| 1 | C & M Operating Company | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 2 | C & S Properties | | Oil & Gas Operator | Jun 1996 |
| 3 | C. L. Morris, Inc. | | Oil & Gas Operator | Feb 2004 |
| 4 | C. Smith & Associates, Inc. | | Oil Operator | Aug 1991 |
| 5 | Caddo Management, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 6 | Caddo Oil Co.,Inc. | | Oil & Gas Operator | Apr 1987 |
| 7 | Caddo Parish Holdings LLC | | Oil & Gas Operator | Jul 2020 |
| 8 | Caddo Resources Inc | | Oil & Gas Operator | Dec 1986 |
| 9 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 10 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2025 |
| 11 | Canstar Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1994 |
| 12 | Carl P. Roppolo, Jr. | | Oil & Gas Operator | Mar 1991 |
| 13 | Caruthers Operating Co., Inc. | | Oil & Gas Operator | Jul 2010 |
| 14 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 15 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 16 | Cathey Oil, Inc. | | Oil & Gas Operator | Aug 2009 |
| 17 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 18 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 19 | Charles E. Mayfield | | Oil & Gas Operator | Mar 2001 |
| 20 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 21 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 22 | Cinder Production Company | | Oil & Gas Operator | Apr 2014 |
| 23 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 24 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 25 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 26 | Cody C. Beasley | | Oil & Gas Operator | Apr 1987 |
| 27 | Comstock Oil & Gas -- La, Inc. | | Oil & Gas Operator | Mar 2005 |
| 28 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2024 |
| 29 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 30 | Cornerstone Natural Gas Co. | | Oil Operator | Oct 1999 |
| 31 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 32 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 33 | Covey Park Gas LLC | | Oil & Gas Operator | Aug 2019 |
| 34 | Crystal Oil And Land Company | | Oil & Gas Operator | May 1992 |
| 35 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 36 | CSX Oil & Gas Corporation | Houston, TX 77210-4326 | Oil & Gas Operator | Mar 1993 |
| 37 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |