| 801 | Enron Corporatio | | Oil & Gas Operator | Aug 1999 |
| 802 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 803 | Enserch Exploration | | Oil & Gas Operator | Oct 1996 |
| 804 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 805 | Enserch Oil & Gas, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 1998 |
| 806 | Ensight Energy Group Inc | Richardson, TX 75080-2370 | Oil & Gas Operator | Oct 2025 |
| 807 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 808 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 809 | Ensight IV Energy Management,LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 810 | Ensight Resources, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 811 | Ensign Oil & Gas Inc. | | Oil & Gas Operator | Jul 1993 |
| 812 | Ensign Operating | | Oil & Gas Operator | Oct 1994 |
| 813 | Ensign Operating Co. | Denver, CO 80202 | Oil & Gas Operator | Jan 2004 |
| 814 | Ensign Operating LLC | Houston, TX 77086 | Oil & Gas Operator | Feb 2023 |
| 815 | Ensminger D & J | | Oil Operator | Dec 1994 |
| 816 | Ensminger Energy LLC | Moran, KS 66755 | Oil Operator | Sep 2025 |
| 817 | Ensminger Oil, LLC | Moran, KS 66755 | Oil Operator | Sep 2025 |
| 818 | Ensminger, Donald & Jack, A General Partnership | Moran, KS 66755 | Oil Operator | Jun 2005 |
| 819 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |
| 820 | Enstar Corporation | Houston, TX 77252 | Oil & Gas Operator | Apr 1988 |
| 821 | Enstar Energy, Inc. | Arlington, TX 76003 | Oil & Gas Operator | Dec 2025 |
| 822 | Enstar Petroleum Company | | Oil & Gas Operator | Aug 1985 |
| 823 | Enstar Petroleum Inc | | Oil & Gas Operator | Apr 1985 |
| 824 | Enstor Katy Storage & Transp LP | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 825 | Ensz, Jerry | Sublette, KS 67877 | Gas Operator | Sep 2025 |
| 826 | Entek GRB LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 827 | Enterprise Energy Corp | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1985 |
| 828 | Enterprise Energy Exploration Inc | Tulsa, OK 74133-6724 | Oil & Gas Operator | Oct 2025 |
| 829 | Enterprise Energy Prod Co Inc | Tulsa, OK 74133-6754 | Oil & Gas Operator | Mar 2015 |
| 830 | Enterprise Exploration Inc | Tulsa, OK 74133 | Oil & Gas Operator | Nov 2020 |
| 831 | Enterprise Gathering LLC | | Oil Operator | Dec 2024 |
| 832 | Enterprise Inc | Hays, KS 67601 | Oil Operator | Sep 2015 |
| 833 | Enterprise Marke | | Oil & Gas Operator | Oct 1992 |
| 834 | Enterprise Oil Marketing Corp. | Little Rock, AR 72206 | Oil Operator | Sep 1998 |
| 835 | Enterprise Resources Inc. | | Oil & Gas Operator | Jun 1979 |
| 836 | Enterprising Enterprises Inc | Tulsa, OK 74137 | Oil Operator | Jun 2009 |
| 837 | Enterra Resources, LLC | Edmond, OK 73083 | Oil & Gas Operator | Sep 2025 |
| 838 | Entex Oil Company | | Gas Operator | Dec 1993 |
| 839 | Entex Petroleum Inc | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 1997 |
| 840 | Entex, Inc. | | Oil & Gas Operator | Dec 1984 |
| 841 | Entransco Energy LLC | Dewey, OK 74029 | Oil & Gas Operator | Oct 2024 |
| 842 | Enveron Corporation | Portage, MI 49024 | Oil & Gas Operator | Dec 2017 |
| 843 | Envirocorp Inc | Hamburg, NY 14075 | Oil & Gas Operator | Dec 1990 |
| 844 | Envirogas Inc | Hamburg, NY 14075 | Oil & Gas Operator | Dec 1992 |
| 845 | Environmental BR Ser Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 1987 |
| 846 | Environmental Exp Co | North Canton, OH 44720 | Oil & Gas Operator | Dec 1998 |
| 847 | Environmental Oil Co | Thornville, OH 43076 | Oil & Gas Operator | Dec 2024 |
| 848 | Environmental Soil Recovery LTD | | Oil Operator | Oct 2025 |
| 849 | Envirosearch Corporation | | Oil Operator | Dec 1992 |
| 850 | Envirotek Fuel Systems Inc | Dallas, TX 75243 | Oil & Gas Operator | May 2013 |
| 851 | Enwest Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Aug 1994 |
| 852 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 853 | EOG A Resources, Inc. | Artesia, NM 88210 | Oil & Gas Operator | Dec 2018 |
| 854 | EOG M Resources, Inc. | Artesia, NM 88211 | Oil & Gas Operator | Dec 2018 |
| 855 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 856 | EOG Y Resources Inc | Artesia, NM 88210 | Oil & Gas Operator | Feb 2019 |
| 857 | Eok Operating LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Nov 2025 |
| 858 | Eor LLC | | Oil & Gas Operator | Nov 2013 |
| 859 | Eor Operating Company | Houston, TX 77079 | Oil & Gas Operator | Dec 2025 |
| 860 | Eos Energy LLC | Columbus, OH 43026 | Oil & Gas Operator | Dec 2024 |
| 861 | Eott Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 862 | Eott Energy Operating LP | Houston, TX 77210-4666 | Oil & Gas Operator | Oct 2009 |
| 863 | EP Energy E&P Company, LLC | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 864 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 865 | EP Operating Co, A LTD Ptrship | | Oil & Gas Operator | Oct 1992 |
| 866 | EP Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Jan 1993 |
| 867 | EP Operating Company LP | Midland, TX 79705-5510 | Oil & Gas Operator | Mar 1993 |
| 868 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 869 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 870 | EP&W | | Oil Operator | Dec 1997 |
| 871 | Epic Energy, L.L.C. | Aztec, NM 87410 | Oil & Gas Operator | Nov 2025 |
| 872 | Epic Permian Operating, LLC | Arvada, CO 80006 | Oil & Gas Operator | Jan 2025 |
| 873 | Epl Oil & Gas, Inc | | Oil & Gas Operator | Aug 2015 |
| 874 | Epley Bobbie Inc | Wilson, OK 73463-6319 | Oil Operator | Jun 2007 |
| 875 | Epoc, LLC | Andover, KS 67002 | Oil Operator | Sep 2025 |
| 876 | Epoch Petroleum Corporation | | Oil & Gas Operator | Dec 1992 |
| 877 | Epoch Resources Of Texas Inc | Port Aransas, TX 78373-1637 | Oil & Gas Operator | Nov 2014 |
| 878 | Epperson Dwight | Okemah, OK 74859 | Oil Operator | Jan 2013 |
| 879 | Epperson John R | Bartlesville, OK 74003 | Oil Operator | Aug 1999 |
| 880 | Eps Resources Corp | Englewood, CO 80111 | Oil & Gas Operator | Dec 2009 |
| 881 | Epsilon Energy USA, Inc. | Houston, TX 77002 | Gas Operator | Dec 2012 |
| 882 | Epstein Jr Oper Co | | Oil & Gas Operator | Mar 1991 |
| 883 | Epstein, Edwin A Jr Oper Co Inc | Las Vegas, NV 89128 | Gas Operator | Dec 2001 |
| 884 | Eqt Aro LLC | Canonsburg, PA 15317-5851 | Gas Operator | Nov 2025 |
| 885 | Eqt Chap, LLC | Pittsburgh, PA 15222 | Oil & Gas Operator | Nov 2025 |
| 886 | Eqt Production Company | Pittsburg, PA 15222 | Oil & Gas Operator | Nov 2025 |
| 887 | Eqt Production Texas, LLC | Pittsburgh, PA 15222 | Oil & Gas Operator | Jun 2018 |
| 888 | Equal Energy Us Inc | Tulsa, OK 74103-4621 | Oil & Gas Operator | Nov 2019 |
| 889 | Equinor Energy LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2021 |
| 890 | Equinor USA Onshore Properties Inc. | Houston, TX 77042 | Oil & Gas Operator | Mar 2024 |
| 891 | Equinox Oil Comp | | Oil Operator | Dec 1996 |
| 892 | Equinox Oil Company Inc | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 893 | Equipment Lott Inc The | Hennessey, OK 73742-0655 | Oil & Gas Operator | Mar 2008 |
| 894 | Equipment, Inc. | | Oil & Gas Operator | Mar 1983 |
| 895 | Equitable Gas Company | Pittsburgh, PA 15212-5352 | Gas Operator | Dec 2013 |
| 896 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 897 | Equitable Prod Eastern States Exploration Inc | Snow Shoe, PA 16874-0178 | Gas Operator | Dec 2001 |
| 898 | Equitable Production Company | Charleston, WV 25302 | Oil & Gas Operator | Dec 2007 |
| 899 | Equitable Resources Energy | Houston, TX 77056-2742 | Oil & Gas Operator | Sep 1997 |
| 900 | Equitable Resources Energy Co, Western Region | Billings, MT 59102 | Oil & Gas Operator | May 1997 |