| 101 | Endurance Operating LLC | | Oil & Gas Operator | Dec 2024 |
| 102 | Enduro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2018 |
| 103 | Enerco Exploration & MGMT. Co. | | Oil & Gas Operator | Aug 1981 |
| 104 | Enercorp Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 1993 |
| 105 | Enerfin Field Services LLC | Houston, TX 77077 | Oil Operator | Nov 2024 |
| 106 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 107 | Energen Resources Maq Inc | Birmingham, AL 35203 | Oil & Gas Operator | Sep 2000 |
| 108 | Energy Corp. Of America, Inc. | | Oil & Gas Operator | Aug 1998 |
| 109 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 110 | Energy Exploration Co | | Oil & Gas Operator | Feb 1991 |
| 111 | Energy Finders, Inc. | | Oil & Gas Operator | Dec 1981 |
| 112 | Energy Investments Inc. | | Oil & Gas Operator | Oct 2025 |
| 113 | Energy Management Company Of Texas | | Oil & Gas Operator | Dec 2024 |
| 114 | Energy Management Corp. | | Oil & Gas Operator | Apr 1999 |
| 115 | Energy Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 116 | Energy Partners, LTD. | New Orleans, LA 70170 | Oil & Gas Operator | Aug 2012 |
| 117 | Energy Prod Management Corp | | Oil & Gas Operator | Oct 1991 |
| 118 | Energy Production Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 119 | Energy Program Accompany | | Oil Operator | Dec 2006 |
| 120 | Energy Properties Inc. | | Oil & Gas Operator | Dec 2023 |
| 121 | Energy Prospector'S Inc | | Oil & Gas Operator | Jun 1997 |
| 122 | Energy Recovery Group LLC | | Oil & Gas Operator | Jul 2008 |
| 123 | Energy Research & Dev. Corp. | | Oil & Gas Operator | Feb 1998 |
| 124 | Energy Reserves GP-Kanaba Oil | | Oil & Gas Operator | Aug 1985 |
| 125 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 126 | Energy Reserves Group LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2018 |
| 127 | Energy Resource Associates Inc | | Gas Operator | Nov 1988 |
| 128 | Energy Resource Technology Gom, LLC | | Oil & Gas Operator | Oct 2019 |
| 129 | Energy Resources Of Amer Inc | Columbiana, OH 44408 | Oil & Gas Operator | Dec 2021 |
| 130 | Energy Resources Oil & Gas Corp. | Amarillo, TX 79102 | Oil & Gas Operator | Jun 1994 |
| 131 | Energy RSRVS GRP-Lavino-Traver | | Oil & Gas Operator | Aug 1985 |
| 132 | Energy Self-Service Oils, Inc. | | Oil & Gas Operator | Apr 2009 |
| 133 | Energy Source, Inc.-Emerald | | Oil & Gas Operator | Apr 1983 |
| 134 | Energy Sources, Inc. | | Oil & Gas Operator | Nov 1990 |
| 135 | Energy Xxi Gom, LLC | | Oil & Gas Operator | Dec 2023 |
| 136 | Energy Xxi Gulf Coast, Inc. | | Oil & Gas Operator | Dec 2008 |
| 137 | Energy Xxi Onshore, LLC | | Oil & Gas Operator | Dec 2023 |
| 138 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Nov 2025 |
| 139 | Energyquest Management, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2021 |
| 140 | Energyquest Operating, L.L.C. | | Oil & Gas Operator | Jun 2023 |
| 141 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2025 |
| 142 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 143 | Enervest Production Partners, LTD. | | Gas Operator | Nov 2024 |
| 144 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 145 | Engeo Co. | | Oil & Gas Operator | Nov 1986 |
| 146 | English Oil & Gas | | Oil Operator | Sep 2021 |
| 147 | English Oil And Gas, L.L.C. | | Oil Operator | Sep 2021 |
| 148 | Enlink Lig, LLC | | Oil Operator | Jan 2025 |
| 149 | Ennex Inc | | Oil & Gas Operator | Oct 1993 |
| 150 | Enpower Resources Inc. | Sugar Land, TX 77479 | Oil & Gas Operator | Feb 2026 |
| 151 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 152 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 153 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 154 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 155 | Ensight IV Energy Management,LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 156 | Ensight Resources, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 157 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |
| 158 | Enstar Petroleum Company | | Oil & Gas Operator | Aug 1985 |
| 159 | Enstar Petroleum, Inc. | | Oil & Gas Operator | Jan 1984 |
| 160 | Enterprise Gathering LLC | | Oil Operator | Dec 2024 |
| 161 | Enterprise Resources Inc. | | Oil & Gas Operator | Jun 1979 |
| 162 | Entex Petroleum Inc | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 1997 |
| 163 | Entex, Inc. | | Oil & Gas Operator | Dec 1984 |
| 164 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 165 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 166 | EP Operating Co, A LTD Ptrship | | Oil & Gas Operator | Oct 1992 |
| 167 | EP Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Jan 1993 |
| 168 | EP&W | | Oil Operator | Dec 1997 |
| 169 | Epl Oil & Gas, Inc | | Oil & Gas Operator | Aug 2015 |
| 170 | Epoch Petroleum Corporation | | Oil & Gas Operator | Dec 1992 |
| 171 | Equinox Oil Company Inc | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 172 | Equipment, Inc. | | Oil & Gas Operator | Mar 1983 |
| 173 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 174 | Equity Monroe Associates | | Gas Operator | Nov 1990 |
| 175 | Equity Monroe Partners | | Gas Operator | Nov 1990 |
| 176 | Eram, Inc. | | Oil & Gas Operator | Dec 2024 |
| 177 | Ereunao Oil & Gas, Inc. | | Oil & Gas Operator | Mar 2003 |
| 178 | Ergon Exploration, Inc. | | Oil & Gas Operator | Jun 2023 |
| 179 | Ergon, Inc. | | Oil & Gas Operator | Dec 2005 |
| 180 | Erin Exploration Associates | | Oil & Gas Operator | Mar 1987 |
| 181 | Ernest Starkey, Jr. | | Oil & Gas Operator | Feb 1985 |
| 182 | Eroc Gathering Company, LP | | Oil Operator | Jul 2014 |
| 183 | Erskine Energy, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Feb 2026 |
| 184 | Erskine Operating LLC | Houston, TX 77079 | Oil & Gas Operator | Dec 2007 |
| 185 | Erwin W. Saye | | Oil & Gas Operator | Apr 1979 |
| 186 | Esquire Oil And Gas LLC | | Oil & Gas Operator | Jan 2011 |
| 187 | Essex Corporation | | Oil Operator | Jan 1983 |
| 188 | Essex Corporation Of Louisiana | | Oil Operator | Dec 1997 |
| 189 | Est Of WM G Helis (A Partnership) | | Oil & Gas Operator | Dec 2009 |
| 190 | Est. Of H. L. Hunt | | Oil & Gas Operator | Jun 1983 |
| 191 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 192 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 193 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 194 | Etc Oil Corp | | Oil & Gas Operator | Mar 1994 |
| 195 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 196 | Etd Oil Co. | | Oil Operator | Oct 1990 |
| 197 | Ethredge & Rhoads Oil Company | | Oil Operator | Dec 2012 |
| 198 | Ethredge Oil Company | | Oil & Gas Operator | Aug 1998 |
| 199 | Ethyl Gas Company, LLC | | Oil Operator | Jan 2025 |
| 200 | Ethyl Properties Inc | | Oil & Gas Operator | Aug 1989 |