| 701 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 702 | Amerada Hess Corp-Placid | | Gas Operator | Sep 1990 |
| 703 | Amerada Hess Corp. Unit Operator | | Oil & Gas Operator | Dec 1986 |
| 704 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 705 | Amerada Hess-Ethyl Corporation | | Oil & Gas Operator | Sep 1990 |
| 706 | Ameredev New Mexico, LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 707 | Ameredev Operating, LLC | Austin, TX 78746 | Oil & Gas Operator | Jul 2025 |
| 708 | Amerex Corporation | Edmond, OK 73013-1044 | Oil & Gas Operator | Apr 2020 |
| 709 | American B. C. Resources | | Oil & Gas Operator | Oct 1985 |
| 710 | American Barter Petroleum Inc. | | Oil & Gas Operator | Jun 1993 |
| 711 | American Capital Corporation | San Marcos, CA 92069 | Oil & Gas Operator | Sep 2014 |
| 712 | American Cascade Energy, Inc. | Barker, TX 77413 | Oil & Gas Operator | Jul 2025 |
| 713 | American Casing Crews, Inc. | | Oil Operator | Dec 1979 |
| 714 | American Coastal Energy, Inc. | Houston, TX 77225 | Oil & Gas Operator | May 2008 |
| 715 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 716 | American Delta Corporation | Portland, TX 78374 | Oil & Gas Operator | Jun 2013 |
| 717 | American Domestic MGMT Inc | Tulsa, OK 74155 | Oil & Gas Operator | Apr 2015 |
| 718 | American Eagle Energy Corporation | | Oil & Gas Operator | Oct 2015 |
| 719 | American Eagle Oil | Casper, WY 82605 | Oil & Gas Operator | Dec 2012 |
| 720 | American Eagle Operating LLC | Gainesville, TX 76240 | Oil Operator | Jul 2025 |
| 721 | American Eagle Operating, Inc. | Spring, TX 77386 | Oil Operator | Aug 2010 |
| 722 | American Eagle Resources, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2025 |
| 723 | American Energie | | Oil & Gas Operator | May 1995 |
| 724 | American Energies Pipeline, LLC | Dallas, TX 75207 | Oil & Gas Operator | Jan 2015 |
| 725 | American Energy | Abilene, TX 79604 | Oil & Gas Operator | Jul 2004 |
| 726 | American Energy Associates Inc | Cortland, OH 44410 | Oil & Gas Operator | Dec 2024 |
| 727 | American Energy Corporation | Bealsville, OH 43716 | Oil & Gas Operator | Dec 2019 |
| 728 | American Energy Holdings, LLC | Jane Lew, WV 26378 | Oil & Gas Operator | Dec 2021 |
| 729 | American Energy LLC | Lake Zurich, IL 60047-0129 | Oil & Gas Operator | Nov 2014 |
| 730 | American Energy Op. Corp.,The | Houston, TX 77099 | Oil & Gas Operator | Jul 2025 |
| 731 | American Energy Operations Inc | Houston, TX 77002 | Oil & Gas Operator | Nov 1992 |
| 732 | American Energy Partners Inc | Boerne, TX 78006 | Oil & Gas Operator | Dec 2011 |
| 733 | American Energy Recovery Inc | Oklahoma City, OK 73123-0549 | Oil & Gas Operator | Aug 2017 |
| 734 | American Energy Resources, LLC | Belton, MO 64012 | Oil Operator | Nov 2023 |
| 735 | American Energy Sources, Inc. | Spring, TX 77388 | Oil & Gas Operator | Dec 2008 |
| 736 | American Energy Utica LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2015 |
| 737 | American Energy-Perm Basin, LLC | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2016 |
| 738 | American Explora | | Gas Operator | Apr 1994 |
| 739 | American Exploration | Houston, TX 77010 | Gas Operator | Apr 1994 |
| 740 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 741 | American Exploration Oper. Co. | | Oil & Gas Operator | May 1990 |
| 742 | American Explorer, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Jan 1999 |
| 743 | American Helium LLC | | Oil & Gas Operator | May 2025 |
| 744 | American Helium Operating, LLC | Katy, TX 77494 | Oil & Gas Operator | May 2025 |
| 745 | American Hunter Explor LTD | Calgary Alberta Canada, T2P3H5 | Oil & Gas Operator | Dec 1993 |
| 746 | American Inland Resources Company LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2005 |
| 747 | American Int'L Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 748 | American International Energy Corp | | Oil & Gas Operator | Oct 2003 |
| 749 | American Intl Production Inc. | | Oil & Gas Operator | Apr 1993 |
| 750 | American Land And Energy LLC | Castle Pines, CO 80108 | Oil Operator | Mar 2025 |
| 751 | American Lariat | | Oil Operator | Jun 1994 |
| 752 | American National Petroleum Co. | Houston, TX 77057 | Oil & Gas Operator | Aug 1995 |
| 753 | American Natural Energy Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2025 |
| 754 | American Natural Gas, Inc | Saint Clairsville, OH 43950 | Oil & Gas Operator | Dec 2020 |
| 755 | American Natural Resources LLC | Tulsa, OK 74145-1117 | Oil & Gas Operator | May 2020 |
| 756 | American Oil & Gas, Inc. | | Oil & Gas Operator | Nov 2010 |
| 757 | American Oilfield Systems, Inc. | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2001 |
| 758 | American Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2003 |
| 759 | American Petrofina Co Of Texas | | Oil & Gas Operator | Jun 1985 |
| 760 | American Petrofina Co Of TX | Dallas, TX 75221-2159 | Oil & Gas Operator | Nov 2000 |
| 761 | American Petrole | | Oil & Gas Operator | Dec 1996 |
| 762 | American Petroleum & Environmental Consultants Inc | Edmond, OK 73013-8801 | Oil & Gas Operator | Apr 2025 |
| 763 | American Petroleum & Mineral Co Inc | Seminole, OK 74868 | Oil & Gas Operator | Aug 2019 |
| 764 | American Petroleum Corp | Addison, TX 75001 | Oil & Gas Operator | Jul 2025 |
| 765 | American Petroleum Energy Co | | Gas Operator | May 2025 |
| 766 | American Pumping & Trucking | New Braunfels, TX 78131 | Oil & Gas Operator | Jul 2025 |
| 767 | American Quasar Petroleum | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 1985 |
| 768 | American Quasar Petroleum Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2014 |
| 769 | American Quasar-Southland Roy. | | Oil & Gas Operator | Oct 1980 |
| 770 | American Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | Jul 2025 |
| 771 | American Royalty | Caldwell, TX 77836 | Oil & Gas Operator | Oct 2005 |
| 772 | American Shoreline, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2025 |
| 773 | American Southwest Corp. | | Oil & Gas Operator | Dec 1989 |
| 774 | American Star Energy & Min. Corp | Katy, TX 77449 | Oil & Gas Operator | Jul 2025 |
| 775 | American Star Energy & Mineral Corp | Amarillo, TX 79102-2283 | Oil & Gas Operator | Jun 2015 |
| 776 | American Star Energy Services, LLC | Tulsa, OK 74152 | Gas Operator | Mar 2025 |
| 777 | American Tank Service LLC | Hays, KS 67601 | Oil Operator | Mar 2025 |
| 778 | American Trad.&Prod. | | Oil Operator | Dec 1995 |
| 779 | American Trading | | Oil & Gas Operator | Dec 1995 |
| 780 | American Trading & Prod Corp | Houston, TX 77040-6471 | Oil & Gas Operator | Nov 2014 |
| 781 | American Trading Et Al | | Oil & Gas Operator | May 1979 |
| 782 | American Warrior | | Oil & Gas Operator | Mar 2025 |
| 783 | American Warrior Inc | Garden City, KS 67846 | Oil & Gas Operator | Apr 2025 |
| 784 | American West | Burkett, TX 76828 | Oil & Gas Operator | Jul 2025 |
| 785 | American West Resources, Inc | Fort Worth, TX 76161 | Oil & Gas Operator | Jul 2025 |
| 786 | Americana Energy Inc | Byng, OK 74820 | Oil & Gas Operator | Apr 2025 |
| 787 | Americana Petroleum Corp | Waco, TX 76710 | Oil Operator | Aug 1992 |
| 788 | Americase Production Co. | Dallas, TX 75252 | Oil Operator | May 2002 |
| 789 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Jul 2025 |
| 790 | Americo Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2012 |
| 791 | Americus Resources, Inc. | | Oil & Gas Operator | Feb 1993 |
| 792 | Amerikan Oil, LLC | Mound City, KS 66056 | Oil Operator | Mar 2025 |
| 793 | Amerind Oil Co L P | Midland, TX 79701 | Oil & Gas Operator | Nov 2004 |
| 794 | Amerind Oil Company, LTD. | Midland, TX 79701 | Oil & Gas Operator | Nov 2004 |
| 795 | Ameristate Exploration LLC | Austin, TX 78701 | Oil & Gas Operator | Nov 2009 |
| 796 | Ameritech Oil & Gas Corporation | Dallas, TX 75248 | Oil & Gas Operator | May 1996 |
| 797 | Amerkan Resource | | Oil Operator | Jan 1994 |
| 798 | Amerril Energy LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2025 |
| 799 | Amerroyal Energy LLC | Shawnee, OK 74804-4163 | Oil & Gas Operator | Dec 2022 |
| 800 | Ames Financial, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |