| 1 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 2 | H&G Petroleum Corporation | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 3 | H.A.N. Operating Incorporated | Clyde, TX 79510 | Oil & Gas Operator | Aug 2016 |
| 4 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 5 | Hale Oil & Gas Properties | Graham, TX 76450 | Oil & Gas Operator | Jul 1997 |
| 6 | Halliburton Operating Company | Plano, TX 75093 | Oil & Gas Operator | Mar 2025 |
| 7 | Halvey Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Oct 2004 |
| 8 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Mar 2025 |
| 9 | Hane Operating, Inc. | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2005 |
| 10 | Hannathon Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Mar 2025 |
| 11 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 12 | Hardrock Resources Inc. | Winters, TX 79567 | Oil & Gas Operator | Mar 2025 |
| 13 | Hartel, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Aug 1997 |
| 14 | Hartoil Corporation | Post, TX 79356 | Oil & Gas Operator | Mar 2025 |
| 15 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Mar 2025 |
| 16 | Hay Creek Investments, L.L.C. | Santa Anna, TX 76878 | Oil Operator | Jul 2018 |
| 17 | Hayes Oil & Gas Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2005 |
| 18 | Heart Land Petroleum Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 19 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 20 | Heritage Petroleum Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Mar 2025 |
| 21 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 22 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Mar 2025 |
| 23 | HGN Operating Co Inc | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 24 | HGN Operating I, LLC | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 25 | Hidalgo Oil & Exploration Corp. | New Braunfels, TX 78131 | Oil & Gas Operator | Mar 2025 |
| 26 | Hillcrest Petroleum, LLC | Midland, TX 79707 | Oil & Gas Operator | Jun 2019 |
| 27 | Hilliard Oil | Bronte, TX 76933 | Oil & Gas Operator | Mar 2008 |
| 28 | Hoelscher, Weldon | San Angelo, TX 76904 | Oil & Gas Operator | Aug 2003 |
| 29 | Hofco, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 30 | Hopewell Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 31 | Horizon Exploration Services | El Paso, TX 79922 | Oil Operator | Mar 2025 |
| 32 | Horizon Oil & Gas Co. | Dallas, TX 75221 | Oil & Gas Operator | Jan 2005 |
| 33 | Horizon Well Services, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 34 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 35 | Hudgens Operating Co., Inc. | Abilene, TX 79603 | Oil & Gas Operator | Jul 1995 |
| 36 | Hughes, Bob Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | Jul 2011 |
| 37 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 38 | Huntland Properties, LTD. | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2025 |