| 1 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Jun 2025 |
| 2 | C E D LC | Enid, OK 73702-0326 | Oil & Gas Operator | Oct 2021 |
| 3 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 4 | Caddo Oil & Gas Inc | Oklahoma City, OK 73157 | Oil & Gas Operator | Jan 1997 |
| 5 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 6 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 7 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 8 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Jul 2025 |
| 9 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | Jul 2025 |
| 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 | Jul 2025 |
| 12 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 13 | Carney A B | | Oil & Gas Operator | Jan 2014 |
| 14 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Aug 2025 |
| 15 | Chambers Jerry Expl Co | | Oil & Gas Operator | Sep 2000 |
| 16 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Jul 2025 |
| 17 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 18 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 19 | Christeve Oil Company, Inc. | Houston, TX 77068 | Oil & Gas Operator | Dec 2022 |
| 20 | Cig Exploration Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 1999 |
| 21 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 22 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 23 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 24 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 25 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 26 | Clements Exploration Co | Oklahoma City, OK 73132-5922 | Oil & Gas Operator | Jan 2006 |
| 27 | Clemishire Don | Hominy, OK 74035 | Oil & Gas Operator | Jun 2025 |
| 28 | Clinton Public Works Authority | Clinton, OK 73601 | Oil & Gas Operator | May 2023 |
| 29 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 30 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 31 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 32 | Cobopco Inc | Tulsa, OK 74103-4391 | Oil & Gas Operator | Feb 1997 |
| 33 | Cochran Industrial Corporation | Cushing, OK 74023-1427 | Oil & Gas Operator | Apr 2001 |
| 34 | Coho Oil & Gas Inc | Coppell, TX 75019-8288 | Oil & Gas Operator | Mar 2015 |
| 35 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 36 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 37 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Jul 2025 |
| 38 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 2025 |
| 39 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 40 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 41 | Confederate Spooling Inc | Okemah, OK 74859-2409 | Oil & Gas Operator | Apr 2020 |
| 42 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 43 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 44 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Oct 2025 |
| 45 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 46 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Oct 2025 |
| 47 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2025 |
| 48 | Cooper Production Company | New Braunfels, TX 78132 | Oil & Gas Operator | Sep 2021 |
| 49 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 50 | Cordillera Energy Partners LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 51 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 52 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 53 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 54 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Jun 2025 |
| 55 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 56 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 57 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 58 | Crow Oil LLC | Tulsa, OK 74133-2914 | Oil & Gas Operator | Sep 2019 |
| 59 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jun 2025 |