| 1801 | Southern Triangle Oil | | Oil & Gas Operator | Dec 2000 |
| 1802 | Southern Triangle Oil Co | MT Carmel, IL 62863 | Oil & Gas Operator | Dec 2024 |
| 1803 | Southern Union Exploration | | Oil Operator | Jan 1990 |
| 1804 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 1805 | Southern Union Production Co. | | Oil Operator | Apr 1979 |
| 1806 | Southern Water Disposal, LLC | | Oil & Gas Operator | Jan 2025 |
| 1807 | Southern Wells, Inc. | | Oil Operator | Sep 2002 |
| 1808 | Southfourk Partners LLC | Blanchard, OK 73010-7209 | Oil Operator | Jan 2026 |
| 1809 | Southlake Exploration, Inc. | Southlake, TX 76092 | Oil & Gas Operator | May 2026 |
| 1810 | Southlake Operating LLC | Weatherford, TX 76086 | Oil & Gas Operator | May 2026 |
| 1811 | Southland Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Aug 2022 |
| 1812 | Southland Royalt | | Oil & Gas Operator | Nov 1993 |
| 1813 | Southland Royalty Co.-Midland | Midland, TX 79702 | Oil & Gas Operator | Mar 1996 |
| 1814 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 1815 | Southland Royalty Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2021 |
| 1816 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 1817 | Southridge Homes | | Oil & Gas Operator | Dec 1999 |
| 1818 | Southridge Operating Company | San Marcos, TX 78667 | Oil & Gas Operator | May 2026 |
| 1819 | Southstar Energy Corporation | Ardmore, OK 73401 | Gas Operator | Aug 1990 |
| 1820 | Southstar Oil And Gas Inc | Andover, KS 67002-0123 | Oil & Gas Operator | Jul 2020 |
| 1821 | Southstone Energy, LLC | Austin, TX 78735 | Oil Operator | May 2026 |
| 1822 | Southwell Russell C | Warren, PA 16365-3686 | Oil & Gas Operator | Dec 2022 |
| 1823 | Southwell William R | Warren, PA 16365-1259 | Oil & Gas Operator | Dec 2017 |
| 1824 | Southwest Energy Devel.,Inc. | Sugar Land, TX 77478 | Oil & Gas Operator | Jul 2007 |
| 1825 | Southwest Energy Development Inc | Bison, OK 73720 | Oil & Gas Operator | Feb 2026 |
| 1826 | Southwest Energy LP | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 1827 | Southwest Exploration Company | Oklahoma City, OK 73132-2230 | Oil & Gas Operator | Jun 2017 |
| 1828 | Southwest Gas Producing Co Inc | | Oil & Gas Operator | Nov 1994 |
| 1829 | Southwest Gas St | | Oil & Gas Operator | Dec 1981 |
| 1830 | Southwest Gas Storage Company | | Gas Operator | Dec 2025 |
| 1831 | Southwest Gas Systems, Inc. | Spring, TX 77379 | Oil & Gas Operator | May 2026 |
| 1832 | Southwest Gathering Company | Alice, TX 78332 | Oil & Gas Operator | May 2026 |
| 1833 | Southwest General Dev., Inc. | | Oil & Gas Operator | Dec 2003 |
| 1834 | Southwest Land & Minerals, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Aug 2003 |
| 1835 | Southwest Loop 1604, LTD. | San Antonio, TX 78209 | Oil Operator | Sep 2022 |
| 1836 | Southwest Mississippi Oil & Gas LLC. | | Oil Operator | Feb 2026 |
| 1837 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 1838 | Southwest Oil Properties, Inc. | | Oil & Gas Operator | Feb 1996 |
| 1839 | Southwest Operating Company | Overland Park, KS 66212 | Oil & Gas Operator | Mar 2012 |
| 1840 | Southwest Operating Inc. | | Oil & Gas Operator | Dec 2024 |
| 1841 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | May 2026 |
| 1842 | Southwest Petroleum | San Antonio, TX 78253 | Oil & Gas Operator | May 2026 |
| 1843 | Southwest Petroleum Corp | Drumright, OK 74030 | Oil & Gas Operator | Mar 2018 |
| 1844 | Southwest Petroleum Oil & Gas Explor LLC | San Bernardino, CA 92404-1010 | Oil & Gas Operator | Jun 2022 |
| 1845 | Southwest Production Co | Richardson, TX BADADDR | Oil & Gas Operator | Apr 1997 |
| 1846 | Southwest Resources, Inc. | Brenham, TX 77834 | Oil & Gas Operator | May 2026 |
| 1847 | Southwest Rig Service | | Oil & Gas Operator | Nov 1998 |
| 1848 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2026 |
| 1849 | Southwest-Operating | Penwell, TX 79776 | Oil & Gas Operator | May 2026 |
| 1850 | Southwestern Electric Power Co | Dallas, TX 75266 | Oil & Gas Operator | Dec 1989 |
| 1851 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 1852 | Southwestern Exploration Consultants Inc | Oklahoma City, OK 73118-1116 | Oil & Gas Operator | Feb 2026 |
| 1853 | Southwestern Inc | Hobbs, NM 88240 | Oil Operator | Oct 2009 |
| 1854 | Southwestern Oil Corporation | Oklahoma City, OK 73106 | Oil & Gas Operator | Jan 2026 |
| 1855 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Feb 2026 |
| 1856 | Southwind Consulting | Pratt, KS 67124 | Oil Operator | Oct 1997 |
| 1857 | Southwind Exploration, LLC | Venice, FL 34293 | Oil & Gas Operator | Sep 2003 |
| 1858 | Southwind Oil & Gas LLC | | Oil & Gas Operator | Dec 2023 |
| 1859 | Southwind Petroleum Corp. | Wichita, KS 67203 | Oil & Gas Operator | Jun 2022 |
| 1860 | Sovereign Eagle, LLC | Roswell, NM 88202 | Oil & Gas Operator | Jul 2018 |
| 1861 | Sovereign Energy Corp. | | Oil Operator | Dec 2001 |
| 1862 | Sovereign Operating Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2016 |
| 1863 | Sovereign Petroleum Company, LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jul 2013 |
| 1864 | Sowers William & Sara | Blue Rock, OH 43720 | Oil Operator | Dec 2022 |
| 1865 | Sowle Exploratio | | Oil Operator | Aug 1986 |
| 1866 | Sowle Explorations | | Oil Operator | Dec 2002 |
| 1867 | Soxgi LLC | Andrews, TX 79714 | Gas Operator | Feb 2026 |
| 1868 | Sozo Natural Resources LLC | Houston, TX 77056 | Oil & Gas Operator | May 2026 |
| 1869 | SP Energy Development Company | Seattle, WA 98101-3277 | Oil & Gas Operator | Mar 2015 |
| 1870 | Space Production Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2026 |
| 1871 | Spacht, James W. & Shelly F | Ripley, NY 14775 | Gas Operator | Dec 2024 |
| 1872 | Spade Energy L.L.C. | Fort Worth, TX 76177 | Oil & Gas Operator | May 2026 |
| 1873 | Spain Oil Company | Somerset, TX 78069 | Oil & Gas Operator | May 2026 |
| 1874 | Spalding Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 2026 |
| 1875 | Spalsbury, Arthur L | Hays, KS 67601 | Oil Operator | Aug 2001 |
| 1876 | Spark'S Energy Inc | Perry, OK 73077 | Oil & Gas Operator | Nov 2014 |
| 1877 | Sparkman Rodger E | Jenks, OK 74037-0267 | Oil Operator | Sep 2018 |
| 1878 | Sparks Daniel M | Chickasha, OK 73023-1435 | Oil & Gas Operator | Apr 2014 |
| 1879 | Sparks Greg | Afton, OK 74331 | Oil & Gas Operator | Jan 2026 |
| 1880 | Sparks Harold | Radnor, OH 43066 | Oil & Gas Operator | Dec 1987 |
| 1881 | Sparks Mick Oil Company Inc | Jennings, OK 74038-0250 | Oil & Gas Operator | Jan 2026 |
| 1882 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 1883 | Sparks Resources Inc | Bristow, OK 74010 | Oil & Gas Operator | Feb 2026 |
| 1884 | Sparks, Pearlman E | Mazie, KY 41160 | Oil Operator | Dec 2015 |
| 1885 | Sparks, Sidney A., Trustee | Alice, TX 78332 | Oil & Gas Operator | Jun 1996 |
| 1886 | Sparlin J L | Oklahoma City, OK 73156-1446 | Oil Operator | Feb 2026 |
| 1887 | Sparrow Oil & Gas LLC | | Oil & Gas Operator | Mar 2026 |
| 1888 | Sparrow Operating LLC | Comanche, OK 73529-9747 | Oil Operator | Jan 2026 |
| 1889 | Sparta Energy Corp | Oak Brook, IL 60521 | Oil & Gas Operator | Dec 1985 |
| 1890 | Sparta Exploration LLC | Houston, TX 77279 | Oil & Gas Operator | May 2026 |
| 1891 | Spartagus Corporation | Grand Saline, TX 75140 | Oil & Gas Operator | Sep 2004 |
| 1892 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 1893 | Spartan Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2013 |
| 1894 | Spartan Petroleum Corporation | Houston, TX 77079 | Oil & Gas Operator | Oct 1987 |
| 1895 | Spartan Resource MGMT Corp | Rural Valley, PA 16249-0326 | Gas Operator | Dec 2025 |
| 1896 | Spartan Resources LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2026 |
| 1897 | Spartan Royalties, LLC | | Oil Operator | Dec 2024 |
| 1898 | SPC Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2024 |
| 1899 | Spear Production Company, Inc. | Shreveport, LA 71161 | Oil Operator | May 2026 |
| 1900 | Spearco Oil | Electra, TX 76360 | Oil & Gas Operator | Aug 2003 |