| 201 | Questar Energy Trading | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2020 |
| 202 | Questar Explor & Prod Co | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2017 |
| 203 | R & D Oil & Gas | Exeter, CA 93221-9697 | Oil & Gas Operator | Aug 2019 |
| 204 | Rako Operating Company | Fayetteville, AR 72701 | Oil & Gas Operator | Jan 2025 |
| 205 | Ranger Drilling LLC | Chicago, IL 60605-1041 | Oil & Gas Operator | Feb 2004 |
| 206 | Ray'S Oil Company | Boynton, OK 74422 | Oil & Gas Operator | Jan 2025 |
| 207 | Red Dirt Environmental Services LLC | Checotah, OK 74426 | Oil & Gas Operator | Jan 2025 |
| 208 | Red Fork Production, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Jan 2025 |
| 209 | Red River Services LLC | Tulsa, OK 74136 | Gas Operator | Jan 2007 |
| 210 | Redbud E & P, Inc. | Spring, TX 77379 | Oil & Gas Operator | Apr 2025 |
| 211 | Regal Petroleum Services, Inc. | Euless, TX 76039-1127 | Oil & Gas Operator | May 2015 |
| 212 | Revilo Exploration, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jul 2021 |
| 213 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2025 |
| 214 | Rio VIsta Operating LLC | Eufaula, OK 74432-0789 | Gas Operator | Jan 2025 |
| 215 | Roberson Oil Company | Houston, TX 77046 | Oil & Gas Operator | Feb 2025 |
| 216 | Robson Petroleum Company | Tulsa, OK 74104 | Oil & Gas Operator | Jan 1995 |
| 217 | Robson Resources Inc | Tulsa, OK 74104 | Oil & Gas Operator | May 1998 |
| 218 | Rose Rock Resources Inc | Wagoner, OK 74467-8362 | Oil & Gas Operator | Jan 2025 |
| 219 | Royalty Petroleum Company | Oklahoma City, OK 73120 | Gas Operator | Feb 2002 |
| 220 | Roye Realty & Developing Inc | Stigler, OK 74462-0148 | Gas Operator | Dec 2004 |
| 221 | S & S Oil Company | Electra, TX 76360 | Oil & Gas Operator | Apr 2025 |
| 222 | Salt Creek Energy Company LLC | Shawnee, OK 74802-1505 | Oil & Gas Operator | Jan 2025 |
| 223 | Samis Oil Company, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2000 |
| 224 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 225 | Sand Point LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | Dec 2020 |
| 226 | Sand Point Production Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Jan 2025 |
| 227 | Schmid Properties Inc | Hico, TX 76457 | Oil & Gas Operator | Apr 2025 |
| 228 | Scissortail Energy LLC | Tulsa, OK 74137-3644 | Oil & Gas Operator | Feb 2015 |
| 229 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 230 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 231 | Sharber Billy Jack Operating | Konawa, OK 74849-0071 | Oil & Gas Operator | Mar 2015 |
| 232 | Shaw Thomas P | Tulsa, OK 74105-7327 | Oil & Gas Operator | Mar 2015 |
| 233 | Shields Operating Inc | Fort Smith, AR 72901-3834 | Oil & Gas Operator | Oct 2021 |
| 234 | Shields Well Service Corp | Stroud, OK 74079-3410 | Oil & Gas Operator | Dec 2017 |
| 235 | Silverridge Corp | Van Buren, AR 72956 | Oil & Gas Operator | Mar 2015 |
| 236 | Six "E" Trading Company | Henryetta, OK 74801 | Oil & Gas Operator | Sep 2020 |
| 237 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 238 | SSB Production LC | Ardmore, OK 73401 | Oil & Gas Operator | Jan 2025 |
| 239 | Stewart Oil & Gas Investments Inc | Porum, OK 74455 | Gas Operator | Feb 2025 |
| 240 | Stokes Donna L | Blanchard, OK 73010 | Oil & Gas Operator | Jun 2023 |
| 241 | Stream Energy, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2024 |
| 242 | Stricker Resources Inc | Morris, OK 74445 | Oil & Gas Operator | Jan 2025 |
| 243 | Sunoco Partners MKT & Terminal | Tulsa, OK 74102-2039 | Oil & Gas Operator | Jan 2019 |
| 244 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 245 | Tag Team Resources LLC | Eufaula, OK 74432 | Oil & Gas Operator | Jan 2025 |
| 246 | Tallgrass Petroleum Corp | Hominy, OK 74035 | Oil & Gas Operator | Feb 2012 |
| 247 | Tarwater Oil & Gas LLC | San Jose, CA 95128-4219 | Oil & Gas Operator | Dec 2023 |
| 248 | Tau Ventures | Tulsa, OK 74105-1026 | Oil & Gas Operator | Jan 2025 |
| 249 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2024 |
| 250 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Feb 2025 |
| 251 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 252 | The Quintin Little Company Inc | Ardmore, OK 73401 | Oil & Gas Operator | Feb 2025 |
| 253 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 254 | Tiger Mountain Gas & Oil | Oklahoma City, OK 73118 | Gas Operator | Sep 1999 |
| 255 | Tilford Pinson Exploration LLC | Edmond, OK 73003 | Oil & Gas Operator | Jan 2025 |
| 256 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Feb 2025 |
| 257 | Trinity Oil & Gas Producers LLC | Allen, OK 74825 | Oil & Gas Operator | Jan 2025 |
| 258 | Truevine Gas Company | Ada, OK 74821-1422 | Oil & Gas Operator | Jan 2025 |
| 259 | Twisted Oak Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 260 | Two Gems Company | McAlester, OK 74502-1996 | Oil & Gas Operator | Jan 2025 |
| 261 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 262 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 263 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2025 |
| 264 | Vega Energy Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2015 |
| 265 | VRK Oil And Gas, Inc. | Arlington, TX 76016 | Oil & Gas Operator | Mar 2014 |
| 266 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 267 | Walker David Wayne | Okemah, OK 74859-9731 | Oil & Gas Operator | Sep 2022 |
| 268 | Ward Gas Marketing Inc | Enid, OK 73702 | Oil & Gas Operator | Sep 2011 |
| 269 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Jan 2025 |
| 270 | Watkins J L | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2025 |
| 271 | Watkins Oil Company | Claremore, OK 74017 | Oil & Gas Operator | May 2018 |
| 272 | West Bay Exploration Company | Muenster, TX 76252 | Oil & Gas Operator | Jan 2025 |
| 273 | Whitley Robert L | Saint Louis, OK 74866-0004 | Oil & Gas Operator | Sep 2014 |
| 274 | Williams Doyle Dba BCF Gas | Tulsa, OK 74114-7099 | Oil & Gas Operator | Jul 2023 |
| 275 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2025 |
| 276 | WN Operating Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Jan 2025 |
| 277 | WPX Energy Mid-Continent Co | Oklahoma City, OK 73102-5010 | Oil & Gas Operator | Apr 2016 |
| 278 | Xae Corporation | Norman, OK 73072 | Oil & Gas Operator | Apr 2021 |
| 279 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Feb 2025 |
| 280 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 281 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Feb 2025 |