| 1 | Cago, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Oct 2025 |
| 2 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | Oct 2025 |
| 3 | Cameron Engineering, Inc | Montgomery, TX 77356 | Oil & Gas Operator | Jun 2003 |
| 4 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 5 | Camoil, Inc. | Columbus, TX 78934 | Oil & Gas Operator | Oct 2025 |
| 6 | Cantro Exploration, Inc. | San Antonio, TX 78270 | Oil & Gas Operator | May 2000 |
| 7 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Oct 2025 |
| 8 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2025 |
| 9 | CDC Operating Company | Dallas, TX 75218 | Oil & Gas Operator | Oct 2025 |
| 10 | Centex Energy, LLC | Bryan, TX 77802 | Oil & Gas Operator | Oct 2025 |
| 11 | Central Plains Oil&Gas Corp. (A) | Bryan, TX 77802 | Oil & Gas Operator | Mar 2003 |
| 12 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 13 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 14 | Chartex Petroleum Company | Houston, TX 77070 | Oil & Gas Operator | Aug 2000 |
| 15 | Chenango Oil And Gas Co. | Groves, TX 77619 | Oil & Gas Operator | Oct 2025 |
| 16 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 17 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 18 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 19 | Chisos Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 20 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | Oct 2025 |
| 21 | Chmelar, Eugene Oil & Gas | Caldwell, TX 77836 | Oil & Gas Operator | Oct 2025 |
| 22 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 23 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 24 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 25 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Jun 2025 |
| 26 | Cockrell Production Co., Inc. | Irving, TX 75014 | Oil & Gas Operator | Oct 2025 |
| 27 | Cody Energy LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2020 |
| 28 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Aug 2025 |
| 29 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 30 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 31 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 32 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 33 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 34 | Crawford Energy Operating Co | Houston, TX 77056 | Oil & Gas Operator | Aug 2008 |
| 35 | Crawford Energy, Incorporated | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 36 | Crawford Hughes Operating Co. | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2025 |
| 37 | Creative Oil & Gas Operating,LLC | Giddings, TX 78942 | Oil & Gas Operator | May 2024 |
| 38 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 39 | Crimson Energy PTNRS III, L.L.C. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2023 |
| 40 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |