| 1 | Cal-Tex Exploration & Production Company LLC | San Antonio, TX 78228 | Oil & Gas Operator | Feb 2026 |
| 2 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | Feb 2026 |
| 3 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 4 | Capps, R. Oil Corp. | Midland, TX 79704 | Oil & Gas Operator | Oct 2002 |
| 5 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 6 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | Feb 2026 |
| 7 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | Feb 2026 |
| 8 | Centaur Petroleum Corporation | Fort Worth, TX 76101 | Oil & Gas Operator | Feb 2026 |
| 9 | Centex Development | Giddings, TX 78942 | Oil & Gas Operator | Feb 2026 |
| 10 | Challenger Oil Inc | San Antonio, TX 78209 | Gas Operator | Feb 2026 |
| 11 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Dec 2025 |
| 12 | Cherry Oil & Gas | Luling, TX 78648 | Oil & Gas Operator | Dec 2000 |
| 13 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 14 | Chisholm Oil Investments | Seabrook, TX 77586 | Oil & Gas Operator | Feb 2026 |
| 15 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2026 |
| 16 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 17 | CL&F Operating LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2022 |
| 18 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | Feb 2026 |
| 19 | CLS Interests, Incorporated | Austin, TX 78734 | Oil & Gas Operator | Jan 1997 |
| 20 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 21 | CNS Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2010 |
| 22 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 23 | Coates Energy Trust | San Antonio, TX 78209 | Oil & Gas Operator | Aug 2008 |
| 24 | Concord Operating Incorporated | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2008 |
| 25 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 26 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 27 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Feb 2026 |
| 28 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 29 | Crawford Hughes Operating Co. | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2026 |
| 30 | Creative Oil & Gas Operating,LLC | Giddings, TX 78942 | Oil & Gas Operator | May 2024 |
| 31 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 32 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Feb 2026 |
| 33 | CWS Aceite Operating, Inc. | Cotulla, TX 78014 | Oil & Gas Operator | Aug 2018 |