| 1 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 2 | Haddad Boynton, LLC | Jonesville, TX 75659 | Oil Operator | Dec 2024 |
| 3 | Halcon Resources Operating, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2013 |
| 4 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2024 |
| 5 | Hanna Oil And Gas Company | Fort Smith, AR 72901 | Oil & Gas Operator | Sep 2024 |
| 6 | Hardey Co., The | Shreveport, LA 71107 | Oil & Gas Operator | Dec 2024 |
| 7 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Dec 2024 |
| 8 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 9 | Hawkeye Drilling Co. | Waskom, TX 75692 | Oil & Gas Operator | Feb 2023 |
| 10 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 11 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 12 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 13 | Herbst Resources, Inc. | Mandeville, LA 70448 | Oil & Gas Operator | Aug 2003 |
| 14 | Heritage Operating Co., Inc. The | Stafford, TX 77497 | Oil & Gas Operator | May 1997 |
| 15 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 16 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Dec 2024 |
| 17 | Higher Standard Oil Company,Inc. | Frisco, TX 75034 | Oil Operator | Dec 2024 |
| 18 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 19 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 20 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 21 | Hollandsworth & Travis | Longview, TX 75606 | Oil & Gas Operator | Mar 2001 |
| 22 | Hopewell Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 23 | Hopkins Engineering, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 1996 |
| 24 | Howell & Sandlin, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2001 |
| 25 | Howell Oil & Gas, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2019 |
| 26 | HPC Operating, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Mar 2008 |
| 27 | HRB Operating Company Inc | Bridgeport, TX 76426 | Oil & Gas Operator | Dec 2024 |
| 28 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Dec 2024 |
| 29 | Huggs Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2003 |
| 30 | Hughes Supplies, Inc. | Greenwood, LA 71033 | Oil & Gas Operator | Jul 2019 |
| 31 | Hughey, W. R., Operating Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2005 |
| 32 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 33 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 34 | Hurley Petroleum Corporation | Baton Rouge, LA 70821 | Oil & Gas Operator | Feb 2000 |
| 35 | Hydrocarbon Lease Management LTD | Addison, TX 75001 | Oil & Gas Operator | Jul 2002 |