| 101 | CXL Energy LLC | Canada, 00100 | Oil & Gas Operator | Apr 2026 |
| 102 | D & L Operating Co. | Bangs, TX 76823 | Oil & Gas Operator | Nov 2022 |
| 103 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | Apr 2026 |
| 104 | Daleco Resources, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Mar 2008 |
| 105 | Davco Oil LLC | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2026 |
| 106 | DBC Operating Company LLC | Midlothian, TX 76065 | Oil & Gas Operator | Apr 2026 |
| 107 | Del Mar Energy, Inc. | Van Alstyne, TX 75495 | Oil & Gas Operator | Apr 2026 |
| 108 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2026 |
| 109 | Denhart & Denhart | Brownwood, TX 76804 | Oil & Gas Operator | Dec 2001 |
| 110 | Denteco Oil Company LLC | Abilene, TX 79604 | Oil & Gas Operator | Apr 2026 |
| 111 | Diamond Mineral Investments Inc. | Bangs, TX 76823 | Gas Operator | Feb 2008 |
| 112 | DJM Beasley Well Service | Tuscola, TX 79562 | Oil Operator | Apr 2026 |
| 113 | DMV Pipeline LLC | Lipan, TX 76462 | Oil & Gas Operator | Apr 2026 |
| 114 | Doc Oil | Brownwood, TX 76801 | Oil & Gas Operator | Oct 2019 |
| 115 | Domino Operations, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Apr 2026 |
| 116 | Dominy Oil Co., Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Oct 1999 |
| 117 | Dorondoco Operating Co., Inc. | Brownwood, TX 76801 | Oil & Gas Operator | May 1994 |
| 118 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Apr 2026 |
| 119 | Double M Petroproperties, Inc. | Haskell, TX 79521 | Oil & Gas Operator | Apr 2026 |
| 120 | Double Play Oil & Gas, Inc | Portland, TX 78374 | Oil & Gas Operator | Apr 2026 |
| 121 | Down-Hole Pump Service Co., Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2026 |
| 122 | Duncan Drilling Co. | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2026 |
| 123 | Durango Operating Co., Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2002 |
| 124 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 125 | Dynamic Production, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2026 |
| 126 | Earthbound Resources LLC | Merkel, TX 79536 | Oil & Gas Operator | Apr 2026 |
| 127 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Apr 2026 |
| 128 | Eastland Exploration, Inc. | Austin, TX 78763 | Oil & Gas Operator | Apr 1997 |
| 129 | Eddie'S Royalties, Inc. | Rising Star, TX 76471 | Oil & Gas Operator | Apr 2026 |
| 130 | Eliteenergyholdings LLC | Beeville, TX 78102 | Oil & Gas Operator | Apr 2026 |
| 131 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2026 |
| 132 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2026 |
| 133 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 134 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 135 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 136 | Esoterra, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Apr 2026 |
| 137 | Eubank, Robert B. & B. K. | Spring, TX 77388 | Oil & Gas Operator | Mar 2008 |
| 138 | European-Southwest Co. | Houston, TX 77254 | Oil & Gas Operator | Apr 2026 |
| 139 | Excel Energy, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2026 |
| 140 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jan 2026 |
| 141 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 142 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2026 |
| 143 | Fargo Exploration Co. | Abilene, TX 79601 | Oil & Gas Operator | Dec 1995 |
| 144 | Figgie Natural Resources | Wickliffe, OH 44092 | Oil & Gas Operator | Oct 1995 |
| 145 | Firerock Company | Abilene, TX 79602 | Oil & Gas Operator | Apr 2026 |
| 146 | Formation Recovery LLC | Weatherford, TX 76087 | Oil & Gas Operator | Apr 2026 |
| 147 | Four Sevens Operating Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2026 |
| 148 | Fresno Oil Company | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2026 |
| 149 | Friendly Energy Services, Inc. | Corpus Christ, TX 78410 | Oil & Gas Operator | Apr 2026 |
| 150 | Furry Oil & Gas, Inc. | Bangs, TX 76823 | Oil & Gas Operator | Apr 2026 |
| 151 | Furry Operating Account | Brownwood, TX 76804 | Oil & Gas Operator | Aug 2003 |
| 152 | Furry Producing Company | Brownwood, TX 76801 | Oil & Gas Operator | Apr 2026 |
| 153 | Furry, Myrl M. | Brownwood, TX 76801 | Oil & Gas Operator | Dec 2003 |
| 154 | G & S Energy, Inc. | Bangs, TX 76823 | Oil & Gas Operator | Apr 2024 |
| 155 | G. S. Properties, Inc. | Arlington, TX 76013 | Oil & Gas Operator | May 1999 |
| 156 | G.& S. Landscaping, Inc. | Houston, TX 77095 | Gas Operator | Jun 2023 |
| 157 | Gas Corporation Of America | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2026 |
| 158 | Gassiot Holding Corporation | Coleman, TX 76834 | Oil & Gas Operator | Apr 2016 |
| 159 | Gaylyn, Inc. | Comanche, TX 76442 | Oil & Gas Operator | Apr 2026 |
| 160 | Gecko Oil & Gas | Brookesmith, TX 76827 | Oil & Gas Operator | Jun 2007 |
| 161 | Gerry-Mac Oil, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 162 | Ginco Operating Co. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2026 |
| 163 | Gopher Enterprises | Brownwood, TX 76801 | Oil & Gas Operator | Mar 2008 |
| 164 | Grand Banks Energy Company | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 165 | Gregory, J. Russell Inc. | Houston, TX 77025 | Gas Operator | Nov 2009 |
| 166 | Gro-Tex Exploration | Abilene, TX 79603 | Oil Operator | Apr 2026 |
| 167 | Grothe Bros. | Albany, TX 76430 | Oil & Gas Operator | May 2011 |
| 168 | GRS Oil & Gas Company | Irving, TX 75017 | Oil & Gas Operator | Aug 1994 |
| 169 | H-M Resource Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2023 |
| 170 | H. C. Oil Co. | Weatherford, TX 76085 | Oil & Gas Operator | Apr 2026 |
| 171 | Hailey Energy Corporation | Wesson, MS 39191 | Gas Operator | May 2013 |
| 172 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Apr 2026 |
| 173 | Hampton Oil & Gas | Early, TX 76802 | Gas Operator | Feb 2012 |
| 174 | Hane Operating, Inc. | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2005 |
| 175 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 176 | Harvest Operating Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 1997 |
| 177 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Apr 2026 |
| 178 | Havens Oil Company | Early, TX 76803 | Oil & Gas Operator | Dec 2025 |
| 179 | Hay Creek Investments, L.L.C. | Santa Anna, TX 76878 | Oil Operator | Jul 2018 |
| 180 | Haynes Production Company, Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Dec 2006 |
| 181 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 182 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 183 | Herring, Casey Oil Co. | Santa Anna, TX 76878 | Oil & Gas Operator | Nov 2008 |
| 184 | Hewitt, Alan P. | Midland, TX 79702 | Oil & Gas Operator | Aug 1997 |
| 185 | HGN Operating Company, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 186 | Hipp Oil And Gas Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Apr 2026 |
| 187 | Holland Oil & Gas | Brookesmith, TX 76827 | Oil & Gas Operator | Dec 2010 |
| 188 | Home-Stake Oil & Gas Company | Plano, TX 75093 | Oil & Gas Operator | Dec 2025 |
| 189 | Hood, J. F. | Holliday, TX 76366 | Oil & Gas Operator | Apr 2010 |
| 190 | Horan, Ken L. | Cross Plains, TX 76443 | Gas Operator | May 2002 |
| 191 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 192 | HRH Energy Group Incorporated | Carrollton, TX 75006 | Oil & Gas Operator | Nov 2009 |
| 193 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 194 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 195 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Apr 2026 |
| 196 | Hughes, Bob Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | Jul 2011 |
| 197 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 198 | Hunter Oil & Gas Co. | Bangs, TX 76823 | Oil & Gas Operator | Apr 2026 |
| 199 | Huntland Properties, LTD. | Santa Anna, TX 76878 | Oil & Gas Operator | Apr 2026 |
| 200 | Huntwood Resources, LLC | Huntsville, TX 77340 | Oil Operator | Apr 2026 |