| 1 | H&G Petroleum Corporation | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 2 | H.P. Slagel Producing Co., LLC | San Angelo, TX 76902 | Oil Operator | Oct 2025 |
| 3 | Hair, Roger D. | Post, TX 79356 | Oil & Gas Operator | Oct 2025 |
| 4 | Halvey Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Oct 2004 |
| 5 | Hamill, Claud B. Estate Of | Houston, TX 77002 | Oil & Gas Operator | Nov 1995 |
| 6 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 7 | Hardin Energy Co., Inc. | Bigfoot, TX 78005 | Oil Operator | Oct 2025 |
| 8 | Hardin, W.V. Estate | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2002 |
| 9 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 10 | Harmony Drilling Company, Inc. | Denver, CO 80222 | Oil & Gas Operator | Nov 2016 |
| 11 | Hartoil Corporation | Post, TX 79356 | Oil & Gas Operator | Oct 2025 |
| 12 | Harvard Petroleum Corporation | Roswell, NM 88201 | Oil & Gas Operator | Dec 2004 |
| 13 | Hat Oil & Gas, Inc. | Slaton, TX 79364 | Oil & Gas Operator | Feb 2002 |
| 14 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 15 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 16 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 17 | Henry Petroleum Corp. | Midland, TX 79703 | Oil & Gas Operator | Mar 2001 |
| 18 | Highpeak Energy Holdings, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 19 | Hodge T F | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2007 |
| 20 | Hondo Drilling Company | Midland, TX 79702 | Oil & Gas Operator | Nov 1996 |
| 21 | Hope Energy, L.L.C. | Snyder, TX 79549 | Oil & Gas Operator | Oct 2025 |
| 22 | Hrubetz Oil Co. | Dallas, TX 75225 | Oil Operator | Sep 1986 |
| 23 | Hrubetz Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Feb 1999 |
| 24 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Oct 2025 |
| 25 | Huff, Jack | Midland, TX 79710 | Oil & Gas Operator | Dec 2004 |
| 26 | Hydrocarbon Management, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 1996 |
| 27 | Hyquest Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2015 |