| 901 | Berentz Drilling | | Oil Operator | Jul 1995 |
| 902 | Berentz Drilling Co., Inc. | Wichita, KS 67278 | Oil Operator | Jun 2025 |
| 903 | Berexco Inc. | Wichita, KS 67208 | Oil & Gas Operator | Oct 2009 |
| 904 | Berexco Incorpor | | Oil & Gas Operator | Dec 1996 |
| 905 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 906 | Berg Laney & Brown | Smackover, AR 71762 | Oil & Gas Operator | Jul 1995 |
| 907 | Berg Petroleum Inc | Byesville, OH 43723 | Oil & Gas Operator | Dec 1997 |
| 908 | Berg, Laney & Brown Company | Camden, AR 71701 | Oil Operator | Jan 2025 |
| 909 | Bergen Floyd | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 910 | Berger Oil Company | Edmond, OK 73013-2044 | Oil Operator | Mar 2015 |
| 911 | Bergman Arthur And VIvian | | Oil & Gas Operator | Dec 2008 |
| 912 | Bergman Oil Co., L.C. | Wichita, KS 67202 | Oil Operator | Sep 2007 |
| 913 | Bergman Oil Comp | | Oil Operator | Mar 1995 |
| 914 | Bergman Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Feb 1994 |
| 915 | Bergman, Anna F. Trust, A General Partnership | Shawnee, KS 66203 | Oil Operator | Nov 2019 |
| 916 | Bering Operating Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | May 2001 |
| 917 | Berkley Petroleum Inc. | | Oil & Gas Operator | Dec 2007 |
| 918 | Berkshire Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 919 | Berkshire Woodlawn Field, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 920 | Berky Resources | | Oil & Gas Operator | Sep 1994 |
| 921 | Bernard J & Geraldine E Burek | Union City, PA 16438-8548 | Gas Operator | Dec 2014 |
| 922 | Bernard/Hickox, Inc. | | Oil & Gas Operator | May 1998 |
| 923 | Berner, Mark A. | Darien Center, NY 14040 | Gas Operator | Dec 2024 |
| 924 | Berner, William F. | Elma, NY 14059 | Gas Operator | Dec 2024 |
| 925 | Berresford Enterprises In | Akron, OH 44311 | Oil & Gas Operator | Dec 1994 |
| 926 | Berry Energy Companies | Abilene, TX 79608 | Oil & Gas Operator | Dec 2025 |
| 927 | Berry Energy Inc*Walter | | Oil & Gas Operator | Aug 2016 |
| 928 | Berry Energy, Inc. | Clarksburg, WV 26301-2252 | Oil & Gas Operator | Dec 2021 |
| 929 | Berry James E | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1996 |
| 930 | Berry Oil Comp. | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 931 | Berry Oil Company, LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Apr 2019 |
| 932 | Berry Operating Company | Stillwater, OK 74076-0518 | Oil & Gas Operator | Dec 2016 |
| 933 | Berry Petroleum Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2014 |
| 934 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Oct 2025 |
| 935 | Berry, Gus | Okmulgee, OK 74447 | Oil & Gas Operator | Feb 1996 |
| 936 | Berry, O. H. | Midland, TX 79702 | Oil & Gas Operator | Dec 1993 |
| 937 | Berry, Richard A | Henderson, KY 42420 | Oil Operator | Dec 2023 |
| 938 | Berry, Thomas N. & Co. | Stillwater, OK 74076 | Oil & Gas Operator | Feb 2012 |
| 939 | Bert & Glen Loe | | Oil Operator | Jul 1979 |
| 940 | Bert Fields, Jr. | | Oil & Gas Operator | Nov 1986 |
| 941 | Bertram Oil Company, Inc. | Corpus Chrsti, TX 78475 | Oil & Gas Operator | Oct 1995 |
| 942 | Bertram Paul G Jr | Marietta, OH 45750 | Oil & Gas Operator | Dec 1992 |
| 943 | Bertram Resources Inc | Lexington, KY 40509 | Oil & Gas Operator | Dec 2022 |
| 944 | Bertschinger Oil Company | Oklahoma City, OK 73116-6534 | Oil & Gas Operator | Nov 2015 |
| 945 | Berwell Energy Inc | Columbus, OH 43221 | Oil & Gas Operator | Dec 1987 |
| 946 | Beryl Oil And Gas, LP | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 947 | Besco Operating, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 948 | Best John B | Franklin, PA 16323-8115 | Oil & Gas Operator | Dec 2018 |
| 949 | Best Petroleum Explorations,Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 950 | Bestmark Production Inc | Yukon, OK 73099 | Oil & Gas Operator | Mar 2011 |
| 951 | Besto Oil & Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Oct 2018 |
| 952 | Bet-Ro, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Dec 2025 |
| 953 | Beta Gas & Oil, Inc. | Tulsa, OK 74136 | Oil Operator | Jun 2001 |
| 954 | Beta Helix Energy LLC | | Oil & Gas Operator | Dec 2021 |
| 955 | Beta Oil Company Inc | Oklahoma City, OK 73157-2958 | Oil & Gas Operator | Dec 2022 |
| 956 | Beta Oil Corporation | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2025 |
| 957 | Beta Oil Inc | | Oil Operator | Feb 1986 |
| 958 | Beta Operating Company, LLC | Houston, TX 77210 | Oil & Gas Operator | Apr 2020 |
| 959 | Beta Operating, Inc | | Oil & Gas Operator | May 2001 |
| 960 | Beta-Tex, An Oklahoma Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | Aug 2024 |
| 961 | Beth Ann Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Jul 2001 |
| 962 | Bethany Camp Fellowship Of Independent Baptist | Sinclairville, NY 14782 | Gas Operator | Dec 2024 |
| 963 | Bethel Oil & Gas | | Oil & Gas Operator | Dec 2004 |
| 964 | Bethel Oil & Gas Co | Marietta, OH 45750-6710 | Oil & Gas Operator | Dec 2019 |
| 965 | Bethel Oil And Gas LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 966 | Bethlan Production Corporation | | Oil & Gas Operator | Dec 1994 |
| 967 | Betop Inc | Ojai, CA 83203 | Oil & Gas Operator | Dec 1996 |
| 968 | Bets Oil & Gas | Pawhuska, OK 74056 | Oil & Gas Operator | Nov 2018 |
| 969 | Betsy Production Company, Inc. | Magnolia, AR 71753 | Oil & Gas Operator | Sep 2025 |
| 970 | Bettis Boyle & Stovall,Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2022 |
| 971 | Bettis Brothers Inc | Graham, TX 76046 | Oil & Gas Operator | Dec 1995 |
| 972 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 973 | Betty L Wood Dba Able Oil Company | Morris, OK 74445-2303 | Oil & Gas Operator | Jul 2025 |
| 974 | Betwell Oil & Gas Company | Hialeah, FL 33002 | Oil & Gas Operator | Dec 2025 |
| 975 | Beucler Brothers Inc | Dellroy, OH 44620 | Oil & Gas Operator | Dec 2020 |
| 976 | Beusa Energy, Inc. | Spring, TX 77380 | Oil & Gas Operator | Apr 2011 |
| 977 | Beusa Energy, LLC | | Oil & Gas Operator | Nov 2017 |
| 978 | Bev Exploration, Inc. | | Oil Operator | Jun 1985 |
| 979 | Beveled Edge Productions LLC | Norman, OK 73069-4941 | Oil Operator | Dec 2019 |
| 980 | Beveridge Patricia C | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 2024 |
| 981 | Beverly Hills Oil Co. | | Oil & Gas Operator | Dec 1979 |
| 982 | Bevers SWD, Inc. | Lubbock, TX 79453 | Oil & Gas Operator | Dec 2025 |
| 983 | Bevo Production Co. | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2014 |
| 984 | Bex, Inc. | Nashville, TN 37209 | Oil & Gas Operator | Aug 2007 |
| 985 | Bexco Operating, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Dec 2025 |
| 986 | Beymer & Beymer | | Gas Operator | Dec 2009 |
| 987 | Bez Resources LLC | Perry, OK 73077-2204 | Oil & Gas Operator | Mar 2023 |
| 988 | BF Adventures LLC | Warren, PA 16365-8306 | Oil & Gas Operator | Dec 2024 |
| 989 | BFD Energy Corporation | Georgetown, TX 78628 | Gas Operator | May 1998 |
| 990 | BFP Oil Company | Frisco, TX 75034 | Oil & Gas Operator | Dec 2025 |
| 991 | BFS Petroleum Company | Skiatook, OK 74070-3998 | Oil & Gas Operator | Jan 2004 |
| 992 | BG Production, LLC | Denver, NC 28037-8088 | Oil & Gas Operator | Dec 2021 |
| 993 | BG-5, Inc. | Rantoul, KS 66079 | Oil Operator | Jun 2025 |
| 994 | Bgi Resources LLC | | Oil & Gas Operator | Aug 2025 |
| 995 | BGM Production, LLC | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 996 | BHB Oil Partners LLC | Powell, WY 82435 | Oil Operator | Oct 2025 |
| 997 | BHB Oil, Inc | | Oil & Gas Operator | Dec 2024 |
| 998 | BHB Operating Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Dec 2025 |
| 999 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 1000 | BHP Billiton Petro (KCS Resources), LLC | | Oil & Gas Operator | Jul 2019 |