| 1 | H & S Drilling Co Inc | Frazeysburg, OH 43822-0040-0040 | Oil & Gas Operator | Dec 2016 |
| 2 | H&G Petroleum Corporation | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 3 | H&P Oil & Gas LLC | Mertzon, TX 76941 | Oil & Gas Operator | Jun 2025 |
| 4 | Haimo Oil & Gas LLC | Houston, TX 77042 | Oil & Gas Operator | Aug 2020 |
| 5 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 6 | Hallwood Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2005 |
| 7 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 8 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Jun 2025 |
| 9 | Hank Oil & Gas, Inc. | Houston, TX 77056 | Oil & Gas Operator | Oct 2023 |
| 10 | Hankamer, Curtis Corporation,The | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 11 | Hanley Petroleum Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 12 | Hannathon Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Jun 2025 |
| 13 | Hawk-Hill Operating Company, LLC | Plano, TX 75093 | Oil & Gas Operator | Jun 2009 |
| 14 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 15 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 16 | Henderson Natural Res, L.L.C. | Crozet, VA 22932 | Oil & Gas Operator | Jun 2025 |
| 17 | Henderson, Peter Oil Co. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2020 |
| 18 | Hendrix, John H. Corporation | Midland, TX 79705 | Oil & Gas Operator | Sep 2018 |
| 19 | Henry Petroleum Corp. | Midland, TX 79703 | Oil & Gas Operator | Mar 2001 |
| 20 | Henry Petroleum LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2008 |
| 21 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Jun 2025 |
| 22 | HGN Operating Co. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 23 | HGN Operating I, LLC | Abilene, TX 79604 | Oil & Gas Operator | Jun 2025 |
| 24 | Highmount Expl & Prod Texas LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2014 |
| 25 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 26 | Hobbs Energy Corporation | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2008 |
| 27 | Hughes, Bob Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | Jul 2011 |
| 28 | Hughey, W. R., Operating Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2005 |
| 29 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 30 | Hulen Operating Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2025 |
| 31 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2025 |
| 32 | Hydrocarbon Management, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 1996 |