| 101 | Crystal Oil & Land Company | | Oil & Gas Operator | Apr 2002 |
| 102 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 103 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | May 2024 |
| 104 | Cypress Partners, Inc. | Houston, TX 77068 | Oil & Gas Operator | May 1999 |
| 105 | D H & L Operating, Inc. | | Oil & Gas Operator | Sep 1983 |
| 106 | D. B. Braddock | | Oil & Gas Operator | Jan 1986 |
| 107 | D. B. McConnell | | Oil & Gas Operator | Oct 1991 |
| 108 | D. B. McConnell Et Al | | Oil & Gas Operator | Nov 1993 |
| 109 | D. J. Fritz | | Oil & Gas Operator | Feb 1982 |
| 110 | D.J.F. Petroleum Corporation | | Oil & Gas Operator | Oct 1992 |
| 111 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 112 | Dallas DRLG. & Development Co. | | Oil & Gas Operator | Apr 1987 |
| 113 | Danos Oil & Gas LLC | | Oil & Gas Operator | Nov 2023 |
| 114 | Decker & Associates | | Oil & Gas Operator | Mar 1991 |
| 115 | Delhi Gas Pipeline Corporation | Palestine, TX 75802 | Oil & Gas Operator | Feb 1998 |
| 116 | Desoto Gas Corporation | | Oil & Gas Operator | Oct 1986 |
| 117 | Desoto Gas Prod Co Inc-Zadeck | | Gas Operator | Jan 1990 |
| 118 | Desoto Gas Producing Co. Inc | | Oil & Gas Operator | Jan 1990 |
| 119 | Desoto Oil & Gas Corporation | | Oil & Gas Operator | Dec 1990 |
| 120 | Desperation Oil & Gas Co. | | Gas Operator | Jan 1989 |
| 121 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2024 |
| 122 | Diversified Natural Res., Inc. | | Oil Operator | May 2000 |
| 123 | Diversified Production LLC | Minden, LA 71055 | Oil & Gas Operator | May 2024 |
| 124 | Dome De Sel LLC | | Oil & Gas Operator | Dec 2023 |
| 125 | Dominion Midstream Services, LP | | Oil Operator | Dec 2006 |
| 126 | Donald J. Zadeck | | Oil & Gas Operator | Feb 1998 |
| 127 | Dorchester Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2001 |
| 128 | Dorothy F. Hamlin | | Oil Operator | Dec 1985 |
| 129 | DRD Operating Company | | Oil & Gas Operator | Feb 2014 |
| 130 | Dual Energy, Inc. | | Oil & Gas Operator | Oct 2022 |
| 131 | Duke Energy Field Services Inc | | Oil Operator | Mar 2000 |
| 132 | Duke Energy Field Services LLC | | Oil Operator | Dec 2006 |
| 133 | Dzurik Interests, Inc. | | Oil & Gas Operator | Nov 2023 |
| 134 | E Texas Production MGMT Co Inc | | Oil & Gas Operator | Oct 1996 |
| 135 | E. Conway Butts, Inc. | | Oil & Gas Operator | Apr 1991 |
| 136 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2024 |
| 137 | Eclipse Petroleum Corporation | La Grange, TX 78945 | Oil & Gas Operator | Aug 2003 |
| 138 | Eddy Enterprises, Inc. | | Oil & Gas Operator | Sep 2023 |
| 139 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 140 | Egh Operating, LLC | | Oil & Gas Operator | Nov 2023 |
| 141 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 142 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 143 | Eli Rebich | | Oil & Gas Operator | Dec 1986 |
| 144 | Ellora Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2024 |
| 145 | Ellora Operating, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2011 |
| 146 | Empresa Energy IV, LLC | | Oil & Gas Operator | Jul 2019 |
| 147 | Empresa Energy, LP | Houston, TX 77024 | Oil & Gas Operator | Jul 2009 |
| 148 | Enable Midstream Partners, LP | Oklahoma City, OK 73124 | Oil Operator | Sep 2023 |
| 149 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 150 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 151 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 152 | Enerco Exploration & MGMT. Co. | | Oil & Gas Operator | Aug 1981 |
| 153 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2023 |
| 154 | Energy Finders, Inc. | | Oil & Gas Operator | Dec 1981 |
| 155 | Energy Reserves GP-Kanaba Oil | | Oil & Gas Operator | Aug 1985 |
| 156 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 157 | Energy Sources, Inc. | | Oil & Gas Operator | Nov 1990 |
| 158 | Enlink Lig, LLC | | Oil Operator | Jan 2024 |
| 159 | Enpower Resources Inc. | Sugar Land, TX 77479 | Oil & Gas Operator | May 2024 |
| 160 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 161 | Ensight IV Energy Management,LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2024 |
| 162 | Enterprise Gathering LLC | | Oil Operator | Dec 2023 |
| 163 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 164 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 165 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Jan 2024 |
| 166 | Eroc Gathering Company, LP | | Oil Operator | Jul 2014 |
| 167 | Et Gathering & Processing LLC | San Antonio, TX 78258 | Oil Operator | Dec 2023 |
| 168 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 169 | Etc Texas Pipeline, LTD. | San Antonio, TX 78258 | Oil Operator | Sep 2023 |
| 170 | Ettco Enterprises, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2023 |
| 171 | Evans Brothers | | Oil & Gas Operator | Jan 2024 |
| 172 | Excalibur Resources, Inc. | | Oil & Gas Operator | Apr 1986 |
| 173 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | May 2024 |
| 174 | Excel Royalty Company, LLC | | Oil Operator | Jun 2022 |
| 175 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | May 2024 |
| 176 | Exco Partners Operating PTSHP LP | Dallas, TX 75251 | Oil & Gas Operator | Jan 2009 |
| 177 | Exco Production Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Dec 2009 |
| 178 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jan 2024 |
| 179 | Exco/Hgi JV Assets, LLC | Dallas, TX 75251 | Oil & Gas Operator | Jun 2014 |
| 180 | F.S.M. Oil Co. | | Oil Operator | Aug 1979 |
| 181 | Fair Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 2000 |
| 182 | Fair Oil, LC | Tyler, TX 75710 | Oil & Gas Operator | Oct 2001 |
| 183 | Fair Oil, LTD. | Tyler, TX 75710 | Oil & Gas Operator | May 2024 |
| 184 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | May 2024 |
| 185 | Fite Oil & Gas, Inc. | Shreveport, LA 71163 | Oil & Gas Operator | May 2024 |
| 186 | Fontainebleau Operating, LLC | | Oil & Gas Operator | Dec 2023 |
| 187 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 188 | Fortune Operating Company | Willis, TX 77378 | Oil & Gas Operator | May 2024 |
| 189 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | May 2024 |
| 190 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2024 |
| 191 | Fossil Operating, Inc. | Dallas, TX 75238 | Oil & Gas Operator | May 2024 |
| 192 | Four Star Oil Company | | Oil & Gas Operator | May 2015 |
| 193 | Fran Oil, Inc. | | Oil & Gas Operator | Dec 2023 |
| 194 | Franks Operating Company, L.L.C. | | Oil & Gas Operator | Jan 2024 |
| 195 | Franks Petroleum Inc. | | Oil & Gas Operator | Nov 1994 |
| 196 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 197 | G N K Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 198 | G. R. Goodwill | | Oil & Gas Operator | Jun 1997 |
| 199 | Geo Co., Inc. | Austin, TX 78745 | Oil Operator | Apr 1988 |
| 200 | George R Schurman | | Oil & Gas Operator | Oct 2015 |