| 1801 | C.O.W. Operating Company | Graham, TX 76450 | Oil Operator | Feb 2026 |
| 1802 | C.W. Pickering, Inc. | Victoria, TX 77904 | Gas Operator | Sep 2022 |
| 1803 | C5 Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Dec 2019 |
| 1804 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Feb 2026 |
| 1805 | Cab Resources, LLC | Odessa, TX 79762 | Oil Operator | Feb 2026 |
| 1806 | Cabal Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 1807 | Cabana Oil Corp. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2006 |
| 1808 | Cabeza Oil And Gas, LLC | Austin, CO 81410 | Oil & Gas Operator | Mar 2022 |
| 1809 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Nov 2025 |
| 1810 | Cabot Oil & Gas Production Corp. | Houston, TX 77060 | Oil & Gas Operator | Jun 1996 |
| 1811 | Cactus Gas & Oil, Inc. | San Antonio, TX 78259 | Oil & Gas Operator | Feb 2026 |
| 1812 | Cactus Jack Operating Company | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Aug 2003 |
| 1813 | Cactus Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Aug 2000 |
| 1814 | Cactus Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Feb 2026 |
| 1815 | Cada Operating, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Nov 2004 |
| 1816 | Caddell Well Service, Inc. | Prairie Lea, TX 78661 | Oil & Gas Operator | Feb 2026 |
| 1817 | Caddo Corporation | Austin, TX 78731 | Oil & Gas Operator | Feb 2026 |
| 1818 | Caddo Creek Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 1994 |
| 1819 | Caddo Management, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 1820 | Caddo Operating Inc. | Marshall, TX 75671 | Oil & Gas Operator | Feb 2026 |
| 1821 | Cadence Energy Partners, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Jun 2010 |
| 1822 | Cag Petroleum Corp. | Dallas, TX 75382 | Oil & Gas Operator | Feb 2026 |
| 1823 | Cago, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Feb 2026 |
| 1824 | Cain, L. L. & White, Wayne R. | Lubbock, TX 79407 | Oil & Gas Operator | Apr 2005 |
| 1825 | Caird Operating, LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Feb 2026 |
| 1826 | Cal Oil Company | Missouri City, TX 77459 | Oil Operator | May 2022 |
| 1827 | Cal-Mon Oil Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 1828 | Cal-T Oil Company, Incorporated | Borger, TX 79008 | Oil & Gas Operator | Feb 2008 |
| 1829 | Cal-Tex Exploration & Production Company LLC | San Antonio, TX 78228 | Oil & Gas Operator | Feb 2026 |
| 1830 | Cal-Tex Fossil, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 1831 | Cal-Tex Gas Transmission Co,Inc. | Mabank, TX 75147 | Oil & Gas Operator | Nov 1999 |
| 1832 | Cal-Tex Operating Co. | Manchaca, TX 78652 | Oil & Gas Operator | May 2020 |
| 1833 | Calame, Richard | Devine, TX 78016 | Oil Operator | Feb 2026 |
| 1834 | Caldera Operating Company LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 1835 | Caldwell Production Co. Inc. | Borger, TX 79008 | Oil & Gas Operator | Aug 2010 |
| 1836 | Caldwell, J. A. | San Antonio, TX 78223 | Oil & Gas Operator | Jun 2000 |
| 1837 | Calfas Cattle & Oil, LLC | San Antonio, TX 78205 | Oil Operator | Feb 2026 |
| 1838 | Calfas Oil, LLC | San Antonio, TX 78205 | Oil Operator | Feb 2026 |
| 1839 | Calhoun & Ellison Oil Co. | San Antonio, TX 78248 | Oil & Gas Operator | Dec 1997 |
| 1840 | Cali Crude LLC | Austin, TX 78738 | Oil Operator | Feb 2026 |
| 1841 | Calico Operating Co., Inc. | Dallas, TX 75205 | Oil & Gas Operator | Dec 2002 |
| 1842 | Caliente Oil LLC | Cedar Park, TX 78613 | Oil & Gas Operator | Feb 2026 |
| 1843 | California-T.D. And Assoc., Inc. | Yorba Linda, CA 92886 | Oil & Gas Operator | Aug 2003 |
| 1844 | Calima Energy LLC | Electra, TX 76360 | Oil Operator | Oct 2025 |
| 1845 | Calistoga Energy Reserves, LLC | Houston, TX 77063 | Oil & Gas Operator | Feb 2026 |
| 1846 | Calk Oil Company | Lytle, TX 78052 | Oil Operator | Feb 2026 |
| 1847 | Calk Operating, LLC | Lytle, TX 78052 | Oil Operator | Feb 2026 |
| 1848 | Calk, Roger D. | Lytle, TX 78052 | Oil & Gas Operator | Feb 2026 |
| 1849 | Callahan Land Company | Richardson, TX 75081 | Oil & Gas Operator | Sep 2020 |
| 1850 | Callarman, David | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 1851 | Callaway Production Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 1852 | Calley, Bob | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 1853 | Callon (Eagle Ford) LLC | Houston, TX 77042 | Oil & Gas Operator | Jun 2023 |
| 1854 | Callon (Permian) LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 1855 | Callon Offshore Production, Inc. | Natchez, MS 39121 | Oil & Gas Operator | Dec 2005 |
| 1856 | Callon Permian II, LLC | Houston, TX 77056 | Oil & Gas Operator | Jul 2024 |
| 1857 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 1858 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 1859 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 1860 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2005 |
| 1861 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | Feb 2026 |
| 1862 | Calto Operating Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2004 |
| 1863 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 1864 | Cam Company | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2004 |
| 1865 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | Feb 2026 |
| 1866 | Cambridge Production, Inc. | Amarillo, TX 79120 | Oil & Gas Operator | Nov 2020 |
| 1867 | Camco Saltwater Transport | George West, TX 78022 | Oil Operator | Feb 2015 |
| 1868 | Camco Saltwater Transport,L.L.C. | George West, TX 78022 | Oil Operator | Oct 2025 |
| 1869 | Camden Oil & Gas, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Dec 2005 |
| 1870 | Camden Reserves, Inc. | Houston, TX 77019 | Oil & Gas Operator | Mar 2011 |
| 1871 | Camden Resources, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2008 |
| 1872 | Camden Resources, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Dec 2015 |
| 1873 | Camelot Oil And Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 1874 | Cameron Engineering, Inc | Montgomery, TX 77356 | Oil & Gas Operator | Jun 2003 |
| 1875 | Cameron Exploration, Inc. | Longview, TX 75604 | Oil & Gas Operator | Feb 2026 |
| 1876 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 1877 | Camexco, Inc. | Houston, TX 77058 | Oil & Gas Operator | Feb 2026 |
| 1878 | Caminar Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Aug 2024 |
| 1879 | Camino Real Technologies Inc | Temple, TX 76502 | Oil Operator | Feb 2026 |
| 1880 | Camoil, Inc. | Columbus, TX 78934 | Oil & Gas Operator | Feb 2026 |
| 1881 | Campana Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | Feb 2026 |
| 1882 | Campbell Energy LLC | Carmi, IL 62821 | Oil Operator | Jul 2025 |
| 1883 | Campbell, George M. | Lubbock, TX 79490 | Oil & Gas Operator | Apr 2003 |
| 1884 | Campbell, T. K. | Fort Worth, TX 76118 | Oil & Gas Operator | Mar 2006 |
| 1885 | Campsey Minerals | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 1886 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Feb 2026 |
| 1887 | Can'T Complain Operating Co. | Georgetown, TX 78633 | Oil & Gas Operator | Feb 2026 |
| 1888 | Can-Tex Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Nov 2003 |
| 1889 | Canadian River Trading Co II | Katy, TX 77449 | Oil & Gas Operator | Feb 2026 |
| 1890 | Canan Mowrey Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 1891 | Canan Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 1892 | Candelero Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 1893 | Candleridge Oil, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jun 2003 |
| 1894 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | Feb 2026 |
| 1895 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | Feb 2026 |
| 1896 | Cantera Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2017 |
| 1897 | Cantrell Oil Co. | Elbert, TX 76359 | Oil & Gas Operator | Aug 2003 |
| 1898 | Cantro Exploration, Inc. | San Antonio, TX 78270 | Oil & Gas Operator | May 2000 |
| 1899 | Cantu Operating, LLC | McAllen, TX 78504 | Oil Operator | Feb 2026 |
| 1900 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |