| 101 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 102 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 103 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Dec 2025 |
| 104 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 105 | Cook William Glenn | Wewoka, OK 74884-0727 | Oil & Gas Operator | Nov 2000 |
| 106 | Cooke County Production Company | Shawnee, OK 74801-1800 | Oil & Gas Operator | Jan 2022 |
| 107 | Cooper Energy Corp | | Oil & Gas Operator | Jun 1995 |
| 108 | Cooper Lisa L | Cushing, OK 74023 | Oil & Gas Operator | Mar 2015 |
| 109 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2025 |
| 110 | Cornelius Oil Inc | Kellyville, OK 74039 | Oil & Gas Operator | Oct 2025 |
| 111 | Cornelius Phillip J & Connie | Kellyville, OK 74039 | Oil & Gas Operator | Dec 2000 |
| 112 | Cornelius Tony | Sapulpa, OK 74066-5845 | Oil & Gas Operator | Sep 2025 |
| 113 | Covenant Oil Corp | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2013 |
| 114 | Crain & Deisenroth | Tulsa, OK 74103-4433 | Oil & Gas Operator | Mar 2015 |
| 115 | Crain & Deisenroth LLC | Tulsa, OK 74104-6511 | Oil & Gas Operator | Apr 2014 |
| 116 | Crow Creek Operating Co III LLC | Tulsa, OK 74137-8432 | Oil & Gas Operator | Apr 2015 |
| 117 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Oct 2025 |
| 118 | Crusher Oil Company | Ponca City, OK 74604-5612 | Oil Operator | Apr 2017 |
| 119 | Cruzen Drilling Company Inc | Cleveland, OK 74020-0470 | Oil Operator | Nov 2014 |
| 120 | Culp & Copple Oil Company | Cushing, OK 74023 | Oil & Gas Operator | Aug 2025 |
| 121 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Nov 2025 |
| 122 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | Nov 2025 |
| 123 | Darnell Bobby J | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Nov 2025 |
| 124 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Oct 2025 |
| 125 | Dawes, Tom E | | Oil Operator | Oct 2000 |
| 126 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 127 | Dell Charles E | Cleveland, OK 74020-0090 | Oil & Gas Operator | Feb 2015 |
| 128 | Delong Oil & Gas Services, Inc. | Cushing, OK 74023 | Oil & Gas Operator | Oct 2025 |
| 129 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 130 | Dexxon Inc | Kiefer, OK 74041 | Oil & Gas Operator | Oct 2025 |
| 131 | Don'S Oil Company Inc | Oxford, KS 67119-0006 | Oil Operator | Apr 2011 |
| 132 | Double C Oil & Gas LLC | Jenks, OK 74037-6946 | Oil Operator | Oct 2025 |
| 133 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Dec 2025 |
| 134 | Double J Oil Co LLC | Bristow, OK 74010 | Oil & Gas Operator | Nov 2025 |
| 135 | Double R Petroleum | | Oil & Gas Operator | Sep 2004 |
| 136 | Drumright Well Service Inc | Oilton, OK 74052 | Oil & Gas Operator | Nov 2025 |
| 137 | Dublin Petroleum Corporation | Enid, OK 73702-6029 | Oil & Gas Operator | Nov 2025 |
| 138 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 139 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 140 | Dunlap Drilling And Producing, Inc | Glenpool, OK 74033-4206 | Oil & Gas Operator | Oct 2025 |
| 141 | Duroc Exploration LLC | Bixby, OK 74008 | Oil & Gas Operator | Oct 2025 |
| 142 | Eagle Operating Company | Tulsa, OK 74146-5730 | Oil & Gas Operator | Aug 2020 |
| 143 | Eagle Road Oil LLC | Tulsa, OK 74103-3312 | Oil & Gas Operator | Nov 2025 |
| 144 | Earl-Le Oil Company | Bristow, OK 74010-9547 | Oil & Gas Operator | Oct 2025 |
| 145 | Ecc Energy Corporation | Dewey, OK 74029 | Oil & Gas Operator | Feb 2020 |
| 146 | Edge Oil Company Inc | Cleveland, OK 74020-0284 | Oil & Gas Operator | Feb 2024 |
| 147 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 148 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Oct 2025 |
| 149 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Nov 2025 |
| 150 | Elk Oil Company | Overland Park, KS 66212 | Oil & Gas Operator | Sep 2007 |
| 151 | Energy Lease Service Inc | Drumright, OK 74030-7403 | Oil & Gas Operator | Oct 2025 |
| 152 | Enersearch Inc | Sand Springs, OK 74063 | Oil & Gas Operator | Dec 2013 |
| 153 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 154 | Enterprise Energy Exploration Inc | Tulsa, OK 74133-6724 | Oil & Gas Operator | Oct 2025 |
| 155 | Equity Drilling Company Inc | Dewey, OK 74029 | Oil & Gas Operator | Nov 1998 |
| 156 | Ernst Petroleum Company Inc | Arlington, VA 22201 | Oil & Gas Operator | Aug 2013 |
| 157 | Exoko Operating Company Inc | Tulsa, OK 74170-0246 | Oil & Gas Operator | Jan 2006 |
| 158 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Oct 2025 |
| 159 | Eyler Corporation | | Oil & Gas Operator | Nov 2012 |
| 160 | Eyler Dean E | Cleveland, OK 74020 | Oil & Gas Operator | Oct 2025 |
| 161 | Fairchild Well Service Inc | Ponca City, OK 74602-0470 | Oil & Gas Operator | Jun 2006 |
| 162 | Fairview Production Co LLC | Davis, OK 73030 | Oil & Gas Operator | Oct 2025 |
| 163 | Fallen Timbers Energy LLC | Tulsa, OK 74105-8713 | Oil Operator | Feb 2021 |
| 164 | Federal Energy Development Co. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2011 |
| 165 | Ferraro Energy Corporation | Oklahoma City, OK 73114-6629 | Oil & Gas Operator | Aug 2013 |
| 166 | FGS Energy LLC | Duncan, OK 73533-1829 | Oil & Gas Operator | Nov 2025 |
| 167 | Flatt Energy Inc | | Oil & Gas Operator | Sep 2019 |
| 168 | Forest 1 Development Company | Denver, CO 80202-4966 | Oil & Gas Operator | Mar 2008 |
| 169 | Freedom Operating Company LLC | Tulsa, OK 74136-6834 | Oil & Gas Operator | Nov 2025 |
| 170 | G & C Petroleum Inc | Yale, OK 74085-2502 | Oil & Gas Operator | Oct 2025 |
| 171 | G M C Oil & Gas LTD | Oklahoma City, OK 73102-8804 | Oil & Gas Operator | Sep 1999 |
| 172 | Gaskins Glendell L | Slick, OK 74071 | Oil & Gas Operator | Oct 2025 |
| 173 | General Oil Company, Inc. | Wichita, KS 67213 | Oil & Gas Operator | Dec 2025 |
| 174 | Genie Oil & Gas Corporation | Broken Arrow, OK 74013-3783 | Oil & Gas Operator | Oct 2025 |
| 175 | GLB Exploration Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2025 |
| 176 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Oct 2025 |
| 177 | Gomaco Operating Company | Tulsa, OK 74115 | Oil & Gas Operator | Nov 2025 |
| 178 | Graves J M | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2007 |
| 179 | Graves John G Oil Prop Inc | Tulsa, OK 74116-5666 | Oil & Gas Operator | Feb 2001 |
| 180 | Gray Fox Operating Company | Tulsa, OK 74119 | Oil Operator | May 1993 |
| 181 | Grayhorse Operating Inc | Tulsa, OK 74103-4438 | Oil & Gas Operator | Oct 2025 |
| 182 | Great Plains Petroleum, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Sep 2025 |
| 183 | Greg Hall Oil & Gas LLC | Norman, OK 73072 | Oil & Gas Operator | Oct 2025 |
| 184 | Griffin Well Service Inc | Konawa, OK 74849-9710 | Oil & Gas Operator | Oct 2025 |
| 185 | Ground Development Company Inc | Dallas, TX 75229-0377 | Oil & Gas Operator | Jan 2013 |
| 186 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | Nov 2025 |
| 187 | Guinn David E | Cleveland, OK 74020 | Oil & Gas Operator | Oct 2025 |
| 188 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 189 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 190 | Hallmark Resources, Inc | Stilwell, OK 74960-0312 | Oil & Gas Operator | Sep 2020 |
| 191 | Hanoco Inc | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2025 |
| 192 | Hanover Operating Company | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1998 |
| 193 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 194 | Harrington SR Tommy W | Drumright, OK 74030-5778 | Oil Operator | May 2015 |
| 195 | Harter Energy Inc | Tulsa, OK 74105 | Oil & Gas Operator | Oct 2025 |
| 196 | Hazen Oil Company | Cleveland, OK 74020-9633 | Oil Operator | Jul 2020 |
| 197 | Helton Oil Company | Edmond, OK 73083-7283 | Oil & Gas Operator | Aug 2016 |
| 198 | Herrman & Ikenberry | Cushing, OK 74023-0247 | Oil & Gas Operator | Dec 2003 |
| 199 | High Energy | Cushing, OK 74023 | Oil & Gas Operator | Sep 2025 |
| 200 | Highmount Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2014 |