| 1 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 2 | Caerus Washco LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2019 |
| 3 | Cannon Resources Inc | | Oil & Gas Operator | Sep 2003 |
| 4 | Carrizo Niobrara LLC | | Oil & Gas Operator | Aug 2017 |
| 5 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 6 | Cascade Oil And Gas, Inc | | Oil & Gas Operator | Jun 2005 |
| 7 | CCRP Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2024 |
| 8 | CDM Oil & Gas | | Oil & Gas Operator | Oct 2018 |
| 9 | Ceh Operating LLC | | Oil & Gas Operator | Aug 2025 |
| 10 | Central Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 11 | CFG Energy, Inc | | Oil & Gas Operator | Apr 2006 |
| 12 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Aug 2025 |
| 13 | Charles P Dunning LLC | | Oil & Gas Operator | Apr 2025 |
| 14 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 15 | Churchill Energy Inc | | Oil & Gas Operator | Sep 2020 |
| 16 | Cirque Resources LP | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 17 | Civitas North LLC | | Oil & Gas Operator | Jul 2025 |
| 18 | Colorado Energy Minerals Inc | | Oil Operator | Dec 2010 |
| 19 | Colorado Oil & Gas Corporation | | Oil & Gas Operator | May 2003 |
| 20 | Colton Limited Liability Co | | Oil & Gas Operator | Sep 2023 |
| 21 | Condor Energy Technology LLC | | Oil & Gas Operator | Jul 2018 |
| 22 | Conquest Oil Company | Big Spring, TX 79721 | Oil & Gas Operator | Aug 2024 |
| 23 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Oct 2025 |
| 24 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2025 |
| 25 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 26 | Crestone Peak Resources Operating LLC | | Oil & Gas Operator | Jul 2025 |
| 27 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 28 | Cub Creek Energy LLC | | Oil & Gas Operator | Oct 2023 |