa, OK 74136-5575 | Oil & Gas Operator | Aug 2013 |
| 228 | Rhoads Brothers Oil & Gas Inc | Tulsa, OK 74136 | Oil & Gas Operator | May 1996 |
| 229 | Rhoads Mark Operations | Ponca City, OK 74604 | Oil & Gas Operator | May 2006 |
| 230 | Rhodes-Fielding Corporation | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |
| 231 | Ric Petroleum, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2003 |
| 232 | Rice Michael Lee | Beggs, OK 74421-2977 | Oil Operator | Jul 2024 |
| 233 | Rice Oil Co | Hobbs, NM 88240 | Oil & Gas Operator | Dec 2020 |
| 234 | Rice Patricia Dba Rice Oil | Duncan, OK 73533-1888 | Oil Operator | Jan 2021 |
| 235 | Richard C Sullins Credit Shelter Trust | Perry, OK 73077 | Gas Operator | Feb 2025 |
| 236 | Richard Charles J | | Oil & Gas Operator | May 1996 |
| 237 | Richard W Thompson Inc | Plano, TX 75075 | Oil & Gas Operator | Jul 2019 |
| 238 | Richardson Oil Company | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2003 |
| 239 | Richardson WM S | Duncan, OK 73533 | Oil Operator | Jun 2013 |
| 240 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 241 | Richart Oil Company Inc | Oklahoma City, OK 73154-0631 | Oil & Gas Operator | Aug 1995 |
| 242 | Richland Energy Corporation | Tulsa, OK 74103-4441 | Oil Operator | Jul 1995 |
| 243 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jul 2025 |
| 244 | Rick Pulliam Oil & Gas Inc | Bristow, OK 74010 | Oil & Gas Operator | Apr 2025 |
| 245 | Ricks Consulting LLC | Copan, OK 74022 | Oil Operator | Mar 2025 |
| 246 | Ricks Expl Acquisition Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2004 |
| 247 | Ricks Expl Acquisition LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2013 |
| 248 | Ricks Exploration Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 249 | Rico Oil Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 250 | Riddle William T | Haskell, OK 74436-1353 | Oil & Gas Operator | Feb 2014 |
| 251 | Ridge Petroleum Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jul 2025 |
| 252 | Rietz John T & Co Inc | | Oil & Gas Operator | Mar 1992 |
| 253 | Rif Raf Inc | Norman, OK 73069 | Oil Operator | May 1999 |
| 254 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2025 |
| 255 | Rig Petroleum, LLC | Spearman, TX 79081 | Oil & Gas Operator | Jul 2025 |
| 256 | Riggins Energy Inc. | Vernon, TX 76385 | Oil & Gas Operator | Jul 2004 |
| 257 | Riley Deborah R | Nowata, OK 74048 | Oil Operator | Apr 2025 |
| 258 | Riley Exploration Operating Co LLC | Blanchard, OK 73010-8024 | Gas Operator | Jun 2017 |
| 259 | Riley Lee Roy | Chickasha, OK 73018-9306 | Oil & Gas Operator | May 2006 |
| 260 | Rimrock Gas Company | Weatherford, OK 73096 | Oil & Gas Operator | May 2008 |
| 261 | Rimrock Resource Operating LLC | Tulsa, OK 74103-4462 | Oil & Gas Operator | Apr 2025 |
| 262 | Rio Blanco Operating LLC | Victoria, TX 77904 | Oil & Gas Operator | Apr 2025 |
| 263 | Rio Grande Drilling Company | San Antonio, TX 78212 | Oil & Gas Operator | Dec 1999 |
| 264 | Rio Petroleum, Inc. | Amarillo, TX 79102 | Oil & Gas Operator | Jul 2025 |
| 265 | Rio VIsta Operating LLC | Eufaula, OK 74432-0789 | Gas Operator | Apr 2025 |
| 266 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 267 | River City Resources Inc | Tulsa, OK 74119 | Oil & Gas Operator | Nov 1997 |
| 268 | River Rock Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 269 | River Valley Oil LLC | Konawa, OK 74849 | Oil Operator | May 2025 |
| 270 | Riverfront Exploration LLC | Fort Smith, AR 72901 | Gas Operator | Apr 2025 |
| 271 | Riverstone Energy LLC | Seminole, OK 74868 | Oil & Gas Operator | May 2025 |
| 272 | Rives Owen H | Holdenville, OK 74848-0913 | Oil & Gas Operator | Nov 2000 |
| 273 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 274 | Rixleben Jeffrey | West Chicago, IL 60186-0978 | Oil Operator | Feb 2016 |
| 275 | Rixleben Thomas B Estate | Ada, OK 74820 | Oil & Gas Operator | Mar 2014 |
| 276 | RJ Williams Oil & Gas LLC | Ardmore, OK 73401 | Oil & Gas Operator | May 2025 |
| 277 | Rja Energy LLC | Norman, OK 73069-8224 | Oil & Gas Operator | May 2025 |
| 278 | Rki Exploration & Production LLC | Tulsa, OK 74172 | Oil & Gas Operator | Jul 2025 |
| 279 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | May 2025 |
| 280 | RKR Exploration Inc | Seminole, OK 74868 | Oil & Gas Operator | Apr 2025 |
| 281 | RL&B Energy LLC | Wichita Falls, TX 76230 | Oil & Gas Operator | Apr 2025 |
| 282 | RLB Investments LLC | Holdenville, OK 74848-9421 | Oil Operator | Jul 2017 |
| 283 | RMS Monte Christo, LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Mar 2023 |
| 284 | Roadrunner Energy, Inc. | Tulsa, OK 74120 | Oil & Gas Operator | Jan 2025 |
| 285 | Roan Resources LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Apr 2024 |
| 286 | Robbins Thomas D & Charlene A Revocable Trust | Plano, TX 75093-7471 | Oil Operator | Jul 2018 |
| 287 | Roberson David A | Ada, OK 74821-0008 | Oil & Gas Operator | Jul 2010 |
| 288 | Roberson Oil Company | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 289 | Roberson, Joe | Vernon, TX 76385 | Oil & Gas Operator | Feb 2015 |
| 290 | Robert H & Layna Plummer Rev Intervivios Trust | | Oil Operator | Jul 2018 |
| 291 | Roberts & Murphy, Inc. | Shreveport, LA 71137 | Oil & Gas Operator | Apr 2016 |
| 292 | Roberts Herman | Henderson, NV 89014 | Oil Operator | Jul 2023 |
| 293 | Roberts Zetau J Fisk | Moore, OK 73160 | Oil & Gas Operator | Sep 1993 |
| 294 | Robertson Jay Estate | Tulsa, OK 74127-3029 | Oil & Gas Operator | Jul 2013 |
| 295 | Robertson Johnie J | Okmulgee, OK 74447-8765 | Oil & Gas Operator | Apr 2025 |
| 296 | Robinowitz Oil Company | Tulsa, OK 74136-1429 | Oil & Gas Operator | Feb 2023 |
| 297 | Robinson Brothers Drilling Co | | Oil & Gas Operator | Jul 2002 |
| 298 | Robinson Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 299 | Robinson Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Aug 2012 |
| 300 | Robinson Tracy D | Duncan, OK 73534 | Oil Operator | Oct 2018 |