| 1 | C & H Well Servicing Inc | Gillette, WY 82717 | Oil & Gas Operator | Mar 2024 |
| 2 | Calco Inc | | Oil & Gas Operator | Feb 1991 |
| 3 | Cambria Oil Company | Casper, WY 82601 | Oil & Gas Operator | Dec 1996 |
| 4 | Camwest II LP | McKinney, TX 75070 | Oil & Gas Operator | Jul 2007 |
| 5 | Camwest Limited Partnership | Denver, CO 80202 | Oil & Gas Operator | Apr 2004 |
| 6 | Carbon Creek Energy LLC | Sheridan, WY 82801 | Oil & Gas Operator | Feb 2024 |
| 7 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Mar 2024 |
| 8 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 9 | Caza Exploration Company | | Oil Operator | Nov 1991 |
| 10 | Cedar Resources Corporation | Gillette, WY 82717 | Gas Operator | Dec 2010 |
| 11 | Cedar Ridge Operating Co LLC | Durango, CO 81303 | Gas Operator | Dec 2009 |
| 12 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 13 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 14 | Cenergy Resources LLC | | Oil & Gas Operator | Mar 2024 |
| 15 | Cenex | | Oil & Gas Operator | Dec 1996 |
| 16 | Central Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Jan 2024 |
| 17 | Century Energy | Gillette, WY 82717 | Oil & Gas Operator | Dec 1996 |
| 18 | Century Oil & Gas Corporation | | Oil & Gas Operator | Dec 1987 |
| 19 | Century Oil And Gas LLC | Katy, TX 77494 | Oil & Gas Operator | Mar 2024 |
| 20 | CH4 Energy LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2006 |
| 21 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Mar 2024 |
| 22 | Chambers Jerry | Denver, CO 80237 | Oil & Gas Operator | Dec 1993 |
| 23 | Chandler Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2009 |
| 24 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2024 |
| 25 | Chaparral Resources Inc | Denver, CO 80293 | Oil & Gas Operator | Jan 1996 |
| 26 | Charger Resources, LLC | Hurst, TX 76054 | Oil & Gas Operator | Aug 2015 |
| 27 | Chemily Management Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2023 |
| 28 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2024 |
| 29 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2024 |
| 30 | Chipcore LLC | Casper, WY 82601 | Oil & Gas Operator | Mar 2024 |
| 31 | Chriscor Oil & Gas | Plana, TX 75075 | Oil & Gas Operator | Jul 1987 |
| 32 | CHS McPherson Refinery Inc | Platteville, CO 80651 | Oil & Gas Operator | Apr 1994 |
| 33 | Ciris Energy Inc | Centennial, CO 80112 | Gas Operator | Dec 2016 |
| 34 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2024 |
| 35 | CKT Energy LLC | Dallas, TX 75379 | Oil & Gas Operator | Sep 2020 |
| 36 | CLC Operations Inc | Midland, TX 79701 | Oil & Gas Operator | Mar 1997 |
| 37 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 38 | CNX Gas Company LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Mar 2024 |
| 39 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 40 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2024 |
| 41 | Coleman Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Jan 2023 |
| 42 | Coltrane Charles | | Oil Operator | Dec 1980 |
| 43 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 44 | Columbus Production Inc | | Oil & Gas Operator | Mar 2005 |
| 45 | Comdisco Exploration Inc | | Oil Operator | Dec 1990 |
| 46 | Comet Energy Services LLC | Traverse City, MI 49686 | Oil & Gas Operator | Oct 2011 |
| 47 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 48 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 49 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 50 | Contango Resources LLC | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 51 | Continental Industries LC | Casper, WY 82602 | Oil & Gas Operator | Feb 2008 |
| 52 | Continental Production Co LLC | Greenwood VIllage, CO 80155 | Oil & Gas Operator | Aug 2012 |
| 53 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | May 2024 |
| 54 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 55 | Cook D L | Holliday, TX 76366 | Oil & Gas Operator | Dec 2008 |
| 56 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 57 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Mar 2024 |
| 58 | Cordero Mining Co | Gillette, WY 82717 | Oil Operator | Nov 2009 |
| 59 | Cordero Oil And Gas LLC | Gillette, WY 82716 | Oil Operator | Nov 2021 |
| 60 | Corrida Oil Inc | Denver, CO 80217 | Oil & Gas Operator | Jun 1990 |
| 61 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 62 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 63 | Cowboy Clean Fuels LLC | Laramie, WY 82072 | Gas Operator | Mar 2024 |
| 64 | Cox Edwin L & Berry R | | Oil & Gas Operator | Oct 1987 |
| 65 | Cox Kendall Jay | Recluse, WY 28775 | Oil & Gas Operator | Aug 2016 |
| 66 | Cramer Oil Company | Denver, CO 80202 | Oil Operator | Aug 2012 |
| 67 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2024 |
| 68 | Creek Oil Company | Colorado Springs, CO 80906 | Oil & Gas Operator | Aug 2001 |
| 69 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | May 2024 |
| 70 | Crystal Exploration & Production Company | Shreveport, LA 71120 | Oil & Gas Operator | Feb 1995 |
| 71 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 72 | Czar Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Oct 1992 |