| 1801 | Caldera Operating Company LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 1802 | Caldwell Production Co. Inc. | Borger, TX 79008 | Oil & Gas Operator | Aug 2010 |
| 1803 | Caldwell, J. A. | San Antonio, TX 78223 | Oil & Gas Operator | Jun 2000 |
| 1804 | Calfas Cattle & Oil, LLC | San Antonio, TX 78205 | Oil Operator | Dec 2025 |
| 1805 | Calfas Oil, LLC | San Antonio, TX 78205 | Oil Operator | Dec 2025 |
| 1806 | Calhoun & Ellison Oil Co. | San Antonio, TX 78248 | Oil & Gas Operator | Dec 1997 |
| 1807 | Cali Crude LLC | Austin, TX 78738 | Oil Operator | Dec 2025 |
| 1808 | Calico Operating Co., Inc. | Dallas, TX 75205 | Oil & Gas Operator | Dec 2002 |
| 1809 | Caliente Oil LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Dec 2025 |
| 1810 | Calima Energy LLC | Electra, TX 76360 | Oil Operator | Dec 2025 |
| 1811 | Calistoga Energy Reserves, LLC | Houston, TX 77063 | Oil & Gas Operator | Dec 2025 |
| 1812 | Calk Oil Company | Lytle, TX 78052 | Oil Operator | Dec 2025 |
| 1813 | Calk Operating, LLC | Lytle, TX 78052 | Oil Operator | Dec 2025 |
| 1814 | Calk, Roger D. | Lytle, TX 78052 | Oil & Gas Operator | Dec 2025 |
| 1815 | Callahan Land Company | Richardson, TX 75081 | Oil & Gas Operator | Sep 2020 |
| 1816 | Callarman, David | Cisco, TX 76437 | Oil & Gas Operator | Dec 2025 |
| 1817 | Callaway Production Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 1818 | Calley, Bob | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 1819 | Callon (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2023 |
| 1820 | Callon (Permian) LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 1821 | Callon Offshore Production, Inc. | Natchez, MS 39121 | Oil & Gas Operator | Dec 2005 |
| 1822 | Callon Permian II, LLC | Houston, TX 77056 | Oil & Gas Operator | Jul 2024 |
| 1823 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 1824 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 1825 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 1826 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2005 |
| 1827 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | Dec 2025 |
| 1828 | Calto Operating Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2004 |
| 1829 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 1830 | Cam Company | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2004 |
| 1831 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | Dec 2025 |
| 1832 | Cambridge Production, Inc. | Amarillo, TX 79120 | Oil & Gas Operator | Nov 2020 |
| 1833 | Camco Saltwater Transport | George West, TX 78022 | Oil Operator | Feb 2015 |
| 1834 | Camco Saltwater Transport,L.L.C. | George West, TX 78022 | Oil Operator | Dec 2025 |
| 1835 | Camden Oil & Gas, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Dec 2005 |
| 1836 | Camden Reserves, Inc. | Houston, TX 77019 | Oil & Gas Operator | Mar 2011 |
| 1837 | Camden Resources, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2008 |
| 1838 | Camden Resources, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Dec 2015 |
| 1839 | Camelot Oil And Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 1840 | Cameron Engineering, Inc | Montgomery, TX 77356 | Oil & Gas Operator | Jun 2003 |
| 1841 | Cameron Exploration, Inc. | Longview, TX 75604 | Oil & Gas Operator | Dec 2025 |
| 1842 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 1843 | Camexco, Inc. | Houston, TX 77058 | Oil & Gas Operator | Dec 2025 |
| 1844 | Caminar Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Aug 2024 |
| 1845 | Camino Real Technologies Inc | Temple, TX 76502 | Oil Operator | Dec 2025 |
| 1846 | Camoil, Inc. | Columbus, TX 78934 | Oil & Gas Operator | Dec 2025 |
| 1847 | Campana Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 1848 | Campbell Energy LLC | Carmi, IL 62821 | Oil Operator | Jun 2025 |
| 1849 | Campbell, George M. | Lubbock, TX 79490 | Oil & Gas Operator | Apr 2003 |
| 1850 | Campbell, T. K. | Fort Worth, TX 76118 | Oil & Gas Operator | Mar 2006 |
| 1851 | Campsey Minerals | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 1852 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Dec 2025 |
| 1853 | Can'T Complain Operating Co. | Georgetown, TX 78633 | Oil & Gas Operator | Dec 2025 |
| 1854 | Can-Tex Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Nov 2003 |
| 1855 | Canadian River Trading Co II | Katy, TX 77449 | Oil & Gas Operator | Dec 2025 |
| 1856 | Canan Mowrey Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 1857 | Canan Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 1858 | Candelero Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 1859 | Candleridge Oil, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jun 2003 |
| 1860 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2025 |
| 1861 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | Dec 2025 |
| 1862 | Cantera Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2017 |
| 1863 | Cantrell Oil Co. | Elbert, TX 76359 | Oil & Gas Operator | Aug 2003 |
| 1864 | Cantro Exploration, Inc. | San Antonio, TX 78270 | Oil & Gas Operator | May 2000 |
| 1865 | Cantu Operating, LLC | McAllen, TX 78504 | Oil Operator | Dec 2025 |
| 1866 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Oct 2025 |
| 1867 | Canyon Co., The | Midland, TX 79708 | Gas Operator | Aug 1994 |
| 1868 | Canyon Creek Energy Texas, LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2017 |
| 1869 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 1870 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Oct 2025 |
| 1871 | Canyon Oil & Gas Exploration LLC | San Antonio, TX 78258 | Oil & Gas Operator | May 2002 |
| 1872 | Canyon Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 1873 | Canyon Operating Unit | San Angelo, TX 76904 | Oil & Gas Operator | Sep 1995 |
| 1874 | Canyon Reef Brine LLC | Snyder, TX 79550 | Oil Operator | Dec 2025 |
| 1875 | Canyon Ridge Energy LLC | Iowa Park, TX 76367 | Oil Operator | Nov 2024 |
| 1876 | Cap Operating Inc. | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 1877 | Capataz Operating Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2020 |
| 1878 | Capco Offshore Of Texas, Inc. | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 1879 | Capco Offshore, Inc. | Irving, TX 75063 | Oil & Gas Operator | May 2012 |
| 1880 | Capco Resources Corporation | Irving, TX 75016 | Oil & Gas Operator | Mar 2004 |
| 1881 | Capco Resources Of Texas, Inc | Irving, TX 75063 | Oil & Gas Operator | Jun 2003 |
| 1882 | Cape Operating, Inc. | Longview, TX 75608 | Oil & Gas Operator | Nov 2007 |
| 1883 | Cape, Randy | Tyler, TX 75703 | Oil & Gas Operator | Mar 2008 |
| 1884 | Capio Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2015 |
| 1885 | Capital A Corp. | San Antonio, TX 78279 | Oil & Gas Operator | Jun 2002 |
| 1886 | Capital Resource Management Inc | Austin, TX 78716 | Oil & Gas Operator | May 1999 |
| 1887 | Capital Star Oil & Gas, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2025 |
| 1888 | Capitan Energy, Incorporated | Carlsbad, NM 88221 | Oil & Gas Operator | Dec 2025 |
| 1889 | Capitol Operating & Expl., Inc. | Austin, TX 78766 | Oil & Gas Operator | Feb 2001 |
| 1890 | Capitol Well Servicing Co., Inc. | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2023 |
| 1891 | Capps, R. Oil Corp. | Midland, TX 79704 | Oil & Gas Operator | Oct 2002 |
| 1892 | Caprock Energy, Inc. | Denton, TX 76205 | Oil & Gas Operator | Apr 1993 |
| 1893 | Caprock Engineering, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2018 |
| 1894 | Caprock Exploration, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Dec 2025 |
| 1895 | Caprock Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Dec 2007 |
| 1896 | Caprock, Inc. | Ralls, TX 79357 | Oil & Gas Operator | Mar 2013 |
| 1897 | Capstone Cactus Operating Comp. | Hennessey, OK 73742 | Oil & Gas Operator | Dec 2025 |
| 1898 | Capstone Natural Res II, LLC | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2020 |
| 1899 | Capstone Natural Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2015 |
| 1900 | Capturepoint LLC | Allen, TX 75013 | Oil & Gas Operator | Dec 2025 |