| 201 | Claremont Corporation | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2017 |
| 202 | Clark Operating Services, Inc. | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 203 | Clark Well Service | Depew, OK 74028-0296 | Oil & Gas Operator | Aug 2013 |
| 204 | Claybrook Drilling Co Inc | | Oil & Gas Operator | Sep 2014 |
| 205 | Clear Creek Royalty LLC | Tulsa, OK 74137 | Oil & Gas Operator | Jul 2023 |
| 206 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 207 | Clemishire Don | Hominy, OK 74035 | Oil & Gas Operator | Jan 2025 |
| 208 | Click Betty | Stigler, OK 74462-0081 | Oil & Gas Operator | Feb 2016 |
| 209 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 210 | CLV Oil & Gas Inc | Tulsa, OK 74169-0713 | Oil & Gas Operator | Apr 2020 |
| 211 | Cmo LLC | Cleveland, OK 74020 | Oil & Gas Operator | Jan 2025 |
| 212 | CMT Oil & Gas Company Inc | Tulsa, OK 74133-6724 | Oil & Gas Operator | Jan 2025 |
| 213 | CMT Operating LLC | Cleveland, OK 74020-0113 | Oil & Gas Operator | Mar 2015 |
| 214 | CN Operating Company | Drumright, OK 74030 | Oil & Gas Operator | Nov 1998 |
| 215 | Colorado Gas Compression Inc | Longmont, CO 80501-5868 | Oil & Gas Operator | Aug 2013 |
| 216 | Colpitt Brothers Oil | Collinsville, OK 74021 | Oil & Gas Operator | Apr 2020 |
| 217 | Colpitt C H Drilling Co LLC | Collinsville, OK 74021-7107 | Oil Operator | Jan 2025 |
| 218 | Colpitt Chas H Drilling Co | Collinsville, OK 74021-7105 | Oil & Gas Operator | Mar 2012 |
| 219 | Colt Oil LLC | Sapulpa, OK 74066-1010 | Oil Operator | Jan 2025 |
| 220 | Combs Production LLC | Depew, OK 74028-0483 | Oil & Gas Operator | Jan 2025 |
| 221 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 222 | Confederate Bay LLC | Okemah, OK 74859 | Oil & Gas Operator | Jan 2025 |
| 223 | Conn-Okla Producing Co Inc | | Oil & Gas Operator | Nov 1992 |
| 224 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 225 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 226 | Consolidated Properties | Tulsa, OK 74129 | Oil & Gas Operator | Jan 2017 |
| 227 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Apr 2025 |
| 228 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2025 |
| 229 | Contreras Al Consultants Inc | Oklahoma City, OK 73113-0762 | Oil & Gas Operator | Oct 2020 |
| 230 | Cooke County Production Company | Shawnee, OK 74801-1800 | Oil & Gas Operator | Jan 2022 |
| 231 | Cornelius Oil Company | Kellyville, OK 74039-0459 | Oil & Gas Operator | Jul 2015 |
| 232 | Cornelius Oil Inc | Kellyville, OK 74039 | Oil & Gas Operator | Jan 2025 |
| 233 | Cornelius Petroleum Inc | Kellyville, OK 74039 | Oil & Gas Operator | Jan 2025 |
| 234 | Cornelius Phillip J & Connie | Kellyville, OK 74039 | Oil & Gas Operator | Dec 2000 |
| 235 | Cornelius Tony | Sapulpa, OK 74066-5845 | Oil & Gas Operator | Dec 2024 |
| 236 | Coronado Petroleum Corporation | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Jan 2025 |
| 237 | Corwin, B. V. | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 238 | Covenant Oil Corp | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 239 | Covington Oil Company Inc | Nichols Hills, OK 73116 | Oil & Gas Operator | Feb 2025 |
| 240 | Cox Linda | Bristow, OK 74010-0808 | Oil & Gas Operator | Jan 2018 |
| 241 | Cox P D Inc | Bristow, OK 74010 | Oil & Gas Operator | May 1993 |
| 242 | Crain & Deisenroth | Tulsa, OK 74103-4433 | Oil & Gas Operator | Mar 2015 |
| 243 | Crain & Deisenroth LLC | Tulsa, OK 74104-6511 | Oil & Gas Operator | Apr 2014 |
| 244 | Crasco Oil Company | Tulsa, OK 74120 | Oil Operator | Nov 1998 |
| 245 | Cross Timbers Oil Company | Dallas, TX 75284 | Oil & Gas Operator | May 2013 |
| 246 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 247 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 248 | Cross, Don E | | Oil & Gas Operator | Jan 2013 |
| 249 | Crown Petroleum Company | Duncan, OK 73534-0938 | Oil & Gas Operator | Jan 2011 |
| 250 | Crude Marketing & Trans Inc | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2017 |
| 251 | Crude Resources | Sapulpa, OK 74066 | Oil & Gas Operator | Mar 2008 |
| 252 | Cudd Operating Corp. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 253 | Cuesta Petroleum Inc | Shawnee, OK 74801-6963 | Oil & Gas Operator | Jan 2025 |
| 254 | Culbreath Oil & Gas Co Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2025 |
| 255 | Cummings Gene | | Oil Operator | Dec 2000 |
| 256 | Cummings Oil & Cattle | Ada, OK 74820-0994 | Oil Operator | Jan 2017 |
| 257 | CW Investments | Okmulgee, OK 74447-4026 | Oil & Gas Operator | Jan 2025 |
| 258 | D & D Energy Inc | Sapulpa, OK 74066-8734 | Oil & Gas Operator | May 2013 |
| 259 | D & D Oil Company | Dayton, TX 77535 | Oil & Gas Operator | Apr 2025 |
| 260 | D & G Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 261 | D & G Operating Company, Inc. | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 262 | D & J Tank Trucks Inc | Drumright, OK 74030 | Oil Operator | Feb 2025 |
| 263 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | Jan 2025 |
| 264 | D B D Oil & Gas Company | Houston, TX 77001 | Oil & Gas Operator | Mar 2015 |
| 265 | D B Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2000 |
| 266 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 267 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2025 |
| 268 | Dana Petroleum Inc | Salt Lake City, UT 84047 | Oil & Gas Operator | Nov 1998 |
| 269 | Darnell Alma | Bristow, OK 74010 | Oil & Gas Operator | Jun 2000 |
| 270 | Data Energy Inc | Evergreen, CO 80439 | Oil & Gas Operator | Jul 2018 |
| 271 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 272 | Dawes, Tom E | | Oil Operator | Oct 2000 |
| 273 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Jan 2025 |
| 274 | Deb Oil & Gas Inc | Tulsa, OK 74136 | Oil & Gas Operator | May 2013 |
| 275 | Degge Oil Field Service | Okemah, OK 74859-0269 | Oil Operator | Nov 2014 |
| 276 | Dell Charles E | Cleveland, OK 74020-0090 | Oil & Gas Operator | Feb 2015 |
| 277 | Delong Oil & Gas Serv Inc | Cushing, OK 74023 | Oil & Gas Operator | Dec 2024 |
| 278 | Denham Danny D | Kellyville, OK 74039 | Oil & Gas Operator | Jan 2025 |
| 279 | Denham Operating Company | Tulsa, OK 74101-3627 | Oil & Gas Operator | Aug 2022 |
| 280 | Denney Don | Citrus Heights, CA 95611-2473 | Oil Operator | Aug 2023 |
| 281 | Derrick Resources Inc. | Henryetta, OK 74437-4249 | Oil & Gas Operator | Jan 2025 |
| 282 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 283 | Dexxon, Inc. | Kiefer, OK 74041 | Oil & Gas Operator | Jan 2025 |
| 284 | Diamond B Company Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2010 |
| 285 | Diamond Energy Partners LLC | Collinsville, OK 74021 | Oil & Gas Operator | Jan 2025 |
| 286 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Apr 2025 |
| 287 | Discover Resources | Norman, OK 73070 | Oil & Gas Operator | Jan 2011 |
| 288 | Discover Resources LLC | Norman, OK 73072-2310 | Oil & Gas Operator | Feb 2025 |
| 289 | DMS Investments Inc | Tulsa, OK 74132-2690 | Oil & Gas Operator | Mar 2015 |
| 290 | Dobson Oil Operators Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2004 |
| 291 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 292 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Apr 2025 |
| 293 | Double J Oil Co LLC | Bristow, OK 74010-9532 | Oil & Gas Operator | Feb 2025 |
| 294 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | Feb 2025 |
| 295 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 296 | Drumright Well Service Inc | Oilton, OK 74052 | Oil & Gas Operator | Jan 2025 |
| 297 | Dual Operating & Production Co | Tulsa, OK 74145-7831 | Oil & Gas Operator | Apr 2020 |
| 298 | Dunlap Drilling & Prod Inc | Glenpool, OK 74033-4206 | Oil & Gas Operator | Jan 2025 |
| 299 | Dunlap Oil Company | Bristow, OK 74010 | Oil & Gas Operator | Jan 2025 |
| 300 | Dunlap Well Service Inc | Haskell, OK 74436 | Oil & Gas Operator | Sep 1993 |