| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | C & S Oil | Oil Operator | Dec 2019 | |
| 2 | C M T Petroleum | Oil Operator | Jul 1995 | |
| 3 | C3oil, LLC | New Strawn, KS 66839 | Oil Operator | May 2026 |
| 4 | Cal Oil | Oil Operator | Jul 1986 | |
| 5 | Chriestenson Oil LLC | Neosho Falls, KS 66758 | Oil Operator | May 2026 |
| 6 | CK Oil | Oil Operator | Mar 2026 | |
| 7 | Cleaver Loraine | Oil Operator | Dec 1996 | |
| 8 | Coen Energy Corporation | Overland Park, KS 66221 | Oil Operator | May 2026 |
| 9 | Colt Energy Inc | Iola, KS 66749 | Oil & Gas Operator | May 2026 |
| 10 | Craig Oil Company | Oil Operator | Dec 2019 |