| 101 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 102 | Chi Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 103 | Chisos Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 104 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | May 2025 |
| 105 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 106 | Chuza Operating | Midland, TX 79710 | Oil & Gas Operator | Sep 2006 |
| 107 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 108 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 109 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 110 | CJRW Oil & Gas | MC Camey, TX 79752 | Oil Operator | May 2025 |
| 111 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | May 2025 |
| 112 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | May 2025 |
| 113 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | May 2025 |
| 114 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 115 | Coastal Management Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 116 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 117 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 118 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 119 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 120 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 121 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 122 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | May 2025 |
| 123 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 124 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | May 2025 |
| 125 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 126 | Copper Ridge Resources LLC | Midland, TX 79710 | Oil Operator | Feb 2025 |
| 127 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 128 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | May 2025 |
| 129 | Coronado Minerals, LLC | Houston, TX 77208 | Oil & Gas Operator | May 2025 |
| 130 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 131 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | May 2025 |
| 132 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 133 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 134 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 135 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 136 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 137 | Cox Exploration, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1999 |
| 138 | Cox, Robert G. & Associates,Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 1994 |
| 139 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 140 | Crosstex Services, L.L.C. | Tuscola, TX 79562 | Oil Operator | May 2025 |
| 141 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 142 | D & H Production, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2024 |
| 143 | D G D Oil Co. | Imperial, TX 79743 | Oil & Gas Operator | May 2025 |
| 144 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | May 2025 |
| 145 | Dakota Resources, Inc. (I) | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 146 | Dallas Operating Corp. | Dallas, TX 75205 | Oil & Gas Operator | Nov 2006 |
| 147 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 148 | Darkens Oil & Gas Inc. | MC Camey, TX 79752 | Oil & Gas Operator | May 2025 |
| 149 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 150 | Deg Energy, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Feb 2007 |
| 151 | Delek Energy Systems Us Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 152 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 153 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 154 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 155 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 156 | Dewey Petroleum | Midland, TX 79707 | Oil & Gas Operator | Dec 2020 |
| 157 | Diamond M Oil Co., Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2025 |
| 158 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 159 | Dickson Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2000 |
| 160 | Dillard, A. W., Jr. | Midland, TX 79701 | Oil & Gas Operator | Jan 1995 |
| 161 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 162 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 163 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | May 2025 |
| 164 | Driscoll S.W.D. Inc. | San Antonio, TX 78229 | Oil & Gas Operator | May 2025 |
| 165 | DSR Oil & Gas, Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2025 |
| 166 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Mar 2025 |
| 167 | Dune Oil And Gas, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Aug 2006 |
| 168 | Dunigan Petroleum, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 169 | Durham, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2016 |
| 170 | Eagle Rock Operating Company,LLC | Houston, TX 77252 | Oil & Gas Operator | Oct 2015 |
| 171 | Earnest Producing Corporation | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 172 | Eddie'S Royalties, Inc. | Rising Star, TX 76471 | Oil & Gas Operator | May 2025 |
| 173 | Emerald Production Company | Midland, TX 79702 | Oil & Gas Operator | Jun 1995 |
| 174 | Eminent Oil & Gas, Inc. | Houston, TX 77077 | Oil & Gas Operator | May 2025 |
| 175 | Enable Midstream Partners, LP | Oklahoma City, OK 73124 | Oil Operator | Sep 2023 |
| 176 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 177 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 178 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Apr 2025 |
| 179 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 180 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Mar 2025 |
| 181 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 182 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 183 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 184 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 185 | Eureka Prospecting Company | Wimberley, TX 78676 | Oil & Gas Operator | Jun 2023 |
| 186 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 187 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 188 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 189 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 190 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Feb 2025 |
| 191 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |
| 192 | Falcon Creek Resources, Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Apr 2001 |
| 193 | Fasken Oil And Ranch, LTD. | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 194 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | May 2025 |
| 195 | Fed Operating LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 196 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | May 2025 |
| 197 | Fenway Energy Development Co. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 198 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 199 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | May 2025 |
| 200 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | May 2025 |