| 1 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 2 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2025 |
| 3 | Chaparral Exploration, Inc. | | Oil & Gas Operator | Jun 2000 |
| 4 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 5 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 6 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 7 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 8 | Compass Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 9 | Comstock Oil & Gas -- La, Inc. | | Oil & Gas Operator | Mar 2005 |
| 10 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2024 |
| 11 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 12 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 13 | Crystal Oil And Land Company | | Oil & Gas Operator | May 1992 |
| 14 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 15 | CSM, Inc. | | Gas Operator | Oct 1990 |
| 16 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |