| 101 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 102 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jun 2026 |
| 103 | Ellis Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | Sep 2026 |
| 104 | Elms Oil Company | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 105 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 106 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Apr 2026 |
| 107 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 108 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 109 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 110 | Erebor Resources, LLC | Tyler, TX 75702 | Oil & Gas Operator | Dec 2025 |
| 111 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 112 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Sep 2026 |
| 113 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jan 2026 |
| 114 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Sep 2026 |
| 115 | Fair Oil, LC | Tyler, TX 75710 | Oil & Gas Operator | Oct 2001 |
| 116 | Fair Oil, LTD. | Tyler, TX 75710 | Oil & Gas Operator | Sep 2026 |
| 117 | Falcon Production LLC | Austin, TX 78715 | Oil & Gas Operator | Sep 2026 |
| 118 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Sep 2026 |
| 119 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Jun 2026 |
| 120 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 121 | Flint Pipeline Company | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 122 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 123 | Fortune Natural Resources Corp. | Houston, TX 77067 | Oil & Gas Operator | Dec 2003 |
| 124 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Sep 2026 |
| 125 | Frio Engineering Inc. | Houston, TX 77066 | Oil & Gas Operator | Sep 2026 |
| 126 | Genecov Group, Inc. The | Tyler, TX 75713 | Oil & Gas Operator | Dec 2002 |
| 127 | Geo-Vest Of Texas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2008 |
| 128 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 129 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 130 | Grand Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Jun 2026 |
| 131 | Graward Operating, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Sep 2026 |
| 132 | Great American Resources Inc. | Bowie, TX 76230 | Oil & Gas Operator | Sep 2026 |
| 133 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | May 2026 |
| 134 | GTG Operating, LLC | Tyler, TX 75713 | Oil & Gas Operator | Sep 2026 |
| 135 | H & S Drilling Co Inc | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2016 |
| 136 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 137 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2026 |
| 138 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 139 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Sep 2026 |
| 140 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 141 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 142 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 143 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 144 | Herd Producing Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Sep 2026 |
| 145 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Sep 2026 |
| 146 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 147 | Hog Partnership LP | Dallas, TX 75235 | Gas Operator | Jul 2026 |
| 148 | Hopewell Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2026 |
| 149 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2002 |
| 150 | Hugus Investment Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Sep 2026 |
| 151 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 152 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 153 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 154 | Inland Oil And Gas | Nacogdoches, TX 75961 | Oil & Gas Operator | Dec 1997 |
| 155 | Ipr Energy Partners, LLC | Bowie, TX 76230 | Oil & Gas Operator | Sep 2026 |
| 156 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Sep 2026 |
| 157 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Sep 2026 |
| 158 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Sep 2026 |
| 159 | Jandar Exploration, L. C. | Tyler, TX 75703 | Oil & Gas Operator | Sep 2026 |
| 160 | Jess Energy Company | Tyler, TX 75710 | Oil & Gas Operator | Sep 1997 |
| 161 | Jil Oil Corp. | San Antonio, TX 78279 | Oil & Gas Operator | Sep 2026 |
| 162 | Johnson & Lindley, Inc. | Houston, TX 77227 | Oil & Gas Operator | May 2013 |
| 163 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Sep 2026 |
| 164 | Kalos Corporation | Tyler, TX 75701 | Oil & Gas Operator | Sep 2026 |
| 165 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Sep 2026 |
| 166 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jun 2026 |
| 167 | Kiamichi Oil & Gas | Whitehouse, TX 75791 | Oil Operator | Oct 1997 |
| 168 | Kimbell Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2026 |
| 169 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Sep 2026 |
| 170 | Lace Operating | River Oaks, TX 76114 | Oil & Gas Operator | Jun 1997 |
| 171 | Lacy Operations, LTD. | Longview, TX 75606 | Oil & Gas Operator | Oct 2012 |
| 172 | Lacy, F. B. Inc. | Houston, TX 77055 | Oil & Gas Operator | Sep 1997 |
| 173 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | Sep 2026 |
| 174 | Laron Oil Corporation | Seguin, TX 78155 | Oil & Gas Operator | Jul 1997 |
| 175 | Lasso Oil & Gas LLC | Dallas, TX 75360 | Oil & Gas Operator | Jul 2022 |
| 176 | Lease Holders Acquisitions LLC | Yukon, OK 73099 | Gas Operator | Sep 2026 |
| 177 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Sep 2026 |
| 178 | Lehnertz-Faulkner, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2023 |
| 179 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | May 2026 |
| 180 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 181 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 182 | Linn Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 183 | Long-Tex Exploration, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2026 |
| 184 | Los Hijos De Sanchez J LLC | Beeville, TX 78102 | Oil Operator | Sep 2026 |
| 185 | Lre Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2016 |
| 186 | LTS Oil & Gas | Lubbock, TX 79424 | Oil & Gas Operator | Sep 2026 |
| 187 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | Sep 2026 |
| 188 | M.B.J. Operating | Argyle, TX 76226 | Oil & Gas Operator | Jun 2022 |
| 189 | Machin & Associates, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 2026 |
| 190 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 191 | Manziel Management Corporation | Tyler, TX 75711 | Oil Operator | Feb 2014 |
| 192 | Map Production Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 193 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Jun 2026 |
| 194 | Martin Foree Operating II, LLC | Fate, TX 75132 | Oil & Gas Operator | Sep 2026 |
| 195 | Martin Foree Operating, LLC | Royse City, TX 75189 | Oil & Gas Operator | Sep 2026 |
| 196 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 197 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 198 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 199 | Meadows Oil Company | Plano, TX 75075 | Oil & Gas Operator | Aug 2004 |
| 200 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Sep 2026 |