| 28301 | Southern California Gas Company | | Oil & Gas Operator | Dec 2025 |
| 28302 | Southern Canadian Resources, Inc | Abilene, TX 79604 | Oil & Gas Operator | Aug 1999 |
| 28303 | Southern Crude, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2017 |
| 28304 | Southern Energy Operating, LLC | | Oil & Gas Operator | Oct 2025 |
| 28305 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 28306 | Southern G Holdings, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 28307 | Southern Gas Inc | | Gas Operator | Jan 1987 |
| 28308 | Southern Hills Gas Co. | | Oil Operator | May 2025 |
| 28309 | Southern Hydrocarbons Inc | | Oil & Gas Operator | Jul 1989 |
| 28310 | Southern Int'L Inc | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2007 |
| 28311 | Southern Management Inc | Camargo, OK 73835 | Oil Operator | Jun 1992 |
| 28312 | Southern Management Services | | Oil Operator | May 2017 |
| 28313 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 28314 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 28315 | Southern Natural Gas Company LLC | | Oil & Gas Operator | Nov 2024 |
| 28316 | Southern Oil & Gas Company | | Oil & Gas Operator | Mar 2011 |
| 28317 | Southern Oil & Gas LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 28318 | Southern Oil Of Louisiana LLC | Madisonville, LA 70447 | Oil & Gas Operator | Feb 2026 |
| 28319 | Southern Oklahoma Production | Wilson, OK 73463-6537 | Oil & Gas Operator | Dec 2025 |
| 28320 | Southern Operating Corporation | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 28321 | Southern Operating, Inc. | | Oil Operator | Dec 2000 |
| 28322 | Southern Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 28323 | Southern Petroleum Company | | Oil & Gas Operator | Jan 1994 |
| 28324 | Southern Pipeline Field Ser | Fort Worth, TX 76161-2077 | Gas Operator | Feb 2015 |
| 28325 | Southern Production & Expl Co. | | Oil & Gas Operator | Apr 2008 |
| 28326 | Southern Production Co Inc | Madill, OK 73446 | Oil & Gas Operator | Nov 2025 |
| 28327 | Southern Production SVC., Inc. | | Oil Operator | Mar 1997 |
| 28328 | Southern Resource Company | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Mar 2022 |
| 28329 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Dec 2025 |
| 28330 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 28331 | Southern Solutions And Services LLC | | Oil Operator | Dec 2014 |
| 28332 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | Nov 2025 |
| 28333 | Southern Star Operating LLC | Provo, UT 84604-7714 | Oil & Gas Operator | Jun 2017 |
| 28334 | Southern Star Operating, Inc. | | Oil & Gas Operator | Jun 2010 |
| 28335 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 28336 | Southern States Gas & Oil LTD | | Oil & Gas Operator | Jul 2004 |
| 28337 | Southern States Oil Production, LLC | | Oil & Gas Operator | Oct 2013 |
| 28338 | Southern States Petroleum Corp | | Oil Operator | Jan 1984 |
| 28339 | Southern Tejas Asset Group LLC | McAllen, TX 78501 | Oil & Gas Operator | Feb 2026 |
| 28340 | Southern Triangle Oil | | Oil & Gas Operator | Dec 2000 |
| 28341 | Southern Triangle Oil Co | MT Carmel, IL 62863 | Oil & Gas Operator | Dec 2023 |
| 28342 | Southern Union Exploration | | Oil Operator | Jan 1990 |
| 28343 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 28344 | Southern Union Production Co. | | Oil Operator | Apr 1979 |
| 28345 | Southern Water Disposal, LLC | | Oil & Gas Operator | Jan 2025 |
| 28346 | Southern Wells, Inc. | | Oil Operator | Sep 2002 |
| 28347 | Southern WV Oil & Gas | | Gas Operator | Dec 2021 |
| 28348 | Southfourk Partners LLC | Blanchard, OK 73010-7209 | Oil Operator | Nov 2025 |
| 28349 | Southlake Exploration, Inc. | Southlake, TX 76092 | Oil & Gas Operator | Feb 2026 |
| 28350 | Southlake Operating LLC | Weatherford, TX 76086 | Oil & Gas Operator | Feb 2026 |
| 28351 | Southland Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Aug 2022 |
| 28352 | Southland Royalt | | Oil & Gas Operator | Nov 1993 |
| 28353 | Southland Royalty Co.-Midland | Midland, TX 79702 | Oil & Gas Operator | Mar 1996 |
| 28354 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 28355 | Southland Royalty Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2021 |
| 28356 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 28357 | Southridge Homes | | Oil & Gas Operator | Dec 1999 |
| 28358 | Southridge Operating Company | San Marcos, TX 78667 | Oil & Gas Operator | Feb 2026 |
| 28359 | Southstar Energy Corporation | Ardmore, OK 73401 | Gas Operator | Aug 1990 |
| 28360 | Southstar Oil And Gas Inc | Andover, KS 67002-0123 | Oil & Gas Operator | Jul 2020 |
| 28361 | Southstone Energy, LLC | Austin, TX 78735 | Oil Operator | Feb 2026 |
| 28362 | Southwell Russell C | Warren, PA 16365-3686 | Oil & Gas Operator | Dec 2022 |
| 28363 | Southwell William R | Warren, PA 16365-1259 | Oil & Gas Operator | Dec 2017 |
| 28364 | Southwest Energy Devel.,Inc. | Sugar Land, TX 77478 | Oil & Gas Operator | Jul 2007 |
| 28365 | Southwest Energy Development Inc | Bison, OK 73720 | Oil & Gas Operator | Nov 2025 |
| 28366 | Southwest Exploration Company | Oklahoma City, OK 73132-2230 | Oil & Gas Operator | Jun 2017 |
| 28367 | Southwest Gas Producing Co Inc | | Oil & Gas Operator | Nov 1994 |
| 28368 | Southwest Gas St | | Oil & Gas Operator | Dec 1981 |
| 28369 | Southwest Gas Storage Company | | Gas Operator | Sep 2025 |
| 28370 | Southwest Gas Systems, Inc. | Spring, TX 77379 | Oil & Gas Operator | Feb 2026 |
| 28371 | Southwest Gathering Company | Alice, TX 78332 | Oil & Gas Operator | Feb 2026 |
| 28372 | Southwest General Dev., Inc. | | Oil & Gas Operator | Dec 2003 |
| 28373 | Southwest Ind Investment Co | | Gas Operator | Oct 1983 |
| 28374 | Southwest Investment Fund, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Aug 2003 |
| 28375 | Southwest Land & Minerals, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Aug 2003 |
| 28376 | Southwest Loop 1604, LTD. | San Antonio, TX 78209 | Oil Operator | Sep 2022 |
| 28377 | Southwest Mississippi Oil & Gas, LLC. | | Oil Operator | Dec 2025 |
| 28378 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 28379 | Southwest Oil Properties, Inc. | | Oil & Gas Operator | Feb 1996 |
| 28380 | Southwest Operating Company | Overland Park, KS 66212 | Oil & Gas Operator | Mar 2012 |
| 28381 | Southwest Operating Inc. | | Oil & Gas Operator | Dec 2024 |
| 28382 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | Feb 2026 |
| 28383 | Southwest Petroleum | San Antonio, TX 78253 | Oil & Gas Operator | Feb 2026 |
| 28384 | Southwest Petroleum Corp | Drumright, OK 74030 | Oil & Gas Operator | Mar 2018 |
| 28385 | Southwest Petroleum Oil & Gas Explor LLC | San Bernardino, CA 92404-1010 | Oil & Gas Operator | Jun 2022 |
| 28386 | Southwest Production Co | Richardson, TX BADADDR | Oil & Gas Operator | Apr 1997 |
| 28387 | Southwest Resources, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Feb 2026 |
| 28388 | Southwest Rig Service | | Oil & Gas Operator | Nov 1998 |
| 28389 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 28390 | Southwest-Operating | Penwell, TX 79776 | Oil & Gas Operator | Feb 2026 |
| 28391 | Southwestern Electric Power Co | Dallas, TX 75266 | Oil & Gas Operator | Dec 1989 |
| 28392 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 28393 | Southwestern Exploration Consultants Inc | Oklahoma City, OK 73118-1116 | Oil & Gas Operator | Nov 2025 |
| 28394 | Southwestern Inc | Hobbs, NM 88240 | Oil Operator | Oct 2009 |
| 28395 | Southwestern Oil Corporation | Oklahoma City, OK 73106 | Oil & Gas Operator | Dec 2025 |
| 28396 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Dec 2025 |
| 28397 | Southwind Consulting | Pratt, KS 67124 | Oil Operator | Oct 1997 |
| 28398 | Southwind Exploration, LLC | Venice, FL 34293 | Oil & Gas Operator | Sep 2003 |
| 28399 | Southwind Oil & Gas LLC | | Oil & Gas Operator | Dec 2023 |
| 28400 | Southwind Petroleum Corp. | Wichita, KS 67203 | Oil & Gas Operator | Jun 2022 |