| 1901 | Brammer-Keystone Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 1902 | Bramwell Petrole | | Oil & Gas Operator | Dec 1995 |
| 1903 | Bramwell Petroleum, Inc. | Zenda, KS 67159 | Oil & Gas Operator | Dec 2024 |
| 1904 | Brana Corp | Albuquerque, NM 87102 | Gas Operator | Nov 1994 |
| 1905 | Branch Investment Corporation | | Oil & Gas Operator | Jan 2025 |
| 1906 | Branch John D | Warren, PA 16365-8356 | Oil & Gas Operator | Dec 2023 |
| 1907 | Branch Oil & Gas | Shelby, MT 59474-0766 | Oil & Gas Operator | Jul 2010 |
| 1908 | Branch Production | | Oil Operator | Dec 2017 |
| 1909 | Branch Productions | Graham, TX 76450 | Oil & Gas Operator | May 2019 |
| 1910 | Branch, Jerry L. | | Oil & Gas Operator | Jul 1999 |
| 1911 | Brand Oil & Gas Inc | Oklahoma City, OK 73165-8911 | Oil & Gas Operator | May 2013 |
| 1912 | Brandenburg R P | Oklahoma City, OK 73139 | Oil & Gas Operator | Jun 2006 |
| 1913 | Brander, Sam H. | San Antonio, TX 78264 | Oil & Gas Operator | Apr 2025 |
| 1914 | Brandes Petroleum, B.P.C.,Inc. | Dallas, TX 75240 | Oil & Gas Operator | Apr 2025 |
| 1915 | Brandie Oil, LLC | Nowata, OK 74048 | Oil Operator | Feb 2025 |
| 1916 | Brandli Oil Inc | | Oil Operator | Jan 2025 |
| 1917 | Brandly Oilman Consultants Inc | | Oil & Gas Operator | Mar 2006 |
| 1918 | Brandon Energy, Inc. | Bullard, TX 75757 | Oil & Gas Operator | Nov 2007 |
| 1919 | Brandon Oil Company | Sunburst, MT 59482 | Oil & Gas Operator | Feb 2023 |
| 1920 | Brandt Prod Comp | | Oil & Gas Operator | Sep 1994 |
| 1921 | Brandt Production Company, Inc. | Wichita, KS 67230 | Oil Operator | Jan 2003 |
| 1922 | Brandt, Bodie | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2025 |
| 1923 | Brange | | Oil & Gas Operator | Oct 2009 |
| 1924 | Brangus Energy LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 1925 | Branham Oil & Gas | Nowata, OK 74048-9630 | Oil & Gas Operator | Oct 2020 |
| 1926 | Branney Operating Co Inc | Uniontown, OH 44685 | Oil & Gas Operator | Dec 1995 |
| 1927 | Brannon Oil & Gas Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2013 |
| 1928 | Branson Production Company | Oklahoma City, OK 73123-1323 | Oil & Gas Operator | Aug 2002 |
| 1929 | Branstetter Olin R | Ponca City, OK 74601-3432 | Oil Operator | Jul 2001 |
| 1930 | Brant Energy, LLC | Rantoul, KS 66079 | Oil Operator | Apr 2022 |
| 1931 | Branta Production Company LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2025 |
| 1932 | Brasel R Gene | Middleport, OH 45760 | Oil & Gas Operator | Dec 2015 |
| 1933 | Brashear Production Service, Inc | Longview, TX 75602 | Oil & Gas Operator | Mar 2008 |
| 1934 | Brask-Dumont Ranch, Inc. | Houston, TX 77255 | Oil & Gas Operator | Apr 2025 |
| 1935 | Brass Oil | | Oil Operator | Oct 2024 |
| 1936 | Brasseaux Oil Company | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2008 |
| 1937 | Bratco Inc | Dewey, OK 74029-0279 | Oil & Gas Operator | Jan 2025 |
| 1938 | Bratco Operating Company Inc | Dewey, OK 74029 | Oil & Gas Operator | Feb 2025 |
| 1939 | Bratton Energy | Danville, OH 43014 | Oil & Gas Operator | Dec 2023 |
| 1940 | Braun, John | Victoria, KS 67671 | Oil Operator | Oct 2024 |
| 1941 | Bravo Arkoma LLC | Tulsa, OK 74103-3100 | Oil & Gas Operator | Nov 2024 |
| 1942 | Bravo Natural Gas, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2012 |
| 1943 | Bravo Natural Resources, Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2009 |
| 1944 | Bravo Operating Company | Hobbs, NM 88241 | Oil & Gas Operator | Dec 1995 |
| 1945 | Brawand H William | Wilcox, PA 15870-0373 | Oil & Gas Operator | Dec 2024 |
| 1946 | Brawley Petroleum Corporation | Lubbock, TX 79424 | Gas Operator | Aug 2017 |
| 1947 | Braxton Oil And Gas Corp. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2021 |
| 1948 | Bray Drilling Co., Inc. | | Oil Operator | Feb 1982 |
| 1949 | Bray-Conn Resources, LLC | Wichita Falls, TX 76307 | Oil Operator | Dec 2011 |
| 1950 | Brayton Oil Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Dec 1994 |
| 1951 | Brayton Operating Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Sep 2009 |
| 1952 | Brayton-Hodges Petroleum Inc. | | Oil & Gas Operator | Dec 2024 |
| 1953 | Brazos Geological Consulting LT | College Sta, TX 77840 | Oil Operator | Apr 2025 |
| 1954 | Brazos Oil Co. | Corpus Chrsti, TX 78418 | Oil & Gas Operator | Feb 2008 |
| 1955 | Brazos Operating LLC | Midland, TX 79710 | Gas Operator | Apr 2025 |
| 1956 | Brazos Petroleum | | Oil & Gas Operator | Aug 1995 |
| 1957 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 1958 | Brazos Resources, Inc. | College Sta, TX 77840 | Oil & Gas Operator | Dec 1998 |
| 1959 | Brazos River Exploration LLC | Houston, TX 77008 | Oil & Gas Operator | Oct 2024 |
| 1960 | Brazos River LLC | | Oil & Gas Operator | Apr 2002 |
| 1961 | Brazos Valley Operating, LLC | Austin, TX 78738 | Oil & Gas Operator | Apr 2025 |
| 1962 | Brbco, LLC | | Oil & Gas Operator | Dec 2024 |
| 1963 | BRC Operating Company LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 1964 | Brchan Ventures LLC | Bartlesville, OK 74006-0281 | Oil Operator | Dec 2021 |
| 1965 | Brea Canon Oil Co. | | Oil & Gas Operator | Dec 2024 |
| 1966 | Brea Oil Company Inc. | | Oil & Gas Operator | Oct 2001 |
| 1967 | Breakthrough Ventures, LLC | | Oil Operator | Jan 2025 |
| 1968 | Brecca Oil & Gas Operators, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Mar 2003 |
| 1969 | Brecheisen & Lor | | Oil & Gas Operator | Oct 1995 |
| 1970 | Brecheisen & Spooner | Garnett, KS 66032 | Gas Operator | Aug 2009 |
| 1971 | Brecheisen Oil C | | Oil & Gas Operator | Sep 1993 |
| 1972 | Brechtel Energy Corporation | | Oil & Gas Operator | Sep 2008 |
| 1973 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2025 |
| 1974 | Breckenridge Corporation | Buckhannon, WV 26201-0000 | Oil & Gas Operator | Dec 2021 |
| 1975 | Breeden Oil | Albany, TX 76430 | Oil & Gas Operator | Apr 2002 |
| 1976 | Breeze Oil, LLC | Nocona, TX 76255 | Oil Operator | Apr 2025 |
| 1977 | Breeze Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1993 |
| 1978 | Breeze, James R. | Nocona, TX 76255 | Oil & Gas Operator | Nov 2017 |
| 1979 | Brehm Asset Management, LLC | Frisco, TX 75035 | Oil Operator | Dec 2024 |
| 1980 | Brehm Exploration, Inc. | | Oil & Gas Operator | Mar 1995 |
| 1981 | Brehm Investment Group Inc | | Oil Operator | Jul 1991 |
| 1982 | Brehm Oil | MT. Vernon, IL 62864 | Oil Operator | Jan 1986 |
| 1983 | Breitburn | | Oil & Gas Operator | Sep 2024 |
| 1984 | Breitburn Energy Company LLC | Lakewood, CO 80227 | Oil Operator | Aug 2011 |
| 1985 | Breitburn Florida, LLC | | Oil & Gas Operator | Dec 2024 |
| 1986 | Breitburn Operating Limited Partnership | | Oil & Gas Operator | Aug 2022 |
| 1987 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 1988 | Breitenbach Family Farms LLC | Bonner Springs, KS 66012 | Oil & Gas Operator | May 2020 |
| 1989 | Breitling Operating Corporation | Dallas, TX 75201 | Oil & Gas Operator | Aug 2016 |
| 1990 | Breland, Leon | | Oil & Gas Operator | Feb 1991 |
| 1991 | Brenda Oil And Gas Company | Pleasant PLNS, AR 72568 | Oil & Gas Operator | May 2006 |
| 1992 | Brenham Drilling Co. | Flatonia, TX 78941 | Oil & Gas Operator | Apr 2025 |
| 1993 | Brennco Gas Transmission, Inc. | Overland Park, KS 66282 | Gas Operator | Apr 2009 |
| 1994 | Brenneis Energy | Duncan, OK 73533-5415 | Oil & Gas Operator | Feb 2025 |
| 1995 | Brenneis Oil Company | Norman, OK 73072-3963 | Oil & Gas Operator | Aug 2012 |
| 1996 | Brent Baker Oil And Gas Inc | Oklahoma City, OK 73149-2932 | Oil & Gas Operator | Feb 2025 |
| 1997 | Brent Boggs Oil & Gas LLC | Ivydale, WV 25113 | Oil & Gas Operator | Nov 2021 |
| 1998 | Brent Exploration | | Oil & Gas Operator | Dec 1993 |
| 1999 | Brent Exploration Inc. | | Oil & Gas Operator | Apr 1983 |
| 2000 | Bretagne, G P | Beattyville, KY 41311 | Oil & Gas Operator | Dec 2023 |