| 1 | C & C Operating, Inc. | | Oil Operator | Dec 2024 |
| 2 | C & M Operating Company | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 3 | C. L. Morris, Inc. | | Oil & Gas Operator | Feb 2004 |
| 4 | C. W. Brumley | | Oil & Gas Operator | Jun 2006 |
| 5 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Mar 2025 |
| 6 | Caddo Oil Co.,Inc. | | Oil & Gas Operator | Apr 1987 |
| 7 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 8 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Mar 2025 |
| 9 | Canstar Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1994 |
| 10 | Car-Tex Producing Company | | Oil & Gas Operator | Dec 1994 |
| 11 | Carmet Oil, Inc. | | Oil & Gas Operator | Dec 1990 |
| 12 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 13 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 14 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 15 | Cathey Oil, Inc. | | Oil & Gas Operator | Aug 2009 |
| 16 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 17 | Centennial Exploration, Inc. | | Oil & Gas Operator | Dec 1985 |
| 18 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 19 | Century Oil, Inc. | | Oil Operator | Apr 2022 |
| 20 | Chanse Energy Corporation | Shreveport, LA 71165-1572 | Oil & Gas Operator | Sep 2021 |
| 21 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2025 |
| 22 | Chaparral Exploration, Inc. | | Oil & Gas Operator | Jun 2000 |
| 23 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 24 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2024 |
| 25 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 26 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 27 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 28 | Civego, Inc. | | Oil & Gas Operator | Jul 1994 |
| 29 | Classic Hydrocarbons, Inc. | | Gas Operator | Dec 2007 |
| 30 | Columbia Petroleum Corp. | | Oil & Gas Operator | Jun 1982 |
| 31 | Comco Of Louisiana, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2000 |
| 32 | Compass Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2025 |
| 33 | Comstock Oil & Gas -- La, Inc. | | Oil & Gas Operator | Mar 2005 |
| 34 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2024 |
| 35 | Condor Energy, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Oct 2021 |
| 36 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 37 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 38 | Covey Park Gas LLC | | Oil & Gas Operator | Aug 2019 |
| 39 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Mar 2025 |
| 40 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2024 |
| 41 | Crosstex Lig, LLC | | Oil Operator | Mar 2014 |
| 42 | Crystal Gas, L.L.C. | | Oil & Gas Operator | Apr 2000 |
| 43 | Crystal Oil And Land Company | | Oil & Gas Operator | May 1992 |
| 44 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 45 | CSM, Inc. | | Gas Operator | Oct 1990 |
| 46 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 47 | Cypress Partners, Inc. | Houston, TX 77068 | Oil & Gas Operator | May 1999 |