| 201 | McClinton & 4-M Invest Inc | | Oil & Gas Operator | Aug 1992 |
| 202 | McDowell And Cook, Inc. | | Oil Operator | Jan 1987 |
| 203 | McFarland Energy, Inc. | New Orleans, LA 70160 | Oil & Gas Operator | Dec 2009 |
| 204 | McMoran Oil & Gas LLC | New Orleans, LA 70160 | Oil & Gas Operator | Oct 2021 |
| 205 | McOr Oil Development, Inc. | | Oil & Gas Operator | Feb 1990 |
| 206 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Oct 2025 |
| 207 | Michel T. Halbouty Energy Co. | | Oil & Gas Operator | Nov 1986 |
| 208 | Michigan-Wisconsin Pipe Line Co | | Oil & Gas Operator | Dec 1983 |
| 209 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 210 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 211 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 212 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 213 | Nasser Oil & Gas, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 214 | National Energy Group, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 215 | NCM Operations, Inc. | | Oil Operator | Oct 2000 |
| 216 | Nerco Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1996 |
| 217 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 218 | Noex, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Apr 1998 |
| 219 | Northcott Exploration Co. Inc. | | Oil & Gas Operator | Dec 1987 |
| 220 | Northland Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2003 |
| 221 | Nugulf Operating, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 222 | O. D. Maybrier | | Oil Operator | Dec 2011 |
| 223 | Oil Country Management, Inc. | | Oil & Gas Operator | Jan 2005 |
| 224 | Oil Lift, Incorporated | Metairie, LA 70002 | Oil & Gas Operator | Apr 2020 |
| 225 | Oleum Operating Company, L.C. | Longview, TX 75606 | Oil & Gas Operator | Dec 2021 |
| 226 | Olympic Natural Gas Company | | Oil & Gas Operator | Oct 1990 |
| 227 | Olympic Production Company | | Oil & Gas Operator | Jul 1994 |
| 228 | Opmi Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2008 |
| 229 | Optimistic Oil Co. | | Oil & Gas Operator | Dec 1991 |
| 230 | Orb Exploration, L.L.C. | | Oil & Gas Operator | Jun 2017 |
| 231 | Oxy Petroleum Inc | | Oil & Gas Operator | Jan 1986 |
| 232 | P & A Well Service | | Oil & Gas Operator | Jan 1994 |
| 233 | Panotech Exploration Corp. | | Oil & Gas Operator | Jan 1983 |
| 234 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 235 | Paul M. Toce | | Oil & Gas Operator | Jul 1984 |
| 236 | Pengo Producing Company | | Oil & Gas Operator | Mar 1987 |
| 237 | Petro-Guard Production,L.L.C. | Houston, TX 77063 | Oil & Gas Operator | Dec 2024 |
| 238 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 239 | Petroleum Resources MGMT Corp. | | Oil & Gas Operator | Mar 2002 |
| 240 | Phillips Energy, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2018 |
| 241 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 242 | Pioneer Prod. Corp. | | Oil & Gas Operator | Jun 1986 |
| 243 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 244 | Plano Corp. | | Oil & Gas Operator | Mar 2005 |
| 245 | Presidio Energy, Inc. | | Oil & Gas Operator | Jan 1992 |
| 246 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 247 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 248 | Proteus Petroleum, Inc. | | Oil & Gas Operator | Nov 1983 |
| 249 | Puma, Inc. | | Oil & Gas Operator | Oct 2000 |
| 250 | R & B Oil Company, LLC Of Texas | | Oil & Gas Operator | Jan 2025 |
| 251 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 252 | Rental & Fishing Tools, Inc. | | Oil Operator | Dec 2024 |
| 253 | Rig Iron Petroleum Inc | | Oil & Gas Operator | Aug 1988 |
| 254 | River Bend Operating, Inc. | | Oil & Gas Operator | Jul 1999 |
| 255 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 256 | Rouxopco LLC | | Oil Operator | Dec 2024 |
| 257 | Roy M. Huffington, Inc. | | Oil & Gas Operator | Jul 1983 |
| 258 | Sandefer Petroleum Co. | | Oil & Gas Operator | Apr 1994 |
| 259 | Seaboard Pipe & Equip. Co. | | Oil & Gas Operator | May 1977 |
| 260 | Seaboard Well Service, Inc. | | Oil & Gas Operator | Jan 1978 |
| 261 | Senior G&A Operating Co Inc | | Oil & Gas Operator | Nov 1991 |
| 262 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |
| 263 | Shelf Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 264 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 265 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 266 | Sklar &Phillips-Great Southern | | Oil & Gas Operator | Aug 1980 |
| 267 | Sohio Petroleum Co. | Casper, WY 82602 | Oil & Gas Operator | Apr 1986 |
| 268 | Source Petroleum Inc. | San Antonio, TX 78265 | Oil & Gas Operator | Oct 2025 |
| 269 | Southeastern Public Service Co | | Oil & Gas Operator | Sep 1982 |
| 270 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 271 | Southern Production & Expl Co. | | Oil & Gas Operator | Apr 2008 |
| 272 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 273 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 274 | Southwest Oil Properties, Inc. | | Oil & Gas Operator | Feb 1996 |
| 275 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 276 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 277 | St. Paul Oil And Gas Corp. | | Oil & Gas Operator | Aug 1991 |
| 278 | Stone Petroleum Corporation | | Oil & Gas Operator | Dec 1996 |
| 279 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 280 | Summit Energy Company | | Oil & Gas Operator | Mar 2009 |
| 281 | T & M Gauging | | Oil Operator | Oct 2006 |
| 282 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 283 | Tepco Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Sep 2004 |
| 284 | Tepco, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 1999 |
| 285 | Terrier Oil Company | | Oil & Gas Operator | Feb 2015 |
| 286 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 287 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 288 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 289 | Texas Crude Oil Co. | | Oil & Gas Operator | Dec 1984 |
| 290 | Texas Crude Operator, Inc. | Houston, TX 77098 | Oil & Gas Operator | Aug 2017 |
| 291 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 292 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 293 | Texoma Production Co | | Oil & Gas Operator | Jun 1986 |
| 294 | The Cornell Corporation | Fort Worth, TX 76109 | Oil & Gas Operator | Sep 1993 |
| 295 | The Dow Chemical Company | | Oil & Gas Operator | Dec 1997 |
| 296 | The Meridian Res. & Exp. LLC | | Oil & Gas Operator | Sep 2010 |
| 297 | The Meridian Resource & Exp Co | | Oil & Gas Operator | Dec 2000 |
| 298 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Aug 2025 |
| 299 | Tiger Petroleum | | Oil Operator | Sep 2002 |
| 300 | Toce Oil Company | | Oil & Gas Operator | Dec 2014 |