| 1 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2026 |
| 2 | Caddo Exploration, LLC | Norman, OK 73072 | Oil & Gas Operator | Feb 2026 |
| 3 | Calebs Resources LLC | Edmond, OK 73012 | Oil & Gas Operator | Feb 2026 |
| 4 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 5 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 6 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 7 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Oct 2025 |
| 8 | Capmac Inc | Tulsa, OK 74105-7119 | Oil & Gas Operator | Jan 2007 |
| 9 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | Feb 2026 |
| 10 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 11 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2026 |
| 12 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 13 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Feb 2026 |
| 14 | Champion Reserves-Cri Inc | Oklahoma City, OK 73123 | Oil & Gas Operator | Jun 1994 |
| 15 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Feb 2026 |
| 16 | Chapman Elise P Estate | | Oil & Gas Operator | Mar 2020 |
| 17 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2026 |
| 18 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2026 |
| 19 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 20 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Feb 2026 |
| 21 | Christa Oil Co | Cumberland, OH 43732 | Oil & Gas Operator | Nov 1999 |
| 22 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 23 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 24 | Citizen Energy Ventures LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 25 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Dec 2025 |
| 26 | Clydesdale Energy LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Nov 2019 |
| 27 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 28 | Co-St Oil Operating Co Inc | Enid, OK 73706 | Oil & Gas Operator | Apr 1997 |
| 29 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 30 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Apr 2026 |
| 31 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 32 | Cogburn Oil Co Inc | | Oil & Gas Operator | Jan 2026 |
| 33 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 34 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Feb 2026 |
| 35 | Comanche Petroleum Corporation | Oklahoma City, OK 73179 | Oil & Gas Operator | Apr 2024 |
| 36 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 37 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 38 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 39 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Apr 2026 |
| 40 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Apr 2026 |
| 41 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2026 |
| 42 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Jan 2026 |
| 43 | Cordillera Energy Partners III LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Mar 2014 |
| 44 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 45 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 46 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 47 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 48 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 49 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 50 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Jan 2026 |
| 51 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 52 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Feb 2026 |
| 53 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 54 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 55 | Culbreath Oil & Gas Co Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2026 |