| 1 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Dec 2024 |
| 2 | H & O Operating Co | Odessa, TX 79764 | Oil & Gas Operator | Mar 2008 |
| 3 | Hale, Mike E. | Georgetown, TX 78628 | Oil & Gas Operator | Dec 2003 |
| 4 | Hall Oil & Gas | Coahoma, TX 79511 | Oil & Gas Operator | Dec 2024 |
| 5 | Hallwood Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2005 |
| 6 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2024 |
| 7 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 8 | Hanley Petroleum Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2017 |
| 9 | Hannathon Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2024 |
| 10 | Hanson Operating Company Inc | Roswell, NM 88202 | Oil & Gas Operator | Sep 2024 |
| 11 | Harvard Petroleum Company, LLC | Roswell, NM 88202 | Oil & Gas Operator | Dec 2024 |
| 12 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 13 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 14 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 15 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 16 | Henry Petroleum Corp. | Midland, TX 79703 | Oil & Gas Operator | Mar 2001 |
| 17 | Henry Petroleum LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2008 |
| 18 | Henry Resources LLC | Midland, TX 79703 | Oil & Gas Operator | Dec 2024 |
| 19 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 20 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 21 | Heritage Resources, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Feb 2014 |
| 22 | Heritage Standard Corporation | Dallas, TX 75206 | Oil & Gas Operator | Dec 2024 |
| 23 | Hexp Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2024 |
| 24 | Hi - Mountain Energy Corporation | Odessa, TX 79762 | Oil & Gas Operator | Dec 2024 |
| 25 | Hibernia Resources IV, LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 26 | Hibernia Resources, LLC | Houston, TX 77027 | Oil & Gas Operator | Jun 2014 |
| 27 | High Noon Resources, LLC | Allen, TX 75013 | Oil & Gas Operator | Dec 2024 |
| 28 | High Sky Partners LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2015 |
| 29 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 30 | Hopkins, T. M. Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2024 |
| 31 | Houston Energy, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 32 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 33 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 34 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2024 |