| 1 | C & D Energy Company, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 1994 |
| 2 | C. W. Resources, Inc. | Longview, TX 75604 | Oil & Gas Operator | Oct 2025 |
| 3 | Calico Operating Co., Inc. | Dallas, TX 75205 | Oil & Gas Operator | Dec 2002 |
| 4 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2025 |
| 5 | Cardinal Operating Corporation | Waxahachie, TX 75165 | Oil & Gas Operator | Jan 1997 |
| 6 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Oct 2025 |
| 7 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 8 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 9 | Cci Gulf Coast Upstream LLC | Teague, TX 75860 | Oil & Gas Operator | Mar 2021 |
| 10 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 11 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 12 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 13 | Chinn Exploration Company | Longview, TX 75605 | Oil & Gas Operator | Nov 2015 |
| 14 | Clark, Richard E., Inc. | Longview, TX 75604 | Oil & Gas Operator | May 2001 |
| 15 | Classic Operating Co. LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 16 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 17 | CNS Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2010 |
| 18 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 19 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 20 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 21 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 22 | Cotton Valley Operations, Inc. | Longview, TX 75608 | Oil & Gas Operator | Oct 2025 |
| 23 | Cowrie Energy LLC | Austin, TX 78703 | Oil & Gas Operator | Oct 2025 |
| 24 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 25 | Cox, Robert G. & Associates,Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 1994 |
| 26 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Oct 2025 |
| 27 | Crestmont Operating LLC | New York, NY 10151 | Oil Operator | Oct 2025 |
| 28 | Cross Creek Energy LLC | Houston, TX 77074 | Oil & Gas Operator | Aug 2013 |
| 29 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |