| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Carrizo Niobrara LLC | Oil & Gas Operator | Aug 2017 | |
| 2 | Cascade Oil And Gas, Inc | Oil & Gas Operator | Jun 2005 | |
| 3 | CGT Inc | Oil & Gas Operator | May 2015 | |
| 4 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | May 2025 |
| 5 | Charles P Dunning LLC | Oil & Gas Operator | Apr 2025 | |
| 6 | City & County Of Denver | Oil & Gas Operator | Sep 2023 | |
| 7 | Colorado Interstate Gas Company LLC | Colorado Springs, CO 80944 | Oil & Gas Operator | May 2025 |
| 8 | Colton Limited Liability Co | Oil & Gas Operator | Sep 2023 | |
| 9 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 10 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Apr 2025 |
| 11 | Crestone Peak Resources Operating LLC | Oil & Gas Operator | May 2025 | |
| 12 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |