| 1 | C S J, Inc. | Austin, TX 78716 | Oil & Gas Operator | Feb 2026 |
| 2 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Nov 2025 |
| 3 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 4 | Caribou Operating Co. | Granbury, TX 76048 | Oil & Gas Operator | Mar 2010 |
| 5 | Carter Energy Corporation | Duncanville, TX 75138 | Oil & Gas Operator | Sep 2010 |
| 6 | Carter, Mattye Family Trust | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2002 |
| 7 | Carter, Mattye L., Estate Of | Gladewater, TX 75647 | Oil & Gas Operator | Feb 1995 |
| 8 | Casador Oil & Gas Co. | Keller, TX 76248 | Gas Operator | Aug 2003 |
| 9 | Case Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 10 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Feb 2026 |
| 11 | CDX Gas, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2009 |
| 12 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | Feb 2026 |
| 13 | Centaur Petroleum Corporation | Fort Worth, TX 76101 | Oil & Gas Operator | Feb 2026 |
| 14 | Centurion Oil & Gas Op. Co. Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 1998 |
| 15 | Century Petroleum, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 16 | Certified Petroleum Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | May 2006 |
| 17 | Chalker Energy Management II,LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2008 |
| 18 | Chalker Energy Management,LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2006 |
| 19 | Chalmers Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Apr 1997 |
| 20 | Chance Oil Co., Inc. | Vernon, TX 76385 | Oil & Gas Operator | Nov 2025 |
| 21 | Chanze Oil Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 22 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 23 | Chestnut Mountain Energy, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Feb 2026 |
| 24 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 25 | Citori Oil Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2004 |
| 26 | Citori Oil Company, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2014 |
| 27 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2026 |
| 28 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 29 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 30 | Colotex Operating, LLC | Aurora, CO 80015 | Oil & Gas Operator | Feb 2026 |
| 31 | Comanche Well Service Corp. | Plano, TX 75093 | Oil & Gas Operator | Feb 2026 |
| 32 | Concho Oilfield Service, Inc. | Albany, TX 76430 | Oil & Gas Operator | Apr 2013 |
| 33 | Continental Export Corporation | Bowie, TX 76230 | Oil & Gas Operator | Sep 2013 |
| 34 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 35 | Corda Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 36 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 37 | Cox, Lee Investments Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | Feb 2026 |
| 38 | Cra-Gro Crop Service, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 39 | Creswell, R.G. | Graham, TX 76450 | Oil & Gas Operator | Feb 2013 |
| 40 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 41 | Crimson Exploration Inc. | Houston, TX 77060 | Oil & Gas Operator | Apr 2006 |
| 42 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 43 | Cromeens Petroleum, Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | Sep 1996 |
| 44 | Crossbow Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 45 | Crown Equipment Co. | Weatherford, TX 76086 | Oil & Gas Operator | Feb 2026 |
| 46 | Crystal River Oil & Gas LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2023 |
| 47 | Culebra Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Dec 2000 |
| 48 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Feb 2026 |
| 49 | Cumberland Petroleum, Inc. II | Weatherford, TX 76086 | Oil & Gas Operator | May 1997 |
| 50 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |