| 201 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 202 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 203 | Dexxon Inc | Kiefer, OK 74041 | Oil & Gas Operator | Oct 2025 |
| 204 | Diamondback-Disposal LLC | Oklahoma City, OK 73134-1016 | Oil Operator | Dec 2008 |
| 205 | Dickerson Oil | Ada, OK 74820 | Oil Operator | Jan 2025 |
| 206 | Dimock Petroleum | Dallas, TX 75205 | Oil Operator | Apr 2014 |
| 207 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Dec 2025 |
| 208 | Dobbins Family Residual Trust | Ardmore, OK 73401 | Oil Operator | Jul 2008 |
| 209 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 210 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 211 | Dorey Oil Corporation | Healdton, OK 73438-0856 | Oil Operator | Apr 2014 |
| 212 | Dotson Jack M Operating Co | Norman, OK 73072-6649 | Oil Operator | Oct 1993 |
| 213 | Douglas Oil & Gas Co Inc | Ada, OK 74820 | Oil Operator | Apr 2014 |
| 214 | Dunn Energy LLC | Skiatook, OK 74070-4046 | Oil Operator | Sep 2022 |
| 215 | E Lyle Johnson Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 216 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2025 |
| 217 | Eagle Minerals & Oil Prop Inc | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2002 |
| 218 | Eagle Minerals Inc | Tulsa, OK 74119 | Oil Operator | Jun 1998 |
| 219 | Echo E & P LLC | Oklahoma City, OK 73102-6439 | Oil & Gas Operator | Oct 2025 |
| 220 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 221 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2025 |
| 222 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 223 | Edwards Oil & Gas Company | Oklahoma City, OK 73156-0386 | Oil & Gas Operator | Mar 2015 |
| 224 | Edwards Production Inc | Healdton, OK 73438-6221 | Oil & Gas Operator | Mar 2015 |
| 225 | Egolf Operating Company | Oklahoma City, OK 73114-7899 | Oil & Gas Operator | Apr 1998 |
| 226 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | Oct 2025 |
| 227 | Eichenber A H Co | Tulsa, OK 74105 | Oil & Gas Operator | Oct 2002 |
| 228 | El Coqui' Oil Company | Tussy, OK 73088 | Oil & Gas Operator | Oct 2009 |
| 229 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 230 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Nov 2025 |
| 231 | Energy Exchange Corporation | Oklahoma City, OK 73112 | Oil Operator | Oct 2025 |
| 232 | Enernet Inc | Oklahoma City, OK 73102-8004 | Oil & Gas Operator | Nov 2014 |
| 233 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 234 | Epley Bobbie Inc | Wilson, OK 73463-6319 | Oil Operator | Jun 2007 |
| 235 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 236 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 237 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 238 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 239 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Oct 2025 |
| 240 | Fackrell & Associates LLC | Ardmore, OK 73402-1452 | Oil Operator | Aug 2025 |
| 241 | Farmers Energy Corporation | Tulsa, OK 74103-3525 | Oil & Gas Operator | Nov 2021 |
| 242 | FBF Energy LLC | Tulsa, OK 74120 | Oil & Gas Operator | Nov 2025 |
| 243 | Femco Services Inc | Lindsay, OK 73052-0632 | Oil & Gas Operator | Nov 2006 |
| 244 | Femco SWD Inc | Enid, OK 73702-3907 | Oil Operator | Mar 2014 |
| 245 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Dec 2025 |
| 246 | Fitzsimmons Randall W & Deborah S | Bartelsville, OK 74006 | Oil & Gas Operator | Nov 2025 |
| 247 | Fletcher Oil LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Nov 2025 |
| 248 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 249 | Forsythe Lawana | Wilson, OK 73463 | Oil Operator | Mar 2020 |
| 250 | Forsythe Trucking Inc | Wilson, OK 73463 | Oil & Gas Operator | Oct 2025 |
| 251 | Forte Energy Corpration | Houston, TX 77024-1209 | Oil & Gas Operator | Jan 1995 |
| 252 | Fossil Creek Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2025 |
| 253 | Fox Production Co LLC | Ardmore, OK 73401-6305 | Oil & Gas Operator | Aug 2009 |
| 254 | Fulcrum Exploration, LLC. | Flower Mound, TX 75028 | Oil & Gas Operator | Oct 2025 |
| 255 | G & N Oil & Gas LLC | Asher, OK 74826 | Oil & Gas Operator | Mar 2025 |
| 256 | G & S Production Company | Velma, OK 73491-0036 | Oil & Gas Operator | Oct 2021 |
| 257 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 258 | Gadsco Inc | Ardmore, OK 73402 | Gas Operator | Jun 2013 |
| 259 | Gay Drilling Contractors | Duncan, OK 73534-0457 | Oil & Gas Operator | Dec 2014 |
| 260 | George Taylor & Sons Oil LLC | Ringling, OK 73456 | Oil Operator | Nov 2025 |
| 261 | Gibson H F Estate | Dallas, TX 75250 | Oil & Gas Operator | Jul 1995 |
| 262 | Gilby Services LLC | Velma, OK 73491 | Oil & Gas Operator | Nov 2025 |
| 263 | Gill Jet C Dba Jetco Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Dec 2023 |
| 264 | Gilliland Oil And Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2025 |
| 265 | Gladiator Operating LLC | Ardmore, OK 73401 | Oil & Gas Operator | Nov 2025 |
| 266 | GLB Exploration Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2025 |
| 267 | Goggans William C | Pauls Valley, OK 73075-9759 | Oil & Gas Operator | Jun 2004 |
| 268 | Good Vaughn | Enid, OK 73702 | Oil & Gas Operator | Jul 2008 |
| 269 | Gopher Oil Company | | Oil & Gas Operator | Sep 2025 |
| 270 | Gothic Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2015 |
| 271 | Gothic Production Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2016 |
| 272 | Gouin Frank L | Oklahoma City, OK 73139-2513 | Oil Operator | Jan 2014 |
| 273 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 274 | Grand Production Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Aug 2000 |
| 275 | Granite Oil & Gas Inc | Phoenix, AZ 85045 | Oil Operator | Mar 1996 |
| 276 | Gray Operating Company, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Apr 2018 |
| 277 | Grayhorse Operating Inc | Tulsa, OK 74103-4438 | Oil & Gas Operator | Oct 2025 |
| 278 | Great Southwestern Expl Inc | Tulsa, OK 74105 | Oil & Gas Operator | Oct 2025 |
| 279 | Greehey & Company, LTD. | San Antonio, TX 78216 | Oil & Gas Operator | May 2020 |
| 280 | Gugli Corporation | Byng, OK 74820 | Oil & Gas Operator | Sep 2014 |
| 281 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2025 |
| 282 | Gulfport Midcon LLC | Oklahoma City, OK 73114-8132 | Oil & Gas Operator | Nov 2025 |
| 283 | Gunter Jim | Springer, OK 73458 | Oil Operator | Sep 2025 |
| 284 | Gypsyglenn Oil Company LLC | Tulsa, OK 74119-4809 | Oil & Gas Operator | Nov 2025 |
| 285 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 286 | Haines Oil Company | Sulphur, OK 73086 | Oil & Gas Operator | Oct 2009 |
| 287 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Oct 2025 |
| 288 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 289 | Ham Oil Company, LLC | | Oil Operator | Sep 2022 |
| 290 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 291 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 292 | Hays Production LLC | Velma, OK 73491 | Oil & Gas Operator | Oct 2025 |
| 293 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Sep 2025 |
| 294 | Henderson Fred J | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2025 |
| 295 | Henry Petroleum Of Oklahoma LP | Midland, TX 79703-5000 | Oil & Gas Operator | Feb 2017 |
| 296 | Hep Oil Company, LTD. | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 297 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 298 | Hibbert R E Estate Of | Houston, TX 77002-3211 | Oil & Gas Operator | Apr 2015 |
| 299 | Hikcott Oil | Wilson, OK 73463-6537 | Oil Operator | Jan 2014 |
| 300 | HMD Oil Co Inc | Ardmore, OK 73401-2542 | Oil & Gas Operator | Nov 2025 |