| 1 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Feb 2024 |
| 2 | Canyon Creek Energy Arkoma LLC | | Oil & Gas Operator | Jan 2024 |
| 3 | Canyon Creek Energy Operating LLC | | Oil & Gas Operator | Jan 2024 |
| 4 | Capstone Oilfield Disposal Service LLC | Hennessey, OK 73742-0698 | Oil Operator | Dec 2019 |
| 5 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 6 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2024 |
| 7 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 8 | Central Ok Reclamation LLC | | Oil & Gas Operator | Jun 2014 |
| 9 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2024 |
| 10 | Chapman Energy Oklahoma, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 11 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2024 |
| 12 | Chica Oil Company | Lago VIsta, TX 78645-6561 | Oil & Gas Operator | Mar 2001 |
| 13 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 14 | Coal Oil & Gas Company | Ada, OK 74821-0008 | Oil & Gas Operator | Feb 2024 |
| 15 | Cola Resources LLC | Houston, TX 77019-5639 | Gas Operator | Nov 2015 |
| 16 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 17 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2024 |
| 18 | Command Energy Operating LLC | | Oil & Gas Operator | Jan 2024 |
| 19 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 20 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 21 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 22 | Continental Natural Gas, Inc. | Tulsa, OK 74121 | Oil & Gas Operator | Jun 2018 |
| 23 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 24 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2024 |
| 25 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 26 | Corterra Energy Operating LLC | | Oil & Gas Operator | Aug 2021 |
| 27 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2023 |