| 1901 | Ebony Oil Inc | | Gas Operator | Oct 1990 |
| 1902 | Eby Frank V Corporation | Yukon, OK 73085-0860 | Oil Operator | Sep 2016 |
| 1903 | Ecc Energy Corporation | Dewey, OK 74029 | Oil & Gas Operator | Feb 2020 |
| 1904 | Echo E & P LLC | Oklahoma City, OK 73102-6439 | Oil & Gas Operator | Jan 2025 |
| 1905 | Echo Hawk Energy LLC | Tulsa, OK 74103 | Gas Operator | Dec 2010 |
| 1906 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 1907 | Eclipse Production Company | Bartlesville, OK 74003 | Oil Operator | Nov 2005 |
| 1908 | Eddie'S Submersible Service Inc | Shawnee, OK 74801-5047 | Oil & Gas Operator | Mar 2015 |
| 1909 | Eddings Steve L | Osage, OK 74054 | Oil & Gas Operator | Jul 2022 |
| 1910 | Edge Oil Company Inc | Cleveland, OK 74020-0284 | Oil & Gas Operator | Feb 2024 |
| 1911 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 1912 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 1913 | Edisto Resources Corp | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 1914 | Edmond Energy, LLC | Edmond, OK 73013 | Oil Operator | Jan 2025 |
| 1915 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 1916 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 1917 | Edwards Johnny E | Drumright, OK 74030 | Oil Operator | Apr 2011 |
| 1918 | Edwards Jr L A | Duncan, OK 73534-1348 | Oil & Gas Operator | Sep 1992 |
| 1919 | Edwards Oil & Gas Company | Oklahoma City, OK 73156-0386 | Oil & Gas Operator | Mar 2015 |
| 1920 | Edwards Production Inc | Healdton, OK 73438-6221 | Oil & Gas Operator | Mar 2015 |
| 1921 | Edwards Roy & Co Inc | Edmond, OK 73013-1354 | Oil & Gas Operator | Feb 2012 |
| 1922 | Edwards Timothy D | Broken Arrow, OK 74014-4052 | Oil & Gas Operator | Apr 2015 |
| 1923 | Eec Inc | Norman, OK 73069-6344 | Oil & Gas Operator | Feb 2025 |
| 1924 | Eei Operating Inc. | Plano, TX 75093 | Oil & Gas Operator | May 2015 |
| 1925 | Egan Resources Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2016 |
| 1926 | Egolf Operating Company | Oklahoma City, OK 73114-7899 | Oil & Gas Operator | Apr 1998 |
| 1927 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | Jan 2025 |
| 1928 | Ehrlich, Mitchell | Perryton, TX 79070 | Oil & Gas Operator | May 1999 |
| 1929 | Ehvi Exploration LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 1930 | Eichenber A H Co | Tulsa, OK 74105 | Oil & Gas Operator | Oct 2002 |
| 1931 | Eig Petroleum LLC | Asheville, NC 28803-2908 | Oil Operator | Aug 2015 |
| 1932 | Eight Round Corporation | Seminole, OK 74818-1482 | Oil & Gas Operator | Jul 2012 |
| 1933 | Ekg Operating Inc | Seminole, OK 74818-1028 | Oil & Gas Operator | Nov 2015 |
| 1934 | El Coqui' Oil Company | Tussy, OK 73088 | Oil & Gas Operator | Oct 2009 |
| 1935 | El Pache Energy Inc | Duncan, OK 73533 | Oil & Gas Operator | Aug 2017 |
| 1936 | El Paso Natural Gas Company | El Paso, TX 79978 | Oil & Gas Operator | Apr 2013 |
| 1937 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 1938 | El Santo Petroleum Corporation | | Oil & Gas Operator | Feb 1993 |
| 1939 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Feb 2025 |
| 1940 | Elco Resources LLC | Owasso, OK 74055-7575 | Oil & Gas Operator | Feb 2025 |
| 1941 | Elder & Vaughn Inc | Oklahoma City, OK 73154-0938 | Oil & Gas Operator | Mar 2008 |
| 1942 | Eleven K Oil & Gas LLC | Cushing, OK 74023 | Oil Operator | Feb 2025 |
| 1943 | Elf Aquitaine Inc | Houston, TX 77002 | Oil & Gas Operator | May 1991 |
| 1944 | Elgin Construction Company Inc | Elgin, OK 73538-0370 | Oil Operator | Oct 2024 |
| 1945 | Elint Operating Inc | Oklahoma City, OK 73106 | Oil & Gas Operator | May 1995 |
| 1946 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Feb 2025 |
| 1947 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Feb 2025 |
| 1948 | Elk Oil Company | Overland Park, KS 66212 | Oil & Gas Operator | Sep 2007 |
| 1949 | Elkhorn Exploration Co | Willis, TX 77378-8827 | Oil & Gas Operator | Jan 2025 |
| 1950 | Ellard I W | Bixby, OK 74008-0220 | Oil & Gas Operator | Jan 2007 |
| 1951 | Elliott Resources Inc | Ada, OK 74820-9227 | Oil & Gas Operator | Jul 2010 |
| 1952 | Ellis Resources Group Inc | Rhinelander, WI 54501 | Oil Operator | Dec 2024 |
| 1953 | Ellis Rolland | Henryetta, OK 74437-0536 | Oil & Gas Operator | Sep 2018 |
| 1954 | Ellithorp Production LLC | Lindsay, OK 73052-5013 | Oil & Gas Operator | Apr 2019 |
| 1955 | Ells Jr Harry A | Englewood, CO 80150 | Gas Operator | Feb 2017 |
| 1956 | Elm Fork Gas Pipeline Inc | Shamrock, TX 79079-0606 | Gas Operator | Jan 2000 |
| 1957 | Elm Ridge Exploration Company LLC | Bloomfield, NM 87413 | Oil & Gas Operator | Nov 2017 |
| 1958 | Elmore Stanley G | Bartlesville, OK 74006-1741 | Oil & Gas Operator | Sep 2023 |
| 1959 | Elmtree Oil Co Inc | Bartlesville, OK 74006-1819 | Oil Operator | May 2021 |
| 1960 | Elson Oil Company | Tulsa, OK 74103-4429 | Oil & Gas Operator | Dec 2016 |
| 1961 | Elvera Stiles Trust | Broken Arrow, OK 74011 | Oil & Gas Operator | Jun 2024 |
| 1962 | Emc Exploration Company Inc | Oklahoma City, OK 73103-3775 | Oil & Gas Operator | Jul 2007 |
| 1963 | Emde & McNeil | Carney, OK 74832 | Oil & Gas Operator | Nov 1998 |
| 1964 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | Feb 2025 |
| 1965 | Emerson Oil Company | Rindge, NH 03461 | Oil & Gas Operator | Feb 2008 |
| 1966 | Emery Billie E | Skiatook, OK 74070 | Oil Operator | Dec 2024 |
| 1967 | Emery Edward A | Tulsa, OK 74145-7921 | Oil Operator | Jan 2025 |
| 1968 | Emjo Operations Inc | Marlow, OK 73055-8803 | Oil & Gas Operator | Feb 2025 |
| 1969 | Emo Inc | Eufaula, OK 74432-0841 | Oil & Gas Operator | Apr 2020 |
| 1970 | Empire Land Corporation | New Orleans, LA 70130 | Oil & Gas Operator | Nov 2014 |
| 1971 | Empire Petroleum Company | Houston, TX 77044 | Oil Operator | Mar 2011 |
| 1972 | Empire Petroleum LLC | Salt Lake City, UT 84121-7021 | Oil & Gas Operator | Jun 2019 |
| 1973 | Enable Gas Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 1974 | Enable Oklahoma Intrastate Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2022 |
| 1975 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Feb 2024 |
| 1976 | Encino Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 1977 | Encore Operating Inc | Edmond, OK 73013-5417 | Oil Operator | Jan 2025 |
| 1978 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Feb 2025 |
| 1979 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 1980 | Endeavor Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 1981 | Endevco Eureka LLC | Oklahoma City, OK 73102-9211 | Oil & Gas Operator | Apr 2014 |
| 1982 | Endicott Melvin F | Ponca City, OK 74601 | Oil & Gas Operator | Apr 2001 |
| 1983 | Enerco Energy Corporation | Norman, OK 73069-6643 | Oil & Gas Operator | Apr 2020 |
| 1984 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |
| 1985 | Energas Corporation | Oklahoma City, OK 73105 | Oil & Gas Operator | Feb 2025 |
| 1986 | Energex Corp | Springfield, MO 65807 | Oil & Gas Operator | Jan 2025 |
| 1987 | Energex Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2025 |
| 1988 | Energon Oil, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Apr 2025 |
| 1989 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 1990 | Energy Environment Inc | Holdenville, OK 74848-0765 | Oil & Gas Operator | Jul 2016 |
| 1991 | Energy Exchange Corporation | Oklahoma City, OK 73112 | Oil Operator | Jan 2025 |
| 1992 | Energy Group Of America, Inc. | Hollister, MO 65672 | Oil Operator | Apr 2025 |
| 1993 | Energy Lease Service Inc | Drumright, OK 74030-7403 | Oil & Gas Operator | Jan 2025 |
| 1994 | Energy Operating Corporation | Plano, TX 75093-4409 | Oil & Gas Operator | Sep 2013 |
| 1995 | Energy Operations Oklahoma LP | Houston, TX 77002-6785 | Oil & Gas Operator | Nov 2010 |
| 1996 | Energy Production Services LLC | Oklahoma City, OK 73162-4736 | Oil & Gas Operator | Apr 2020 |
| 1997 | Energy Resources Dev Inc | Bixby, OK 74008-3658 | Oil & Gas Operator | Jan 2025 |
| 1998 | Energy Support Services LLC | Cheyenne, WY 82001 | Oil & Gas Operator | Jan 2025 |
| 1999 | Energy Three, Inc. | Jackson, MS 39211 | Oil & Gas Operator | Jan 2025 |
| 2000 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Jan 2025 |