| 101 | Engel Farms Corporation | Liberal, KS 67901 | Gas Operator | Mar 2003 |
| 102 | Engel Investments LLC | Hays, KS 67601 | Oil Operator | Oct 2024 |
| 103 | Enmark Gas Gathering LP | Dallas, TX 75252 | Oil & Gas Operator | May 2025 |
| 104 | Enoch Oil | Wichita, KS 67216 | Oil Operator | Jan 2001 |
| 105 | Enron Corporatio | | Oil & Gas Operator | Aug 1999 |
| 106 | Ensign Oil & Gas Inc. | | Oil & Gas Operator | Jul 1993 |
| 107 | Ensign Operating | | Oil & Gas Operator | Oct 1994 |
| 108 | Ensminger D & J | | Oil Operator | Dec 1994 |
| 109 | Ensminger Energy LLC | Moran, KS 66755 | Oil Operator | Jun 2025 |
| 110 | Ensminger Oil, LLC | Moran, KS 66755 | Oil Operator | Jun 2025 |
| 111 | Ensminger, Donald & Jack, A General Partnership | Moran, KS 66755 | Oil Operator | Jun 2005 |
| 112 | Ensz, Jerry | Sublette, KS 67877 | Gas Operator | Jun 2025 |
| 113 | Enterprise Inc | Hays, KS 67601 | Oil Operator | Sep 2015 |
| 114 | Enterprise Marke | | Oil & Gas Operator | Oct 1992 |
| 115 | Enterprise Oil Marketing Corp. | Little Rock, AR 72206 | Oil Operator | Sep 1998 |
| 116 | Enterra Resources, LLC | Edmond, OK 73083 | Oil & Gas Operator | Jun 2025 |
| 117 | Entransco Energy LLC | Dewey, OK 74029 | Oil & Gas Operator | Oct 2024 |
| 118 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 119 | Epoc, LLC | Andover, KS 67002 | Oil Operator | Jun 2025 |
| 120 | Eps Resources Corp | Englewood, CO 80111 | Oil & Gas Operator | Dec 2009 |
| 121 | Equinox Oil Comp | | Oil Operator | Dec 1996 |
| 122 | Equinox Oil Company Inc | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 123 | Erbe, Dwayne E. (Estate) | Neodesha, KS 66757 | Oil Operator | Apr 2025 |
| 124 | Erbert Don Oil C | | Oil Operator | May 1993 |
| 125 | Erbert, Harold | Iola, KS 66749 | Oil Operator | Dec 1992 |
| 126 | Ernst & Steinle | | Oil Operator | Oct 1991 |
| 127 | Ers Operating Company LLC | Bothell, WA 98012 | Oil & Gas Operator | Jun 2016 |
| 128 | Escher Corporation | Oklahoma City, OK 73120 | Oil & Gas Operator | Aug 2025 |
| 129 | Esp Development, Inc. | Salina, KS 67401 | Oil Operator | Jun 2025 |
| 130 | Essex Resources, LLC | Coffeyville, KS 67337 | Oil Operator | Jun 2025 |
| 131 | Estate Of Crawford Oil & Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Aug 2006 |
| 132 | Eternity Exploration, LLC | Coppell, TX 75019 | Oil Operator | Feb 2025 |
| 133 | Eufaula Enterpri | | Oil & Gas Operator | Mar 1986 |
| 134 | Euram Petroleum | | Oil Operator | Apr 1986 |
| 135 | Evans Douglas G | | Oil Operator | Aug 1987 |
| 136 | Evans Energy, LLC | Mount Hope, KS 67108 | Oil & Gas Operator | Jun 2025 |
| 137 | Evans Jay Oil Co | Iola, KS 66749 | Oil Operator | Apr 2001 |
| 138 | Evans John Roy | | Oil Operator | Nov 1992 |
| 139 | Evans Oil D W - | | Oil Operator | Mar 1992 |
| 140 | Evans Oil Inc. | Lebo, KS 66856 | Oil Operator | Jun 2025 |
| 141 | Evans Well Service | | Oil Operator | Oct 2013 |
| 142 | Evans, Glenn A. | Paola, KS 66071 | Oil Operator | Oct 1989 |
| 143 | Evenson Oil Oper | | Oil Operator | Nov 1991 |
| 144 | Everglow Energy, LLC | Oklahoma City, OK 73162 | Oil & Gas Operator | Jun 2025 |
| 145 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 146 | Evertson Oil Company Inc | Kimball, NE 69145 | Oil & Gas Operator | Sep 2001 |
| 147 | Evolution Oil & | | Oil & Gas Operator | Apr 1993 |
| 148 | Excalibur Prod C | | Oil & Gas Operator | Jun 1995 |
| 149 | Excalibur Production Company, Inc. | McPherson, KS 67460 | Oil & Gas Operator | Jun 2025 |
| 150 | Excel Oil & Gas L.L.C. | Bucyrus, KS 66013 | Oil Operator | Jun 2025 |
| 151 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Aug 2025 |
| 152 | Exodus Gas & Oil LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2024 |
| 153 | Exok Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Aug 2025 |
| 154 | Extreme Energy Co | | Oil & Gas Operator | Jun 2025 |
| 155 | Exxon Corporatio | | Oil & Gas Operator | Dec 1995 |
| 156 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 157 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 158 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Aug 2025 |