| 201 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 202 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Mar 2025 |
| 203 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 204 | Engelke, R. H. | San Antonio, TX 78230 | Oil & Gas Operator | May 2025 |
| 205 | Enhanced Energy Partners Corp | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 206 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 207 | Ensign Operating LLC | Houston, TX 77086 | Oil & Gas Operator | Feb 2023 |
| 208 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 209 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 210 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 211 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 212 | Etoco, L.P. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 213 | Evans, Ralph | San Antonio, TX 78209 | Oil & Gas Operator | Jan 2011 |
| 214 | Evans, S. Lavon Jr. Oper. Co. | Laurel, MS 39442 | Oil & Gas Operator | May 2025 |
| 215 | Everest Minerals Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2001 |
| 216 | Everest Resource Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 2025 |
| 217 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | May 2025 |
| 218 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 219 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 220 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 221 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 222 | Field Petroleum Corp. | San Antonio, TX 78216 | Oil & Gas Operator | May 2025 |
| 223 | Fields Exploration, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 2015 |
| 224 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | May 2025 |
| 225 | Finger Oil & Gas, Inc. | Castroville, TX 78009 | Oil & Gas Operator | May 2021 |
| 226 | First Rock, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 227 | Fischer Operating Corporation | Victoria, TX 77902 | Oil & Gas Operator | Jan 1999 |
| 228 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 229 | Flamingo Oil & Gas | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 230 | Flournoy Production Co. | Alice, TX 78333 | Oil & Gas Operator | Dec 2002 |
| 231 | Force 4 Energy Resources, Inc. | Austin, TX 78733 | Oil & Gas Operator | Aug 2005 |
| 232 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 233 | Forney & McCombs | Houston, TX 77056 | Oil & Gas Operator | Jan 1998 |
| 234 | Forney Oil Corporation | Houston, TX 77056 | Oil & Gas Operator | Jan 1998 |
| 235 | Fourth Floor Operating LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 236 | Freeman, James C. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 2000 |
| 237 | Frio Exploration Company | Pearland, TX 77588 | Oil & Gas Operator | Dec 2000 |
| 238 | Galloway Lone Star, L.L.C. | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 239 | Geiser Operating, Inc. | Portland, TX 78374 | Oil & Gas Operator | Sep 2019 |
| 240 | Gemini Energy, Inc. | Kerens, TX 75144 | Oil Operator | May 2025 |
| 241 | Genesis Well Service | Colleyville, TX 76034 | Oil Operator | May 2025 |
| 242 | Ginco Operating Co. | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 243 | Go-Energy Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2002 |
| 244 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 245 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | May 2025 |
| 246 | Gouger Oil Company, LLC | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 247 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 248 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 249 | Greenbrier Oper. Co. | Dallas, TX 75229 | Oil & Gas Operator | Feb 2001 |
| 250 | Grizzly Op Of Delaware, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2021 |
| 251 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 252 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | Mar 2025 |
| 253 | Guinn Operating Company | Spring Branch, TX 78070 | Oil & Gas Operator | Feb 2014 |
| 254 | H & P Exploration Co. | Alice, TX 78333 | Oil & Gas Operator | May 2019 |
| 255 | H & T Oil & Gas Company, Inc. | Alice, TX 78333 | Oil & Gas Operator | Mar 2008 |
| 256 | Halex Oil Corporation | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 257 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 258 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 259 | Hanson Production Company | Cuero, TX 77954 | Oil & Gas Operator | Jul 2009 |
| 260 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 261 | Harper Hefte, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | May 2025 |
| 262 | Harrison Interests, LTD. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 263 | Hart Petroleum Services, Inc | Robstown, TX 78380 | Oil & Gas Operator | May 2025 |
| 264 | Harvey Brothers Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Jul 2004 |
| 265 | Harvey, Mike W. Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Aug 2003 |
| 266 | Harwood Exploration, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 1995 |
| 267 | Hawn Brothers | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2003 |
| 268 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 269 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 270 | Headwaters Energy Partners, LLC | Dripping SPGS, TX 78620 | Oil & Gas Operator | May 2025 |
| 271 | Hedrick Production Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 2025 |
| 272 | High Plains Gas Systems, Inc. | Houston, TX 77019 | Oil & Gas Operator | May 2025 |
| 273 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | May 2025 |
| 274 | Holden-Brooke Oil & Gas Co. | George West, TX 78022 | Oil & Gas Operator | Sep 2005 |
| 275 | Hollimon Oil Corporation | Castroville, TX 78009 | Oil & Gas Operator | Nov 2016 |
| 276 | Hollub, Lambert Drilling Company | Seguin, TX 78155 | Oil & Gas Operator | May 2025 |
| 277 | Hou-Tex, Inc. | Houston, TX 77224 | Oil & Gas Operator | Jun 2001 |
| 278 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | May 2025 |
| 279 | Hughes, Dan A. Company | Beeville, TX 78104 | Oil & Gas Operator | May 2006 |
| 280 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | May 2025 |
| 281 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 282 | Hunter & Hedrick Production, Inc | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Dec 1995 |
| 283 | Hunter Petroleum Inc. | Alice, TX 78333 | Oil & Gas Operator | May 2014 |
| 284 | Hurd Ent.LTD/U.S.Enercorp,LLC | San Antonio, TX 78209 | Oil & Gas Operator | Aug 2002 |
| 285 | Hurd Enterprises, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 286 | Hydrocarbon Operating, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 287 | Hyquest Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2015 |
| 288 | Indian Oil LTD. | Whitsett, TX 78075 | Oil & Gas Operator | May 2025 |
| 289 | Inland Ocean, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | May 2025 |
| 290 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 291 | J G Oil & Gas | Albany, TX 76430 | Oil & Gas Operator | May 2025 |
| 292 | J W Oil Co. | Cisco, TX 76437 | Oil & Gas Operator | May 2025 |
| 293 | Jamex II LTD., L.L.P. | Dallas, TX 75252 | Oil & Gas Operator | Sep 2002 |
| 294 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | May 2025 |
| 295 | Janssen, Wayne Allen | Runge, TX 78151 | Oil & Gas Operator | May 2010 |
| 296 | Jay-Dee Operating Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Aug 2000 |
| 297 | Jennings Exploration Company | Beeville, TX 78102 | Oil & Gas Operator | Feb 2024 |
| 298 | JJRS Investments Inc. | Corpus Chrsti, TX 78409 | Oil & Gas Operator | May 2025 |
| 299 | Jones, Edwin M. Oil Co. | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 300 | Jordan Oil Company, Inc. | Lake Charles, LA 70602 | Oil & Gas Operator | Dec 2019 |