| 1 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | Apr 2024 |
| 2 | Cactus Gas & Oil, Inc. | San Antonio, TX 78259 | Oil & Gas Operator | Apr 2024 |
| 3 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 4 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 5 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 6 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 7 | Camoil, Inc. | Columbus, TX 78934 | Oil & Gas Operator | Apr 2024 |
| 8 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 9 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 10 | Carter Exploration Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 11 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Apr 2024 |
| 12 | Central Texas Operating, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 13 | Century Assets Corporation | Houston, TX 77056 | Oil Operator | Apr 2024 |
| 14 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 15 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2024 |
| 16 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2023 |
| 17 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2024 |
| 18 | Chestnut Explor. And Prod., Inc. | Dallas, TX 75208 | Oil & Gas Operator | Apr 2024 |
| 19 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 20 | Chilton Energy | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Sep 2006 |
| 21 | Chisholm Oil & Gas, LC | Buda, TX 78610 | Oil & Gas Operator | Apr 2024 |
| 22 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | Apr 2024 |
| 23 | Choctaw Resources, Inc. | Aledo, TX 76008 | Oil & Gas Operator | Dec 2019 |
| 24 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Apr 2024 |
| 25 | CHP Oil & Gas Company, L.C. | El Campo, TX 77437 | Oil & Gas Operator | Apr 2024 |
| 26 | Christeve Oil Company, Inc. | Houston, TX 77068 | Oil & Gas Operator | Dec 2022 |
| 27 | Cibolo Energy Operating, Inc. | Bulverde, TX 78163 | Oil & Gas Operator | Apr 2024 |
| 28 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 29 | Cimarron Engineering Corp. | Kingsville, TX 78364 | Oil & Gas Operator | May 2015 |
| 30 | Cimarron Engineering, LLC | Kingsville, TX 78364 | Oil & Gas Operator | Apr 2024 |
| 31 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 32 | Click Corp | Monroe, LA 71207 | Oil & Gas Operator | Jan 2004 |
| 33 | Coastal Investments Inc. | El Campo, TX 77437 | Oil & Gas Operator | Apr 2024 |
| 34 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 35 | Coastal Production Company, Inc. | El Campo, TX 77437 | Oil & Gas Operator | Aug 1995 |
| 36 | Coastline Exploration, Inc. | Stafford, TX 77477 | Oil & Gas Operator | Apr 2024 |
| 37 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 38 | Cockburn Oil Corporation | Lubbock, TX 79493 | Oil & Gas Operator | Jul 2005 |
| 39 | Colo Exploration Company, Inc. | Benbrook, TX 76126 | Oil & Gas Operator | Apr 2024 |
| 40 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 41 | Common Resources L.L.C. | The Woodlands, TX 77380 | Oil & Gas Operator | May 2010 |
| 42 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 43 | Cons Asset MGMT SVCS E&P Op, LLC | Houston, TX 77002 | Oil Operator | Dec 2017 |
| 44 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 45 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 46 | Contour Energy E & P, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 47 | Contour Energy E & P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2003 |
| 48 | Contour Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Dec 2015 |
| 49 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 50 | Cordele Development Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Apr 2024 |
| 51 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Apr 2024 |
| 52 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2023 |
| 53 | Corum Operating Company, LLC | Houston, TX 77055 | Oil & Gas Operator | Apr 2024 |
| 54 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 55 | Crawford Energy Operating Co | Houston, TX 77056 | Oil & Gas Operator | Aug 2008 |
| 56 | Crest Petroleum, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 57 | Crest Resources & Expl. Corp. | Houston, TX 77079 | Oil & Gas Operator | Dec 1998 |
| 58 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 59 | CTR Petroleum, Inc. | Corpus Chrsti, TX 78414 | Oil & Gas Operator | Mar 2015 |
| 60 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 61 | Cyclone Exploration, Inc. | Florence, CO 81226 | Oil & Gas Operator | Apr 2024 |
| 62 | Cypress E & P Corporation | Leander, TX 78646 | Oil & Gas Operator | Sep 2016 |
| 63 | Cypress Production, Inc. | Azle, TX 76020 | Oil & Gas Operator | Apr 2024 |