| 1 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 2 | Calhoun & Ellison Oil Co. | San Antonio, TX 78248 | Oil & Gas Operator | Dec 1997 |
| 3 | Can-Tex Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Nov 2003 |
| 4 | Canan Mowrey Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 5 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | Dec 2025 |
| 6 | Capco Resources Of Texas, Inc | Irving, TX 75063 | Oil & Gas Operator | Jun 2003 |
| 7 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Dec 2025 |
| 8 | Centaur Petroleum Corporation | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2025 |
| 9 | CH4 Energy Six, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2025 |
| 10 | Chan West Oil Corporation | Irving, TX 75016 | Oil & Gas Operator | Dec 2025 |
| 11 | Chanoco Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Jan 1998 |
| 12 | Chap Operating, Inc. | Knox City, TX 79529 | Oil & Gas Operator | Dec 2025 |
| 13 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 14 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 15 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 16 | China Star Oil Co., LLC | Woodway, TX 76712 | Oil & Gas Operator | Jun 2010 |
| 17 | Chisholm Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Dec 2025 |
| 18 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 19 | Cinnabar Energy, LTD. | Fort Worth, TX 76107 | Oil & Gas Operator | May 2018 |
| 20 | Clark, John M., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2025 |
| 21 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 22 | Clide Oil Corp. | Iraan, TX 79744 | Oil & Gas Operator | Nov 2015 |
| 23 | Clifton, Joe B. Exploration, Inc | Pauls Valley, OK 73075 | Oil & Gas Operator | Mar 2008 |
| 24 | Cockrell Production Co., Inc. | Irving, TX 75014 | Oil & Gas Operator | Dec 2025 |
| 25 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 26 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 27 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 28 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | Dec 2025 |
| 29 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 30 | Corda Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 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 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 34 | Crego Exploration | Dallas, TX 75243 | Oil & Gas Operator | Dec 2025 |
| 35 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2025 |
| 36 | Crown Equipment Co. | Weatherford, TX 76086 | Oil & Gas Operator | Dec 2025 |
| 37 | CRT'S, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Aug 2008 |
| 38 | Cucharas Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Dec 2000 |
| 39 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Dec 2025 |