| 201 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 202 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 203 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 204 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 205 | Contango Midstream Company | | Oil & Gas Operator | Feb 2024 |
| 206 | Contango Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 207 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2024 |
| 208 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 209 | Coon Creek Transmission LLC | Barnsdall, OK 74002 | Oil & Gas Operator | May 2018 |
| 210 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Jan 2024 |
| 211 | Cordillera Energy Partners LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 212 | Cornelius Phillip J & Connie | Kellyville, OK 74039 | Oil & Gas Operator | Dec 2000 |
| 213 | Corner Energy LLC | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Mar 2015 |
| 214 | Coronado Petroleum Corporation | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Jan 2024 |
| 215 | Corwin, B. V. | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 216 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 217 | Covington Oil Company Inc | Oklahoma City, OK 73154-1470 | Oil & Gas Operator | Feb 2024 |
| 218 | Craig Elder Oil And Gas LLC | Edmond, OK 73013-9791 | Oil & Gas Operator | Jan 2024 |
| 219 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 220 | CRB Resources Inc | Newcastle, OK 73065-0594 | Oil & Gas Operator | Jan 2024 |
| 221 | Crescent Oil Energies Corp | Crescent, OK 73028 | Oil & Gas Operator | Jun 1997 |
| 222 | Crow Creek Operating Co III LLC | | Oil & Gas Operator | Apr 2015 |
| 223 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Jan 2024 |
| 224 | Crude Marketing & Trans Inc | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2017 |
| 225 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 226 | Cudd Operating Corp. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 227 | Culebra Oil & Gas LLC | Kerrville, TX 78028 | Oil & Gas Operator | Apr 2024 |
| 228 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Feb 2024 |
| 229 | D & B Operating LLC | | Oil Operator | Jan 2023 |
| 230 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 231 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 232 | D & J Oil Co | Kermit, TX 79745 | Oil & Gas Operator | Apr 2024 |
| 233 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 234 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 235 | Dab And Associates Inc | Crescent, OK 73028-0580 | Oil & Gas Operator | Nov 2014 |
| 236 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2024 |
| 237 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 238 | Darnell Bobby J | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Feb 2024 |
| 239 | Darrell'S Drilling Inc | Konawa, OK 74849-0068 | Oil Operator | Feb 2024 |
| 240 | Dash Operating LLC | | Oil & Gas Operator | Jan 2024 |
| 241 | Daube Company The | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2024 |
| 242 | Daube Exploration Company | Ardmore, OK 73402 | Oil & Gas Operator | Nov 2020 |
| 243 | David E Morgan Inc | Danville, CA 94506-2035 | Oil & Gas Operator | Jan 2024 |
| 244 | Davidson Energy Inc | Perry, OK 73077-0782 | Oil & Gas Operator | Jan 2024 |
| 245 | Davis & Davis | | Oil & Gas Operator | Dec 2021 |
| 246 | Davis William H | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 247 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Jan 2024 |
| 248 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 249 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 250 | Deminex U.S. Oil Company | | Oil & Gas Operator | Jan 1998 |
| 251 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 252 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 253 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 254 | Diamond B Company Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2010 |
| 255 | Digger Oil & Gas Inc | Prague, OK 74864-0666 | Oil & Gas Operator | Jan 2024 |
| 256 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 257 | Dixie Petroleum Inc | Cashion, OK 73016 | Oil & Gas Operator | May 2001 |
| 258 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 259 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Apr 2024 |
| 260 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 261 | Dorado E & P Partners LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 262 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 263 | DRG Energy Inc | Norman, OK 73026-3171 | Oil & Gas Operator | Nov 2023 |
| 264 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 265 | Dryes Corner LLC | Crescent, OK 73028-0502 | Oil Operator | Jul 2023 |
| 266 | Duncan Oil & Gas Inc | Norman, OK 73070-8155 | Oil & Gas Operator | Sep 2020 |
| 267 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | Feb 2024 |
| 268 | Dyno Energy LLC | Oklahoma City, OK 73154-0964 | Oil & Gas Operator | Jan 2024 |
| 269 | E & E Enterprises | Enid, OK 73703-1420 | Oil & Gas Operator | Nov 2014 |
| 270 | E & S Resources LLC | Crescent, OK 73028-0532 | Oil & Gas Operator | Feb 2024 |
| 271 | E Lyle Johnson Inc | | Oil & Gas Operator | Feb 2024 |
| 272 | Eagle Energy Production LLC | | Oil & Gas Operator | Mar 2020 |
| 273 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Jan 2024 |
| 274 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 275 | East Fitts Project LTD PTNSHP | Ada, OK 74820 | Oil & Gas Operator | Dec 2002 |
| 276 | Eastok Energy Partners LLC | | Oil & Gas Operator | Jan 2024 |
| 277 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2024 |
| 278 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 279 | Edisto Resources Corp | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 280 | Edwards Roy & Co Inc | Edmond, OK 73013-1354 | Oil & Gas Operator | Feb 2012 |
| 281 | Eec Inc | Norman, OK 73069-6344 | Oil & Gas Operator | Feb 2024 |
| 282 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Feb 2024 |
| 283 | Elint Operating Inc | Oklahoma City, OK 73106 | Oil & Gas Operator | May 1995 |
| 284 | Ells Jr Harry A | Englewood, CO 80150-1162 | Gas Operator | Feb 2017 |
| 285 | Emmaus Energy LLC | | Oil & Gas Operator | Aug 2022 |
| 286 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 287 | Entex Petroleum, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 1997 |
| 288 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 289 | Eok Operating LLC | | Oil & Gas Operator | Jan 2024 |
| 290 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 291 | Epoch Resources Of Texas Inc | Port Aransas, TX 78373-1637 | Oil & Gas Operator | Nov 2014 |
| 292 | Equal Energy Us Inc | | Oil & Gas Operator | Nov 2019 |
| 293 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 294 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 295 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jan 2024 |
| 296 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 297 | Express Oil & Gas LLC | | Oil & Gas Operator | Jan 2024 |
| 298 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |
| 299 | F & S Energy LLC | | Oil & Gas Operator | Feb 2024 |
| 300 | F C D Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 1995 |