| 701 | Energy Search Operating Company | | Oil Operator | Dec 2009 |
| 702 | Energy Self-Service Oils, Inc. | | Oil & Gas Operator | Apr 2009 |
| 703 | Energy Service Investment Corp. | Tulsa, OK 74137 | Oil & Gas Operator | May 2006 |
| 704 | Energy Source, Inc.-Emerald | | Oil & Gas Operator | Apr 1983 |
| 705 | Energy Sources I | | Oil & Gas Operator | Jul 1986 |
| 706 | Energy Sources, Inc. | | Oil & Gas Operator | Nov 1990 |
| 707 | Energy Support Services LLC | Cheyenne, WY 82001 | Oil & Gas Operator | Jan 2025 |
| 708 | Energy Three Inc. | Jackson, MS 39211 | Oil & Gas Operator | Dec 2025 |
| 709 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2026 |
| 710 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 711 | Energy Unlimited Inc | | Oil & Gas Operator | Feb 2005 |
| 712 | Energy Well Service, Inc. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2004 |
| 713 | Energy Xxi Gom, LLC | | Oil & Gas Operator | Dec 2023 |
| 714 | Energy Xxi Gulf Coast, Inc. | | Oil & Gas Operator | Dec 2008 |
| 715 | Energy Xxi Onshore, LLC | | Oil & Gas Operator | Dec 2023 |
| 716 | Energy-Vest, Inc. | Bull Shoals, AR 72619 | Oil Operator | Sep 2009 |
| 717 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Apr 2026 |
| 718 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2026 |
| 719 | Energyquest Management, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2021 |
| 720 | Energyquest Operating, L.L.C. | | Oil & Gas Operator | Jun 2023 |
| 721 | Enerjex Kansas, Inc. | Leawood, KS 66211 | Oil & Gas Operator | Apr 2010 |
| 722 | Enernet Inc | Oklahoma City, OK 73102-8004 | Oil & Gas Operator | Nov 2014 |
| 723 | Enerplus Resources USA Corporation | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 724 | Enerquest Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2026 |
| 725 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2026 |
| 726 | Enerquest Operating, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2026 |
| 727 | Enerquest Resources, LLC | Midland, TX 79702 | Oil & Gas Operator | Nov 2005 |
| 728 | Enersearch Inc | Sand Springs, OK 74063 | Oil & Gas Operator | Dec 2013 |
| 729 | Enersource Petroleum Inc | Bixby, OK 74008 | Oil & Gas Operator | Jan 2026 |
| 730 | Enersource Royalty Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2013 |
| 731 | Enerstar Resources LTD Co. | Midland, TX 79701 | Oil & Gas Operator | Jun 2000 |
| 732 | Enerstar Resources, L.C. | Midland, TX 79701 | Oil & Gas Operator | Apr 1999 |
| 733 | Enertec Corporation | Nowata, OK 74048-0632 | Oil & Gas Operator | Sep 2018 |
| 734 | Enertex, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 735 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 736 | Enervest Operating, L.L.C., A Limited Liability Company | | Oil & Gas Operator | Dec 2019 |
| 737 | Enervest Opr LLC | Charleston, WV 25301-1782 | Oil & Gas Operator | Dec 2019 |
| 738 | Enervest Production Partners, LTD. | | Gas Operator | Nov 2024 |
| 739 | Enervest San Juan Operating LLC | Durango, CO 81301 | Gas Operator | Jul 2001 |
| 740 | Enex Resources C | | Gas Operator | Nov 1987 |
| 741 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 742 | Enex Rexources Corp. | | Oil & Gas Operator | Jul 1981 |
| 743 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 744 | Eng, George E. | Midland, TX 79701 | Oil & Gas Operator | Dec 2011 |
| 745 | Engas Corporation | Jacksboro, TX 76458 | Oil & Gas Operator | May 2008 |
| 746 | Engas XP, LLC | Wimberley, TX 78676 | Oil & Gas Operator | Apr 2026 |
| 747 | Engel Farms Corporation | Liberal, KS 67901 | Gas Operator | Mar 2003 |
| 748 | Engel Investments LLC | Hays, KS 67601 | Oil Operator | Aug 2025 |
| 749 | Engelke, R. H. | San Antonio, TX 78230 | Oil & Gas Operator | Apr 2026 |
| 750 | Engelke, Randall Glen | Luling, TX 78648 | Oil & Gas Operator | Jul 2007 |
| 751 | Engeo Co. | | Oil & Gas Operator | Nov 1986 |
| 752 | Engineering & Production Service, Inc. | Farmington, NM 87499 | Oil & Gas Operator | Mar 2026 |
| 753 | Engineers Oil Company | | Oil & Gas Operator | Dec 2025 |
| 754 | England Operating LLC | Littleton, CO 80120-4529 | Oil & Gas Operator | Nov 2014 |
| 755 | Engler, Inc. | Harlingen, TX 78552-0000 | Gas Operator | Dec 2020 |
| 756 | English Oil & Gas | | Oil Operator | Sep 2021 |
| 757 | English Oil And Gas, L.L.C. | | Oil Operator | Sep 2021 |
| 758 | Engroup Resources, L.P. | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 759 | Enhanced Energy Partners Corp | Tomball, TX 77377 | Oil & Gas Operator | Apr 2026 |
| 760 | Enhanced Hydrocarbons Inc | Claremore, OK 74017 | Oil & Gas Operator | May 2013 |
| 761 | Enhanced RS, Inc. | Luling, TX 78648 | Oil Operator | Apr 2026 |
| 762 | Eni Us Operating Co. Inc. | | Oil & Gas Operator | Sep 2024 |
| 763 | Enid Operating, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Apr 2026 |
| 764 | Eninun Inc | Dayton, OH 45415 | Oil & Gas Operator | Dec 1984 |
| 765 | Enline Operating, L.L.C. | Houston, TX 77019 | Oil & Gas Operator | Jun 1998 |
| 766 | Enline Resources, LLC | Houston, TX 77254 | Oil & Gas Operator | Feb 1996 |
| 767 | Enlink Lig, LLC | | Oil Operator | Jan 2025 |
| 768 | Enlo Energy Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 769 | Enloe Jenny L | Skiatook, OK 74070 | Oil Operator | Nov 1998 |
| 770 | Enloe Oil Company | Olney, TX 76374 | Oil & Gas Operator | Jun 2000 |
| 771 | Enmark Gas Gathering LP | Dallas, TX 75252 | Oil & Gas Operator | Dec 2025 |
| 772 | Ennex Inc | | Oil & Gas Operator | Oct 1993 |
| 773 | Ennis Bill H | Sasakwa, OK 74867-0001 | Oil & Gas Operator | Sep 2014 |
| 774 | Enoch Oil | Wichita, KS 67216 | Oil Operator | Jan 2001 |
| 775 | Enogex Exploration Corp | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jun 2000 |
| 776 | Enpower Resources Inc. | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2026 |
| 777 | Enpro LLC | Cottonwood, UT 84047 | Oil & Gas Operator | Nov 2017 |
| 778 | Enpro, Inc | Winchester, KY 40391 | Oil & Gas Operator | Dec 2024 |
| 779 | Enprop Inc | | Oil & Gas Operator | Feb 2013 |
| 780 | Enr Operating, LLC | Eunice, NM 88231 | Oil & Gas Operator | Apr 2026 |
| 781 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 782 | Enre LP | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 783 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 2026 |
| 784 | Enron Corporatio | | Oil & Gas Operator | Aug 1999 |
| 785 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 786 | Enserch Exploration | | Oil & Gas Operator | Oct 1996 |
| 787 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 788 | Enserch Oil & Gas, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 1998 |
| 789 | Ensight Energy Group Inc | Richardson, TX 75080-2370 | Oil & Gas Operator | Jan 2026 |
| 790 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 791 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 792 | Ensight IV Energy Management,LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 793 | Ensight Resources, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 794 | Ensign Oil & Gas Inc. | | Oil & Gas Operator | Jul 1993 |
| 795 | Ensign Operating | | Oil & Gas Operator | Oct 1994 |
| 796 | Ensign Operating Co. | Denver, CO 80202 | Oil & Gas Operator | Jan 2004 |
| 797 | Ensign Operating LLC | Houston, TX 77086 | Oil & Gas Operator | Feb 2023 |
| 798 | Ensminger D & J | | Oil Operator | Dec 1994 |
| 799 | Ensminger Energy LLC | Moran, KS 66755 | Oil Operator | Dec 2025 |
| 800 | Ensminger Oil, LLC | Moran, KS 66755 | Oil Operator | Nov 2025 |