| 201 | Dalf Energy LLC | Pampa, TX 79066 | Oil & Gas Operator | May 2025 |
| 202 | Dallas Petroleum Group, LLC | Dallas, TX 75379 | Oil & Gas Operator | May 2025 |
| 203 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 204 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 205 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | May 2025 |
| 206 | DDC Production Company | Archer City, TX 76351 | Oil Operator | May 2025 |
| 207 | De Larios, R. V., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 208 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 209 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | May 2025 |
| 210 | Del Mar | Holliday, TX 76366 | Oil & Gas Operator | May 2025 |
| 211 | Del Mar Energy, Inc. | Van Alstyne, TX 75495 | Oil & Gas Operator | May 2025 |
| 212 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 213 | Demoss, L. V. | Graham, TX 76450 | Oil & Gas Operator | May 2004 |
| 214 | Den-Kay Corp. | Plano, TX 75074 | Oil Operator | Aug 2009 |
| 215 | Denali Petroleum, LLC | Arlington, TX 76006 | Oil Operator | Mar 2021 |
| 216 | Denman-Friesen Co. | Lufkin, TX 75901 | Oil & Gas Operator | Nov 2006 |
| 217 | Denoco Inc. | Plano, TX 75086 | Oil & Gas Operator | Mar 2008 |
| 218 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | May 2025 |
| 219 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | May 2025 |
| 220 | Dick Lindsay Oil Company, Inc. | Graham, TX 76450 | Oil Operator | May 2025 |
| 221 | Dillard & Dillard Inc. | Holliday, TX 76366 | Oil & Gas Operator | May 2025 |
| 222 | Dimock Operating Company | Frisco, TX 75034 | Oil & Gas Operator | May 2025 |
| 223 | Dixie Drilling Company, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Nov 2011 |
| 224 | DM Backhoe Service | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 225 | Donnell, Louis, Jr. | South Bend, TX 76481 | Oil & Gas Operator | Mar 2008 |
| 226 | Double Barrel Operating Limited Liability Company | Wichita Falls, TX 76308 | Oil Operator | May 2025 |
| 227 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | May 2025 |
| 228 | Double K Production | Graham, TX 76450 | Oil & Gas Operator | Sep 2014 |
| 229 | Drennan, D. E. | Graham, TX 76450 | Oil & Gas Operator | Dec 2011 |
| 230 | Drillogix Exploration LLC | Breckenridge, TX 76424 | Oil Operator | May 2025 |
| 231 | Dry Fork Production Co | Wichita Falls, TX 76301 | Oil Operator | Apr 2003 |
| 232 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 233 | Duke Operating Company | Graham, TX 76450 | Oil Operator | May 2025 |
| 234 | Duncan Land & Exploration, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 235 | Dunlap, Rodge | Olney, TX 76374 | Oil & Gas Operator | Aug 2002 |
| 236 | Dym Energy, Inc. | Celina, TX 75009 | Oil & Gas Operator | Apr 2018 |
| 237 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | May 2025 |
| 238 | E & W Production | Olney, TX 76374 | Oil & Gas Operator | Aug 2018 |
| 239 | Eagle Natural Resources, LLC | Eunice, NM 88231 | Oil Operator | May 2025 |
| 240 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 241 | Ec Stryker Inc | Decatur, TX 76234 | Oil & Gas Operator | Dec 2015 |
| 242 | Ecapa Energy Company | Holliday, TX 76366 | Oil Operator | May 2025 |
| 243 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 244 | Edge Oil & Gas Properties | Archer City, TX 76351 | Oil & Gas Operator | May 2025 |
| 245 | Edge, Fred Well Service Co. | Archer City, TX 76351 | Oil & Gas Operator | May 2024 |
| 246 | Efficiency Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2008 |
| 247 | Efficiency Operating Service | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 248 | Eldorado Oil And Gas, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Nov 1995 |
| 249 | Elephant Oil & Gas, LLC | Dallas, TX 75204 | Oil & Gas Operator | Nov 2015 |
| 250 | Ellis, Amon | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 251 | Embassy Oil Company | Highland VLG, TX 75077 | Oil & Gas Operator | May 2025 |
| 252 | Energy Group Of America, Inc. | Hollister, MO 65672 | Oil Operator | May 2025 |
| 253 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 254 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | May 2025 |
| 255 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 256 | Engas Corporation | Jacksboro, TX 76458 | Oil & Gas Operator | May 2008 |
| 257 | Enloe Oil Company | Olney, TX 76374 | Oil & Gas Operator | Jun 2000 |
| 258 | Enr Operating, LLC | Eunice, NM 88231 | Oil & Gas Operator | May 2025 |
| 259 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 260 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 261 | Eratz Investments Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 262 | Ericksen, W.R. | Hobbs, NM 88240 | Oil & Gas Operator | Nov 1993 |
| 263 | Estacado Energy, LLC | Iowa Park, TX 76367 | Oil & Gas Operator | May 2025 |
| 264 | Estate Of C.B. Christie Jr | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 265 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 266 | Exlco, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 267 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 268 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | May 2025 |
| 269 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 270 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 271 | F & M Oil Company Inc | Pettus, TX 78146 | Oil & Gas Operator | May 2025 |
| 272 | F&H Operating Company LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 273 | F. H. B. Company | Holliday, TX 76366 | Oil & Gas Operator | May 2025 |
| 274 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 275 | Fair Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 2000 |
| 276 | Fair Oil, LC | Tyler, TX 75710 | Oil & Gas Operator | Oct 2001 |
| 277 | Fair Oil, LTD. | Tyler, TX 75710 | Oil & Gas Operator | May 2025 |
| 278 | Falls Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2025 |
| 279 | Farmer Operating, LLC | Olney, TX 76374 | Oil & Gas Operator | Dec 2019 |
| 280 | Farmer, Hayden | Olney, TX 76374 | Oil & Gas Operator | Feb 1997 |
| 281 | Farmer, Lewis & Hayden | Olney, TX 76374 | Oil & Gas Operator | Oct 2008 |
| 282 | Farrex, Inc. | Vernon, TX 76384 | Oil & Gas Operator | Oct 2008 |
| 283 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | May 2025 |
| 284 | Felty Drilling Co. Inc | Burkburnett, TX 76354 | Oil & Gas Operator | May 2025 |
| 285 | Fidelity Petroleum Corporation | Plano, TX 75074 | Oil & Gas Operator | May 2025 |
| 286 | Fin Energy, LLC | Wichita Falls, TX 76308 | Oil Operator | May 2025 |
| 287 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 288 | Finnell Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2009 |
| 289 | Finnell Oil Services, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 290 | Five States Energy Company | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 291 | Five States Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Feb 2008 |
| 292 | Flint Rock Resources MGMNT, Inc. | Austin, TX 78734 | Oil & Gas Operator | May 2025 |
| 293 | Four H Oil Properties | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 294 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 295 | Fresno Oil Company | Iowa Park, TX 76367 | Oil & Gas Operator | May 2025 |
| 296 | Fullspike Energy LLC | Boyd, TX 76023 | Oil & Gas Operator | May 2025 |
| 297 | G & F Oil, Inc. | Aledo, TX 76008 | Oil & Gas Operator | May 2025 |
| 298 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 299 | G&L Oil And Gas, LLC | Windthorst, TX 76389 | Oil & Gas Operator | May 2025 |
| 300 | G. A. Hawkins Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | May 2025 |