| 101 | C.D. Operating Company, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 102 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 103 | Cabot Petroleum Corporation | Englewood, CO 80111-2529 | Oil & Gas Operator | Dec 2004 |
| 104 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 105 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 106 | Canaan Resources X LLC | Oklahoma City, OK 73103-4925 | Oil & Gas Operator | Sep 2024 |
| 107 | Canard Colvert Operating LLC | Dallas, TX 75219-6243 | Oil & Gas Operator | May 2025 |
| 108 | Cane Creek Energy Partners Inc | Morris, OK 74445 | Oil & Gas Operator | Apr 2025 |
| 109 | Canvas Energy LLC | Oklahoma City, OK 73142-1839 | Oil & Gas Operator | May 2025 |
| 110 | Capstone Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2025 |
| 111 | Carbon Economy LLC | Chickasha, OK 73023 | Oil & Gas Operator | May 2025 |
| 112 | Carbon Ridge Energy LLC | Norman, OK 73069 | Oil & Gas Operator | Apr 2025 |
| 113 | Carl Humphries Inc | Piedmont, OK 73078-0514 | Oil & Gas Operator | May 2025 |
| 114 | Carmen Field LP | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2008 |
| 115 | Carrera Energy LLC | Midland, TX 79704-5036 | Oil & Gas Operator | Apr 2025 |
| 116 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 117 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 118 | CBS Energy LLC | Oklahoma City, OK 73142-4437 | Oil & Gas Operator | May 2025 |
| 119 | CDS Oil Company | Tulsa, OK 74147-1514 | Oil & Gas Operator | Mar 2015 |
| 120 | Centurion Oil Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 1992 |
| 121 | Cep Mid-Continent LLC | Skiatook, OK 74070 | Oil & Gas Operator | Apr 2025 |
| 122 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | May 2025 |
| 123 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | May 2025 |
| 124 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2025 |
| 125 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 126 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Jul 2025 |
| 127 | Chisholm Oil And Gas Operating LLC | Tulsa, OK 74103-3522 | Oil & Gas Operator | May 2025 |
| 128 | Choctaw Gas Company | Quinton, OK 74561 | Gas Operator | Apr 2025 |
| 129 | Christie Jr C B | Wichita Falls, TX 76308-4873 | Oil & Gas Operator | May 2024 |
| 130 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 131 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 132 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 133 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Apr 2025 |
| 134 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 135 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 136 | Claybrook Production Co. Inc. | Wewoka, OK 74884-1380 | Oil & Gas Operator | Jun 2014 |
| 137 | Clifford Resources Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | Jul 2015 |
| 138 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 139 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 140 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 141 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 142 | Comanche Exploration Co LLC | Oklahoma City, OK 73116-7334 | Oil & Gas Operator | May 2025 |
| 143 | Comanche Exploration Company | Oklahoma City, OK 73120-2797 | Oil & Gas Operator | Feb 2007 |
| 144 | Comanche Production Co | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 145 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | May 2025 |
| 146 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2025 |
| 147 | Compass Drilling Inc | Enid, OK 73702-5467 | Oil & Gas Operator | Sep 2014 |
| 148 | Complete Energy Services LLC | Gainesville, TX 76240 | Oil Operator | Aug 2022 |
| 149 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 150 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 151 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 152 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 153 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 154 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Jul 2025 |
| 155 | Continental Exploration LLC | Richardson, TX 75080 | Oil & Gas Operator | Jul 2025 |
| 156 | Continental Gas Inc | Enid, OK 73702-5103 | Oil & Gas Operator | Apr 2012 |
| 157 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 158 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Jul 2025 |
| 159 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 160 | Cooper Energy Corp | | Oil & Gas Operator | Jun 1995 |
| 161 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2025 |
| 162 | Cordillera Energy Partners II LLC | Greenwood VIllage, CO 80111-2856 | Oil & Gas Operator | Apr 2025 |
| 163 | Cordillera Energy Partners LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 164 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 165 | Council Oak Resources LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Apr 2025 |
| 166 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 167 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 168 | CRB Resources Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2025 |
| 169 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 170 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 171 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 172 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 173 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 174 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 175 | Cudd Operating Corp. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 176 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Apr 2025 |
| 177 | CX Disposals LLC | Minco, OK 73059-9472 | Oil Operator | May 2025 |
| 178 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 179 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Jul 2025 |
| 180 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 181 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 182 | Davco Productions Inc | Springer, OK 73458-8191 | Oil & Gas Operator | Jun 2021 |
| 183 | Davis Operating Company | Elysian Field, TX 75642 | Oil & Gas Operator | Jul 2025 |
| 184 | Davis William H | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 185 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2025 |
| 186 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 187 | Dee-Jay Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Jul 2025 |
| 188 | Derby Exploration LLC | Okc, OK 73102 | Oil & Gas Operator | May 2025 |
| 189 | Destin Corporation | Enid, OK 73702-2403 | Oil & Gas Operator | Mar 2005 |
| 190 | Dette Oil Corporation | Oklahoma City, OK 73162-6249 | Oil & Gas Operator | Oct 2015 |
| 191 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 192 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 193 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 194 | Dexxon, Inc. | Kiefer, OK 74041 | Oil & Gas Operator | Apr 2025 |
| 195 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Jul 2025 |
| 196 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 197 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 198 | Dominion Exp Midcontinent Inc | Oklahoma City, OK 73134-2616 | Oil & Gas Operator | Oct 2024 |
| 199 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 200 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |