| 27201 | South Central Petroleum, Inc. | | Oil & Gas Operator | Dec 1988 |
| 27202 | South Central Texas Oil & Gas Co | Houston, TX 77060 | Oil & Gas Operator | Nov 2025 |
| 27203 | South Coast Oil Corporation | Boulder, CO 80302 | Oil & Gas Operator | Oct 2015 |
| 27204 | South Coast Oil, Inc. | | Oil & Gas Operator | Jul 1989 |
| 27205 | South Florida Investment Company | Pampa, TX 79066 | Oil & Gas Operator | Jun 1997 |
| 27206 | South Fork Energy, LLC - (Ca) | | Oil Operator | Dec 2021 |
| 27207 | South Fork Ranch | | Oil & Gas Operator | Feb 2013 |
| 27208 | South Forty Energy, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Oct 1993 |
| 27209 | South Forty Inc (The) | Laverne, OK 73848 | Oil & Gas Operator | Mar 2015 |
| 27210 | South Heart Company | | Oil Operator | Aug 2010 |
| 27211 | South Houston Production Company | Muenster, TX 76252 | Oil & Gas Operator | Nov 2025 |
| 27212 | South La. Production Co., Inc. | | Oil & Gas Operator | Jun 1982 |
| 27213 | South Leeville, LLC | Houston, TX 77069 | Oil & Gas Operator | Oct 2022 |
| 27214 | South Loop Operating, L.C. | San Antonio, TX 78279 | Oil & Gas Operator | Apr 2009 |
| 27215 | South Oak Production Company | | Oil & Gas Operator | Jun 2010 |
| 27216 | South Of Briles | | Oil Operator | Aug 1989 |
| 27217 | South Oil, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 27218 | South Pass Petroleum Inc | Casper, WY 82601 | Oil & Gas Operator | Aug 2025 |
| 27219 | South Ranch Corporation | Midland, TX 79707 | Oil Operator | Sep 2019 |
| 27220 | South Ranch Oil | | Gas Operator | Dec 1990 |
| 27221 | South Ranch Oil Company Inc | St. Louis, MO 63124 | Oil Operator | Sep 1996 |
| 27222 | South River Operating, LLC | | Oil & Gas Operator | Dec 2016 |
| 27223 | South Romeo Gas Storage Company LLC | | Gas Operator | Feb 1994 |
| 27224 | South Sam Operating Company, LLC | Lakehills, TX 78063 | Oil Operator | Nov 2025 |
| 27225 | South Sands Exploration LLC | Henryetta, OK 74437-4208 | Oil & Gas Operator | Jul 2025 |
| 27226 | South Shore Energy LLC | Geneva, OH 44041 | Oil & Gas Operator | Dec 2024 |
| 27227 | South Texas Drilling & Expl, Inc | San Antonio, TX 78217 | Oil & Gas Operator | Jan 1999 |
| 27228 | South Texas Energy Production | Devine, TX 78016 | Oil & Gas Operator | Dec 1996 |
| 27229 | South Texas Injection Company | Mineral, TX 78125 | Oil & Gas Operator | Dec 2016 |
| 27230 | South Texas Limited Partnership | Houston, TX 77060 | Oil & Gas Operator | Feb 1994 |
| 27231 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Nov 2025 |
| 27232 | South Texas SWD, Inc. | Beeville, TX 78104 | Oil & Gas Operator | Aug 2003 |
| 27233 | South West Texas Oil & Gas, Inc. | Luling, TX 78648 | Oil & Gas Operator | Feb 2000 |
| 27234 | Southampton Mineral Corp. | | Oil & Gas Operator | Aug 2005 |
| 27235 | Southbound Gas Company | Dallas, TX 75201 | Gas Operator | Aug 2025 |
| 27236 | Southbrook Energies Inc | Tulsa, OK 74153 | Oil Operator | Feb 2004 |
| 27237 | Southco Oil And Gas Inc. | | Oil & Gas Operator | Nov 2000 |
| 27238 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | Nov 2025 |
| 27239 | Southcoast Resources, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2015 |
| 27240 | Southcreek Petroleum Co LLC | Blanchard, OK 73010-4911 | Oil & Gas Operator | Oct 2024 |
| 27241 | Southcross Operating LLC | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2005 |
| 27242 | Southeastern Gas Company | | Oil & Gas Operator | Dec 2019 |
| 27243 | Southeastern Oil & Gas Corp | | Oil Operator | Dec 2023 |
| 27244 | Southeastern Petroleum Inc | Roswell, NM BAD ADDR | Oil & Gas Operator | Dec 1995 |
| 27245 | Southeastern Pipe Line Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2020 |
| 27246 | Southeastern Producing Co | | Oil Operator | Jul 1988 |
| 27247 | Southeastern Public Service Co | | Oil & Gas Operator | Sep 1982 |
| 27248 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 27249 | Southerland Jackie Dale Dba Skyden Oil | Duncan, OK 73533-5392 | Oil & Gas Operator | Aug 2025 |
| 27250 | Southerland Joe Don Dba Taylor Oil Co | Duncan, OK 73533 | Oil & Gas Operator | Aug 2025 |
| 27251 | Southerland Marquieta Dba Keta Oil Company | Loco, OK 73442 | Oil & Gas Operator | Aug 2025 |
| 27252 | Southerland, Glenn Oil & Gas Co. | Hallsville, TX 75650 | Oil & Gas Operator | Feb 2021 |
| 27253 | Southern Alliance Oil Corp. | Grapevine, TX 76099 | Oil & Gas Operator | Nov 2025 |
| 27254 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 27255 | Southern California Gas Company | | Oil & Gas Operator | Sep 2025 |
| 27256 | Southern Crude, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2017 |
| 27257 | Southern Energy Operating Co Inc | | Oil Operator | Jun 2025 |
| 27258 | Southern Energy Operating, LLC | | Oil & Gas Operator | Aug 2025 |
| 27259 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 27260 | Southern G Holdings, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 27261 | Southern Gas Inc | | Gas Operator | Jan 1987 |
| 27262 | Southern Hills Gas Co. | | Oil Operator | May 2025 |
| 27263 | Southern Hydrocarbons Inc | | Oil & Gas Operator | Jul 1989 |
| 27264 | Southern Int'L Inc | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2007 |
| 27265 | Southern Management Inc | Camargo, OK 73835 | Oil Operator | Jun 1992 |
| 27266 | Southern Management Services | | Oil Operator | May 2017 |
| 27267 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 27268 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 27269 | Southern Natural Gas Company LLC | | Oil & Gas Operator | Nov 2024 |
| 27270 | Southern Oil & Gas Company | | Oil & Gas Operator | Mar 2011 |
| 27271 | Southern Oil & Gas LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Nov 2025 |
| 27272 | Southern Oil Of Louisiana LLC | Madisonville, LA 70447 | Oil & Gas Operator | Nov 2025 |
| 27273 | Southern Oklahoma Production | Wilson, OK 73463-6537 | Oil Operator | Jul 2025 |
| 27274 | Southern Operating Corporation | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 27275 | Southern Operating, Inc. | | Oil Operator | Dec 2000 |
| 27276 | Southern Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Nov 2025 |
| 27277 | Southern Petroleum Company | | Oil & Gas Operator | Jan 1994 |
| 27278 | Southern Production & Expl Co. | | Oil & Gas Operator | Apr 2008 |
| 27279 | Southern Production Co Inc | Madill, OK 73446 | Oil & Gas Operator | Jul 2025 |
| 27280 | Southern Production SVC., Inc. | | Oil Operator | Mar 1997 |
| 27281 | Southern Resource Company | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Mar 2022 |
| 27282 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jul 2025 |
| 27283 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 27284 | Southern Solutions And Services LLC | | Oil Operator | Dec 2014 |
| 27285 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | May 2025 |
| 27286 | Southern Star Operating LLC | Provo, UT 84604-7714 | Oil & Gas Operator | Jun 2017 |
| 27287 | Southern Star Operating, Inc. | | Oil & Gas Operator | Jun 2010 |
| 27288 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 27289 | Southern States Gas & Oil LTD | | Oil & Gas Operator | Jul 2004 |
| 27290 | Southern States Oil Production, LLC | | Oil & Gas Operator | Oct 2013 |
| 27291 | Southern States Petroleum Corp | | Oil Operator | Jan 1984 |
| 27292 | Southern Tejas Asset Group LLC | McAllen, TX 78501 | Oil & Gas Operator | Nov 2025 |
| 27293 | Southern Triangle Oil | | Oil & Gas Operator | Dec 2000 |
| 27294 | Southern Triangle Oil Co | MT Carmel, IL 62863 | Oil & Gas Operator | Dec 2023 |
| 27295 | Southern Union Exploration | | Oil Operator | Jan 1990 |
| 27296 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 27297 | Southern Union Production Co. | | Oil Operator | Apr 1979 |
| 27298 | Southern Water Disposal, LLC | | Oil & Gas Operator | Jan 2025 |
| 27299 | Southern Wells, Inc. | | Oil Operator | Sep 2002 |
| 27300 | Southern WV Oil & Gas | | Gas Operator | Dec 2021 |