| 1 | C & H Oil Company | Ratliff City, OK 73481-0130 | Oil & Gas Operator | Apr 2015 |
| 2 | C & L Drilling Company | Ada, OK 74821-1252 | Oil & Gas Operator | Jan 2014 |
| 3 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Jan 2024 |
| 4 | C & L Oil Company | Cross Plains, TX 76443 | Oil & Gas Operator | Apr 2024 |
| 5 | C.J. Oil Company | Iowa Park, TX 76367 | Oil Operator | Feb 2024 |
| 6 | Cactus Oil & Gas LLC | Seminole, OK 74868-2430 | Oil & Gas Operator | Mar 2018 |
| 7 | Cajeza Energy | Drumright, OK 74030 | Oil & Gas Operator | May 2013 |
| 8 | Callie Oil Company LLC | | Oil & Gas Operator | Jan 2024 |
| 9 | Calvert Exploration Co | | Oil & Gas Operator | Apr 1993 |
| 10 | Cantrell Energy Corporation | Ada, OK 74820-0835 | Oil & Gas Operator | Jan 2024 |
| 11 | Cantrell Robert R | Ada, OK 74821-1433 | Oil & Gas Operator | Dec 2023 |
| 12 | Canyon Creek Energy Arkoma LLC | | Oil & Gas Operator | Jan 2024 |
| 13 | Cap Oil Company | Ada, OK 74820-4101 | Oil Operator | Dec 2023 |
| 14 | Capstone Oilfield Disposal Service LLC | Hennessey, OK 73742-0698 | Oil Operator | Dec 2019 |
| 15 | Carmichael Oil & Gas Company | Vallejo, CA 94591-5653 | Oil & Gas Operator | Apr 2014 |
| 16 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 17 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2024 |
| 18 | Center Oil Company | Ada, OK 74821-0584 | Oil Operator | May 2003 |
| 19 | Center Production Company LLC | Ada, OK 74821-0584 | Oil Operator | Jan 2024 |
| 20 | Central Ok Reclamation LLC | | Oil & Gas Operator | Jun 2014 |
| 21 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Dec 2023 |
| 22 | Cep Mid-Continent LLC | Skiatook, OK 74070 | Oil & Gas Operator | Jan 2024 |
| 23 | Chapel Operating LLC | | Oil Operator | Dec 2023 |
| 24 | Cherokee Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 25 | Cherokee Royalties & Minerals Inc | Duncan, OK 73534-0415 | Oil & Gas Operator | Jan 2024 |
| 26 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 27 | Chiles Jack Well Service | Atwood, OK 74827-0373 | Oil Operator | Apr 2014 |
| 28 | Chiles Robert Morris | Allen, OK 74825-8006 | Oil Operator | Nov 2023 |
| 29 | Chisum G H | Duncan, OK 73533 | Oil & Gas Operator | Dec 2010 |
| 30 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 31 | Clarita Operating LLC | Ada, OK 74821-2570 | Oil Operator | Jun 2022 |
| 32 | Clark Krista | Ada, OK 74820-8595 | Oil Operator | Sep 2001 |
| 33 | Clifton & Associates Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2020 |
| 34 | Coho Oil & Gas Inc | Coppell, TX 75019-8288 | Oil & Gas Operator | Mar 2015 |
| 35 | Colpitt C H Drilling Co LLC | Collinsville, OK 74021-7107 | Oil Operator | Dec 2023 |
| 36 | Colpitt Chas H Drilling Co | Collinsville, OK 74021-7105 | Oil & Gas Operator | Mar 2012 |
| 37 | Columbus Oil Company | Seminole, OK 74818-1111 | Oil & Gas Operator | Jan 2024 |
| 38 | Complete Energy Services LLC | Oklahoma City, OK 73142-3326 | Oil Operator | Aug 2022 |
| 39 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 40 | Conner Production Co LLC | Seminole, OK 74818-0349 | Oil & Gas Operator | Jan 2024 |
| 41 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 42 | Consolidated Investments | Seminole, OK 74818-0651 | Oil & Gas Operator | Jan 2024 |
| 43 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2024 |
| 44 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 45 | Cook Oil Company | Wewoka, OK 74884-0875 | Oil & Gas Operator | Sep 2015 |
| 46 | Corvin Craig | Jenks, OK 74037-0516 | Oil Operator | Feb 2012 |
| 47 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Jan 2024 |
| 48 | Crude Marketing & Trans Inc | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2017 |
| 49 | Crystal Energy Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2019 |