| 901 | Cabot Exploration Corp | Houston, TX 77070 | Oil Operator | Jun 1999 |
| 902 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 903 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 904 | Cactus Energy Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2025 |
| 905 | Cactus Oil & Gas LLC | Seminole, OK 74868-2430 | Oil & Gas Operator | Mar 2018 |
| 906 | Cactus Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Aug 2000 |
| 907 | Cactus Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2000 |
| 908 | Caddo Exploration, LLC | Norman, OK 73072 | Oil & Gas Operator | May 2025 |
| 909 | Caddo Oil & Gas Inc | Oklahoma City, OK 73157 | Oil & Gas Operator | Jan 1997 |
| 910 | Caddo-Marchand LC | Dallas, TX 75251-2202 | Oil & Gas Operator | Oct 2016 |
| 911 | Caerus Kansas LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 912 | Cain Randy A | Duncan, OK 73533 | Oil & Gas Operator | May 2025 |
| 913 | Cain Richard | Comanche, OK 73529-1248 | Oil & Gas Operator | May 2020 |
| 914 | Cajeza Energy | Drumright, OK 74030 | Oil & Gas Operator | May 2013 |
| 915 | Cal-Tex Operating Co. | Manchaca, TX 78652 | Oil & Gas Operator | May 2020 |
| 916 | Calcuta Petroleum LLC | Edmond, OK 73013 | Oil Operator | Apr 2025 |
| 917 | Caldwell Engineering & Construction Inc | Chandler, OK 74834-5420 | Oil & Gas Operator | Jan 2025 |
| 918 | Calebs Resources LLC | Edmond, OK 73012 | Oil & Gas Operator | Apr 2025 |
| 919 | Calgary Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Apr 2025 |
| 920 | Call Harold Charles | Dewey, OK 74029 | Oil Operator | Apr 2025 |
| 921 | Call, Harold L | | Oil Operator | Mar 2015 |
| 922 | Callie Oil Company LLC | Perry, OK 73077 | Oil & Gas Operator | May 2025 |
| 923 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 924 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 925 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 926 | Calvert Drilling Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 1992 |
| 927 | Calvert Exploration Co | | Oil & Gas Operator | Apr 1993 |
| 928 | Calvert Operating LLC | Oklahoma City, OK 73118 | Oil Operator | May 2025 |
| 929 | Calyx Energy III LLC | Tulsa, OK 74136-4226 | Oil & Gas Operator | Apr 2025 |
| 930 | Calyx Energy LLC | Tulsa, OK 74146-3807 | Oil & Gas Operator | Feb 2020 |
| 931 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 932 | Camo Oil LLC | Stillwater, OK 74074 | Oil & Gas Operator | May 2025 |
| 933 | Campbell B R | Ardmore, OK 73401 | Oil & Gas Operator | Oct 2002 |
| 934 | Campbell Don G | Konawa, OK 74849 | Oil Operator | Feb 1997 |
| 935 | Campbell Production Company | Tulsa, OK 74137-4145 | Oil & Gas Operator | Mar 2015 |
| 936 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 937 | Canaan Exploration Inc | Oklahoma City, OK 73123 | Oil & Gas Operator | Jan 1998 |
| 938 | Canaan Petroleum Inc | San Antonio, TX 78230-4042 | Oil & Gas Operator | Apr 2025 |
| 939 | Canaan Resources LLC | Oklahoma City, OK 73118-1126 | Gas Operator | Oct 2023 |
| 940 | Canaan Resources X LLC | Oklahoma City, OK 73103-4925 | Oil & Gas Operator | Sep 2024 |
| 941 | Canard Colvert Operating LLC | Dallas, TX 75219-6243 | Oil & Gas Operator | May 2025 |
| 942 | Candy Oil Production | Sand Springs, OK 74063-3410 | Oil Operator | Feb 2017 |
| 943 | Cane Creek Energy Partners Inc | Morris, OK 74445 | Oil & Gas Operator | Apr 2025 |
| 944 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | Jul 2025 |
| 945 | Cannuck Resources Inc | Nowata, OK 74048 | Oil & Gas Operator | Aug 2000 |
| 946 | Canok International Inc | Okmulgee, OK 74447 | Oil & Gas Operator | May 2025 |
| 947 | Cantrell Energy Corporation | Ada, OK 74820-0835 | Oil & Gas Operator | Apr 2025 |
| 948 | Cantrell Robert R | Ada, OK 74820 | Oil & Gas Operator | Apr 2025 |
| 949 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | May 2025 |
| 950 | Canyon Creek Energy Arkoma LLC | Tulsa, OK 74120-3017 | Oil & Gas Operator | Apr 2025 |
| 951 | Canyon Creek Energy Operating LLC | Tulsa, OK 74120 | Oil & Gas Operator | Apr 2025 |
| 952 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 953 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2025 |
| 954 | Cap Oil Company | Ada, OK 74820 | Oil Operator | Apr 2025 |
| 955 | Capataz Operating Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2020 |
| 956 | Cape Oil Associates | | Oil & Gas Operator | Sep 1997 |
| 957 | Capital Pet & Investments Inc | Oklahoma City, OK 73102-7400 | Oil & Gas Operator | Mar 2015 |
| 958 | Capital Programs Company Inc | Addison, TX 75001-6030 | Oil Operator | Jul 2021 |
| 959 | Capitol Well Servicing Co., Inc. | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2023 |
| 960 | Capmac Inc | Tulsa, OK 74105-7119 | Oil & Gas Operator | Jan 2007 |
| 961 | Caprock, Inc. | Ralls, TX 79357 | Oil & Gas Operator | Mar 2013 |
| 962 | Capstone Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2025 |
| 963 | Capstone Oilfield Disposal Service LLC | Hennessey, OK 73742 | Oil Operator | Dec 2019 |
| 964 | Capturepoint LLC | Allen, TX 75013 | Oil & Gas Operator | Jul 2025 |
| 965 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | May 2025 |
| 966 | Carbon Ridge Energy LLC | Norman, OK 73069 | Oil & Gas Operator | Apr 2025 |
| 967 | Cardinal Oil LLC | Drumright, OK 74030 | Oil & Gas Operator | Apr 2025 |
| 968 | Cardinal River Operating LLC | Oklahoma City, OK 73102-7109 | Oil & Gas Operator | Apr 2025 |
| 969 | Carey Gas Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 1999 |
| 970 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 971 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 972 | Carl Humphries Inc | Piedmont, OK 73078-0514 | Oil & Gas Operator | May 2025 |
| 973 | Carla Energy Corporation | Oklahoma City, OK 73154-1487 | Oil & Gas Operator | Nov 2014 |
| 974 | Carlin Oil And Gas Company | Tulsa, OK 74101-1019 | Oil & Gas Operator | May 1992 |
| 975 | Carlow Corp. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 976 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 977 | Carlton, Richard L | | Oil & Gas Operator | Aug 1999 |
| 978 | Carmac Energy Company LLC | Seminole, OK 74868 | Oil Operator | Apr 2025 |
| 979 | Carmac Energy Corporation | Dallas, TX 75219-2311 | Oil & Gas Operator | Apr 2025 |
| 980 | Carman C Wilford | | Oil & Gas Operator | Jan 2007 |
| 981 | Carman Frances J | Pawhuska, OK 74056-0101 | Oil & Gas Operator | Aug 2013 |
| 982 | Carman Robert W | Bristow, OK 74010-3454 | Oil & Gas Operator | Apr 2025 |
| 983 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 984 | Carmichael Oil & Gas Company | Vallejo, CA 94591-5653 | Oil & Gas Operator | Apr 2014 |
| 985 | Carnes Crude Oil Reclaiming Industry | | Oil Operator | Dec 2019 |
| 986 | Carnes Petroleum Corporation | Cleveland, OK 74020 | Oil & Gas Operator | May 2020 |
| 987 | Carney A B | | Oil & Gas Operator | Jan 2014 |
| 988 | Carney Mark C & Karen M | Dallas, TX 75206-4010 | Oil & Gas Operator | Oct 1994 |
| 989 | Carol Jo Dunegan | Bristow, OK 74010 | Oil Operator | Apr 2025 |
| 990 | Carpenter Luther | Skiatook, OK 74070-9124 | Oil & Gas Operator | Mar 2025 |
| 991 | Carpenter R L | Sapulpa, OK 74067-0452 | Oil Operator | Mar 2007 |
| 992 | Carr Exploration Corp. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 993 | Carrera Energy LLC | Midland, TX 79704-5036 | Oil & Gas Operator | Apr 2025 |
| 994 | Carroll M R Dba Carroll Production Company | Sapulpa, OK 74066 | Oil & Gas Operator | May 2025 |
| 995 | Carruth David C Family Trust | Russellville, AR 72811-2061 | Oil Operator | Aug 2002 |
| 996 | Carter County Salt Water Disposal Inc | Wilson, OK 73463 | Oil Operator | Apr 2025 |
| 997 | Carter Donald L | Sand Springs, OK 74063-8105 | Oil Operator | May 2006 |
| 998 | Carter Preston Drilling Co | Davis, OK 73030 | Gas Operator | Nov 2000 |
| 999 | Cartledge & Cartledge Oil Company Inc | Kiefer, OK 74041 | Oil & Gas Operator | May 2025 |
| 1000 | Cartledge Energy LLC | Sapulpa, OK 74066-6623 | Oil & Gas Operator | May 2025 |