| 2801 | Cyclone Petroleum, Incorporated | Jenks, OK 74037 | Oil & Gas Operator | Apr 2025 |
| 2802 | Cyclops Corp | Pittsburgh, PA 15228 | Oil & Gas Operator | Dec 1992 |
| 2803 | Cygnus Producing Corporation | | Oil & Gas Operator | Feb 1990 |
| 2804 | Cymri Corporation, The | Houston, TX 77057 | Oil & Gas Operator | Mar 2008 |
| 2805 | Cymri, L.L.C. | Houston, TX 77042 | Oil & Gas Operator | Sep 2025 |
| 2806 | Cynpat Oil & Gas, Inc. | Sulphur SPGS, TX 75482 | Oil Operator | Nov 2018 |
| 2807 | Cypress Creek Production Company | Magnolia, AR 71753 | Oil Operator | Jan 2025 |
| 2808 | Cypress E & P Corporation | Leander, TX 78646 | Oil & Gas Operator | Sep 2016 |
| 2809 | Cypress Exploration Company | Tulsa, OK 74132 | Oil & Gas Operator | May 2025 |
| 2810 | Cypress Gas Pipeline Company | | Oil Operator | Dec 1998 |
| 2811 | Cypress Gas Pipeline, LLC | | Oil Operator | Sep 2019 |
| 2812 | Cypress Oil Company, Inc. | | Oil & Gas Operator | Aug 2003 |
| 2813 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2025 |
| 2814 | Cypress Partners, Inc. | Houston, TX 77068 | Oil & Gas Operator | May 1999 |
| 2815 | Cypress Production, Inc. | Azle, TX 76020 | Oil & Gas Operator | Sep 2025 |
| 2816 | Cypress Resources | | Oil & Gas Operator | Jul 2004 |
| 2817 | Cyrus, Scott | Louisa, KY 41230 | Oil Operator | Dec 2023 |
| 2818 | Cyrus, Wade T | Fort Gay, WV 25574 | Oil & Gas Operator | Dec 2013 |
| 2819 | Cytex South Texas Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 2820 | Czar Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Oct 1992 |
| 2821 | Czarniak, Dennis G. | Holland, NY 14080 | Gas Operator | Dec 2024 |
| 2822 | Czerniak, Michael A. And Cheryl A. | Lakewood, NY 14750 | Gas Operator | Dec 2024 |
| 2823 | Czesak Dairy Farm, LLC | Chaffee, NY 14030 | Gas Operator | Dec 2024 |
| 2824 | Czworka, Terry D. | Le Roy, NY 14482 | Gas Operator | Dec 2024 |