| 1 | C & D Drilling Company | Hennepin, OK 73046 | Oil & Gas Operator | Mar 2007 |
| 2 | C & D Supply | Cherokee, OK 73728-5817 | Oil & Gas Operator | Aug 2025 |
| 3 | C & Y Casing Pulling Company | Duncan, OK 73533 | Oil & Gas Operator | Sep 2025 |
| 4 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Aug 2025 |
| 5 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 6 | Cactus Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Aug 2000 |
| 7 | Cactus Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Nov 2000 |
| 8 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 9 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 10 | Canard Colvert Operating LLC | Dallas, TX 75231 | Oil & Gas Operator | Sep 2025 |
| 11 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Sep 2025 |
| 12 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Aug 2025 |
| 13 | Capturepoint LLC | Allen, TX 75013 | Oil & Gas Operator | Dec 2025 |
| 14 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 15 | CB Oil Company | Drumright, OK 74030 | Oil & Gas Operator | Jul 2025 |
| 16 | Cenergy Exploration Company | Dallas, TX 75231 | Oil & Gas Operator | Sep 2000 |
| 17 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 18 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2025 |
| 19 | Centurion Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 20 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 21 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2025 |
| 22 | Chatham John | Wilson, OK 73463-9575 | Oil Operator | Feb 2014 |
| 23 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 24 | Chester Oil Company | Wetumka, OK 74883-6227 | Oil & Gas Operator | Aug 2025 |
| 25 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 26 | Choate Kenny Dba Rebound Oil Co | Helena, OK 73741-0543 | Gas Operator | Sep 2025 |
| 27 | Chockley Energy LLC | Beaver, OK 73932 | Gas Operator | Aug 2025 |
| 28 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 29 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 30 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Aug 2025 |
| 31 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Aug 2025 |
| 32 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Aug 2025 |
| 33 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Dec 2025 |
| 34 | Cities Services Company | | Oil & Gas Operator | Mar 2008 |
| 35 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 36 | Claassen Oil And Gas Inc | Estes Park, CO 80517 | Oil & Gas Operator | Jun 2025 |
| 37 | Claremont Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Feb 2017 |
| 38 | Claremont Exploration Inc | Tulsa, OK 74103-4107 | Oil & Gas Operator | Jun 1997 |
| 39 | Clayton Corp Petro & Natural Gas Prod | Lakewood, CO 80228-1836 | Oil & Gas Operator | Oct 2020 |
| 40 | Clayton Corporation | Golden, CO 80401 | Oil & Gas Operator | Dec 2019 |
| 41 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 42 | CMS Energy Inc | Dallas, TX 75287 | Oil & Gas Operator | Aug 2025 |
| 43 | CNR Resources Inc | Houston, TX 77002-4103 | Oil & Gas Operator | May 2005 |
| 44 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 45 | Coastal Oils Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2013 |
| 46 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2025 |
| 47 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 48 | Colorado Interstate Gas Co | Colorado Springs, CO 80944 | Oil & Gas Operator | Jul 2004 |
| 49 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 50 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 51 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 52 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Dec 2025 |
| 53 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 54 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 55 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 56 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 57 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 58 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Dec 2025 |
| 59 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |
| 60 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 61 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2025 |
| 62 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 63 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Sep 2025 |
| 64 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2025 |
| 65 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 66 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 67 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 68 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 69 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 70 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Dec 2025 |
| 71 | Courson, Harold D. | Perryton, TX 79070 | Oil & Gas Operator | Aug 1998 |
| 72 | Cox Oil & Gas Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 73 | Crain & Deisenroth | Tulsa, OK 74103-4433 | Oil & Gas Operator | Mar 2015 |
| 74 | Craw Operating LLC | Mooreland, OK 73852 | Oil & Gas Operator | Aug 2025 |
| 75 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 76 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Aug 2025 |
| 77 | Cross Timbers Oil Company | Dallas, TX 75284 | Oil & Gas Operator | May 2013 |
| 78 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 79 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 80 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |
| 81 | Crow Creek Operating Co III LLC | Tulsa, OK 74137-8432 | Oil & Gas Operator | Apr 2015 |
| 82 | Crown Central Pet Corp | Bellaire, TX 77401 | Oil & Gas Operator | Dec 2016 |
| 83 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 84 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 85 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 86 | Csoda Operating Company LLC | Amarillo, TX 79114-7506 | Oil & Gas Operator | Aug 2021 |
| 87 | Cudd Operating Corp | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 88 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Sep 2025 |
| 89 | Curran Oil Co | Great Falls, MT 59401 | Gas Operator | May 2001 |