| 1 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 2 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2024 |
| 3 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 4 | Cashco, L.L.C. | Houston, TX 77024 | Oil & Gas Operator | Jul 1999 |
| 5 | Centex Energy, LLC | Bryan, TX 77802 | Oil & Gas Operator | Dec 2024 |
| 6 | Chalker Energy Management,LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2006 |
| 7 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 8 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2024 |
| 9 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Aug 2024 |
| 10 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2024 |
| 11 | Cheyenne Minerals, Inc. | Houston, TX 77030 | Oil & Gas Operator | Jun 2001 |
| 12 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Dec 2024 |
| 13 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 14 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 15 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Dec 2024 |
| 16 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 17 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 18 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 19 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 20 | Contango Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 21 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2024 |
| 22 | Contract Oil & Gas Service Co. | Tomball, TX 77375 | Oil & Gas Operator | Apr 2007 |
| 23 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 24 | Crimson Exploration Inc. | Houston, TX 77060 | Oil & Gas Operator | Apr 2006 |
| 25 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 26 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |