| 1 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 2 | Hanley Petroleum Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 3 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 4 | Headington Energy Partners, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 5 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 6 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 7 | Helms Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 8 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 9 | Henry Resources LLC | Midland, TX 79703 | Oil & Gas Operator | Dec 2024 |
| 10 | Heritage Resources, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Feb 2014 |
| 11 | Heritage Standard Corporation | Dallas, TX 75206 | Oil & Gas Operator | Dec 2024 |
| 12 | High Sky Oil & Gas | Midland, TX 79705 | Oil & Gas Operator | Jun 2008 |
| 13 | Highland Production Company | Midland, TX 79701 | Oil & Gas Operator | Mar 1996 |
| 14 | Hillin Prod. Co. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2002 |
| 15 | Hillin, T. A. | Kerrville, TX 78028 | Oil & Gas Operator | Aug 2020 |
| 16 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Dec 2024 |
| 17 | Hopper, Harlan | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 18 | Hopper, Thornton Co. | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 19 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 20 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 21 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2024 |