| 1 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Nov 2024 |
| 2 | Caddo Oil Co.,Inc. | | Oil & Gas Operator | Apr 1987 |
| 3 | Campground Corporation | | Oil Operator | Nov 2023 |
| 4 | Cardinal Petroleum Corp Of La | | Oil Operator | May 2003 |
| 5 | Caspen Operating Company | Somerset, TX 78069 | Oil & Gas Operator | Mar 2008 |
| 6 | Castor Production, L.L.C. | | Oil Operator | Jun 2024 |
| 7 | Cavenham Energy Resources Inc. | | Oil & Gas Operator | Apr 1991 |
| 8 | Cavenham Energy Resrces Inc JV | | Oil Operator | Mar 1991 |
| 9 | Cavenham Forest Ind., Inc. | | Oil & Gas Operator | Nov 1987 |
| 10 | Cavenham Forest Ind., Inc. J V | | Oil Operator | Nov 1987 |
| 11 | Cenla Oil Company, LLC | | Oil Operator | May 2024 |
| 12 | Chadco, Inc. | | Oil Operator | Jun 2024 |
| 13 | Clements Energy, Inc. | | Oil & Gas Operator | Oct 1987 |
| 14 | Colgrade Investment Corp. | | Oil Operator | Apr 2004 |
| 15 | Cross Development Co. | | Oil Operator | Dec 1989 |
| 16 | Crown Zellerbach | | Oil & Gas Operator | May 1986 |
| 17 | Crown Zellerbach & Newton | | Oil Operator | Apr 1986 |