| 1 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Feb 2025 |
| 2 | Cambridge Production, Inc. | Amarillo, TX 79120 | Oil & Gas Operator | Nov 2020 |
| 3 | Campbell Energy LLC | Carmi, IL 62821 | Oil Operator | Feb 2025 |
| 4 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Feb 2025 |
| 5 | Capstone Cactus Operating Comp. | Hennessey, OK 73742 | Oil & Gas Operator | Jun 2025 |
| 6 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Feb 2025 |
| 7 | Centurion Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 8 | CH-Seon Inc. | Dallas, TX 75251 | Oil & Gas Operator | Jun 2025 |
| 9 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 10 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Jun 2025 |
| 11 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2025 |
| 12 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 13 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2025 |
| 14 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jun 2025 |
| 15 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Jun 2025 |
| 16 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Jun 2025 |
| 17 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 18 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 19 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 20 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2025 |
| 21 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 22 | Comanche Operating Co. | Oklahoma City, OK 73120 | Oil & Gas Operator | Aug 2002 |
| 23 | Commonwealth Resources, LLC | Fort Collins, CO 80524 | Oil Operator | Dec 2008 |
| 24 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 25 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 26 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 27 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Jun 2025 |
| 28 | Coop Energy, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2025 |
| 29 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 30 | Cordillera Energy PRTNRS III,LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2012 |
| 31 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 32 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Jun 2025 |
| 33 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 34 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Jun 2025 |
| 35 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2025 |
| 36 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 37 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 38 | Credo Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | Jan 2013 |
| 39 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Feb 2025 |
| 40 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 41 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2025 |
| 42 | Crow Creek Operating Co II LLC | Houston, TX 77252 | Oil & Gas Operator | Jul 2011 |
| 43 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Feb 2025 |
| 44 | Crown Petroleum Corp. | Oklahoma City, OK 73106 | Oil & Gas Operator | Jun 2025 |
| 45 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 46 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |