| 101 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 102 | Denali Oil & Gas Management LLC | Houston, TX 77060 | Oil & Gas Operator | Dec 2012 |
| 103 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Apr 2026 |
| 104 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 105 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 106 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 107 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 108 | DJ Exploration, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Apr 2026 |
| 109 | DSTJ Corporation | Montgomery, TX 77316 | Oil & Gas Operator | Mar 2001 |
| 110 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 111 | Dynamic Production, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2026 |
| 112 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2026 |
| 113 | Eca Holdings, L.P. | Sugar Land, TX 77478 | Oil & Gas Operator | Mar 2010 |
| 114 | Eex E&P Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 115 | El Paso Production Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | Apr 2026 |
| 116 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Apr 2026 |
| 117 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 118 | Energy Corporation Of America | Charleston, WV 25311 | Oil & Gas Operator | Dec 2024 |
| 119 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2025 |
| 120 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 121 | Energy Reserves Group LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2018 |
| 122 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2026 |
| 123 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 124 | Engelke, R. H. | San Antonio, TX 78230 | Oil & Gas Operator | Apr 2026 |
| 125 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 126 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 127 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 128 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 129 | Etoco, L.P. | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 130 | Everest Resource Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2026 |
| 131 | Evolution Resources, LLC | Houston, TX 77070 | Oil & Gas Operator | Apr 2026 |
| 132 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Apr 2026 |
| 133 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2026 |
| 134 | F-W Oil Interests, Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2006 |
| 135 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 136 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 137 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Apr 2026 |
| 138 | First Solid Energy Group, LP | Missouri City, TX 77489 | Oil & Gas Operator | Apr 2026 |
| 139 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Apr 2026 |
| 140 | Flare Resources Inc. | Houston, TX 77002 | Gas Operator | Jun 2006 |
| 141 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 142 | Forney Oil Corporation | Houston, TX 77056 | Oil & Gas Operator | Jan 1998 |
| 143 | Forrest Energy, LLC | Hattiesburg, MS 39401 | Oil & Gas Operator | Feb 1998 |
| 144 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Apr 2026 |
| 145 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 146 | Fueled Resources Inc | Boyd, TX 76023 | Oil & Gas Operator | Apr 2026 |
| 147 | Fulshear Oil & Gas Partners LP | Houston, TX 77002 | Gas Operator | Apr 2018 |
| 148 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Apr 2026 |
| 149 | Galt Petroleum, Inc. | Iowa Park, TX 76367 | Oil Operator | Apr 2026 |
| 150 | Gardner Energy Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 1999 |
| 151 | Garrison LTD. | San Antonio, TX 78257 | Oil & Gas Operator | Apr 2026 |
| 152 | Gary Oil & Gas | Deer Park, TX 77536 | Oil & Gas Operator | Apr 2026 |
| 153 | Gasper Rice Resources, LTD. | Houston, TX 77068 | Oil & Gas Operator | Apr 2026 |
| 154 | Gec Operating, Inc. | Houston, TX 77024 | Oil & Gas Operator | Apr 2026 |
| 155 | Geiselman, Grover J. | Richmond, TX 77469 | Oil & Gas Operator | Feb 1995 |
| 156 | Gemini Exploration Company | Dallas, TX 75219 | Oil & Gas Operator | Mar 1997 |
| 157 | Glickenhaus Energy Corporation | Houston, TX 77027 | Oil & Gas Operator | Apr 2026 |
| 158 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 159 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | Apr 2026 |
| 160 | Gordy Oil Company | Houston, TX 77007 | Oil & Gas Operator | Apr 2026 |
| 161 | Grand Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Feb 2026 |
| 162 | Great Northern Energy, Inc | Irving, TX 75039 | Oil & Gas Operator | Apr 2026 |
| 163 | Great Western Onshore Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 164 | Greco Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 165 | Greco Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 166 | Greenhill Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Jan 1998 |
| 167 | Greylock Conventional, LLC | Charleston, WV 25311 | Oil & Gas Operator | Feb 2026 |
| 168 | Greylock Opco LLC | Charleston, WV 25311 | Oil & Gas Operator | Dec 2025 |
| 169 | Gsi Oil & Gas, Inc. | Bryan, TX 77806 | Oil & Gas Operator | Apr 2026 |
| 170 | Gulf States Production Company | Houston, TX 77027 | Oil & Gas Operator | Aug 1997 |
| 171 | GWM Operating Company, LLC | Sugar Land, TX 77496 | Oil & Gas Operator | Apr 2026 |
| 172 | H-M Resource Management, Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2023 |
| 173 | Halex Oil Corporation | Houston, TX 77057 | Oil & Gas Operator | Apr 2026 |
| 174 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 175 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Apr 2026 |
| 176 | Hankey Oil Company | Houston, TX 77027 | Oil & Gas Operator | Feb 2010 |
| 177 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 178 | Hanson Production Company | Cuero, TX 77954 | Oil & Gas Operator | Jul 2009 |
| 179 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 180 | Harrison Interests, LTD. | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 181 | Harrison, Dan J III&Bruce F Est | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 182 | Harrison, Dan J. III&Bruce F. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 183 | Hart Petroleum Services, Inc | Corpus Christ, TX 78410 | Oil & Gas Operator | Jul 2025 |
| 184 | High Plains Gas Systems, Inc. | Houston, TX 77019 | Oil & Gas Operator | Apr 2026 |
| 185 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Apr 2026 |
| 186 | Hilty Interests, Inc. | Kerrville, TX 78028 | Oil & Gas Operator | Jun 1989 |
| 187 | Horizon Exploration Company | Houston, TX 77019 | Oil & Gas Operator | Aug 2002 |
| 188 | Horizon Prod. And Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Apr 2026 |
| 189 | Hou-Tex, Inc. | Houston, TX 77224 | Oil & Gas Operator | Jun 2001 |
| 190 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 191 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Apr 2026 |
| 192 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 193 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2002 |
| 194 | Hurd Enterprises, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2026 |
| 195 | Hurricane Oil And Gas Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | Mar 2008 |
| 196 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 197 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Apr 2026 |
| 198 | Irish Oil & Gas Co. | Houston, TX 77242 | Oil & Gas Operator | Aug 2003 |
| 199 | Iwr Operating, LLC | Dallas, TX 75248 | Oil Operator | Apr 2026 |
| 200 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Apr 2026 |