| 101 | Bowman, Fred Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2014 |
| 102 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 103 | Braman, D. H., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Dec 2008 |
| 104 | Brayton Oil Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Dec 1994 |
| 105 | Brayton Operating Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Sep 2009 |
| 106 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 107 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 108 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 109 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 110 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 111 | Britanco, L.L.C. | Falls City, TX 78113 | Oil & Gas Operator | Apr 2026 |
| 112 | Bruington Operating, L.L.C. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2015 |
| 113 | Bse Production Co. | Victoria, TX 77903 | Oil & Gas Operator | Apr 2026 |
| 114 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2026 |
| 115 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 116 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | Apr 2026 |
| 117 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Apr 2026 |
| 118 | Cabeza Oil And Gas, LLC | Austin, CO 81410 | Oil & Gas Operator | Mar 2022 |
| 119 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2026 |
| 120 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 121 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 122 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2005 |
| 123 | Camden Resources, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2008 |
| 124 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 125 | Camoil, Inc. | Columbus, TX 78934 | Oil & Gas Operator | Apr 2026 |
| 126 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | Apr 2026 |
| 127 | Capital A Corp. | San Antonio, TX 78279 | Oil & Gas Operator | Jun 2002 |
| 128 | Cardinal Operating Corporation | Waxahachie, TX 75165 | Oil & Gas Operator | Jan 1997 |
| 129 | Carol-Holly Oil Corporation | Denver, CO 80237 | Oil & Gas Operator | Jan 2026 |
| 130 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 131 | Carter E&P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Dec 2016 |
| 132 | Carter Exploration Company | Corpus Christ, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 133 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Apr 2026 |
| 134 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 135 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Apr 2026 |
| 136 | CB Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2017 |
| 137 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Apr 2026 |
| 138 | Central Gulf Petroleum Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2026 |
| 139 | Centurion Exploration Company | Houston, TX 77042 | Oil & Gas Operator | May 2009 |
| 140 | Century Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Apr 2026 |
| 141 | Chandler Oil & Gas, LLC | Beeville, TX 78102 | Oil & Gas Operator | Apr 2026 |
| 142 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 143 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2026 |
| 144 | Charro Operating, L.L.C. | Englewood, CO 80112 | Oil & Gas Operator | Apr 2026 |
| 145 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2026 |
| 146 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 147 | Chesnutt Oil & Gas, Inc. | Mineral, TX 78125 | Oil & Gas Operator | Apr 2026 |
| 148 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 149 | Chiodo Corp. | San Antonio, TX 78232 | Oil & Gas Operator | Apr 2026 |
| 150 | Chisholm Oil & Gas, LC | Buda, TX 78610 | Oil & Gas Operator | Apr 2026 |
| 151 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2026 |
| 152 | Cibolo Energy Operating, Inc. | Bulverde, TX 78163 | Oil & Gas Operator | Apr 2026 |
| 153 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 154 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 155 | Cimarron Engineering Corp. | Kingsville, TX 78364 | Oil & Gas Operator | May 2015 |
| 156 | Cimarron Engineering, LLC | Kingsville, TX 78364 | Oil & Gas Operator | Apr 2026 |
| 157 | Cinco Natural Resources Corp | La Grange, TX 78945 | Oil & Gas Operator | Apr 2026 |
| 158 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | Apr 2026 |
| 159 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 160 | Clide Oil Corp. | Iraan, TX 79744 | Oil & Gas Operator | Nov 2015 |
| 161 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 162 | CLR Gauging Corp. | Tuleta, TX 78162 | Oil & Gas Operator | Apr 2026 |
| 163 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | Apr 2026 |
| 164 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Apr 2026 |
| 165 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 166 | Coastline Exploration, Inc. | Stafford, TX 77477 | Oil & Gas Operator | Apr 2026 |
| 167 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 168 | Cody Energy LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2020 |
| 169 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Feb 2026 |
| 170 | Collins Resources, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Mar 2011 |
| 171 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 172 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 173 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 174 | Consolidated Petro PTNRS I, LLC | Austin, TX 78759 | Oil & Gas Operator | Mar 2003 |
| 175 | Continental Exploration LLC | Richardson, TX 75080 | Oil & Gas Operator | Apr 2026 |
| 176 | Corda Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 177 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Apr 2026 |
| 178 | Corenergy Operating Group, LLC | Houston, TX 77074 | Oil & Gas Operator | Apr 2026 |
| 179 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 180 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 181 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 182 | Cowrie Energy LLC | Austin, TX 78703 | Oil & Gas Operator | Apr 2026 |
| 183 | Creston Petroleum Corp. | Dallas, TX 75380 | Oil & Gas Operator | Apr 2026 |
| 184 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 185 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 186 | CXL Energy LLC | Canada, 00100 | Oil & Gas Operator | Apr 2026 |
| 187 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Apr 2026 |
| 188 | Dale Operating Company | Dallas, TX 75207 | Oil & Gas Operator | Apr 2026 |
| 189 | Dartex Energy Corporation | Austin, TX 78731 | Oil & Gas Operator | Apr 2026 |
| 190 | Dasbek Energy, L.L.C. | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2026 |
| 191 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 192 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2025 |
| 193 | Dekalb Energy Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 1996 |
| 194 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 195 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 196 | Desco Oil Company | Houston, TX 77056 | Oil & Gas Operator | Feb 2017 |
| 197 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 198 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 199 | Dewbre Petroleum Corporation | Corpus Christ, TX 78404 | Oil & Gas Operator | Apr 2026 |
| 200 | Dinero Oil Corporation | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Nov 1999 |