| 101 | DDC & T Operating Company, Inc | | Oil & Gas Operator | Jul 2005 |
| 102 | Delta Petroleum Inc | Houston, TX 77269-1007 | Oil & Gas Operator | May 2009 |
| 103 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 104 | Dewey E. Williams | | Oil Operator | Nov 1978 |
| 105 | Dewey Williams | | Oil Operator | Mar 1992 |
| 106 | Dews Production LLC | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 107 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Dec 2025 |
| 108 | Divine'S Service & Repairs Inc | | Oil & Gas Operator | Mar 1997 |
| 109 | Don Townes | | Oil Operator | Sep 2000 |
| 110 | Doran & Braddock & Nelson Petr | | Oil Operator | Feb 1982 |
| 111 | Dorcheat Oil & Gas, LLC | | Oil & Gas Operator | Dec 2024 |
| 112 | Dorchester Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2001 |
| 113 | Dossie Dews | | Oil & Gas Operator | Dec 2024 |
| 114 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Dec 2025 |
| 115 | Dual Energy, Inc. | | Oil & Gas Operator | Oct 2022 |
| 116 | Duke Energy Field Services Inc | | Oil Operator | Mar 2000 |
| 117 | Duke Energy Field Services LLC | | Oil Operator | Dec 2006 |
| 118 | E-Z Mart Stores, Inc. | | Oil Operator | Jul 2004 |
| 119 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 120 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 121 | Elysium Jennings, LLC | | Oil & Gas Operator | Dec 2024 |
| 122 | Endurance Operating LLC | | Oil & Gas Operator | Dec 2024 |
| 123 | Energy Program Accompany | | Oil Operator | Dec 2006 |
| 124 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Oct 2025 |
| 125 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 126 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 127 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 128 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 129 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 130 | Est. Of H. L. Hunt | | Oil & Gas Operator | Jun 1983 |
| 131 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 132 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 133 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 134 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Dec 2025 |
| 135 | Excel Operating Corporation | | Oil & Gas Operator | Dec 2024 |
| 136 | F.E.Hargraves &Sons DRL.Co.Inc. | | Oil & Gas Operator | Mar 1992 |
| 137 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 138 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 139 | Fontainebleau Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 140 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 141 | Fortune Gas & Oil, Inc. | | Oil & Gas Operator | Apr 2004 |
| 142 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Dec 2025 |
| 143 | Foster-Brown Operations, Inc. | | Oil & Gas Operator | Apr 2003 |
| 144 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Dec 2025 |
| 145 | Four Star Oil Company | | Oil & Gas Operator | May 2015 |
| 146 | Fran Oil, Inc. | | Oil & Gas Operator | Dec 2024 |
| 147 | Franks & Petrofunds, Inc. | | Oil & Gas Operator | Sep 1989 |
| 148 | Franks Operating Company, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 149 | Franks Petroleum Inc. | | Oil & Gas Operator | Nov 1994 |
| 150 | Franks Petroleum, Inc. Et Al | | Oil & Gas Operator | Oct 1989 |
| 151 | Fre-Lyn, Inc. | | Oil Operator | Feb 1985 |
| 152 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 153 | G & S Oil Company | | Oil & Gas Operator | Dec 2024 |
| 154 | Gas Masters Of America | | Oil & Gas Operator | Oct 1993 |
| 155 | Gemini Explorations, Inc. | | Oil & Gas Operator | Jan 2025 |
| 156 | General American Oil Co Of TX | | Oil & Gas Operator | Jun 1983 |
| 157 | Geo Co., Inc. | Austin, TX 78745 | Oil Operator | Apr 1988 |
| 158 | Georgetown Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 1995 |
| 159 | Gish & McBead | | Oil Operator | Jan 1989 |
| 160 | GMX Resources, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2014 |
| 161 | GNR Production Services Inc | | Oil Operator | Oct 2001 |
| 162 | Goldco Operating LLC | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 163 | Goldsberry Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 164 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | Dec 2025 |
| 165 | Graham Energy LTD | Houston, TX 77024 | Oil & Gas Operator | Mar 1994 |
| 166 | Greer Energy, Inc. | | Oil Operator | Dec 1996 |
| 167 | Grenadier Energy Partners II,LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2020 |
| 168 | Griffin Operating | | Oil & Gas Operator | Mar 1995 |
| 169 | Grit Operating, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2023 |
| 170 | Gulf South Minerals, Inc. | | Oil Operator | Nov 1993 |
| 171 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 172 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 173 | Gulf States Pipeline Corp. | | Oil & Gas Operator | May 2003 |
| 174 | H & H Oil Company | | Oil & Gas Operator | Jun 2025 |
| 175 | Hardey Co., The | Shreveport, LA 71107 | Oil & Gas Operator | Dec 2025 |
| 176 | Hardy Oil & Gas USA Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1996 |
| 177 | Harold H. Hollenshead | | Oil & Gas Operator | May 2002 |
| 178 | Hassie Hunt Expl. Co. | | Oil & Gas Operator | Aug 2008 |
| 179 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 180 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 181 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 182 | Helena Production Corp | | Oil & Gas Operator | Dec 1991 |
| 183 | Highlands Operating Co., Inc. | | Oil & Gas Operator | May 1990 |
| 184 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Dec 2025 |
| 185 | Huggs Incorporated, Et Al | | Oil & Gas Operator | Feb 1998 |
| 186 | Hunt Oil Co., Et Al | | Oil & Gas Operator | Nov 1992 |
| 187 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 188 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 189 | Hyman Muslow | | Oil Operator | Jun 1995 |
| 190 | Indigo Minerals LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 191 | Intercoastal Operating Co. | | Oil Operator | Dec 1980 |
| 192 | J L M Investments, Inc. | | Oil Operator | Jan 1986 |
| 193 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Dec 2025 |
| 194 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Dec 2025 |
| 195 | J. G. Floyd | | Oil Operator | Jun 1985 |
| 196 | J. L. Dews | | Oil Operator | Jan 2025 |
| 197 | J. V. Wynn | | Oil & Gas Operator | Dec 1991 |
| 198 | J.L.H. Enterprises, Inc. | | Oil & Gas Operator | Mar 1989 |
| 199 | Jae Exploration & Development | | Oil & Gas Operator | Sep 1993 |
| 200 | Jag Operating, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2019 |