| 1 | H&S Production, LLC | | Oil Operator | Nov 2024 |
| 2 | H. E. Sutton | | Oil & Gas Operator | Jan 1990 |
| 3 | Hardy Oil & Gas USA Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1996 |
| 4 | Hassie Hunt Expl. Company | Dallas, TX 75201 | Oil & Gas Operator | Aug 2008 |
| 5 | Hawkins Oil & Gas, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 6 | Helena Production Corp | | Oil & Gas Operator | Dec 1991 |
| 7 | Herd Producing Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 8 | HGH Energy, Inc. | | Oil & Gas Operator | Jun 2001 |
| 9 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 10 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 11 | Hinton Well Servicing, Inc. | | Oil Operator | Feb 2008 |
| 12 | Huggs & McConathy,Et Al | | Oil & Gas Operator | Dec 1985 |
| 13 | Huggs Inc. & Bec, Et Al | | Oil & Gas Operator | Feb 1998 |
| 14 | Huggs Incorporated, Et Al | | Oil & Gas Operator | Feb 1998 |
| 15 | Hughes & Hughes | | Oil & Gas Operator | May 1984 |
| 16 | Hughes Denny Offshore Expl Inc | | Oil & Gas Operator | Nov 1988 |
| 17 | Hughes Eastern Petroleum, LTD. | | Oil & Gas Operator | Jun 1986 |
| 18 | Hughes-Denny Petroleum Co.,Inc | | Oil & Gas Operator | Dec 1987 |
| 19 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 20 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 21 | Hurley Oil And Gas Company | | Oil & Gas Operator | Jan 1997 |
| 22 | Hurley Petroleum Corporation | Baton Rouge, LA 70821 | Oil & Gas Operator | Feb 2000 |
| 23 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |