| 1 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 2 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2024 |
| 3 | Campbell B R | Ardmore, OK 73401 | Oil & Gas Operator | Oct 2002 |
| 4 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 5 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Oct 2024 |
| 6 | Carlow Corp. | Midland, TX 79702 | Oil & Gas Operator | Sep 2024 |
| 7 | Chatham Verdell | Ratliff City, OK 73081-0061 | Oil Operator | Oct 2009 |
| 8 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2024 |
| 9 | Cholla Petroleum, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2024 |
| 10 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Dec 2024 |
| 11 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Dec 2024 |
| 12 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 13 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 14 | Continental Exploration, L.L.C. | Lufkin, TX 75915 | Oil & Gas Operator | Dec 2024 |
| 15 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 16 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2024 |
| 17 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2024 |
| 18 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |