| 101 | Cal-Tex Fossil, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 102 | Calto Operating Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2004 |
| 103 | Canan Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2025 |
| 104 | Canyon Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 105 | Caribbean Energy, L.L.C. | Cotulla, TX 78014 | Oil & Gas Operator | Nov 2019 |
| 106 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 107 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 108 | Carter Energy Corporation | Duncanville, TX 75138 | Oil & Gas Operator | Sep 2010 |
| 109 | Cary Oil & Gas, Inc | Decatur, TX 76234 | Oil & Gas Operator | Sep 2025 |
| 110 | Case Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 111 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 112 | Caswell Bros. Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Sep 2025 |
| 113 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Sep 2025 |
| 114 | Century Petroleum, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2025 |
| 115 | Chance Oil Co., Inc. | Vernon, TX 76385 | Oil & Gas Operator | Jun 2025 |
| 116 | Chanze Oil Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 117 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Sep 2025 |
| 118 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 119 | Chico Production Corp. | Bowie, TX 76230 | Oil & Gas Operator | Sep 2025 |
| 120 | Chief Oil & Gas LLC | Dallas, TX 75225 | Oil & Gas Operator | Feb 2022 |
| 121 | Chiodo Corp. | San Antonio, TX 78232 | Oil & Gas Operator | Sep 2025 |
| 122 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 123 | Circle Ridge Production, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 124 | Circle-S Energy, LLC | McKinney, TX 75071 | Oil & Gas Operator | Sep 2025 |
| 125 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 126 | Clearfork Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2011 |
| 127 | Clearfork Production, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 128 | Co Energy | Benbrook, TX 76126 | Oil & Gas Operator | Sep 2025 |
| 129 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2025 |
| 130 | Colo Exploration Company, Inc. | Benbrook, TX 76126 | Oil & Gas Operator | Sep 2025 |
| 131 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 132 | Continental Export Corporation | Bowie, TX 76230 | Oil & Gas Operator | Sep 2013 |
| 133 | Cooke & Montague Oper. Co., Inc. | Flower Mound, TX 75028 | Oil & Gas Operator | Sep 2025 |
| 134 | Cooper Oil & Gas, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2025 |
| 135 | Corda Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2025 |
| 136 | Coreterra Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Sep 2025 |
| 137 | Corpening, Joe F. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 138 | Cox Operating Co. | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2000 |
| 139 | Creed Operating Co., LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2025 |
| 140 | Crest Operating Company | Houston, TX 77042 | Oil & Gas Operator | Sep 2025 |
| 141 | Crockett Operating, LLC | Arlington, TX 76017 | Oil & Gas Operator | Sep 2025 |
| 142 | Crossbow Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 143 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 144 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 145 | Cso Consulting | Bridgeport, TX 76426 | Oil & Gas Operator | Mar 2020 |
| 146 | Cuatro Petro Corp. | Richardson, TX 75080 | Oil & Gas Operator | Sep 2025 |
| 147 | Culebra Oil & Gas LLC | Kerrville, TX 78028 | Oil & Gas Operator | Sep 2025 |
| 148 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | Sep 2025 |
| 149 | Currie Cattle Co. | Big Spring, TX 79720 | Oil & Gas Operator | Sep 2007 |
| 150 | D & L Partnership | Rhome, TX 76078 | Oil Operator | May 1987 |
| 151 | D L Operating | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 152 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Sep 2025 |
| 153 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 154 | Dale, Doyle C. | Poolville, TX 76487 | Oil & Gas Operator | Sep 2018 |
| 155 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 156 | Dallas Royalty, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2012 |
| 157 | Dark Horse Operating Co., L.L.C. | Denton, TX 76202 | Oil & Gas Operator | Oct 2022 |
| 158 | Dawson Geophysical Company | Midland, TX 79701 | Oil Operator | Aug 2024 |
| 159 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 160 | Delfin Operating, LLC | Dallas, TX 75243 | Oil & Gas Operator | Sep 2025 |
| 161 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 162 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Sep 2025 |
| 163 | Denbury Resources Inc. | Plano, TX 75024 | Oil & Gas Operator | Dec 2003 |
| 164 | Denton Oil & Gas | Argyle, TX 76226 | Oil Operator | Dec 2014 |
| 165 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 166 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 167 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2015 |
| 168 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Sep 2025 |
| 169 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Sep 2025 |
| 170 | Dimock Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Sep 2025 |
| 171 | Dimock Petroleum | Dallas, TX 75205 | Oil Operator | Apr 2014 |
| 172 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Sep 2025 |
| 173 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 174 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2025 |
| 175 | Dte Gas Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2014 |
| 176 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Jun 2025 |
| 177 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 178 | DWP Oil & Gas | Wichita Falls, TX 76309 | Oil & Gas Operator | Sep 2025 |
| 179 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Sep 2025 |
| 180 | E-L Gas Co., LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2001 |
| 181 | E.C. Hindman Oil And Gas | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 182 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 183 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Sep 2025 |
| 184 | Ebs Oil & Gas Partners Op.Co.,LP | Dallas, TX 75219 | Oil & Gas Operator | May 2006 |
| 185 | Ec Stryker Inc | Decatur, TX 76234 | Oil & Gas Operator | Dec 2015 |
| 186 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 187 | Edco Energy, Inc. | Austin, TX 78738 | Oil & Gas Operator | May 2003 |
| 188 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 189 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 190 | Efficiency Operating Service | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2025 |
| 191 | El Ran, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Sep 2025 |
| 192 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Sep 2025 |
| 193 | Emerald Petroleum Corporation | Dallas, TX 75244 | Oil & Gas Operator | Apr 2002 |
| 194 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 195 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 196 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 197 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 198 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Sep 2025 |
| 199 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 200 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |