| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H & N Operating Co. Inc. | Oil & Gas Operator | Oct 1997 | |
| 2 | H. A. Harper | Oil Operator | Dec 1982 | |
| 3 | Hansen Oil Corporation | Shreveport, LA 71106 | Oil Operator | Apr 2003 |
| 4 | Hassie Hunt Expl. Co. | Oil & Gas Operator | Aug 2008 | |
| 5 | Hogan Exploration, Inc. | Oil & Gas Operator | Mar 2000 | |
| 6 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 7 | Hughes & Hughes | Oil & Gas Operator | May 1984 | |
| 8 | Hughes & New-D. Braswell | Oil & Gas Operator | Jun 1983 | |
| 9 | Hughes Denny Offshore Expl Inc | Oil & Gas Operator | Nov 1988 | |
| 10 | Hughes Eastern Corporation | Ridgeland, MS 39157 | Oil & Gas Operator | Jan 2026 |
| 11 | Hughes Eastern Petroleum, LTD | Oil & Gas Operator | Jun 1986 | |
| 12 | Hughes-Denny Petroleum Co.,Inc | Oil & Gas Operator | Dec 1987 | |
| 13 | Hunt Oil Co., Et Al | Oil & Gas Operator | Nov 1992 | |
| 14 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 15 | Hurley Oil And Gas Company | Oil & Gas Operator | Jan 1997 | |
| 16 | Hyatt Exploration, Inc. | Oil Operator | Jul 1995 |