1 | H. & N. Operating Co., Inc. | | Oil & Gas Operator | Oct 1997 |
2 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
3 | Harkins And Co., Et Al | | Oil & Gas Operator | Dec 1980 |
4 | Harmony Producing Co Inc | | Oil & Gas Operator | Dec 1995 |
5 | Harrington Oil Inc. | | Oil & Gas Operator | Apr 1978 |
6 | Harris & Payne-Randel Drilling | | Oil & Gas Operator | Dec 1989 |
7 | Harrison Drilling Co | | Oil & Gas Operator | Mar 1981 |
8 | Hassie Hunt Expl. Company | Dallas, TX 75201 | Oil & Gas Operator | Aug 2008 |
9 | Hawkeye Drilling Co. | Waskom, TX 75692 | Oil & Gas Operator | Feb 2023 |
10 | Hayes & Assoc Inc | | Oil & Gas Operator | Oct 1991 |
11 | Herlihy, John D. | | Oil & Gas Operator | May 1997 |
12 | Heron Operating, LLC | | Oil & Gas Operator | Oct 2024 |
13 | High Plains Operating Co | | Oil & Gas Operator | Nov 1993 |
14 | High-Line Production Services LLC | | Oil & Gas Operator | Oct 2024 |
15 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
16 | Holleman & Parks Oil & Gas Inc | | Oil & Gas Operator | May 1995 |
17 | Hollingsworth & Assoc | | Oil Operator | Feb 1987 |
18 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
19 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
20 | Hughes & Hughes | | Oil & Gas Operator | May 1984 |
21 | Hughes & New Oil Co. | | Oil Operator | Jul 1993 |
22 | Hughes Eastern Corporation | Ridgeland, MS 39157 | Oil & Gas Operator | Jun 2024 |
23 | Humble Oil & Refining Co. | Houston, TX 77252 | Oil & Gas Operator | Jan 2000 |
24 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
25 | Huseman Oil International, Inc. | | Oil & Gas Operator | Feb 1992 |