| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | California Resources Production Corporation | Oil & Gas Operator | Dec 2023 | |
| 2 | Calnrg Operating LLC | Oil & Gas Operator | Dec 2023 | |
| 3 | Calresources LLC | Oil & Gas Operator | Dec 1996 | |
| 4 | Cather Rogers Barnes & Cree | Oil & Gas Operator | Dec 2009 | |
| 5 | Cather, Barnes & Cree | Oil & Gas Operator | Dec 2009 | |
| 6 | Central Park Energy | Oil & Gas Operator | Dec 1991 | |
| 7 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 8 | City Of Huntington Beach (Fire Dept.) | Oil & Gas Operator | Dec 2023 | |
| 9 | City Of Newport Beach | Oil & Gas Operator | Nov 2023 | |
| 10 | City Oil Corp. Oper. For | Oil & Gas Operator | Dec 1989 | |
| 11 | Clint H. Woodington | Oil Operator | Dec 1994 | |
| 12 | Columbine Associates | Oil & Gas Operator | Dec 2023 | |
| 13 | Cooper & Brain Inc. | Oil & Gas Operator | Nov 2023 | |
| 14 | Corona Development Co. Inc. | Oil Operator | Dec 1989 | |
| 15 | Coyote Oil LLC | Oil Operator | Jan 2018 |