| 1 | C & H Well Servicing Inc | Gillette, WY 82717 | Oil & Gas Operator | Aug 2025 |
| 2 | C & K Petroleum | | Oil & Gas Operator | Jan 1984 |
| 3 | C And M Oil Inc | Kimball, NE 69145 | Oil & Gas Operator | Dec 2024 |
| 4 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 5 | Caerus Northern Rockies LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2021 |
| 6 | Calco Inc | | Oil & Gas Operator | Feb 1991 |
| 7 | Callaway Oil & Gas LLC | Gillette, WY 82717 | Oil & Gas Operator | Jul 2025 |
| 8 | Cambria Oil Company | Casper, WY 82601 | Oil & Gas Operator | Dec 1996 |
| 9 | Camwest II LP | McKinney, TX 75070 | Oil & Gas Operator | Jul 2007 |
| 10 | Camwest Limited Partnership | Denver, CO 80202 | Oil & Gas Operator | Apr 2004 |
| 11 | Capitan Operating LLC | Reno, NV 89502 | Oil & Gas Operator | Jan 2013 |
| 12 | Capitol Oil & Gas Corporation | Centennial, WY 82055 | Oil Operator | Feb 2006 |
| 13 | Carbon Creek Energy LLC | Sheridan, WY 82801 | Oil & Gas Operator | Jul 2025 |
| 14 | Cardinal Wyoming LLC | | Oil & Gas Operator | Aug 2025 |
| 15 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 16 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Aug 2025 |
| 17 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 18 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 19 | Castle Rock Oil LLC | | Oil Operator | Aug 2025 |
| 20 | Cat Oil | Byron, WY 82412 | Oil Operator | May 2001 |
| 21 | Caza Exploration Company | | Oil Operator | Nov 1991 |
| 22 | CCRP Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2024 |
| 23 | CDX Gas, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2009 |
| 24 | Cedar Resources Corporation | Gillette, WY 82717 | Gas Operator | Dec 2010 |
| 25 | Cedar Ridge Operating Co LLC | Durango, CO 81303 | Gas Operator | Dec 2009 |
| 26 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 27 | Celsius Energy Company | Denver, CO 80202-1558 | Oil & Gas Operator | Mar 2000 |
| 28 | Cenergy Resources LLC | | Oil & Gas Operator | Jul 2025 |
| 29 | Cenex | | Oil & Gas Operator | Dec 1996 |
| 30 | Centennial Energy | Thermopolis, WY 82443 | Oil & Gas Operator | Jul 2025 |
| 31 | Central Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 32 | Central Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 33 | Central Wyoming Resources LTD | Glenrock, WY 82637 | Oil Operator | Jul 2021 |
| 34 | Century Energy | Gillette, WY 82717 | Oil & Gas Operator | Dec 1996 |
| 35 | Century Oil & Gas Corporation | | Oil & Gas Operator | Dec 1987 |
| 36 | Century Oil And Gas LLC | Katy, TX 77494 | Oil & Gas Operator | Aug 2025 |
| 37 | Century Production Inc | | Oil & Gas Operator | Dec 1986 |
| 38 | CH4 Energy LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2006 |
| 39 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Aug 2025 |
| 40 | Chambers Jerry | Denver, CO 80237 | Oil & Gas Operator | Dec 1993 |
| 41 | Chancellor & Dolezal | | Gas Operator | Apr 1992 |
| 42 | Chandler Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2009 |
| 43 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 44 | Chaparral Resources Inc | Denver, CO 80293 | Oil & Gas Operator | Jan 1996 |
| 45 | Chapman Exploration Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2013 |
| 46 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 47 | Charger Resources, LLC | Hurst, TX 76054 | Oil & Gas Operator | Aug 2015 |
| 48 | Cheetah Oil Inc | Casper, WY 82602 | Oil & Gas Operator | Dec 2007 |
| 49 | Chemily Management Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2023 |
| 50 | Cherokee Oil Production Inc | Wichita, KS 67230 | Oil & Gas Operator | Jan 1997 |
| 51 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 52 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 53 | Cheyenne River LLC | Dallas, TX 75204 | Oil & Gas Operator | Nov 2018 |
| 54 | Chipcore LLC | Casper, WY 82601 | Oil & Gas Operator | Aug 2025 |
| 55 | Chippewa Oil & Gas Inc | Douglas, WY 82633 | Oil & Gas Operator | Jan 1985 |
| 56 | Chriscor Oil & Gas | Plana, TX 75075 | Oil & Gas Operator | Jul 1987 |
| 57 | Christensen C G | | Oil Operator | Sep 1990 |
| 58 | Christensen Ranch | Newcastle, WY 82701 | Oil Operator | Aug 2021 |
| 59 | Christmann John J | Lubbock, TX 79401 | Oil & Gas Operator | Dec 1994 |
| 60 | CHS McPherson Refinery Inc | Platteville, CO 80651 | Oil & Gas Operator | Apr 1994 |
| 61 | Cig Exploration | Denver, CO 80201 | Oil & Gas Operator | Sep 1999 |
| 62 | Cimarex Energy Co. | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 63 | Cinco Natural Resources Corp | La Grange, TX 78945 | Oil & Gas Operator | Oct 2025 |
| 64 | Ciris Energy Inc | Centennial, CO 80112 | Gas Operator | Dec 2016 |
| 65 | Cirque Resources LP | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 66 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 67 | CKT Energy LLC | Dallas, TX 75379 | Oil & Gas Operator | Sep 2020 |
| 68 | Clark Oil & Gas Inc | | Oil & Gas Operator | Dec 1990 |
| 69 | Clark Oil Producing Company | | Oil & Gas Operator | Oct 1979 |
| 70 | CLC Operations Inc | Midland, TX 79701 | Oil & Gas Operator | Mar 1997 |
| 71 | Cline Production Company | Billings, MT 59104 | Oil & Gas Operator | Jul 2025 |
| 72 | Clinton Oil Company | Wichita, KS 67202 | Oil & Gas Operator | Apr 1980 |
| 73 | Cloud Peak Operating LLC | Casper, WY 82601 | Oil Operator | Jul 2025 |
| 74 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 75 | CNX Gas Company LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Jul 2025 |
| 76 | Coal Creek Minerals LLC | Northglenn, CO 80234 | Gas Operator | Feb 2012 |
| 77 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 78 | Coastal Chem Inc | Midvale, UT 84047 | Oil & Gas Operator | Aug 2003 |
| 79 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 80 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 81 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Aug 2025 |
| 82 | Cohort Energy Company | Centennial, CO 80112 | Oil & Gas Operator | Feb 2007 |
| 83 | Coleman Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Jan 2023 |
| 84 | Colorado Oil & Gas Corporation | | Oil & Gas Operator | May 2003 |
| 85 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 86 | Coltrane Charles | | Oil Operator | Dec 1980 |
| 87 | Columbine Exploration Corp | Englewood, CO 80111 | Oil & Gas Operator | Aug 1998 |
| 88 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 89 | Columbus Production Inc | | Oil & Gas Operator | Mar 2005 |
| 90 | Comanche Oil & Gas Corp | Salt Lake City, UT 84107-3075 | Oil & Gas Operator | May 2005 |
| 91 | Combined Oil & Gas | Denver, CO 80202 | Oil & Gas Operator | Feb 1990 |
| 92 | Comdisco Exploration Inc | | Oil Operator | Dec 1990 |
| 93 | Comet Energy Services LLC | Traverse City, MI 49686 | Oil & Gas Operator | Oct 2011 |
| 94 | Common Energy Inc | Douglas, WY 82633 | Oil & Gas Operator | Aug 1995 |
| 95 | Condor Exploration LLC | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Sep 2009 |
| 96 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 97 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 98 | Conquest Exploration | Houston, TX 77068 | Oil & Gas Operator | May 1991 |
| 99 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 100 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Oct 2025 |