| 101 | Emde & McNeil | Carney, OK 74832 | Oil & Gas Operator | Nov 1998 |
| 102 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | Feb 2026 |
| 103 | Emerson Oil Company | Rindge, NH 03461 | Oil & Gas Operator | Feb 2008 |
| 104 | Emery Billie E | Skiatook, OK 74070 | Oil Operator | Feb 2026 |
| 105 | Emery Edward A | Tulsa, OK 74145-7921 | Oil Operator | Feb 2026 |
| 106 | Emjo Operations Inc | Marlow, OK 73055-8803 | Oil & Gas Operator | Jan 2026 |
| 107 | Emo Inc | Eufaula, OK 74432-0841 | Oil & Gas Operator | Apr 2020 |
| 108 | Empire Land Corporation | New Orleans, LA 70130 | Oil & Gas Operator | Nov 2014 |
| 109 | Empire Operating LLC | Lawton, OK 73501 | Oil Operator | Jan 2026 |
| 110 | Empire Petroleum Company | Houston, TX 77044 | Oil Operator | Mar 2011 |
| 111 | Empire Petroleum LLC | Cottonwood Heights, UT 84121 | Oil & Gas Operator | Jun 2019 |
| 112 | Enable Gas Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 113 | Enable Oklahoma Intrastate Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2022 |
| 114 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Feb 2024 |
| 115 | Encino Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | May 2026 |
| 116 | Encore Operating Inc | Edmond, OK 73013-5417 | Oil Operator | Jan 2026 |
| 117 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Feb 2026 |
| 118 | Endeavor Drilling, Inc. | Wagoner, OK 74467 | Oil Operator | Jan 2026 |
| 119 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 120 | Endeavor Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 121 | Endevco Eureka LLC | Oklahoma City, OK 73102-9211 | Oil & Gas Operator | Apr 2014 |
| 122 | Endicott Melvin F | Ponca City, OK 74601 | Oil & Gas Operator | Apr 2001 |
| 123 | Enerco Energy Corporation | Norman, OK 73069-6643 | Oil & Gas Operator | Apr 2020 |
| 124 | Enerfin Gathering-East LLC | Houston, TX 77077 | Oil & Gas Operator | Nov 2022 |
| 125 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |
| 126 | Energas Corporation | Oklahoma City, OK 73105 | Oil & Gas Operator | Jul 2025 |
| 127 | Energex Corp | Springfield, MO 65807 | Oil & Gas Operator | Feb 2026 |
| 128 | Energex Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 2026 |
| 129 | Energon Oil, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | May 2026 |
| 130 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2025 |
| 131 | Energy Environment Inc | Holdenville, OK 74848-0765 | Oil & Gas Operator | Jul 2016 |
| 132 | Energy Exchange Corporation | Oklahoma City, OK 73112 | Oil Operator | Jan 2026 |
| 133 | Energy Group Of America, Inc. | Hollister, MO 65672 | Oil Operator | May 2026 |
| 134 | Energy Lease Service Inc | Drumright, OK 74030-7403 | Oil & Gas Operator | Jan 2026 |
| 135 | Energy Operating Corporation | Plano, TX 75093-4409 | Oil & Gas Operator | Sep 2013 |
| 136 | Energy Operations Oklahoma LP | Houston, TX 77002-6785 | Oil & Gas Operator | Nov 2010 |
| 137 | Energy Production Services LLC | Oklahoma City, OK 73162-4736 | Oil & Gas Operator | Apr 2020 |
| 138 | Energy Resources Dev Inc | Bixby, OK 74008-3658 | Oil & Gas Operator | Jan 2026 |
| 139 | Energy Support Services LLC | Cheyenne, WY 82001 | Oil & Gas Operator | Jan 2025 |
| 140 | Energy Three Inc. | Jackson, MS 39211 | Oil & Gas Operator | Jan 2026 |
| 141 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2026 |
| 142 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2026 |
| 143 | Energyquest Management, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2021 |
| 144 | Enernet Inc | Oklahoma City, OK 73102-8004 | Oil & Gas Operator | Nov 2014 |
| 145 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2026 |
| 146 | Enersearch Inc | Sand Springs, OK 74063 | Oil & Gas Operator | Dec 2013 |
| 147 | Enersource Petroleum Inc | Bixby, OK 74008 | Oil & Gas Operator | Jan 2026 |
| 148 | Enersource Royalty Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2013 |
| 149 | Enertec Corporation | Nowata, OK 74048-0632 | Oil & Gas Operator | Sep 2018 |
| 150 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2026 |
| 151 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 152 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 153 | England Operating LLC | Littleton, CO 80120-4529 | Oil & Gas Operator | Nov 2014 |
| 154 | Enhanced Hydrocarbons Inc | Claremore, OK 74017 | Oil & Gas Operator | May 2013 |
| 155 | Enloe Jenny L | Skiatook, OK 74070 | Oil Operator | Nov 1998 |
| 156 | Enmark Gas Gathering LP | Dallas, TX 75252 | Oil & Gas Operator | Dec 2025 |
| 157 | Ennex Inc | | Oil & Gas Operator | Oct 1993 |
| 158 | Ennis Bill H | Sasakwa, OK 74867-0001 | Oil & Gas Operator | Sep 2014 |
| 159 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 160 | Ensight Energy Group Inc | Richardson, TX 75080-2370 | Oil & Gas Operator | Jan 2026 |
| 161 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |
| 162 | Enterprise Energy Exploration Inc | Tulsa, OK 74133-6724 | Oil & Gas Operator | Feb 2026 |
| 163 | Enterprise Energy Prod Co Inc | Tulsa, OK 74133-6754 | Oil & Gas Operator | Mar 2015 |
| 164 | Enterprise Exploration Inc | Tulsa, OK 74133 | Oil & Gas Operator | Nov 2020 |
| 165 | Enterprising Enterprises Inc | Tulsa, OK 74137 | Oil Operator | Jun 2009 |
| 166 | Entex Petroleum Inc | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 1997 |
| 167 | Entransco Energy LLC | Dewey, OK 74029 | Oil & Gas Operator | Oct 2024 |
| 168 | Envirotek Fuel Systems Inc | Dallas, TX 75243 | Oil & Gas Operator | May 2013 |
| 169 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 170 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | May 2026 |
| 171 | Eok Operating LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jan 2026 |
| 172 | Eott Energy Operating LP | Houston, TX 77210-4666 | Oil & Gas Operator | Oct 2009 |
| 173 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 174 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 175 | Epley Bobbie Inc | Wilson, OK 73463-6319 | Oil Operator | Jun 2007 |
| 176 | Epoch Resources Of Texas Inc | Port Aransas, TX 78373-1637 | Oil & Gas Operator | Nov 2014 |
| 177 | Epperson Dwight | Okemah, OK 74859 | Oil Operator | Jan 2013 |
| 178 | Epperson John R | Bartlesville, OK 74003 | Oil Operator | Aug 1999 |
| 179 | Equal Energy Us Inc | Tulsa, OK 74103-4621 | Oil & Gas Operator | Nov 2019 |
| 180 | Equinox Oil Company Inc | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 181 | Equipment Lott Inc The | Hennessey, OK 73742-0655 | Oil & Gas Operator | Mar 2008 |
| 182 | Equity Drilling Company Inc | Dewey, OK 74029 | Oil & Gas Operator | Nov 1998 |
| 183 | Eratz Investments Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2026 |
| 184 | Ernst Petroleum Company Inc | Arlington, VA 22201 | Oil & Gas Operator | Aug 2013 |
| 185 | Erwin, James D. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1993 |
| 186 | Erwin, Sanford P | | Oil & Gas Operator | Apr 2019 |
| 187 | Escher Corporation | Oklahoma City, OK 73120 | Oil & Gas Operator | Aug 2025 |
| 188 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 189 | Escott Oil Inc | Nowata, OK 74048 | Oil & Gas Operator | Feb 2000 |
| 190 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Jan 2026 |
| 191 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 192 | Eskridge Oil & Supply | Tulsa, OK 74105 | Oil Operator | Aug 2014 |
| 193 | Eskridge Production Company | Tulsa, OK 74112-1428 | Oil Operator | Sep 2019 |
| 194 | Eslick Nancy Sue | Bristow, OK 74010-3873 | Oil Operator | Aug 2013 |
| 195 | Esper Production Co | Arlington, TX 76011-2427 | Oil & Gas Operator | Apr 2015 |
| 196 | Esperanza Energy Corp. | Prosper, TX 75078 | Oil & Gas Operator | Mar 2015 |
| 197 | Essex Energy Inc | Yukon, OK 73099-5126 | Oil & Gas Operator | Apr 2014 |
| 198 | Essman Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2019 |
| 199 | Estate Oil & Gas LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2026 |
| 200 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |