| 1 | H - A Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | Oct 2025 |
| 2 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Oct 2025 |
| 3 | Hankamer, Curtis Corporation,The | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 4 | Harvey Brothers Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Jul 2004 |
| 5 | Hazelett Oil Company, Inc. | Dale, TX 78616 | Oil & Gas Operator | Sep 2005 |
| 6 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 7 | Hellums, Harold | Cedar Creek, TX 78612 | Oil & Gas Operator | Mar 2008 |
| 8 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Oct 2025 |
| 9 | Hollub Production Company | Seguin, TX 78156 | Oil & Gas Operator | Jul 2000 |
| 10 | Hollub, Lambert Drilling Company | Seguin, TX 78155 | Oil & Gas Operator | Oct 2025 |
| 11 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Oct 2025 |
| 12 | Howell Drilling, Inc. | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2003 |
| 13 | Hrbacek Oil Corp. | La Grange, TX 78945 | Oil & Gas Operator | Feb 2004 |
| 14 | HRH Energy Group Incorporated | Carrollton, TX 75006 | Oil & Gas Operator | Nov 2009 |
| 15 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Oct 2025 |
| 16 | Hughey, W. R., Operating Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2005 |
| 17 | Hulsey Oil Company | Dallas, TX 75205 | Oil & Gas Operator | Aug 1999 |