| 101 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 102 | Crawford Energy Operating Co | Houston, TX 77056 | Oil & Gas Operator | Aug 2008 |
| 103 | Crawford Hughes Operating Co. | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 104 | Crebbs Oil Company | Batson, TX 77519 | Oil & Gas Operator | Jun 2024 |
| 105 | Crestmont Operating LLC | New York, NY 10151 | Oil Operator | May 2025 |
| 106 | Crimson Exploration Inc. | Houston, TX 77060 | Oil & Gas Operator | Apr 2006 |
| 107 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 108 | Crown Petroleum Corp. | Oklahoma City, OK 73106 | Oil & Gas Operator | May 2025 |
| 109 | Csa Exploration Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Aug 2003 |
| 110 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | May 2025 |
| 111 | Davis Asset Management, Inc. | Houston, TX 77010 | Oil & Gas Operator | Dec 2004 |
| 112 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 113 | Davis Southern Operating Co LLC | Houston, TX 77004 | Oil & Gas Operator | May 2025 |
| 114 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | May 2025 |
| 115 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 116 | Delaware Davis Petroleum Corp. | Houston, TX 77056 | Oil & Gas Operator | Jan 2000 |
| 117 | Dogwood Operating Company, Inc. | Houston, TX 77069 | Oil & Gas Operator | May 2025 |
| 118 | Drum, Delton | Liberty, TX 77575 | Oil & Gas Operator | Jul 2005 |
| 119 | DSTJ Corporation | Montgomery, TX 77316 | Oil & Gas Operator | Mar 2001 |
| 120 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | May 2025 |
| 121 | E & B Equipment | Liberty, TX 77575 | Oil & Gas Operator | Feb 2010 |
| 122 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 123 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 124 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 125 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 126 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 127 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 128 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 129 | Engroup Resources, L.P. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 130 | Enline Operating, L.L.C. | Houston, TX 77019 | Oil & Gas Operator | Jun 1998 |
| 131 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 132 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 133 | Evans, Julian | Houston, TX 77024 | Oil & Gas Operator | Nov 1995 |
| 134 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Feb 2025 |
| 135 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 136 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 137 | F.I.G. Energy, LLC | Livingston, TX 77399 | Oil & Gas Operator | May 2025 |
| 138 | Fairways Exploration & Production, LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 139 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 140 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 141 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 142 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 143 | Flint Interests, LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 144 | Foothills Texas, Inc. | Houston, TX 77269 | Oil & Gas Operator | Aug 2019 |
| 145 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 146 | Foster Well Service, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Jan 2000 |
| 147 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | May 2025 |
| 148 | Foundation Oil Company, Inc. | Kingwood, TX 77325 | Oil & Gas Operator | May 2025 |
| 149 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 150 | Fusion XP, Inc. | Arlington, TX 76006 | Oil Operator | Apr 2014 |
| 151 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 152 | G.A.P. Production LLC | Sourlake, TX 77659 | Oil Operator | May 2025 |
| 153 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | May 2025 |
| 154 | Gary Oil & Gas | Deer Park, TX 77536 | Oil & Gas Operator | May 2025 |
| 155 | Ghost Road, LLC | Batson, TX 77519 | Oil Operator | May 2025 |
| 156 | Glickenhaus Energy Corporation | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 157 | Global Natural Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | May 1998 |
| 158 | Goldking Onshore Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2016 |
| 159 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 160 | Gordy Oil Company | Houston, TX 77007 | Oil & Gas Operator | May 2025 |
| 161 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | May 2025 |
| 162 | Grayrock Energy II, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | May 2025 |
| 163 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 164 | H.E.R. Operating, LLC | Silsbee, TX 77656 | Oil & Gas Operator | May 2025 |
| 165 | H.K.E. | Stafford, TX 77497 | Oil & Gas Operator | May 2025 |
| 166 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | May 2025 |
| 167 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 168 | Hanson Production Company | Cuero, TX 77954 | Oil & Gas Operator | Jul 2009 |
| 169 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | May 2025 |
| 170 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 171 | Hennig Production Co., Inc. | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 172 | Heritage Operating Co., Inc. The | Stafford, TX 77497 | Oil & Gas Operator | May 1997 |
| 173 | High Plains Gas Systems, Inc. | Houston, TX 77019 | Oil & Gas Operator | May 2025 |
| 174 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | May 2025 |
| 175 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | May 2025 |
| 176 | Hopkins, T. M. Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 177 | Hosford Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 1994 |
| 178 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 179 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 180 | Howard Exploration, Inc. | Houston, TX 77069 | Oil & Gas Operator | May 2025 |
| 181 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 182 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | May 2025 |
| 183 | Hughes, Dan A. Company | Beeville, TX 78104 | Oil & Gas Operator | May 2006 |
| 184 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 185 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 186 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 187 | Intercoastal Energy, Inc. | Houston, TX 77055 | Oil & Gas Operator | Aug 2003 |
| 188 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 189 | Ipact | Austin, TX 78734 | Oil & Gas Operator | May 2025 |
| 190 | J K Exploration & Production Inc | Fullerton, CA 92832 | Oil & Gas Operator | May 2025 |
| 191 | J3 Operating LLC | Spurger, TX 77660 | Oil & Gas Operator | Aug 2024 |
| 192 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | May 2025 |
| 193 | Jay Management Company LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 194 | Jeffcoat Production Company Inc. | Spurger, TX 77660 | Oil & Gas Operator | Oct 2024 |
| 195 | Jenco Petroleum Corporation | The Woodlands, TX 77380 | Oil Operator | May 2025 |
| 196 | Jenex Petroleum Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 197 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 198 | Kelpetro, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2012 |
| 199 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 200 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | May 2025 |