| 101 | Endeavor Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 102 | Energy 2000, Inc. | Reno, NV 89501 | Oil & Gas Operator | Jul 2025 |
| 103 | Enerquest Operating, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jul 2025 |
| 104 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 105 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 106 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 107 | Erskine Energy, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Jul 2025 |
| 108 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 109 | Everest Resource Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jul 2025 |
| 110 | Evergreen Operating Co., LTD. | McAllen, TX 78502 | Oil & Gas Operator | Jul 2025 |
| 111 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Jul 2025 |
| 112 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 113 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 114 | Falcon Production Co. | Floresville, TX 78114 | Oil & Gas Operator | Jul 2025 |
| 115 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 116 | Firstrike Energy Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Jan 2025 |
| 117 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Jul 2025 |
| 118 | Flournoy Production Co. | Alice, TX 78333 | Oil & Gas Operator | Dec 2002 |
| 119 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 120 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Jul 2025 |
| 121 | Galilee Oil Investments LLC | San Antonio, TX 78205 | Oil & Gas Operator | Jul 2025 |
| 122 | Genesis Producing Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2007 |
| 123 | Gillring Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 1994 |
| 124 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 125 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | Jul 2025 |
| 126 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 127 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 128 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 129 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 130 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Jul 2025 |
| 131 | Harwood Exploration, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 1995 |
| 132 | Hawn Brothers Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jan 2003 |
| 133 | Headington Energy Partners, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2025 |
| 134 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 135 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 136 | Herschap Bros. | Bruni, TX 78344 | Oil & Gas Operator | Jul 2025 |
| 137 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Jul 2025 |
| 138 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Jul 2025 |
| 139 | Hugoton Operating Company, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 140 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Jul 2025 |
| 141 | Hunter & Hedrick Production, Inc | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Dec 1995 |
| 142 | Hurd Enterprises, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2025 |
| 143 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 144 | J Posey Operating LLC | Dayton, TX 77535 | Oil & Gas Operator | Jul 2025 |
| 145 | James Energy Corporation | Houston, TX 77227 | Oil & Gas Operator | Jan 1996 |
| 146 | Jamex II LTD., L.L.P. | Dallas, TX 75252 | Oil & Gas Operator | Sep 2002 |
| 147 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | Jul 2025 |
| 148 | K.M.A. Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 149 | Kaler Energy Corp. | Boerne, TX 78006 | Oil & Gas Operator | Jul 2025 |
| 150 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Jul 2025 |
| 151 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 152 | Kibbe, Anna S. | Falfurrias, TX 78355 | Oil & Gas Operator | Sep 1998 |
| 153 | L.T.D. Explorations Inc. | Alice, TX 78333 | Oil & Gas Operator | Jul 2025 |
| 154 | Lamay Corporation | Rosenberg, TX 77471 | Oil & Gas Operator | Jul 2025 |
| 155 | Legend Natural Gas IV, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 156 | Lighthouse Operating, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Jun 2021 |
| 157 | LMP Exploration Operating, LLC | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Feb 2008 |
| 158 | Lobo Resources, LTD. | Houston, TX 77077 | Oil & Gas Operator | Apr 1994 |
| 159 | Logas Energy, LLC | Lafayette, LA 70508 | Oil & Gas Operator | Jul 2025 |
| 160 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 161 | Loudon Exploration, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2008 |
| 162 | Loudon Operating Company, L.L.C. | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 163 | Lovelady, I. W. | Albuquerque, NM 87111 | Oil & Gas Operator | Jan 1996 |
| 164 | M. J. G., Inc. | Alice, TX 78333 | Oil & Gas Operator | Jul 2010 |
| 165 | Magnum Producing & Operating Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jan 2004 |
| 166 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2025 |
| 167 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 168 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Jul 2025 |
| 169 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 170 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 171 | Marwell Petroleum LTD Partnrship | Houston, TX 77027 | Oil & Gas Operator | Jul 2025 |
| 172 | Marwell Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2006 |
| 173 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 174 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | Jul 2025 |
| 175 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 176 | Messy Oil And Gas, LLC | Garwood, TX 77442 | Oil & Gas Operator | Jul 2025 |
| 177 | Mestena Operating, L.L.C. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 2015 |
| 178 | Mestena Operating, LTD. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jun 2009 |
| 179 | Mestena, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Nov 2001 |
| 180 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 181 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 182 | Millennium Exploration Co. LLC | San Antonio, TX 78232 | Oil & Gas Operator | Jul 2025 |
| 183 | Mission River Systems, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jul 2025 |
| 184 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 185 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 186 | Modern Exploration, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Jul 2025 |
| 187 | Mohican Oil & Gas, L.L.C. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Apr 2013 |
| 188 | Mohican Operating, L.L.C. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2021 |
| 189 | Mortimer Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2003 |
| 190 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 191 | Navajo Exploration, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Jul 2025 |
| 192 | Neuhaus, V. F. Properties, Inc. | Palmhurst, TX 78573 | Oil & Gas Operator | Dec 2022 |
| 193 | New Century Exploration, Inc. | Spring, TX 77379 | Oil & Gas Operator | Jul 2025 |
| 194 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |
| 195 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 196 | Nuevo Energy Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |
| 197 | Oil Well Buyers Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 198 | Okie Operating Company, LTD. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 199 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Jul 2025 |
| 200 | Opal Energy, Inc. | Katy, TX 77494 | Oil & Gas Operator | Jun 2009 |