| 1801 | South Oak Production Company | | Oil & Gas Operator | Jun 2010 |
| 1802 | South Of Briles | | Oil Operator | Aug 1989 |
| 1803 | South Oil, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 1804 | South Pass Petroleum Inc | Casper, WY 82601 | Oil & Gas Operator | Nov 2025 |
| 1805 | South Ranch Corporation | Midland, TX 79707 | Oil Operator | Sep 2019 |
| 1806 | South Ranch Oil | | Gas Operator | Dec 1990 |
| 1807 | South Ranch Oil Company Inc | St. Louis, MO 63124 | Oil Operator | Sep 1996 |
| 1808 | South River Operating, LLC | | Oil & Gas Operator | Dec 2016 |
| 1809 | South Romeo Gas Storage Company LLC | | Gas Operator | Feb 1994 |
| 1810 | South Sam Operating Company, LLC | Lakehills, TX 78063 | Oil Operator | Feb 2026 |
| 1811 | South Sands Exploration LLC | Henryetta, OK 74437-4208 | Oil & Gas Operator | Nov 2025 |
| 1812 | South Shore Energy LLC | Geneva, OH 44041 | Oil & Gas Operator | Dec 2024 |
| 1813 | South Texas Drilling & Expl, Inc | San Antonio, TX 78217 | Oil & Gas Operator | Jan 1999 |
| 1814 | South Texas Energy Production | Devine, TX 78016 | Oil & Gas Operator | Dec 1996 |
| 1815 | South Texas Injection Company | Mineral, TX 78125 | Oil & Gas Operator | Dec 2016 |
| 1816 | South Texas Limited Partnership | Houston, TX 77060 | Oil & Gas Operator | Feb 1994 |
| 1817 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 1818 | South Texas SWD, Inc. | Beeville, TX 78104 | Oil & Gas Operator | Aug 2003 |
| 1819 | South West Texas Oil & Gas, Inc. | Luling, TX 78648 | Oil & Gas Operator | Feb 2000 |
| 1820 | Southampton Mineral Corp. | | Oil & Gas Operator | Aug 2005 |
| 1821 | Southbound Gas Company | Dallas, TX 75201 | Gas Operator | Dec 2025 |
| 1822 | Southbrook Energies Inc | Tulsa, OK 74153 | Oil Operator | Feb 2004 |
| 1823 | Southco Oil And Gas Inc. | | Oil & Gas Operator | Nov 2000 |
| 1824 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | Feb 2026 |
| 1825 | Southcoast Resources, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Dec 2015 |
| 1826 | Southcreek Petroleum Co LLC | Blanchard, OK 73010-4911 | Oil & Gas Operator | Oct 2025 |
| 1827 | Southcross Operating LLC | Amarillo, TX 79114 | Oil & Gas Operator | Oct 2005 |
| 1828 | Southeast Exploration Corp | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 1991 |
| 1829 | Southeastern Energy, Inc | Edmonton, KY 42129 | Gas Operator | Dec 2022 |
| 1830 | Southeastern Gas Company | | Oil & Gas Operator | Dec 2019 |
| 1831 | Southeastern Oil & Gas Corp | | Oil Operator | Dec 2023 |
| 1832 | Southeastern Petroleum Inc | Roswell, NM BAD ADDR | Oil & Gas Operator | Dec 1995 |
| 1833 | Southeastern Pipe Line Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2020 |
| 1834 | Southeastern Producing Co | | Oil Operator | Jul 1988 |
| 1835 | Southeastern Public Service Co | | Oil & Gas Operator | Sep 1982 |
| 1836 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 1837 | Southerland Jackie Dale Dba Skyden Oil | Duncan, OK 73533-5392 | Oil & Gas Operator | Dec 2025 |
| 1838 | Southerland Joe Don Dba Taylor Oil Co | Duncan, OK 73533 | Oil & Gas Operator | Nov 2025 |
| 1839 | Southerland Marquieta Dba Keta Oil Company | Loco, OK 73442 | Oil & Gas Operator | Nov 2025 |
| 1840 | Southerland, Glenn Oil & Gas Co. | Hallsville, TX 75650 | Oil & Gas Operator | Feb 2021 |
| 1841 | Southern Alliance Oil Corp. | Grapevine, TX 76099 | Oil & Gas Operator | Feb 2026 |
| 1842 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 1843 | Southern California Gas Company | | Oil & Gas Operator | Dec 2025 |
| 1844 | Southern Canadian Resources, Inc | Abilene, TX 79604 | Oil & Gas Operator | Aug 1999 |
| 1845 | Southern Crude, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2017 |
| 1846 | Southern Energy Operating Co Inc | | Oil Operator | Oct 2025 |
| 1847 | Southern Energy Operating, LLC | | Oil & Gas Operator | Oct 2025 |
| 1848 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 1849 | Southern G Holdings, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 1850 | Southern Gas Inc | | Gas Operator | Jan 1987 |
| 1851 | Southern Hills Gas Co. | | Oil Operator | May 2025 |
| 1852 | Southern Hydrocarbons Inc | | Oil & Gas Operator | Jul 1989 |
| 1853 | Southern Int'L Inc | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2007 |
| 1854 | Southern Management Inc | Camargo, OK 73835 | Oil Operator | Jun 1992 |
| 1855 | Southern Management Services | | Oil Operator | May 2017 |
| 1856 | Southern Mineral Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2001 |
| 1857 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 1858 | Southern Natural Gas Company LLC | | Oil & Gas Operator | Nov 2024 |
| 1859 | Southern Oil & Gas Company | | Oil & Gas Operator | Mar 2011 |
| 1860 | Southern Oil & Gas LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 1861 | Southern Oil Of Louisiana LLC | Madisonville, LA 70447 | Oil & Gas Operator | Feb 2026 |
| 1862 | Southern Oklahoma Production | Wilson, OK 73463-6537 | Oil & Gas Operator | Dec 2025 |
| 1863 | Southern Operating Corporation | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 1864 | Southern Operating, Inc. | | Oil Operator | Dec 2000 |
| 1865 | Southern Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 1866 | Southern Petroleum Company | | Oil & Gas Operator | Jan 1994 |
| 1867 | Southern Pipeline Field Ser | Fort Worth, TX 76161-2077 | Gas Operator | Feb 2015 |
| 1868 | Southern Production & Expl Co. | | Oil & Gas Operator | Apr 2008 |
| 1869 | Southern Production Co Inc | Madill, OK 73446 | Oil & Gas Operator | Nov 2025 |
| 1870 | Southern Production SVC., Inc. | | Oil Operator | Mar 1997 |
| 1871 | Southern Resource Company | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Mar 2022 |
| 1872 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Dec 2025 |
| 1873 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 1874 | Southern Solutions And Services LLC | | Oil Operator | Dec 2014 |
| 1875 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | Nov 2025 |
| 1876 | Southern Star Operating LLC | Provo, UT 84604-7714 | Oil & Gas Operator | Jun 2017 |
| 1877 | Southern Star Operating, Inc. | | Oil & Gas Operator | Jun 2010 |
| 1878 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 1879 | Southern States Gas & Oil LTD | | Oil & Gas Operator | Jul 2004 |
| 1880 | Southern States Oil Production, LLC | | Oil & Gas Operator | Oct 2013 |
| 1881 | Southern States Petroleum Corp | | Oil Operator | Jan 1984 |
| 1882 | Southern Tejas Asset Group LLC | McAllen, TX 78501 | Oil & Gas Operator | Feb 2026 |
| 1883 | Southern Triangle Oil | | Oil & Gas Operator | Dec 2000 |
| 1884 | Southern Triangle Oil Co | MT Carmel, IL 62863 | Oil & Gas Operator | Dec 2023 |
| 1885 | Southern Union Exploration | | Oil Operator | Jan 1990 |
| 1886 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 1887 | Southern Union Production Co. | | Oil Operator | Apr 1979 |
| 1888 | Southern Water Disposal, LLC | | Oil & Gas Operator | Jan 2025 |
| 1889 | Southern Wells, Inc. | | Oil Operator | Sep 2002 |
| 1890 | Southern WV Oil & Gas | | Gas Operator | Dec 2021 |
| 1891 | Southfourk Partners LLC | Blanchard, OK 73010-7209 | Oil Operator | Nov 2025 |
| 1892 | Southlake Exploration, Inc. | Southlake, TX 76092 | Oil & Gas Operator | Feb 2026 |
| 1893 | Southlake Operating LLC | Weatherford, TX 76086 | Oil & Gas Operator | Feb 2026 |
| 1894 | Southland Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Aug 2022 |
| 1895 | Southland Royalt | | Oil & Gas Operator | Nov 1993 |
| 1896 | Southland Royalty Co.-Midland | Midland, TX 79702 | Oil & Gas Operator | Mar 1996 |
| 1897 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 1898 | Southland Royalty Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2021 |
| 1899 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 1900 | Southridge Homes | | Oil & Gas Operator | Dec 1999 |