| 1 | H & O Operating Co | Odessa, TX 79764 | Oil & Gas Operator | Mar 2008 |
| 2 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Nov 2025 |
| 3 | Ham Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Feb 2000 |
| 4 | Hamm, Richard | Monahans, TX 79756 | Oil & Gas Operator | Mar 1994 |
| 5 | Hamm, Richard Inc. | Monahans, TX 79756 | Oil & Gas Operator | Nov 2025 |
| 6 | Harkey Energy Inc. | Odessa, TX 79762 | Oil & Gas Operator | Feb 2020 |
| 7 | Harvard Petroleum Corporation | Roswell, NM 88201 | Oil & Gas Operator | Dec 2004 |
| 8 | Haylan Oil Company | Midland, TX 79710 | Oil & Gas Operator | Jan 2000 |
| 9 | Heifer Production Company LLC | Houston, TX 77098 | Oil & Gas Operator | Nov 2025 |
| 10 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Jul 2025 |
| 11 | Helms Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Nov 2025 |
| 12 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 13 | Hendrix, John H. Corporation | Midland, TX 79705 | Oil & Gas Operator | Sep 2018 |
| 14 | Henry Resources LLC | Midland, TX 79703 | Oil & Gas Operator | Dec 2024 |
| 15 | Herbig, J F | Midland, TX 79701 | Oil & Gas Operator | Mar 1998 |
| 16 | Herricks Oil Co. | San Angelo, TX 76906 | Oil & Gas Operator | Jan 2010 |
| 17 | High Desert Resources, L.L.C. | Midland, TX 79704 | Oil Operator | Nov 2025 |
| 18 | Highland Production Company | Midland, TX 79701 | Oil & Gas Operator | Mar 1996 |
| 19 | Highmount Expl & Prod Texas LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 20 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Nov 2025 |
| 21 | Hillin Prod. Co. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2002 |
| 22 | Hillin, T. A. | Kerrville, TX 78028 | Oil & Gas Operator | Aug 2020 |
| 23 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 24 | Holmac Oil Company | Hobbs, NM 88240 | Oil & Gas Operator | May 1996 |
| 25 | Houghton Oil & Gas, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2009 |
| 26 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 27 | HPPC, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2023 |
| 28 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Nov 2025 |
| 29 | Hunt, Hassie Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 30 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Nov 2025 |
| 31 | Hurst Oil & Gas, Inc. | Hillsboro, TX 76645 | Oil & Gas Operator | Dec 2024 |
| 32 | Hydrocarbon Management, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 1996 |