| 901 | Byng Operating LLC | Ada, OK 74820-0677 | Oil & Gas Operator | Jan 2025 |
| 902 | C & A Oil Company | Edmond, OK 73013-9413 | Oil & Gas Operator | Mar 2015 |
| 903 | C & B Energy Resources | Bartlesville, OK 74006 | Oil & Gas Operator | Mar 2015 |
| 904 | C & B Production | Ben Bolt, TX 78342 | Oil & Gas Operator | Apr 2025 |
| 905 | C & C Oil Co. | Borger, TX 79008 | Oil & Gas Operator | Jan 2025 |
| 906 | C & C Productions LLC | Muskogee, OK 74402 | Oil & Gas Operator | Feb 2025 |
| 907 | C & C Tank Service LLC | Blanchard, OK 73010 | Oil & Gas Operator | Sep 2022 |
| 908 | C & C Tank Truck Service Inc | Holdenville, OK 74848 | Oil Operator | Feb 2012 |
| 909 | C & D Drilling Company | Hennepin, OK 73046 | Oil & Gas Operator | Mar 2007 |
| 910 | C & D Supply LLC | Cherokee, OK 73728-5817 | Oil & Gas Operator | Feb 2025 |
| 911 | C & G Energy Inc | | Oil & Gas Operator | Jun 1996 |
| 912 | C & H Oil Company | Ratliff City, OK 73481-0130 | Oil & Gas Operator | Apr 2015 |
| 913 | C & J Exploration LLC | Colorado Springs, CO 80920-3946 | Oil & Gas Operator | Oct 2022 |
| 914 | C & J Trucks LLC | Seminole, OK 74868-5406 | Oil & Gas Operator | Mar 2025 |
| 915 | C & L Drilling Company | Ada, OK 74821-1252 | Oil & Gas Operator | Jan 2014 |
| 916 | C & L Enterprise Of Wagoner | Coweta, OK 74429-9657 | Oil Operator | Mar 2001 |
| 917 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Feb 2025 |
| 918 | C & L Oil Company | Cross Plains, TX 76443 | Oil & Gas Operator | Apr 2025 |
| 919 | C & M Exploration LLC | Tulsa, OK 74159-1331 | Oil & Gas Operator | Jun 2014 |
| 920 | C & M Operating Company | Graham, TX 76450 | Oil & Gas Operator | Jan 2025 |
| 921 | C & R Petroleum Co. | Duncan, OK 73533-1341 | Oil & Gas Operator | Feb 2025 |
| 922 | C & S Exploration Inc | | Oil & Gas Operator | Jun 2016 |
| 923 | C & S Oil Company | Odessa, TX 79763 | Oil & Gas Operator | Nov 2019 |
| 924 | C & T Energy Co | Bartlesville, OK 74006 | Oil & Gas Operator | Nov 2004 |
| 925 | C & T Energy LLC | Morris, OK 74445-2667 | Oil & Gas Operator | Jan 2025 |
| 926 | C & W Oil | Neodesha, KS 66757 | Oil Operator | Jan 2025 |
| 927 | C & W Oil Inc | | Oil & Gas Operator | Aug 2016 |
| 928 | C & W Operating LLC | Tulsa, OK 74145-7627 | Oil Operator | May 2020 |
| 929 | C & Y Casing Pulling Company | Duncan, OK 73533 | Oil & Gas Operator | Feb 2025 |
| 930 | C Bar K Enterprises Inc | Oklahoma City, OK 73154-1828 | Oil & Gas Operator | Dec 2022 |
| 931 | C E D LC | Enid, OK 73702-0326 | Oil & Gas Operator | Oct 2021 |
| 932 | C E Harmon Oil Inc | Tulsa, OK 74136-6559 | Oil & Gas Operator | Feb 2025 |
| 933 | C E L Inc | Bartlesville, OK 74006 | Oil & Gas Operator | Jan 2020 |
| 934 | C F & L Producing Co | | Oil & Gas Operator | Sep 2000 |
| 935 | C H E Company Inc | Shawnee, OK 74801 | Oil Operator | Feb 2012 |
| 936 | C L & S Oil Company Inc | Perry, OK 73077-0841 | Oil & Gas Operator | Jan 2018 |
| 937 | C Rose Oil Co. | Midland, TX 79708 | Oil & Gas Operator | Jan 2025 |
| 938 | C S Petroleum Inc | Norman, OK 73070 | Oil & Gas Operator | Dec 2024 |
| 939 | C&D Supply | Cherokee, OK 73728-5817 | Oil & Gas Operator | Jan 2025 |
| 940 | C-Water Disposal Inc | Oklahoma City, OK 73116-7326 | Oil Operator | Dec 2014 |
| 941 | C.D. Operating Company, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 942 | C.J. Oil Company | Iowa Park, TX 76367 | Oil Operator | Dec 2024 |
| 943 | C5 Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Dec 2019 |
| 944 | Cable W S | Cleveland, OK 74020 | Oil Operator | Jan 2021 |
| 945 | Cabot Exploration Corp | Houston, TX 77070 | Oil Operator | Jun 1999 |
| 946 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 947 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 948 | Cactus Energy Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 949 | Cactus Oil & Gas LLC | Seminole, OK 74868-2430 | Oil & Gas Operator | Mar 2018 |
| 950 | Cactus Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Aug 2000 |
| 951 | Cactus Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2000 |
| 952 | Caddo Exploration, LLC | Norman, OK 73072 | Oil & Gas Operator | Feb 2025 |
| 953 | Caddo Oil & Gas Inc | Oklahoma City, OK 73157 | Oil & Gas Operator | Jan 1997 |
| 954 | Caddo-Marchand LC | Dallas, TX 75251-2202 | Oil & Gas Operator | Oct 2016 |
| 955 | Caerus Kansas LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2025 |
| 956 | Cain Randy A | Duncan, OK 73533 | Oil & Gas Operator | Feb 2025 |
| 957 | Cain Richard | Comanche, OK 73529-1248 | Oil & Gas Operator | May 2020 |
| 958 | Cajeza Energy | Drumright, OK 74030 | Oil & Gas Operator | May 2013 |
| 959 | Cal-Tex Operating Co. | Manchaca, TX 78652 | Oil & Gas Operator | May 2020 |
| 960 | Caldwell Engineering & Construction Inc | Chandler, OK 74834-5420 | Oil & Gas Operator | Jan 2025 |
| 961 | Calebs Resources LLC | Edmond, OK 73012 | Oil & Gas Operator | Jan 2025 |
| 962 | Calgary Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Jan 2025 |
| 963 | Call Harold Charles | Dewey, OK 74029-3053 | Oil Operator | Jan 2025 |
| 964 | Call, Harold L | | Oil Operator | Mar 2015 |
| 965 | Callie Oil Company LLC | Perry, OK 73077-9375 | Oil & Gas Operator | Jan 2025 |
| 966 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 967 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 968 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 969 | Calvert Company | Oklahoma City, OK 73154-1589 | Oil & Gas Operator | Dec 2021 |
| 970 | Calvert Drilling Co. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 1992 |
| 971 | Calvert Exploration Co | | Oil & Gas Operator | Apr 1993 |
| 972 | Calvert Operating LLC | Oklahoma City, OK 73118 | Oil Operator | Feb 2025 |
| 973 | Calyx Energy III LLC | Tulsa, OK 74136-4226 | Oil & Gas Operator | Jan 2025 |
| 974 | Calyx Energy LLC | Tulsa, OK 74146-3807 | Oil & Gas Operator | Feb 2020 |
| 975 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 976 | Camo Oil LLC | Stillwater, OK 74074 | Oil & Gas Operator | Feb 2025 |
| 977 | Camp Dennis | Ratliff City, OK 73081 | Oil & Gas Operator | Nov 2018 |
| 978 | Campbell B R | Ardmore, OK 73401 | Oil & Gas Operator | Oct 2002 |
| 979 | Campbell Don G | Konawa, OK 74849 | Oil Operator | Feb 1997 |
| 980 | Campbell Production Company | Tulsa, OK 74137-4145 | Oil & Gas Operator | Mar 2015 |
| 981 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 982 | Canaan Exploration Inc | Oklahoma City, OK 73123 | Oil & Gas Operator | Jan 1998 |
| 983 | Canaan Petroleum Inc | San Antonio, TX 78230-4042 | Oil & Gas Operator | Jan 2025 |
| 984 | Canaan Resources LLC | Oklahoma City, OK 73118-1126 | Gas Operator | Oct 2023 |
| 985 | Canaan Resources X LLC | Oklahoma City, OK 73103-4925 | Oil & Gas Operator | Sep 2024 |
| 986 | Canadian Exploration Corp | | Oil & Gas Operator | Oct 1994 |
| 987 | Canard Colvert Operating LLC | Dallas, TX 75219-6243 | Oil & Gas Operator | Feb 2025 |
| 988 | Candy Oil Production | Sand Springs, OK 74063-3410 | Oil Operator | Feb 2017 |
| 989 | Cane Creek Energy Partners Inc | Morris, OK 74445 | Oil & Gas Operator | Jan 2025 |
| 990 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | Apr 2025 |
| 991 | Cannuck Resources Inc | Nowata, OK 74048 | Oil & Gas Operator | Aug 2000 |
| 992 | Canok International Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Jan 2025 |
| 993 | Cantrell Energy Corporation | Ada, OK 74820-0835 | Oil & Gas Operator | Feb 2025 |
| 994 | Cantrell Robert R | Ada, OK 74820 | Oil & Gas Operator | Jan 2025 |
| 995 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Feb 2025 |
| 996 | Canyon Creek Energy Arkoma LLC | Tulsa, OK 74120-3017 | Oil & Gas Operator | Jan 2025 |
| 997 | Canyon Creek Energy Operating LLC | Tulsa, OK 74120 | Oil & Gas Operator | Jan 2025 |
| 998 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 999 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Dec 2024 |
| 1000 | Cap Oil Company | Ada, OK 74820 | Oil Operator | Dec 2024 |