| 601 | Enercap Corporation | Kingwood, TX 77325 | Oil & Gas Operator | Aug 2003 |
| 602 | Enerco Energy Corporation | Norman, OK 73069-6643 | Oil & Gas Operator | Apr 2020 |
| 603 | Enerco Exploration & MGMT. Co. | | Oil & Gas Operator | Aug 1981 |
| 604 | Enerco Operating Corporation | Dallas, TX 75240 | Oil & Gas Operator | Jan 2025 |
| 605 | Enercorp Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 1993 |
| 606 | Enerdril Corporation | Moran, TX 76464 | Gas Operator | Dec 2015 |
| 607 | Enerdyne, LLC | Albuquerque, NM 87123 | Oil & Gas Operator | Feb 2026 |
| 608 | Enerex Limited Liability Co | Craig, CO 81625 | Oil & Gas Operator | Sep 2025 |
| 609 | Enerex Supply, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Nov 1993 |
| 610 | Enerfin Field Services LLC | Houston, TX 77077 | Oil Operator | Nov 2024 |
| 611 | Enerfin Gathering-East LLC | Houston, TX 77077 | Oil & Gas Operator | Nov 2022 |
| 612 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |
| 613 | Enerfin Resources II-92 L.P. | Houston, TX 77077 | Oil & Gas Operator | Sep 2025 |
| 614 | Enerfin Resources Northwest Limited Partnership | | Oil & Gas Operator | Jan 2022 |
| 615 | Energas Corporation | Oklahoma City, OK 73105 | Oil & Gas Operator | Jul 2025 |
| 616 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 617 | Energen Resources Maq Inc | Birmingham, AL 35203 | Oil & Gas Operator | Sep 2000 |
| 618 | Energetics Inc | Englewood, CO 80155 | Oil & Gas Operator | Aug 1985 |
| 619 | Energex Corp | Springfield, MO 65807 | Oil & Gas Operator | Feb 2026 |
| 620 | Energex Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2026 |
| 621 | Energex Petroleum Inc | | Oil Operator | Sep 2019 |
| 622 | Energex, LLC | Scottsdale, AZ 85255 | Oil & Gas Operator | Sep 2024 |
| 623 | Energon Oil & Gas Inc. | Odessa, TX 79762 | Oil & Gas Operator | Aug 2003 |
| 624 | Energon Oil, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Apr 2026 |
| 625 | Energon3 | Rowlett, TX 75089 | Oil Operator | Apr 2026 |
| 626 | Energy & Expl. PRTNRS Oper., LP | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2016 |
| 627 | Energy + Savings, L.L.C. | Alamo, TX 78516 | Oil & Gas Operator | Jan 2008 |
| 628 | Energy 2000, Inc. | Reno, NV 89501 | Oil & Gas Operator | Apr 2026 |
| 629 | Energy Acquisition Corp And Weitzman Irvin | | Oil & Gas Operator | Dec 2003 |
| 630 | Energy Acquisition Corp W W Energy Weitzman Irvin | | Oil & Gas Operator | Jun 2016 |
| 631 | Energy Acquisitions, Inc. | Spring, TX 77379 | Oil & Gas Operator | Apr 1996 |
| 632 | Energy Alliance Company Inc | | Oil & Gas Operator | Jan 2018 |
| 633 | Energy Associates, Inc | Lexington, KY 40502 | Oil & Gas Operator | Dec 2024 |
| 634 | Energy Contractors, Inc. | Canal Wincheste, OH 43110 | Oil & Gas Operator | Dec 2019 |
| 635 | Energy Corp Of Amer | Charleston, WV 25311-1264 | Oil & Gas Operator | Mar 2018 |
| 636 | Energy Corp. Of America, Inc. | | Oil & Gas Operator | Aug 1998 |
| 637 | Energy Corporation Of America | Charleston, WV 25311 | Oil & Gas Operator | Dec 2024 |
| 638 | Energy Dev Corp | | Oil & Gas Operator | Mar 1998 |
| 639 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2025 |
| 640 | Energy Development Of California Inc. | | Oil & Gas Operator | Dec 2004 |
| 641 | Energy Distributors Inc | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1987 |
| 642 | Energy Enterprises, LLC | MT Vernon, IL 62864 | Oil Operator | Dec 2023 |
| 643 | Energy Environment Inc | Holdenville, OK 74848-0765 | Oil & Gas Operator | Jul 2016 |
| 644 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Feb 2026 |
| 645 | Energy Exchange Corporation | Oklahoma City, OK 73112 | Oil Operator | Jan 2026 |
| 646 | Energy Explorati | | Oil & Gas Operator | Oct 1993 |
| 647 | Energy Exploration & Development | Cortland, OH 44410 | Oil & Gas Operator | Dec 2024 |
| 648 | Energy Exploration & Production, Inc. | Wichita, KS 67201 | Oil Operator | Jan 2004 |
| 649 | Energy Exploration Co | | Oil & Gas Operator | Feb 1991 |
| 650 | Energy Finders, Inc. | | Oil & Gas Operator | Dec 1981 |
| 651 | Energy From Texas, L. P. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2013 |
| 652 | Energy Frontiers Partners, LP | Grapevine, TX 76051 | Oil Operator | May 2008 |
| 653 | Energy Group Of America, Inc. | Hollister, MO 65672 | Oil Operator | Apr 2026 |
| 654 | Energy Hunter Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Feb 2019 |
| 655 | Energy Investments Inc. | | Oil & Gas Operator | Oct 2025 |
| 656 | Energy Lease Service Inc | Drumright, OK 74030-7403 | Oil & Gas Operator | Jan 2026 |
| 657 | Energy Managemen | | Oil & Gas Operator | Jul 1991 |
| 658 | Energy Management Company | Kilgore, TX 75663 | Oil Operator | Apr 2020 |
| 659 | Energy Management Company Of Texas | | Oil & Gas Operator | Dec 2024 |
| 660 | Energy Management Corp. | | Oil & Gas Operator | Apr 1999 |
| 661 | Energy Marketing | | Oil & Gas Operator | May 1995 |
| 662 | Energy Marketing, Inc. | Omaha, NE 68102 | Oil & Gas Operator | Jul 2005 |
| 663 | Energy Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Apr 2026 |
| 664 | Energy One Oil Operations | | Oil Operator | Mar 2003 |
| 665 | Energy Onramp LLC | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 666 | Energy Operating Company Inc | Lakewood, CO 80235 | Oil & Gas Operator | Dec 2012 |
| 667 | Energy Operating Corporation | Plano, TX 75093-4409 | Oil & Gas Operator | Sep 2013 |
| 668 | Energy Operations Oklahoma LP | Houston, TX 77002-6785 | Oil & Gas Operator | Nov 2010 |
| 669 | Energy Partners, LTD. | New Orleans, LA 70170 | Oil & Gas Operator | Aug 2012 |
| 670 | Energy Prod Management Corp | | Oil & Gas Operator | Oct 1991 |
| 671 | Energy Producers Inc | | Oil Operator | Nov 1989 |
| 672 | Energy Productio | | Oil & Gas Operator | Jan 1986 |
| 673 | Energy Production & Sales Co. | | Oil & Gas Operator | Dec 1999 |
| 674 | Energy Production Co | Pittsburgh, PA 15241-3949 | Oil & Gas Operator | Dec 1994 |
| 675 | Energy Production Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2026 |
| 676 | Energy Production Service Inc | | Oil Operator | Mar 1986 |
| 677 | Energy Production Services LLC | Oklahoma City, OK 73162-4736 | Oil & Gas Operator | Apr 2020 |
| 678 | Energy Production, Inc. | Canton, OH 44711 | Oil & Gas Operator | Dec 2021 |
| 679 | Energy Program Accompany | | Oil Operator | Dec 2006 |
| 680 | Energy Properties Inc. | | Oil & Gas Operator | Dec 2023 |
| 681 | Energy Prospector'S Inc | | Oil & Gas Operator | Jun 1997 |
| 682 | Energy Recovery Group LLC | | Oil & Gas Operator | Jul 2008 |
| 683 | Energy Research & Dev. Corp. | | Oil & Gas Operator | Feb 1998 |
| 684 | Energy Reserves | | Oil & Gas Operator | Oct 1993 |
| 685 | Energy Reserves GP-Kanaba Oil | | Oil & Gas Operator | Aug 1985 |
| 686 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 687 | Energy Reserves Group LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2018 |
| 688 | Energy Reserves Group, Inc. | Wichita, KS 67202 | Oil & Gas Operator | May 2002 |
| 689 | Energy Resource & Develop., Corp | Rockwall, TX 75087 | Oil & Gas Operator | Jun 1998 |
| 690 | Energy Resource Associates Inc | | Gas Operator | Nov 1988 |
| 691 | Energy Resource Management, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Mar 2008 |
| 692 | Energy Resource Technology Gom, LLC | | Oil & Gas Operator | Oct 2019 |
| 693 | Energy Resources Dev Inc | Bixby, OK 74008-3658 | Oil & Gas Operator | Jan 2026 |
| 694 | Energy Resources LLC | Owensboro, KY 42301 | Oil Operator | Feb 2026 |
| 695 | Energy Resources Of Amer Inc | Columbiana, OH 44408 | Oil & Gas Operator | Dec 2021 |
| 696 | Energy Resources Of America Inc | North Jackson, OH 44451 | Oil & Gas Operator | Dec 2022 |
| 697 | Energy Resources Oil & Gas Corp. | Amarillo, TX 79102 | Oil & Gas Operator | Jun 1994 |
| 698 | Energy RSRVS GRP-Lavino-Traver | | Oil & Gas Operator | Aug 1985 |
| 699 | Energy Search Company Inc | Aurora, CO 80011 | Oil & Gas Operator | Jun 2021 |
| 700 | Energy Search Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |