| 1 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 2 | Capco Offshore Of Texas, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 3 | Capco Offshore, Inc. | Irving, TX 75063 | Oil & Gas Operator | May 2012 |
| 4 | Capco Resources Corporation | Irving, TX 75016 | Oil & Gas Operator | Mar 2004 |
| 5 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Oct 2025 |
| 6 | Cedar Point Oil Company | Baytown, TX 77520 | Oil & Gas Operator | Aug 2003 |
| 7 | Chain Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 8 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 9 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 10 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 11 | Chilton Energy | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Sep 2006 |
| 12 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Oct 2025 |
| 13 | Christopher Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2015 |
| 14 | Cimarex Energy Co. | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 15 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 16 | Cimarron Engineering Corp. | Kingsville, TX 78364 | Oil & Gas Operator | May 2015 |
| 17 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | Oct 2025 |
| 18 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 19 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 20 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 21 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2025 |
| 22 | Coastline Operating, L.L.C. | Houston, TX 77027 | Oil & Gas Operator | Dec 2006 |
| 23 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 24 | Cockburn Oil Corporation | Lubbock, TX 79493 | Oil & Gas Operator | Jul 2005 |
| 25 | Cologne Production Company | San Antonio, TX 78209 | Oil & Gas Operator | Nov 2014 |
| 26 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 27 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 28 | Comet Oil & Gas, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Oct 2025 |
| 29 | Comet Production | Conroe, TX 77305 | Oil Operator | Oct 2025 |
| 30 | Cometra Oil And Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 1997 |
| 31 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 32 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 33 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 34 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 35 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 36 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2024 |
| 37 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 38 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 39 | Crest Resources & Expl. Corp. | Houston, TX 77079 | Oil & Gas Operator | Dec 1998 |
| 40 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 41 | Crossroads Energy L.P. | Houston, TX 77064 | Oil & Gas Operator | Jun 2011 |
| 42 | Crossroads Energy Partners, LLC | Houston, TX 77070 | Oil & Gas Operator | Mar 2018 |
| 43 | Cwoc | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 44 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |