| 1 | H - A Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | Apr 2024 |
| 2 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2023 |
| 3 | Hampton Resources Corporation | Houston, TX 77010 | Oil & Gas Operator | Mar 1996 |
| 4 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Apr 2024 |
| 5 | Harvey Brothers Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Jul 2004 |
| 6 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 7 | Herd Producing Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 8 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Apr 2024 |
| 9 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 10 | Holifield Oil Company | Giddings, TX 78942 | Oil & Gas Operator | Mar 2009 |
| 11 | Hollub Production Company | Seguin, TX 78156 | Oil & Gas Operator | Jul 2000 |
| 12 | Hollub, Lambert Drilling Company | Seguin, TX 78155 | Oil & Gas Operator | Apr 2024 |
| 13 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Apr 2024 |
| 14 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 15 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Apr 2024 |
| 16 | HRH Energy Group Incorporated | Carrollton, TX 75006 | Oil & Gas Operator | Nov 2009 |