| 901 | C E Harmon Oil Inc | Tulsa, OK 74136-6559 | Oil & Gas Operator | Jan 2026 |
| 902 | C E L Inc | Bartlesville, OK 74006 | Oil & Gas Operator | Jan 2020 |
| 903 | C F & L Producing Co | | Oil & Gas Operator | Sep 2000 |
| 904 | C H E Company Inc | Shawnee, OK 74801 | Oil Operator | Feb 2012 |
| 905 | C L & S Oil Company Inc | Perry, OK 73077-0841 | Oil & Gas Operator | Jan 2018 |
| 906 | C L Conner | Humble, TX 77338 | Oil & Gas Operator | Oct 2025 |
| 907 | C N Operating Co | Drumright, OK 74030 | Oil & Gas Operator | Nov 1998 |
| 908 | C Rose Oil Co. | Midland, TX 79708 | Oil & Gas Operator | Dec 2025 |
| 909 | C-Water Disposal Inc | Oklahoma City, OK 73116-7326 | Oil Operator | Dec 2014 |
| 910 | C.J. Oil Company | Iowa Park, TX 76367 | Oil Operator | Jan 2025 |
| 911 | C5 Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Dec 2019 |
| 912 | Cable W S | Cleveland, OK 74020 | Oil Operator | Jan 2021 |
| 913 | Cabot Exploration Corp | Houston, TX 77070 | Oil Operator | Jun 1999 |
| 914 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 915 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 916 | Cactus Energy Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Dec 2025 |
| 917 | Cactus Oil & Gas LLC | Seminole, OK 74868-2430 | Oil & Gas Operator | Mar 2018 |
| 918 | Cactus Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Aug 2000 |
| 919 | Cactus Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2000 |
| 920 | Caddo Exploration, LLC | Norman, OK 73072 | Oil & Gas Operator | Jan 2026 |
| 921 | Caddo Oil & Gas Inc | Oklahoma City, OK 73157 | Oil & Gas Operator | Jan 1997 |
| 922 | Caddo-Marchand LC | Dallas, TX 75251-2202 | Oil & Gas Operator | Oct 2016 |
| 923 | Caerus Kansas LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 924 | Cain Randy A | Duncan, OK 73533 | Oil & Gas Operator | Dec 2025 |
| 925 | Cain Richard | Comanche, OK 73529-1248 | Oil & Gas Operator | May 2020 |
| 926 | Cajeza Energy | Drumright, OK 74030 | Oil & Gas Operator | May 2013 |
| 927 | Cal-Tex Operating Co. | Manchaca, TX 78652 | Oil & Gas Operator | May 2020 |
| 928 | Calcuta Petroleum LLC | Edmond, OK 73013 | Oil Operator | Dec 2025 |
| 929 | Caldwell Engineering & Construction Inc | Chandler, OK 74834-5420 | Oil & Gas Operator | Jan 2025 |
| 930 | Calebs Resources LLC | Edmond, OK 73012 | Oil & Gas Operator | Dec 2025 |
| 931 | Calgary Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Dec 2025 |
| 932 | Call Harold Charles | Dewey, OK 74029 | Oil Operator | Dec 2025 |
| 933 | Call, Harold L | | Oil Operator | Mar 2015 |
| 934 | Callie Oil Company LLC | Perry, OK 73077 | Oil & Gas Operator | Dec 2025 |
| 935 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 936 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 937 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 938 | Calvert Drilling Co. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 1992 |
| 939 | Calvert Exploration Co | | Oil & Gas Operator | Apr 1993 |
| 940 | Calvert Operating LLC | Oklahoma City, OK 73118 | Oil Operator | Jan 2026 |
| 941 | Calyx Energy III LLC | Tulsa, OK 74136-4226 | Oil & Gas Operator | Dec 2025 |
| 942 | Calyx Energy LLC | Tulsa, OK 74146-3807 | Oil & Gas Operator | Feb 2020 |
| 943 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2026 |
| 944 | Camo Oil LLC | Stillwater, OK 74074 | Oil & Gas Operator | Jan 2026 |
| 945 | Camp Dennis | Ratliff City, OK 73081 | Oil & Gas Operator | Nov 2018 |
| 946 | Campbell B R | Ardmore, OK 73401 | Oil & Gas Operator | Oct 2002 |
| 947 | Campbell Don G | Konawa, OK 74849 | Oil Operator | Feb 1997 |
| 948 | Campbell Production Company | Tulsa, OK 74137-4145 | Oil & Gas Operator | Mar 2015 |
| 949 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 950 | Canaan Exploration Inc | Oklahoma City, OK 73123 | Oil & Gas Operator | Jan 1998 |
| 951 | Canaan Petroleum Inc | San Antonio, TX 78230-4042 | Oil & Gas Operator | Dec 2025 |
| 952 | Canaan Resources LLC | Oklahoma City, OK 73118-1126 | Gas Operator | Oct 2023 |
| 953 | Canaan Resources X LLC | Oklahoma City, OK 73103-4925 | Oil & Gas Operator | Sep 2024 |
| 954 | Canard Colvert Operating LLC | Dallas, TX 75231 | Oil & Gas Operator | Dec 2025 |
| 955 | Candy Oil Production | Sand Springs, OK 74063-3410 | Oil Operator | Feb 2017 |
| 956 | Cane Creek Energy Partners Inc | Morris, OK 74445 | Oil & Gas Operator | Dec 2025 |
| 957 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | Mar 2026 |
| 958 | Cannuck Resources Inc | Nowata, OK 74048 | Oil & Gas Operator | Aug 2000 |
| 959 | Canok International Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Dec 2025 |
| 960 | Cantrell Energy Corporation | Ada, OK 74820-0835 | Oil & Gas Operator | Jan 2026 |
| 961 | Cantrell Robert R | Ada, OK 74820 | Oil & Gas Operator | Dec 2025 |
| 962 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2026 |
| 963 | Canyon Creek Energy Arkoma LLC | Tulsa, OK 74120-3017 | Oil & Gas Operator | Dec 2025 |
| 964 | Canyon Creek Energy Operating LLC | Tulsa, OK 74120 | Oil & Gas Operator | Jan 2026 |
| 965 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2026 |
| 966 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Oct 2025 |
| 967 | Cap Oil Company | Ada, OK 74820 | Oil Operator | Dec 2025 |
| 968 | Capataz Operating Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2020 |
| 969 | Cape Oil Associates | | Oil & Gas Operator | Sep 1997 |
| 970 | Capital Pet & Investments Inc | Oklahoma City, OK 73102-7400 | Oil & Gas Operator | Mar 2015 |
| 971 | Capital Programs Company Inc | Addison, TX 75001-6030 | Oil Operator | Jul 2021 |
| 972 | Capitol Well Servicing Co., Inc. | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2023 |
| 973 | Capmac Inc | Tulsa, OK 74105-7119 | Oil & Gas Operator | Jan 2007 |
| 974 | Caprock, Inc. | Ralls, TX 79357 | Oil & Gas Operator | Mar 2013 |
| 975 | Capstone Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Dec 2025 |
| 976 | Capstone Oilfield Disposal Service LLC | Hennessey, OK 73742 | Oil Operator | Dec 2019 |
| 977 | Capturepoint LLC | Allen, TX 75013 | Oil & Gas Operator | Mar 2026 |
| 978 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | Jan 2026 |
| 979 | Carbon Ridge Energy LLC | Norman, OK 73069 | Oil & Gas Operator | Jan 2026 |
| 980 | Cardinal Oil LLC | Drumright, OK 74030 | Oil & Gas Operator | Dec 2025 |
| 981 | Cardinal River Operating LLC | Oklahoma City, OK 73102-7109 | Oil & Gas Operator | Dec 2025 |
| 982 | Carey Gas Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 1999 |
| 983 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 984 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 985 | Carl Humphries Inc | Piedmont, OK 73078-0514 | Oil & Gas Operator | Jan 2026 |
| 986 | Carla Energy Corporation | Oklahoma City, OK 73154-1487 | Oil & Gas Operator | Nov 2014 |
| 987 | Carlin Oil And Gas Company | Tulsa, OK 74101-1019 | Oil & Gas Operator | May 1992 |
| 988 | Carlow Corp. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 989 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 990 | Carlton, Richard L | | Oil & Gas Operator | Aug 1999 |
| 991 | Carmac Energy Company LLC | Shawnee, OK 74804 | Oil Operator | Dec 2025 |
| 992 | Carmac Energy Corporation | Dallas, TX 75219-2311 | Oil & Gas Operator | Dec 2025 |
| 993 | Carman C Wilford | | Oil & Gas Operator | Jan 2007 |
| 994 | Carman Frances J | Pawhuska, OK 74056-0101 | Oil & Gas Operator | Aug 2013 |
| 995 | Carman Robert W | Bristow, OK 74010-3454 | Oil & Gas Operator | Dec 2025 |
| 996 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 997 | Carmichael Oil & Gas Company | Vallejo, CA 94591-5653 | Oil & Gas Operator | Apr 2014 |
| 998 | Carnes Crude Oil Reclaiming Industry | | Oil Operator | Dec 2019 |
| 999 | Carnes Petroleum Corporation | Cleveland, OK 74020 | Oil & Gas Operator | May 2020 |
| 1000 | Carney A B | | Oil & Gas Operator | Jan 2014 |