| 101 | Discovery Geoservices Corp. | Dallas, TX 75206 | Gas Operator | Dec 1996 |
| 102 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Feb 2026 |
| 103 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 104 | Donnell Pipe & Supply Co/TX Corp | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2008 |
| 105 | Double Eight Oil Company LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Feb 2026 |
| 106 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 107 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 108 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Feb 2026 |
| 109 | Eastex Operating, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2003 |
| 110 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 111 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Dec 2025 |
| 112 | Ellis Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | Feb 2026 |
| 113 | Elm Grove Production, LLC | Dallas, TX 75360 | Oil & Gas Operator | Feb 2026 |
| 114 | Elms Oil Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 115 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 116 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 117 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Nov 2025 |
| 118 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 119 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 120 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 121 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 122 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 123 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 124 | Exco Partners Operating PTSHP LP | Dallas, TX 75251 | Oil & Gas Operator | Jan 2009 |
| 125 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Nov 2025 |
| 126 | Exotic Oil & Gas LLC | Indiana, PA 15701-3634 | Oil & Gas Operator | Dec 2025 |
| 127 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 128 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Feb 2026 |
| 129 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Feb 2026 |
| 130 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 131 | Fair Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 2000 |
| 132 | Fair Oil, LC | Tyler, TX 75710 | Oil & Gas Operator | Oct 2001 |
| 133 | Fair Oil, LTD. | Tyler, TX 75710 | Oil & Gas Operator | Feb 2026 |
| 134 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 135 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 136 | Fender Expl & Prod Co., L.L.C. | Tyler, TX 75710 | Oil & Gas Operator | Sep 2004 |
| 137 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 138 | Flint Pipeline Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 139 | Floex Energy LLC | Tyler, TX 75701 | Oil Operator | Feb 2026 |
| 140 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 141 | Fortune Operating Company | Willis, TX 77378 | Oil & Gas Operator | Feb 2026 |
| 142 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Feb 2026 |
| 143 | Ful-Hill Oil & Gas, Inc. | Marshall, TX 75670 | Oil & Gas Operator | Aug 2003 |
| 144 | Ful-Hill Oil & Gas, L.L.P. | Overton, TX 75684 | Oil & Gas Operator | Jun 2016 |
| 145 | Fullspike Energy LLC | Boyd, TX 76023 | Oil & Gas Operator | Feb 2026 |
| 146 | Genecov Group, Inc. The | Tyler, TX 75713 | Oil & Gas Operator | Dec 2002 |
| 147 | Genesis Producing Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2007 |
| 148 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 149 | George Interests | Tyler, TX 75703 | Oil & Gas Operator | Jul 1995 |
| 150 | Geosouthern Operating II, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2026 |
| 151 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 152 | Goldsberry Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 153 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | Feb 2026 |
| 154 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 155 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 156 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 157 | Graward Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2026 |
| 158 | Griffin Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Mar 2017 |
| 159 | Griffith Resources | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2013 |
| 160 | Grit Operating, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2023 |
| 161 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 162 | GTG Operating, LLC | Tyler, TX 75713 | Oil & Gas Operator | Feb 2026 |
| 163 | Gulfport Oil & Gas Inc. | Gulfport, MS 39501 | Oil & Gas Operator | Feb 2026 |
| 164 | Gunn Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 165 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 166 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 167 | Hansen Oil Corporation | Shreveport, LA 71106 | Oil Operator | Apr 2003 |
| 168 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Feb 2026 |
| 169 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 170 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 171 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Feb 2026 |
| 172 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 173 | Hootkins, Seymour G. | Archer City, TX 76351 | Oil & Gas Operator | Apr 1997 |
| 174 | Houston Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 175 | Howell Oil & Gas, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2019 |
| 176 | Hughey, W. R., Operating Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2005 |
| 177 | Hugus Investment Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 178 | Humak Processors, Inc. | Tyler, TX 75710 | Oil & Gas Operator | Aug 2005 |
| 179 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 180 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 181 | Hunt, WM. Herbert, Trust Est. | Dallas, TX 75201 | Oil & Gas Operator | Sep 1998 |
| 182 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Feb 2026 |
| 183 | J-Car Operating, Inc. | Lindale, TX 75771 | Oil & Gas Operator | Mar 1997 |
| 184 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Feb 2026 |
| 185 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Feb 2026 |
| 186 | Jackson, Jeral W. Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2004 |
| 187 | Jag Operating, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2019 |
| 188 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Feb 2026 |
| 189 | Jandar Exploration, L. C. | Tyler, TX 75703 | Oil & Gas Operator | Feb 2026 |
| 190 | Jena Operating Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2007 |
| 191 | Jil Oil Corp. | San Antonio, TX 78279 | Oil & Gas Operator | Feb 2026 |
| 192 | Jurassic Exploration, Inc. | Longview, TX 75601 | Oil & Gas Operator | Feb 2026 |
| 193 | Kalda Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1994 |
| 194 | Kalos Corporation | Tyler, TX 75701 | Oil & Gas Operator | Feb 2026 |
| 195 | Karper Company, The | Graham, TX 76450 | Oil & Gas Operator | Feb 2003 |
| 196 | Karper Oil & Gas Corporation | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 197 | Katy Resources LLC | Arlington, TX 76016 | Oil & Gas Operator | Feb 2026 |
| 198 | Keene, Roy J. Jr. | Sugar Land, TX 77498 | Oil & Gas Operator | Jun 2016 |
| 199 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 200 | Kepa Energy, L.C. | Marshall, TX 75670 | Oil & Gas Operator | Mar 1998 |