| 1 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Sep 2024 |
| 2 | Caldwell Production Co. Inc. | Borger, TX 79008 | Oil & Gas Operator | Aug 2010 |
| 3 | Cambridge Production, Inc. | Amarillo, TX 79120 | Oil & Gas Operator | Nov 2020 |
| 4 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2024 |
| 5 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2024 |
| 6 | Cardwell Oil Corporation | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 7 | CCT & Co. | Tucson, AZ 85704 | Oil & Gas Operator | Jan 1996 |
| 8 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2024 |
| 9 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Aug 2024 |
| 10 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2024 |
| 11 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2024 |
| 12 | Chi Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 13 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Dec 2024 |
| 14 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Dec 2024 |
| 15 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Dec 2024 |
| 16 | Cimarron Engineering, LLC | Kingsville, TX 78364 | Oil & Gas Operator | Dec 2024 |
| 17 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2024 |
| 18 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 19 | Clements Exploration Co | Oklahoma City, OK 73132-5922 | Oil & Gas Operator | Jan 2006 |
| 20 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | Dec 2024 |
| 21 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 22 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 23 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 24 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 25 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 26 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 27 | Contango Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 28 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2024 |
| 29 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2024 |
| 30 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 31 | Cordillera Energy PRTNRS III,LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2012 |
| 32 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 33 | Corgray Holdings, LLC | Fulshear, TX 77441 | Gas Operator | Mar 2016 |
| 34 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2024 |
| 35 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | Dec 2024 |
| 36 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 37 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Dec 2024 |
| 38 | CP Energy LLC | Edmond, OK 73034 | Oil Operator | Oct 2024 |
| 39 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2024 |
| 40 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Sep 2024 |
| 41 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 42 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 43 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2024 |
| 44 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |