| 1 | C & A Oil Company | Edmond, OK 73013-9413 | Oil & Gas Operator | Mar 2015 |
| 2 | C & B Oil Company | Drumright, OK 74030 | Oil & Gas Operator | Mar 2025 |
| 3 | C & H Oil Company | Ratliff City, OK 73481-0130 | Oil & Gas Operator | Apr 2015 |
| 4 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Mar 2025 |
| 5 | C E D LC | Enid, OK 73702-0326 | Oil & Gas Operator | Oct 2021 |
| 6 | C E Harmon Oil Inc | Tulsa, OK 74136-6559 | Oil & Gas Operator | Mar 2025 |
| 7 | C.D. Operating Company, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 8 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Feb 2025 |
| 9 | Cactus Energy Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 10 | Calvert Exploration Co | | Oil & Gas Operator | Apr 1993 |
| 11 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 12 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 13 | Canard Colvert Operating LLC | Dallas, TX 75219-6243 | Oil & Gas Operator | Mar 2025 |
| 14 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Mar 2025 |
| 15 | Capstone Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2025 |
| 16 | Capstone Oilfield Disposal Service LLC | Hennessey, OK 73742 | Oil Operator | Dec 2019 |
| 17 | Capturepoint LLC | Allen, TX 75013 | Oil & Gas Operator | Jun 2025 |
| 18 | Carl Humphries Inc | Piedmont, OK 73078-0514 | Oil & Gas Operator | Mar 2025 |
| 19 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 20 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Mar 2025 |
| 21 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 22 | Cayman Exploration Corp. | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 23 | Cayman Resources Corporation | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 24 | CBS Energy LLC | Oklahoma City, OK 73142-4437 | Oil & Gas Operator | Feb 2025 |
| 25 | CDS Oil Company | Tulsa, OK 74147-1514 | Oil & Gas Operator | Mar 2015 |
| 26 | Centaur Resources Inc | Oklahoma City, OK 73142-6804 | Oil & Gas Operator | Feb 2025 |
| 27 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Apr 2025 |
| 28 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Mar 2025 |
| 29 | Chapman Exploration Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2013 |
| 30 | Cherry, William H., Inc. | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2015 |
| 31 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 32 | Chesapeake Permian LP | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Feb 2015 |
| 33 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jun 2025 |
| 34 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2025 |
| 35 | Chisholm Oil And Gas Operating LLC | Tulsa, OK 74103-3522 | Oil & Gas Operator | Feb 2025 |
| 36 | Chisholm Operating LLC | Oklahoma City, OK 73101-1502 | Oil & Gas Operator | Dec 2017 |
| 37 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Feb 2025 |
| 38 | Choate Kenny Dba Rebound Oil Co | Helena, OK 73741-0543 | Gas Operator | Mar 2025 |
| 39 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Jun 2025 |
| 40 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Jun 2025 |
| 41 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 42 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Feb 2025 |
| 43 | Cimarron Production Co Inc | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Feb 2025 |
| 44 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Jun 2025 |
| 45 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 46 | Clark And Clark | Princeton, NJ 08540-1930 | Oil & Gas Operator | Jul 2013 |
| 47 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 48 | Clifford Resources Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | Jul 2015 |
| 49 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 50 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Jun 2025 |
| 51 | Coastal States Gas Prod. Co. | | Oil & Gas Operator | Jun 1996 |
| 52 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 53 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 54 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Mar 2025 |
| 55 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jun 2025 |
| 56 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 57 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 58 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 59 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 60 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 61 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 62 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 63 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Jun 2025 |
| 64 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 65 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jun 2025 |
| 66 | Cooper Energy Corp | | Oil & Gas Operator | Jun 1995 |
| 67 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2025 |
| 68 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 69 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 70 | Corwin, B. V. | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 71 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 72 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 73 | Cottonmouth SWD LLC | Tulsa, OK 74103-3522 | Oil Operator | Feb 2025 |
| 74 | Council Oak Resources LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Mar 2025 |
| 75 | Covington Oil Company Inc | Nichols Hills, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 76 | CPRC Inc | Tulsa, OK 74103-5037 | Oil & Gas Operator | Apr 1997 |
| 77 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 78 | CRB Resources Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2025 |
| 79 | Creede Oil & Gas Company | Oklahoma City, OK 73102-7502 | Oil & Gas Operator | Jun 2006 |
| 80 | Cross Don | Cushing, OK 74023-6316 | Oil & Gas Operator | Feb 2022 |
| 81 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2025 |
| 82 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 83 | Crown Central Pet Corp | Bellaire, TX 77401 | Oil & Gas Operator | Dec 2016 |
| 84 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 85 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 86 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 87 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 88 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 89 | Crystal Energy Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2019 |
| 90 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Mar 2025 |
| 91 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Feb 2025 |