| 4201 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 4202 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 4203 | Sand Hill, LTD. | | Gas Operator | Dec 2024 |
| 4204 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 4205 | Sandefer & Andress, Inc. | | Oil & Gas Operator | Apr 1982 |
| 4206 | Sandefer Petroleum Co. | | Oil & Gas Operator | Apr 1994 |
| 4207 | Sandel Energy, Inc. | Huntsville, TX 77342 | Oil & Gas Operator | Apr 2004 |
| 4208 | Sandhill Production Inc | Shongaloo, LA 71072 | Oil & Gas Operator | Dec 2019 |
| 4209 | Sandpoint Energy Partners LLC | | Oil Operator | Jan 2025 |
| 4210 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Feb 2026 |
| 4211 | Sandridge Onshore, LLC | Houston, TX 77010 | Oil & Gas Operator | Jun 2014 |
| 4212 | Santa Fe Braun Inc | Dallas, TX 75240-6620 | Oil & Gas Operator | Mar 1995 |
| 4213 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 4214 | Santa Fe Energy Operg Parts LP | | Oil & Gas Operator | Nov 1993 |
| 4215 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 4216 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 4217 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 4218 | Santa Fe-Andover Oil Co | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2000 |
| 4219 | Santana Exploration, Inc. | | Oil & Gas Operator | Dec 1985 |
| 4220 | Sante Fe Minerals | | Oil & Gas Operator | Dec 1987 |
| 4221 | Santo Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 4222 | Santos USA Corp. | Houston, TX 77042 | Oil & Gas Operator | Dec 2008 |
| 4223 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 4224 | Sasha Petroleum, Inc | | Oil Operator | Jan 1986 |
| 4225 | Savant Energy Corporation | | Oil & Gas Operator | Mar 2012 |
| 4226 | Sawyer Drilling & Service Inc. | | Oil & Gas Operator | Oct 2004 |
| 4227 | Sawyer Energy, Inc. | | Oil & Gas Operator | May 1997 |
| 4228 | Saxon Oil & Gas Expl., Inc. | | Gas Operator | Nov 1989 |
| 4229 | Saxon Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Oct 2009 |
| 4230 | Saye Petroleum, Inc. | | Oil & Gas Operator | Apr 1995 |
| 4231 | Sayes Drilling Inc. | | Oil Operator | May 1987 |
| 4232 | SBM Operating Company Inc. | | Gas Operator | Sep 1997 |
| 4233 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 4234 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 4235 | Sceptre Resources Inc | | Oil & Gas Operator | Dec 2007 |
| 4236 | Schmid Properties, Inc. | Hico, TX 76457 | Oil & Gas Operator | Feb 2026 |
| 4237 | Scogin Exploration Inc | | Oil & Gas Operator | Dec 1999 |
| 4238 | Scorpion Oil & Gas, LLC | Houston, TX 77036 | Oil & Gas Operator | May 2025 |
| 4239 | Scott W. Brumley | | Oil Operator | Apr 2011 |
| 4240 | Scurlock Oil Co | | Oil Operator | May 1982 |
| 4241 | SDG Services LLC | Kilgore, TX 75663 | Oil Operator | Sep 2025 |
| 4242 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 4243 | Seaboard Pipe & Equip. Co. | | Oil & Gas Operator | May 1977 |
| 4244 | Seaboard Well Service, Inc. | | Oil & Gas Operator | Jan 1978 |
| 4245 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 4246 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 4247 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 4248 | Seahawk Oil & Gas Company | Dallas, TX 75379 | Oil & Gas Operator | Aug 2007 |
| 4249 | Seal Energy Company | | Oil Operator | Dec 2024 |
| 4250 | Sealexco | | Oil & Gas Operator | Jun 1992 |
| 4251 | Sealexco-Crescent Drilling | | Oil & Gas Operator | May 1986 |
| 4252 | Seawide Limited | | Oil & Gas Operator | Jul 1983 |
| 4253 | Secan Oil Co Inc | | Oil & Gas Operator | May 1987 |
| 4254 | Secan Oil Co., Inc.-Pennington | | Oil & Gas Operator | May 1987 |
| 4255 | Secondary Recovery, Inc. | | Oil & Gas Operator | Dec 1991 |
| 4256 | Sedona Oil & Gas Corporation | Dallas, TX 75231 | Oil & Gas Operator | Feb 2026 |
| 4257 | Segars Energy | | Gas Operator | Mar 2001 |
| 4258 | Segars Operating | | Gas Operator | Apr 2014 |
| 4259 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | Feb 2026 |
| 4260 | Semo, Inc. | | Oil & Gas Operator | Feb 2002 |
| 4261 | Sendero Energy Inc. | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 4262 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 4263 | Seneca-Cashco | | Oil & Gas Operator | Sep 1986 |
| 4264 | Senior Drilling & Expl Co Inc. | | Oil & Gas Operator | Apr 1993 |
| 4265 | Senior G&A Operating Co Inc | | Oil & Gas Operator | Nov 1991 |
| 4266 | Sensor Oil & Gas, Inc. | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 4267 | Sepulvado Oilfield Service Inc | | Oil & Gas Operator | Jul 2010 |
| 4268 | Serio Energy Corporation | | Oil & Gas Operator | Jul 2000 |
| 4269 | Serio Exploration Company | | Oil Operator | Jan 1992 |
| 4270 | Serio Oil Corp. | | Oil & Gas Operator | Sep 1991 |
| 4271 | Serio Operating Co. | | Oil & Gas Operator | Mar 2007 |
| 4272 | Ses Production | | Oil & Gas Operator | Oct 2023 |
| 4273 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 4274 | Settco Oil & Gas | | Oil & Gas Operator | May 1994 |
| 4275 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |
| 4276 | Sewell Development Co Inc | | Oil & Gas Operator | Apr 1993 |
| 4277 | SG Interests, Inc. | Houston, TX 77010 | Oil & Gas Operator | Jun 2007 |
| 4278 | Shadrack Production Company | | Gas Operator | Dec 1982 |
| 4279 | Shale Energy International, LLC | | Oil & Gas Operator | Nov 2024 |
| 4280 | Shana Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2002 |
| 4281 | Shannon Williams | | Oil Operator | Jan 1993 |
| 4282 | Shaw-Laird, LLC | | Oil & Gas Operator | Jan 2017 |
| 4283 | Shelby H. Loe, SR. Oil Co. | | Oil Operator | Jul 1989 |
| 4284 | Shelby Operating Company | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 4285 | Shelf Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 4286 | Shell Offshore Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 2008 |
| 4287 | Shell Oil Co. | Houston, TX 77001 | Oil & Gas Operator | Jun 1985 |
| 4288 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 4289 | Shenandoah Oil Corporation | | Oil & Gas Operator | Jun 1979 |
| 4290 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 4291 | Shield Energy Resources, LLC | | Oil Operator | Dec 2024 |
| 4292 | Shiloh Creek Resources, Inc. | | Gas Operator | Nov 2024 |
| 4293 | Sho-Van Gas Producing Co. | | Gas Operator | Aug 1990 |
| 4294 | Shocker Energy, Inc. | | Oil & Gas Operator | Oct 1992 |
| 4295 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 4296 | Shongaloo Midstream, LLC | | Oil Operator | Mar 2019 |
| 4297 | Shore Oil Company | | Oil & Gas Operator | May 1998 |
| 4298 | Shoreline Exploration Of Texas | | Oil & Gas Operator | Oct 2000 |
| 4299 | Shoreline Exploration, Inc. | | Oil & Gas Operator | Jul 1990 |
| 4300 | Shoreline GP LLC | | Oil & Gas Operator | Jun 2012 |