| 1901 | Canyon Co., The | Midland, TX 79708 | Gas Operator | Aug 1994 |
| 1902 | Canyon Creek Energy Texas, LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2017 |
| 1903 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 1904 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Oct 2025 |
| 1905 | Canyon Oil & Gas Exploration LLC | San Antonio, TX 78258 | Oil & Gas Operator | May 2002 |
| 1906 | Canyon Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 1907 | Canyon Operating Unit | San Angelo, TX 76904 | Oil & Gas Operator | Sep 1995 |
| 1908 | Canyon Reef Brine LLC | Snyder, TX 79550 | Oil Operator | Feb 2026 |
| 1909 | Canyon Ridge Energy LLC | Iowa Park, TX 76367 | Oil Operator | Nov 2024 |
| 1910 | Cap Operating Inc. | Borger, TX 79008 | Oil & Gas Operator | Feb 2026 |
| 1911 | Capataz Operating Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2020 |
| 1912 | Capco Offshore Of Texas, Inc. | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 1913 | Capco Offshore, Inc. | Irving, TX 75063 | Oil & Gas Operator | May 2012 |
| 1914 | Capco Resources Corporation | Irving, TX 75016 | Oil & Gas Operator | Mar 2004 |
| 1915 | Capco Resources Of Texas, Inc | Irving, TX 75063 | Oil & Gas Operator | Jun 2003 |
| 1916 | Cape Operating, Inc. | Longview, TX 75608 | Oil & Gas Operator | Nov 2007 |
| 1917 | Cape, Randy | Tyler, TX 75703 | Oil & Gas Operator | Mar 2008 |
| 1918 | Capio Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2015 |
| 1919 | Capital A Corp. | San Antonio, TX 78279 | Oil & Gas Operator | Jun 2002 |
| 1920 | Capital Resource Management Inc | Austin, TX 78716 | Oil & Gas Operator | May 1999 |
| 1921 | Capital Star Oil & Gas, Inc. | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 1922 | Capitan Energy, Incorporated | Carlsbad, NM 88221 | Oil & Gas Operator | Feb 2026 |
| 1923 | Capitol Operating & Expl., Inc. | Austin, TX 78766 | Oil & Gas Operator | Feb 2001 |
| 1924 | Capitol Well Servicing Co., Inc. | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2023 |
| 1925 | Capps, R. Oil Corp. | Midland, TX 79704 | Oil & Gas Operator | Oct 2002 |
| 1926 | Caprock Energy, Inc. | Denton, TX 76205 | Oil & Gas Operator | Apr 1993 |
| 1927 | Caprock Engineering, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2018 |
| 1928 | Caprock Exploration, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Feb 2026 |
| 1929 | Caprock Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Dec 2007 |
| 1930 | Caprock, Inc. | Ralls, TX 79357 | Oil & Gas Operator | Mar 2013 |
| 1931 | Capstone Cactus Operating Comp. | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2026 |
| 1932 | Capstone Natural Res II, LLC | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2020 |
| 1933 | Capstone Natural Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2015 |
| 1934 | Capturepoint LLC | Allen, TX 75013 | Oil & Gas Operator | Feb 2026 |
| 1935 | Caraway Operating Co. | San Angelo, TX 76902 | Oil & Gas Operator | Feb 2026 |
| 1936 | Caraway, Robert | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 1937 | Caraway, Robert R. | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 1938 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | Dec 2025 |
| 1939 | Carbon Field Energy, L.L.C. | Kilgore, TX 75663 | Oil Operator | Apr 2019 |
| 1940 | Carbon Oil Inc | Vidor, TX 77670 | Oil & Gas Operator | Feb 2026 |
| 1941 | Carburante Exploration Co, LTD. | Granbury, TX 76048 | Oil & Gas Operator | Feb 2026 |
| 1942 | Card Operating Company, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Dec 1995 |
| 1943 | Cardinal Energy Company | Rowlett, TX 75088 | Oil & Gas Operator | Feb 2026 |
| 1944 | Cardinal Operating Corporation | Waxahachie, TX 75165 | Oil & Gas Operator | Jan 1997 |
| 1945 | Cardinal Producing Co. | Abilene, TX 79606 | Oil & Gas Operator | Aug 2003 |
| 1946 | Cardinal Shares, Inc. | West Bloomfld, MI 48322 | Oil & Gas Operator | Mar 2004 |
| 1947 | Cardwell Oil Corporation | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 1948 | Cardwell'S U Bar Oil | Manor, TX 78653 | Oil & Gas Operator | Feb 2026 |
| 1949 | Carey, Shirley L. Trust | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 1950 | Caribbean Energy LLC II | Cotulla, TX 78014 | Oil & Gas Operator | Feb 2026 |
| 1951 | Caribbean Energy, L.L.C. | Cotulla, TX 78014 | Oil & Gas Operator | Nov 2019 |
| 1952 | Caribe Production Corporation | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 1993 |
| 1953 | Caribou Operating Co. | Granbury, TX 76048 | Oil & Gas Operator | Mar 2010 |
| 1954 | Caribou Operating, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Feb 2026 |
| 1955 | Carken LLC | Andrews, TX 79714 | Oil Operator | Feb 2026 |
| 1956 | Carl Oil & Gas Co. | Bakersfield, CA 93309 | Oil & Gas Operator | Dec 1995 |
| 1957 | Carlon Oil & Gas Co Inc | Derby, KS 67037 | Gas Operator | Dec 2025 |
| 1958 | Carloran Production Corp | Windthorst, TX 76389 | Oil & Gas Operator | Feb 2026 |
| 1959 | Carlow Corp. | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 1960 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 1961 | Carlton, Wayne Inc. | Bronte, TX 76933 | Oil & Gas Operator | Dec 2002 |
| 1962 | Caroil, LLC | Odessa, TX 79761 | Oil Operator | Feb 2026 |
| 1963 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Dec 2025 |
| 1964 | Carotex Energy, Inc. | Wilson, NC 27893 | Oil & Gas Operator | Aug 2003 |
| 1965 | Carpco Efficient Energy Co., LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 1966 | Carpenter Corporation | Sourlake, TX 77659 | Oil & Gas Operator | Oct 1994 |
| 1967 | Carpenter Services | Colorado City, TX 79512 | Oil & Gas Operator | May 1996 |
| 1968 | Carr Exploration Corp. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 1969 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2026 |
| 1970 | Carr Well Service Inc | Odessa, TX 79769 | Oil & Gas Operator | Nov 1996 |
| 1971 | Carrizo (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 1972 | Carrizo (Permian) LLC | Houston, TX 77042 | Oil & Gas Operator | Jan 2020 |
| 1973 | Carrizo Exploration, Inc. | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2016 |
| 1974 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 1975 | Carrland Oil & Gas Inc. | Prosper, TX 75078 | Oil & Gas Operator | Feb 2026 |
| 1976 | Carroll Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2022 |
| 1977 | Carroll, Alvis J. | Wichita Falls, TX 76302 | Oil & Gas Operator | Mar 2008 |
| 1978 | Carruth Oil & Gas, LLC | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 1979 | Carruth, Chris | Andrews, TX 79714 | Oil & Gas Operator | Nov 2017 |
| 1980 | Carson Buckles Exploration LLC | Amarillo, TX 79159 | Oil & Gas Operator | Feb 2026 |
| 1981 | Carter Cattle & Crude Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2026 |
| 1982 | Carter E&P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Dec 2016 |
| 1983 | Carter Energy Corporation | Duncanville, TX 75138 | Oil & Gas Operator | Sep 2010 |
| 1984 | Carter Exploration Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 1985 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 1986 | Carter, Gertrude (Trudy) | Rockwall, TX 75032 | Oil & Gas Operator | Apr 2013 |
| 1987 | Carter, Mattye Family Trust | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2002 |
| 1988 | Carter, Mattye L., Estate Of | Gladewater, TX 75647 | Oil & Gas Operator | Feb 1995 |
| 1989 | Carter, Shirley Oil Co | Round Rock, TX 78665 | Oil & Gas Operator | Jun 2018 |
| 1990 | Carter, Thomas J. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1995 |
| 1991 | Carter-Langham, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 1992 | Cartex Production | Pampa, TX 79066 | Oil & Gas Operator | Feb 2026 |
| 1993 | Cartex Production Corp. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 1994 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 1995 | Cary Oil & Gas, Inc | Decatur, TX 76234 | Oil & Gas Operator | Feb 2026 |
| 1996 | Casa Oil And Gas Company | George West, TX 78022 | Gas Operator | Sep 2005 |
| 1997 | Casa Operations | Borger, TX 79007 | Oil & Gas Operator | Feb 2026 |
| 1998 | Casador Oil & Gas Co. | Keller, TX 76248 | Gas Operator | Aug 2003 |
| 1999 | Cascade Petroleum Corporation | Quitman, TX 75783 | Oil & Gas Operator | Mar 2002 |
| 2000 | Cascade Resources LLC | Edmond, OK 73083 | Oil & Gas Operator | Dec 2025 |