| 1 | C D Operating Company Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 2 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2026 |
| 3 | Cactus Energy Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2026 |
| 4 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2026 |
| 5 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 6 | Canard Colvert Operating LLC | Dallas, TX 75231 | Oil & Gas Operator | Apr 2026 |
| 7 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2026 |
| 8 | Capmac Inc | Tulsa, OK 74105-7119 | Oil & Gas Operator | Jan 2007 |
| 9 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 10 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2026 |
| 11 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 12 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 13 | Carrera Energy LLC | Midland, TX 79704-5036 | Oil & Gas Operator | Mar 2026 |
| 14 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | May 2026 |
| 15 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Apr 2026 |
| 16 | CBS Energy LLC | Oklahoma City, OK 73142-4437 | Oil & Gas Operator | Apr 2026 |
| 17 | Cenergy Exploration Company | Dallas, TX 75231 | Oil & Gas Operator | Sep 2000 |
| 18 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2026 |
| 19 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | May 2026 |
| 20 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 21 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | May 2026 |
| 22 | Chen K Wendell | Arlington, TX 76016-2555 | Oil & Gas Operator | Mar 2015 |
| 23 | Cherry, William H., Inc. | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2015 |
| 24 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2026 |
| 25 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2026 |
| 26 | Chisholm Trail Energy Ops, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | May 2026 |
| 27 | Chisholm Trail Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2002 |
| 28 | Cimarex Energy Co Of Colorado | Midland, TX 79706 | Oil & Gas Operator | May 2026 |
| 29 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 30 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Apr 2026 |
| 31 | Citizen Energy II LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Apr 2025 |
| 32 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 33 | Citizen Energy Ventures LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2026 |
| 34 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Dec 2025 |
| 35 | Clark And Clark | Princeton, NJ 08540-1930 | Oil & Gas Operator | Jul 2013 |
| 36 | Clark Operating Services Inc | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 37 | Clydesdale Energy LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Nov 2019 |
| 38 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 39 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 40 | Coho Oil & Gas Inc | Coppell, TX 75019-8288 | Oil & Gas Operator | Mar 2015 |
| 41 | Collier Petroleum Corporation | Taloga, OK 73667-9644 | Oil & Gas Operator | Jan 2013 |
| 42 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | May 2026 |
| 43 | Comanche Exploration Company | Oklahoma City, OK 73120-2797 | Oil & Gas Operator | Feb 2007 |
| 44 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | May 2026 |
| 45 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 46 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 47 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 48 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 49 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jul 2026 |
| 50 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | May 2026 |
| 51 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Jul 2026 |
| 52 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jul 2026 |
| 53 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 54 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Jul 2026 |
| 55 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 56 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 57 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Jul 2026 |
| 58 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 59 | Council Oak Resources LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Dec 2025 |
| 60 | Cox Oil & Gas Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 61 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 62 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 63 | CP Energy, LLC | Edmond, OK 73034 | Oil Operator | Jul 2025 |
| 64 | Crain & Deisenroth | Tulsa, OK 74103-4433 | Oil & Gas Operator | Mar 2015 |
| 65 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2026 |
| 66 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Apr 2026 |
| 67 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2026 |
| 68 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2026 |
| 69 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 70 | Crow Creek Operating Co III LLC | Tulsa, OK 74137-8432 | Oil & Gas Operator | Apr 2015 |
| 71 | Crow Oil LLC | Tulsa, OK 74133-2914 | Oil & Gas Operator | Sep 2019 |
| 72 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Apr 2026 |
| 73 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 74 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | May 2026 |