| 1 | C & B Energy Resources | Bartlesville, OK 74006 | Oil & Gas Operator | Mar 2015 |
| 2 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Sep 2025 |
| 3 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Aug 2025 |
| 4 | Callie Oil Company LLC | Perry, OK 73077 | Oil & Gas Operator | Aug 2025 |
| 5 | Calvert Exploration Co | | Oil & Gas Operator | Apr 1993 |
| 6 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 7 | Canard Colvert Operating LLC | Dallas, TX 75231 | Oil & Gas Operator | Sep 2025 |
| 8 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Sep 2025 |
| 9 | Capmac Inc | Tulsa, OK 74105-7119 | Oil & Gas Operator | Jan 2007 |
| 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 | Aug 2025 |
| 12 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 13 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 14 | Carrera Energy LLC | Midland, TX 79704-5036 | Oil & Gas Operator | Aug 2025 |
| 15 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 16 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 17 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 18 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Sep 2025 |
| 19 | Chermac Energy Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2020 |
| 20 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 21 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 22 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2025 |
| 23 | Chieftain Oil Co Inc | Kiowa, KS 67070 | Oil & Gas Operator | Sep 2025 |
| 24 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 25 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 26 | Cimarron River Operating Co | Mannford, OK 74044 | Oil & Gas Operator | Aug 2025 |
| 27 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Aug 2025 |
| 28 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 29 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 30 | Clark Exploration Company | Highlands Ranch, CO 80126-7645 | Oil & Gas Operator | Nov 2024 |
| 31 | Cleary Exploration LLC | Oklahoma City, OK 73112-7221 | Oil & Gas Operator | Oct 2014 |
| 32 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 33 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 34 | CMX Inc Of Kansas | Wichita, KS 67206-2561 | Oil & Gas Operator | Sep 2025 |
| 35 | CNR Resources Inc | Houston, TX 77002-4103 | Oil & Gas Operator | May 2005 |
| 36 | Coastal Oils Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2013 |
| 37 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 38 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | Sep 2025 |
| 39 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Sep 2025 |
| 40 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Dec 2025 |
| 41 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 42 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 43 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 44 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Dec 2025 |
| 45 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |
| 46 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 47 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2025 |
| 48 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Sep 2025 |
| 49 | Corman, Jack | Dallas, TX 75231 | Oil & Gas Operator | May 2022 |
| 50 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 51 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 52 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 53 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 54 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 55 | Crabtree Barbara T | Forney, TX 75126-5818 | Oil & Gas Operator | Oct 2024 |
| 56 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 57 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 58 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 59 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |
| 60 | Crow Oil LLC | Tulsa, OK 74133-2914 | Oil & Gas Operator | Sep 2019 |
| 61 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Aug 2025 |
| 62 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 63 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 64 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 65 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Dec 2025 |
| 66 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Sep 2025 |