| 1 | C & M Operating Company | Graham, TX 76450 | Oil & Gas Operator | Jan 2024 |
| 2 | Carl P. Roppolo, Jr. | | Oil & Gas Operator | Mar 1991 |
| 3 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 4 | Caspen Operating Company | Somerset, TX 78069 | Oil & Gas Operator | Mar 2008 |
| 5 | Cathey Oil, Inc. | | Oil & Gas Operator | Aug 2009 |
| 6 | Centennial Exploration, Inc. | | Oil & Gas Operator | Dec 1985 |
| 7 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 8 | Chanse Energy Corporation | | Oil & Gas Operator | Sep 2021 |
| 9 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2023 |
| 10 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2024 |
| 11 | Comco Of Louisiana, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2000 |
| 12 | Compass Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2024 |
| 13 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2023 |
| 14 | Concor Petroleum, Inc. | | Oil & Gas Operator | Feb 1983 |
| 15 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 16 | Covey Park Gas LLC | | Oil & Gas Operator | Aug 2019 |
| 17 | Crosstex Lig, LLC | | Oil Operator | Mar 2014 |
| 18 | Crystal Oil & Land Company | | Oil & Gas Operator | Apr 2002 |