| 701 | Amax Petroleum C | | Oil & Gas Operator | Aug 1986 |
| 702 | Amax Petroleum Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2012 |
| 703 | Amax Petroluem Corp. | | Oil & Gas Operator | Nov 1983 |
| 704 | Amazon Exploration LLC | | Oil Operator | Apr 2016 |
| 705 | Amazon Royalties, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Feb 2026 |
| 706 | Ambassador Oil Company, LLC | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 707 | Ambassador Petroleum, Inc. | Katy, TX 77494 | Oil & Gas Operator | Feb 2026 |
| 708 | Amber Oil Compan | | Oil Operator | Aug 1995 |
| 709 | Amberex Corporation | Denver, CO 80237 | Oil & Gas Operator | Sep 1984 |
| 710 | Amble Petroleum Co., Inc. | Tuscola, TX 79562 | Oil Operator | Sep 2025 |
| 711 | Ambra Oil & Gas Company | Rangely, CO 81648 | Oil & Gas Operator | Jul 2006 |
| 712 | Ambrit Energy Corp. | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 713 | Ambrotra Energy LLC | Medicine Lodge, KS 67104 | Oil Operator | Aug 2025 |
| 714 | Amcole Energy Corporation | Dallas, TX 75231 | Oil & Gas Operator | Aug 2000 |
| 715 | Amcon Resources | Oklahoma City, OK 73102 | Gas Operator | Jul 2000 |
| 716 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 717 | Amedan Resources, Inc. | Chickasha, OK 73023 | Oil & Gas Operator | Mar 2008 |
| 718 | Amen Oil LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 719 | Amend Energy Company | Houston, TX 77227 | Oil & Gas Operator | Apr 2002 |
| 720 | Amer Energy Develop Inc | Columbus, OH 43220 | Oil & Gas Operator | Dec 1989 |
| 721 | Amer Exploration Co | Plymouth Meeting, PA 19462-1640 | Oil & Gas Operator | Dec 2008 |
| 722 | Amer Natural Resources LLC | Rural Valley, PA 16249-0306 | Oil & Gas Operator | Dec 2018 |
| 723 | Amer Oil & Gas LLC | MT Morris, PA 15349 | Oil & Gas Operator | Dec 2025 |
| 724 | Amer Pipeline & Exp & Co | Morgantown, WV 26507 | Oil & Gas Operator | Dec 1986 |
| 725 | Amer-Tex Energy Inc | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Feb 2012 |
| 726 | Amer. Intl. Petroleum Corp. | | Oil & Gas Operator | Dec 1990 |
| 727 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 728 | Amerada Hess Corp-Placid | | Gas Operator | Sep 1990 |
| 729 | Amerada Hess Corp. Operator | | Gas Operator | Dec 1985 |
| 730 | Amerada Hess Corp. Unit Operator | | Oil & Gas Operator | Dec 1986 |
| 731 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 732 | Amerada Hess-Ethyl Corporation | | Oil & Gas Operator | Sep 1990 |
| 733 | Ameredev New Mexico, LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 734 | Ameredev Operating, LLC | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 735 | Amerex Corporation | Edmond, OK 73013-1044 | Oil & Gas Operator | Apr 2020 |
| 736 | American B. C. Resources | | Oil & Gas Operator | Oct 1985 |
| 737 | American Barter Petroleum Inc. | | Oil & Gas Operator | Jun 1993 |
| 738 | American Capital Corporation | San Marcos, CA 92069 | Oil & Gas Operator | Sep 2014 |
| 739 | American Cascade Energy, Inc. | Barker, TX 77413 | Oil & Gas Operator | Feb 2026 |
| 740 | American Casing Crews, Inc. | | Oil Operator | Dec 1979 |
| 741 | American Coastal Energy, Inc. | Houston, TX 77225 | Oil & Gas Operator | May 2008 |
| 742 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 743 | American Contine | | Gas Operator | Jun 1991 |
| 744 | American Delta Corporation | Portland, TX 78374 | Oil & Gas Operator | Jun 2013 |
| 745 | American Domestic MGMT Inc | Tulsa, OK 74155 | Oil & Gas Operator | Apr 2015 |
| 746 | American Eagle Energy Corporation | | Oil & Gas Operator | Oct 2015 |
| 747 | American Eagle Oil | Casper, WY 82605 | Oil & Gas Operator | Dec 2012 |
| 748 | American Eagle Operating LLC | Gainesville, TX 76240 | Oil Operator | Feb 2026 |
| 749 | American Eagle Operating, Inc. | Spring, TX 77386 | Oil Operator | Aug 2010 |
| 750 | American Eagle Resources, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |
| 751 | American Energie | | Oil & Gas Operator | May 1995 |
| 752 | American Energies Pipeline, LLC | Dallas, TX 75207 | Oil & Gas Operator | Jan 2015 |
| 753 | American Energy | Abilene, TX 79604 | Oil & Gas Operator | Jul 2004 |
| 754 | American Energy Associates Inc | Cortland, OH 44410 | Oil & Gas Operator | Dec 2024 |
| 755 | American Energy Corporation | Bealsville, OH 43716 | Oil & Gas Operator | Dec 2019 |
| 756 | American Energy Holdings, LLC | Jane Lew, WV 26378 | Oil & Gas Operator | Dec 2021 |
| 757 | American Energy LLC | Lake Zurich, IL 60047-0129 | Oil & Gas Operator | Nov 2014 |
| 758 | American Energy Op. Corp.,The | Houston, TX 77099 | Oil & Gas Operator | Feb 2026 |
| 759 | American Energy Operations Inc | Houston, TX 77002 | Oil & Gas Operator | Nov 1992 |
| 760 | American Energy Partners Inc | Boerne, TX 78006 | Oil & Gas Operator | Dec 2011 |
| 761 | American Energy Recovery Inc | Oklahoma City, OK 73123-0549 | Oil & Gas Operator | Aug 2017 |
| 762 | American Energy Resources, LLC | Belton, MO 64012 | Oil Operator | Aug 2025 |
| 763 | American Energy Sources, Inc. | Spring, TX 77388 | Oil & Gas Operator | Dec 2008 |
| 764 | American Energy Texas Inc | Mineral Wells, TX 76067 | Oil Operator | Feb 2026 |
| 765 | American Energy Utica LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2015 |
| 766 | American Energy-Perm Basin, LLC | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2016 |
| 767 | American Explora | | Gas Operator | Apr 1994 |
| 768 | American Exploration | Houston, TX 77010 | Gas Operator | Apr 1994 |
| 769 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 770 | American Exploration Oper. Co. | | Oil & Gas Operator | May 1990 |
| 771 | American Explorer, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Jan 1999 |
| 772 | American Helium LLC | | Oil & Gas Operator | Nov 2025 |
| 773 | American Helium Operating, LLC | Katy, TX 77494 | Oil & Gas Operator | Nov 2025 |
| 774 | American Hunter Explor LTD | Calgary Alberta Canada, T2P3H5 | Oil & Gas Operator | Dec 1993 |
| 775 | American Inland Resources Company LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2005 |
| 776 | American Int'L Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 777 | American Intl Production Inc. | | Oil & Gas Operator | Apr 1993 |
| 778 | American Land And Energy LLC | Castle Pines, CO 80108 | Oil Operator | Jun 2025 |
| 779 | American Lariat | | Oil Operator | Jun 1994 |
| 780 | American Midwest Oil & Gas Corp. | Billings, MT 59101 | Gas Operator | Jun 2021 |
| 781 | American National Petroleum Co. | Houston, TX 77057 | Oil & Gas Operator | Aug 1995 |
| 782 | American Natural Energy Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2025 |
| 783 | American Natural Gas Inc | Saint Clairsville, OH 43950 | Oil & Gas Operator | Dec 2020 |
| 784 | American Natural Resources LLC | Tulsa, OK 74145-1117 | Oil & Gas Operator | May 2020 |
| 785 | American Oil & Gas, Inc. | | Oil & Gas Operator | Nov 2010 |
| 786 | American Oilfield Systems, Inc. | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2001 |
| 787 | American Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2003 |
| 788 | American Petrofina Co Of Texas | | Oil & Gas Operator | Jun 1985 |
| 789 | American Petrofina Co Of TX | Dallas, TX 75221-2159 | Oil & Gas Operator | Nov 2000 |
| 790 | American Petrole | | Oil & Gas Operator | Dec 1996 |
| 791 | American Petroleum & Environmental Consultants Inc | Edmond, OK 73013-8801 | Oil & Gas Operator | Nov 2025 |
| 792 | American Petroleum & Mineral Co Inc | Seminole, OK 74868 | Oil & Gas Operator | Aug 2019 |
| 793 | American Petroleum Corp | Addison, TX 75001 | Oil & Gas Operator | Feb 2026 |
| 794 | American Petroleum Energy Co | | Gas Operator | Dec 2025 |
| 795 | American Petroleum Exploration Corp. | Wichita, KS 67201 | Gas Operator | Feb 2002 |
| 796 | American Pumping & Trucking | New Braunfels, TX 78131 | Oil & Gas Operator | Feb 2026 |
| 797 | American Quasar Petroleum | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 1985 |
| 798 | American Quasar Petroleum Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2014 |
| 799 | American Quasar-Southland Roy. | | Oil & Gas Operator | Oct 1980 |
| 800 | American Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | Feb 2026 |