| 101 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Sep 2025 |
| 102 | Butler Petroleum LLC | Van Alstyne, TX 75495 | Oil Operator | May 2020 |
| 103 | C & C Tank Truck Service Inc | Holdenville, OK 74848 | Oil Operator | Feb 2012 |
| 104 | C & W Oil Inc | | Oil & Gas Operator | Aug 2016 |
| 105 | C & W Operating LLC | Tulsa, OK 74145-7627 | Oil Operator | May 2020 |
| 106 | C B Energy Resources | Bartlesville, OK 74006 | Oil & Gas Operator | Mar 2015 |
| 107 | C Bar K Enterprises Inc | Oklahoma City, OK 73154-1828 | Oil & Gas Operator | Dec 2022 |
| 108 | C E D LC | Enid, OK 73702-0326 | Oil & Gas Operator | Oct 2021 |
| 109 | Cactus Oil & Gas LLC | Seminole, OK 74868-2430 | Oil & Gas Operator | Mar 2018 |
| 110 | Calyx Energy III LLC | Tulsa, OK 74136-4226 | Oil & Gas Operator | Jun 2025 |
| 111 | Canaan Resources LLC | Oklahoma City, OK 73118-1126 | Gas Operator | Oct 2023 |
| 112 | Canaan Resources X LLC | Oklahoma City, OK 73103-4925 | Oil & Gas Operator | Sep 2024 |
| 113 | Cantrell Energy Corporation | Ada, OK 74820-0835 | Oil & Gas Operator | Jun 2025 |
| 114 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | Jul 2025 |
| 115 | Canyon Creek Energy Operating LLC | Tulsa, OK 74120 | Oil & Gas Operator | Jun 2025 |
| 116 | Cap Oil Company | Ada, OK 74820 | Oil Operator | Apr 2025 |
| 117 | Capataz Operating Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2020 |
| 118 | Cardinal Oil LLC | Drumright, OK 74030 | Oil & Gas Operator | Apr 2025 |
| 119 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 120 | Carlton, Richard L | | Oil & Gas Operator | Aug 1999 |
| 121 | Carmac Energy Corporation | Dallas, TX 75219-2311 | Oil & Gas Operator | Jun 2025 |
| 122 | Carmichael Oil & Gas Company | Vallejo, CA 94591-5653 | Oil & Gas Operator | Apr 2014 |
| 123 | Cartledge & Cartledge Oil Company Inc | Kiefer, OK 74041 | Oil & Gas Operator | Jun 2025 |
| 124 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 125 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Jul 2025 |
| 126 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | Sep 2025 |
| 127 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2025 |
| 128 | CH4 Production Company Inc | Tulsa, OK 74170-1955 | Gas Operator | May 2007 |
| 129 | Chapman Exploration Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2013 |
| 130 | Charro Operating, L.L.C. | Englewood, CO 80112 | Oil & Gas Operator | Sep 2025 |
| 131 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Sep 2025 |
| 132 | Chastain Diane | Coffeyville, KS 67337-9620 | Oil & Gas Operator | Feb 2015 |
| 133 | Chastain Land & Energy LLC | Wetumka, OK 74883-0067 | Oil & Gas Operator | Sep 2017 |
| 134 | Chermac Energy Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2020 |
| 135 | Cherokee Royalties & Minerals Inc | Duncan, OK 73533 | Oil & Gas Operator | May 2025 |
| 136 | Cherry, William H., Inc. | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2015 |
| 137 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 138 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 139 | Chiles Jack Well Service | Atwood, OK 74827-0373 | Oil Operator | Apr 2014 |
| 140 | Chiles Robert Morris | Allen, OK 74825 | Oil Operator | Jun 2025 |
| 141 | Chisholm Oil And Gas Operating LLC | Tulsa, OK 74103-3522 | Oil & Gas Operator | Jul 2025 |
| 142 | Cimarron Oil & Gas Inc | Perry, OK 73077-1318 | Oil & Gas Operator | Sep 2000 |
| 143 | Cimarron Production Co Inc | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Jun 2025 |
| 144 | Circle C Oilfield Supply Inc | Wetumka, OK 74883-0068 | Oil & Gas Operator | Apr 2017 |
| 145 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Sep 2025 |
| 146 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 147 | Claybrook Production Co. Inc. | Wewoka, OK 74884-1380 | Oil & Gas Operator | Jun 2014 |
| 148 | Cleary Exploration LLC | Oklahoma City, OK 73112-7221 | Oil & Gas Operator | Oct 2014 |
| 149 | Clinton Public Works Authority | Clinton, OK 73601 | Oil & Gas Operator | May 2023 |
| 150 | CM Exploration Company Inc. | | Oil & Gas Operator | Apr 2009 |
| 151 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 2025 |
| 152 | Cola Resources LLC | Houston, TX 77019-5639 | Gas Operator | Nov 2015 |
| 153 | Columbus Oil Company | Seminole, OK 74868 | Oil & Gas Operator | Jul 2025 |
| 154 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 155 | Concorde Resources Corporation | Eufaula, OK 74432 | Oil & Gas Operator | May 2025 |
| 156 | Confederate Spooling Inc | Okemah, OK 74859-2409 | Oil & Gas Operator | Apr 2020 |
| 157 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 158 | Consolidated Resources Corp | Shawnee, OK 74801 | Oil & Gas Operator | Sep 2014 |
| 159 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Nov 2024 |
| 160 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 161 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Sep 2025 |
| 162 | Cook Oil Company | Wewoka, OK 74884 | Oil & Gas Operator | Sep 2015 |
| 163 | Cook William Glenn | Wewoka, OK 74884-0727 | Oil & Gas Operator | Nov 2000 |
| 164 | Cornerstone E & P Company LP | Irving, TX 75038 | Oil & Gas Operator | Nov 2010 |
| 165 | Corterra Energy Operating LLC | Tulsa, OK 74119-4844 | Oil & Gas Operator | Aug 2021 |
| 166 | Cougar Energy Investment LLC | Spring, TX 77387-7277 | Oil & Gas Operator | Sep 2014 |
| 167 | Cox Edwin L & R Berry | Dallas, TX 75202 | Oil & Gas Operator | Apr 2015 |
| 168 | Cox Elmer N | Irving, TX 75181 | Oil Operator | Aug 2013 |
| 169 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 170 | Creede Oil & Gas Company | Oklahoma City, OK 73102-7502 | Oil & Gas Operator | Jun 2006 |
| 171 | Criswell Energy LLC | Montezuma, IA 50171-8500 | Oil & Gas Operator | Oct 2022 |
| 172 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 173 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Jun 2025 |
| 174 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 175 | Crystal Energy Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2019 |
| 176 | Cudd Operating Corp. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 177 | Cuesta Petroleum Inc | Shawnee, OK 74801-6963 | Oil & Gas Operator | Jun 2025 |
| 178 | Culbreath Oil & Gas Company, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 179 | Culp & Copple Oil Company | Cushing, OK 74023 | Oil & Gas Operator | Jun 2025 |
| 180 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jun 2025 |
| 181 | Cyanostar Energy, Inc | Tulsa, OK 74103-4122 | Oil & Gas Operator | Sep 2001 |
| 182 | Cypress Exploration Company | Tulsa, OK 74132 | Oil & Gas Operator | Jun 2025 |
| 183 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Sep 2025 |
| 184 | D.J.F. Services, Inc. | Holdenville, OK 74848 | Oil & Gas Operator | Sep 2025 |
| 185 | Dahl SWD Facility #1 LLC | Oklahoma City, OK 73013 | Gas Operator | Dec 2017 |
| 186 | Davco Productions Inc | Springer, OK 73458-8191 | Oil & Gas Operator | Jun 2021 |
| 187 | David Ridley Oil LLC | Tecumseh, OK 74873 | Oil Operator | Jun 2025 |
| 188 | Davis & Hamilton Oil Company | Edmond, OK 73083-3670 | Oil Operator | Aug 2022 |
| 189 | Davis Henry | Tulsa, OK 74135-3567 | Oil & Gas Operator | Dec 1994 |
| 190 | Davis Jared | Wann, OK 74083-9610 | Oil & Gas Operator | Jun 2025 |
| 191 | Davis Operating Company | Elysian Field, TX 75642 | Oil & Gas Operator | Sep 2025 |
| 192 | Davis, Joe D. | Fort Smith, AR 72903 | Gas Operator | Mar 2015 |
| 193 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 194 | Dead Fern Resources Inc | Sperry, OK 74073 | Oil & Gas Operator | Jul 2025 |
| 195 | Deck Exploration Inc | Perry, OK 73077-0303 | Oil & Gas Operator | May 2013 |
| 196 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 197 | Degge Oil Field Service | Okemah, OK 74859-0269 | Oil Operator | Nov 2014 |
| 198 | Dehart Company (The) | Ardmore, OK 73402 | Oil & Gas Operator | Jul 2025 |
| 199 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Jun 2025 |
| 200 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |