| 1 | C & F Petroleum, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | May 2013 |
| 2 | Cabana Oil Corp. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2006 |
| 3 | Caraway Operating Co. | San Angelo, TX 76902 | Oil & Gas Operator | May 2024 |
| 4 | Cass Energy Corp | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 5 | Caza Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 6 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2024 |
| 7 | Cockrell Production Co., Inc. | Irving, TX 75014 | Oil & Gas Operator | May 2024 |
| 8 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 9 | Cometra Oil And Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 1997 |
| 10 | Concho Oilfield Serv & Oper Co. | Eden, TX 76837 | Oil & Gas Operator | May 2024 |
| 11 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 12 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 13 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 14 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 15 | Cyclone Exploration, Inc. | Florence, CO 81226 | Oil & Gas Operator | May 2024 |