| 1 | Fieldwood Energy Offshore LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 2 | Five States Energy Company | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 3 | Five States Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Feb 2008 |
| 4 | Flash Gas & Oil Southwest, Inc. | Mandeville, LA 70470 | Oil & Gas Operator | Oct 2019 |
| 5 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 6 | FMP Operating Co., LTD. PTN. | | Oil & Gas Operator | Mar 1990 |
| 7 | Fontenot Pet Land Services, Inc. | | Oil & Gas Operator | Aug 2002 |
| 8 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 9 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 10 | Four Seasons, Inc. | | Oil & Gas Operator | Jun 1983 |
| 11 | Frank Spooner | | Oil & Gas Operator | Mar 1984 |
| 12 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 13 | French Production Incorporated | Houston, TX 77086 | Oil & Gas Operator | Dec 1997 |