| 1 | CG&St Energy Services | Eastland, TX 76448 | Oil & Gas Operator | Oct 1999 |
| 2 | Chan West Oil Corporation | Irving, TX 75016 | Oil & Gas Operator | Feb 2026 |
| 3 | Chancellor, Earl Sales Co., Inc. | Sweetwater, TX 79556 | Oil & Gas Operator | Feb 2026 |
| 4 | Chenoweth, Grover | Marble Falls, TX 78654 | Oil & Gas Operator | Dec 2024 |
| 5 | Circle D Oil & Gas, Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Feb 2026 |
| 6 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 7 | Coleman & Johnson Oil Company | Brownwood, TX 76801 | Oil & Gas Operator | Feb 2026 |
| 8 | Comyn Natural Gas, Inc. | Fort Worth, TX 76163 | Oil & Gas Operator | Feb 2026 |
| 9 | Concho Oilfield Service, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2013 |
| 10 | Conquistador Petroleum,Inc. | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 11 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 12 | Crossbow Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 13 | Crosstex Services, L.L.C. | Tuscola, TX 79562 | Oil Operator | Feb 2026 |
| 14 | CRT'S, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Aug 2008 |
| 15 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 16 | CWC Oil & Gas, LLC | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |