| 1 | C & D Supply | Cherokee, OK 73728-5817 | Oil & Gas Operator | Mar 2026 |
| 2 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 3 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 4 | Calebs Resources LLC | Edmond, OK 73012 | Oil & Gas Operator | Feb 2026 |
| 5 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 6 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2026 |
| 7 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Oct 2025 |
| 8 | Carney Mark C & Karen M | Dallas, TX 75206-4010 | Oil & Gas Operator | Oct 1994 |
| 9 | Carr Exploration Corp. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 10 | Cei Petroleum Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Jul 2016 |
| 11 | Centurion Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 12 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Apr 2026 |
| 13 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Mar 2026 |
| 14 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2026 |
| 15 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2026 |
| 16 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jun 2026 |
| 17 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2026 |
| 18 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Feb 2026 |
| 19 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Jun 2026 |
| 20 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Mar 2026 |
| 21 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 22 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Feb 2026 |
| 23 | Circle 9 Resources LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Mar 2026 |
| 24 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Feb 2026 |
| 25 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Dec 2025 |
| 26 | Clifton & Associates Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2020 |
| 27 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 28 | Coastal Oils Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2013 |
| 29 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Jun 2026 |
| 30 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2026 |
| 31 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 32 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jun 2026 |
| 33 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 34 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 35 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 36 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jun 2026 |
| 37 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Apr 2026 |
| 38 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jun 2026 |
| 39 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2026 |
| 40 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 41 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 42 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 43 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2026 |
| 44 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 45 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 46 | Craw Operating LLC | Mooreland, OK 73852 | Oil & Gas Operator | Feb 2026 |
| 47 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2026 |
| 48 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Feb 2026 |
| 49 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 50 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 51 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |
| 52 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 53 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 54 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 55 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 56 | Csoda Operating Company LLC | Amarillo, TX 79114-7506 | Oil & Gas Operator | Aug 2021 |
| 57 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Mar 2026 |