| 201 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | Mar 2025 |
| 202 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 203 | F.I.G. Energy, LLC | Livingston, TX 77399 | Oil & Gas Operator | Mar 2025 |
| 204 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 205 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Jan 2025 |
| 206 | Fenn, Bill Inc. | Giddings, TX 78942 | Oil & Gas Operator | Mar 2008 |
| 207 | Ffa Petroleum Services | Victoria, TX 77903 | Oil & Gas Operator | Sep 2001 |
| 208 | Ffa Petroleum Services, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2018 |
| 209 | Field Petroleum Corp. | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 210 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 211 | Finger Oil & Gas, Inc. | Castroville, TX 78009 | Oil & Gas Operator | May 2021 |
| 212 | First Aransas Reserves, Inc. | Alvin, TX 77511 | Oil & Gas Operator | Mar 2018 |
| 213 | Fischer Operating Corporation | Victoria, TX 77902 | Oil & Gas Operator | Jan 1999 |
| 214 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Mar 2025 |
| 215 | Flag Energy, LLC | Centerton, AR 72719 | Oil & Gas Operator | Nov 2018 |
| 216 | Formation Resources LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Mar 2025 |
| 217 | Fort Apache Energy, Inc. | Boerne, TX 78015 | Oil & Gas Operator | Mar 2025 |
| 218 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2025 |
| 219 | Fowler Oil & Gas LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Mar 2025 |
| 220 | Fox, Hewitt B., Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Mar 2025 |
| 221 | Franklin, J.W. Oil Operator | | Oil & Gas Operator | Nov 2001 |
| 222 | Frazier Resources Company | Houston, TX 77057 | Gas Operator | May 2004 |
| 223 | Fredco | Louise, TX 77455 | Oil & Gas Operator | Mar 2025 |
| 224 | Freddy'S Well Service, Inc. | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 225 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 226 | Frio Exploration Company | Pearland, TX 77588 | Oil & Gas Operator | Dec 2000 |
| 227 | Frostwood Energy, LLC | Houston, TX 77219 | Oil & Gas Operator | Mar 2025 |
| 228 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 229 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Mar 2025 |
| 230 | Garrison LTD. | San Antonio, TX 78257 | Oil & Gas Operator | Mar 2025 |
| 231 | Gary Oil & Gas | Deer Park, TX 77536 | Oil & Gas Operator | Mar 2025 |
| 232 | Gasper Rice Resources, LTD. | Houston, TX 77068 | Oil & Gas Operator | Mar 2025 |
| 233 | Gcea, LLC | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 234 | Gcer Onshore, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2015 |
| 235 | Gec Operating, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 236 | Gemarmi Inc. | Cypress, TX 77433 | Oil & Gas Operator | Mar 2025 |
| 237 | Genesis Crude Oil LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 238 | Geodominion Petroleum | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 2012 |
| 239 | Geonatural Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 240 | Gillring Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 1994 |
| 241 | Ginger Oil Company (A) | The Woodlands, TX 77380 | Oil & Gas Operator | Jan 2016 |
| 242 | Glenn, Wayne E. & Assoc., Inc. | Dickinson, TX 77539 | Oil & Gas Operator | Jun 2005 |
| 243 | Goldenrod Gas, Inc. | Victoria, TX 77904 | Gas Operator | Mar 2025 |
| 244 | Goldking Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2007 |
| 245 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 246 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | Mar 2025 |
| 247 | Goliad Operating Company | Houston, TX 77265 | Oil & Gas Operator | Aug 2003 |
| 248 | Good Earth Services LLC | Orchard, TX 77464 | Oil & Gas Operator | Mar 2025 |
| 249 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2025 |
| 250 | Great Texas Crude Inc. | Fredericksbrg, TX 78624 | Oil & Gas Operator | Mar 2025 |
| 251 | Greenbrier Oper. Co. | Dallas, TX 75229 | Oil & Gas Operator | Feb 2001 |
| 252 | Griffin Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | Mar 2025 |
| 253 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 254 | Gulfmark Energy Inc | Houston, TX 77027 | Gas Operator | Apr 2023 |
| 255 | Gulfstar Properties, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Mar 2025 |
| 256 | H Oil Company, Inc. | Edna, TX 77957 | Oil & Gas Operator | Mar 2005 |
| 257 | Haas, C. F. Oil & Gas Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Mar 2025 |
| 258 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2024 |
| 259 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Mar 2025 |
| 260 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 261 | Hanson Production Company | Cuero, TX 77954 | Oil & Gas Operator | Jul 2009 |
| 262 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 263 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 264 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 265 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 266 | Hemco Development, LLC | Dallas, TX 75201 | Oil & Gas Operator | Nov 2020 |
| 267 | HG Operating LLC | Plano, TX 75026 | Oil & Gas Operator | Mar 2025 |
| 268 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Mar 2025 |
| 269 | Hollimon Oil Corporation | Castroville, TX 78009 | Oil & Gas Operator | Nov 2016 |
| 270 | Houston Hydrocarbons, Inc. (A) | Houston, TX 77042 | Oil & Gas Operator | Sep 2004 |
| 271 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 272 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 273 | Howard Exploration, Inc. | Houston, TX 77069 | Oil & Gas Operator | Mar 2025 |
| 274 | Howell Drilling, Inc. | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2003 |
| 275 | Hughes Legacy LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2022 |
| 276 | Hughes, Dan A. Company | Beeville, TX 78104 | Oil & Gas Operator | May 2006 |
| 277 | Hugus Investment Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 278 | Hunt, Hassie Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 279 | Hunt, WM. Herbert, Trust Est. | Dallas, TX 75201 | Oil & Gas Operator | Sep 1998 |
| 280 | Hunter Petroleum Inc. | Alice, TX 78333 | Oil & Gas Operator | May 2014 |
| 281 | Hurd Enterprises, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 282 | Hydrocarbon Horizons, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jun 2023 |
| 283 | Hydrocarbon Operating, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 284 | Hyquest Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2015 |
| 285 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 286 | Indexgeo & Associates, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2009 |
| 287 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 288 | Infinity Hydrocarbons LLC | Houston, TX 77079 | Oil & Gas Operator | Aug 2022 |
| 289 | Inland Minerals Management, Inc. | Austin, TX 78701 | Oil & Gas Operator | Mar 2025 |
| 290 | Inland Ocean, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Mar 2025 |
| 291 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 292 | Island Exploration | Houston, TX 77058 | Oil & Gas Operator | Mar 2025 |
| 293 | Iwr Operating, LLC | Dallas, TX 75248 | Oil Operator | Mar 2025 |
| 294 | J G Oil & Gas | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 295 | J Posey Operating LLC | Dayton, TX 77535 | Oil & Gas Operator | Mar 2025 |
| 296 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Mar 2025 |
| 297 | J.R. Oil And Gas Inc. | Alvin, TX 77511 | Oil & Gas Operator | Mar 2025 |
| 298 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Mar 2025 |
| 299 | JL Resources, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2025 |
| 300 | Johnson & Ernst Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2018 |