| 201 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 202 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 203 | Contango Midstream Company | Houston, TX 77002-3023 | Oil & Gas Operator | Dec 2025 |
| 204 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 205 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Feb 2026 |
| 206 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Nov 2025 |
| 207 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 208 | Cornelius Phillip J & Connie | Kellyville, OK 74039 | Oil & Gas Operator | Dec 2000 |
| 209 | Corner Energy LLC | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Mar 2015 |
| 210 | Coronado Petroleum Corporation | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Nov 2025 |
| 211 | Corwin B V | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 212 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 213 | Covington & Covington | | Gas Operator | Nov 2000 |
| 214 | Covington Oil Company Inc | Nichols Hills, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 215 | Craig Elder Oil And Gas LLC | Edmond, OK 73013 | Oil & Gas Operator | Nov 2025 |
| 216 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 217 | CRB Resources Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2025 |
| 218 | Crow Creek Operating Co III LLC | Tulsa, OK 74137-8432 | Oil & Gas Operator | Apr 2015 |
| 219 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2025 |
| 220 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 221 | Cudd Operating Corp | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 222 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Feb 2026 |
| 223 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Dec 2025 |
| 224 | Cutbirth Jack Inc | Enid, OK 73701 | Oil & Gas Operator | Jul 1994 |
| 225 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 226 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 227 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Feb 2026 |
| 228 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 229 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 230 | Dab And Associates Inc | Crescent, OK 73028-0580 | Oil & Gas Operator | Nov 2014 |
| 231 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 232 | Darnell Bobby J | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Dec 2025 |
| 233 | Darrell'S Drilling Inc | Konawa, OK 74849 | Oil Operator | Nov 2025 |
| 234 | Dash Operating LLC | Oklahoma City, OK 73118-5031 | Oil & Gas Operator | Nov 2025 |
| 235 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Nov 2025 |
| 236 | Daube Exploration Company | Ardmore, OK 73402 | Oil & Gas Operator | Nov 2020 |
| 237 | David E Morgan Inc | Danville, CA 94506-2035 | Oil & Gas Operator | Nov 2025 |
| 238 | Davidson Energy Inc | Perry, OK 73077 | Oil & Gas Operator | Nov 2025 |
| 239 | Davis & Davis | | Oil & Gas Operator | Dec 2021 |
| 240 | Davis William H | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 241 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2025 |
| 242 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 243 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 244 | Deminex U S Oil Company | | Oil & Gas Operator | Jan 1998 |
| 245 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 246 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 247 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 248 | Diamond B Company Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2010 |
| 249 | Digger Oil & Gas Inc | Prague, OK 74864 | Oil & Gas Operator | Dec 2025 |
| 250 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 251 | Dixie Petroleum Inc | Cashion, OK 73016 | Oil & Gas Operator | May 2001 |
| 252 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 253 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Feb 2026 |
| 254 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 255 | Dorado E & P Partners LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 256 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 257 | DRG Energy Inc. | Norman, OK 73026-3171 | Oil & Gas Operator | Nov 2025 |
| 258 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 259 | Drover Corporation (The) | Edmond, OK 73034 | Oil & Gas Operator | Aug 1992 |
| 260 | Dryes Corner LLC | Oklahoma City, OK 73118 | Oil Operator | Jul 2025 |
| 261 | Duncan Oil & Gas Inc | Norman, OK 73072 | Oil & Gas Operator | Sep 2020 |
| 262 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | Dec 2025 |
| 263 | Dyno Energy LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2025 |
| 264 | E & E Enterprises | Enid, OK 73703-1420 | Oil & Gas Operator | Nov 2014 |
| 265 | E & S Resources LLC | Crescent, OK 73028 | Oil & Gas Operator | Oct 2025 |
| 266 | E Lyle Johnson Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2025 |
| 267 | Eagle Energy Production LLC | Tulsa, OK 74136-1935 | Oil & Gas Operator | Mar 2020 |
| 268 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Nov 2025 |
| 269 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 270 | East Fitts Project LTD PTNSHP | Ada, OK 74820 | Oil & Gas Operator | Dec 2002 |
| 271 | Eastok Energy Partners LLC | Edmond, OK 73013-1044 | Oil & Gas Operator | Nov 2025 |
| 272 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 273 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 274 | Edisto Resources Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 275 | Edwards Roy & Co Inc | Edmond, OK 73013-1354 | Oil & Gas Operator | Feb 2012 |
| 276 | Eec Inc | Norman, OK 73072 | Oil & Gas Operator | Dec 2025 |
| 277 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Dec 2025 |
| 278 | Elint Operating Inc | Oklahoma City, OK 73106 | Oil & Gas Operator | May 1995 |
| 279 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Nov 2025 |
| 280 | Ells Jr Harry A | Englewood, CO 80150 | Gas Operator | Feb 2017 |
| 281 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 282 | Entex Petroleum Inc | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 1997 |
| 283 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 284 | Eok Operating LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Dec 2025 |
| 285 | Eott Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 286 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 287 | Epoch Resources Of Texas Inc | Port Aransas, TX 78373-1637 | Oil & Gas Operator | Nov 2014 |
| 288 | Equal Energy Us Inc | Tulsa, OK 74103-4621 | Oil & Gas Operator | Nov 2019 |
| 289 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 290 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 291 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Nov 2025 |
| 292 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 293 | Express Oil & Gas LLC | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Dec 2025 |
| 294 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 295 | F & S Energy LLC | Crescent, OK 73028 | Oil & Gas Operator | Dec 2025 |
| 296 | F C D Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 1995 |
| 297 | F D & Jack Oil Company | Muskogee, OK 74402-1444 | Oil & Gas Operator | May 2015 |
| 298 | Farmers Energy Corporation | Tulsa, OK 74103-3525 | Oil & Gas Operator | Nov 2021 |
| 299 | Farrar Carolyn Dba C J Investments | Kingfisher, OK 73750 | Oil & Gas Operator | Sep 2024 |
| 300 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |