| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | California E.D.I. Inc. | Oil & Gas Operator | Jan 2018 | |
| 2 | California Resources Production Corporation | Oil & Gas Operator | Dec 2024 | |
| 3 | Campbell Energy Corp. | Oil & Gas Operator | May 1992 | |
| 4 | Capitol Oil Corporation | Oil & Gas Operator | Dec 2024 | |
| 5 | Casex Company | Oil & Gas Operator | Dec 2007 | |
| 6 | Castle Minerals | Oil & Gas Operator | Dec 2018 | |
| 7 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 8 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 9 | Clyde B. Baker Opr. | Gas Operator | Dec 1995 | |
| 10 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |