| 1 | H & W Marketing Company | Benbrook, TX 76126 | Oil & Gas Operator | Dec 2002 |
| 2 | H&G Petroleum Corporation | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 3 | Hailey Energy Corporation | Wesson, MS 39191 | Gas Operator | May 2013 |
| 4 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 5 | Harvest Operating Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 1997 |
| 6 | Havens Oil Company | Early, TX 76803 | Oil & Gas Operator | Dec 2024 |
| 7 | Herzfeld Fabricators Inc | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2017 |
| 8 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 9 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Mar 2025 |
| 10 | Holcomb Enterprises | Clyde, TX 79510 | Oil & Gas Operator | Aug 2003 |
| 11 | Hopkins, T. M. Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 12 | Horn Energy | Eastland, TX 76448 | Oil & Gas Operator | Mar 2025 |
| 13 | Howard, Anthony E. F. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2001 |
| 14 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 15 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 16 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Mar 2025 |
| 17 | Hudson Brothers Mining Co., Inc. | Cisco, TX 76437 | Oil & Gas Operator | Jun 1994 |
| 18 | Hughes, Bob Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | Jul 2011 |