| 1 | C And S Oil & Gas | San Antonio, TX 78217 | Oil & Gas Operator | Feb 1998 |
| 2 | Cag Petroleum Corp. | Dallas, TX 75382 | Oil & Gas Operator | Oct 2025 |
| 3 | Cago, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Oct 2025 |
| 4 | Cantro Exploration, Inc. | San Antonio, TX 78270 | Oil & Gas Operator | May 2000 |
| 5 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Oct 2025 |
| 6 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2025 |
| 7 | Centex Energy, LLC | Bryan, TX 77802 | Oil & Gas Operator | Oct 2025 |
| 8 | Central Plains Oil&Gas Corp. (A) | Bryan, TX 77802 | Oil & Gas Operator | Mar 2003 |
| 9 | CH-Seon Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 10 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Jul 2025 |
| 11 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 12 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 13 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 14 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 15 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | Oct 2025 |
| 16 | Chmelar, Eugene Oil & Gas | Caldwell, TX 77836 | Oil & Gas Operator | Oct 2025 |
| 17 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 18 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 19 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Jun 2025 |
| 20 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 21 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 22 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Jun 2025 |
| 23 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Aug 2025 |
| 24 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 25 | Coleman Oil & Gas Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2025 |
| 26 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 27 | Comanche Well Service Corp. | Plano, TX 75093 | Oil & Gas Operator | Oct 2025 |
| 28 | Comet Oil & Gas, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Oct 2025 |
| 29 | Comstock Oil & Gas, LLC | Frisco, TX 75034 | Oil & Gas Operator | Oct 2025 |
| 30 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 31 | Concord Operating Incorporated | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2008 |
| 32 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 33 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 34 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 35 | Crawford Energy Operating Co | Houston, TX 77056 | Oil & Gas Operator | Aug 2008 |
| 36 | Crawford Hughes Operating Co. | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2025 |
| 37 | Creative Oil & Gas Operating,LLC | Giddings, TX 78942 | Oil & Gas Operator | May 2024 |
| 38 | Crescent Exploration Company | Austin, TX 78767 | Oil & Gas Operator | Aug 1995 |
| 39 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 40 | CRM Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Oct 2025 |
| 41 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |
| 42 | Cyber Enviro-Tech Inc | San Tan Valley, AZ 85144 | Oil & Gas Operator | Oct 2025 |
| 43 | Cymri, L.L.C. | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |