| 1 | H - A Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2024 |
| 2 | Hampton Resources Corporation | Houston, TX 77010 | Oil & Gas Operator | Mar 1996 |
| 3 | Hankamer, Curtis Corporation,The | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 4 | Hardin Energy Co., Inc. | Bigfoot, TX 78005 | Oil Operator | Dec 2024 |
| 5 | Hardin, W.V. Estate | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2002 |
| 6 | Harrison Oil & Gas Inc | Houston, TX 77019 | Oil & Gas Operator | Oct 2024 |
| 7 | Harrison, Sam G. Oil, Inc. | Houston, TX 77019 | Oil & Gas Operator | Nov 2019 |
| 8 | Henry Petroleum Corp. | Midland, TX 79703 | Oil & Gas Operator | Mar 2001 |
| 9 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 10 | Higher Standard Oil Company,Inc. | Frisco, TX 75034 | Oil Operator | Dec 2024 |
| 11 | Hillin, T. A. | Kerrville, TX 78028 | Oil & Gas Operator | Aug 2020 |
| 12 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 13 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 14 | Holifield Oil Company | Giddings, TX 78942 | Oil & Gas Operator | Mar 2009 |
| 15 | Holley Oil Company, LLC | Chappell Hill, TX 77426 | Oil & Gas Operator | Dec 2024 |
| 16 | Hollub, Lambert Drilling Company | Seguin, TX 78155 | Oil & Gas Operator | Dec 2024 |
| 17 | Hopkins Engineering, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 1996 |
| 18 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 19 | Houston Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 20 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 21 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 22 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Dec 2024 |
| 23 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 24 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |