| 101 | Cumberland Petroleum, Inc. II | Weatherford, TX 76086 | Oil & Gas Operator | May 1997 |
| 102 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2025 |
| 103 | Cundiff Operating Company | Dallas, TX 75238 | Oil & Gas Operator | Apr 2025 |
| 104 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Apr 2025 |
| 105 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 106 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Apr 2025 |
| 107 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 108 | Dallas Royalty, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2012 |
| 109 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 110 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 111 | Denbury Resources Inc. | Plano, TX 75024 | Oil & Gas Operator | Dec 2003 |
| 112 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 113 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 114 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 115 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2023 |
| 116 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Apr 2025 |
| 117 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Apr 2025 |
| 118 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Apr 2025 |
| 119 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 120 | Doc'S Tank Trucks | Jacksboro, TX 76458 | Oil Operator | Jun 2007 |
| 121 | Dogwood Operating Company, Inc. | Houston, TX 77069 | Oil & Gas Operator | Apr 2025 |
| 122 | Dooley, Jeff | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2012 |
| 123 | Double Diamond Energy Corp. | Granbury, TX 76048 | Gas Operator | Apr 2013 |
| 124 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Apr 2025 |
| 125 | Dte Gas Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2007 |
| 126 | Dte Gas Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2014 |
| 127 | Dual Quiver Oil & Gas Op, LLC | Flower Mound, TX 75027 | Oil & Gas Operator | Apr 2025 |
| 128 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2025 |
| 129 | E.C. Hindman Oil And Gas | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 130 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 131 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 132 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2025 |
| 133 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 134 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Apr 2025 |
| 135 | Empire Exploration Corp. 1989 | Lebanon, MO 65536 | Oil & Gas Operator | Mar 2003 |
| 136 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 137 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 138 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Jan 2025 |
| 139 | Energy Well Service, Inc. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2004 |
| 140 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Apr 2025 |
| 141 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 142 | Engas Corporation | Jacksboro, TX 76458 | Oil & Gas Operator | May 2008 |
| 143 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 144 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 145 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 146 | Ernmar Investments, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Apr 2025 |
| 147 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 148 | Exorare Energy, Inc. | Dallas, TX 75218 | Oil & Gas Operator | Apr 2025 |
| 149 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 150 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Apr 2025 |
| 151 | Extech Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Apr 2025 |
| 152 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 153 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 154 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Apr 2025 |
| 155 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Feb 2025 |
| 156 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | Apr 2025 |
| 157 | Federal Energy Development Co. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2011 |
| 158 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | Apr 2025 |
| 159 | Fossil Fuels Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2000 |
| 160 | Fossil Operating, Inc. | Dallas, TX 75238 | Oil & Gas Operator | Apr 2025 |
| 161 | Four Sevens Oil Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 162 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 163 | FTM Incorporated | Weatherford, TX 76086 | Gas Operator | Apr 2025 |
| 164 | Fullspike Energy LLC | Boyd, TX 76023 | Oil & Gas Operator | Apr 2025 |
| 165 | Future Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 1999 |
| 166 | FX Energy Operating, LLC | Canadian, TX 79014 | Oil & Gas Operator | Apr 2025 |
| 167 | G & F Oil, Inc. | Aledo, TX 76008 | Oil & Gas Operator | Apr 2025 |
| 168 | Gas Tap Corp. | Plano, TX 75075 | Gas Operator | Apr 2025 |
| 169 | Geostrat Inc. | Addison, TX 75001 | Oil & Gas Operator | Nov 2011 |
| 170 | Giant Energy Corp. | Dallas, TX 75230 | Oil & Gas Operator | Jul 2019 |
| 171 | Giant NRG Co., LP | Dallas, TX 75230 | Oil & Gas Operator | Apr 2025 |
| 172 | Glen D. Gonzenbach, LLC | Henrietta, TX 76365 | Oil & Gas Operator | Dec 2016 |
| 173 | Global Drilling, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 174 | Go Oil Corp. | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2025 |
| 175 | Gonzenbach Oil & Gas, LLC | Henrietta, TX 76365 | Oil & Gas Operator | May 2020 |
| 176 | Gonzenbach, Glen D | Henrietta, TX 76365 | Oil & Gas Operator | Aug 2007 |
| 177 | Gould Energy Co. | Owasso, OK 74055 | Oil & Gas Operator | Mar 2005 |
| 178 | Grand Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Dec 2020 |
| 179 | Grayrock Energy II, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Apr 2025 |
| 180 | Graystone Exploration Corp. | Garland, TX 75043 | Oil & Gas Operator | Aug 2003 |
| 181 | Great West Operating Co., Inc. | Dallas, TX 75240 | Oil & Gas Operator | Aug 2003 |
| 182 | Green River Resources Inc. | Keystone, CO 80435 | Oil & Gas Operator | Apr 2025 |
| 183 | Grey Rider Energy, LLC | Schertz, TX 78154 | Oil & Gas Operator | Apr 2025 |
| 184 | Grissom, Charles A. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2001 |
| 185 | Grynberg, Jack J. | Denver, CO 80237 | Oil & Gas Operator | Jun 2021 |
| 186 | Gulftex Operating Inc | Plano, TX 75093 | Oil & Gas Operator | Apr 2025 |
| 187 | Gupton Gas Co. | Fort Worth, TX 76107 | Oil & Gas Operator | Aug 1994 |
| 188 | Gypsy Oil Co. | Austin, TX 78720 | Oil & Gas Operator | Jul 2017 |
| 189 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 190 | H & S Drilling Co Inc | Frazeysburg, OH 43822-0040-0040 | Oil & Gas Operator | Dec 2016 |
| 191 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 192 | Hall Exploration, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 193 | Hallwood Petroleum, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2010 |
| 194 | Hanks, Christopher Glenn | Gainesville, TX 76240 | Oil & Gas Operator | Apr 2025 |
| 195 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 196 | Hardrock Operating Company, Inc. | Fort Worth, TX 76161 | Oil & Gas Operator | Apr 2025 |
| 197 | Hargis Exploration & Prod., Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Jul 1996 |
| 198 | Harrell Operating Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2005 |
| 199 | Harwell Enterprises | Loveland, CO 80537 | Gas Operator | Nov 2019 |
| 200 | Heflin, Bryan Exploration, Inc. | Strawn, TX 76475 | Oil & Gas Operator | Mar 2008 |