| 101 | Conner Jelly | Seminole, OK 74868 | Oil & Gas Operator | Mar 1996 |
| 102 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 103 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 104 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Apr 2025 |
| 105 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Nov 2024 |
| 106 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 107 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2025 |
| 108 | Cook Robert L | Rockwall, TX 75087-0892 | Oil & Gas Operator | Mar 2015 |
| 109 | Coronado Petroleum Corporation | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Jan 2025 |
| 110 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 111 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 112 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 113 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 114 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 115 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Apr 2025 |
| 116 | Courson, Harold D. | Perryton, TX 79070 | Oil & Gas Operator | Aug 1998 |
| 117 | Covington Oil Company Inc | Nichols Hills, OK 73116 | Oil & Gas Operator | Feb 2025 |
| 118 | Cox Edwin L & R Berry | Dallas, TX 75202 | Oil & Gas Operator | Apr 2015 |
| 119 | Cox Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 120 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 121 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Jan 2025 |
| 122 | Crescent Exploration, LLC | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 123 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 124 | Cross Timbers Oil Company | Dallas, TX 75284 | Oil & Gas Operator | May 2013 |
| 125 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 126 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 127 | Crouch Petroleum Company | Amarillo, TX 79110 | Oil & Gas Operator | Mar 2015 |
| 128 | Csoda Operating Company LLC | Amarillo, TX 79114-7506 | Oil & Gas Operator | Aug 2021 |
| 129 | D & S Operating | Texhoma, OK 73949 | Oil & Gas Operator | May 2001 |
| 130 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2025 |
| 131 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 132 | Darrah Oil Company LLC | Wichita, KS 67201 | Oil & Gas Operator | Apr 2025 |
| 133 | Dart Oil Properties | Enid, OK 73703 | Oil & Gas Operator | Oct 1992 |
| 134 | Davis & Davis | | Oil & Gas Operator | Dec 2021 |
| 135 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 136 | Dawson Resources Inc | Franktown, CO 80116 | Oil & Gas Operator | Mar 2015 |
| 137 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jan 2025 |
| 138 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Jan 2025 |
| 139 | Deaton, Gary L. Corporation | Oklahoma City, OK 73105 | Oil & Gas Operator | Mar 2015 |
| 140 | Decalta International Corp | Denver, CO 80202 | Oil & Gas Operator | Mar 2015 |
| 141 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 142 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 143 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 144 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 145 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Jan 2025 |
| 146 | Domar Oil & Gas, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Oct 2000 |
| 147 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 148 | Donson Corporation | Edmond, OK 73083-0341 | Oil & Gas Operator | Jul 1997 |
| 149 | Dorchester Hugoton LTD | Garland, TX 75042-8212 | Oil & Gas Operator | Mar 2004 |
| 150 | Dorchester Minerals Operating LP | Dallas, TX 75219 | Oil & Gas Operator | Jun 2022 |
| 151 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | Feb 2025 |
| 152 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 153 | Dunne Equities Operating, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 154 | Dunne Equities, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2014 |
| 155 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 156 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2025 |
| 157 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 158 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Jan 2025 |
| 159 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 160 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Feb 2025 |
| 161 | Elder & Vaughn Inc | Oklahoma City, OK 73154-0938 | Oil & Gas Operator | Mar 2008 |
| 162 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Feb 2025 |
| 163 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Feb 2025 |
| 164 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Feb 2024 |
| 165 | Encino Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 166 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Feb 2025 |
| 167 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 168 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 169 | Enogex Services Corporation | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Apr 2009 |
| 170 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |
| 171 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 172 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 173 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 174 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Jan 2025 |
| 175 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 176 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Apr 2025 |
| 177 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 178 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Dec 2024 |
| 179 | Fairview Production Co LLC | Davis, OK 73030 | Oil & Gas Operator | Feb 2025 |
| 180 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Feb 2025 |
| 181 | First National Oil, Inc. | Edmond, OK 73003 | Oil & Gas Operator | Jan 2025 |
| 182 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 183 | Foreman Joy | Guymon, OK 73942-3159 | Oil & Gas Operator | Jan 2003 |
| 184 | Fortay Inc. | Sunray, TX 79086 | Oil & Gas Operator | Apr 2025 |
| 185 | Fossil Creek Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Apr 2025 |
| 186 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Apr 2025 |
| 187 | Four Star Oil & Gas Company | Houston, TX 77252 | Oil & Gas Operator | Nov 2024 |
| 188 | Fox Jr Jimmy D | Bartlesville, OK 74003 | Oil & Gas Operator | Nov 2005 |
| 189 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 190 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 191 | Frisco Energy, L.L.C. | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2025 |
| 192 | Frontier Operating Corporation | Albany, TX 76430 | Oil & Gas Operator | Apr 2025 |
| 193 | FX Energy Operating, LLC | Canadian, TX 79014 | Oil & Gas Operator | Apr 2025 |
| 194 | G & C Petroleum Inc | Yale, OK 74085-2502 | Oil & Gas Operator | Feb 2025 |
| 195 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 196 | Genesis Inc | Seminole, OK 74818-1647 | Oil & Gas Operator | Sep 2014 |
| 197 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 198 | Geodyne Resources Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 199 | Geoex Resources Inc | | Oil & Gas Operator | Jan 1997 |
| 200 | GMX Resources, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2014 |