| 1 | C & J Field Services | | Oil & Gas Operator | Sep 2024 |
| 2 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Aug 2024 |
| 3 | Caerus Piceance LLC | | Oil & Gas Operator | Sep 2024 |
| 4 | Caerus Washco LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2019 |
| 5 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 6 | Cannon Resources Inc | | Oil & Gas Operator | Sep 2003 |
| 7 | Carbon Energy Corporation (USA) | Denver, CO 80290 | Oil & Gas Operator | Jul 2004 |
| 8 | Carrizo Niobrara LLC | | Oil & Gas Operator | Aug 2017 |
| 9 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 10 | Cascade Oil And Gas, Inc | | Oil & Gas Operator | Jun 2005 |
| 11 | Cascade Petroleum LLC | | Oil & Gas Operator | Nov 2015 |
| 12 | Catamount Energy Partners LLC | Denver, CO 80202 | Gas Operator | Oct 2024 |
| 13 | Cci Paradox Upstream LLC | | Oil & Gas Operator | Feb 2024 |
| 14 | CCRP Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 15 | CDM Oil & Gas | | Oil & Gas Operator | Oct 2018 |
| 16 | CDX Rockies LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2005 |
| 17 | Cedar Ridge LLC | | Oil & Gas Operator | Oct 2006 |
| 18 | Ceh Operating LLC | | Oil & Gas Operator | Sep 2024 |
| 19 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 20 | Central Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 21 | Central Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 22 | CFG Energy, Inc | | Oil & Gas Operator | Apr 2006 |
| 23 | CGT Inc | | Oil & Gas Operator | May 2015 |
| 24 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Oct 2024 |
| 25 | Chandler & Associates LLC | | Oil & Gas Operator | Jul 2001 |
| 26 | Chandler DJ Basin LLC | | Oil & Gas Operator | Jul 2012 |
| 27 | Charles P Dunning LLC | | Oil & Gas Operator | Jun 2024 |
| 28 | Chemco Inc | | Oil & Gas Operator | Sep 2023 |
| 29 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2024 |
| 30 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | Dec 2024 |
| 31 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2024 |
| 32 | Choctaw II Oil & Gas, LTD. | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 33 | Cholla Petroleum, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2024 |
| 34 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Jul 2024 |
| 35 | Churchill Energy Inc | | Oil & Gas Operator | Sep 2020 |
| 36 | Cig Resources Company | Colorado Spring, CO 80944-1087 | Oil & Gas Operator | Jun 2018 |
| 37 | Cinnamon Creek Oil & Gas Inc | | Oil Operator | Oct 2024 |
| 38 | Cirque Resources LP | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 39 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Dec 2024 |
| 40 | City & County Of Denver | | Oil & Gas Operator | Sep 2023 |
| 41 | Civitas North LLC | | Oil & Gas Operator | Sep 2024 |
| 42 | CLX Oil & Gas LLC | | Oil & Gas Operator | Feb 2005 |
| 43 | CM Production LLC | | Oil & Gas Operator | Aug 2020 |
| 44 | Coachman Energy Operating Company LLC | Englewood, CO 80111 | Oil & Gas Operator | May 2024 |
| 45 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 46 | Coleman Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Jan 2023 |
| 47 | Colorado Energy Minerals Inc | | Oil Operator | Dec 2010 |
| 48 | Colorado Interstate Gas Company LLC | Colorado Springs, CO 80944 | Oil & Gas Operator | Sep 2024 |
| 49 | Colorado Oil & Gas Corporation | | Oil & Gas Operator | May 2003 |
| 50 | Colton Limited Liability Co | | Oil & Gas Operator | Sep 2023 |
| 51 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Dec 2024 |
| 52 | Condor Energy Technology LLC | | Oil & Gas Operator | Jul 2018 |
| 53 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 54 | Conquest Oil Company | Big Spring, TX 79721 | Oil & Gas Operator | Aug 2024 |
| 55 | Consolidated Resources Inc | | Oil & Gas Operator | May 2004 |
| 56 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2024 |
| 57 | Copper Land Resources LLC | | Oil Operator | Sep 2024 |
| 58 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Aug 2024 |
| 59 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 60 | CPX Piceance Holdings LLC | | Oil & Gas Operator | Jul 2024 |
| 61 | Crestone Peak Resources Operating LLC | | Oil & Gas Operator | Sep 2024 |
| 62 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 63 | Crumley* Jack | | Oil Operator | Aug 2018 |
| 64 | Cub Creek Energy LLC | | Oil & Gas Operator | Oct 2023 |
| 65 | Curton Capital Corp | | Oil Operator | Sep 2015 |
| 66 | CWC Oil & Gas, LLC | Abilene, TX 79608 | Oil & Gas Operator | Dec 2024 |
| 67 | CWC Petro LLC | | Gas Operator | Aug 2023 |
| 68 | Cyanostar Energy, Inc | Tulsa, OK 74103-4122 | Oil & Gas Operator | Sep 2001 |
| 69 | Cypress Production, Inc. | Azle, TX 76020 | Oil & Gas Operator | Dec 2024 |