| 101 | Demiran Production, Inc. | | Oil Operator | Mar 2008 |
| 102 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 103 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 104 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 105 | Dewey Williams | | Oil Operator | Mar 1992 |
| 106 | DGH Petroleum, Inc. | | Oil & Gas Operator | Aug 2011 |
| 107 | Discus Oil Corporation | | Oil & Gas Operator | Dec 2002 |
| 108 | Diversified Natural Res., Inc. | | Oil Operator | May 2000 |
| 109 | Divine'S Service & Repairs Inc | | Oil & Gas Operator | Mar 1997 |
| 110 | Don Webb | | Oil Operator | Mar 1984 |
| 111 | Donald & Danny Dews Production | | Oil Operator | Jan 2025 |
| 112 | Dossie Dews | | Oil & Gas Operator | Dec 2024 |
| 113 | Drmas, LLC | | Oil & Gas Operator | Nov 2024 |
| 114 | Dual Energy, Inc. | | Oil & Gas Operator | Oct 2022 |
| 115 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 116 | Dupont Oil Company | | Oil Operator | Feb 1998 |
| 117 | Dzurik Interests, Inc. | | Oil & Gas Operator | Dec 2024 |
| 118 | Eagle Oil & Gas, Inc. | | Oil & Gas Operator | Nov 1984 |
| 119 | Eagle Oil Management Co., LLC | | Oil & Gas Operator | Jan 2023 |
| 120 | Eclipse Services, Inc. * | La Grange, TX 78945 | Oil & Gas Operator | Jul 2003 |
| 121 | Egh Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 122 | El Paso Field Services Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 123 | Elizabeth Oil Company | | Oil Operator | Oct 1999 |
| 124 | Elysium Jennings, LLC | | Oil & Gas Operator | Dec 2024 |
| 125 | Emerald Oil Company, L.L.C. | E. Rochester, NY 14445 | Oil & Gas Operator | Jan 2025 |
| 126 | Empresa Energy IV, LLC | | Oil & Gas Operator | Aug 2019 |
| 127 | Empresa Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 128 | Enable Midstream Partners, LP | Oklahoma City, OK 73124 | Oil Operator | Sep 2023 |
| 129 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 130 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 131 | Endurance Operating LLC | | Oil & Gas Operator | Dec 2024 |
| 132 | Enerco Exploration & MGMT. Co. | | Oil & Gas Operator | Aug 1981 |
| 133 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2025 |
| 134 | Energy Program Accompany | | Oil Operator | Dec 2006 |
| 135 | Energy Sources, Inc. | | Oil & Gas Operator | Nov 1990 |
| 136 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2026 |
| 137 | Ensight IV Energy Management,LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 138 | Ensight Resources, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 139 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2026 |
| 140 | Eram, Inc. | | Oil & Gas Operator | Dec 2024 |
| 141 | Eroc Gathering Company, LP | | Oil Operator | Jul 2014 |
| 142 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 143 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 144 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 145 | Ettco Enterprises, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2024 |
| 146 | Eucutta Petroleum Inc. | | Oil & Gas Operator | Sep 2000 |
| 147 | Euroamerican Energy Group Inc | | Oil & Gas Operator | Oct 1993 |
| 148 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Apr 2026 |
| 149 | Excel Royalty Company, LLC | | Oil Operator | Jun 2022 |
| 150 | Exco Production Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Dec 2009 |
| 151 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Apr 2026 |
| 152 | F. E. Hargraves | | Oil Operator | Mar 1983 |
| 153 | F.E.Hargraves &Sons DRL.Co.Inc. | | Oil & Gas Operator | Mar 1992 |
| 154 | Fair Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 2000 |
| 155 | Faith Energy, L.L.C. | | Oil & Gas Operator | Jan 2025 |
| 156 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 157 | Fite Oil & Gas, Inc. | Shreveport, LA 71163 | Oil & Gas Operator | Apr 2026 |
| 158 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 159 | Fontainebleau Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 160 | Fortune Gas & Oil, Inc. | | Oil & Gas Operator | Apr 2004 |
| 161 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Apr 2026 |
| 162 | Fortune-Western | | Oil Operator | Dec 1989 |
| 163 | Four Star Oil Company | | Oil & Gas Operator | May 2015 |
| 164 | Fran Oil, Inc. | | Oil & Gas Operator | Dec 2024 |
| 165 | Frank J. Hall | | Oil & Gas Operator | Oct 1979 |
| 166 | Franks & McRae | | Oil & Gas Operator | Sep 1989 |
| 167 | Franks & Petrofunds, Inc. | | Oil & Gas Operator | Sep 1989 |
| 168 | Franks Operating Company, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 169 | Frontier Resources, Inc. | Dallas, TX 75214 | Oil & Gas Operator | Apr 2026 |
| 170 | G & S Oil Company | | Oil & Gas Operator | Dec 2024 |
| 171 | Gaines Operating, LLC | Austin, TX 78746 | Oil & Gas Operator | Apr 2026 |
| 172 | Gemini Explorations, Inc. | | Oil & Gas Operator | Jan 2025 |
| 173 | George A. Haddad, Jr. | | Oil & Gas Operator | Mar 2000 |
| 174 | George R Schurman | | Oil & Gas Operator | Oct 2015 |
| 175 | Gep Haynesville, LLC | | Gas Operator | Dec 2021 |
| 176 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 177 | Goldco Operating LLC | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 178 | Goldsberry Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 179 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 180 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 181 | Grayrock Corp., The | Dallas, TX 75243 | Oil & Gas Operator | Dec 1999 |
| 182 | Greer Energy, Inc. | | Oil Operator | Dec 1996 |
| 183 | Greystone Petroleum, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2026 |
| 184 | Griffin Energy | | Oil & Gas Operator | May 1991 |
| 185 | Grigsby Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2026 |
| 186 | Grit Operating, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2023 |
| 187 | Gulf South Operators, Inc. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2015 |
| 188 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 189 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 190 | Gulf States Pipeline Corp. | | Oil & Gas Operator | May 2003 |
| 191 | H&S Production, LLC | | Oil Operator | Nov 2024 |
| 192 | H. J. Bonner | | Oil & Gas Operator | Aug 1991 |
| 193 | Hall Engineering, Inc. | | Oil & Gas Operator | Jan 2007 |
| 194 | Hall-Hargraves, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 195 | Hanover Management Company | | Oil Operator | Aug 1979 |
| 196 | Hardey Co., The | Shreveport, LA 71107 | Oil & Gas Operator | Apr 2026 |
| 197 | Harold H. Hollenshead | | Oil & Gas Operator | May 2002 |
| 198 | Hartco Oil Co. | | Oil Operator | Jan 2025 |
| 199 | Haw Corporation | | Oil Operator | Dec 1979 |
| 200 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |