| 1 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | Oct 2025 |
| 2 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Oct 2025 |
| 3 | Cabeza Oil And Gas, LLC | Austin, CO 81410 | Oil & Gas Operator | Mar 2022 |
| 4 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 5 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 6 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 7 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 8 | Camden Resources, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2008 |
| 9 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 10 | Camoil, Inc. | Columbus, TX 78934 | Oil & Gas Operator | Oct 2025 |
| 11 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | Oct 2025 |
| 12 | Capital A Corp. | San Antonio, TX 78279 | Oil & Gas Operator | Jun 2002 |
| 13 | Cardinal Operating Corporation | Waxahachie, TX 75165 | Oil & Gas Operator | Jan 1997 |
| 14 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Aug 2025 |
| 15 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 16 | Carter E&P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Dec 2016 |
| 17 | Carter Exploration Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 18 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Oct 2025 |
| 19 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 20 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Oct 2025 |
| 21 | CB Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2017 |
| 22 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2025 |
| 23 | Central Gulf Petroleum Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2025 |
| 24 | Centurion Exploration Company | Houston, TX 77042 | Oil & Gas Operator | May 2009 |
| 25 | Century Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 26 | Chandler Oil & Gas, LLC | Beeville, TX 78102 | Oil & Gas Operator | Oct 2025 |
| 27 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 28 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 29 | Charro Operating, L.L.C. | Englewood, CO 80112 | Oil & Gas Operator | Oct 2025 |
| 30 | Cherokee Production LLC | Goliad, TX 77963 | Oil Operator | Oct 2025 |
| 31 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 32 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 33 | Chesnutt Oil & Gas, Inc. | Mineral, TX 78125 | Oil & Gas Operator | Oct 2025 |
| 34 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 35 | Chiodo Corp. | San Antonio, TX 78232 | Oil & Gas Operator | Oct 2025 |
| 36 | Chisholm Oil & Gas, LC | Buda, TX 78610 | Oil & Gas Operator | Oct 2025 |
| 37 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 38 | Cibolo Energy Operating, Inc. | Bulverde, TX 78163 | Oil & Gas Operator | Oct 2025 |
| 39 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 40 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 41 | Cimarron Engineering Corp. | Kingsville, TX 78364 | Oil & Gas Operator | May 2015 |
| 42 | Cimarron Engineering, LLC | Kingsville, TX 78364 | Oil & Gas Operator | Oct 2025 |
| 43 | Cinco Natural Resources Corp | La Grange, TX 78945 | Oil & Gas Operator | Oct 2025 |
| 44 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | Oct 2025 |
| 45 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 46 | Clide Oil Corp. | Iraan, TX 79744 | Oil & Gas Operator | Nov 2015 |
| 47 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 48 | CLR Gauging Corp. | Tuleta, TX 78162 | Oil & Gas Operator | Oct 2025 |
| 49 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | Oct 2025 |
| 50 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 51 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 52 | Coastline Exploration, Inc. | Stafford, TX 77477 | Oil & Gas Operator | Oct 2025 |
| 53 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 54 | Cody Energy LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2020 |
| 55 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Aug 2025 |
| 56 | Collins Resources, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Mar 2011 |
| 57 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 58 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 59 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 60 | Consolidated Petro PTNRS I, LLC | Austin, TX 78759 | Oil & Gas Operator | Mar 2003 |
| 61 | Continental Exploration LLC | Richardson, TX 75080 | Oil & Gas Operator | Oct 2025 |
| 62 | Corda Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 63 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Oct 2025 |
| 64 | Corenergy Operating Group, LLC | Houston, TX 77074 | Oil & Gas Operator | Oct 2025 |
| 65 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 66 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 67 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 68 | Cowrie Energy LLC | Austin, TX 78703 | Oil & Gas Operator | Oct 2025 |
| 69 | Creston Petroleum Corp. | Dallas, TX 75380 | Oil & Gas Operator | Oct 2025 |
| 70 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 71 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 72 | CXL Energy LLC | Canada, 00100 | Oil & Gas Operator | Oct 2025 |