| 101 | Centurion Operating Corporation | Rockwall, TX 75087 | Oil & Gas Operator | May 2025 |
| 102 | Chalmers Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Apr 1997 |
| 103 | Chancellor, Earl Sales Co., Inc. | Sweetwater, TX 79556 | Oil & Gas Operator | May 2025 |
| 104 | Chandler Oil & Gas, LLC | Beeville, TX 78102 | Oil & Gas Operator | May 2025 |
| 105 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 106 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 107 | Charis Oil & Gas, LLC | Addison, TX 75001 | Oil & Gas Operator | May 2025 |
| 108 | Chase Operating Company | Abilene, TX 79608 | Oil & Gas Operator | Feb 2016 |
| 109 | Cherokee Production Corp. | Greenville, TX 75401 | Oil & Gas Operator | May 2025 |
| 110 | Chiodo Corp. | San Antonio, TX 78232 | Oil & Gas Operator | May 2025 |
| 111 | Chisholm Operating, Inc. | Abilene, TX 79606 | Oil & Gas Operator | May 2025 |
| 112 | Citori Oil Company, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2014 |
| 113 | City Of Brady | Brady, TX 76825 | Gas Operator | Feb 1998 |
| 114 | Clear Fork, Incorporated | Abilene, TX 79604 | Oil & Gas Operator | May 2025 |
| 115 | Coleman & Johnson Oil Company | Brownwood, TX 76801 | Oil & Gas Operator | May 2025 |
| 116 | Coleman County Project | Coleman, TX 76834 | Oil & Gas Operator | Oct 2012 |
| 117 | Comanche Oil And Gas Company | Brownwood, TX 76801 | Oil & Gas Operator | May 2025 |
| 118 | Concho Oilfield Serv & Oper Co. | Eden, TX 76837 | Oil & Gas Operator | May 2025 |
| 119 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 120 | Conquistador Petroleum,Inc. | Coleman, TX 76834 | Oil & Gas Operator | May 2025 |
| 121 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 122 | Continual Oil & Gas, Inc. | Abilene, TX 79602 | Oil & Gas Operator | May 2025 |
| 123 | Contour Oil & Gas, LLC | Abilene, TX 79602 | Oil & Gas Operator | Dec 2015 |
| 124 | Coyote Services, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2002 |
| 125 | Craruth Energy Corporation | Abilene, TX 79602 | Oil & Gas Operator | May 2025 |
| 126 | Creed Operating Co., LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | May 2025 |
| 127 | Creek Energy, Inc. | Brownwood, TX 76804 | Oil & Gas Operator | May 2025 |
| 128 | Cremson Oil & Gas | Coleman, TX 76834 | Oil & Gas Operator | May 2025 |
| 129 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 130 | Crosstex Services, L.L.C. | Tuscola, TX 79562 | Oil Operator | May 2025 |
| 131 | Crude Production Company | Clyde, TX 79510 | Oil & Gas Operator | May 2025 |
| 132 | Crude Resources, Inc. | Carrollton, TX 75011 | Oil & Gas Operator | Mar 2008 |
| 133 | CWC Oil & Gas, LLC | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 134 | Cwic, Inc. | Granbury, TX 76049 | Oil & Gas Operator | May 2025 |
| 135 | CXL Energy LLC | Canada, 00100 | Oil & Gas Operator | May 2025 |
| 136 | D&S Oil And Gas Properties | San Angelo, TX 76902 | Oil & Gas Operator | May 2025 |
| 137 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | May 2025 |
| 138 | D-T Development Company | Richardson, TX 75081 | Oil & Gas Operator | Sep 2002 |
| 139 | D. A. B. Oil Service, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Nov 2012 |
| 140 | D.J. & T. Energy | Abilene, TX 79601 | Oil & Gas Operator | May 2025 |
| 141 | D.N.I. | Bangs, TX 76823 | Oil & Gas Operator | May 2025 |
| 142 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 143 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 144 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 145 | David, Phillip | Lawrenceville, IL 62439 | Oil & Gas Operator | May 2025 |
| 146 | Del Mar Energy, Inc. | Van Alstyne, TX 75495 | Oil & Gas Operator | May 2025 |
| 147 | Delray Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 148 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | May 2025 |
| 149 | Dewco Exploration | Coleman, TX 76834 | Oil & Gas Operator | Nov 2007 |
| 150 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Dec 2016 |
| 151 | Dickson Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2000 |
| 152 | Dino Operating LLC | Throckmorton, TX 76483 | Oil Operator | May 2025 |
| 153 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 154 | Dittman, D. W. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2007 |
| 155 | DJ & T Services, LLC | Abilene, TX 79601 | Oil & Gas Operator | May 2025 |
| 156 | DMV Pipeline LLC | Plano, TX 75074 | Oil & Gas Operator | May 2025 |
| 157 | Doc Oil | Brownwood, TX 76801 | Oil & Gas Operator | Oct 2019 |
| 158 | Domino Operations, Inc. | Abilene, TX 79603 | Oil & Gas Operator | May 2025 |
| 159 | Dominy Oil Co., Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Oct 1999 |
| 160 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | May 2025 |
| 161 | Double M Petroproperties, Inc. | Haskell, TX 79521 | Oil & Gas Operator | May 2025 |
| 162 | Double Play Oil & Gas, Inc | Portland, TX 78374 | Oil & Gas Operator | May 2025 |
| 163 | Driscoll S.W.D. Inc. | San Antonio, TX 78229 | Oil & Gas Operator | May 2025 |
| 164 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 165 | Ducky Oil Corporation | Fort Worth, TX 76120 | Oil & Gas Operator | May 2025 |
| 166 | Durango Operating Co., Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2002 |
| 167 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | May 2025 |
| 168 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 169 | Eagle Capital Partners, LLC | Eunice, NM 88231 | Oil & Gas Operator | May 2025 |
| 170 | Earthbound Resources LLC | Merkel, TX 79536 | Oil & Gas Operator | May 2025 |
| 171 | Eastco Gas Co. | Midland, TX 79707 | Oil & Gas Operator | Oct 1999 |
| 172 | Elco Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | May 2025 |
| 173 | Encon Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 174 | Endurance Resources LLC | Addison, TX 75001 | Oil & Gas Operator | Apr 2017 |
| 175 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 176 | Enrich Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | May 2025 |
| 177 | Eratz Investments Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 178 | Erin Oil Exploration, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 1996 |
| 179 | Estoril Producing Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |
| 180 | Evangeline Trading Company | Ballinger, TX 76821 | Oil & Gas Operator | May 2025 |
| 181 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Feb 2025 |
| 182 | Exp, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2003 |
| 183 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 184 | Family Trust B, The | San Angelo, TX 76904 | Oil & Gas Operator | May 2019 |
| 185 | Fargo Exploration Co. | Abilene, TX 79601 | Oil & Gas Operator | Dec 1995 |
| 186 | Farrington, Walter L., Jr. | Tyler, TX 75701 | Oil & Gas Operator | Feb 2002 |
| 187 | Federal Energy Development Co. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2011 |
| 188 | Ffa Petroleum Services | Victoria, TX 77903 | Oil & Gas Operator | Sep 2001 |
| 189 | Ffa Petroleum Services, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2018 |
| 190 | Fiscus Drilling Co., Inc. | Clyde, TX 79510 | Oil & Gas Operator | Apr 2015 |
| 191 | Flint Rock Resources MGMNT, Inc. | Austin, TX 78734 | Oil & Gas Operator | May 2025 |
| 192 | Flynn, Ben A. Trustee | Coleman, TX 76834 | Oil & Gas Operator | Jul 2001 |
| 193 | Fortuna Exploration, Inc. | Abilene, TX 79602 | Oil & Gas Operator | May 2025 |
| 194 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | May 2025 |
| 195 | Four C Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2024 |
| 196 | Fourcooks Oil & Gas, LLC | Waco, TX 76710 | Oil Operator | May 2025 |
| 197 | Fultz Oil Company | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 1995 |
| 198 | Furry Oil & Gas, Inc. | Bangs, TX 76823 | Oil & Gas Operator | May 2025 |
| 199 | Furry Operating Account | Brownwood, TX 76804 | Oil & Gas Operator | Aug 2003 |
| 200 | Furry Producing Company | Brownwood, TX 76801 | Oil & Gas Operator | May 2025 |