| 101 | C E L Inc | Bartlesville, OK 74006 | Oil & Gas Operator | Jan 2020 |
| 102 | Cactus Oil & Gas LLC | Seminole, OK 74868-2430 | Oil & Gas Operator | Mar 2018 |
| 103 | Callie Oil Company LLC | Perry, OK 73077 | Oil & Gas Operator | Aug 2025 |
| 104 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 105 | Campbell Don G | Konawa, OK 74849 | Oil Operator | Feb 1997 |
| 106 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | Dec 2025 |
| 107 | Cantrell Energy Corporation | Ada, OK 74820-0835 | Oil & Gas Operator | Sep 2025 |
| 108 | Cantrell Robert R | Ada, OK 74820 | Oil & Gas Operator | Aug 2025 |
| 109 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Sep 2025 |
| 110 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Aug 2025 |
| 111 | Capmac Inc | Tulsa, OK 74105-7119 | Oil & Gas Operator | Jan 2007 |
| 112 | Carbon Ridge Energy LLC | Norman, OK 73069 | Oil & Gas Operator | Sep 2025 |
| 113 | Carmac Energy Corporation | Dallas, TX 75219-2311 | Oil & Gas Operator | Aug 2025 |
| 114 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 115 | Carney Mark C & Karen M | Dallas, TX 75206-4010 | Oil & Gas Operator | Oct 1994 |
| 116 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 117 | CBL Resources LLC | Tulsa, OK 74136-6308 | Oil & Gas Operator | Sep 2025 |
| 118 | CDS Oil Company | Tulsa, OK 74147-1514 | Oil & Gas Operator | Mar 2015 |
| 119 | Cenpat Operating LLC | Houston, TX 77042-3044 | Oil & Gas Operator | Aug 2025 |
| 120 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2025 |
| 121 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 122 | Chapman Elise P Estate | | Oil & Gas Operator | Mar 2020 |
| 123 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2025 |
| 124 | Cherokee Royalties & Minerals Inc | Duncan, OK 73533 | Oil & Gas Operator | Jul 2025 |
| 125 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 126 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 127 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Aug 2025 |
| 128 | Circle 9 Resources LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Sep 2025 |
| 129 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Aug 2025 |
| 130 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Dec 2025 |
| 131 | Claremont Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Feb 2017 |
| 132 | Claremont Exploration Inc | Tulsa, OK 74103-4107 | Oil & Gas Operator | Jun 1997 |
| 133 | Claybrook Drilling Co Inc | | Oil & Gas Operator | Sep 2014 |
| 134 | Claybrook Production Co. Inc. | Wewoka, OK 74884-1380 | Oil & Gas Operator | Jun 2014 |
| 135 | Cleary Exploration LLC | Oklahoma City, OK 73112-7221 | Oil & Gas Operator | Oct 2014 |
| 136 | Cleary Jo Anne | Saint Louis, OK 74866 | Oil Operator | Jun 2025 |
| 137 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 138 | Clifton & Associates Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2020 |
| 139 | CLV Oil & Gas Inc | Tulsa, OK 74169-0713 | Oil & Gas Operator | Apr 2020 |
| 140 | CM Oil Co. | FT Stockton, TX 79735 | Oil & Gas Operator | Dec 2025 |
| 141 | CMS Energy Inc | Dallas, TX 75287 | Oil & Gas Operator | Aug 2025 |
| 142 | Columbus Oil Company | Seminole, OK 74868 | Oil & Gas Operator | Sep 2025 |
| 143 | Comanche Petroleum Corporation | Oklahoma City, OK 73179 | Oil & Gas Operator | Apr 2024 |
| 144 | Compass Drilling Inc | Enid, OK 73702-5467 | Oil & Gas Operator | Sep 2014 |
| 145 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 146 | Conner Jelly | Seminole, OK 74868 | Oil & Gas Operator | Mar 1996 |
| 147 | Conner Production Co LLC | Seminole, OK 74868 | Oil & Gas Operator | Aug 2025 |
| 148 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 149 | Consolidated Production Inc. | Seminole, OK 74868 | Oil & Gas Operator | Aug 2025 |
| 150 | Consolidated Properties | Tulsa, OK 74129 | Oil & Gas Operator | Jan 2017 |
| 151 | Consolidated Resources Corp | Shawnee, OK 74801 | Oil & Gas Operator | Sep 2014 |
| 152 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Dec 2025 |
| 153 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 154 | Cooper John T | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 155 | Cooper Oil Inc | Duncan, OK 73534 | Oil & Gas Operator | Sep 2014 |
| 156 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Aug 2025 |
| 157 | Cousins Exploration Co | Wichita Falls, TX 76307 | Oil Operator | Jun 1991 |
| 158 | Crescent Exploration, LLC | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 159 | Crown Consulting Inc | Liberal, KS 67905 | Oil & Gas Operator | Jun 2025 |
| 160 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Aug 2025 |
| 161 | Cuesta Petroleum Inc | Shawnee, OK 74801-6963 | Oil & Gas Operator | Aug 2025 |
| 162 | Culbreath Oil & Gas Co Inc | Tulsa, OK 74135 | Oil & Gas Operator | Sep 2025 |
| 163 | CVR Supply & Trading, LLC | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2024 |
| 164 | D & B Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2003 |
| 165 | D & D Energy Inc | Sapulpa, OK 74066-8734 | Oil & Gas Operator | May 2013 |
| 166 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 167 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 168 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Dec 2025 |
| 169 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Dec 2025 |
| 170 | Dalcor Energy LLC | Duncan, OK 73534 | Oil & Gas Operator | Aug 2025 |
| 171 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 172 | Darrell'S Drilling Inc | Konawa, OK 74849 | Oil Operator | Aug 2025 |
| 173 | Darriel C Ray | | Oil Operator | Jun 2020 |
| 174 | Dash Operating LLC | Oklahoma City, OK 73118-5031 | Oil & Gas Operator | Jul 2025 |
| 175 | David Ridley Oil LLC | Tecumseh, OK 74873 | Oil Operator | Aug 2025 |
| 176 | Davis & Hamilton Oil Company | Edmond, OK 73083-3670 | Oil Operator | Aug 2022 |
| 177 | Davis Henry | Tulsa, OK 74135-3567 | Oil & Gas Operator | Dec 1994 |
| 178 | Davon Drilling Company | Oklahoma City, OK 73113-0665 | Oil & Gas Operator | Mar 2015 |
| 179 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Sep 2025 |
| 180 | Dead Fern Resources Inc | Sperry, OK 74073 | Oil & Gas Operator | Sep 2025 |
| 181 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 182 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 183 | Dee-Jay Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 184 | Delphi Oil And Gas LLC | Macomb, OK 74852 | Oil Operator | May 2025 |
| 185 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 186 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 187 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 188 | Dewey Enterprises Inc | | Oil & Gas Operator | Aug 2025 |
| 189 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 190 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Dec 2025 |
| 191 | Dobbins Family Residual Trust | Ardmore, OK 73401 | Oil Operator | Jul 2008 |
| 192 | Doco Development Corporation | Norman, OK 73072 | Oil & Gas Operator | Sep 2025 |
| 193 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 194 | DRG Energy Inc. | Norman, OK 73026-3171 | Oil & Gas Operator | Aug 2025 |
| 195 | Duck Bros Dozer & Trucking Inc | Konawa, OK 74849 | Oil & Gas Operator | Aug 2025 |
| 196 | Duncan Oil & Gas Inc | Norman, OK 73072 | Oil & Gas Operator | Sep 2020 |
| 197 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 198 | Dyno Energy LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Sep 2025 |
| 199 | Eagle Road Oil LLC | Tulsa, OK 74103-3312 | Oil & Gas Operator | Aug 2025 |
| 200 | Earl Oil Inc | Stillwater, OK 74074-1079 | Oil & Gas Operator | Aug 2025 |