| 1 | C & A Oil Company | Edmond, OK 73013-9413 | Oil & Gas Operator | Mar 2015 |
| 2 | C & C Oil Co. | Borger, TX 79008 | Oil & Gas Operator | Mar 2026 |
| 3 | C & J Exploration LLC | Colorado Springs, CO 80920-3946 | Oil & Gas Operator | Oct 2022 |
| 4 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Feb 2026 |
| 5 | C & Y Casing Pulling Company | Duncan, OK 73533 | Oil & Gas Operator | Mar 2026 |
| 6 | C D Operating Company Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 7 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 8 | Caddo Exploration, LLC | Norman, OK 73072 | Oil & Gas Operator | Mar 2026 |
| 9 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 10 | Calumet Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2019 |
| 11 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2026 |
| 12 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 13 | Canaan Resources X LLC | Oklahoma City, OK 73103-4925 | Oil & Gas Operator | Sep 2024 |
| 14 | Canard Colvert Operating LLC | Dallas, TX 75231 | Oil & Gas Operator | Feb 2026 |
| 15 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2026 |
| 16 | Capitol Well Servicing Co., Inc. | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2023 |
| 17 | Capstone Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2026 |
| 18 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 19 | Carl Humphries Inc | Piedmont, OK 73078-0514 | Oil & Gas Operator | Mar 2026 |
| 20 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 21 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 22 | Casillas Operating LLC | Tulsa, OK 74103-4060 | Oil & Gas Operator | Feb 2026 |
| 23 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Mar 2026 |
| 24 | Castelli Exploration Inc | Oklahoma City, OK 73162 | Oil & Gas Operator | Feb 2026 |
| 25 | Castlerock Resources Inc | Oklahoma City, OK 73116-3710 | Oil & Gas Operator | Jul 2020 |
| 26 | CB Oil Company | Drumright, OK 74030 | Oil & Gas Operator | Mar 2026 |
| 27 | CBL Resources LLC | Tulsa, OK 74136-6308 | Oil & Gas Operator | Mar 2026 |
| 28 | CDS Oil Company | Tulsa, OK 74147-1514 | Oil & Gas Operator | Mar 2015 |
| 29 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Apr 2026 |
| 30 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 31 | Champion Reserves-Cri Inc | Oklahoma City, OK 73123 | Oil & Gas Operator | Jun 1994 |
| 32 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Mar 2026 |
| 33 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2026 |
| 34 | Chen K Wendell | Arlington, TX 76016-2555 | Oil & Gas Operator | Mar 2015 |
| 35 | Chermac Energy Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2020 |
| 36 | Cherokee Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 37 | Cherokee Royalties & Minerals Inc | Duncan, OK 73533 | Oil & Gas Operator | Mar 2026 |
| 38 | Cherry, William H., Inc. | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2015 |
| 39 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2026 |
| 40 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jun 2026 |
| 41 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2026 |
| 42 | Chisholm Oil And Gas Operating LLC | Tulsa, OK 74103-3522 | Oil & Gas Operator | Feb 2026 |
| 43 | Chisholm Operating LLC | Oklahoma City, OK 73101-1502 | Oil & Gas Operator | Dec 2017 |
| 44 | Choctaw Gas Company | Quinton, OK 74561 | Gas Operator | Feb 2026 |
| 45 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Mar 2026 |
| 46 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 47 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Feb 2026 |
| 48 | Cities Services Company | | Oil & Gas Operator | Mar 2008 |
| 49 | Citizen Energy II LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Apr 2025 |
| 50 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Mar 2026 |
| 51 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Dec 2025 |
| 52 | Clark And Clark | Princeton, NJ 08540-1930 | Oil & Gas Operator | Jul 2013 |
| 53 | Clark Operating Services Inc | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 54 | Clifton & Associates Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2020 |
| 55 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 56 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 57 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 58 | Collet Oil Ventures Inc | Denver, CO 80217 | Oil & Gas Operator | Jun 2004 |
| 59 | Colonial Resources LLC | Edmond, OK 73003-3207 | Oil & Gas Operator | Aug 2019 |
| 60 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 61 | Columbia Production Company | Edmond, OK 73083 | Oil & Gas Operator | May 2020 |
| 62 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 63 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Mar 2026 |
| 64 | Comanche Exploration Company | Oklahoma City, OK 73120-2797 | Oil & Gas Operator | Feb 2007 |
| 65 | Comanche Petroleum Corporation | Oklahoma City, OK 73179 | Oil & Gas Operator | Apr 2024 |
| 66 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Mar 2026 |
| 67 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jun 2026 |
| 68 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 69 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 70 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 71 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 72 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jun 2026 |
| 73 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 74 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Apr 2026 |
| 75 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Jun 2026 |
| 76 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jun 2026 |
| 77 | Cook W R Inc | Duncan, OK 73534-0069 | Oil & Gas Operator | Jun 2000 |
| 78 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Feb 2026 |
| 79 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 80 | Corner Energy LLC | Oklahoma City, OK 73156-0548 | Oil & Gas Operator | Mar 2015 |
| 81 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 82 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 83 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 84 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Jun 2026 |
| 85 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 86 | CPRP Services LLC | Oklahoma City, OK 73102-5804 | Oil & Gas Operator | Mar 2026 |
| 87 | Crabtree Barbara T | Forney, TX 75126-5818 | Oil & Gas Operator | Oct 2024 |
| 88 | Craig Elder Oil And Gas LLC | Edmond, OK 73013 | Oil & Gas Operator | Mar 2026 |
| 89 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2026 |
| 90 | CRB Resources Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2026 |
| 91 | Creslenn Oil Co | | Oil & Gas Operator | Nov 1998 |
| 92 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2026 |
| 93 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 94 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 95 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 96 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 97 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 98 | Cudd Operating Corp | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 99 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Feb 2026 |