| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Caballero Operations LLC | Oil & Gas Operator | Feb 2026 | |
| 2 | California Hydrocarbons Corporation | Gas Operator | Mar 2026 | |
| 3 | California Resources Production Corporation | Oil & Gas Operator | Mar 2026 | |
| 4 | Campbell Energy Corporation | Oil & Gas Operator | May 1992 | |
| 5 | Castle Minerals | Oil & Gas Operator | Dec 2018 | |
| 6 | Cenex Inc. | Oil & Gas Operator | Dec 1994 | |
| 7 | Central Valley Gas Storage LLC | Gas Operator | Mar 2026 | |
| 8 | Century Production Inc | Oil & Gas Operator | Dec 1986 | |
| 9 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 10 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jun 2026 |
| 11 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 12 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 13 | Crest Oil & Gas Management Corp. | Oil & Gas Operator | Dec 2025 |