| 1 | Hadaway Consult And Engineer,LLC | Canadian, TX 79014 | Oil & Gas Operator | Oct 2025 |
| 2 | Haimo Oil & Gas LLC | Houston, TX 77042 | Oil & Gas Operator | Aug 2020 |
| 3 | Hall Oil & Gas | Coahoma, TX 79511 | Oil & Gas Operator | Oct 2025 |
| 4 | Hall Oil And Gas LLC | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 5 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 6 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 7 | Hankamer, Curtis Corporation,The | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 8 | Hannathon Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 9 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 10 | Harding Well Service Co. | Coahoma, TX 79511 | Oil & Gas Operator | Aug 2003 |
| 11 | Harmonia Petroleum Corporation | Missouri City, TX 77459 | Oil & Gas Operator | May 2017 |
| 12 | Harmony Drilling Company, Inc. | Denver, CO 80222 | Oil & Gas Operator | Nov 2016 |
| 13 | Hartoil Corporation | Post, TX 79356 | Oil & Gas Operator | Oct 2025 |
| 14 | Harvard Petroleum Corporation | Roswell, NM 88201 | Oil & Gas Operator | Dec 2004 |
| 15 | Hat Oil & Gas, Inc. | Slaton, TX 79364 | Oil & Gas Operator | Feb 2002 |
| 16 | Hawkeye Transmission Company | Dallas, TX 75244 | Oil & Gas Operator | Jun 2000 |
| 17 | Hayabusa Energy USA, LLC | Pampa, TX 79065 | Oil & Gas Operator | Oct 2025 |
| 18 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 19 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Jun 2025 |
| 20 | Helms Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 21 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 22 | Hendrix, John H. Corporation | Midland, TX 79705 | Oil & Gas Operator | Sep 2018 |
| 23 | Henry Petroleum Corp. | Midland, TX 79703 | Oil & Gas Operator | Mar 2001 |
| 24 | Henry Petroleum LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2008 |
| 25 | Herv Oil, LLC | Oklahoma City, OK 73116 | Oil Operator | Jun 2025 |
| 26 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Oct 2025 |
| 27 | Hexp Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 28 | Hibernia Resources IV, LLC | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 29 | High Desert Resources, L.L.C. | Midland, TX 79704 | Oil Operator | Oct 2025 |
| 30 | Highmount Expl & Prod Texas LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 31 | Highpeak Energy Holdings, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 32 | Hillin Simon/Prime Expl., L.C. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 33 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 34 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 35 | Hog Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 36 | Holly Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2008 |
| 37 | Hopkins, T. M. Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 38 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 39 | Hrubetz Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Feb 1999 |
| 40 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |