| 101 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 102 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 103 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 104 | Contrast Energy, LLC | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2025 |
| 105 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 106 | Corsa Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 107 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Apr 2025 |
| 108 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 109 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 110 | Covey Park Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Aug 2019 |
| 111 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 112 | CR2 Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 113 | Craton Operating LLC | Bellaire, TX 77401 | Oil & Gas Operator | Apr 2025 |
| 114 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Apr 2025 |
| 115 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 116 | Crestridge DRLG. & Prod.Co.,LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2023 |
| 117 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 118 | Culver & Cain Production LLC | Tyler, TX 75711 | Oil & Gas Operator | Apr 2025 |
| 119 | D-S-B Properties, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2014 |
| 120 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Apr 2025 |
| 121 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 122 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 123 | Decker Operating Co., L.L.C. | Houston, TX 77008 | Oil & Gas Operator | Apr 2025 |
| 124 | Deguello Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 125 | Delaware Davis Petroleum Corp. | Houston, TX 77056 | Oil & Gas Operator | Jan 2000 |
| 126 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 127 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 128 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2023 |
| 129 | Diamond Oil And Gas, Inc. | Kalamazoo, MI 49001 | Oil & Gas Operator | Apr 2025 |
| 130 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 131 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Apr 2025 |
| 132 | Douglas Petroleum Inc. | Spring, TX 77379 | Oil & Gas Operator | Nov 2010 |
| 133 | Dynamic Of Texas, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Aug 2003 |
| 134 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2025 |
| 135 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 136 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Apr 2025 |
| 137 | Edf Trading Resources, LLC | Austin, TX 78746 | Oil & Gas Operator | Jul 2015 |
| 138 | Edisto Resources Corp | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 139 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 140 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 141 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 142 | Ellis Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | Apr 2025 |
| 143 | Empire Texas Operating LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2025 |
| 144 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 145 | Energy & Expl. PRTNRS Oper., LP | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2016 |
| 146 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 147 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Jan 2025 |
| 148 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 149 | Enerquest Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 150 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 151 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 152 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 153 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 154 | Ensight Resources, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 155 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 156 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 157 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 158 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 159 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 160 | Etopsi Oil And Gas, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 161 | Etx Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2022 |
| 162 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 163 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 164 | Exzena Oil Corp. | Tyler, TX 75713 | Oil & Gas Operator | Apr 2025 |
| 165 | Fairway Operating, Inc. | Lake Jackson, TX 77566 | Oil & Gas Operator | Apr 2025 |
| 166 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 167 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Apr 2025 |
| 168 | First Source Gas, LP | Houston, TX 77010 | Gas Operator | Jan 2006 |
| 169 | First Source Texas, Inc. | MT Pleasant, MI 48858 | Gas Operator | Nov 2004 |
| 170 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Apr 2025 |
| 171 | Flamingo Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Apr 2025 |
| 172 | Fletcher Operating, LLC | Fairhope, AL 36532 | Oil & Gas Operator | Apr 2025 |
| 173 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 174 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 175 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 176 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Apr 2025 |
| 177 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2025 |
| 178 | Fossil Operating, Inc. | Dallas, TX 75238 | Oil & Gas Operator | Apr 2025 |
| 179 | Fullspike Energy LLC | Boyd, TX 76023 | Oil & Gas Operator | Apr 2025 |
| 180 | Furie Operating, LLC | League City, TX 77573 | Oil & Gas Operator | Nov 2015 |
| 181 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 182 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Apr 2025 |
| 183 | Gardner Energy Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 1999 |
| 184 | Garrison Operating, L.L.C. | Tomball, TX 77375 | Oil & Gas Operator | Apr 2025 |
| 185 | Gary Oil & Gas | Deer Park, TX 77536 | Oil & Gas Operator | Apr 2025 |
| 186 | Gastar Exploration Texas, LP | Houston, TX 77010 | Oil & Gas Operator | Oct 2018 |
| 187 | Gec Operating, Inc. | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 188 | Genepa Petroleum Company | Spring, TX 77379 | Oil & Gas Operator | Apr 2025 |
| 189 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 190 | Giant NRG Co., LP | Dallas, TX 75230 | Oil & Gas Operator | Apr 2025 |
| 191 | Global Natural Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | May 1998 |
| 192 | Goldsmith Operating, LLC | Tyler, TX 75711 | Oil & Gas Operator | Apr 2025 |
| 193 | Goldsmith, J. Paul | Tyler, TX 75711 | Oil & Gas Operator | Feb 1997 |
| 194 | Goldsmith, Neta R. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2009 |
| 195 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 196 | Grand Energy, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Oct 2002 |
| 197 | Graward Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Apr 2025 |
| 198 | Graystone Energy Corporation | Judson, TX 75660 | Oil & Gas Operator | Apr 2025 |
| 199 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 200 | Gsi Oil & Gas, Inc. | Bryan, TX 77806 | Oil & Gas Operator | Apr 2025 |