| 27301 | South Heart Company | | Oil Operator | Aug 2010 |
| 27302 | South Houston Production Company | Muenster, TX 76252 | Oil & Gas Operator | Jul 2025 |
| 27303 | South La. Production Co., Inc. | | Oil & Gas Operator | Jun 1982 |
| 27304 | South Leeville, LLC | Houston, TX 77069 | Oil & Gas Operator | Oct 2022 |
| 27305 | South Loop Operating, L.C. | San Antonio, TX 78279 | Oil & Gas Operator | Apr 2009 |
| 27306 | South Oak Production Company | | Oil & Gas Operator | Jun 2010 |
| 27307 | South Of Briles | | Oil Operator | Aug 1989 |
| 27308 | South Oil, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 27309 | South Pass Petroleum Inc | Casper, WY 82601 | Oil & Gas Operator | May 2025 |
| 27310 | South Ranch Corporation | Midland, TX 79707 | Oil Operator | Sep 2019 |
| 27311 | South Ranch Oil | | Gas Operator | Dec 1990 |
| 27312 | South Ranch Oil Company Inc | St. Louis, MO 63124 | Oil Operator | Sep 1996 |
| 27313 | South River Operating, LLC | | Oil & Gas Operator | Dec 2016 |
| 27314 | South Romeo Gas Storage Company LLC | | Gas Operator | Feb 1994 |
| 27315 | South Sam Operating Company, LLC | Lakehills, TX 78063 | Oil Operator | Jul 2025 |
| 27316 | South Sands Exploration LLC | Henryetta, OK 74437-4208 | Oil & Gas Operator | Apr 2025 |
| 27317 | South Shore Energy LLC | Geneva, OH 44041 | Oil & Gas Operator | Dec 2024 |
| 27318 | South Texas Drilling & Expl, Inc | San Antonio, TX 78217 | Oil & Gas Operator | Jan 1999 |
| 27319 | South Texas Energy Production | Devine, TX 78016 | Oil & Gas Operator | Dec 1996 |
| 27320 | South Texas Injection Company | Mineral, TX 78125 | Oil & Gas Operator | Dec 2016 |
| 27321 | South Texas Limited Partnership | Houston, TX 77060 | Oil & Gas Operator | Feb 1994 |
| 27322 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2025 |
| 27323 | South Texas SWD, Inc. | Beeville, TX 78104 | Oil & Gas Operator | Aug 2003 |
| 27324 | South West Texas Oil & Gas, Inc. | Luling, TX 78648 | Oil & Gas Operator | Feb 2000 |
| 27325 | Southampton Mineral Corp. | | Oil & Gas Operator | Aug 2005 |
| 27326 | Southbound Gas Company | Dallas, TX 75201 | Gas Operator | May 2025 |
| 27327 | Southbrook Energies Inc | Tulsa, OK 74153 | Oil Operator | Feb 2004 |
| 27328 | Southco Oil And Gas Inc. | | Oil & Gas Operator | Nov 2000 |
| 27329 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | Jul 2025 |
| 27330 | Southcoast Resources, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2015 |
| 27331 | Southcreek Petroleum Co LLC | Blanchard, OK 73010-4911 | Oil & Gas Operator | Oct 2024 |
| 27332 | Southcross Operating LLC | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2005 |
| 27333 | Southeastern Gas Company | | Oil & Gas Operator | Dec 2019 |
| 27334 | Southeastern Oil & Gas Corp | | Oil Operator | Dec 2023 |
| 27335 | Southeastern Petroleum Inc | Roswell, NM BAD ADDR | Oil & Gas Operator | Dec 1995 |
| 27336 | Southeastern Pipe Line Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2020 |
| 27337 | Southeastern Producing Co | | Oil Operator | Jul 1988 |
| 27338 | Southeastern Public Service Co | | Oil & Gas Operator | Sep 1982 |
| 27339 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 27340 | Southerland Jackie Dale Dba Skyden Oil | Duncan, OK 73533-5392 | Oil & Gas Operator | Apr 2025 |
| 27341 | Southerland Joe Don Dba Taylor Oil Co | Duncan, OK 73533 | Oil & Gas Operator | Apr 2025 |
| 27342 | Southerland Marquieta Dba Keta Oil Company | Loco, OK 73442 | Oil & Gas Operator | Apr 2025 |
| 27343 | Southerland, Glenn Oil & Gas Co. | Hallsville, TX 75650 | Oil & Gas Operator | Feb 2021 |
| 27344 | Southern Alliance Oil Corp. | Grapevine, TX 76099 | Oil & Gas Operator | Jul 2025 |
| 27345 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 27346 | Southern California Gas Company | | Oil & Gas Operator | Apr 2025 |
| 27347 | Southern Crude, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2017 |
| 27348 | Southern Energy Operating Co Inc | | Oil Operator | May 2025 |
| 27349 | Southern Energy Operating, LLC | | Oil & Gas Operator | Nov 2024 |
| 27350 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 27351 | Southern G Holdings, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 27352 | Southern Gas Inc | | Gas Operator | Jan 1987 |
| 27353 | Southern Hills Gas Co. | | Oil Operator | Oct 2024 |
| 27354 | Southern Hydrocarbons Inc | | Oil & Gas Operator | Jul 1989 |
| 27355 | Southern Int'L Inc | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2007 |
| 27356 | Southern Management Inc | Camargo, OK 73835 | Oil Operator | Jun 1992 |
| 27357 | Southern Management Services | | Oil Operator | May 2017 |
| 27358 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 27359 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 27360 | Southern Natural Gas Company LLC | | Oil & Gas Operator | Nov 2024 |
| 27361 | Southern Oil & Gas Company | | Oil & Gas Operator | Mar 2011 |
| 27362 | Southern Oil & Gas LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2025 |
| 27363 | Southern Oil Of Louisiana LLC | Madisonville, LA 70447 | Oil & Gas Operator | Jul 2025 |
| 27364 | Southern Oklahoma Production | Wilson, OK 73463-6537 | Oil Operator | May 2025 |
| 27365 | Southern Operating Corporation | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 27366 | Southern Operating, Inc. | | Oil Operator | Dec 2000 |
| 27367 | Southern Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Jul 2025 |
| 27368 | Southern Petroleum Company | | Oil & Gas Operator | Jan 1994 |
| 27369 | Southern Production & Expl Co. | | Oil & Gas Operator | Apr 2008 |
| 27370 | Southern Production Co | Madill, OK 73446 | Oil & Gas Operator | May 2025 |
| 27371 | Southern Production SVC., Inc. | | Oil Operator | Mar 1997 |
| 27372 | Southern Resource Company | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Mar 2022 |
| 27373 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | May 2025 |
| 27374 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 27375 | Southern Solutions And Services LLC | | Oil Operator | Dec 2014 |
| 27376 | Southern Star Central Gas Pipeline, Inc. | Owensboro, KY 42301 | Oil & Gas Operator | Apr 2025 |
| 27377 | Southern Star Operating LLC | Provo, UT 84604-7714 | Oil & Gas Operator | Jun 2017 |
| 27378 | Southern Star Operating, Inc. | | Oil & Gas Operator | Jun 2010 |
| 27379 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 27380 | Southern States Gas & Oil LTD | | Oil & Gas Operator | Jul 2004 |
| 27381 | Southern States Oil Production, LLC | | Oil & Gas Operator | Oct 2013 |
| 27382 | Southern States Petroleum Corp | | Oil Operator | Jan 1984 |
| 27383 | Southern Tejas Asset Group LLC | McAllen, TX 78501 | Oil & Gas Operator | Jul 2025 |
| 27384 | Southern Triangle Oil | | Oil & Gas Operator | Dec 2000 |
| 27385 | Southern Triangle Oil Co | MT Carmel, IL 62863 | Oil & Gas Operator | Dec 2023 |
| 27386 | Southern Union Exploration | | Oil Operator | Jan 1990 |
| 27387 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 27388 | Southern Union Production Co. | | Oil Operator | Apr 1979 |
| 27389 | Southern Water Disposal, LLC | | Oil & Gas Operator | Jan 2025 |
| 27390 | Southern Wells, Inc. | | Oil Operator | Sep 2002 |
| 27391 | Southern WV Oil & Gas | | Gas Operator | Dec 2021 |
| 27392 | Southfourk Partners LLC | Blanchard, OK 73010-7209 | Oil Operator | Apr 2025 |
| 27393 | Southlake Exploration, Inc. | Southlake, TX 76092 | Oil & Gas Operator | Jul 2025 |
| 27394 | Southlake Operating LLC | Weatherford, TX 76086 | Oil & Gas Operator | Jul 2025 |
| 27395 | Southland Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Aug 2022 |
| 27396 | Southland Royalt | | Oil & Gas Operator | Nov 1993 |
| 27397 | Southland Royalty Co.-Midland | Midland, TX 79702 | Oil & Gas Operator | Mar 1996 |
| 27398 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 27399 | Southland Royalty Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2021 |
| 27400 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |