| 101 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 102 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 103 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 104 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 105 | Crosstex Services, L.L.C. | Tuscola, TX 79562 | Oil Operator | Oct 2025 |
| 106 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 107 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |
| 108 | Cwoc | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 109 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 110 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 111 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 112 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 113 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 114 | Dogwood Operating Company, Inc. | Houston, TX 77069 | Oil & Gas Operator | Oct 2025 |
| 115 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 116 | Duncan Drilling Co. | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 117 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 118 | Durango Resources Corp. | Houston, TX 77043 | Oil & Gas Operator | Oct 2025 |
| 119 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |
| 120 | Eagle Capital Partners, LLC | Eunice, NM 88231 | Oil & Gas Operator | Oct 2025 |
| 121 | Eagle Production, Inc. | Abilene, TX 79605 | Oil & Gas Operator | Oct 2025 |
| 122 | Earnest Producing Corporation | Midland, TX 79704 | Oil & Gas Operator | Oct 2025 |
| 123 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jul 2025 |
| 124 | Eastern Petroleum Company | Girard, OH 44420 | Oil & Gas Operator | Sep 1995 |
| 125 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 126 | Eclipse Services, Inc. * | La Grange, TX 78945 | Oil & Gas Operator | Jul 2003 |
| 127 | Edinburgh Energy Partners, LLC | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 128 | Edmar Company, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 129 | Elco Oil & Gas | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2014 |
| 130 | Elco Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2025 |
| 131 | Ellison Lease Operating | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2025 |
| 132 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 133 | Energy From Texas, L. P. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2013 |
| 134 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 135 | Enerquest Resources, LLC | Midland, TX 79702 | Oil & Gas Operator | Nov 2005 |
| 136 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 137 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 138 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Oct 2025 |
| 139 | Escondido Bay Corporation | Dallas, TX 75202 | Oil Operator | Oct 2025 |
| 140 | Esperanza Energy Corp. | Prosper, TX 75078 | Oil & Gas Operator | Mar 2015 |
| 141 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jun 2025 |
| 142 | Exco/Hgi JV Assets, LLC | Dallas, TX 75251 | Oil & Gas Operator | Jun 2014 |
| 143 | Exmoor Oil & Minerals Corp. | Dallas, TX 75225 | Oil & Gas Operator | May 1994 |
| 144 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 145 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 146 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 147 | Fisher, Jack Inc. | Abilene, TX 79603 | Oil & Gas Operator | Sep 2001 |
| 148 | Flat Creek Operating Co. | Rockwall, TX 75087 | Oil & Gas Operator | Jun 2004 |
| 149 | Flint Oil & Gas | San Angelo, TX 76904 | Oil & Gas Operator | Aug 2003 |
| 150 | Floyd Oil Co | Houston, TX 77002 | Oil & Gas Operator | Nov 1999 |
| 151 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 152 | Fortune Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2025 |
| 153 | Fortune Production Co. | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2008 |
| 154 | Fossil Petroleum LLC | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2025 |
| 155 | Four C Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2024 |
| 156 | Free Rein Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Oct 2025 |
| 157 | Fullerton, B. N. | San Angelo, TX 76904 | Oil & Gas Operator | Jul 1994 |
| 158 | Gco Drilling Company | Midland, TX 79702 | Oil & Gas Operator | Dec 1993 |
| 159 | GGP Exploration, LTD. | Fort Worth, TX 76101 | Oil & Gas Operator | Oct 2025 |
| 160 | Giebel Petroleum LTD. | Midland, TX 79705 | Oil & Gas Operator | Jul 2019 |
| 161 | Gilstrap, Joel | Water Valley, TX 76958 | Oil & Gas Operator | Oct 2025 |
| 162 | Go Oil Corp. | Jacksboro, TX 76458 | Oil & Gas Operator | Oct 2025 |
| 163 | Golden Oil And Ranch, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 164 | Golden Specialties Oil & Gas | Midland, TX 79708 | Oil & Gas Operator | Oct 2025 |
| 165 | Grace 7 Properties, LTD. | Argyle, TX 76226 | Oil & Gas Operator | Oct 2025 |
| 166 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 167 | Grandfield Consulting, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2011 |
| 168 | Great Northern Energy, Inc | Irving, TX 75039 | Oil & Gas Operator | Oct 2025 |
| 169 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 170 | Green, Roy W. Oil & Gas | San Angelo, TX 76902 | Oil & Gas Operator | Jun 2021 |
| 171 | Griffin Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 172 | Grizzly Op Of Delaware, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2021 |
| 173 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 174 | Guffey, Roy, Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2011 |
| 175 | Gulf States Production Company | Houston, TX 77027 | Oil & Gas Operator | Aug 1997 |
| 176 | H & O Operating Co | Odessa, TX 79764 | Oil & Gas Operator | Mar 2008 |
| 177 | H&P Oil & Gas LLC | Mertzon, TX 76941 | Oil & Gas Operator | Oct 2025 |
| 178 | H-M Resource Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2023 |
| 179 | Hallwood Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2005 |
| 180 | Hannathon Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 181 | Hanson Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 182 | Harding Well Service Co. | Coahoma, TX 79511 | Oil & Gas Operator | Aug 2003 |
| 183 | Harvard Petroleum Corporation | Roswell, NM 88201 | Oil & Gas Operator | Dec 2004 |
| 184 | Henderson Natural Res, L.L.C. | Crozet, VA 22932 | Oil & Gas Operator | Oct 2025 |
| 185 | Henderson, Peter Oil Co. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2020 |
| 186 | Hendrix, John H. Corporation | Midland, TX 79705 | Oil & Gas Operator | Sep 2018 |
| 187 | Henry Petroleum LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2008 |
| 188 | Henson Exploration, L.P. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 189 | Herbig, J F | Midland, TX 79701 | Oil & Gas Operator | Mar 1998 |
| 190 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Oct 2025 |
| 191 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Oct 2025 |
| 192 | Hibernia Resources IV, LLC | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 193 | Hickox Oil Texas Company, Inc. | Mobile, AL 36689 | Oil & Gas Operator | Feb 1996 |
| 194 | Highland Production Company | Midland, TX 79701 | Oil & Gas Operator | Mar 1996 |
| 195 | Hillcrest Petroleum, LLC | Midland, TX 79707 | Oil & Gas Operator | Jun 2019 |
| 196 | Holler Oil Co. | San Angelo, TX 76906 | Oil & Gas Operator | Aug 2003 |
| 197 | Holloway Oil Company | Austin, TX 78764 | Oil & Gas Operator | Feb 2004 |
| 198 | Holt Oil And Cattle LLC | Bedias, TX 77831 | Oil & Gas Operator | Oct 2025 |
| 199 | Horizon Well Services, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 200 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |