| 1 | Caldera Operating Company LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 2 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | Jun 2025 |
| 3 | Canyon Oil & Gas Exploration LLC | San Antonio, TX 78258 | Oil & Gas Operator | May 2002 |
| 4 | Carey, Shirley L. Trust | Abilene, TX 79608 | Oil & Gas Operator | Jun 2025 |
| 5 | Carter Exploration Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 6 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Jun 2025 |
| 7 | CB Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2017 |
| 8 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | Jun 2025 |
| 9 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 10 | Charolais Energy, LLC | Kilgore, TX 75663 | Gas Operator | Jun 2025 |
| 11 | Chenango Oil And Gas Co. | Groves, TX 77619 | Oil & Gas Operator | Jun 2025 |
| 12 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2025 |
| 13 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jun 2025 |
| 14 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2025 |
| 15 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | Jun 2025 |
| 16 | Christopher Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2015 |
| 17 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 18 | Cinco Natural Resources Corp | La Grange, TX 78945 | Oil & Gas Operator | Jun 2025 |
| 19 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Jun 2025 |
| 20 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 21 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 22 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 23 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 24 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 25 | Coleville Petroleum Company | McAllen, TX 78503 | Oil & Gas Operator | Mar 1996 |
| 26 | Compass Operating, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 27 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 28 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 29 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Jun 2025 |
| 30 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Jun 2025 |
| 31 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 32 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 33 | Cotton Valley Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 34 | Couch Oil & Gas, Inc. | Dallas, TX 75229 | Oil & Gas Operator | Jun 2025 |
| 35 | Crawford Energy Operating Co | Houston, TX 77056 | Oil & Gas Operator | Aug 2008 |
| 36 | Crawford Energy, Incorporated | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 37 | Crawford Hughes Operating Co. | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2025 |
| 38 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 39 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 40 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 41 | Culoco, Inc. | Dallas, TX 75374 | Oil & Gas Operator | Nov 2024 |
| 42 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 43 | Cymri Corporation, The | Houston, TX 77057 | Oil & Gas Operator | Mar 2008 |
| 44 | Cymri, L.L.C. | Houston, TX 77042 | Oil & Gas Operator | Jun 2025 |