| 101 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Mar 2025 |
| 102 | Cassidy Jr John | Stroud, OK 74079-0200 | Oil & Gas Operator | Nov 2014 |
| 103 | Castelli Exploration, Inc. | Oklahoma City, OK 73162 | Oil & Gas Operator | Feb 2025 |
| 104 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | May 2025 |
| 105 | Cenpat Operating LLC | Houston, TX 77042-3044 | Oil & Gas Operator | Feb 2025 |
| 106 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2025 |
| 107 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 108 | Chapman Jim | Bristow, OK 74010-1173 | Oil Operator | Apr 2021 |
| 109 | Cher Oil Company LTD | Ripley, OK 74062 | Oil & Gas Operator | Mar 2025 |
| 110 | Cherokee Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 111 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 112 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 113 | Circle 9 Resources LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Feb 2025 |
| 114 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 115 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 116 | Claborn Julia | Okmulgee, OK 74447-9781 | Oil & Gas Operator | Mar 2022 |
| 117 | Claremont Exploration Inc | Tulsa, OK 74103-4107 | Oil & Gas Operator | Jun 1997 |
| 118 | Clark Operating Services, Inc. | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 119 | Clear Creek Royalty LLC | Tulsa, OK 74137 | Oil & Gas Operator | Jul 2023 |
| 120 | Cleary Exploration LLC | Oklahoma City, OK 73112-7221 | Oil & Gas Operator | Oct 2014 |
| 121 | Clifton & Associates Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2020 |
| 122 | CLV Oil & Gas Inc | Tulsa, OK 74169-0713 | Oil & Gas Operator | Apr 2020 |
| 123 | CM Exploration Company Inc. | | Oil & Gas Operator | Apr 2009 |
| 124 | CMT Oil & Gas Company Inc | Tulsa, OK 74133-6724 | Oil & Gas Operator | Feb 2025 |
| 125 | CMT Operating LLC | Cleveland, OK 74020-0113 | Oil & Gas Operator | Mar 2015 |
| 126 | Columbia Production Company | Edmond, OK 73083 | Oil & Gas Operator | May 2020 |
| 127 | Confederate Bay LLC | Okemah, OK 74859 | Oil & Gas Operator | Jan 2025 |
| 128 | Confederate Spooling Inc | Okemah, OK 74859-2409 | Oil & Gas Operator | Apr 2020 |
| 129 | Conner Production Co LLC | Seminole, OK 74868 | Oil & Gas Operator | Feb 2025 |
| 130 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 131 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 132 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 133 | Cooper Lisa L | Cushing, OK 74023 | Oil & Gas Operator | Mar 2015 |
| 134 | Cornelius Tony | Sapulpa, OK 74066-5845 | Oil & Gas Operator | Dec 2024 |
| 135 | Cross Timbers Oil Company | Dallas, TX 75284 | Oil & Gas Operator | May 2013 |
| 136 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Feb 2025 |
| 137 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 138 | Culbreath Oil & Gas Company, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Feb 2025 |
| 139 | Cumberland Operating Company | Seminole, OK 74868-1258 | Oil & Gas Operator | Mar 2007 |
| 140 | CW Investments | Okmulgee, OK 74447-4026 | Oil & Gas Operator | Feb 2025 |
| 141 | Cyanostar Energy, Inc | Tulsa, OK 74103-4122 | Oil & Gas Operator | Sep 2001 |
| 142 | Cypress Exploration Company | Tulsa, OK 74132 | Oil & Gas Operator | Feb 2025 |
| 143 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 144 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | May 2025 |
| 145 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 146 | Darrah Oil Company LLC | Wichita, KS 67201 | Oil & Gas Operator | May 2025 |
| 147 | Darrell'S Drilling Inc | Konawa, OK 74849 | Oil Operator | Feb 2025 |
| 148 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2025 |
| 149 | David Ridley Oil LLC | Tecumseh, OK 74873 | Oil Operator | Feb 2025 |
| 150 | Davis Henry | Tulsa, OK 74135-3567 | Oil & Gas Operator | Dec 1994 |
| 151 | Davis Jim L | Morris, OK 74445 | Oil & Gas Operator | Dec 2021 |
| 152 | Davis Kendall | Bethany, OK 73008-4714 | Oil Operator | Aug 2016 |
| 153 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | May 2025 |
| 154 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 155 | Dead Fern Resources Inc | Sperry, OK 74073 | Oil & Gas Operator | Mar 2025 |
| 156 | Deck Exploration Inc | Perry, OK 73077-0303 | Oil & Gas Operator | May 2013 |
| 157 | Degge Oil Field Service | Okemah, OK 74859-0269 | Oil Operator | Nov 2014 |
| 158 | Degge Oilfield Services LLC | Okemah, OK 74859 | Oil Operator | Jan 2025 |
| 159 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Feb 2025 |
| 160 | Dempsey, Wayne L | | Oil & Gas Operator | Mar 2011 |
| 161 | Dennis & Davis Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | May 2025 |
| 162 | Derae Oil Company | Seminole, OK 74868-2617 | Oil & Gas Operator | Feb 1997 |
| 163 | Derrick Resources Inc. | Henryetta, OK 74437-4249 | Oil & Gas Operator | Feb 2025 |
| 164 | Deshields Oil & Gas Inc | Okemah, OK 74859-9612 | Oil & Gas Operator | Sep 2014 |
| 165 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 166 | Devon Resources Corporation | Jenks, OK 74037-3525 | Oil & Gas Operator | Feb 2025 |
| 167 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 168 | Diamond Harry H Inc | Shawnee, OK 74801 | Oil & Gas Operator | Feb 2025 |
| 169 | Digger Oil & Gas Inc | Prague, OK 74864 | Oil & Gas Operator | Mar 2025 |
| 170 | Discovery Energy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2025 |
| 171 | Dobson Oil Operators Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2004 |
| 172 | Don'S Oil Company Inc | Oxford, KS 67119-0006 | Oil Operator | Apr 2011 |
| 173 | Donray Petroleum LLC | Choctaw, OK 73020 | Oil & Gas Operator | Feb 2025 |
| 174 | Donson Corporation | Edmond, OK 73083-0341 | Oil & Gas Operator | Jul 1997 |
| 175 | Douglass Dietz & Daley Inc | Oklahoma City, OK 73154-0125 | Oil & Gas Operator | Aug 2023 |
| 176 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 177 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | Mar 2025 |
| 178 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 179 | Drumright Well Service Inc | Oilton, OK 74052 | Oil & Gas Operator | Jan 2025 |
| 180 | Dual Operating & Production Co | Tulsa, OK 74145-7831 | Oil & Gas Operator | Apr 2020 |
| 181 | Duco Energy LLC | Tulsa, OK 74145-4514 | Oil & Gas Operator | Mar 2015 |
| 182 | Duncan Ronald R | Okemah, OK 74859-9603 | Oil & Gas Operator | Aug 2023 |
| 183 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 184 | Dunne Equities, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2014 |
| 185 | DW Oil & Gas LLC | Okmulgee, OK 74447 | Oil & Gas Operator | Feb 2025 |
| 186 | Dyne Exploration Company | Plano, TX 75093-6512 | Oil & Gas Operator | Apr 2020 |
| 187 | Dyno Energy LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2025 |
| 188 | Eagle Minerals & Oil Prop Inc | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2002 |
| 189 | Eagle Minerals Inc | Tulsa, OK 74119 | Oil Operator | Jun 1998 |
| 190 | Eagle Resources Inc | Claremore, OK 74019-5398 | Oil & Gas Operator | May 2013 |
| 191 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Feb 2025 |
| 192 | Earnest Russel | Okmulgee, OK 74447-1216 | Oil & Gas Operator | Jan 2007 |
| 193 | Edge Oil Company Inc | Cleveland, OK 74020-0284 | Oil & Gas Operator | Feb 2024 |
| 194 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 195 | Eec Inc | Norman, OK 73069-6344 | Oil & Gas Operator | Mar 2025 |
| 196 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | Feb 2025 |
| 197 | Ekg Operating Inc | Seminole, OK 74818-1028 | Oil & Gas Operator | Nov 2015 |
| 198 | El Paso Natural Gas Company | El Paso, TX 79978 | Oil & Gas Operator | Apr 2013 |
| 199 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 200 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |