| 1 | C & R Oil Co. | Abilene, TX 79605 | Oil & Gas Operator | Feb 2026 |
| 2 | Cabana Oil Corp. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2006 |
| 3 | Caddo Corporation | Austin, TX 78731 | Oil & Gas Operator | Feb 2026 |
| 4 | Calhoun & Ellison Oil Co. | San Antonio, TX 78248 | Oil & Gas Operator | Dec 1997 |
| 5 | Can-Tex Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Nov 2003 |
| 6 | Canan Mowrey Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 7 | Caribou Operating Co. | Granbury, TX 76048 | Oil & Gas Operator | Mar 2010 |
| 8 | Cass Energy Corp | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 9 | Cawell Energy, LLC | Spring, TX 77379 | Oil Operator | Feb 2026 |
| 10 | Cazar Energy Inc | Austin, TX 78734 | Oil & Gas Operator | Feb 2026 |
| 11 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | Feb 2026 |
| 12 | Certified Petroleum Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | May 2006 |
| 13 | Chanoco Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Jan 1998 |
| 14 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 15 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2026 |
| 16 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 17 | Chi Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 18 | Chisholm Exploration | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 19 | Chisholm Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Feb 2026 |
| 20 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 21 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 22 | Cinnabar Energy, LTD. | Fort Worth, TX 76107 | Oil & Gas Operator | May 2018 |
| 23 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Feb 2026 |
| 24 | CLC Operations Inc | Midland, TX 79701 | Oil & Gas Operator | Mar 1997 |
| 25 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 26 | Clear Water Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 27 | Clide Oil Corp. | Iraan, TX 79744 | Oil & Gas Operator | Nov 2015 |
| 28 | Coalinga Corporation | Houston, TX 77002 | Oil & Gas Operator | May 1999 |
| 29 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 30 | Cockrell Production Co., Inc. | Irving, TX 75014 | Oil & Gas Operator | Feb 2026 |
| 31 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 32 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 33 | Colemanite, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Feb 2026 |
| 34 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 35 | Comstock Energy, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2026 |
| 36 | Condor Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 37 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 38 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 39 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Feb 2026 |
| 40 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 41 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 42 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 43 | Coyote Services, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2002 |
| 44 | Crego Exploration | Dallas, TX 75243 | Oil & Gas Operator | Feb 2026 |
| 45 | Creston Petroleum Corp. | Dallas, TX 75380 | Oil & Gas Operator | Feb 2026 |
| 46 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2025 |
| 47 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2025 |
| 48 | Crown Petroleum Corp. | Oklahoma City, OK 73106 | Oil & Gas Operator | Feb 2026 |
| 49 | Crystal River Oil & Gas LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2023 |
| 50 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Feb 2026 |
| 51 | Cucharas Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Dec 2000 |
| 52 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Feb 2026 |
| 53 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |