| 1 | Arch Bend Oil & Gas Operators, LLC | | Oil Operator | Jan 2025 |
| 2 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 3 | Australis TMS Inc. | | Oil & Gas Operator | Jun 2025 |
| 4 | Bridwell Oil Management, LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 5 | Bridwell Oil MGMT Of Al, LLC | | Oil & Gas Operator | Apr 2006 |
| 6 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 7 | Coalinga Corporation | Houston, TX 77002 | Oil & Gas Operator | May 1999 |
| 8 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Oct 2025 |
| 9 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 10 | Derrick Petroleum Inc | Bladensburg, OH 43005 | Oil & Gas Operator | Dec 2024 |
| 11 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 12 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 13 | Encore Operating Louisiana, LLC | | Oil & Gas Operator | Dec 2010 |
| 14 | Exchange Expl & Prodn Co | | Oil Operator | Oct 2023 |
| 15 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 16 | Grand Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Dec 2020 |
| 17 | Great River Oil & Gas Corp. | | Oil & Gas Operator | Sep 1998 |
| 18 | Griffin & Griffin Expl, LLC | | Oil & Gas Operator | Jul 2025 |
| 19 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 20 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 21 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 22 | Hughes & Hughes | | Oil & Gas Operator | May 1984 |
| 23 | Hughes Eastern Corporation | Ridgeland, MS 39157 | Oil & Gas Operator | Jul 2025 |
| 24 | Hughes Eastern Petroleum, LTD. | | Oil & Gas Operator | Jun 1986 |
| 25 | J. M. Huber Corp. | Houston, TX 77079 | Oil & Gas Operator | Sep 2004 |
| 26 | J. P. Van Way | | Oil & Gas Operator | Dec 2024 |
| 27 | Keck Partners | | Oil & Gas Operator | Apr 1989 |
| 28 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 29 | Land & Natural Res. Dev., Inc. | | Oil & Gas Operator | Apr 2007 |
| 30 | Lymac Exploration And Production, LLC | | Oil & Gas Operator | Jul 2016 |
| 31 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 32 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Oct 2025 |
| 33 | McClinton & 4-M Invest Inc | | Oil & Gas Operator | Aug 1992 |
| 34 | Mid-America/Hughes & Hughes | | Oil Operator | Jul 1984 |
| 35 | Miss-Lou Operating LLC | | Oil & Gas Operator | Jul 2025 |
| 36 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 37 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 38 | Paloma Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 39 | Pompano Resource Operator LLC | | Oil & Gas Operator | Jun 2025 |
| 40 | Sabine Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 1996 |
| 41 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 42 | Shana Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2002 |
| 43 | Spooner Petroleum Company | | Oil & Gas Operator | Jul 2025 |
| 44 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 45 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 46 | Stone Petroleum Corporation | | Oil & Gas Operator | Dec 1996 |
| 47 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 48 | T, F & B Oil Company, LLC | | Oil Operator | Jan 2013 |
| 49 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 50 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 51 | The Stone Oil Corporation | | Oil & Gas Operator | May 1985 |
| 52 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 53 | Tradition Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2017 |
| 54 | Transcontinental Gas P/L Corp. | | Oil & Gas Operator | Dec 2009 |
| 55 | Transcontinental Gas Pipeline Co LLC | | Oil Operator | Jan 2025 |
| 56 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Oct 2025 |
| 57 | Whittier Operating Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2007 |
| 58 | Yuma E & P Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Oct 2025 |