| 1 | Ferguson Oil Company Inc | | Oil & Gas Operator | Apr 1994 |
| 2 | Fife Oil Company, Inc. | | Oil & Gas Operator | Feb 2008 |
| 3 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 4 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | Oct 2025 |
| 5 | First Energy Corporation | | Oil & Gas Operator | Jun 1993 |
| 6 | First Energy Development Corp. | | Oil & Gas Operator | Sep 2008 |
| 7 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Oct 2025 |
| 8 | Flash Gas & Oil Northeast, Inc | | Oil & Gas Operator | May 2007 |
| 9 | Flex Energy, L.L.C. | | Oil & Gas Operator | Feb 2010 |
| 10 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 11 | FMP Operating Co., LTD. PTN. | | Oil & Gas Operator | Mar 1990 |
| 12 | Forcenergy Gas Exploration Inc. | Miami, FL 33129 | Oil & Gas Operator | Aug 1996 |
| 13 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 14 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 15 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 16 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2025 |
| 17 | Franks - Arkla | | Oil & Gas Operator | Jun 1985 |
| 18 | Franks Petroleum, Inc. Et Al | | Oil & Gas Operator | Oct 1989 |
| 19 | Freeport-McMoran Inc | New Orleans, LA 70160 | Oil & Gas Operator | Apr 1997 |
| 20 | Freeport-McMoran Oil & Gas Co. | | Oil & Gas Operator | Jan 1991 |
| 21 | Future Oil & Gas, Inc. | | Oil & Gas Operator | Mar 2010 |