| 1801 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | May 2026 |
| 1802 | Earnest Russel | Okmulgee, OK 74447-1216 | Oil & Gas Operator | Jan 2007 |
| 1803 | Earth Oil Inc | Skiatook, OK 74070-0578 | Oil & Gas Operator | Oct 2008 |
| 1804 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2026 |
| 1805 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 1806 | East Fitts Project LTD PTNSHP | Ada, OK 74820 | Oil & Gas Operator | Dec 2002 |
| 1807 | Eastbrook Of Fairview Inc | Fairview, OK 73737-0148 | Oil Operator | Aug 2013 |
| 1808 | Eastern Energy Dev Corporation | Oxford, CT 06478-1009 | Oil & Gas Operator | Apr 2020 |
| 1809 | Eastern Oilwell Cement Co Inc | Seminole, OK 74818-1704 | Oil & Gas Operator | Aug 2008 |
| 1810 | Eastern Operating Company LLC | Gans, OK 74936-5008 | Gas Operator | May 2026 |
| 1811 | Eastern Petroleum Company | Girard, OH 44420 | Oil & Gas Operator | Sep 1995 |
| 1812 | Easterwood D E | Duncan, OK 73533-1013 | Oil & Gas Operator | Jun 2001 |
| 1813 | Eastex Energy LLC | Shawnee, OK 74804 | Oil Operator | May 2026 |
| 1814 | Eastok Energy Partners LLC | Edmond, OK 73013-1044 | Oil & Gas Operator | May 2026 |
| 1815 | Eastok Pipeline LLC | Midland, TX 79710 | Gas Operator | May 2019 |
| 1816 | Eberle C Fred | Blackwell, OK 74631 | Oil Operator | Jun 1993 |
| 1817 | Eberly & Meade | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2002 |
| 1818 | Eby Frank V Corporation | Yukon, OK 73085-0860 | Oil Operator | Sep 2016 |
| 1819 | Ecc Energy Corporation | Dewey, OK 74029 | Oil & Gas Operator | Feb 2020 |
| 1820 | Echo E & P LLC | Oklahoma City, OK 73102-6439 | Oil & Gas Operator | May 2026 |
| 1821 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 1822 | Eckard Operating, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2026 |
| 1823 | Eclipse Production Co | | Oil Operator | Nov 2005 |
| 1824 | Eddie'S Submersible Service Inc | Shawnee, OK 74801-5047 | Oil & Gas Operator | Mar 2015 |
| 1825 | Eddings, Steve L | | Oil & Gas Operator | Jul 2022 |
| 1826 | Edge Oil Company Inc | Cleveland, OK 74020-0284 | Oil & Gas Operator | Feb 2026 |
| 1827 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2026 |
| 1828 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 1829 | Edisto Resources Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 1830 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 1831 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 1832 | Edwards Johnny E | Drumright, OK 74030 | Oil Operator | Apr 2011 |
| 1833 | Edwards Jr L A | Duncan, OK 73534-1348 | Oil & Gas Operator | Sep 1992 |
| 1834 | Edwards Oil & Gas Company | Oklahoma City, OK 73156-0386 | Oil & Gas Operator | Mar 2015 |
| 1835 | Edwards Production Inc | Healdton, OK 73438-6221 | Oil & Gas Operator | Mar 2015 |
| 1836 | Edwards Roy & Co Inc | Edmond, OK 73013-1354 | Oil & Gas Operator | Feb 2012 |
| 1837 | Edwards Timothy D | Broken Arrow, OK 74014-4052 | Oil & Gas Operator | Apr 2015 |
| 1838 | Eec Inc | Norman, OK 73072 | Oil & Gas Operator | Jun 2026 |
| 1839 | Eei Operating Inc. | Plano, TX 75093 | Oil & Gas Operator | May 2015 |
| 1840 | Egan Resources Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2016 |
| 1841 | Egolf Operating Company | Oklahoma City, OK 73114-7899 | Oil & Gas Operator | Apr 1998 |
| 1842 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | May 2026 |
| 1843 | Ehrlich, Mitchell | Perryton, TX 79070 | Oil & Gas Operator | May 1999 |
| 1844 | Ehvi Exploration LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 1845 | Eichenber A H Co | Tulsa, OK 74105 | Oil & Gas Operator | Oct 2002 |
| 1846 | Eig Petroleum LLC | Asheville, NC 28803-2908 | Oil Operator | Aug 2015 |
| 1847 | Eiger Operating Company, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2026 |
| 1848 | Ekg Operating Inc | Seminole, OK 74818-1028 | Oil & Gas Operator | Nov 2015 |
| 1849 | El Coqui' Oil Company | Tussy, OK 73088 | Oil & Gas Operator | Oct 2009 |
| 1850 | El Pache Energy Inc | Duncan, OK 73533 | Oil & Gas Operator | Aug 2017 |
| 1851 | El Paso Natural Gas Company | El Paso, TX 79978 | Oil & Gas Operator | Apr 2013 |
| 1852 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 1853 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jun 2026 |
| 1854 | Elco Resources LLC | Owasso, OK 74055-7575 | Oil & Gas Operator | Dec 2025 |
| 1855 | Elder & Vaughn Inc | Oklahoma City, OK 73154-0938 | Oil & Gas Operator | Mar 2008 |
| 1856 | Elendil Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Sep 2026 |
| 1857 | Eleven K Oil & Gas LLC | Cushing, OK 74023 | Oil Operator | Jun 2026 |
| 1858 | Elf Aquitaine Inc | Houston, TX 77002 | Oil & Gas Operator | May 1991 |
| 1859 | Elgin Construction Company Inc | Elgin, OK 73538-0370 | Oil Operator | Feb 2026 |
| 1860 | Elint Operating Inc | Oklahoma City, OK 73106 | Oil & Gas Operator | May 1995 |
| 1861 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2026 |
| 1862 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Dec 2025 |
| 1863 | Elk Oil Company | Overland Park, KS 66212 | Oil & Gas Operator | Sep 2007 |
| 1864 | Ellard I W | Bixby, OK 74008-0220 | Oil & Gas Operator | Jan 2007 |
| 1865 | Elliott Resources Inc | Ada, OK 74820-9227 | Oil & Gas Operator | Jul 2010 |
| 1866 | Ellis Resources Group Inc | Rhinelander, WI 54501 | Oil Operator | May 2026 |
| 1867 | Ellis Rolland | Henryetta, OK 74437-0536 | Oil & Gas Operator | Sep 2018 |
| 1868 | Ellithorp Production LLC | Lindsay, OK 73052-5013 | Oil & Gas Operator | Apr 2019 |
| 1869 | Ells Jr Harry A | Englewood, CO 80150 | Gas Operator | Feb 2017 |
| 1870 | Elm Ridge Exploration Company LLC | Bloomfield, NM 87413 | Oil & Gas Operator | Nov 2017 |
| 1871 | Elmore Stanley G | Bartlesville, OK 74006-1741 | Oil & Gas Operator | Sep 2023 |
| 1872 | Elmtree Oil Co Inc | Bartlesville, OK 74006-1819 | Oil Operator | May 2021 |
| 1873 | Elson Oil Company | Tulsa, OK 74103-4429 | Oil & Gas Operator | Dec 2016 |
| 1874 | Elvera Stiles Trust | Broken Arrow, OK 74011 | Oil & Gas Operator | Feb 2026 |
| 1875 | Emc Exploration Company Inc | Oklahoma City, OK 73103-3775 | Oil & Gas Operator | Jul 2007 |
| 1876 | Emde & McNeil | Carney, OK 74832 | Oil & Gas Operator | Nov 1998 |
| 1877 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | Jun 2026 |
| 1878 | Emerson Oil Company | Rindge, NH 03461 | Oil & Gas Operator | Feb 2008 |
| 1879 | Emery Billie E | Skiatook, OK 74070 | Oil Operator | May 2026 |
| 1880 | Emery Edward A | Tulsa, OK 74145-7921 | Oil Operator | May 2026 |
| 1881 | Emjo Operations Inc | Marlow, OK 73055-8803 | Oil & Gas Operator | May 2026 |
| 1882 | Emo Inc | Eufaula, OK 74432-0841 | Oil & Gas Operator | Apr 2020 |
| 1883 | Empire Land Corporation | New Orleans, LA 70130 | Oil & Gas Operator | Nov 2014 |
| 1884 | Empire Operating LLC | Lawton, OK 73501 | Oil Operator | May 2026 |
| 1885 | Empire Petroleum Company | Houston, TX 77044 | Oil Operator | Mar 2011 |
| 1886 | Empire Petroleum LLC | Cottonwood Heights, UT 84121 | Oil & Gas Operator | Jun 2019 |
| 1887 | Enable Gas Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 1888 | Enable Oklahoma Intrastate Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2022 |
| 1889 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | May 2026 |
| 1890 | Encino Operating, LLC | Houston, TX 77008 | Oil & Gas Operator | Sep 2026 |
| 1891 | Encore Operating Inc | Edmond, OK 73013-5417 | Oil Operator | May 2026 |
| 1892 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Jun 2026 |
| 1893 | Endeavor Drilling, Inc. | Wagoner, OK 74467 | Oil Operator | May 2026 |
| 1894 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 1895 | Endeavor Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 1896 | Endevco Eureka LLC | Oklahoma City, OK 73102-9211 | Oil & Gas Operator | Apr 2014 |
| 1897 | Endicott Melvin F | Ponca City, OK 74601 | Oil & Gas Operator | Apr 2001 |
| 1898 | Enerco Energy Corporation | Norman, OK 73069-6643 | Oil & Gas Operator | Apr 2020 |
| 1899 | Enerfin Gathering-East LLC | Houston, TX 77077 | Oil & Gas Operator | Nov 2022 |
| 1900 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |