| 1 | F & J Oil LLC | Newcastle, WY 82701 | Oil & Gas Operator | Oct 2015 |
| 2 | Fairways Offshore Expl Inc | Houston, TX 77040 | Oil & Gas Operator | Mar 2016 |
| 3 | Falcon Creek Resources, Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Apr 2001 |
| 4 | Family Tree Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Feb 2013 |
| 5 | Fancher Oil LLC | Greenwood, CO 80111 | Oil & Gas Operator | Nov 2006 |
| 6 | Farleigh Oil Properties | Casper, WY 82601 | Gas Operator | Sep 1999 |
| 7 | Farnsworth & Kaiser Oil Company | Newcastle, WY 82701 | Oil & Gas Operator | Sep 2012 |
| 8 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 9 | FDF Resources | Newcastle, WY 82701 | Oil & Gas Operator | Dec 2025 |
| 10 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | Feb 2026 |
| 11 | Federated Oil & Gas Properties | Traverse City, MI 49685 | Gas Operator | Mar 2014 |
| 12 | Felmont Oil Corporation | Walnut Creek, CA 94596-3568 | Oil & Gas Operator | Feb 1990 |
| 13 | Ferguson & Bosworth | | Oil & Gas Operator | May 2007 |
| 14 | Ferguson Bob | Casper, WY 82605 | Oil Operator | May 2004 |
| 15 | Ferguson Energy Inc | Evanston, WY 82930 | Oil & Gas Operator | Dec 2025 |
| 16 | Ferguson Oil Company Inc | | Oil & Gas Operator | Apr 1994 |
| 17 | Ferreira Oil Properties LLC | Carefree, AZ 85377 | Oil Operator | Apr 2014 |
| 18 | Fidelity Exploration & Production Company | Denver, CO 80203 | Oil & Gas Operator | Jan 2026 |
| 19 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 20 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | Feb 2026 |
| 21 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Feb 2026 |
| 22 | First Energy Corporation | | Oil & Gas Operator | Jun 1993 |
| 23 | First Energy Properties | Houston, TX 77060 | Oil & Gas Operator | Dec 1986 |
| 24 | First Sourcenergy Wyoming Inc | Gillette, WY 82718 | Gas Operator | Jul 2003 |
| 25 | Five States Operating Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 26 | Flag-Redfern Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2002 |
| 27 | Flahive Oil & Gas LLC | Golden, CO 80401 | Oil Operator | Oct 1995 |
| 28 | Florida Gas Exploration Co | | Oil & Gas Operator | Feb 1985 |
| 29 | Flow Production Company | Midland, TX 79708 | Oil & Gas Operator | Mar 2005 |
| 30 | Flying J Oil & Gas Inc | North Salt Lake, UT 84054 | Oil & Gas Operator | Dec 2009 |
| 31 | FMC Corporation | Green River, WY 82935 | Oil & Gas Operator | Dec 2008 |
| 32 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 33 | Forcenergy Onshore Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 34 | Foree R L | Dallas, TX 75225 | Oil & Gas Operator | Aug 2001 |
| 35 | Foreland Resources LLC | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2025 |
| 36 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 37 | Forestar Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2017 |
| 38 | Fossil Creek Resources LLC | Arlington, TX 76011-5597 | Oil & Gas Operator | Mar 2015 |
| 39 | Fossil Energy Inc | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 40 | Foundation Energy Managment LLC | Addison, TX 74119 | Oil & Gas Operator | Nov 2025 |
| 41 | Four-A Energy LLC | Cody, WY 82414 | Oil Operator | Jan 2026 |
| 42 | Frank Louis L | Kingsville, TX 78364 | Oil & Gas Operator | Aug 2003 |
| 43 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 44 | Frickey Investment MGT Co LLC | Lakewood, CO 80215 | Oil & Gas Operator | Dec 2025 |
| 45 | Fruehauf LLC | Gaylord, MI 49735 | Oil Operator | Feb 2005 |
| 46 | Fuel Exploration Inc | Denver, CO 80295 | Oil & Gas Operator | Jan 1992 |
| 47 | Fuel Resources Development Co | Denver, CO 80202 | Oil & Gas Operator | Feb 1994 |