| 801 | Aminoil USA Inc | | Oil & Gas Operator | Jan 1985 |
| 802 | Amirmex Inc. | Denver, CO 80234 | Oil & Gas Operator | Nov 2024 |
| 803 | Amistad Energy Services, LLC | Katy, TX 77450 | Oil & Gas Operator | Oct 2017 |
| 804 | Amity Oil Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1977 |
| 805 | Amkay Petroleum Co., Inc. | | Oil Operator | Dec 1991 |
| 806 | Ammonite Energy Texas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2003 |
| 807 | Amoco Energy Trading Corp | Chicago, IL 60601 | Oil & Gas Operator | Apr 2021 |
| 808 | Amoco Prod Co-Banner Pet LTD | | Oil & Gas Operator | Mar 1981 |
| 809 | Amoco Production | | Oil & Gas Operator | Jun 2012 |
| 810 | Amoco Production Co And C M S Oil And Gas | | Oil & Gas Operator | Sep 1996 |
| 811 | Amoco Production Co And Peninsular Oil And Gas Co | | Oil & Gas Operator | Sep 1998 |
| 812 | Amoco Production Co-Ratliff City | Ratliff City, OK 73081 | Oil Operator | May 1998 |
| 813 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 814 | Amoco Rocmount Company | Denver, CO 80201 | Oil & Gas Operator | Jan 1998 |
| 815 | Amos, Joe | Wichita, KS 67233 | Oil Operator | Jul 1990 |
| 816 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Nov 2024 |
| 817 | Ample Resources Inc. | | Oil & Gas Operator | Aug 2024 |
| 818 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 819 | Amplify Oklahoma Operating LLC | Houston, TX 77002-4800 | Oil & Gas Operator | Aug 2024 |
| 820 | Ampolex (Texas), Inc. | | Oil & Gas Operator | May 1993 |
| 821 | Ampolex Wy Inc | Gillette, WY 82716 | Oil & Gas Operator | Mar 1997 |
| 822 | Amreco, LLC | El Dorado, AR 71730 | Oil Operator | Jul 2024 |
| 823 | Amrich Energy Inc. | | Oil & Gas Operator | Dec 2022 |
| 824 | Amron Petroleum, Inc. | Midland, TX 79708 | Oil & Gas Operator | Jan 1996 |
| 825 | Ams Energy LLC | Herman, PA 16039-0156 | Oil & Gas Operator | Aug 2024 |
| 826 | Ams Energy Solutions LLP | Katy, TX 77493 | Oil Operator | Nov 2024 |
| 827 | Amsito Oil Company LLC | Denton, TX 76206-0689 | Oil Operator | Apr 2001 |
| 828 | Amsito Production Company LLC | | Oil & Gas Operator | Jul 2005 |
| 829 | Amsler Jerry & Denese | Enid, OK 73703-9300 | Oil & Gas Operator | Jul 2020 |
| 830 | Amt Resources, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Nov 2024 |
| 831 | Amtech Energy Inc | Plymouth, IL 62367-1016 | Oil & Gas Operator | Dec 2021 |
| 832 | Amtex Energy | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 833 | Amtex Energy, Inc. | Fort Worth, TX 76147 | Oil & Gas Operator | Nov 2024 |
| 834 | Amtex Oil & Gas Inc | Canton, OH 44711 | Oil & Gas Operator | Dec 2004 |
| 835 | Amtuck Oil | Logan, OH 43138 | Oil & Gas Operator | Dec 2010 |
| 836 | Amvest Osage Inc | Skiatook, OK 74070-0970 | Oil & Gas Operator | Aug 2024 |
| 837 | Amwes Exploration, LLC | Barbourville, KY 40906 | Oil & Gas Operator | Dec 2022 |
| 838 | Amx Energy, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 2024 |
| 839 | An-Car Oil Co, Inc | Owensboro, KY 42302-1329-1329 | Oil & Gas Operator | Dec 2014 |
| 840 | An-Son Corporation | Oklahoma City, OK 73124 | Oil & Gas Operator | Jan 2006 |
| 841 | An-Son Transporation | Oklahoma City, OK 73136 | Oil & Gas Operator | Nov 2006 |
| 842 | Anabaco Operating Company | Stillwater, OK 74076-1958 | Oil & Gas Operator | Mar 2014 |
| 843 | Anacapa Oil Corporation | | Gas Operator | Aug 2024 |
| 844 | Anadarko Austin Chalk Company | Houston, TX 77251 | Oil & Gas Operator | Feb 2006 |
| 845 | Anadarko Basin Oil& Gas Lease Inc | Sayre, OK 73662 | Oil & Gas Operator | Jan 1997 |
| 846 | Anadarko Disposal | El Reno, OK 73036 | Oil & Gas Operator | Jun 2014 |
| 847 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 848 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 849 | Anadarko Gathering Co. | Houston, TX 77251 | Oil & Gas Operator | Jul 2001 |
| 850 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2024 |
| 851 | Anadarko Ogc Company | Houston, TX 77251 | Oil & Gas Operator | Dec 1998 |
| 852 | Anadarko Petrole | | Oil & Gas Operator | Dec 1996 |
| 853 | Anadarko Petroleum | | Oil & Gas Operator | Oct 2007 |
| 854 | Anadarko Petroleum Co | Houston, TX 77227 | Oil & Gas Operator | Feb 1998 |
| 855 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2024 |
| 856 | Anadarko Prod | | Oil & Gas Operator | Dec 1996 |
| 857 | Anadarko Production Co. | | Oil Operator | Feb 1989 |
| 858 | Anadime Energy Services Inc. | | Oil & Gas Operator | Dec 2009 |
| 859 | Analena Corporation | Dallas, TX 75251 | Oil Operator | Jun 2000 |
| 860 | Ananda Energy Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2021 |
| 861 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 862 | Anatexas Offshore, Inc. | Houston, TX 77024 | Oil & Gas Operator | Nov 2024 |
| 863 | Anathema, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Dec 1994 |
| 864 | Anc Investments LLC | Enid, OK 73701-1823 | Gas Operator | Jul 2024 |
| 865 | Ancell Oil Co. | Wichita Falls, TX 76309 | Oil & Gas Operator | Dec 2018 |
| 866 | Anchor B Production, Inc. | Orla, TX 79770 | Oil & Gas Operator | Aug 2003 |
| 867 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 868 | Anchor Bay Petroleum | Hays, KS 67601 | Oil Operator | Jul 2024 |
| 869 | Anchor Bay Petroleum LLC | Hays, KS 67601 | Oil Operator | Jul 2024 |
| 870 | Anchor Oil Company | Gruver, TX 79040 | Gas Operator | Nov 2024 |
| 871 | Anchor Operating Co. | Houston, TX 77055 | Oil & Gas Operator | Nov 2024 |
| 872 | Anchorage Oil & Gas Inc | Oklahoma City, OK 73128-1422 | Oil & Gas Operator | Oct 1999 |
| 873 | Ancient Sands Inc | Kittanning, PA 16201-0916 | Oil & Gas Operator | Dec 2008 |
| 874 | Anco Account | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 1995 |
| 875 | Ancora-Verde Corporation | | Oil & Gas Operator | Dec 2004 |
| 876 | Ancova Energy Marketing LLC | Oklahoma City, OK 73103 | Oil & Gas Operator | Aug 2024 |
| 877 | Andalucia Oil Company | San Antonio, TX 78258 | Oil Operator | Nov 2024 |
| 878 | Andco Mud Inc | Edmond, OK 73034-3910 | Oil & Gas Operator | Mar 2006 |
| 879 | Andector Exploration Company | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 880 | Anderman/Smith Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1995 |
| 881 | Anderson Art Tan | | Oil Operator | Jul 1988 |
| 882 | Anderson Bobby B | Fleming, OH 45729 | Oil & Gas Operator | Dec 2023 |
| 883 | Anderson Energy Corporation | Arvada, CO 80004 | Oil & Gas Operator | Nov 2024 |
| 884 | Anderson Energy SVC LLC | Clarendon, PA 16313 | Oil & Gas Operator | Dec 2023 |
| 885 | Anderson Energy, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Apr 2024 |
| 886 | Anderson Exploration Co., Inc. | | Oil & Gas Operator | Sep 2023 |
| 887 | Anderson Floyd Melton Revocable Trust | Yukon, OK 73099 | Oil & Gas Operator | Aug 2024 |
| 888 | Anderson Jerry W | Bartlesville, OK 74006-0178 | Oil Operator | Dec 2022 |
| 889 | Anderson Kent | | Oil Operator | Dec 2009 |
| 890 | Anderson Management Company | Gillette, WY 82716 | Oil & Gas Operator | May 2016 |
| 891 | Anderson Mary L | | Oil & Gas Operator | Nov 1998 |
| 892 | Anderson Oil & Gas Account | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2013 |
| 893 | Anderson Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2015 |
| 894 | Anderson Oil Corporation | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Nov 1999 |
| 895 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Nov 2024 |
| 896 | Anderson Oil LTD.,LLP | Farmington, NM 87499 | Oil & Gas Operator | Sep 2024 |
| 897 | Anderson Operating LLC Of Mississippi | | Oil & Gas Operator | Jul 2018 |
| 898 | Anderson Petro-Equipment, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Nov 2024 |
| 899 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 900 | Anderson Production | Cisco, TX 76437 | Oil & Gas Operator | Nov 2024 |