| 1 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Aug 2024 |
| 2 | Campbell Wells Corporation | | Oil Operator | Dec 1995 |
| 3 | Canada Crown Inv Corporation | | Oil & Gas Operator | Apr 1998 |
| 4 | Canlan Oil Company | | Oil & Gas Operator | Mar 1992 |
| 5 | Cantium, LLC | | Oil & Gas Operator | Jul 2024 |
| 6 | Carl Oil & Gas Co. | Bakersfield, CA 93309 | Oil & Gas Operator | Dec 1995 |
| 7 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 8 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 9 | Castlerock Oil Company, Inc. | Addison, TX 75001 | Oil & Gas Operator | Feb 2006 |
| 10 | Cedyco Corporation | Houston, TX 77227 | Oil & Gas Operator | Nov 2008 |
| 11 | Century Mineral Corporation | | Oil & Gas Operator | Dec 1990 |
| 12 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2024 |
| 13 | Charles A. O'Niell, Jr. | | Oil & Gas Operator | Apr 2001 |
| 14 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2024 |
| 15 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2024 |
| 16 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Nov 2024 |
| 17 | Christeve Oil Company, Inc. | Houston, TX 77068 | Oil & Gas Operator | Dec 2022 |
| 18 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 19 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 20 | Clovelly Oil Co., Inc. | | Oil & Gas Operator | Dec 2008 |
| 21 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 22 | CMS Oil And Gas Company | Jackson, MI 49201 | Oil & Gas Operator | Oct 2002 |
| 23 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 24 | Cockrell Oil Corporation | Houston, TX 77002-7348 | Oil & Gas Operator | Feb 2001 |
| 25 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2024 |
| 26 | Collet Oil Ventures, Inc. | Denver, CO 80217 | Oil & Gas Operator | Jun 2004 |
| 27 | Colt Production Corp. Inc. | | Oil & Gas Operator | Jul 1996 |
| 28 | Columbia Gulf Transmission Co. | | Oil Operator | Dec 2014 |
| 29 | Columbia Gulf Transmission Company, LLC | | Oil Operator | Jul 2024 |
| 30 | Comstock Oil & Gas -- La, Inc. | | Oil & Gas Operator | Mar 2005 |
| 31 | Concord Resources, LLC | | Oil & Gas Operator | Nov 2000 |
| 32 | Conquest Exploration Co. | | Oil & Gas Operator | Mar 1992 |
| 33 | Consolidated Resources Inc | | Oil & Gas Operator | May 2004 |
| 34 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 35 | Cox Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 36 | Crosstex Lig, LLC | | Oil Operator | Mar 2014 |
| 37 | CSX Oil & Gas Corporation | Houston, TX 77210-4326 | Oil & Gas Operator | Mar 1993 |
| 38 | CX Operating, Inc. | | Oil & Gas Operator | Oct 2023 |
| 39 | Cypress Gas Pipeline Company | | Oil Operator | Dec 1998 |
| 40 | Cypress Gas Pipeline, LLC | | Oil Operator | Sep 2019 |