| 101 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 102 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 103 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 104 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 105 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 106 | Erebor Resources, LLC | Tyler, TX 75702 | Oil & Gas Operator | Oct 2019 |
| 107 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 108 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 109 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 110 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 111 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 112 | Fair Oil, LC | Tyler, TX 75710 | Oil & Gas Operator | Oct 2001 |
| 113 | Fair Oil, LTD. | Tyler, TX 75710 | Oil & Gas Operator | Mar 2025 |
| 114 | Falcon Production LLC | Austin, TX 78715 | Oil & Gas Operator | Mar 2025 |
| 115 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 116 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Jan 2025 |
| 117 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 118 | Flint Pipeline Company | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 119 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 120 | Fortune Natural Resources Corp. | Houston, TX 77067 | Oil & Gas Operator | Dec 2003 |
| 121 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Mar 2025 |
| 122 | Frio Engineering Inc. | Houston, TX 77066 | Oil & Gas Operator | Mar 2025 |
| 123 | Geo-Vest Of Texas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2008 |
| 124 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 125 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 126 | Grand Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Dec 2020 |
| 127 | Graward Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Mar 2025 |
| 128 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Jan 2025 |
| 129 | GTG Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Mar 2025 |
| 130 | H & S Drilling Co Inc | Frazeysburg, OH 43822-0040-0040 | Oil & Gas Operator | Dec 2016 |
| 131 | H & S Production, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2004 |
| 132 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2024 |
| 133 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 134 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Mar 2025 |
| 135 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 136 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 137 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 138 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 139 | Herd Producing Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 140 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Mar 2025 |
| 141 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 142 | Hopewell Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 143 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 144 | Hugus Investment Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 145 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 146 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 147 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 148 | Inland Oil And Gas | Nacogdoches, TX 75961 | Oil & Gas Operator | Dec 1997 |
| 149 | Ipr Energy Partners, LLC | Bowie, TX 76230 | Oil & Gas Operator | Mar 2025 |
| 150 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Mar 2025 |
| 151 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Mar 2025 |
| 152 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Mar 2025 |
| 153 | Jandar Exploration, L. C. | Tyler, TX 75703 | Oil & Gas Operator | Mar 2025 |
| 154 | Jess Energy Company | Tyler, TX 75710 | Oil & Gas Operator | Sep 1997 |
| 155 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Mar 2025 |
| 156 | Kalos Corporation | Tyler, TX 75701 | Oil & Gas Operator | Mar 2025 |
| 157 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Mar 2025 |
| 158 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2024 |
| 159 | Kimbell Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 160 | Kinder Morgan Production Co LLC | Midland, TX 79705 | Oil & Gas Operator | Mar 2025 |
| 161 | King Operating Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Mar 2025 |
| 162 | Lace Operating | Fort Worth, TX 76114 | Oil & Gas Operator | Jun 1997 |
| 163 | Lacy Operations, LTD. | Longview, TX 75606 | Oil & Gas Operator | Oct 2012 |
| 164 | Lacy, F. B. Inc. | Houston, TX 77055 | Oil & Gas Operator | Sep 1997 |
| 165 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | Mar 2025 |
| 166 | Laron Oil Corporation | Seguin, TX 78155 | Oil & Gas Operator | Jul 1997 |
| 167 | Lease Holders Acquisitions LLC | Yukon, OK 73099 | Gas Operator | Mar 2025 |
| 168 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Mar 2025 |
| 169 | Lehnertz-Faulkner, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2023 |
| 170 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 171 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2025 |
| 172 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 173 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 174 | Long-Tex Exploration, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Mar 2025 |
| 175 | Lre Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2016 |
| 176 | LTS Oil & Gas | Lubbock, TX 79424 | Oil & Gas Operator | Mar 2025 |
| 177 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | Mar 2025 |
| 178 | M.B.J. Operating | Argyle, TX 76226 | Oil & Gas Operator | Jun 2022 |
| 179 | Machin & Associates, Inc. | Longview, TX 75606 | Oil & Gas Operator | Mar 2025 |
| 180 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 181 | Manziel Management Corporation | Tyler, TX 75711 | Oil Operator | Feb 2014 |
| 182 | Map Production Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 183 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 184 | Martin Foree Operating II, LLC | Royse City, TX 75189 | Oil & Gas Operator | Mar 2025 |
| 185 | Martin Foree Operating, LLC | Royse City, TX 75189 | Oil & Gas Operator | Mar 2025 |
| 186 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 187 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 188 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 189 | Meadows Oil Company | Plano, TX 75075 | Oil & Gas Operator | Aug 2004 |
| 190 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Mar 2025 |
| 191 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 192 | Mitchell Energy Company L.P. | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |
| 193 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 194 | ML Resources, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 195 | MLC Operating, LP | Houston, TX 77063 | Oil & Gas Operator | Mar 2025 |
| 196 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 197 | Mortimer Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2003 |
| 198 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 199 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Mar 2025 |
| 200 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |