| 201 | D L Operating | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 202 | D. A. B. Oil Service, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2012 |
| 203 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 204 | Daily, Carroll | Loving, TX 76460 | Oil & Gas Operator | Sep 2023 |
| 205 | Daleco Resources, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Mar 2008 |
| 206 | Dales Oil Company | Loving, TX 76460 | Oil Operator | Apr 2024 |
| 207 | Dallas Petroleum Group, LLC | Dallas, TX 75379 | Oil & Gas Operator | Apr 2024 |
| 208 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Apr 2024 |
| 209 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 210 | Dallas Royalty, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2012 |
| 211 | Davis, Gowin | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2001 |
| 212 | Davis, R. E. Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2015 |
| 213 | Davis, Robert E. | Graham, TX 76450 | Oil & Gas Operator | Apr 1997 |
| 214 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 215 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 216 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 217 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | Apr 2024 |
| 218 | Del Mar Energy, Inc. | Van Alstyne, TX 75495 | Oil & Gas Operator | Apr 2024 |
| 219 | Delfin Operating, LLC | Dallas, TX 75243 | Oil & Gas Operator | Apr 2024 |
| 220 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 2024 |
| 221 | Demoss, L. V. | Graham, TX 76450 | Oil & Gas Operator | May 2004 |
| 222 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Apr 2024 |
| 223 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 224 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 225 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 226 | Devon Gas Services LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2023 |
| 227 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Apr 2024 |
| 228 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 229 | Dimock Operating Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 230 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 231 | DM Backhoe Service | Iowa Park, TX 76367 | Oil Operator | Apr 2024 |
| 232 | Doc'S Tank Trucks | Jacksboro, TX 76458 | Oil Operator | Jun 2007 |
| 233 | Dominion Natural Resources LLC | Dallas, TX 75367 | Oil & Gas Operator | Apr 2024 |
| 234 | Don Bar Investment Company | Windthorst, TX 76389 | Oil & Gas Operator | Feb 2004 |
| 235 | Don Peterson Company, LLC - | Loving, TX 76460 | Oil Operator | Apr 2024 |
| 236 | Dooley, Jeff | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2012 |
| 237 | Double Eagle Exploration Inc | Windthorst, TX 76389 | Oil Operator | Dec 2023 |
| 238 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Apr 2024 |
| 239 | Double L Operating | Graham, TX 76450 | Oil & Gas Operator | Nov 2018 |
| 240 | Douglas Investments Inc | Saginaw, TX 76179-0148 | Oil Operator | Jan 2020 |
| 241 | Dove Drilling, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 242 | Drennan, D. E. | Graham, TX 76450 | Oil & Gas Operator | Dec 2011 |
| 243 | Dry Creek Operating, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2024 |
| 244 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 245 | Dte Gas Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2007 |
| 246 | Dte Gas Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2014 |
| 247 | Dual Quiver Oil & Gas Op, LLC | Flower Mound, TX 75027 | Oil & Gas Operator | Apr 2024 |
| 248 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2024 |
| 249 | E & W Production | Olney, TX 76374 | Oil & Gas Operator | Aug 2018 |
| 250 | E-L Gas Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 251 | E.C. Hindman Oil And Gas | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 252 | Eagle Energy Acquisitions LP | Houston, TX 77002 | Oil & Gas Operator | Aug 2014 |
| 253 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 254 | Eagle Petroleum Corporation | Holliday, TX 76366 | Oil & Gas Operator | Oct 2005 |
| 255 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2024 |
| 256 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 257 | Ec Stryker Inc | Decatur, TX 76234 | Oil & Gas Operator | Dec 2015 |
| 258 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 259 | Edco Energy, Inc. | Austin, TX 78738 | Oil & Gas Operator | May 2003 |
| 260 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 261 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Apr 2024 |
| 262 | Elson Oil Company | Tulsa, OK 74103-4429 | Oil & Gas Operator | Dec 2016 |
| 263 | Emco Oil & Gas | Graham, TX 76450 | Oil & Gas Operator | Dec 1995 |
| 264 | Emco Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2002 |
| 265 | Emerald Petroleum Corporation | Dallas, TX 75244 | Oil & Gas Operator | Apr 2002 |
| 266 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 267 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 268 | Enerfin Resources II-92 L.P. | Houston, TX 77077 | Oil & Gas Operator | Apr 2024 |
| 269 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 270 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Apr 2024 |
| 271 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2024 |
| 272 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 273 | Engas Corporation | Jacksboro, TX 76458 | Oil & Gas Operator | May 2008 |
| 274 | Enlo Energy Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 275 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 276 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 277 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 278 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 279 | Ericksen, W.R. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 280 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Apr 2024 |
| 281 | Erwin Oil Company | Jacksboro, TX 76458 | Oil Operator | Apr 2024 |
| 282 | Erwin Operating | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 283 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 284 | Everest Energy LLC | Graham, TX 76450 | Oil & Gas Operator | Jun 2023 |
| 285 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Apr 2024 |
| 286 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 2023 |
| 287 | Exit Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Apr 2024 |
| 288 | Exorare Energy, Inc. | Dallas, TX 75218 | Oil & Gas Operator | Apr 2024 |
| 289 | Explo Oil Inc | Dallas, TX 75251 | Oil & Gas Operator | Apr 2024 |
| 290 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Apr 2024 |
| 291 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Apr 2024 |
| 292 | Extech Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Apr 2024 |
| 293 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 294 | F & R Oil Co. | Dallas, TX 75205 | Oil & Gas Operator | May 2005 |
| 295 | F B Operating, Inc. | Montague, TX 76251 | Oil & Gas Operator | Aug 2003 |
| 296 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 297 | Fairway Resources Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Aug 2022 |
| 298 | Faith Energy Exploration, Inc. | Ennis, TX 75119 | Oil & Gas Operator | Mar 2019 |
| 299 | Falcon Gas Storage Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2007 |
| 300 | Falcon Minerals, LTD. | Houston, TX 77057 | Oil & Gas Operator | May 2010 |