| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | C & R Well Servi | Oil Operator | Sep 1996 | |
| 2 | C & R Well Service, A General Partnership | Garnett, KS 66032 | Oil Operator | Dec 2009 |
| 3 | C & S Oil Company | Odessa, TX 79763 | Oil & Gas Operator | Nov 2019 |
| 4 | Caldwell Entr In | Oil Operator | Dec 1993 | |
| 5 | Chevron U S A In | Oil & Gas Operator | Sep 2000 | |
| 6 | Christian Operating Company | Cypress, TX 77429 | Oil & Gas Operator | Dec 2014 |
| 7 | Cleaver Loraine | Oil Operator | Dec 1996 | |
| 8 | Coastal Oil & Ga | Oil & Gas Operator | Oct 1996 | |
| 9 | Coen Energy | Oil Operator | Mar 1995 | |
| 10 | Colt Energy Inc | Iola, KS 66749 | Oil & Gas Operator | Jun 2025 |
| 11 | Colt Energy Inco | Oil & Gas Operator | Dec 1996 | |
| 12 | Colt Oil Company | Andrews, TX 79714 | Oil & Gas Operator | Feb 1996 |
| 13 | Conley, Harry | Colony, KS 66015 | Oil Operator | Jun 2025 |
| 14 | Cris Oil | Oil Operator | May 2025 | |
| 15 | Cross And Cross | Overland Park, KS 66214 | Oil Operator | Sep 1997 |