| 1 | Calyx Energy III LLC | Tulsa, OK 74136-4226 | Oil & Gas Operator | Jun 2025 |
| 2 | Canaan Resources LLC | Oklahoma City, OK 73118-1126 | Gas Operator | Oct 2023 |
| 3 | Canaan Resources X LLC | Oklahoma City, OK 73103-4925 | Oil & Gas Operator | Sep 2024 |
| 4 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Jul 2025 |
| 5 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 6 | Casselman Charles Jack | Okmulgee, OK 74447-4265 | Oil & Gas Operator | Apr 2020 |
| 7 | CBL Resources LLC | Tulsa, OK 74136-6308 | Oil & Gas Operator | Jun 2025 |
| 8 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2025 |
| 9 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 10 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 11 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 12 | Clifton Consulting Inc | Piedmont, OK 73078-0180 | Gas Operator | Jun 2025 |
| 13 | Cloer VIrgil R | Oklahoma City, OK 73121 | Oil & Gas Operator | Apr 1993 |
| 14 | CMX Inc Of Kansas | Wichita, KS 67206-2561 | Oil & Gas Operator | Jul 2025 |
| 15 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Oct 2025 |
| 16 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 17 | Concorde Resources Corporation | Eufaula, OK 74432 | Oil & Gas Operator | May 2025 |
| 18 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Oct 2025 |
| 19 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 20 | Cordillera Energy Partners LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 21 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 22 | Cowden SR Lester L | Oklahoma City, OK 73118-4011 | Oil & Gas Operator | Sep 1999 |
| 23 | Cox Edwin L & R Berry | Dallas, TX 75202 | Oil & Gas Operator | Apr 2015 |
| 24 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |
| 25 | Cudd Operating Corp. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 26 | CW Investments | Okmulgee, OK 74447-4026 | Oil & Gas Operator | Jun 2025 |
| 27 | Cypress Exploration Company | Tulsa, OK 74132 | Oil & Gas Operator | Jun 2025 |