| 201 | Davis Oil & Gas, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2011 |
| 202 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 203 | Delek Energy Systems Us Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 204 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 205 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 206 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 207 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 208 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | May 2025 |
| 209 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | May 2025 |
| 210 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 211 | Donnell Pipe & Supply Co/TX Corp | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2008 |
| 212 | Dorado Operating Inc. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2011 |
| 213 | Dowden, T. L. | Henderson, TX 75652 | Oil & Gas Operator | May 2025 |
| 214 | DPMP Energy LLC | Prosper, TX 75078 | Oil & Gas Operator | Dec 2023 |
| 215 | Dunbar, Ron, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2012 |
| 216 | Durango Resources Corp. | Houston, TX 77043 | Oil & Gas Operator | May 2025 |
| 217 | Dyersdale Energy, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 218 | Earthbound Energy LLC | Merkel, TX 79536 | Oil Operator | May 2025 |
| 219 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | May 2025 |
| 220 | Eastex Operating, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2003 |
| 221 | Eastland Exploration, Inc. | Austin, TX 78763 | Oil & Gas Operator | Apr 1997 |
| 222 | Edmonds, Karl F. Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2005 |
| 223 | Eex E&P Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 224 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 225 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 226 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |
| 227 | Ellis Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | May 2025 |
| 228 | Elms Oil Company | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 229 | Embassy Well Service, LLC | Carrollton, TX 75011 | Oil & Gas Operator | May 2025 |
| 230 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 231 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 232 | Enduring Resources, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2025 |
| 233 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 234 | Energen Resources Maq Inc | Birmingham, AL 35203 | Oil & Gas Operator | Sep 2000 |
| 235 | Energy 2000, Inc. | Reno, NV 89501 | Oil & Gas Operator | May 2025 |
| 236 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 237 | Enerquest Corporation | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 238 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 239 | Enerquest Operating, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2025 |
| 240 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 241 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 242 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 243 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 244 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 245 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 246 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 247 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 248 | Etos Operating, Inc. | New London, TX 75682 | Oil & Gas Operator | May 2025 |
| 249 | Ev Fleming Enterprises, LLC | Kilgore, TX 75662 | Oil & Gas Operator | Aug 2024 |
| 250 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | May 2025 |
| 251 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 252 | Exco Partners Operating PTSHP LP | Dallas, TX 75251 | Oil & Gas Operator | Jan 2009 |
| 253 | Exco Production Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Dec 2009 |
| 254 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Feb 2025 |
| 255 | Executive Production, Inc. | Tyler, TX 75713 | Oil & Gas Operator | May 2025 |
| 256 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 257 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 258 | Exzena Oil Corp. | Tyler, TX 75713 | Oil & Gas Operator | May 2025 |
| 259 | Fair Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 2000 |
| 260 | Fair Oil, LC | Tyler, TX 75710 | Oil & Gas Operator | Oct 2001 |
| 261 | Fair Oil, LTD. | Tyler, TX 75710 | Oil & Gas Operator | May 2025 |
| 262 | Fair Operating, Inc. | Boerne, TX 78015 | Oil & Gas Operator | May 2025 |
| 263 | Fairway Operating, Inc. | Lake Jackson, TX 77566 | Oil & Gas Operator | May 2025 |
| 264 | Falcon Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2021 |
| 265 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 266 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 267 | Federal Oil, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | May 2025 |
| 268 | Fidelity Explor. & Prod. Co. | Denver, CO 80202 | Oil & Gas Operator | Nov 2015 |
| 269 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 270 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | May 2025 |
| 271 | First Reserve Oil & Gas Co | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 272 | First Texas Exploration Corp. | Arcadia, LA 71001 | Oil & Gas Operator | Aug 2003 |
| 273 | Fisher, L. C. Jr. | Longview, TX 75608 | Oil & Gas Operator | May 1993 |
| 274 | Flat Creek Operating Co. | Rockwall, TX 75087 | Oil & Gas Operator | Jun 2004 |
| 275 | Flint Pipeline Company | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 276 | Floyd Operating Company | Houston, TX 77002 | Oil & Gas Operator | Jul 2004 |
| 277 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 278 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 279 | Fortune Natural Resources Corp. | Houston, TX 77067 | Oil & Gas Operator | Dec 2003 |
| 280 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 281 | Four Diamond Operating, LLC | Kilgore, TX 75663 | Oil Operator | May 2025 |
| 282 | Fourway Oil Company | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 283 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 284 | Ful-Hill Oil & Gas, Inc. | Marshall, TX 75670 | Oil & Gas Operator | Aug 2003 |
| 285 | Ful-Hill Oil & Gas, L.L.P. | Overton, TX 75684 | Oil & Gas Operator | Jun 2016 |
| 286 | Fullspike Energy LLC | Boyd, TX 76023 | Oil & Gas Operator | May 2025 |
| 287 | Galloway Lone Star, L.L.C. | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 288 | Genecov Group, Inc. The | Tyler, TX 75713 | Oil & Gas Operator | Dec 2002 |
| 289 | Genepa Petroleum Company | Spring, TX 77379 | Oil & Gas Operator | May 2025 |
| 290 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 291 | Geo Logic Environmental SRVCS LC | Kilgore, TX 75663 | Oil Operator | Dec 2011 |
| 292 | Geo-Vest Of Texas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2008 |
| 293 | Geonatural Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 294 | GGP Exploration, LTD. | Fort Worth, TX 76101 | Oil & Gas Operator | May 2025 |
| 295 | Gilbert, A. A. | Shreveport, LA 71133 | Oil & Gas Operator | Mar 1997 |
| 296 | Gilbert,A.A.TX Acct/Partnership | Shreveport, LA 71133 | Oil Operator | May 2025 |
| 297 | Glade Operating Co. | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 298 | Glade Production | Gladewater, TX 75647 | Oil & Gas Operator | Nov 2008 |
| 299 | Glassell, Alfred C., Jr. | Houston, TX 77002 | Oil & Gas Operator | Apr 2007 |
| 300 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2025 |