| 1 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 2 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2025 |
| 3 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 4 | Apache Shelf, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jan 2014 |
| 5 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 6 | Atinum Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 7 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 8 | Chartex Petroleum Company | Houston, TX 77070 | Oil & Gas Operator | Aug 2000 |
| 9 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 10 | Coastland Operations, LLC | Dallas, TX 75287 | Oil & Gas Operator | Dec 2025 |
| 11 | Davis Gulf Coast, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 12 | Davis Petroleum Corp. | Houston, TX 77027 | Oil & Gas Operator | Dec 2025 |
| 13 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 14 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 15 | Dominion Production Company, LLC | Tampa, FL 33606 | Oil & Gas Operator | Dec 2025 |
| 16 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 17 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 18 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 19 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 20 | Hall-Houston Oil Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 21 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 22 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 23 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 24 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 25 | Llog Exploration Offshore, Inc. | Covington, LA 70433 | Oil & Gas Operator | Aug 2004 |
| 26 | Llog Exploration Texas, L.P. | Covington, LA 70433 | Oil & Gas Operator | Dec 2025 |
| 27 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 28 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 29 | Maritech Resources, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2009 |
| 30 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 31 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 32 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 33 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 34 | Osprey Petroleum Company, Inc. | Manvel, TX 77578 | Oil & Gas Operator | May 2020 |
| 35 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 36 | Patrick Pet. Corp. Of Michigan | Houston, TX 77227 | Oil & Gas Operator | Aug 1995 |
| 37 | Petrotex Engineering Company | Cypress, TX 77429 | Oil & Gas Operator | Dec 2025 |
| 38 | PG&E Resources Offshore Company | Dallas, TX 75206 | Oil & Gas Operator | Oct 1994 |
| 39 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 40 | Rutherford Oil Corporation | Houston, TX 77046 | Oil & Gas Operator | Jun 2019 |
| 41 | Samedan Oil Corp. -Offshore Div. | Houston, TX 77067 | Oil & Gas Operator | Dec 2002 |
| 42 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 43 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 44 | Shell Offshore Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 2008 |
| 45 | Spinnaker Exploration Co.,L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Nov 2005 |
| 46 | Sterling Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2015 |
| 47 | Tana Oil And Gas Corporation | Irving, TX 75062 | Oil & Gas Operator | Mar 2000 |
| 48 | Texas Offshore Operations, LLC | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Dec 2025 |
| 49 | TR Offshore, LLC | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Dec 2025 |
| 50 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 51 | Vector Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Dec 2025 |
| 52 | Vtex Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |