| 101 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 102 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 103 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 104 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 105 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Feb 2026 |
| 106 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 107 | Greystone Operating, Inc. | | Oil & Gas Operator | Nov 2009 |
| 108 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 109 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 110 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 111 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 112 | Hemco Development, LLC | Dallas, TX 75201 | Oil & Gas Operator | Nov 2020 |
| 113 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 114 | HGH Energy, Inc. | | Oil & Gas Operator | Jun 2001 |
| 115 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Feb 2026 |
| 116 | Hou-Tex Oil And Gas | | Oil & Gas Operator | Jul 1982 |
| 117 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 118 | Hy-Mark Oil & Gas, Inc. | | Oil Operator | Mar 1991 |
| 119 | Iberia Operating Corporation | | Oil & Gas Operator | Jan 2003 |
| 120 | Imc Exploration Co. | | Oil & Gas Operator | Oct 1986 |
| 121 | Indian Exploration, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2026 |
| 122 | J & R Systems, Inc. | | Oil Operator | Apr 2002 |
| 123 | J P Van Way | | Oil & Gas Operator | Dec 2024 |
| 124 | J V A Operating Company, Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2021 |
| 125 | J. P. Owen & Co. Inc. | | Oil & Gas Operator | Feb 1991 |
| 126 | James A. Whitson, Jr. | | Oil & Gas Operator | Apr 2016 |
| 127 | James M. Forgotson | | Oil & Gas Operator | Jan 1984 |
| 128 | Joe W. Elsbury | | Oil & Gas Operator | Oct 1988 |
| 129 | Jolen Operating Co Of La. | | Oil & Gas Operator | Dec 1993 |
| 130 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2025 |
| 131 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Feb 2026 |
| 132 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | Feb 2026 |
| 133 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 134 | Key Operating Company Inc | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 135 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | Feb 2026 |
| 136 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 137 | L E Carpenter Oil & Gas, Inc. | | Oil & Gas Operator | Sep 1985 |
| 138 | La Intrastate Gas Co LLC | | Oil Operator | Apr 2004 |
| 139 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 140 | Lavino Oil And Gas Company | | Oil & Gas Operator | Aug 1989 |
| 141 | Lea Exploration, Inc. | | Oil & Gas Operator | Nov 1989 |
| 142 | Leggett Petroleum, L.L.C. | | Oil & Gas Operator | Dec 2020 |
| 143 | Liberty Resources, Inc. | | Oil & Gas Operator | Dec 2024 |
| 144 | Louisiana Gas Development Corp | | Oil & Gas Operator | Jan 2025 |
| 145 | Louisiana Intrastate Gas Corp. | | Oil Operator | Feb 1994 |
| 146 | Lynal, Inc. | | Oil & Gas Operator | Oct 1988 |
| 147 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |
| 148 | M. F. McCain, Inc. | | Oil & Gas Operator | Jul 1987 |
| 149 | Machin & Associates, Inc. | Longview, TX 75606 | Oil & Gas Operator | Feb 2026 |
| 150 | Main Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 2009 |
| 151 | Map Drilling Company | | Oil & Gas Operator | Apr 2012 |
| 152 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 153 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 154 | Matzinger Expl Co& Texas Crude | | Oil & Gas Operator | Jun 1980 |
| 155 | May Petroleum Inc | Dallas, TX 75231 | Oil & Gas Operator | Nov 1998 |
| 156 | McCord Exploration Co. | | Oil & Gas Operator | Dec 1990 |
| 157 | McCulloch Oil Corp.-Ids | | Oil & Gas Operator | Dec 1981 |
| 158 | McMoran Exploration Company | | Oil & Gas Operator | May 1985 |
| 159 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 160 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 161 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 162 | Meyers-Lasher, Inc. | | Oil & Gas Operator | Mar 1999 |
| 163 | Moore McCormack Energy, Inc. | | Oil & Gas Operator | Jul 1988 |
| 164 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 165 | Nerco Oil & Gas Inc | | Oil & Gas Operator | Dec 1996 |
| 166 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |
| 167 | Nicklos Oil & Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1986 |
| 168 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 169 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 170 | Ody Oil Corp. | | Oil & Gas Operator | Oct 1994 |
| 171 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Feb 2026 |
| 172 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 173 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 174 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 175 | Palace Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2007 |
| 176 | Pan-Ok Production Company | | Oil & Gas Operator | Nov 2024 |
| 177 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 178 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 179 | Paul E. Cameron, Jr., Inc. | | Oil & Gas Operator | May 2003 |
| 180 | Pel-Tex Oil Company, Inc. | | Oil & Gas Operator | Jul 1995 |
| 181 | Petro "E", LLC | | Oil & Gas Operator | Feb 2010 |
| 182 | Petro Ventures Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2019 |
| 183 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 184 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | May 2025 |
| 185 | Petroleum Exchange | | Oil & Gas Operator | Oct 1997 |
| 186 | Petroleum Resources MGMT Corp. | | Oil & Gas Operator | Mar 2002 |
| 187 | Petroquest Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2001 |
| 188 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2026 |
| 189 | Petrus Oil Company, L.P. | | Oil & Gas Operator | Dec 1989 |
| 190 | Petrus Operating Co., Inc. | | Oil & Gas Operator | Dec 1986 |
| 191 | Phalanx Petroleum LLC | | Oil & Gas Operator | Jan 2025 |
| 192 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 193 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 194 | Phoenix Oil & Gas LTD., L.L.P. | Houston, TX 77010 | Oil & Gas Operator | Jun 2004 |
| 195 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | Dec 2025 |
| 196 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Dec 2025 |
| 197 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 198 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Sep 2025 |
| 199 | Pioneer Prod. Corp. | | Oil & Gas Operator | Jun 1986 |
| 200 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |