| 1 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | Dec 2024 |
| 2 | Cameron Exploration, Inc. | Longview, TX 75604 | Oil & Gas Operator | Dec 2024 |
| 3 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 4 | Carbon Oil Inc | Vidor, TX 77670 | Oil & Gas Operator | Dec 2024 |
| 5 | Century Exploration Houston, Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2011 |
| 6 | Century Exploration Houston, LLC | Austin, TX 78702 | Oil & Gas Operator | Jan 2016 |
| 7 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2024 |
| 8 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Aug 2024 |
| 9 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2024 |
| 10 | Choctaw Resources, Inc. | Aledo, TX 76008 | Oil & Gas Operator | Dec 2019 |
| 11 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Dec 2024 |
| 12 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 13 | Cleveland Production Company | Summit, MS 39666 | Oil & Gas Operator | Jul 1999 |
| 14 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 15 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Oct 2024 |
| 16 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 17 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 18 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 19 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Dec 2024 |
| 20 | Crest Resources & Expl. Corp. | Houston, TX 77079 | Oil & Gas Operator | Dec 1998 |
| 21 | Creston Petroleum Corp. | Dallas, TX 75380 | Oil & Gas Operator | Dec 2024 |