| 801 | Cayman Resources Corporation | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 802 | Caza Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 803 | CB Oil Company | Drumright, OK 74030 | Oil & Gas Operator | Dec 2025 |
| 804 | Cecil Brand | | Oil & Gas Operator | Mar 2002 |
| 805 | Cedar Creek Consulting Inc | | Oil Operator | Jan 2025 |
| 806 | Cedyco Corporation | Houston, TX 77227 | Oil & Gas Operator | Nov 2008 |
| 807 | Cei Production Company | Dallas, TX 75225 | Oil & Gas Operator | Sep 1998 |
| 808 | Ceka Gas, Div Of GTC | | Oil & Gas Operator | May 1988 |
| 809 | Cel Properties LLC | | Oil & Gas Operator | Jan 2025 |
| 810 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 811 | Celt Oil, Inc. | | Oil & Gas Operator | Jun 1986 |
| 812 | Cenco, Inc. | | Oil & Gas Operator | Mar 2022 |
| 813 | Cenergy Exploration Company | Dallas, TX 75231 | Oil & Gas Operator | Sep 2000 |
| 814 | Cenla Oil Company, LLC | | Oil Operator | Dec 2024 |
| 815 | Centennial Exploration, Inc. | | Oil & Gas Operator | Dec 1985 |
| 816 | Centergate Resources LLC | | Oil & Gas Operator | Dec 2024 |
| 817 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 818 | Central Crude, Inc. | | Oil & Gas Operator | Jul 2014 |
| 819 | Central Min Oper Co, Inc. | | Gas Operator | Mar 1994 |
| 820 | Central Mineral Management Inc | | Oil & Gas Operator | Jul 1990 |
| 821 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 822 | Centura Inc | | Oil & Gas Operator | Feb 1985 |
| 823 | Centurion Exploration Company | Houston, TX 77042 | Oil & Gas Operator | May 2009 |
| 824 | Century Energy, Inc. | | Oil & Gas Operator | Aug 1989 |
| 825 | Century Exploration Company | | Oil & Gas Operator | Dec 2003 |
| 826 | Century Exploration Houston, Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2011 |
| 827 | Century Exploration Houston, LLC | Austin, TX 78702 | Oil & Gas Operator | Jan 2016 |
| 828 | Century Exploration N.O. LLC | | Oil & Gas Operator | Jun 2017 |
| 829 | Century Exploration N.O., Inc. | | Oil & Gas Operator | Sep 2011 |
| 830 | Century Mineral Corporation | | Oil & Gas Operator | Dec 1990 |
| 831 | Century Offshore MGMT. Corp. | | Oil & Gas Operator | Dec 1999 |
| 832 | Century Oil, Inc. | | Oil Operator | Apr 2022 |
| 833 | Cerro Oil Co., Inc. | | Oil Operator | Dec 1987 |
| 834 | Chadco, Inc. | | Oil Operator | Dec 2024 |
| 835 | Chain Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 836 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 837 | Chambers Exploration Inc. | | Oil & Gas Operator | Dec 1986 |
| 838 | Champ Operating Company | Dallas, TX 75208 | Oil & Gas Operator | Oct 2020 |
| 839 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 840 | Channel Exploration Company | | Oil & Gas Operator | Feb 1997 |
| 841 | Chanse Energy Corporation | Shreveport, LA 71165-1572 | Oil & Gas Operator | Sep 2021 |
| 842 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 843 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2026 |
| 844 | Chaparral Expl & C L Morris In | | Oil & Gas Operator | Nov 1994 |
| 845 | Chaparral Exploration, Inc. | | Oil & Gas Operator | Jun 2000 |
| 846 | Chaparral Operating, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Feb 2026 |
| 847 | Charing Cross Properties | | Oil Operator | Aug 1995 |
| 848 | Charles A. O'Niell, Jr. | | Oil & Gas Operator | Apr 2001 |
| 849 | Charles B. Bice | | Oil & Gas Operator | Jul 1983 |
| 850 | Charles E. Mayfield | | Oil & Gas Operator | Mar 2001 |
| 851 | Charles F. Word & Associates | | Oil Operator | Dec 1978 |
| 852 | Charles G. Dannelly | | Oil & Gas Operator | Mar 1998 |
| 853 | Charles Holston, Inc. | | Oil Operator | Jan 2025 |
| 854 | Charles Holston, Inc. Dba GTTS | | Oil Operator | Apr 2009 |
| 855 | Charles M. Nolan | | Oil Operator | Aug 1984 |
| 856 | Charles Reeves, Jr., Inc. | | Oil & Gas Operator | Mar 1990 |
| 857 | Charles Spencer | | Gas Operator | Jul 2011 |
| 858 | Charleston Oil & Gas, Inc. | | Oil & Gas Operator | Mar 1997 |
| 859 | Charlie G. James | | Gas Operator | Jul 1989 |
| 860 | Chateau Oil And Gas, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2017 |
| 861 | CHC Energy, LLC | | Gas Operator | Nov 2012 |
| 862 | Cheniere Petroleum Corporation | | Oil & Gas Operator | Feb 1989 |
| 863 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2026 |
| 864 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 865 | Chester Floyd | | Oil Operator | Feb 1996 |
| 866 | Chestnut Exploration And Production, Inc | Richardson, TX 75081 | Oil & Gas Operator | Nov 2020 |
| 867 | Chestnut Petroleum, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Nov 2011 |
| 868 | Chevron Pipe Line Company | Houston, TX 77001 | Oil Operator | Feb 2015 |
| 869 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 870 | Chiles Oil Field Supply | | Oil & Gas Operator | Jan 2025 |
| 871 | Chinn Exploration Company | Longview, TX 75605 | Oil & Gas Operator | Nov 2015 |
| 872 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | Feb 2026 |
| 873 | Cholla Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jan 1997 |
| 874 | Christeve Oil Company, Inc. | Houston, TX 77068 | Oil & Gas Operator | Dec 2022 |
| 875 | Christopher Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2015 |
| 876 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 877 | Churchill Energy, Inc. | | Oil & Gas Operator | Aug 2020 |
| 878 | Cibco Resources, LLC | | Oil & Gas Operator | Nov 2024 |
| 879 | Cibolo Energy Operating, Inc. | Bulverde, TX 78163 | Oil & Gas Operator | Feb 2026 |
| 880 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 881 | Ciera Resources, Inc. | | Gas Operator | Nov 1998 |
| 882 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 883 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 884 | Cimic Energy, LLC | | Oil Operator | Jan 2025 |
| 885 | Cinder Production Company | | Oil & Gas Operator | Apr 2014 |
| 886 | Cisco Petroleum, Inc. | | Oil & Gas Operator | Oct 2010 |
| 887 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Feb 2026 |
| 888 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 889 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 890 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 891 | Cits BK & Trust Of Springhill | | Oil & Gas Operator | Jun 1990 |
| 892 | Civego, Inc. | | Oil & Gas Operator | Jul 1994 |
| 893 | Clarence F. Routon, Jr. | | Oil Operator | Apr 1990 |
| 894 | Clarence Kenyon | | Gas Operator | Jul 1977 |
| 895 | Clark Oil Producing Company | | Oil & Gas Operator | Oct 1979 |
| 896 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | Feb 2026 |
| 897 | Classic Hydrocarbons, Inc. | | Gas Operator | Dec 2007 |
| 898 | Classic Oil & Gas, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jan 2004 |
| 899 | Claude Debeaux, Jr. Et Al | | Oil Operator | Dec 1999 |
| 900 | Claude S. Hinds | | Oil Operator | Aug 1985 |