| 201 | Nerco Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1996 |
| 202 | Nicco Operating Co. | | Oil & Gas Operator | May 1990 |
| 203 | Nuex Operating, Inc. | | Oil Operator | Oct 2004 |
| 204 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 205 | Ody Oil Corp. | | Oil & Gas Operator | Oct 1994 |
| 206 | Offshore Oil & Gas Inc | Houston, TX 77063 | Oil & Gas Operator | Sep 1994 |
| 207 | Oil & Gas Property MGMT., Inc. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1996 |
| 208 | Opmi Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2008 |
| 209 | Orb Exploration, L.L.C. | | Oil & Gas Operator | Jun 2017 |
| 210 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 211 | Oxtex Inc | | Oil & Gas Operator | Oct 1989 |
| 212 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 213 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 214 | P. B. Operating Company | | Oil & Gas Operator | Feb 1978 |
| 215 | Panaco Production Co | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 216 | Panaco, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 217 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 218 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 219 | Pay Oil, L. L. C. | | Oil & Gas Operator | Jan 2025 |
| 220 | Pay Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 221 | Pay Ventures, L.L.C. | | Oil Operator | Dec 2024 |
| 222 | Penn VIrginia Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 223 | Perdido Energy Louisiana, LLC | | Oil & Gas Operator | Dec 2024 |
| 224 | Petro "E", LLC | | Oil & Gas Operator | Feb 2010 |
| 225 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 226 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 227 | Petrocorp | | Oil & Gas Operator | Nov 1992 |
| 228 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 229 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 230 | Phoenix Exploration Company LP | | Oil & Gas Operator | Sep 2011 |
| 231 | Phoenix Oil & Gas LTD., L.L.P. | Houston, TX 77010 | Oil & Gas Operator | Jun 2004 |
| 232 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 233 | Pioneer Prod. Corp. | | Oil & Gas Operator | Jun 1986 |
| 234 | Playa Oil & Gas, LP | | Oil & Gas Operator | Apr 2009 |
| 235 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 236 | Project Design Specialists Inc | | Oil & Gas Operator | May 1991 |
| 237 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 238 | R. Pannell Oil Company | Kilgore, TX 75663 | Oil Operator | Jan 2025 |
| 239 | Rapiere Resources Company | | Oil & Gas Operator | Aug 2024 |
| 240 | Reese Energy Corp. | | Oil & Gas Operator | Oct 1991 |
| 241 | Renaissance Petroleum Co LLC | Houston, TX 77058 | Oil & Gas Operator | Nov 2011 |
| 242 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 243 | Robert C. Pettit | | Oil & Gas Operator | Feb 1986 |
| 244 | Rouxopco LLC | | Oil Operator | Dec 2024 |
| 245 | Russell Resources, Inc. | | Oil & Gas Operator | Dec 1998 |
| 246 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 247 | Sandefer Petroleum Co. | | Oil & Gas Operator | Apr 1994 |
| 248 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Oct 2025 |
| 249 | Sandridge Onshore, LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2014 |
| 250 | Seahawk Oil & Gas Company | Dallas, TX 75379 | Oil & Gas Operator | Aug 2007 |
| 251 | Sealexco | | Oil & Gas Operator | Jun 1992 |
| 252 | Sealexco-Crescent Drilling | | Oil & Gas Operator | May 1986 |
| 253 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 254 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 255 | Shoreline Offshore LLC | | Oil & Gas Operator | Jun 2017 |
| 256 | Shoreline Southeast LLC | | Oil & Gas Operator | Jun 2017 |
| 257 | Skelly Oil Co | | Oil & Gas Operator | Mar 2005 |
| 258 | Sonora Producing, Inc. | | Oil & Gas Operator | May 2006 |
| 259 | Sound Resources Corporation | | Oil & Gas Operator | Dec 2003 |
| 260 | Source Petroleum Inc. | San Antonio, TX 78265 | Oil & Gas Operator | Oct 2025 |
| 261 | South Oak Production Company | | Oil & Gas Operator | Jun 2010 |
| 262 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 263 | Spirit Petroleum Company | | Oil & Gas Operator | Apr 1999 |
| 264 | Spooner Petroleum Company | | Oil & Gas Operator | Jul 2025 |
| 265 | Square Mile Energy, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 266 | SRP Production Corp. | | Oil & Gas Operator | Nov 1997 |
| 267 | St. Croix Corporation | | Oil & Gas Operator | Apr 1990 |
| 268 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 269 | Stone Oil Corp-Forest Oil Corp | | Oil & Gas Operator | Jan 1983 |
| 270 | Stone Oil-Lamson-Onshore Pet. | | Oil & Gas Operator | May 1985 |
| 271 | Stone Petroleum Corporation | | Oil & Gas Operator | Dec 1996 |
| 272 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 273 | Summit Energy Company | | Oil & Gas Operator | Mar 2009 |
| 274 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 275 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |
| 276 | Swift Energy Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2017 |
| 277 | Tabco Exploration Inc. | New Orleans, LA 70131 | Oil & Gas Operator | Dec 1998 |
| 278 | Taylor Energy Co. | | Oil & Gas Operator | May 1991 |
| 279 | Tee Operating Company | | Oil & Gas Operator | Jun 1989 |
| 280 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 281 | Tesla Resources, Inc. | | Oil & Gas Operator | Aug 1996 |
| 282 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 283 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 284 | Texas Crude Exploration, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Aug 1992 |
| 285 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 286 | Texas Gas Transmission Corp. | | Oil Operator | Aug 2003 |
| 287 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 288 | The Meridian Res. & Exp. LLC | | Oil & Gas Operator | Sep 2010 |
| 289 | The Meridian Resource & Exp Co | | Oil & Gas Operator | Dec 2000 |
| 290 | The Stone Oil Corporation | | Oil & Gas Operator | May 1985 |
| 291 | The WM G Helis Company, L.L.C. | | Oil & Gas Operator | Nov 2003 |
| 292 | Thrall Texas Oil, LLC | | Oil & Gas Operator | Jan 2025 |
| 293 | Tiger Petroleum | | Oil Operator | Sep 2002 |
| 294 | Toce Oil Company | | Oil & Gas Operator | Dec 2014 |
| 295 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 296 | Transco Exploration Company | | Oil & Gas Operator | Jul 1989 |
| 297 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 298 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 299 | TXP Operating Company | | Oil & Gas Operator | Jul 1992 |
| 300 | U.S. Capital Corp Of Am, Inc. | | Oil & Gas Operator | Aug 1998 |