| 1 | Calera Gas LLC | Montevallo, AL 35115 | Gas Operator | Jun 2024 |
| 2 | Calhoun, Clay | | Gas Operator | Sep 1989 |
| 3 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Oct 2002 |
| 4 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 5 | Carless Resources, Inc. | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1997 |
| 6 | Carter Oil Co | | Oil & Gas Operator | Dec 2013 |
| 7 | Cci Robinson'S Bend LLC | | Gas Operator | Jun 2024 |
| 8 | Cedarhill Operating Company, L.L.C. | | Oil Operator | Dec 2007 |
| 9 | Cherry, Charles L. & Assoc., Inc. | | Oil & Gas Operator | Oct 1989 |
| 10 | Chevron Oil Company | | Oil & Gas Operator | Dec 1983 |
| 11 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Nov 2024 |
| 12 | Choctaw Holdings, Inc. | | Oil Operator | Dec 1974 |
| 13 | Citmoco Services, Inc. | | Oil Operator | Jan 1971 |
| 14 | Citronelle Operating Co., LLC | | Oil & Gas Operator | Sep 1997 |
| 15 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 16 | Coaltech, Inc. | | Gas Operator | Jun 1993 |
| 17 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 18 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Nov 2024 |
| 19 | Collet Oil Ventures, Inc. | Denver, CO 80217 | Oil & Gas Operator | Jun 2004 |
| 20 | Columbia Petroleum LLC | Brookhaven, MS 39601 | Oil & Gas Operator | Jun 2024 |
| 21 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 22 | Cox Exploration, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1999 |
| 23 | Crosbys Creek Oil & Gas, LLC | Ridgeland, MS 39157 | Oil & Gas Operator | Jun 2024 |
| 24 | Currie, V. Monta, Jr. | | Gas Operator | Nov 1990 |
| 25 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |