| 1 | C & B Exploration Company, Inc. | | Oil & Gas Operator | Oct 2008 |
| 2 | C & D Resources, Inc. | | Oil & Gas Operator | Nov 2001 |
| 3 | C & VC, Inc. | | Oil & Gas Operator | Sep 1991 |
| 4 | C. L. Brown, III | | Oil Operator | Dec 1991 |
| 5 | C. L. Brown, Inc. | | Oil Operator | Dec 1999 |
| 6 | C.T.R. Oil, Inc. | | Oil & Gas Operator | Jan 2025 |
| 7 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Oct 2025 |
| 8 | Cajun Operating, Inc. | | Oil & Gas Operator | Jun 2011 |
| 9 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 10 | Cardinal Oil & Gas, Inc. | | Oil & Gas Operator | Jun 1995 |
| 11 | Caribe Resources, Inc. | | Oil & Gas Operator | Jan 1985 |
| 12 | Carrollton Resources Corp. | | Oil & Gas Operator | Sep 2000 |
| 13 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Oct 2025 |
| 14 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 15 | Cei Production Company | Dallas, TX 75225 | Oil & Gas Operator | Sep 1998 |
| 16 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 17 | Central Crude, Inc. | | Oil & Gas Operator | Jul 2014 |
| 18 | Chain Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 19 | Charleston Oil & Gas, Inc. | | Oil & Gas Operator | Mar 1997 |
| 20 | Cheniere Petroleum Corporation | | Oil & Gas Operator | Feb 1989 |
| 21 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 22 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 23 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 24 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 25 | CNG Producing Co.-Tulsa Div. | | Oil & Gas Operator | Jun 1986 |
| 26 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 27 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 28 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2024 |
| 29 | Coronado Oil & Minerals Co. | | Oil & Gas Operator | Sep 1980 |
| 30 | Cortex Energy, Inc. | Wichita, KS 67217 | Oil & Gas Operator | Dec 2024 |
| 31 | Covey Energy, Inc. | | Oil & Gas Operator | Jun 1998 |
| 32 | Covey Park Gas LLC | | Oil & Gas Operator | Aug 2019 |
| 33 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 34 | CPBG, LLC | | Oil Operator | Oct 2019 |
| 35 | Crebbs Oil Company | Batson, TX 77519 | Oil & Gas Operator | Jun 2024 |
| 36 | Crescent DRLG & DVLPMNT, Inc. | | Oil & Gas Operator | Oct 1992 |
| 37 | Crystal Oil And Land Company | | Oil & Gas Operator | May 1992 |
| 38 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |