| 201 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 202 | Evans, Julian | Houston, TX 77024 | Oil & Gas Operator | Nov 1995 |
| 203 | Everest Minerals Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2001 |
| 204 | Everest Resource Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jul 2025 |
| 205 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 206 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Jul 2025 |
| 207 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | Jul 2025 |
| 208 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 209 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 210 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Jul 2025 |
| 211 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 212 | Field Petroleum Corp. | San Antonio, TX 78216 | Oil & Gas Operator | Jul 2025 |
| 213 | Fields Exploration, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 2015 |
| 214 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 215 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | Jul 2025 |
| 216 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Jul 2025 |
| 217 | First Rock, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2025 |
| 218 | Firstrike Energy Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Jan 2025 |
| 219 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Jul 2025 |
| 220 | Fletcher Operating, LLC | Fairhope, AL 36532 | Oil & Gas Operator | Jul 2025 |
| 221 | Flournoy Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 222 | Foothill Energy, LLC | Spring, TX 77393 | Oil & Gas Operator | Jul 2025 |
| 223 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 224 | Forney Oil Corporation | Houston, TX 77056 | Oil & Gas Operator | Jan 1998 |
| 225 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jul 2025 |
| 226 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Jul 2025 |
| 227 | Four C Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2024 |
| 228 | Fowler Oil & Gas LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Jul 2025 |
| 229 | Freddy'S Well Service, Inc. | Victoria, TX 77902 | Oil & Gas Operator | May 2025 |
| 230 | Freeport-McMoran Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 231 | Frio Engineering Inc. | Houston, TX 77066 | Oil & Gas Operator | Jul 2025 |
| 232 | Frio Production Co. | Alice, TX 78333 | Oil & Gas Operator | Sep 1998 |
| 233 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 234 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Jul 2025 |
| 235 | Garrison LTD. | San Antonio, TX 78257 | Oil & Gas Operator | Jul 2025 |
| 236 | Gasper Rice Resources, LTD. | Houston, TX 77068 | Oil & Gas Operator | Jul 2025 |
| 237 | Gcea, LLC | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 238 | Geiselman, Grover J. | Richmond, TX 77469 | Oil & Gas Operator | Feb 1995 |
| 239 | Geiser Operating, Inc. | Portland, TX 78374 | Oil & Gas Operator | Sep 2019 |
| 240 | Geiser, D. Allen | Portland, TX 78374 | Oil & Gas Operator | Oct 2005 |
| 241 | Geodominion Petroleum | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 2012 |
| 242 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 243 | Geosouthern Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Jul 2025 |
| 244 | Gillring Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 1994 |
| 245 | Global Natural Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | May 1998 |
| 246 | Go-Energy Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2002 |
| 247 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 248 | Goodnight Midstream Permian, LLC | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 249 | Goodrich Pet. Co. Of Louisiana | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 250 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 251 | Graward Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Jul 2025 |
| 252 | Green River Resources Inc. | Keystone, CO 80435 | Oil & Gas Operator | Jul 2025 |
| 253 | Greenbrier Oper. Co. | Dallas, TX 75229 | Oil & Gas Operator | Feb 2001 |
| 254 | Gribble Oil Corporation | Dallas, TX 75235 | Oil Operator | Aug 1994 |
| 255 | Griffin Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 256 | Grizzly Op Of Delaware, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2021 |
| 257 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 258 | Gulfstar Properties, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Jul 2025 |
| 259 | Gulftex Energy, LLC | San Antonio, TX 78257 | Oil & Gas Operator | Jul 2025 |
| 260 | Haber Resources Corporation | Houston, TX 77063 | Oil & Gas Operator | Mar 1999 |
| 261 | Halex Oil Corporation | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 262 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 263 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 264 | Hanson Production Company | Cuero, TX 77954 | Oil & Gas Operator | Jul 2009 |
| 265 | Harper Hefte, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Jul 2025 |
| 266 | Hart Petroleum Services, Inc | Robstown, TX 78380 | Oil & Gas Operator | Jul 2025 |
| 267 | Harvey, Mike W. Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Aug 2003 |
| 268 | Harwood Exploration, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 1995 |
| 269 | Heartland Production, Inc. | Cuero, TX 77954 | Oil & Gas Operator | Jul 2025 |
| 270 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Jul 2025 |
| 271 | Hoc Operating Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Nov 1999 |
| 272 | Hou-Tex, Inc. | Houston, TX 77224 | Oil & Gas Operator | Jun 2001 |
| 273 | Houston Gulf Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Jul 2025 |
| 274 | Howard Exploration, Inc. | Houston, TX 77069 | Oil & Gas Operator | Jul 2025 |
| 275 | Howard, Douglas J. | Houston, TX 77070 | Oil & Gas Operator | Mar 2008 |
| 276 | Howell Drilling, Inc. | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2003 |
| 277 | HR Petroleum | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 1998 |
| 278 | HRH Energy Group Incorporated | Carrollton, TX 75006 | Oil & Gas Operator | Nov 2009 |
| 279 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Jul 2025 |
| 280 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Jul 2025 |
| 281 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 282 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 283 | Hunt, WM. Herbert, Trust Est. | Dallas, TX 75201 | Oil & Gas Operator | Sep 1998 |
| 284 | Hurd Enterprises, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2025 |
| 285 | Hydrocarbon Horizons, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jun 2023 |
| 286 | Hydrocarbon Operating, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2025 |
| 287 | Hyquest Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2015 |
| 288 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 289 | Indexgeo & Associates, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2009 |
| 290 | Inland Ocean, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Jul 2025 |
| 291 | Intercity Management Corp. | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Jul 2025 |
| 292 | Intercoastal Energy, Inc. | Houston, TX 77055 | Oil & Gas Operator | Aug 2003 |
| 293 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 294 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Jul 2025 |
| 295 | Ipr USA Corp. | Irving, TX 75039 | Oil & Gas Operator | Jun 2009 |
| 296 | Island Exploration | Houston, TX 77058 | Oil & Gas Operator | Jul 2025 |
| 297 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Jul 2025 |
| 298 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Jul 2025 |
| 299 | J.R. Oil And Gas Inc. | Alvin, TX 77511 | Oil & Gas Operator | Jul 2025 |
| 300 | J.W. Service Company | Smithville, TX 78957 | Oil & Gas Operator | Jul 2025 |