| 1 | H & W Marketing Company | Benbrook, TX 76126 | Oil & Gas Operator | Dec 2002 |
| 2 | H-M Resource Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2023 |
| 3 | H. C. Oil Co. | Weatherford, TX 76085 | Oil & Gas Operator | Oct 2025 |
| 4 | Hailey Energy Corporation | Wesson, MS 39191 | Gas Operator | May 2013 |
| 5 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 6 | Hampton Oil & Gas | Early, TX 76802 | Gas Operator | Feb 2012 |
| 7 | Hane Operating, Inc. | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2005 |
| 8 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 9 | Harvest Operating Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 1997 |
| 10 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Oct 2025 |
| 11 | Havens Oil Company | Early, TX 76803 | Oil & Gas Operator | Jul 2025 |
| 12 | Hay Creek Investments, L.L.C. | Santa Anna, TX 76878 | Oil Operator | Jul 2018 |
| 13 | Haynes Production Company, Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Dec 2006 |
| 14 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 15 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 16 | Herring, Casey Oil Co. | Santa Anna, TX 76878 | Oil & Gas Operator | Nov 2008 |
| 17 | Hewitt, Alan P. | Midland, TX 79702 | Oil & Gas Operator | Aug 1997 |
| 18 | HGN Operating Co. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 19 | Hipp Oil And Gas Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Oct 2025 |
| 20 | Holland Oil & Gas | Brookesmith, TX 76827 | Oil & Gas Operator | Dec 2010 |
| 21 | Home-Stake Oil & Gas Company | Plano, TX 75093 | Oil & Gas Operator | Jul 2025 |
| 22 | Hood, J. F. | Holliday, TX 76366 | Oil & Gas Operator | Apr 2010 |
| 23 | Horan, Ken L. | Cross Plains, TX 76443 | Gas Operator | May 2002 |
| 24 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 25 | HRH Energy Group Incorporated | Carrollton, TX 75006 | Oil & Gas Operator | Nov 2009 |
| 26 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 27 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 28 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Oct 2025 |
| 29 | Hughes, Bob Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | Jul 2011 |
| 30 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 31 | Hunter Oil & Gas Co. | Bangs, TX 76823 | Oil & Gas Operator | Oct 2025 |
| 32 | Huntland Properties, LTD. | Santa Anna, TX 76878 | Oil & Gas Operator | Oct 2025 |
| 33 | Huntwood Resources, LLC | Huntsville, TX 77340 | Oil Operator | Oct 2025 |