| 101 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 102 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 103 | Liberty Oil & Gas Corp | Olney, IL 62450-2489 | Oil & Gas Operator | Dec 2021 |
| 104 | Liberty Resources, Inc. | | Oil & Gas Operator | Dec 2024 |
| 105 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Feb 2026 |
| 106 | Llog Expl. Co. | Metairie, LA 70005 | Oil & Gas Operator | Jan 2003 |
| 107 | Louisiana Intrastate Gas Corp. | | Oil Operator | Feb 1994 |
| 108 | LTX Productions, Inc. | Houston, TX 77095 | Oil & Gas Operator | Jul 2008 |
| 109 | Lyons, Hilliard & Watson, Inc. | | Oil & Gas Operator | Jan 1989 |
| 110 | M. L. Mayfield | | Oil & Gas Operator | Oct 1990 |
| 111 | M. L. Mayfield Co. | | Oil & Gas Operator | Aug 1991 |
| 112 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 113 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Feb 2026 |
| 114 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 115 | Martin Exploration Co. | | Oil & Gas Operator | Apr 1986 |
| 116 | Meridian Resources (USA) Inc. | | Oil & Gas Operator | Aug 2024 |
| 117 | Mid-America Resources, Inc. | | Oil & Gas Operator | Feb 2008 |
| 118 | Miss-Lou Operating LLC | | Oil & Gas Operator | Dec 2025 |
| 119 | Mission River Systems, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Feb 2026 |
| 120 | Mobil Oil E & P Southeast Inc | | Oil & Gas Operator | Sep 2013 |
| 121 | Mongrue Oil Company, Inc. | | Oil & Gas Operator | Oct 1999 |
| 122 | Monterey Pipeline Co. | | Oil Operator | Aug 1993 |
| 123 | New York Petroleum Corp. | | Oil & Gas Operator | Nov 1982 |
| 124 | Nomeco Oil & Gas Co. | Jackson, MI 49204 | Oil & Gas Operator | Dec 1994 |
| 125 | Norcen Explorer, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 1998 |
| 126 | Nova Gas & Oil, Inc. | | Oil & Gas Operator | Aug 1997 |
| 127 | Ody Oil Corp. | | Oil & Gas Operator | Oct 1994 |
| 128 | Offshore Oil & Gas Inc | Houston, TX 77063 | Oil & Gas Operator | Sep 1994 |
| 129 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 130 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 131 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 132 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | May 2025 |
| 133 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2026 |
| 134 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 135 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | Dec 2025 |
| 136 | Plymouth Resource GRP 1998 LLC | | Oil & Gas Operator | Mar 2000 |
| 137 | Plymouth Resources Group II Inc | | Oil & Gas Operator | May 2007 |
| 138 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 139 | Prospera Energy, Inc. | | Oil & Gas Operator | Dec 2005 |
| 140 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 141 | Quintana Production Co. | | Oil & Gas Operator | Feb 1987 |
| 142 | Ranger Oil Company | Canada, 00100 | Oil & Gas Operator | Sep 2001 |
| 143 | Red Wing Oil & Gas, Inc. | | Oil Operator | Sep 1990 |
| 144 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 145 | Robert D Valerius Inc. | | Oil Operator | Mar 1996 |
| 146 | Robert G Cox & Assoc La Inc. | | Oil & Gas Operator | Jun 1994 |
| 147 | Rozel Operating Company | | Oil & Gas Operator | Oct 2014 |
| 148 | Sam Jones & Assoc Prod Div Inc | | Oil & Gas Operator | Feb 1999 |
| 149 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 150 | Santa Fe-Andover Oil Co | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2000 |
| 151 | Sante Fe Minerals | | Oil & Gas Operator | Dec 1987 |
| 152 | Settco Oil & Gas | | Oil & Gas Operator | May 1994 |
| 153 | Shell Oil Co. | Houston, TX 77001 | Oil & Gas Operator | Jun 1985 |
| 154 | Sierra Production Company | | Oil & Gas Operator | May 1986 |
| 155 | Sound Resources Corporation | | Oil & Gas Operator | Dec 2003 |
| 156 | South Oak Production Company | | Oil & Gas Operator | Jun 2010 |
| 157 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 158 | SRP Production Corp. | | Oil & Gas Operator | Nov 1997 |
| 159 | Stone Petroleum Corporation | | Oil & Gas Operator | Dec 1996 |
| 160 | Sugar Bowl Industrial Gas Corp | | Oil Operator | Dec 1983 |
| 161 | Sun Exploration And Production Co | | Oil & Gas Operator | Jan 1990 |
| 162 | T, F & B Oil Company, LLC | | Oil Operator | Jan 2013 |
| 163 | Taylor Energy Co. | | Oil & Gas Operator | May 1991 |
| 164 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | Feb 2026 |
| 165 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 166 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 167 | Texas Crude Exploration Inc | Fort Worth, TX 76116 | Oil & Gas Operator | Aug 1992 |
| 168 | Texas Crude Oil Co. | | Oil & Gas Operator | Dec 1984 |
| 169 | Texas Crude Oil, Inc. | | Oil & Gas Operator | Dec 1984 |
| 170 | Texas Crude Operator, Inc. | Houston, TX 77098 | Oil & Gas Operator | Aug 2017 |
| 171 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 172 | Texas Gas Transmission Corp. | | Oil Operator | Aug 2003 |
| 173 | Texas Gas Transmission, LLC | Owensboro, KY 42301 | Oil & Gas Operator | Dec 2024 |
| 174 | Texas Ind. Exploration, Inc. | | Oil & Gas Operator | Oct 2001 |
| 175 | The Ballard & Cordell Corp | | Oil & Gas Operator | Feb 1982 |
| 176 | The Meridian Res. & Exp. LLC | | Oil & Gas Operator | Sep 2010 |
| 177 | The Meridian Resource & Exp Co | | Oil & Gas Operator | Dec 2000 |
| 178 | Time Energy, L.L.C. | | Oil & Gas Operator | Nov 2020 |
| 179 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 180 | Triumph Energy Inc | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2015 |
| 181 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 182 | TXP Operating Co. | | Oil & Gas Operator | Jul 1992 |
| 183 | Union Expl. Partners, LTD. | | Oil & Gas Operator | Aug 1990 |
| 184 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 185 | Union Texas Petroleum Corp | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
| 186 | United Gas Pipe Line Co. | | Oil Operator | Aug 1993 |
| 187 | Unocal Exploration Corporation | Houston, TX 77001 | Oil & Gas Operator | May 1992 |
| 188 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Feb 2026 |
| 189 | Valerius, Inc. & Zine, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jul 1994 |
| 190 | Verna Petroleum Company | | Oil & Gas Operator | Jun 1992 |
| 191 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 192 | W. L. Estis | | Oil & Gas Operator | Dec 1999 |
| 193 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 194 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Feb 2026 |
| 195 | WRT Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | May 1998 |
| 196 | Zeit Exploration Co., Inc. | | Oil & Gas Operator | May 1994 |
| 197 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |