| 801 | Ameristate Exploration LLC | Austin, TX 78701 | Oil & Gas Operator | Nov 2009 |
| 802 | Ameritech Oil & Gas Corporation | Dallas, TX 75248 | Oil & Gas Operator | May 1996 |
| 803 | Amerkan Resource | | Oil Operator | Jan 1994 |
| 804 | Amerril Energy LLC | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 805 | Amerroyal Energy LLC | Shawnee, OK 74804-4163 | Oil & Gas Operator | Dec 2022 |
| 806 | Ames Financial, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 807 | Ames Oil | Cross Plains, TX 76443 | Oil & Gas Operator | Dec 2025 |
| 808 | Ames Oil And Gas | | Oil & Gas Operator | Apr 1986 |
| 809 | Ames Oil Corporation Of Texas | Austin, TX 78720 | Oil & Gas Operator | Mar 2015 |
| 810 | Ames, C B Dba Ames Oil & Gas | | Oil Operator | Dec 2004 |
| 811 | Ames, Debra B. | Dewittville, NY 14728 | Gas Operator | Dec 2024 |
| 812 | Amex Energy Consults Inc | Columbus, OH 43214 | Oil & Gas Operator | Dec 1988 |
| 813 | Amexco, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Dec 2025 |
| 814 | Amherst Energy Holdings, LLC | Highland VLG, TX 75077 | Oil Operator | Dec 2025 |
| 815 | Aminex USA, Inc. | Somerset, TX 78069 | Oil & Gas Operator | May 2018 |
| 816 | Aminoil Of Louisiana, Inc. | | Oil & Gas Operator | Dec 1981 |
| 817 | Aminoil USA Inc | | Oil & Gas Operator | Jan 1985 |
| 818 | Amirmex Inc. | Denver, CO 80234 | Oil & Gas Operator | Dec 2025 |
| 819 | Amistad Energy Services, LLC | Katy, TX 77450 | Oil & Gas Operator | Oct 2017 |
| 820 | Amity Oil Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1977 |
| 821 | Amkay Petroleum Co., Inc. | | Oil Operator | Dec 1991 |
| 822 | Ammo Energy, LLC | Oklahoma City, OK 73160 | Oil & Gas Operator | Feb 2009 |
| 823 | Ammonite Energy Texas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2003 |
| 824 | Ammons, Dean E | | Oil Operator | Jan 2021 |
| 825 | Amoco Prod Co-Banner Pet LTD | | Oil & Gas Operator | Mar 1981 |
| 826 | Amoco Production | | Oil & Gas Operator | Jun 2012 |
| 827 | Amoco Production Co And C M S Oil And Gas | | Oil & Gas Operator | Sep 1996 |
| 828 | Amoco Production Co And Peninsular Oil And Gas Co | | Oil & Gas Operator | Sep 1998 |
| 829 | Amoco Production Co-Ratliff City | Ratliff City, OK 73081 | Oil Operator | May 1998 |
| 830 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 831 | Amoco Rocmount Company | Denver, CO 80201 | Oil & Gas Operator | Jan 1998 |
| 832 | Amos Zittel & Sons, Inc. | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 833 | Amos, Joe | Wichita, KS 67233 | Oil Operator | Jul 1990 |
| 834 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2025 |
| 835 | Ample Resources Inc. | | Oil & Gas Operator | Sep 2025 |
| 836 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 837 | Amplify Oklahoma Operating LLC | Houston, TX 77002-4800 | Oil & Gas Operator | Aug 2025 |
| 838 | Ampolex (Texas), Inc. | | Oil & Gas Operator | May 1993 |
| 839 | Ampolex Wy Inc | Gillette, WY 82716 | Oil & Gas Operator | Mar 1997 |
| 840 | Amreco, LLC | El Dorado, AR 71730 | Oil Operator | Jan 2025 |
| 841 | Amrich Energy Inc. | | Oil & Gas Operator | Sep 2025 |
| 842 | Amron Petroleum, Inc. | Midland, TX 79708 | Oil & Gas Operator | Jan 1996 |
| 843 | Ams Energy LLC | Herman, PA 16039-0156 | Oil & Gas Operator | Sep 2025 |
| 844 | Ams Energy Solutions LLP | Katy, TX 77493 | Oil Operator | Dec 2025 |
| 845 | Amsito Oil Company LLC | Denton, TX 76206-0689 | Oil Operator | Apr 2001 |
| 846 | Amsler Jerry & Denese | Enid, OK 73703-9300 | Oil & Gas Operator | Jul 2020 |
| 847 | Amt Resources, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 2025 |
| 848 | Amtech Energy Inc | Plymouth, IL 62367-1016 | Oil & Gas Operator | Dec 2021 |
| 849 | Amtex Energy | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 850 | Amtex Energy, Inc. | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 851 | Amtex Oil & Gas Inc | Canton, OH 44711 | Oil & Gas Operator | Dec 2004 |
| 852 | Amtuck Oil | Logan, OH 43138 | Oil & Gas Operator | Dec 2010 |
| 853 | Amvest Osage Inc | Skiatook, OK 74070-0970 | Oil & Gas Operator | Aug 2025 |
| 854 | Amwes Exploration, LLC | Barbourville, KY 40906 | Oil & Gas Operator | Dec 2023 |
| 855 | Amx Energy, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Dec 2025 |
| 856 | An-Car Oil Co Inc | Owensboro, KY 42302-1329 | Oil & Gas Operator | Dec 2014 |
| 857 | An-Son Corp | Oklahoma City, OK 73124 | Oil & Gas Operator | Jan 2006 |
| 858 | Anabaco Operating Company | Stillwater, OK 74076-1958 | Oil & Gas Operator | Mar 2014 |
| 859 | Anacapa Oil Corporation | | Gas Operator | Sep 2025 |
| 860 | Anadarko Austin Chalk Company | Houston, TX 77251 | Oil & Gas Operator | Feb 2006 |
| 861 | Anadarko Basin Oil& Gas Lease Inc | Sayre, OK 73662 | Oil & Gas Operator | Jan 1997 |
| 862 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 863 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 864 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 865 | Anadarko Ogc Company | Houston, TX 77251 | Oil & Gas Operator | Dec 1998 |
| 866 | Anadarko Petrole | | Oil & Gas Operator | Dec 1996 |
| 867 | Anadarko Petroleum | | Oil & Gas Operator | Oct 2007 |
| 868 | Anadarko Petroleum Co | Houston, TX 77227 | Oil & Gas Operator | Feb 1998 |
| 869 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2025 |
| 870 | Anadarko Prod | | Oil & Gas Operator | Dec 1996 |
| 871 | Anadarko Production Co. | | Oil Operator | Feb 1989 |
| 872 | Anadime Energy Services Inc. | | Oil & Gas Operator | Dec 2009 |
| 873 | Analena Corporation | Dallas, TX 75251 | Oil Operator | Jun 2000 |
| 874 | Ananda Energy Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2021 |
| 875 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 876 | Anatexas Offshore, Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 877 | Anathema, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Dec 1994 |
| 878 | Anc Investments LLC | Enid, OK 73701-1823 | Gas Operator | Aug 2025 |
| 879 | Ancell Oil Co. | Wichita Falls, TX 76309 | Oil & Gas Operator | Dec 2018 |
| 880 | Anchor B Production, Inc. | Orla, TX 79770 | Oil & Gas Operator | Aug 2003 |
| 881 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 882 | Anchor Bay Petroleum | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 883 | Anchor Bay Petroleum LLC | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 884 | Anchor Oil Company | Gruver, TX 79040 | Gas Operator | Dec 2025 |
| 885 | Anchor Operating Co. | Houston, TX 77055 | Oil & Gas Operator | Dec 2025 |
| 886 | Anchor Petroleum, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | Jan 1996 |
| 887 | Anchorage Oil & Gas Inc | Oklahoma City, OK 73128-1422 | Oil & Gas Operator | Oct 1999 |
| 888 | Ancient Sands Inc | Kittanning, PA 16201-0916 | Oil & Gas Operator | Dec 2008 |
| 889 | Anco Account | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 1995 |
| 890 | Ancora-Verde Corporation | | Oil & Gas Operator | Dec 2004 |
| 891 | Andalucia Oil Company | San Antonio, TX 78258 | Oil Operator | Dec 2025 |
| 892 | Andco Mud Inc | Edmond, OK 73034-3910 | Oil & Gas Operator | Mar 2006 |
| 893 | Andector Exploration Company | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 894 | Anderman/Smith Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1995 |
| 895 | Anderson Art Tan | | Oil Operator | Jul 1988 |
| 896 | Anderson Bobby B | Fleming, OH 45729 | Oil & Gas Operator | Dec 2024 |
| 897 | Anderson Energy Corporation | Arvada, CO 80004 | Oil & Gas Operator | Dec 2025 |
| 898 | Anderson Energy Inc | Wichita, KS 67278 | Oil & Gas Operator | Apr 2025 |
| 899 | Anderson Energy SVC LLC | Clarendon, PA 16313-4238 | Oil & Gas Operator | Dec 2024 |
| 900 | Anderson Exploration Co., Inc. | | Oil & Gas Operator | Sep 2023 |