| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | C & K Petroleum | Oil & Gas Operator | Jan 1984 | |
| 2 | Cat Oil | Byron, WY 82412 | Oil Operator | May 2001 |
| 3 | Cenex | Oil & Gas Operator | Dec 1996 | |
| 4 | Central Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Dec 2023 |
| 5 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 6 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 7 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Feb 2024 |
| 8 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 9 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 10 | Crystal Exploration & Production Company | Shreveport, LA 71120 | Oil & Gas Operator | Feb 1995 |