| 1 | Alpine Gas Operator, LLC | | Oil & Gas Operator | Jun 2024 |
| 2 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 3 | Barton Oil, LLC | | Oil & Gas Operator | Jan 2014 |
| 4 | Bean Resources, Inc. | | Oil & Gas Operator | Aug 2006 |
| 5 | Browning & Welch, Inc. | | Oil & Gas Operator | Mar 2005 |
| 6 | Chevron U. S. A., Inc. -TX | | Oil & Gas Operator | Dec 2004 |
| 7 | CWF Associates, LTD. | | Oil & Gas Operator | Apr 1988 |
| 8 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | Apr 2025 |
| 9 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 10 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 11 | Lamar Energy LLC | | Oil & Gas Operator | Jan 2025 |
| 12 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 13 | Midstate Energy Inc | | Oil & Gas Operator | Aug 2017 |
| 14 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 15 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 16 | Penn VIrginia Oil & Gas Corp | Houston, TX 77024 | Oil & Gas Operator | Dec 2023 |
| 17 | Pennzoil Expl & Prod Co -TX | | Oil & Gas Operator | May 1993 |
| 18 | Petrotx Operating, LLC | Kingwood, TX 77339 | Oil & Gas Operator | Apr 2025 |
| 19 | Rockland Oil Company | Addison, TX 75001 | Oil & Gas Operator | Jan 2025 |
| 20 | Spooner Petroleum Company | | Oil & Gas Operator | Jan 2025 |
| 21 | Sun Oil Company | Arlington, TX 76006 | Oil & Gas Operator | Dec 2021 |
| 22 | Tellus Operating Group, LLC | | Oil & Gas Operator | Jan 2025 |
| 23 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 24 | Venture Oil & Gas, Inc. | Laurel, MS 39440 | Oil & Gas Operator | Jan 2025 |
| 25 | Will-Drill Production Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Apr 2025 |