| 1 | C & J Field Services | | Oil & Gas Operator | Sep 2025 |
| 2 | Caerus Piceance LLC | | Oil & Gas Operator | Sep 2025 |
| 3 | Caerus Washco LLC | Denver, CO 80202 | Gas Operator | Mar 2015 |
| 4 | Carrizo Niobrara LLC | | Oil & Gas Operator | Jun 2017 |
| 5 | Catamount Energy Partners LLC | Denver, CO 80202 | Gas Operator | Oct 2025 |
| 6 | CDM Oil & Gas | | Oil & Gas Operator | Apr 2017 |
| 7 | Ceh Operating LLC | | Oil & Gas Operator | Sep 2025 |
| 8 | Central Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 9 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 10 | Chandler DJ Basin LLC | | Oil & Gas Operator | Dec 2007 |
| 11 | Charles P Dunning LLC | | Oil & Gas Operator | Sep 2025 |
| 12 | Chemco Inc | | Oil & Gas Operator | Sep 2023 |
| 13 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 14 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 15 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 16 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 17 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Jun 2025 |
| 18 | Churchill Energy, Inc. | | Oil & Gas Operator | Aug 2020 |
| 19 | Cig Resources Company | Colorado Spring, CO 80944-1087 | Oil & Gas Operator | Jun 2018 |
| 20 | Cinnamon Creek Oil & Gas Inc | | Oil Operator | Oct 2025 |
| 21 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Dec 2025 |
| 22 | City & County Of Denver | | Oil & Gas Operator | Sep 2023 |
| 23 | Civitas North LLC | | Oil & Gas Operator | Sep 2025 |
| 24 | CM Production, LLC | | Oil & Gas Operator | Aug 2020 |
| 25 | Colorado Interstate Gas Company LLC | Colorado Springs, CO 80944 | Oil & Gas Operator | Sep 2025 |
| 26 | Colton Limited Liability Co | | Oil & Gas Operator | Sep 2023 |
| 27 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 28 | Consolidated Resources, Inc. | | Oil & Gas Operator | May 2004 |
| 29 | Copper Land Resources LLC | | Oil Operator | Sep 2025 |
| 30 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2025 |
| 31 | Crestone Peak Resources Operating LLC | | Oil & Gas Operator | Sep 2025 |
| 32 | Crowheart Energy LLC | Baggs, WY 82321 | Oil & Gas Operator | Sep 2025 |
| 33 | Cub Creek Energy LLC | | Oil & Gas Operator | Mar 2019 |
| 34 | CWC Petro LLC | | Gas Operator | Dec 2024 |