| 101 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 102 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 103 | Rincon Petroleum Corporation | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Oct 2025 |
| 104 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 105 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 106 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 107 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 108 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 109 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 110 | Saxet Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 111 | Standard Resources Corp. | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 112 | Stillwater Petroleum Company | College Sta, TX 77845 | Oil & Gas Operator | Nov 1997 |
| 113 | Suemaur Expl. & Prod., LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2024 |
| 114 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 115 | Synergy Oil & Gas, Inc. (A) | Houston, TX 77024 | Oil & Gas Operator | Aug 2001 |
| 116 | Synergy Production Company | Houston, TX 77024 | Oil & Gas Operator | Jan 1996 |
| 117 | T - C Oil Company | Refugio, TX 78377 | Oil & Gas Operator | Jan 2012 |
| 118 | T-C Oil Company, LLC | Refugio, TX 78377 | Oil & Gas Operator | Oct 2025 |
| 119 | Tare Resources, LLC | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Oct 2025 |
| 120 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Oct 2025 |
| 121 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 122 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Oct 2025 |
| 123 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 124 | Texron Operating, LLC | Bulverde, TX 78163 | Oil & Gas Operator | Oct 2025 |
| 125 | Tidewater Minerals Corporation | Orange Grove, TX 78372 | Oil & Gas Operator | Oct 2025 |
| 126 | TR Offshore, LLC | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Oct 2025 |
| 127 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 128 | Tryall, Inc | Porter, TX 77365 | Oil & Gas Operator | Oct 2025 |
| 129 | United Oil & Minerals L. P. | Austin, TX 78746 | Oil & Gas Operator | Jun 2003 |
| 130 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 131 | Vista Resources, Inc. (A) | Midland, TX 79701 | Oil & Gas Operator | Feb 2000 |
| 132 | Voight Oil Company | Tyler, TX 75703 | Oil & Gas Operator | Aug 2001 |
| 133 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 134 | Wainoco Oil & Gas Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2005 |
| 135 | Wallis Energy, Inc. | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 136 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 137 | Warwick Oil & Gas, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 1993 |
| 138 | Western Gulf Oil & Gas, LLC | Bishop, TX 78343 | Oil & Gas Operator | Oct 2025 |
| 139 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Oct 2025 |
| 140 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 141 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 142 | Whittington Operating Company | Houston, TX 77069 | Oil & Gas Operator | Oct 2025 |
| 143 | Wing Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2000 |
| 144 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 145 | WRT Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | May 1998 |
| 146 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |