| 101 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 102 | Brenneis Energy | Duncan, OK 73533-5415 | Oil & Gas Operator | Mar 2025 |
| 103 | Brenneis Oil Company | Norman, OK 73072-3963 | Oil & Gas Operator | Aug 2012 |
| 104 | Brent Baker Oil And Gas Inc | Oklahoma City, OK 73149-2932 | Oil & Gas Operator | May 2025 |
| 105 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 106 | BRG Petroleum LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 107 | BRG Production Company | Tulsa, OK 74136-6338 | Oil & Gas Operator | May 2025 |
| 108 | Bricktown Energy LLC | Oklahoma City, OK 73112-5468 | Oil & Gas Operator | Mar 2025 |
| 109 | Bridwell Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 110 | Brighton Energy LLC | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 111 | Briscoe Oil Operating Co., Inc. | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2015 |
| 112 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 113 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 114 | Bruce Weldon | Lawton, OK 73501-5707 | Oil & Gas Operator | Mar 2000 |
| 115 | Brundred Petroleum Inc | | Oil & Gas Operator | Nov 1992 |
| 116 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 117 | Bullseye Operating LLC | Bartlesville, OK 74005 | Oil & Gas Operator | Apr 2025 |
| 118 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 119 | Buttonwood Petroleum Inc | Tulsa, OK 74136-4234 | Oil & Gas Operator | Jan 2014 |
| 120 | Buxton Fred M | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Feb 2007 |
| 121 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | May 2025 |
| 122 | C E D LC | Enid, OK 73702-0326 | Oil & Gas Operator | Oct 2021 |
| 123 | C E Harmon Oil Inc | Tulsa, OK 74136-6559 | Oil & Gas Operator | May 2025 |
| 124 | C F & L Producing Co | | Oil & Gas Operator | Sep 2000 |
| 125 | C.D. Operating Company, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 126 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 127 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 128 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 129 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 130 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 131 | Canaan Resources X LLC | Oklahoma City, OK 73103-4925 | Oil & Gas Operator | Sep 2024 |
| 132 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | May 2025 |
| 133 | Canyon Creek Energy Arkoma LLC | Tulsa, OK 74120-3017 | Oil & Gas Operator | Apr 2025 |
| 134 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2025 |
| 135 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | May 2025 |
| 136 | Carl E Gungoll Exploration Inc | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Jan 2016 |
| 137 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 138 | Carl Humphries Inc | Piedmont, OK 73078-0514 | Oil & Gas Operator | May 2025 |
| 139 | Casillas Operating LLC | Tulsa, OK 74103-4060 | Oil & Gas Operator | Apr 2025 |
| 140 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | May 2025 |
| 141 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 142 | Caulkins Oil Company | Aztec, NM 87410 | Oil & Gas Operator | Oct 2024 |
| 143 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | Jul 2025 |
| 144 | Cement Oil Company | Cement, OK 73017-9234 | Oil & Gas Operator | May 2025 |
| 145 | Cemoil Inc | Cement, OK 73017-0563 | Oil & Gas Operator | May 2025 |
| 146 | CFC Oil Inc | Cyril, OK 73029-5601 | Oil & Gas Operator | May 2025 |
| 147 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | May 2025 |
| 148 | Chambers Jerry Expl Co | | Oil & Gas Operator | Sep 2000 |
| 149 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | May 2025 |
| 150 | Chaney & Cogburn Roustabout Well Serv | Cement, OK 73017-0267 | Oil & Gas Operator | Mar 2015 |
| 151 | Chapman Energy Oklahoma, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 152 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2025 |
| 153 | Chermac Energy Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2020 |
| 154 | Chesapeake Exploration LLC | Oklahoma City, OK 731540496 | Oil & Gas Operator | Jul 2020 |
| 155 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2025 |
| 156 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 157 | Choctaw Gas Company | Quinton, OK 74561 | Gas Operator | Apr 2025 |
| 158 | Christie Jr C B | Wichita Falls, TX 76308-4873 | Oil & Gas Operator | May 2024 |
| 159 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 160 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 161 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 162 | Citadel Production Company, Inc. | Denver, CO 80201 | Oil Operator | Sep 1996 |
| 163 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Jul 2025 |
| 164 | Cities Services Company | | Oil & Gas Operator | Mar 2008 |
| 165 | Citizen Energy II LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Apr 2025 |
| 166 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 167 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 168 | Clift Cary E | Chickasha, OK 73018-6305 | Oil & Gas Operator | Sep 2024 |
| 169 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 170 | Cobalt Environmental Solutions LLC | Oklahoma City, OK 73101-0249 | Oil Operator | Jun 2019 |
| 171 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 172 | Coleman Oil LLC | Marlow, OK 73055 | Oil Operator | Nov 2021 |
| 173 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 174 | Columbia Production Company | Edmond, OK 73083 | Oil & Gas Operator | May 2020 |
| 175 | Columbus Oil Company | Seminole, OK 74868 | Oil & Gas Operator | May 2025 |
| 176 | Comanche Exploration Company | Oklahoma City, OK 73120-2797 | Oil & Gas Operator | Feb 2007 |
| 177 | Comanche Production Co | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 178 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2025 |
| 179 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 180 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 181 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 182 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 183 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Jul 2025 |
| 184 | Continental Exploration LLC | Richardson, TX 75080 | Oil & Gas Operator | Jul 2025 |
| 185 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Nov 2024 |
| 186 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 187 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jul 2025 |
| 188 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2025 |
| 189 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Apr 2025 |
| 190 | Cordillera Energy Partners III LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Mar 2014 |
| 191 | Cordillera Energy Partners LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 192 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 193 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 194 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 195 | Cox Robert L | Blackwell, OK 74631 | Oil & Gas Operator | Mar 2025 |
| 196 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 197 | CPRP Services LLC | Oklahoma City, OK 73102-5804 | Oil & Gas Operator | Apr 2025 |
| 198 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 199 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 200 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Apr 2025 |