| 101 | Dallas Operating Corp. | Dallas, TX 75205 | Oil & Gas Operator | Nov 2006 |
| 102 | Daniel Explorations Inc | Georgetown, TX 78627 | Oil & Gas Operator | Apr 2009 |
| 103 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 104 | Delta Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 105 | DG&E/Slocum, Limited Partnership | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 106 | Double Diamond Petroleum, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 107 | Eagle Natural Resources, LLC | Eunice, NM 88231 | Oil Operator | Feb 2026 |
| 108 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 109 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Feb 2026 |
| 110 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 111 | Eex E&P Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 112 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Nov 2025 |
| 113 | Ellis Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | Feb 2026 |
| 114 | Embry Solutions, Inc. | Dallas, TX 75315 | Oil Operator | Feb 2026 |
| 115 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 116 | Encore Energy, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 117 | Encrescent, LLC | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 118 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 119 | Enercap Corporation | Kingwood, TX 77325 | Oil & Gas Operator | Aug 2003 |
| 120 | Energy 2000, Inc. | Reno, NV 89501 | Oil & Gas Operator | Feb 2026 |
| 121 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Oct 2025 |
| 122 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 123 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Oct 2025 |
| 124 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 125 | Enr Operating, LLC | Eunice, NM 88231 | Oil & Gas Operator | Feb 2026 |
| 126 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 127 | Etx Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2022 |
| 128 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Feb 2026 |
| 129 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 130 | Fair Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 2000 |
| 131 | Fair Oil, LTD. | Tyler, TX 75710 | Oil & Gas Operator | Feb 2026 |
| 132 | Falcon Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2021 |
| 133 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 134 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Nov 2025 |
| 135 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Feb 2026 |
| 136 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 137 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Feb 2026 |
| 138 | Four - S Oil Company, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2008 |
| 139 | Four-S Oil Co., LTD. | Kilgore, TX 75663 | Oil Operator | Apr 2007 |
| 140 | Fuller Petroleum Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 141 | Garrison Oil Company | Elkhart, TX 75839 | Oil & Gas Operator | Aug 1995 |
| 142 | Genecov Group, Inc. The | Tyler, TX 75713 | Oil & Gas Operator | Dec 2002 |
| 143 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 144 | Geosouthern Operating II, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2026 |
| 145 | Global Natural Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | May 1998 |
| 146 | Global XRC Corp | Pittsburg, TX 75686 | Oil & Gas Operator | Feb 2026 |
| 147 | GMT Exploration Co Texas, LLC | Houston, TX 77070 | Oil & Gas Operator | Jun 2014 |
| 148 | Go & Go | Dallas, TX 75218 | Oil & Gas Operator | Mar 2018 |
| 149 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 150 | Goldsmith, J. Paul | Tyler, TX 75711 | Oil & Gas Operator | Feb 1997 |
| 151 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | Feb 2026 |
| 152 | Graward Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2026 |
| 153 | Green River Resources Inc. | Keystone, CO 80435 | Oil & Gas Operator | Feb 2026 |
| 154 | Griffin Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Mar 2017 |
| 155 | Grizzly Op Of Delaware, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2021 |
| 156 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 157 | Hansen Oil Corporation | Shreveport, LA 71106 | Oil Operator | Apr 2003 |
| 158 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Feb 2026 |
| 159 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 160 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Feb 2026 |
| 161 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Feb 2026 |
| 162 | Highmark Energy Operating LLC | Dallas, TX 75222 | Oil & Gas Operator | Feb 2026 |
| 163 | Hill, Hub, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 1994 |
| 164 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 165 | Hombre Oil Co., LTD. | Tyler, TX 75713 | Oil & Gas Operator | Apr 2021 |
| 166 | Hopewell Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2026 |
| 167 | Howard, Anthony E. F. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2001 |
| 168 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Feb 2026 |
| 169 | Hughey, W. R., Operating Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2005 |
| 170 | Hugus Investment Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 171 | Humak Processors, Inc. | Tyler, TX 75710 | Oil & Gas Operator | Aug 2005 |
| 172 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 173 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 174 | Hunt, WM. Herbert, Trust Est. | Dallas, TX 75201 | Oil & Gas Operator | Sep 1998 |
| 175 | Hydrogeo, L.L.C. | Houston, TX 77074 | Oil & Gas Operator | Feb 2026 |
| 176 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 177 | Imagery Exploration, Inc. | Dallas, TX 75380 | Oil & Gas Operator | Feb 2026 |
| 178 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 179 | Inland Production Company | Vernal, UT 84079 | Oil & Gas Operator | Dec 2004 |
| 180 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 181 | Ironwood Oil & Gas LLC | Houston, TX 77067 | Oil & Gas Operator | Jun 2014 |
| 182 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Feb 2026 |
| 183 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Feb 2026 |
| 184 | Jenex Operating Company Of Texas | Denver, CO 80209 | Oil & Gas Operator | Aug 2003 |
| 185 | Jla Resources Company | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 186 | Josey Oil Company | Houston, TX 77019 | Oil & Gas Operator | Jul 2006 |
| 187 | K-B Exploration Co. | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 188 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Feb 2026 |
| 189 | Kalos Corporation | Tyler, TX 75701 | Oil & Gas Operator | Feb 2026 |
| 190 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 191 | Key Petroleum Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 2003 |
| 192 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Nov 2025 |
| 193 | Killingsworth, Lee Operator | Longview, TX 75601 | Oil & Gas Operator | Jan 1999 |
| 194 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Feb 2026 |
| 195 | Kriti Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2012 |
| 196 | La Roca Energy, LP | Dallas, TX 75207 | Oil & Gas Operator | May 2024 |
| 197 | Lacy, F. B. Inc. | Houston, TX 77055 | Oil & Gas Operator | Sep 1997 |
| 198 | Lacy, R., Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2002 |
| 199 | Lease Holders Acquisitions LLC | Yukon, OK 73099 | Gas Operator | Feb 2026 |
| 200 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Feb 2026 |