| 801 | American Warrior | | Oil & Gas Operator | Dec 2024 |
| 802 | American Warrior Inc | Garden City, KS 67846 | Oil & Gas Operator | Jan 2025 |
| 803 | American West | Burkett, TX 76828 | Oil & Gas Operator | Apr 2025 |
| 804 | American West Resources, Inc | Fort Worth, TX 76161 | Oil & Gas Operator | Apr 2025 |
| 805 | Americana Energy Inc | Byng, OK 74820 | Oil & Gas Operator | Jan 2025 |
| 806 | Americana Petroleum Corp | Waco, TX 76710 | Oil Operator | Aug 1992 |
| 807 | Americase Production Co. | Dallas, TX 75252 | Oil Operator | May 2002 |
| 808 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Apr 2025 |
| 809 | Americo Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2012 |
| 810 | Americus Resources, Inc. | | Oil & Gas Operator | Feb 1993 |
| 811 | Amerikan Oil, LLC | Mound City, KS 66056 | Oil Operator | Dec 2024 |
| 812 | Amerind Oil Co L P | Midland, TX 79701 | Oil & Gas Operator | Nov 2004 |
| 813 | Amerind Oil Company, LTD. | Midland, TX 79701 | Oil & Gas Operator | Nov 2004 |
| 814 | Ameristate Exploration LLC | Austin, TX 78701 | Oil & Gas Operator | Nov 2009 |
| 815 | Ameritech Oil & Gas Corporation | Dallas, TX 75248 | Oil & Gas Operator | May 1996 |
| 816 | Amerkan Resource | | Oil Operator | Jan 1994 |
| 817 | Amerril Energy LLC | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 818 | Amerroyal Energy LLC | Shawnee, OK 74804-4163 | Oil & Gas Operator | Dec 2022 |
| 819 | Ames Financial, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2024 |
| 820 | Ames Oil | Cross Plains, TX 76443 | Oil & Gas Operator | Apr 2025 |
| 821 | Ames Oil And Gas | | Oil & Gas Operator | Apr 1986 |
| 822 | Ames Oil Corporation Of Texas | Austin, TX 78720 | Oil & Gas Operator | Mar 2015 |
| 823 | Ames, C B Dba Ames Oil & Gas | | Oil Operator | Dec 2004 |
| 824 | Ames, Debra B. | Dewittville, NY 14728 | Gas Operator | Dec 2023 |
| 825 | Amex Energy Consults Inc | Columbus, OH 43214 | Oil & Gas Operator | Dec 1988 |
| 826 | Amexco, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2025 |
| 827 | Amherst Energy Holdings, LLC | Highland VLG, TX 75077 | Oil Operator | Apr 2025 |
| 828 | Aminex USA, Inc. | Somerset, TX 78069 | Oil & Gas Operator | May 2018 |
| 829 | Aminoil Of Louisiana, Inc. | | Oil & Gas Operator | Dec 1981 |
| 830 | Aminoil USA Inc | | Oil & Gas Operator | Jan 1985 |
| 831 | Amirmex Inc. | Denver, CO 80234 | Oil & Gas Operator | Apr 2025 |
| 832 | Amistad Energy Services, LLC | Katy, TX 77450 | Oil & Gas Operator | Oct 2017 |
| 833 | Amity Oil Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1977 |
| 834 | Amkay Petroleum Co., Inc. | | Oil Operator | Dec 1991 |
| 835 | Ammo Energy, LLC | Oklahoma City, OK 73160 | Oil & Gas Operator | Feb 2009 |
| 836 | Ammonite Energy Texas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2003 |
| 837 | Amoco Energy Trading Corp | Chicago, IL 60601 | Oil & Gas Operator | Apr 2021 |
| 838 | Amoco Prod Co-Banner Pet LTD | | Oil & Gas Operator | Mar 1981 |
| 839 | Amoco Production | | Oil & Gas Operator | Jun 2012 |
| 840 | Amoco Production Co And C M S Oil And Gas | | Oil & Gas Operator | Sep 1996 |
| 841 | Amoco Production Co And Peninsular Oil And Gas Co | | Oil & Gas Operator | Sep 1998 |
| 842 | Amoco Production Co-Ratliff City | Ratliff City, OK 73081 | Oil Operator | May 1998 |
| 843 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 844 | Amoco Rocmount Company | Denver, CO 80201 | Oil & Gas Operator | Jan 1998 |
| 845 | Amos Zittel & Sons, Inc. | Eden, NY 14057 | Gas Operator | Dec 2023 |
| 846 | Amos, Joe | Wichita, KS 67233 | Oil Operator | Jul 1990 |
| 847 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Apr 2025 |
| 848 | Ample Resources Inc. | | Oil & Gas Operator | Dec 2024 |
| 849 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 850 | Amplify Oklahoma Operating LLC | Houston, TX 77002-4800 | Oil & Gas Operator | Jan 2025 |
| 851 | Ampolex (Texas), Inc. | | Oil & Gas Operator | May 1993 |
| 852 | Ampolex Wy Inc | Gillette, WY 82716 | Oil & Gas Operator | Mar 1997 |
| 853 | Amreco, LLC | El Dorado, AR 71730 | Oil Operator | Jan 2025 |
| 854 | Amrich Energy Inc. | | Oil & Gas Operator | Dec 2022 |
| 855 | Amron Petroleum, Inc. | Midland, TX 79708 | Oil & Gas Operator | Jan 1996 |
| 856 | Ams Energy LLC | Herman, PA 16039-0156 | Oil & Gas Operator | Feb 2025 |
| 857 | Amsito Oil Company LLC | Denton, TX 76206-0689 | Oil Operator | Apr 2001 |
| 858 | Amsito Production Company LLC | | Oil & Gas Operator | Jul 2005 |
| 859 | Amsler Jerry & Denese | Enid, OK 73703-9300 | Oil & Gas Operator | Jul 2020 |
| 860 | Amt Resources, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2025 |
| 861 | Amtech Energy Inc | Plymouth, IL 62367-1016 | Oil & Gas Operator | Dec 2021 |
| 862 | Amtex Energy | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 863 | Amtex Energy, Inc. | Fort Worth, TX 76147 | Oil & Gas Operator | Apr 2025 |
| 864 | Amtex Oil & Gas Inc | Canton, OH 44711 | Oil & Gas Operator | Dec 2004 |
| 865 | Amtuck Oil | Logan, OH 43138 | Oil & Gas Operator | Dec 2010 |
| 866 | Amvest Osage Inc | Skiatook, OK 74070-0970 | Oil & Gas Operator | Jan 2025 |
| 867 | Amwes Exploration, LLC | Barbourville, KY 40906 | Oil & Gas Operator | Dec 2023 |
| 868 | Amx Energy, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Apr 2025 |
| 869 | An-Car Oil Co, Inc | Owensboro, KY 42302-1329-1329 | Oil & Gas Operator | Dec 2014 |
| 870 | An-Son Corporation | Oklahoma City, OK 73124 | Oil & Gas Operator | Jan 2006 |
| 871 | An-Son Transporation | Oklahoma City, OK 73136 | Oil & Gas Operator | Nov 2006 |
| 872 | Anabaco Operating Company | Stillwater, OK 74076-1958 | Oil & Gas Operator | Mar 2014 |
| 873 | Anacapa Oil Corporation | | Gas Operator | Dec 2024 |
| 874 | Anadarko Austin Chalk Company | Houston, TX 77251 | Oil & Gas Operator | Feb 2006 |
| 875 | Anadarko Basin Oil& Gas Lease Inc | Sayre, OK 73662 | Oil & Gas Operator | Jan 1997 |
| 876 | Anadarko Disposal | El Reno, OK 73036 | Oil & Gas Operator | Jun 2014 |
| 877 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 878 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 879 | Anadarko Gathering Co. | Houston, TX 77251 | Oil & Gas Operator | Jul 2001 |
| 880 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 881 | Anadarko Ogc Company | Houston, TX 77251 | Oil & Gas Operator | Dec 1998 |
| 882 | Anadarko Petrole | | Oil & Gas Operator | Dec 1996 |
| 883 | Anadarko Petroleum | | Oil & Gas Operator | Oct 2007 |
| 884 | Anadarko Petroleum Co | Houston, TX 77227 | Oil & Gas Operator | Feb 1998 |
| 885 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Feb 2025 |
| 886 | Anadarko Prod | | Oil & Gas Operator | Dec 1996 |
| 887 | Anadarko Production Co. | | Oil Operator | Feb 1989 |
| 888 | Anadime Energy Services Inc. | | Oil & Gas Operator | Dec 2009 |
| 889 | Analena Corporation | Dallas, TX 75251 | Oil Operator | Jun 2000 |
| 890 | Ananda Energy Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2021 |
| 891 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 892 | Anaqua Operating Company LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 893 | Anatexas Offshore, Inc. | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 894 | Anathema, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Dec 1994 |
| 895 | Anc Investments LLC | Enid, OK 73701-1823 | Gas Operator | Jan 2025 |
| 896 | Ancell Oil Co. | Wichita Falls, TX 76309 | Oil & Gas Operator | Dec 2018 |
| 897 | Anchor B Production, Inc. | Orla, TX 79770 | Oil & Gas Operator | Aug 2003 |
| 898 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 899 | Anchor Bay Petroleum | Hays, KS 67601 | Oil Operator | Dec 2024 |
| 900 | Anchor Bay Petroleum LLC | Hays, KS 67601 | Oil Operator | Dec 2024 |