| 101 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 102 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 103 | Edington Oil Company | Albany, TX 76430 | Oil & Gas Operator | Aug 2006 |
| 104 | Edisto Resources Corp | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 105 | Edmar Company, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 106 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 107 | Edmonds, Karl F. Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2005 |
| 108 | Edmondson Oil & Gas | Ballinger, TX 76821 | Oil & Gas Operator | Apr 2025 |
| 109 | Edp Management Company | Houston, TX 77056 | Oil & Gas Operator | Jul 2018 |
| 110 | Edward Oil Company | Youngsville, PA 16371 | Oil & Gas Operator | Nov 2024 |
| 111 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 112 | Edwards Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 113 | Edwards Petroleum Company | Houston, TX 77092 | Oil & Gas Operator | Aug 2003 |
| 114 | Edwards, Gus Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2004 |
| 115 | Edwards, James | Albany, TX 76430 | Oil & Gas Operator | Sep 2000 |
| 116 | Edwards-Foster, Inc. | Midland, TX 79708 | Oil & Gas Operator | Aug 1996 |
| 117 | Eei Operating Inc. | Plano, TX 75093 | Oil & Gas Operator | May 2015 |
| 118 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 119 | Eex E&P Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 120 | Eex Operating, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 121 | Ef Energy, L.L.C. | Houston, TX 77084 | Oil & Gas Operator | Jun 2015 |
| 122 | Ef Oil And Gas Invest, L.L.C. | Beaver, OK 73932 | Oil Operator | Apr 2025 |
| 123 | Efficiency Operating Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2008 |
| 124 | Efficiency Operating Service | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2025 |
| 125 | Egan Resources Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2016 |
| 126 | Eggleston, Garaland | Big Lake, TX 76932 | Oil & Gas Operator | Aug 2003 |
| 127 | Egi, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Apr 2025 |
| 128 | Egl Oil And Gas Corporation | Tyler, TX 75703 | Oil & Gas Operator | Aug 2003 |
| 129 | Ehrlich, Mitchell | Perryton, TX 79070 | Oil & Gas Operator | May 1999 |
| 130 | Ehvi Exploration LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 131 | Eighty-Six Oil Company, Inc. | Luling, TX 78648 | Oil & Gas Operator | Apr 2025 |
| 132 | Eise Oil, Inc. | San Antonio, TX 78213 | Oil Operator | Apr 2025 |
| 133 | El Campo Operating, LLC | Dallas, TX 75206 | Oil & Gas Operator | Feb 2011 |
| 134 | El Dorado Gas & Oil, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Apr 2025 |
| 135 | El Dorado Resources Inc. | Waco, TX 76710 | Oil & Gas Operator | Oct 2009 |
| 136 | El Indio Energy LLC | Austin, TX 78746 | Oil Operator | Apr 2025 |
| 137 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 138 | El Paso E&P Zapata, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2010 |
| 139 | El Paso Field Services Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 140 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 141 | El Paso Production Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | Apr 2025 |
| 142 | El Ran, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Apr 2025 |
| 143 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Apr 2025 |
| 144 | El Toro Resources LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2025 |
| 145 | El Tres Exploration | Houston, TX 77098 | Oil & Gas Operator | Mar 2008 |
| 146 | Elam, Jack G. | Midland, TX 79702 | Oil & Gas Operator | Dec 2002 |
| 147 | Elam, Jack G., Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 148 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Feb 2025 |
| 149 | Elco Oil & Gas | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2014 |
| 150 | Elco Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Apr 2025 |
| 151 | Eldon Oil Co. | Three Rivers, TX 78071 | Oil & Gas Operator | Apr 2025 |
| 152 | Eldorado Oil And Gas, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Nov 1995 |
| 153 | Eldorado Operating Co. | Dallas, TX 75230 | Oil & Gas Operator | Jul 2004 |
| 154 | Eldred Prod And Consulting, LLC | Nocona, TX 76255 | Oil Operator | Apr 2025 |
| 155 | Electragas, Inc. | Houston, TX 77064 | Oil Operator | Apr 2025 |
| 156 | Element Petro Operating II, LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2016 |
| 157 | Element Petroleum Op III, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 158 | Element Petroleum Operating IV, | Midland, TX 79710 | Oil Operator | Apr 2025 |
| 159 | Element Petroleum Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2015 |
| 160 | Elendil Resources LLC | Pampa, TX 79066 | Oil & Gas Operator | Apr 2025 |
| 161 | Eleon Operators, LLC | Katy, TX 77494 | Oil & Gas Operator | Apr 2025 |
| 162 | Elephant Oil & Gas, LLC | Dallas, TX 75204 | Oil & Gas Operator | Nov 2015 |
| 163 | Elevation Resources LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 164 | Elfco, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Jun 1996 |
| 165 | Elison Oil & Gas, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Oct 1999 |
| 166 | Elk Energy Corporation | Denver, CO 80218 | Oil & Gas Operator | Mar 2008 |
| 167 | Elk Energy Holdings LLC | Wichita, KS 67226 | Oil & Gas Operator | Dec 2024 |
| 168 | Elk Meadows Resources LLC | Houston, TX 77037 | Oil & Gas Operator | Jan 2021 |
| 169 | Elk River Resources, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Oct 2023 |
| 170 | Elkhorn Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 1995 |
| 171 | Ellard Oil | Loving, TX 76460 | Oil & Gas Operator | May 2022 |
| 172 | Ellard, Herman | Graham, TX 76450 | Oil & Gas Operator | Feb 2005 |
| 173 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 174 | Elliott Oil & Gas Operating Co. | Magnolia, TX 77354 | Oil & Gas Operator | Apr 2025 |
| 175 | Elliott Oil Company, L.P. | Magnolia, TX 77354 | Oil & Gas Operator | Apr 2025 |
| 176 | Ellis Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | Apr 2025 |
| 177 | Ellis, Amon | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 178 | Ellison Lease Operating | Bridgeport, TX 76426 | Oil & Gas Operator | Apr 2025 |
| 179 | Ellison, Dewitt, Jr. | Aspermont, TX 79502 | Oil & Gas Operator | Mar 2016 |
| 180 | Ellora Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 181 | Ellora LLC | Boulder, CO 80308 | Oil & Gas Operator | Feb 2010 |
| 182 | Ellora Operating, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2011 |
| 183 | Ellstrom Energy Company | Kingwood, TX 77339 | Oil & Gas Operator | Nov 2000 |
| 184 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 2025 |
| 185 | Elm Grove Production, LLC | Dallas, TX 75360 | Oil & Gas Operator | Apr 2025 |
| 186 | Elms Oil Company | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 187 | Elp Production Company LLC | Dallas, TX 75287 | Oil Operator | Apr 2025 |
| 188 | Elson Oil Company | Tulsa, OK 74103-4429 | Oil & Gas Operator | Dec 2016 |
| 189 | Eltex Energy Group, Inc. | Houston, TX 77055 | Gas Operator | Aug 2003 |
| 190 | Em-Gee Oil Account | Jacksonville, TX 75766 | Oil & Gas Operator | Sep 1995 |
| 191 | Embassy Energy, L.L.C. | Oklahoma City, OK 73112 | Gas Operator | Apr 2001 |
| 192 | Embassy Oil Company | Highland VLG, TX 75077 | Oil & Gas Operator | Apr 2025 |
| 193 | Embassy Well Service, LLC | Carrollton, TX 75011 | Oil & Gas Operator | Apr 2025 |
| 194 | Embrey Oil Production Co. | Sutherlnd SPG, TX 78161 | Oil & Gas Operator | Oct 2021 |
| 195 | Emco Oil & Gas | Graham, TX 76450 | Oil & Gas Operator | Dec 1995 |
| 196 | Emco Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2002 |
| 197 | Emerald Bay Energy, Inc. | San Antonio, TX 78230 | Oil Operator | Apr 2025 |
| 198 | Emerald Gather And Trans, LLC | Cypress, TX 77429 | Oil & Gas Operator | Apr 2025 |
| 199 | Emerald Oil & Gas LC | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2025 |
| 200 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | Feb 2025 |