| 101 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 102 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 103 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 104 | Etoco, L.P. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 105 | Ettco Enterprises, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2024 |
| 106 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 107 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Nov 2025 |
| 108 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Feb 2026 |
| 109 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 110 | Fair Oil, LC | Tyler, TX 75710 | Oil & Gas Operator | Oct 2001 |
| 111 | Fair Oil, LTD. | Tyler, TX 75710 | Oil & Gas Operator | Feb 2026 |
| 112 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 113 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | Feb 2026 |
| 114 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Feb 2026 |
| 115 | Fireside Oil And Gas, Inc. | West Monroe, LA 71294 | Oil & Gas Operator | Feb 2002 |
| 116 | Flat Creek Operating Co. | Rockwall, TX 75087 | Oil & Gas Operator | Jun 2004 |
| 117 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 118 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Feb 2026 |
| 119 | Fossil Resources, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Oct 2017 |
| 120 | Four Seas Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Dec 2019 |
| 121 | Fullspike Energy LLC | Boyd, TX 76023 | Oil & Gas Operator | Feb 2026 |
| 122 | Garrison Operating, L.L.C. | Tomball, TX 77375 | Oil & Gas Operator | Feb 2026 |
| 123 | Giant Energy Corp. | Dallas, TX 75230 | Oil & Gas Operator | Jul 2019 |
| 124 | Giant NRG Co., LP | Dallas, TX 75230 | Oil & Gas Operator | Feb 2026 |
| 125 | Goldsmith Operating, LLC | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 126 | Goldsmith, J. Paul | Tyler, TX 75711 | Oil & Gas Operator | Feb 1997 |
| 127 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 128 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 129 | Graward Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 2026 |
| 130 | Graystone Energy Corporation | Judson, TX 75660 | Oil & Gas Operator | Feb 2026 |
| 131 | Grimes Energy Company | Abilene, TX 79604 | Oil & Gas Operator | Mar 2005 |
| 132 | Halliburton Operating Company | Plano, TX 75093 | Oil & Gas Operator | Feb 2026 |
| 133 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 134 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Feb 2026 |
| 135 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 136 | Harrison Interests, LTD. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 137 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 138 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 139 | Hereford, J. A. Industries, Inc. | Nacogdoches, TX 75961 | Oil & Gas Operator | Feb 2026 |
| 140 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | Feb 2026 |
| 141 | Hill, Bill | Kilgore, TX 75663 | Oil Operator | Mar 2014 |
| 142 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 143 | Holditch, S.A. & Assoc. Inc. | College Sta, TX 77840 | Oil & Gas Operator | Apr 1994 |
| 144 | HRB Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Feb 2026 |
| 145 | Hurley Petroleum Corporation | Baton Rouge, LA 70821 | Oil & Gas Operator | Feb 2000 |
| 146 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 147 | Indigo Minerals LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 148 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 149 | Inland Oil And Gas Company, Inc. | Chireno, TX 75937 | Oil & Gas Operator | Jun 2005 |
| 150 | J-O'B Op/Stone & Webster Co Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Mar 1995 |
| 151 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Feb 2026 |
| 152 | Jacobi-Johnson Energy, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 1998 |
| 153 | Jandar Exploration | Henderson, TX 75653 | Oil & Gas Operator | Dec 1994 |
| 154 | Jandar Exploration, L. C. | Tyler, TX 75703 | Oil & Gas Operator | Feb 2026 |
| 155 | JCC Energy, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 156 | Jess Energy Company | Tyler, TX 75710 | Oil & Gas Operator | Sep 1997 |
| 157 | Jil Oil Corp. | San Antonio, TX 78279 | Oil & Gas Operator | Feb 2026 |
| 158 | Justiss Oil Company, Inc. | Jena, LA 71342 | Oil & Gas Operator | Nov 2025 |
| 159 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Feb 2026 |
| 160 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | Feb 2026 |
| 161 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Feb 2026 |
| 162 | KJ Energy, LLC | MT Enterprise, TX 75681 | Oil & Gas Operator | Jul 2024 |
| 163 | Kraker & Martin Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2011 |
| 164 | Lamay Corporation | Rosenberg, TX 77471 | Oil & Gas Operator | Feb 2026 |
| 165 | Lancer Petroleum Corporation | Irving, TX 75014 | Oil & Gas Operator | Feb 2014 |
| 166 | Lease Holders Acquisitions LLC | Yukon, OK 73099 | Gas Operator | Feb 2026 |
| 167 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Feb 2026 |
| 168 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 169 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 170 | Linn Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 171 | Little & Whyte Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Mar 2008 |
| 172 | LKD Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2018 |
| 173 | Long Trusts, The | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 174 | Longbranch Energy, LP | Center, TX 75935 | Oil & Gas Operator | Feb 2026 |
| 175 | Lorac, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Feb 2026 |
| 176 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | Feb 2026 |
| 177 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 178 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2025 |
| 179 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 180 | Marshall, A. B. | Houston, TX 77050 | Oil & Gas Operator | Sep 1995 |
| 181 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 182 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Feb 2026 |
| 183 | McAlmond Oil Company | Fort Worth, TX 76136 | Oil & Gas Operator | Apr 2022 |
| 184 | McBee Operating Company, L.L.C. | Dallas, TX 75209 | Oil & Gas Operator | Feb 2026 |
| 185 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 186 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 187 | MHM Pipeline Co., Inc. | Dallas, TX 75252 | Oil & Gas Operator | Feb 2026 |
| 188 | Monitor O&G, L.L.C. | Frisco, TX 75034 | Oil & Gas Operator | Jan 2016 |
| 189 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 190 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | Feb 2026 |
| 191 | New Dawn Energy, LLC | Houston, TX 77077 | Gas Operator | Feb 2026 |
| 192 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 193 | North American Reserve Corp. | Houston, TX 77060 | Oil & Gas Operator | Oct 2010 |
| 194 | North Lake Resources LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | Feb 2026 |
| 195 | Now Development Co., Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2017 |
| 196 | O'Benco, Inc. | Shreveport, LA 71136 | Oil & Gas Operator | Feb 2026 |
| 197 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 198 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 199 | Ovation Energy II, LP | Houston, TX 77279 | Oil & Gas Operator | Jun 2011 |
| 200 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |