| 1 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | Apr 2024 |
| 2 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2024 |
| 3 | Cactus Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Apr 2024 |
| 4 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 5 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 6 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 7 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 8 | Camoil, Inc. | Columbus, TX 78934 | Oil & Gas Operator | Apr 2024 |
| 9 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | Apr 2024 |
| 10 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | Feb 2024 |
| 11 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 12 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Apr 2024 |
| 13 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 14 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Apr 2024 |
| 15 | CBN Operating Corp. | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 16 | Cedar Point Oil Company | Baytown, TX 77520 | Oil & Gas Operator | Aug 2003 |
| 17 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Jan 2024 |
| 18 | Chartex Petroleum Company | Houston, TX 77070 | Oil & Gas Operator | Aug 2000 |
| 19 | Chenango Oil And Gas Co. | Groves, TX 77619 | Oil & Gas Operator | Apr 2024 |
| 20 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 21 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 22 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Apr 2024 |
| 23 | Christeve Oil Company, Inc. | Houston, TX 77068 | Oil & Gas Operator | Dec 2022 |
| 24 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 25 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 26 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 27 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 28 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | Apr 2024 |
| 29 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 30 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 31 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 32 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 33 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 34 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 35 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 36 | Contango Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 37 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 38 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 39 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 40 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 41 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 42 | Crest Resources & Expl. Corp. | Houston, TX 77079 | Oil & Gas Operator | Dec 1998 |
| 43 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 44 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 45 | Crude Production Company | Clyde, TX 79510 | Oil & Gas Operator | Apr 2024 |
| 46 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 47 | CWC Oil & Gas, LLC | Abilene, TX 79608 | Oil & Gas Operator | Apr 2024 |
| 48 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |