| 101 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 102 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 103 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 104 | Etoco, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 105 | Etx Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2022 |
| 106 | Exploration Company, The | San Antonio, TX 78258 | Oil & Gas Operator | Jun 2010 |
| 107 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 108 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 109 | Fair Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 2000 |
| 110 | Fair Oil, LC | Tyler, TX 75710 | Oil & Gas Operator | Oct 2001 |
| 111 | Fair Oil, LTD. | Tyler, TX 75710 | Oil & Gas Operator | Jul 2025 |
| 112 | Falcon Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2021 |
| 113 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 114 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Jul 2025 |
| 115 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 116 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 117 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Jul 2025 |
| 118 | Four - S Oil Company, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2008 |
| 119 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Jul 2025 |
| 120 | Gardner Energy Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 1999 |
| 121 | Garrison Operating, L.L.C. | Tomball, TX 77375 | Oil & Gas Operator | Jul 2025 |
| 122 | Gel Petroleum, Inc. | Bay City, TX 77414 | Oil & Gas Operator | Jul 2025 |
| 123 | Genecov Group, Inc. The | Tyler, TX 75713 | Oil & Gas Operator | Dec 2002 |
| 124 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2025 |
| 125 | Global Natural Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | May 1998 |
| 126 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 127 | Graward Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Jul 2025 |
| 128 | Great West Energy & Expl., Inc. | Addison, TX 75001 | Oil & Gas Operator | Mar 2008 |
| 129 | Gulf Tide Oil Company, The | Houston, TX 77008 | Oil & Gas Operator | Jun 1999 |
| 130 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 131 | Hampton Resources Corporation | Houston, TX 77010 | Oil & Gas Operator | Mar 1996 |
| 132 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Jul 2025 |
| 133 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 134 | Hawn Brothers | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2003 |
| 135 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 136 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 137 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Jul 2025 |
| 138 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Jul 2025 |
| 139 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 140 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 141 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Jul 2025 |
| 142 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 143 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 144 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 145 | Hydrogeo, L.L.C. | Houston, TX 77074 | Oil & Gas Operator | Jul 2025 |
| 146 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 147 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 148 | Interstate Explorations LLC | Houston, TX 77010 | Oil & Gas Operator | Jul 2025 |
| 149 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Jul 2025 |
| 150 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Jul 2025 |
| 151 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Jul 2025 |
| 152 | Jandar Exploration | Henderson, TX 75653 | Oil & Gas Operator | Dec 1994 |
| 153 | Juneau Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 154 | Justiss Oil Company, Inc. | Jena, LA 71342 | Oil & Gas Operator | Mar 2025 |
| 155 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2025 |
| 156 | Kalos Corporation | Tyler, TX 75701 | Oil & Gas Operator | Jul 2025 |
| 157 | Katy Resources Etx, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2011 |
| 158 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2025 |
| 159 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | Jul 2025 |
| 160 | Kiva Resources Inc. | Houston, TX 77265 | Oil & Gas Operator | Mar 2008 |
| 161 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Jul 2025 |
| 162 | Kraker & Martin Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2011 |
| 163 | Krenek Enterprises, Inc. | Lovelady, TX 75851 | Oil Operator | Jul 2025 |
| 164 | L.J.M. Corporation | Houston, TX 77025 | Oil & Gas Operator | Jun 2012 |
| 165 | Layline Energy I LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2019 |
| 166 | Lease Holders Acquisitions LLC | Yukon, OK 73099 | Gas Operator | Jul 2025 |
| 167 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Jul 2025 |
| 168 | Live Oak Gas Company | Dallas, TX 75251 | Oil & Gas Operator | Jul 2025 |
| 169 | Llog Exploration Texas, L.P. | Covington, LA 70433 | Oil & Gas Operator | Jul 2025 |
| 170 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 171 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 172 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | May 2025 |
| 173 | Mahfouz Energy Company | Houston, TX 77255 | Oil & Gas Operator | Nov 2020 |
| 174 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Jul 2025 |
| 175 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 176 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 177 | Maverick Energy & Dev. Corp. | Austin, TX 78746 | Oil & Gas Operator | Jul 2025 |
| 178 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 179 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 180 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 181 | McBay Company | Grapeland, TX 75844 | Oil & Gas Operator | Feb 2002 |
| 182 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Jul 2025 |
| 183 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 184 | Means Oil Co. | Corsicana, TX 75110 | Oil & Gas Operator | Feb 2013 |
| 185 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 186 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 187 | Midcoast G & P (East Texas) L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 188 | Miller Energy Inc | Houston, TX 77024 | Oil & Gas Operator | Oct 2016 |
| 189 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 190 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 191 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 192 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 193 | Mortimer Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2003 |
| 194 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Jul 2025 |
| 195 | Mustang Drilling, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Aug 2024 |
| 196 | Mustang Drilling, LTD. | Henderson, TX 75653 | Oil & Gas Operator | May 2008 |
| 197 | Navarro Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 198 | Navidad Resources, LLC | Bullard, TX 75757 | Oil & Gas Operator | Jul 2025 |
| 199 | New Gulf Resources, LLC | Tulsa, OK 74133 | Oil & Gas Operator | May 2018 |
| 200 | Newco Oil And Gas, LLC | McKinney, TX 75070 | Oil Operator | Jul 2025 |