| 1 | H & H Production | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 2 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 3 | H P S Investments | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 4 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 5 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Jul 2025 |
| 6 | Haggard, E. A. | Graham, TX 76450 | Oil & Gas Operator | Apr 2001 |
| 7 | Hale Oil & Gas Properties | Graham, TX 76450 | Oil & Gas Operator | Jul 1997 |
| 8 | Hampton, Jno. W. & Son | Wichita Falls, TX 76302 | Oil & Gas Operator | Nov 1998 |
| 9 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 10 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 11 | Harper, Clint | Woodson, TX 76491 | Oil & Gas Operator | Jul 2025 |
| 12 | Harper, William E. | Woodson, TX 76491 | Oil & Gas Operator | Jul 2016 |
| 13 | Harrell Operating Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2005 |
| 14 | Harrell Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Jun 2008 |
| 15 | Harvick Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Feb 2009 |
| 16 | Harvick, George R. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 17 | Hat Oil & Gas, Inc. | Slaton, TX 79364 | Oil & Gas Operator | Feb 2002 |
| 18 | Hatcher, Ray | Burkburnett, TX 76354 | Oil & Gas Operator | Jun 2002 |
| 19 | Hawk-Hill Operating Company, LLC | Plano, TX 75093 | Oil & Gas Operator | Jun 2009 |
| 20 | Hawkins, G. A. | Graham, TX 76450 | Oil & Gas Operator | Dec 2013 |
| 21 | Hays & Croker Partnership | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 22 | HCM | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 23 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 24 | Herring, Ray | Graham, TX 76450 | Oil & Gas Operator | Jul 2014 |
| 25 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Jul 2025 |
| 26 | Hill, R.M. Operating Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 27 | Hilltex Operating Company, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2021 |
| 28 | Hoco Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 29 | Holloway Oil Company | Austin, TX 78764 | Oil & Gas Operator | Feb 2004 |
| 30 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 31 | HRH Energy Group Incorporated | Carrollton, TX 75006 | Oil & Gas Operator | Nov 2009 |
| 32 | Hughes, Dan A. Company | Beeville, TX 78104 | Oil & Gas Operator | May 2006 |
| 33 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Jul 2025 |
| 34 | Hughey, W. R., Operating Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2005 |
| 35 | Humphrey, Thos.D. Oil Prop.,Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Aug 1999 |
| 36 | Huston Minerals LP | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 37 | Huston Oil | Woodson, TX 76491 | Oil & Gas Operator | Oct 2010 |