| 1 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Feb 2024 |
| 2 | Cantrell Energy Corporation | Ada, OK 74820-0835 | Oil & Gas Operator | Jan 2024 |
| 3 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Mar 2024 |
| 4 | Capstone Oilfield Disposal Service LLC | Hennessey, OK 73742-0698 | Oil Operator | Dec 2019 |
| 5 | Central Ok Reclamation LLC | | Oil & Gas Operator | Jun 2014 |
| 6 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2024 |
| 7 | Chisum G H | Duncan, OK 73533 | Oil & Gas Operator | Dec 2010 |
| 8 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 9 | Cleveland Rod & Tracy | | Oil & Gas Operator | Jul 2023 |
| 10 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 11 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2024 |
| 12 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 13 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 14 | Crystal Energy Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2019 |