| 201 | European-Southwest Co. | Houston, TX 77254 | Oil & Gas Operator | Mar 2025 |
| 202 | Everest Minerals Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2001 |
| 203 | Everest Resource Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Mar 2025 |
| 204 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | Mar 2025 |
| 205 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 206 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 207 | Falcon Bay Operations, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2007 |
| 208 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 209 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Jan 2025 |
| 210 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 211 | Ffa Petroleum Services | Victoria, TX 77903 | Oil & Gas Operator | Sep 2001 |
| 212 | Ffa Petroleum Services, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2018 |
| 213 | Field Petroleum Corp. | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 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 | Mar 2025 |
| 216 | Finger Oil & Gas, Inc. | Castroville, TX 78009 | Oil & Gas Operator | May 2021 |
| 217 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Mar 2025 |
| 218 | First Aransas Reserves, Inc. | Alvin, TX 77511 | Oil & Gas Operator | Mar 2018 |
| 219 | Firstrike Energy Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Jan 2025 |
| 220 | Fletcher Operating, LLC | Fairhope, AL 36533 | Oil & Gas Operator | Mar 2025 |
| 221 | Flint Interests, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 222 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 223 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2025 |
| 224 | Foundation Oil Company, Inc. | Kingwood, TX 77325 | Oil & Gas Operator | Mar 2025 |
| 225 | Fox, Hewitt B., Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Mar 2025 |
| 226 | Foxborough Energy Company, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 227 | Fredco | Louise, TX 77455 | Oil & Gas Operator | Mar 2025 |
| 228 | Freddy'S Well Service, Inc. | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 229 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 230 | Frio Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 231 | Frostwood Energy, LLC | Houston, TX 77219 | Oil & Gas Operator | Mar 2025 |
| 232 | Future Petroleum Company LLC | Houston, TX 77027 | Oil & Gas Operator | Jun 2013 |
| 233 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 234 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Mar 2025 |
| 235 | Gardner Energy Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 1999 |
| 236 | Garrison LTD. | San Antonio, TX 78257 | Oil & Gas Operator | Mar 2025 |
| 237 | Gary Oil & Gas | Deer Park, TX 77536 | Oil & Gas Operator | Mar 2025 |
| 238 | Gasper Rice Resources, LTD. | Houston, TX 77068 | Oil & Gas Operator | Mar 2025 |
| 239 | Gec Operating, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 240 | Geiser Operating, Inc. | Portland, TX 78374 | Oil & Gas Operator | Sep 2019 |
| 241 | Genesis Crude Oil LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 242 | Geodominion Petroleum | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 2012 |
| 243 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 244 | Geonatural Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 245 | Gillring Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 1994 |
| 246 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 247 | Goliad Operating Company | Houston, TX 77265 | Oil & Gas Operator | Aug 2003 |
| 248 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 249 | Great Texas Crude Inc. | Fredericksbrg, TX 78624 | Oil & Gas Operator | Mar 2025 |
| 250 | Great Western Onshore Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 251 | Greenbrier Oper. Co. | Dallas, TX 75229 | Oil & Gas Operator | Feb 2001 |
| 252 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 253 | Gulfmark Energy Inc | Houston, TX 77027 | Gas Operator | Apr 2023 |
| 254 | Gulfstar Properties, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Mar 2025 |
| 255 | H-M Resource Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2023 |
| 256 | Hall-Houston Oil Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 257 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 258 | Hardwick, Mark P. Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 1994 |
| 259 | Haring Energy Company | Tuleta, TX 78162 | Oil & Gas Operator | Mar 2003 |
| 260 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 261 | Hart Petroleum Services, Inc | Robstown, TX 78380 | Oil & Gas Operator | Mar 2025 |
| 262 | Hawn Brothers Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jan 2003 |
| 263 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 264 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 265 | Heartland Production, Inc. | Cuero, TX 77954 | Oil & Gas Operator | Mar 2025 |
| 266 | Hewitt, Robert J. | Victoria, TX 77901 | Oil & Gas Operator | Jun 2004 |
| 267 | Hibernia Resources, LLC | Houston, TX 77027 | Oil & Gas Operator | Jun 2014 |
| 268 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Mar 2025 |
| 269 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 270 | Hollimon Oil Corporation | Castroville, TX 78009 | Oil & Gas Operator | Nov 2016 |
| 271 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 272 | Horadam, Henry L. | Victoria, TX 77905 | Oil & Gas Operator | Oct 2008 |
| 273 | Hou-Tex, Inc. | Houston, TX 77224 | Oil & Gas Operator | Jun 2001 |
| 274 | Houston Gulf Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2025 |
| 275 | Houston Hydrocarbons, Inc. (A) | Houston, TX 77042 | Oil & Gas Operator | Sep 2004 |
| 276 | Howard Exploration, Inc. | Houston, TX 77069 | Oil & Gas Operator | Mar 2025 |
| 277 | Howell Drilling, Inc. | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2003 |
| 278 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 279 | HR Petroleum | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 1998 |
| 280 | Hughes Legacy LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2022 |
| 281 | Hughes, Dan A. Company | Beeville, TX 78104 | Oil & Gas Operator | May 2006 |
| 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 | Hunter Petroleum Inc. | Alice, TX 78333 | Oil & Gas Operator | May 2014 |
| 285 | Hurd Enterprises, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 286 | Hydrocarbon Horizons, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jun 2023 |
| 287 | Hyquest Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2015 |
| 288 | Indexgeo & Associates, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2009 |
| 289 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 290 | Inland Ocean, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Mar 2025 |
| 291 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Mar 2025 |
| 292 | Iwr Operating, LLC | Dallas, TX 75248 | Oil Operator | Mar 2025 |
| 293 | J G Oil & Gas | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 294 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Mar 2025 |
| 295 | J.R. Oil And Gas Inc. | Alvin, TX 77511 | Oil & Gas Operator | Mar 2025 |
| 296 | Jad Oil, Inc. | Hallettsville, TX 77964 | Oil & Gas Operator | Mar 2025 |
| 297 | James Energy Corporation | Houston, TX 77227 | Oil & Gas Operator | Jan 1996 |
| 298 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Mar 2025 |
| 299 | Janex Oil Co., Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jun 2005 |
| 300 | Janssen, Nelson | Victoria, TX 77904 | Oil & Gas Operator | Mar 2025 |