| 1 | C & M Exploration LLC | Tulsa, OK 74159-1331 | Oil & Gas Operator | Jun 2014 |
| 2 | C Rose Oil Co. | Midland, TX 79708 | Oil & Gas Operator | Aug 2025 |
| 3 | Call Harold Charles | Dewey, OK 74029 | Oil Operator | Aug 2025 |
| 4 | Call, Harold L | | Oil Operator | Mar 2015 |
| 5 | Cannuck Resources Inc | Nowata, OK 74048 | Oil & Gas Operator | Aug 2000 |
| 6 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Oct 2025 |
| 7 | Carman Frances J | Pawhuska, OK 74056-0101 | Oil & Gas Operator | Aug 2013 |
| 8 | Carter Donald L | Sand Springs, OK 74063-8105 | Oil Operator | May 2006 |
| 9 | CBM Gas Company LLC | Dewey, OK 74029 | Oil & Gas Operator | Aug 2020 |
| 10 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2025 |
| 11 | Century Petroleum | Nowata, OK 74048 | Oil & Gas Operator | Dec 2000 |
| 12 | Cep Mid-Continent LLC | Skiatook, OK 74070 | Oil & Gas Operator | Sep 2025 |
| 13 | Cewell Energy LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 14 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2025 |
| 15 | Cimarron Production Co Inc | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Oct 2025 |
| 16 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Dec 2025 |
| 17 | Clift Cary E | Chickasha, OK 73018-6305 | Oil & Gas Operator | Jun 2025 |
| 18 | Clindco Inc | Bartlesville, OK 74006-6213 | Oil & Gas Operator | Oct 2019 |
| 19 | CLM Oil Production Inc | Bartlesville, OK 74006-4417 | Oil & Gas Operator | Oct 2025 |
| 20 | CM Oil Co. | FT Stockton, TX 79735 | Oil & Gas Operator | Dec 2025 |
| 21 | Cobalt Environmental Solutions LLC | Oklahoma City, OK 73101-0249 | Oil Operator | Jun 2019 |
| 22 | Coe Production Company | Talala, OK 74080-0264 | Oil & Gas Operator | Aug 2015 |
| 23 | Coe Production Company LLC | Talala, OK 74080 | Oil Operator | Sep 2025 |
| 24 | Coldren Oil & Gas Inc | Bartlesville, OK 74006-4729 | Oil & Gas Operator | Sep 1998 |
| 25 | Comdisco Resources Inc | | Oil Operator | Aug 2004 |
| 26 | Concorde Resources Corporation | Eufaula, OK 74432 | Oil & Gas Operator | Sep 2025 |
| 27 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 28 | Continental Energy | Garden City, KS 67846-0918 | Oil & Gas Operator | Jul 2017 |
| 29 | Corbell Wayne L | Fort Worth, TX 76111-4615 | Oil & Gas Operator | Apr 2023 |
| 30 | County Line Stripper Wells LLC | Chelsea, OK 74016 | Oil & Gas Operator | Aug 2025 |
| 31 | Cramer Oil LLC | Nowata, OK 74048-6011 | Oil Operator | Aug 2025 |
| 32 | Cricket Enterprises Corporation | Nowata, OK 74048-9683 | Oil & Gas Operator | Mar 2015 |
| 33 | CW Investments | Okmulgee, OK 74447-4026 | Oil & Gas Operator | Sep 2025 |