| 1 | C & M Operating Company | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 2 | C. L. Morris, Inc. | | Oil & Gas Operator | Feb 2004 |
| 3 | C. M. Roberson | | Oil Operator | Jun 1984 |
| 4 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 5 | Canstar Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1994 |
| 6 | Carraway Co. | | Oil Operator | Apr 2006 |
| 7 | Caruthers Operating Co., Inc. | | Oil & Gas Operator | Jul 2010 |
| 8 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 9 | Celt Oil, Inc. | | Oil & Gas Operator | Jun 1986 |
| 10 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 11 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 12 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 13 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 14 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2025 |
| 15 | Chateau Oil And Gas, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2017 |
| 16 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 17 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2024 |
| 18 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 19 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 20 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 21 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 22 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 23 | Clements Energy, Inc. | | Oil & Gas Operator | Oct 1987 |
| 24 | Click Corp | Monroe, LA 71207 | Oil & Gas Operator | Jan 2025 |
| 25 | Coastal Management Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 26 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 27 | Cody C. Beasley | | Oil & Gas Operator | Apr 1987 |
| 28 | Comstock Oil & Gas -- La, Inc. | | Oil & Gas Operator | Mar 2005 |
| 29 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2024 |
| 30 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 31 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2025 |
| 32 | Contour Energy E & P, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 33 | Contour Energy E & P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2003 |
| 34 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 35 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2024 |
| 36 | Crystal Oil And Land Company | | Oil & Gas Operator | May 1992 |
| 37 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 38 | CSC Energy Corp. | | Oil & Gas Operator | Dec 2009 |
| 39 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |