| 1 | C & T Energy Of East Canton Inc | East Canton, OH 44730 | Oil & Gas Operator | Dec 2023 |
| 2 | C T R Resources Inc | Alliance, OH 44601 | Oil & Gas Operator | Dec 2013 |
| 3 | Callander & Kimbrel Inc | Cerluean, KY 42215 | Oil & Gas Operator | Dec 1989 |
| 4 | Carless Resources, Inc. | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1997 |
| 5 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 6 | Cedar Valley Energy Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2021 |
| 7 | Cgas Exploration | Charleston, WV 25301 | Oil & Gas Operator | Dec 2006 |
| 8 | Chesapeake Appalachia LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2024 |
| 9 | Chesapeake Exploration LLC | Oklahoma City, OK 731540496 | Oil & Gas Operator | Jul 2020 |
| 10 | Chevron Appalachia, LLC | Corapolis, PA 15108 | Oil & Gas Operator | Jul 2020 |
| 11 | Clinton Gas Marketing Inc | Columbus, OH 43214 | Oil & Gas Operator | Dec 1988 |
| 12 | Clinton Petroleum Co Inc | Randolph, OH 44265 | Oil & Gas Operator | Dec 2009 |
| 13 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 14 | CNX Gas Company LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Jan 2024 |
| 15 | Collins-McGregor Operating Company | Marietta, OH 45750 | Oil & Gas Operator | Dec 2023 |
| 16 | Columbia Gas Transmission, LLC | Charleston, WV 25314 | Oil & Gas Operator | Dec 2021 |
| 17 | Consolidated Petrol Corp | Columbus, OH 43215 | Oil & Gas Operator | Dec 1995 |
| 18 | Consortium Energy LLC | North Canton, OH 44720 | Oil & Gas Operator | Dec 2023 |
| 19 | Crissinger Robert A Inc | Strongsville, OH 44136 | Oil & Gas Operator | Dec 2003 |
| 20 | Curry R D Production Co | Memphis, TN 38103 | Oil & Gas Operator | Dec 1986 |
| 21 | Cutter Exploration Inc | Oviedo, FL 32765-0476-0476 | Oil & Gas Operator | Dec 2022 |
| 22 | Cutter Oil Company | West Salem, OH 44287 | Oil & Gas Operator | Dec 2018 |