| 201 | Eugene Talbert Operating Co. | | Oil & Gas Operator | Mar 2013 |
| 202 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 203 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 204 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Feb 2026 |
| 205 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 206 | Ferguson Oil Company Inc | | Oil & Gas Operator | Apr 1994 |
| 207 | Fife Oil Company, Inc. | | Oil & Gas Operator | Feb 2008 |
| 208 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 209 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | Feb 2026 |
| 210 | First Energy Corporation | | Oil & Gas Operator | Jun 1993 |
| 211 | First Energy Development Corp. | | Oil & Gas Operator | Sep 2008 |
| 212 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Feb 2026 |
| 213 | Flash Gas & Oil Northeast, Inc | | Oil & Gas Operator | May 2007 |
| 214 | Flex Energy, L.L.C. | | Oil & Gas Operator | Feb 2010 |
| 215 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 216 | FMP Operating Company, LTD PTN | | Oil & Gas Operator | Mar 1990 |
| 217 | Forcenergy Gas Exploration Inc. | Miami, FL 33129 | Oil & Gas Operator | Aug 1996 |
| 218 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 219 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 220 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Feb 2026 |
| 221 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2026 |
| 222 | Franks - Arkla | | Oil & Gas Operator | Jun 1985 |
| 223 | Franks Petroleum, Inc. Et Al | | Oil & Gas Operator | Oct 1989 |
| 224 | Freeport-McMoran Inc | New Orleans, LA 70160 | Oil & Gas Operator | Apr 1997 |
| 225 | Freeport-McMoran Oil & Gas Co. | | Oil & Gas Operator | Jan 1991 |
| 226 | Future Oil & Gas, Inc. | | Oil & Gas Operator | Mar 2010 |
| 227 | G. B. & F. Exploration, Inc. | | Oil & Gas Operator | Feb 1991 |
| 228 | Gap Energy, Inc. | | Oil & Gas Operator | Oct 1995 |
| 229 | Gde Investments La, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 230 | General American Oil Co Of TX | | Oil & Gas Operator | Jun 1983 |
| 231 | General Atlantic Energy Corp. | | Oil & Gas Operator | Nov 1988 |
| 232 | General Producing Co | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 233 | George R. Brown | | Oil & Gas Operator | Mar 1984 |
| 234 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 235 | Glasscock Drilling, Inc. | | Oil & Gas Operator | Dec 1977 |
| 236 | Goldking Onshore Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2016 |
| 237 | Goldking Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2007 |
| 238 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 239 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 240 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 241 | Graham Exploration, LTD. | | Oil & Gas Operator | Oct 1993 |
| 242 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 243 | Graham-McCormick Oper. PRTSHP. | | Oil & Gas Operator | Aug 1989 |
| 244 | Grease Exploration Incorporated | | Oil & Gas Operator | Dec 2024 |
| 245 | Great River Oil & Gas Corp. | | Oil & Gas Operator | Sep 1998 |
| 246 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 247 | Griffin Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | Feb 2026 |
| 248 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 249 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 250 | Gulfport Energy Corporation | Oklahoma City, OK 73114-5003 | Oil & Gas Operator | Aug 2025 |
| 251 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 252 | Hamon Oil Company | | Oil & Gas Operator | Aug 1985 |
| 253 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 254 | Harvest Oil & Gas, LLC | | Oil & Gas Operator | Feb 2012 |
| 255 | Hassie Hunt Expl. Co. | | Oil & Gas Operator | Aug 2008 |
| 256 | Hawthorne Oil And Gas Corp. | Houston, TX 77227 | Oil & Gas Operator | Sep 1993 |
| 257 | Hayden Energy Corp. | | Oil & Gas Operator | Apr 1994 |
| 258 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 259 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 260 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Nov 2025 |
| 261 | Hemco Development, LLC | Dallas, TX 75201 | Oil & Gas Operator | Nov 2020 |
| 262 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 263 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Feb 2026 |
| 264 | Hilliard Oil & Gas, Inc. | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 265 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 266 | Hogan Energy Corporation | | Oil & Gas Operator | Oct 1999 |
| 267 | Houston Energy Operating, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2020 |
| 268 | Houston Energy, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 269 | Houston Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 270 | Houston Oil Fields Company | | Oil & Gas Operator | Apr 1987 |
| 271 | Huffco Petroleum Corporation | | Oil & Gas Operator | Jul 1988 |
| 272 | Hugh A. Hawthorne, Et Al | | Oil & Gas Operator | Dec 1978 |
| 273 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 274 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 275 | Hunter Oil & Gas, LLC | | Oil & Gas Operator | Oct 2001 |
| 276 | I. H. Delatte | | Oil & Gas Operator | Jul 1991 |
| 277 | Iberia Operating Corporation | | Oil & Gas Operator | Jan 2003 |
| 278 | Imc Exploration Co. | | Oil & Gas Operator | Oct 1986 |
| 279 | Independent Expl Company | | Oil & Gas Operator | Dec 2000 |
| 280 | Indian Exploration, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2026 |
| 281 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 282 | Itr Petroleum Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 283 | J & R Systems, Inc. | | Oil Operator | Apr 2002 |
| 284 | J P Van Way | | Oil & Gas Operator | Dec 2024 |
| 285 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Feb 2026 |
| 286 | Jack Showacre | | Oil Operator | Jun 2002 |
| 287 | Jade Petroleum Inc. | | Oil & Gas Operator | May 1998 |
| 288 | Jake L. Hamon | | Oil & Gas Operator | Dec 1983 |
| 289 | James A. Whitson, Jr. | | Oil & Gas Operator | Apr 2016 |
| 290 | Janex Oil Co., Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jun 2005 |
| 291 | Japex (U.S.) Corp. | | Oil & Gas Operator | May 1998 |
| 292 | JMR Oil, Inc. | | Oil & Gas Operator | Sep 2006 |
| 293 | Joe W. Elsbury | | Oil & Gas Operator | Oct 1988 |
| 294 | Jones Company | | Oil & Gas Operator | Dec 1990 |
| 295 | Jones Company, LTD. | Albany, TX 76430 | Oil & Gas Operator | May 1999 |
| 296 | Jones Exploration Company | | Oil & Gas Operator | Jun 1985 |
| 297 | Jordan Oil Company, Inc. | Lake Charles, LA 70602 | Oil & Gas Operator | Dec 2019 |
| 298 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |
| 299 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Feb 2026 |
| 300 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | Feb 2026 |