| 101 | Natural Resource MGMT. Corp. | | Oil & Gas Operator | Jun 1989 |
| 102 | Nomeco Oil & Gas Co. | Jackson, MI 49204 | Oil & Gas Operator | Dec 1994 |
| 103 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 104 | Northern Michigan Expl Co | | Oil & Gas Operator | Jul 1990 |
| 105 | O'Meara LLC | | Oil & Gas Operator | Oct 2022 |
| 106 | O'Meara, Inc. | | Oil & Gas Operator | Dec 2006 |
| 107 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 108 | Omeara Bros. | | Oil & Gas Operator | Oct 1982 |
| 109 | Opmi Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2008 |
| 110 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 111 | Palace Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 112 | Panaco Production Co | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 113 | Panaco, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2025 |
| 114 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 115 | Pelto Oil Company | Houston, TX 77002 | Oil & Gas Operator | Nov 1998 |
| 116 | Perenco LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 117 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 118 | Petrohawk Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2005 |
| 119 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 120 | Petroleum Resource MGMT Co TX | | Oil & Gas Operator | Sep 2020 |
| 121 | Petsec Energy Inc. | | Oil & Gas Operator | Sep 2012 |
| 122 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 123 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 124 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 125 | Prairie Producing Company | | Oil & Gas Operator | Dec 1992 |
| 126 | Prime Natural Resources, Inc. | Houston, TX 77042 | Oil & Gas Operator | Jun 2007 |
| 127 | Probe Offshore, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 128 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 129 | PXP Louisiana L.L.C. | | Oil & Gas Operator | Nov 2010 |
| 130 | Ranger Holdings Co | | Oil & Gas Operator | Jul 1993 |
| 131 | Ranger Oil Company | Canada, 00100 | Oil & Gas Operator | Sep 2001 |
| 132 | Ranger, Inc. | | Oil & Gas Operator | Dec 1986 |
| 133 | Republic Mineral Corporation | | Oil & Gas Operator | Sep 1987 |
| 134 | Ripco | | Oil & Gas Operator | Jul 1986 |
| 135 | Rooster Petroleum, LLC | | Oil & Gas Operator | Feb 2011 |
| 136 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 137 | Seahawk Oil & Gas Company | Dallas, TX 75379 | Oil & Gas Operator | Aug 2007 |
| 138 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 139 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 140 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 141 | Source Petroleum Inc. | San Antonio, TX 78265 | Oil & Gas Operator | Feb 2026 |
| 142 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 143 | Southern Natural Gas Company LLC | | Oil & Gas Operator | Nov 2024 |
| 144 | Strata Energy, Inc. | | Oil & Gas Operator | Sep 1983 |
| 145 | Summit Energy Company | | Oil & Gas Operator | Mar 2009 |
| 146 | TDC Energy Corporation | | Oil & Gas Operator | Dec 2001 |
| 147 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 148 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 149 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 150 | Texoil Company | | Oil & Gas Operator | Dec 2000 |
| 151 | The Harvest Group, LLC | | Oil & Gas Operator | May 2011 |
| 152 | The Meridian Res. & Exp. LLC | | Oil & Gas Operator | Sep 2010 |
| 153 | Tiger Oil Company | Dallas, TX 75221 | Oil & Gas Operator | May 2007 |
| 154 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 155 | Torch Oil & Gas Company | Houston, TX 77010 | Oil & Gas Operator | Aug 1997 |
| 156 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 157 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 158 | Union Expl. Partners, LTD. | | Oil & Gas Operator | Aug 1990 |
| 159 | United Gas Pipe Line Co. | | Oil Operator | Aug 1993 |
| 160 | Unocal Exploration Corporation | Houston, TX 77001 | Oil & Gas Operator | May 1992 |
| 161 | Virtex Petroleum Company, Inc. | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Jan 2008 |
| 162 | Walter T. Lanaux | | Oil & Gas Operator | Nov 1990 |
| 163 | WCC Energy Group LLC | | Oil & Gas Operator | Dec 2024 |
| 164 | Weaver Exploration Company | | Oil & Gas Operator | Jun 1991 |
| 165 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Feb 2026 |
| 166 | Wood Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Jun 1999 |
| 167 | Yuma E & P Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 168 | Yuma Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Aug 2002 |