| 1 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 2 | Century Royalty 2000 GP, LLC | Conroe, TX 77301 | Oil & Gas Operator | Jun 2020 |
| 3 | Chase Energy, Inc. | Austin, TX 78763 | Oil & Gas Operator | Oct 2001 |
| 4 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2024 |
| 5 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | Nov 2024 |
| 6 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 7 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 8 | Cochise Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 9 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 10 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2024 |
| 11 | Comet Oil & Gas, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Nov 2024 |
| 12 | Comet Production | Conroe, TX 77305 | Oil Operator | Nov 2024 |
| 13 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 14 | Corda Corporation | Wichita Falls, TX 76302 | Oil & Gas Operator | Nov 2024 |
| 15 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2024 |
| 16 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 17 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |