| 901 | American Warrior | | Oil & Gas Operator | Dec 2023 |
| 902 | American Warrior Inc | Garden City, KS 67846 | Oil & Gas Operator | Dec 2023 |
| 903 | American Warrior, In | | Oil & Gas Operator | Dec 2023 |
| 904 | American West | Burkett, TX 76828 | Oil & Gas Operator | Apr 2024 |
| 905 | American West Resources, Inc | Fort Worth, TX 76161 | Oil & Gas Operator | Apr 2024 |
| 906 | Americana Energy Inc | Byng, OK 74820-1527 | Oil & Gas Operator | Dec 2023 |
| 907 | Americana Petroleum Corp | Waco, TX 76710 | Oil Operator | Aug 1992 |
| 908 | Americase Production Co. | Dallas, TX 75252 | Oil Operator | May 2002 |
| 909 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Apr 2024 |
| 910 | Americo Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2012 |
| 911 | Americus Resources, Inc. | | Oil & Gas Operator | Feb 1993 |
| 912 | Amerikan Oil, LLC | Mound City, KS 66056 | Oil Operator | Dec 2023 |
| 913 | Amerind Oil Co L P | Midland, TX 79701 | Oil & Gas Operator | Nov 2004 |
| 914 | Amerind Oil Company, LTD. | Midland, TX 79701 | Oil & Gas Operator | Nov 2004 |
| 915 | Ameristate Exploration LLC | Austin, TX 78701 | Oil & Gas Operator | Nov 2009 |
| 916 | Ameritech Oil & Gas Corporation | Dallas, TX 75248 | Oil & Gas Operator | May 1996 |
| 917 | Amerkan Resource | | Oil Operator | Jan 1994 |
| 918 | Amerril Energy LLC | Houston, TX 77042 | Oil & Gas Operator | Apr 2024 |
| 919 | Ames Financial, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2024 |
| 920 | Ames Oil | Cross Plains, TX 76443 | Oil & Gas Operator | Apr 2024 |
| 921 | Ames Oil And Gas | | Oil & Gas Operator | Apr 1986 |
| 922 | Ames Oil Corporation Of Texas | Austin, TX 78720 | Oil & Gas Operator | Mar 2015 |
| 923 | Ames, C B Dba Ames Oil & Gas | | Oil Operator | Dec 2004 |
| 924 | Ames, Donald A. | | Gas Operator | Dec 2022 |
| 925 | Amex Energy Consults Inc | Columbus, OH 43214 | Oil & Gas Operator | Dec 1988 |
| 926 | Amexco, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 927 | Amherst Energy Holdings, LLC | Highland VLG, TX 75077 | Oil Operator | Apr 2024 |
| 928 | Aminex USA, Inc. | Somerset, TX 78069 | Oil & Gas Operator | May 2018 |
| 929 | Aminoil Of Louisiana, Inc. | | Oil & Gas Operator | Dec 1981 |
| 930 | Aminoil USA Inc | | Oil & Gas Operator | Jan 1985 |
| 931 | Amirmex Inc. | Denver, CO 80234 | Oil & Gas Operator | Apr 2024 |
| 932 | Amistad Energy Services, LLC | Katy, TX 77450 | Oil & Gas Operator | Oct 2017 |
| 933 | Amity Oil Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1977 |
| 934 | Amkay Petroleum Co., Inc. | | Oil Operator | Dec 1991 |
| 935 | Ammonite Energy Texas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2003 |
| 936 | Amoco Energy Trading Corp | Chicago, IL 60601 | Oil & Gas Operator | Apr 2021 |
| 937 | Amoco Prod Co-Banner Pet LTD | | Oil & Gas Operator | Mar 1981 |
| 938 | Amoco Production | | Oil & Gas Operator | Jun 2012 |
| 939 | Amoco Production Co And C M S Oil And Gas | | Oil & Gas Operator | Sep 1996 |
| 940 | Amoco Production Co And Peninsular Oil And Gas Co | | Oil & Gas Operator | Sep 1998 |
| 941 | Amoco Production Co-Ratliff City | Ratliff City, OK 73081 | Oil Operator | May 1998 |
| 942 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 943 | Amoco Rocmount Company | Denver, CO 80201 | Oil & Gas Operator | Jan 1998 |
| 944 | Amos, Joe | Wichita, KS 67233 | Oil Operator | Jul 1990 |
| 945 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | Apr 2024 |
| 946 | Ample Resources Inc. | | Oil & Gas Operator | Nov 2023 |
| 947 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 948 | Amplify Oklahoma Operating LLC | | Oil & Gas Operator | Dec 2023 |
| 949 | Ampolex (Texas), Inc. | | Oil & Gas Operator | Jun 1993 |
| 950 | Ampolex Wy Inc | Gillette, WY 82716 | Oil & Gas Operator | Mar 1997 |
| 951 | Amreco, LLC | El Dorado, AR 71730 | Oil Operator | Feb 2024 |
| 952 | Amrich Energy Inc. | | Oil & Gas Operator | Dec 2022 |
| 953 | Amron Petroleum, Inc. | Midland, TX 79708 | Oil & Gas Operator | Jan 1996 |
| 954 | Ams Energy LLC | Herman, PA 16039-0156 | Oil & Gas Operator | Jan 2024 |
| 955 | Amsito Oil Company LLC | Denton, TX 76206-0689 | Oil Operator | Apr 2001 |
| 956 | Amsito Production Company LLC | | Oil & Gas Operator | Jul 2005 |
| 957 | Amsler Jerry & Denese | Enid, OK 73703-9300 | Oil & Gas Operator | Jul 2020 |
| 958 | Amt Resources, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2024 |
| 959 | Amtech Energy Inc | Plymouth, IL 62367-1016 | Oil & Gas Operator | Dec 2021 |
| 960 | Amtex Energy | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 961 | Amtex Energy, Inc. | Fort Worth, TX 76147 | Oil & Gas Operator | Apr 2024 |
| 962 | Amtex Oil & Gas Inc | Canton, OH 44711 | Oil & Gas Operator | Dec 2004 |
| 963 | Amtuck Oil | Logan, OH 43138 | Oil & Gas Operator | Dec 2010 |
| 964 | Amvest Osage Inc | Skiatook, OK 74070-0970 | Oil & Gas Operator | Dec 2023 |
| 965 | Amwes Exploration, LLC | Barbourville, KY 40906 | Oil & Gas Operator | Dec 2022 |
| 966 | Amx Energy, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Apr 2024 |
| 967 | An-Car Oil Co, Inc | Owensboro, KY 42302-1329-1329 | Oil & Gas Operator | Dec 2014 |
| 968 | An-Son Corporation | Oklahoma City, OK 73124-0060 | Oil & Gas Operator | Jan 2006 |
| 969 | An-Son Transporation | Oklahoma City, OK 73136 | Oil & Gas Operator | Nov 2006 |
| 970 | Anabaco Operating Company | Stillwater, OK 74076-1958 | Oil & Gas Operator | Mar 2014 |
| 971 | Anacapa Oil Corporation | | Gas Operator | Nov 2023 |
| 972 | Anadarko Austin Chalk Company | Houston, TX 77251 | Oil & Gas Operator | Feb 2006 |
| 973 | Anadarko Basin Oil& Gas Lease Inc | Sayre, OK 73662 | Oil & Gas Operator | Jan 1997 |
| 974 | Anadarko Disposal | El Reno, OK 73036 | Oil & Gas Operator | Jun 2014 |
| 975 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 976 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 977 | Anadarko Gathering Co. | Houston, TX 77251 | Oil & Gas Operator | Jul 2001 |
| 978 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2024 |
| 979 | Anadarko Ogc Company | Houston, TX 77251 | Oil & Gas Operator | Dec 1998 |
| 980 | Anadarko Petrole | | Oil & Gas Operator | Dec 1996 |
| 981 | Anadarko Petroleum | | Oil & Gas Operator | Oct 2007 |
| 982 | Anadarko Petroleum Co | | Oil & Gas Operator | Feb 1998 |
| 983 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jan 2024 |
| 984 | Anadarko Prod | | Oil & Gas Operator | Dec 1996 |
| 985 | Anadarko Production Co. | | Oil Operator | Feb 1989 |
| 986 | Anadarko Water Resource MGMT LLC | | Oil & Gas Operator | Jan 2024 |
| 987 | Anadime Energy Services Inc. | | Oil & Gas Operator | Dec 2009 |
| 988 | Analena Corporation | Dallas, TX 75251 | Oil Operator | Jun 2000 |
| 989 | Ananda Energy Inc. | Pampa, TX 79065 | Oil & Gas Operator | Jan 2021 |
| 990 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 991 | Anatexas Offshore, Inc. | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 992 | Anathema, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Dec 1994 |
| 993 | Anc Investments LLC | Enid, OK 73701-1823 | Gas Operator | Dec 2023 |
| 994 | Ancell Oil Co. | Wichita Falls, TX 76309 | Oil & Gas Operator | Dec 2018 |
| 995 | Anchor B Production, Inc. | Orla, TX 79770 | Oil & Gas Operator | Aug 2003 |
| 996 | Anchor Bay Corporation | Denver, CO 80202 | Oil & Gas Operator | Jun 2007 |
| 997 | Anchor Bay Petroleum | Hays, KS 67601 | Oil Operator | Dec 2023 |
| 998 | Anchor Bay Petroleum LLC | Hays, KS 67601 | Oil Operator | Dec 2023 |
| 999 | Anchor Oil Company | Gruver, TX 79040 | Gas Operator | Apr 2024 |
| 1000 | Anchor Operating Co. | Houston, TX 77055 | Oil & Gas Operator | Apr 2024 |