| 101 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 102 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | Feb 2026 |
| 103 | Can-Tex Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Nov 2003 |
| 104 | Capataz Operating Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2020 |
| 105 | Caprock Exploration, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Feb 2026 |
| 106 | Carrland Oil & Gas Inc. | Prosper, TX 75078 | Oil & Gas Operator | Feb 2026 |
| 107 | Cass Energy Corp | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 108 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 109 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2026 |
| 110 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 111 | Chevron Midcontinent, L.P. | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 112 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 113 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 114 | Cinnabar Operating, LLC | Fort Worth, TX 76121 | Oil & Gas Operator | Feb 2026 |
| 115 | Circle H Oil Company | Big Spring, TX 79721 | Oil & Gas Operator | Apr 2020 |
| 116 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Feb 2026 |
| 117 | Civitas Permian Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2026 |
| 118 | Clear Water Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 119 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 120 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2026 |
| 121 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 122 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 123 | COG Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 124 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 125 | Comstock Energy, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2026 |
| 126 | Concho Oilfield Serv & Oper Co. | Eden, TX 76837 | Oil & Gas Operator | Feb 2026 |
| 127 | Concho Resources Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2004 |
| 128 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 129 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 130 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 131 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 132 | Coronado Minerals, LLC | Houston, TX 77208 | Oil & Gas Operator | Feb 2026 |
| 133 | Costa Resources, Inc. | Dallas, TX 75209 | Oil & Gas Operator | Aug 2003 |
| 134 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 135 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 136 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 137 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 138 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 139 | Crownquest Operating, LLC | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 140 | Crystal River Oil & Gas LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2023 |
| 141 | Cuatro Oil And Gas Corporation | Abilene, TX 79603 | Oil & Gas Operator | Feb 2026 |
| 142 | Currie Cattle Co. | Big Spring, TX 79720 | Oil & Gas Operator | Sep 2007 |
| 143 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 144 | Dakota Resources, Inc | Midland, TX 79707 | Oil & Gas Operator | Nov 2025 |
| 145 | Dallas Operating Corp. | Dallas, TX 75205 | Oil & Gas Operator | Nov 2006 |
| 146 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 147 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2025 |
| 148 | De Central Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 149 | De Compiegne Prop. Co. 20, The | Midland, TX 79702 | Oil Operator | Oct 2019 |
| 150 | De IV Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 151 | De Operating LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2017 |
| 152 | De V Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 153 | De3 Operating LLC | Irving, TX 75038 | Oil & Gas Operator | Jun 2021 |
| 154 | Desert Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 155 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 156 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 157 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 158 | Diamondback E&P LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 159 | Dickson Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2000 |
| 160 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 161 | Discovery Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 162 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Feb 2026 |
| 163 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 164 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 165 | Dorland, D. L. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 166 | Dorland, D. L. Estate Of | Midland, TX 79702 | Oil & Gas Operator | Nov 1994 |
| 167 | Dorland, D. L. Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 1994 |
| 168 | Double Eagle Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 169 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Feb 2026 |
| 170 | Draco Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 171 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 172 | Dyad Petroleum Company | Midland, TX 79710 | Oil & Gas Operator | Sep 2021 |
| 173 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 174 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2025 |
| 175 | Edmar Company, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 176 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 177 | El Paso Field Services Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 178 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 179 | El Paso Production Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | Feb 2026 |
| 180 | Element Petroleum Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2015 |
| 181 | Elephant Oil & Gas, LLC | Dallas, TX 75204 | Oil & Gas Operator | Nov 2015 |
| 182 | Elita, Inc. | Dallas, TX 75214 | Oil & Gas Operator | Dec 2016 |
| 183 | Ellison Lease Operating | Bridgeport, TX 76426 | Oil & Gas Operator | Feb 2026 |
| 184 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 185 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 186 | Energen Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2021 |
| 187 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Nov 2025 |
| 188 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 189 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 190 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 191 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 192 | Eqt Production Texas, LLC | Pittsburgh, PA 15222 | Oil & Gas Operator | Jun 2018 |
| 193 | Esperanza Energy Corp. | Prosper, TX 75078 | Oil & Gas Operator | Mar 2015 |
| 194 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 195 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 196 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 197 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 198 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Feb 2026 |
| 199 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 200 | Fagadau Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2006 |